Flexible single carrier waveform

文档序号：411890 发布日期：2021-12-17 浏览：2次中文

阅读说明：本技术 灵活的单载波波形 (Flexible single carrier waveform ) 是由张晓霞 S·耶拉玛利 Z·范骆涛 J·孙于 2020-04-29 设计创作，主要内容包括：描述了用于无线通信的方法、系统和设备以使得用户装备(UE)或基站能够使用单载波(SC)传输配置来传送和接收(例如,对应于上行链路或下行链路传输的)SC波形。在一些情形中,UE和基站可以采用SC配置来标识针对上行链路或下行链路SC信号的资源元素(RE)。附加地或替换地,UE和基站可以采用具有不同循环前缀(CP)长度的SC配置以便改变可被分配用于SC传输的RE的基本数量,其中不同的CP长度可以是静态的或动态的。基站可以向UE传送SC配置的指示,并且UE和基站可以根据所指示的SC配置来处理对应的SC下行链路或上行链路通信。(Methods, systems, and devices are described for wireless communication to enable a User Equipment (UE) or a base station to transmit and receive Single Carrier (SC) waveforms (e.g., corresponding to uplink or downlink transmissions) using a SC transmission configuration. In some cases, the UE and the base station may employ SC configurations to identify Resource Elements (REs) for uplink or downlink SC signals. Additionally or alternatively, the UE and the base station may employ SC configurations with different Cyclic Prefix (CP) lengths in order to change the basic number of REs that may be allocated for SC transmission, where the different CP lengths may be static or dynamic. The base station may transmit an indication of the SC configuration to the UE, and the UE and the base station may process corresponding SC downlink or uplink communications according to the indicated SC configuration.)

1. A method for wireless communication at a transmitting device, comprising:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a receiving device;

allocating a set of resource elements in the set of resource blocks based at least in part on the transmission configuration, wherein a number of the set of resource elements is less than a total number of resource elements in the set of resource blocks; and

transmitting the single-carrier waveform to the receiving device via the set of resource elements.

2. The method of claim 1, further comprising:

identifying a mapping configuration for mapping data associated with the single-carrier waveform to the set of resource elements based at least in part on the transmission configuration; and

mapping data associated with the single-carrier waveform to the set of resource elements in accordance with the mapping configuration.

3. The method of claim 2, wherein mapping the data comprises:

mapping data beginning with a first resource element, an intermediate resource element, or a last resource element of the set of resource elements based at least in part on the mapping configuration and a respective position of each resource element of the set of resource elements, wherein the data is mapped such that at least one resource element of the set of resource elements is unoccupied.

4. The method of claim 2, further comprising:

receiving an indication of the mapping configuration in a message from the recipient device, the message including the transmission configuration.

5. The method of claim 1, further comprising:

transmitting an indication of the transmission configuration to the receiving device via Radio Resource Control (RRC) signaling or Downlink Control Information (DCI).

6. The method of claim 1, further comprising:

receive a message from the receiver device indicating a transmission configuration for the single-carrier waveform based at least in part on a Resource Element Identifier (REID) included in the message, wherein the REID is based at least in part on a cell Identifier (ID) of a cell used for communication between the transmitter device and the receiver device.

7. The method of claim 1, further comprising:

determining a demodulation reference signal (DMRS) pattern, a DMRS length, or a Transport Block Size (TBS) associated with the single-carrier waveform based at least in part on the set of resource elements or the number of sets of resource elements.

8. The method of claim 1, further comprising:

determining a Cyclic Prefix (CP) configuration for the single-carrier waveform based at least in part on the transmission configuration, wherein the CP configuration indicates a first CP ratio for an initial symbol of the single-carrier waveform and a second CP ratio, different from the first CP ratio, for one or more symbols of the single-carrier waveform subsequent to the initial symbol.

9. The method of claim 8, further comprising:

determining the first and second CP ratios based at least in part on a subcarrier spacing associated with the single carrier waveform;

generating a first CP for the initial symbol based at least in part on the first CP ratio; and

generating at least one additional CP for the one or more symbols subsequent to the initial symbol based at least in part on the second CP ratio, wherein the second CP ratio is less than the first CP ratio.

10. The method of claim 9, further comprising:

transmitting the single-carrier waveform including the first CP and the at least one additional CP to the receiver device.

11. The method of claim 9, wherein the number of samples of the first CP and the number of samples of the at least one additional CP are based at least in part on the subcarrier spacing.

12. The method of claim 8, further comprising:

determining the first and second CP ratios based at least in part on a bandwidth portion associated with the single-carrier waveform;

generating a first CP for the initial symbol based at least in part on the first CP ratio; and

13. The method of claim 12, wherein a number of samples of the first CP and a number of samples of the at least one additional CP are based at least in part on a number of the set of resource blocks of the bandwidth portion.

14. The method of claim 12, further comprising:

transmitting the single-carrier waveform including the first CP and the at least one additional CP to the receiver device.

15. A method for wireless communication at a recipient device, comprising:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a transmitting device;

determining a set of resource elements in the set of resource blocks for the single-carrier waveform based at least in part on the transmission configuration, wherein a number of the set of resource elements is less than a total number of resource elements in the set of resource blocks; and

receiving the single carrier waveform from the transmitting device via the set of resource elements.

16. The method of claim 15, further comprising:

identifying a mapping configuration for mapping data of the single-carrier waveform to the set of resource elements based at least in part on the transmission configuration; and

de-mapping the data of the single-carrier waveform.

17. The method of claim 16, further comprising:

demapping data starting from a first resource element, an intermediate resource element, or a last resource element of the set of resource elements based at least in part on the mapping configuration and a respective position of each resource element of the set of resource elements, wherein the data is mapped such that at least one resource element of the set of resource elements is unoccupied.

18. The method of claim 16, further comprising:

receiving an indication of the mapping configuration in a message from the transmitting device, the message comprising the transmission configuration.

19. The method of claim 15, further comprising:

receiving an indication of the transmission configuration from the transmitting device via Radio Resource Control (RRC) signaling or Downlink Control Information (DCI).

20. The method of claim 15, further comprising:

transmitting a message to the transmitting device indicating a transmission configuration for the single-carrier waveform based at least in part on a Resource Element Identifier (REID) included in the message, wherein the REID is based at least in part on a cell Identifier (ID) of a cell used for communication between the transmitting device and the receiving device.

21. The method of claim 15, further comprising:

22. The method of claim 15, further comprising:

23. The method of claim 22, further comprising:

determining the first and second CP ratios based at least in part on a subcarrier spacing associated with the single carrier waveform;

identifying a first CP of the initial symbols based at least in part on the first CP ratio; and

identifying at least one additional CP for the one or more symbols after the initial symbol based at least in part on the second CP ratio, wherein the second CP ratio is less than the first CP ratio.

24. The method of claim 23, further comprising:

receiving the single-carrier waveform including the first CP and the at least one additional CP from the transmitting device.

25. The method of claim 23, wherein the number of samples of the first CP and the number of samples of the at least one additional CP are based at least in part on the subcarrier spacing.

26. The method of claim 22, further comprising:

determining the first and second CP ratios based at least in part on a bandwidth portion associated with the single-carrier waveform;

identifying a first CP of the initial symbols based at least in part on the first CP ratio; and

identifying at least one additional CP for the one or more symbols after the initial symbol based at least in part on the second CP ratio, wherein the second CP ratio is less than the first CP ratio.

27. The method of claim 26, wherein a number of samples of the first CP and a number of samples of the at least one additional CP are based at least in part on a number of the set of resource blocks of the bandwidth portion.

28. The method of claim 26, further comprising:

receiving the single-carrier waveform including the first CP and the at least one additional CP from the transmitting device.

29. A method for wireless communication at a transmitting device, comprising:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a receiving device and a cyclic prefix ratio of a cyclic prefix of the single carrier waveform;

allocating a set of resource elements in the set of resource blocks for the single-carrier waveform including the cyclic prefix based at least in part on the transmission configuration and the cyclic prefix ratio; and

transmitting the single-carrier waveform including the cyclic prefix to the receiver device via the set of resource elements in accordance with the cyclic prefix ratio.

30. The method of claim 29, further comprising:

31. The method of claim 30, further comprising:

determining the first and second CP ratios based at least in part on a subcarrier spacing associated with the single carrier waveform;

generating a first CP for the initial symbol based at least in part on the first CP ratio; and

32. The method of claim 31, further comprising:

transmitting the single-carrier waveform including the first CP and the at least one additional CP to the receiver device.

33. The method of claim 31, wherein the number of samples of the first CP and the number of samples of the at least one additional CP are based at least in part on the subcarrier spacing.

34. The method of claim 30, further comprising:

determining the first and second CP ratios based at least in part on a bandwidth portion associated with the single-carrier waveform;

generating a first CP for the initial symbol based at least in part on the first CP ratio; and

35. The method of claim 34, wherein a number of samples of the first CP and a number of samples of the at least one additional CP are based at least in part on a number of the set of resource blocks of the bandwidth portion.

36. The method of claim 34, further comprising:

transmitting the single-carrier waveform including the first CP and the at least one additional CP to the receiver device.

37. A method for wireless communication at a recipient device, comprising:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a transmitting device and a cyclic prefix ratio of a cyclic prefix of the single carrier waveform;

determining a set of resource elements in the set of resource blocks for the single-carrier waveform including the cyclic prefix based at least in part on the transmission configuration and the cyclic prefix ratio; and

receiving the single-carrier waveform including the cyclic prefix from the transmitting device via the set of resource elements according to the cyclic prefix ratio.

38. The method of claim 37, further comprising:

39. The method of claim 38, further comprising:

determining the first and second CP ratios based at least in part on a subcarrier spacing associated with the single carrier waveform;

identifying a first CP of the initial symbols based at least in part on the first CP ratio; and

identifying at least one additional CP for the one or more symbols after the initial symbol based at least in part on the second CP ratio, wherein the second CP ratio is less than the first CP ratio.

40. The method of claim 39, further comprising:

receiving the single-carrier waveform including the first CP and the at least one additional CP from the transmitting device.

41. The method of claim 39, wherein a number of samples of the first CP and a number of samples of the at least one additional CP are based at least in part on the subcarrier spacing.

42. The method of claim 38, further comprising:

determining the first and second CP ratios based at least in part on a bandwidth portion associated with the single-carrier waveform;

identifying a first CP of the initial symbols based at least in part on the first CP ratio; and

identifying at least one additional CP for the one or more symbols after the initial symbol based at least in part on the second CP ratio, wherein the second CP ratio is less than the first CP ratio.

43. The method of claim 42, wherein a number of samples of the first CP and a number of samples of the at least one additional CP are based at least in part on a number of the set of resource blocks of the portion of bandwidth.

44. The method of claim 42, further comprising:

receiving the single-carrier waveform including the first CP and the at least one additional CP from the transmitting device.

45. An apparatus for wireless communication at a transmitting device, comprising:

a processor;

a memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a receiving device;

transmitting the single-carrier waveform to the receiving device via the set of resource elements.

46. An apparatus for wireless communication at a recipient device, comprising:

a processor;

a memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a transmitting device;

receiving the single carrier waveform from the transmitting device via the set of resource elements.

47. An apparatus for wireless communication at a transmitting device, comprising:

a processor;

a memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmitting the single-carrier waveform including the cyclic prefix to the receiver device via the set of resource elements in accordance with the cyclic prefix ratio.

48. An apparatus for wireless communication at a recipient device, comprising:

a processor;

a memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a transmitting device and a cyclic prefix ratio of a cyclic prefix of the single carrier waveform;

receiving the single-carrier waveform including the cyclic prefix from the transmitting device via the set of resource elements according to the cyclic prefix ratio.

49. An apparatus for wireless communication at a transmitting device, comprising:

means for identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a receiving device;

means for allocating a set of resource elements in the set of resource blocks based at least in part on the transmission configuration, wherein a number of the set of resource elements is less than a total number of resource elements in the set of resource blocks; and

means for transmitting the single carrier waveform to the receiving device via the set of resource elements.

50. An apparatus for wireless communication at a recipient device, comprising:

means for determining a set of resource elements in the set of resource blocks for the single-carrier waveform based at least in part on the transmission configuration, wherein a number of the set of resource elements is less than a total number of resource elements in the set of resource blocks; and

means for receiving the single carrier waveform from the transmitting device via the set of resource elements.

51. An apparatus for wireless communication at a transmitting device, comprising:

means for allocating a set of resource elements in the set of resource blocks for the single-carrier waveform including the cyclic prefix based at least in part on the transmission configuration and the cyclic prefix ratio; and

means for transmitting the single-carrier waveform including the cyclic prefix to the receiver device via the set of resource elements in accordance with the cyclic prefix ratio.

52. An apparatus for wireless communication at a recipient device, comprising:

means for determining a set of resource elements in the set of resource blocks for the single-carrier waveform including the cyclic prefix based at least in part on the transmission configuration and the cyclic prefix ratio; and

means for receiving the single carrier waveform comprising the cyclic prefix from the transmitting device via the set of resource elements according to the cyclic prefix ratio.

53. A non-transitory computer-readable medium storing code for wireless communication at a transmitting device, the code comprising instructions executable by a processor to:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a receiving device;

transmitting the single-carrier waveform to the receiving device via the set of resource elements.

54. A non-transitory computer-readable medium storing code for wireless communication at a recipient device, the code comprising instructions executable by a processor to:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a transmitting device;

receiving the single carrier waveform from the transmitting device via the set of resource elements.

55. A non-transitory computer-readable medium storing code for wireless communication at a transmitting device, the code comprising instructions executable by a processor to:

transmitting the single-carrier waveform including the cyclic prefix to the receiver device via the set of resource elements in accordance with the cyclic prefix ratio.

56. A non-transitory computer-readable medium storing code for wireless communication at a recipient device, the code comprising instructions executable by a processor to:

identifying a transmission configuration for a single carrier waveform, the transmission configuration indicating a set of resource blocks allocated for communication with a transmitting device and a cyclic prefix ratio of a cyclic prefix of the single carrier waveform;

receiving the single-carrier waveform including the cyclic prefix from the transmitting device via the set of resource elements according to the cyclic prefix ratio.

Background

The following relates generally to wireless communications and more particularly to flexible single carrier waveforms.

Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be able to support communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems, such as Long Term Evolution (LTE) systems, LTE-advanced (LTE-a) systems, or LTE-a Pro systems, and fifth generation (5G) systems that may be referred to as New Radio (NR) systems. These systems may employ various techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), orthogonal FDMA (ofdma), or discrete fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communication system may include several base stations or network access nodes, each supporting communication for multiple communication devices simultaneously, which may otherwise be referred to as User Equipment (UE).

Disclosure of Invention

The described technology relates to improved methods, systems, devices, and apparatus that support flexible Single Carrier (SC) waveforms. In general, the described techniques provide for enabling a User Equipment (UE) or a base station to transmit and receive SC waveforms (e.g., corresponding to uplink or downlink transmissions) using an SC transmission configuration. A transmitting UE or base station (e.g., transmitting wireless device) may transmit an uplink or downlink communication in accordance with the identified SC transmission configuration, and a receiving UE or base station (e.g., receiving wireless device) may receive the uplink or downlink communication in accordance with the identified SC transmission configuration. In some cases, the UE and base station may employ SC configurations to identify Resource Elements (REs) (e.g., within a set of Resource Blocks (RBs)) to be allocated for uplink or downlink SC signals (e.g., because not all REs within an RB allocation may be used for transmission). Additionally or alternatively, the UE and the base station may employ SC configurations with different Cyclic Prefix (CP) lengths to adjust the number of REs allocated for SC transmission, where the different CP lengths may be static or dynamic. In an example, the base station may transmit an indication of the SC configuration to the UE via a configuration indication in a control message (e.g., via a Radio Resource Control (RRC) message, Downlink Control Information (DCI), etc.). The UE may receive and decode the control message and may identify the SC transmission configuration. The UE and base station may implement the SC transmission configuration to receive or transmit SC downlink or uplink communications.

A method of wireless communication at a transmitting device is described. The method can comprise the following steps: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a receiving device, allocating a set of REs in the set of RBs based on the transmission configuration for an SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and transmitting the SC waveform to the receiving device via the set of REs.

An apparatus for wireless communication at a transmitting device is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a receiving device, allocating a set of REs in the set of RBs based on the transmission configuration for an SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and transmitting the SC waveform to the receiving device via the set of REs.

Another apparatus for wireless communication at a transmitting device is described. The apparatus may include means for: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a receiving device, allocating a set of REs in the set of RBs based on the transmission configuration for an SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and transmitting the SC waveform to the receiving device via the set of REs.

A non-transitory computer-readable medium storing code for wireless communication at a transmitting device is described. The code may include instructions executable by a processor for: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a receiving device, allocating a set of REs in the set of RBs based on the transmission configuration for an SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and transmitting the SC waveform to the receiving device via the set of REs.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a mapping configuration for mapping data associated with the SC waveform to a set of REs is identified based on the transmission configuration, and the data associated with the SC waveform is mapped to the set of REs according to the mapping configuration.

In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the mapping data may include operations, features, devices, or instructions for: data starting from a first RE, an intermediate RE, or a last RE of the RE set is mapped based on the mapping configuration and a respective location of each RE in the RE set.

In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, data may be mapped such that at least one RE in the set of REs may be unoccupied.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: an indication of the mapping configuration is received in a message from a recipient device, the message including the transmission configuration.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a message is received from a recipient device indicating a transmission configuration for the SC waveform based on an RE identifier (REID) included in the message.

In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the REID may be based on a cell Identifier (ID) of a cell used for communication between the transmitting device and the receiving device.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a demodulation reference signal (DMRS) pattern, DMRS length, or Transport Block Size (TBS) associated with the SC waveform is determined based on the RE set or the number of RE sets.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a CP configuration for the SC waveform is determined based on the transmission configuration, where the CP configuration indicates a first CP ratio of an initial symbol of the SC waveform and a second CP ratio of one or more symbols of the SC waveform following the initial symbol that is different from the first CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a subcarrier spacing associated with the SC waveform, generating a first CP for an initial symbol based on the first CP ratio, and generating at least one additional CP for the one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the number of samples of the first CP and the number of samples of the at least one additional CP may be based on the subcarrier spacing.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a bandwidth portion (BWP) associated with the SC waveform, generating a first CP for an initial symbol based on the first CP ratio, and generating at least one additional CP for the one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

A method of wireless communication at a recipient device is described. The method can comprise the following steps: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of sets of REs is less than a total number of REs in the set of RBs, and receiving the SC waveform from the transmitting device via the set of REs.

An apparatus for wireless communication at a recipient device is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of sets of REs is less than a total number of REs in the set of RBs, and receiving the SC waveform from the transmitting device via the set of REs.

Another apparatus for wireless communication at a recipient device is described. The apparatus may include means for: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of sets of REs is less than a total number of REs in the set of RBs, and receiving the SC waveform from the transmitting device via the set of REs.

A non-transitory computer-readable medium storing code for wireless communication at a recipient device is described. The code may include instructions executable by a processor for: the method generally includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of sets of REs is less than a total number of REs in the set of RBs, and receiving the SC waveform from the transmitting device via the set of REs.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a mapping configuration for data of the SC waveform mapped to the set of REs is identified based on the transmission configuration, and the data of the SC waveform is demapped.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: data starting from a first RE, an intermediate RE, or a last RE of the set of REs is demapped based on the mapping configuration and a respective location of each RE in the set of REs.

In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, data may be mapped such that at least one RE in the set of REs may be unoccupied.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: receiving an indication of the mapping configuration in a message from a transmitting device, the message including the transmission configuration.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: transmitting a message to a transmitting device indicating a transmission configuration for the SC waveform based on a REID included in the message.

In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the REID may be based on a cell ID of a cell used for communication between the transmitting device and the receiving device.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a CP configuration for the SC waveform is determined based on the transmission configuration, wherein the CP configuration indicates a first CP ratio of an initial symbol of the SC waveform and a second CP ratio, different from the first CP ratio, of one or more symbols following the initial symbol of the SC waveform.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a subcarrier spacing associated with the SC waveform, identifying a first CP for an initial symbol based on the first CP ratio, and identifying at least one additional CP for the one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a BWP associated with the SC waveform, identifying a first CP for an initial symbol based on the first CP ratio, and identifying at least one additional CP for one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

A method of wireless communication at a transmitting device is described. The method can comprise the following steps: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a recipient device, allocating a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and transmitting the SC waveform including the CP to the recipient device via the set of REs according to the CP ratio.

An apparatus for wireless communication at a transmitting device is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a recipient device, allocating a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and transmitting the SC waveform including the CP to the recipient device via the set of REs according to the CP ratio.

Another apparatus for wireless communication at a transmitting device is described. The apparatus may include means for: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a recipient device, allocating a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and transmitting the SC waveform including the CP to the recipient device via the set of REs according to the CP ratio.

A non-transitory computer-readable medium storing code for wireless communication at a transmitting device is described. The code may include instructions executable by a processor for: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a recipient device, allocating a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and transmitting the SC waveform including the CP to the recipient device via the set of REs according to the CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a CP configuration for the SC waveform is determined based on the transmission configuration, where the CP configuration indicates a first CP ratio of an initial symbol of the SC waveform and a second CP ratio of one or more symbols of the SC waveform following the initial symbol that is different from the first CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a subcarrier spacing associated with the SC waveform, generating a first CP for an initial symbol based on the first CP ratio, and generating at least one additional CP for the one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the number of samples of the first CP and the number of samples of the at least one additional CP may be based on a subcarrier spacing.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a BWP associated with the SC waveform, generating a first CP for an initial symbol based on the first CP ratio, and generating at least one additional CP for the one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

A method of wireless communication at a recipient device is described. The method can comprise the following steps: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receiving the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

An apparatus for wireless communication at a recipient device is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receiving the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

Another apparatus for wireless communication at a recipient device is described. The apparatus may include means for: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receiving the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

A non-transitory computer-readable medium storing code for wireless communication at a recipient device is described. The code may include instructions executable by a processor for: the method includes identifying a transmission configuration for an SC waveform, the transmission configuration indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a transmitting device, determining a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receiving the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: a CP configuration for the SC waveform is determined based on the transmission configuration, where the CP configuration indicates a first CP ratio of an initial symbol of the SC waveform and a second CP ratio of one or more symbols of the SC waveform following the initial symbol that is different from the first CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a subcarrier spacing associated with the SC waveform, identifying a first CP for an initial symbol based on the first CP ratio, and identifying at least one additional CP for the one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions to: the method may include determining a first CP ratio and a second CP ratio based on a BWP associated with the SC waveform, identifying a first CP for an initial symbol based on the first CP ratio, and identifying at least one additional CP for one or more symbols after the initial symbol based on the second CP ratio, wherein the second CP ratio may be less than the first CP ratio.

Brief Description of Drawings

Fig. 1 illustrates an example of a wireless communication system supporting flexible Single Carrier (SC) waveforms in accordance with aspects of the present disclosure.

Fig. 2 illustrates an example of a wireless communication system supporting flexible SC waveforms, in accordance with aspects of the present disclosure.

Fig. 3 illustrates an example of a Resource Block (RB) scheme supporting flexible SC waveforms, according to aspects of the present disclosure.

Fig. 4A and 4B illustrate an example of a signal processing flow supporting flexible SC waveforms according to aspects of the present disclosure.

Fig. 5A and 5B illustrate examples of Cyclic Prefix (CP) schemes supporting flexible SC waveforms, according to aspects of the present disclosure.

Fig. 6 illustrates an example of a process flow to support flexible SC waveforms in accordance with aspects of the present disclosure.

Fig. 7 and 8 show block diagrams of apparatuses supporting flexible SC waveforms according to aspects of the present disclosure.

Fig. 9 illustrates a block diagram of a communication manager supporting flexible SC waveforms, in accordance with aspects of the present disclosure.

Fig. 10 shows a diagram of a system including a User Equipment (UE) supporting flexible SC waveforms, in accordance with aspects of the present disclosure.

Fig. 11 shows a diagram of a system including a base station supporting flexible SC waveforms, in accordance with aspects of the present disclosure.

Fig. 12-19 show flow diagrams illustrating methods of supporting flexible SC waveforms according to aspects of the present disclosure.

Detailed Description

Some wireless devices (e.g., User Equipments (UEs) or base stations) may transmit information using Single Carrier (SC) waveforms (e.g., signals) generated using an upsampling and frequency upconversion process (e.g., via an SC transmitter). In some cases, generating the SC signal may also include a Cyclic Prefix (CP) appended to or otherwise included with the information to be transmitted. From the perspective of the receiver, the wireless device may receive information transmitted using the SC signal (e.g., via an SC receiver) using a down-conversion, down-sampling, and equalization (e.g., time-domain or frequency-domain equalization) process. The receiving wireless device may also remove the CP from the transmitted information as part of the reception process. In some examples, the receiving wireless device may implement an SC receiver in the time domain, which may result in lower complexity at the receiver.

Some wireless communication devices may benefit from using SC waveforms for uplink or downlink communications. For example, communications using SC waveforms may have low peak-to-average power ratios (PAPRs) and, in some cases, may be implemented with low complexity at the transmitter and receiver. In an example, a base station can transmit SC downlink communications to a UE, and the UE can implement an SC receiver in the time domain to reduce complexity and increase power savings when receiving the downlink communications. Additionally or alternatively, the UE may transmit SC uplink communications to the base station, and a lower PAPR of SC signaling may increase power savings at the UE.

However, in some cases, the CP used in the SC waveform may limit the frequency resources to a limited set of resources. For example, some SC signals may have a given ratio of CP length to data length, where the ratio may limit the number of input data (e.g., K) or output data (e.g., N) from the SC transmitter to a particular number of Resource Elements (REs) such that the CP may have an integer length. The SC transmitter may be limited to transmitting on a number of REs that is a multiple of the number K, where K may represent half of the greatest common divisor of the CP to data ratio in some cases. In some examples, the K REs may not correspond to an integer number of Resource Blocks (RBs), and the transmitter may therefore determine to transmit on a number of REs that is a multiple of K and also corresponds to an integer number of RBs. Additionally or alternatively, the SC transmitter may determine to transmit on a number of REs that does not correspond to an integer number of RBs.

As such, the UE and base station may employ SC configurations (e.g., SC transmission configurations) to identify REs (e.g., within a set of RBs) allocated for transmitting uplink or downlink SC signals (e.g., because not all REs within an RB allocation may be used). Additionally or alternatively, the UE and base station may employ SC configurations with different CP lengths in order to change the basic amount of REs that may be allocated for SC transmission (e.g., while maintaining the entire number of CPs), where the different CP lengths may be static or dynamic. In some examples, the base station may transmit the indication of the SC configuration via cell signaling or via a control message (e.g., Downlink Control Information (DCI)). Accordingly, the UE may receive the configuration message, may decode the message, and may implement an SC transmitter or SC receiver to process the corresponding SC transmission (e.g., downlink or uplink communications) according to the indicated SC configuration.

Some SC configurations may indicate REs within an RB allocation on which to transmit or receive communications. For example, in some cases, used or occupied REs may span a central portion of the allocated RB, leaving REs at the edges of the allocated RB unoccupied. In other examples, the base station may indicate occupied REs starting from the top edge, bottom edge, center, etc. of the RB allocation. In some cases, the base station may indicate which REs to camp on with RE identifiers (REIDs), which may be a function of cell Identifiers (IDs) of cells supported by the base station in some cases. Additionally or alternatively, the base station may employ SC configurations with different, fixed CP lengths (e.g., CP to data ratios) in order to adjust the number of REs allocated for SC transmissions (e.g., to utilize an integer number of RBs). For example, the base station may specify a new ratio of CP length to data length, resulting in a reduced K value, where a smaller K value may allow finer granularity when allocating a set of RBs.

In some examples, the base station may similarly employ SC configurations with dynamic CP lengths (e.g., CP to data ratios). In some cases, the dynamic CP ratio may change based on the bandwidth used for transmission. When a dynamic CP ratio is used, the total amount of CP samples can be divided evenly across Transmission Time Intervals (TTIs) while folding the margin into the first symbol of the TTI. In some cases, the dynamic CP length may increase the utility of the CP by increasing the length of the smallest CP within the TTI relative to the largest CP within the TTI. In some examples, the dynamic CP length may be implemented when the assigned bandwidth is known or defined and may be used across all UEs within that bandwidth (e.g., to facilitate frequency domain processing).

Aspects of the present disclosure are initially described in the context of a wireless communication system. Aspects related to the RB and CP schemes, the signal processing flow, and the process flow are described later. Aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flowcharts related to flexible SC waveforms.

Fig. 1 illustrates an example of a wireless communication system 100 supporting flexible SC waveforms in accordance with aspects of the present disclosure. The wireless communication system 100 includes base stations 105, UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-advanced (LTE-a) network, an LTE-a Pro network, or a New Radio (NR) network. In some cases, wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low cost and low complexity devices.

The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base stations 105 described herein may include or may be referred to by those skilled in the art as base transceiver stations, radio base stations, access points, radio transceivers, node bs, evolved node bs (enbs), next generation node bs or gigabit node bs (any of which may be referred to as gnbs), home node bs, home evolved node bs, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UEs 115 described herein may be capable of communicating with various types of base stations 105 and network equipment, including macro enbs, small cell enbs, gbbs, relay base stations, and so forth.

Each base station 105 may be associated with a particular geographic coverage area 110, supporting communication with various UEs 115 in that particular geographic coverage area 110. Each base station 105 may provide communication coverage for a respective physical coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communication links 125 shown in the wireless communication system 100 may include uplink transmissions from the UEs 115 to the base stations 105 or downlink transmissions from the base stations 105 to the UEs 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

The geographic coverage area 110 of a base station 105 can be divided into sectors that form a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other type of cell, or various combinations thereof. In some examples, the base stations 105 may be mobile and thus provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

The term "cell" refers to a logical communication entity for communicating with a base station 105 (e.g., on a carrier) and may be associated with an identifier to distinguish between neighboring cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID)) operating via the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., Machine Type Communication (MTC), narrowband internet of things (NB-IoT), enhanced mobile broadband (eMBB), or others) that may provide access for different types of devices. In some cases, the term "cell" may refer to a portion (e.g., a sector) of geographic coverage area 110 over which a logical entity operates.

The UEs 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be stationary or mobile. A UE 115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, station, terminal, or client. The UE 115 may also be a personal electronic device, such as a cellular telephone, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE 115 may also refer to a Wireless Local Loop (WLL) station, an internet of things (IoT) device, an internet of everything (IoE) device, or an MTC device, among others, which may be implemented in various items such as appliances, vehicles, meters, and so forth.

Some UEs 115, such as MTC or IoT devices, may be low cost or low complexity devices and may provide automated communication between machines (e.g., communication via machine-to-machine (M2M)). M2M communication or MTC may refer to data communication techniques that allow devices to communicate with each other or with the base station 105 without human intervention. In some examples, M2M communications or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay the information to a central server or application that may utilize the information or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of a machine. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communications (e.g., a mode that supports unidirectional communication via transmission or reception but does not simultaneously transmit and receive). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for the UE 115 include entering a power saving "deep sleep" mode when not engaged in active communication, or operating on a limited bandwidth (e.g., according to narrowband communication). In some cases, the UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communication for these functions.

In some cases, the UE 115 may also be able to communicate directly with other UEs 115 (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs of the group of UEs 115 communicating with D2D may be within the geographic coverage area 110 of the base station 105. The other UEs 115 in the group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, groups of UEs 115 communicating via D2D may utilize a one-to-many (1: M) system, where each UE 115 transmits to every other UE 115 in the group. In some cases, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base stations 105.

The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 over backhaul links 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other over backhaul links 134 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130).

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an Evolved Packet Core (EPC) that may include at least one Mobility Management Entity (MME), at least one serving gateway (S-GW), and at least one Packet Data Network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be communicated through the S-GW, which may itself be connected to the P-GW. The P-GW may provide IP address allocation as well as other functions. The P-GW may be connected to network operator IP services. The operator IP services may include access to the internet, intranets, IP Multimedia Subsystem (IMS), or Packet Switched (PS) streaming services.

At least some network devices, such as base stations 105, may include subcomponents, such as access network entities, which may be examples of Access Node Controllers (ANCs). Each access network entity may communicate with UEs 115 through a number of other access network transport entities, which may be referred to as radio heads, intelligent radio heads, or Transmission Reception Points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 105).

Wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the 300MHz to 3GHz region is referred to as an Ultra High Frequency (UHF) region or a decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by building and environmental features. However, these waves may penetrate a variety of structures sufficiently for a macro cell to provide service to a UE 115 located indoors. UHF-wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100km) than transmission using smaller and longer waves of the High Frequency (HF) or Very High Frequency (VHF) portions of the spectrum below 300 MHz.

The wireless communication system 100 may also operate in the ultra-high frequency (SHF) region using a frequency band from 3GHz to 30GHz, also referred to as a centimeter frequency band. The SHF region includes frequency bands (such as the 5GHz industrial, scientific, and medical (ISM) frequency bands) that may be opportunistically used by devices that may be able to tolerate interference from other users.

The wireless communication system 100 may also operate in the Extremely High Frequency (EHF) region of the spectrum (e.g., from 30GHz to 300GHz), which is also referred to as the millimeter-band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communication between the UE 115 and the base station 105, and EHF antennas of respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, propagation of EHF transmissions may experience even greater atmospheric attenuation and shorter ranges than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the frequency band usage designated across these frequency regions may differ by country or regulatory agency.

In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band, such as the 5GHz ISM band. When operating in the unlicensed radio frequency spectrum band, wireless devices, such as base stations 105 and UEs 115, may employ a Listen Before Talk (LBT) procedure to ensure that frequency channels are clear before transmitting data. In some cases, operation in the unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in the licensed band. Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on Frequency Division Duplexing (FDD), Time Division Duplexing (TDD), or a combination of both.

In some examples, a base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., base station 105) equipped with multiple antennas and a receiving device (e.g., UE 115) equipped with one or more antennas. MIMO communication may employ multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Also, the receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiver device; and multi-user MIMO (MU-MIMO), in which a plurality of spatial layers are transmitted to a plurality of devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting or receiving device (e.g., base station 105 or UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array such that signals propagating in a particular orientation relative to the antenna array undergo constructive interference while other signals undergo destructive interference. The adjustment to the signals communicated via the antenna elements may include the transmitting or receiving device applying a particular amplitude and phase shift to the signals carried via each antenna element associated with the device. The adjustment associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to an antenna array of a transmitting device or a receiving device, or relative to some other orientation).

In one example, the base station 105 may use multiple antennas or antenna arrays for beamforming operations for directional communication with the UEs 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times in different directions by the base station 105, which may include a signal being transmitted according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by the base station 105 or a receiving device, such as UE 115) to identify beam directions used by the base station 105 for subsequent transmission or reception.

Some signals, such as data signals associated with a particular recipient device, may be transmitted by the base station 105 in a single beam direction (e.g., a direction associated with the recipient device, such as the UE 115). In some examples, a beam direction associated with transmission along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, the UE 115 may receive one or more signals transmitted by the base station 105 in different directions, and the UE 115 may report an indication to the base station 105 of the signal for which it is received at the highest signal quality or other acceptable signal quality. Although the techniques are described with reference to signals transmitted by the base station 105 in one or more directions, the UE 115 may use similar techniques for transmitting signals multiple times in different directions (e.g., to identify beam directions used by the UE 115 for subsequent transmission or reception) or for transmitting signals in a single direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may attempt multiple receive beams when receiving various signals from base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a recipient device may attempt multiple receive directions by: receiving via different antenna sub-arrays, processing received signals according to different antenna sub-arrays, receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, either of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal). The single receive beam may be aligned in a beam direction determined based at least in part on listening from different receive beam directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based at least in part on listening from multiple beam directions).

In some cases, the antennas of a base station 105 or UE 115 may be located within one or more antenna arrays that may support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some cases, the antennas or antenna arrays associated with the base station 105 may be located at different geographic locations. The base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UEs 115. Likewise, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

In some cases, the wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communication of the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. The Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use hybrid automatic repeat request (HARQ) to provide retransmission by the MAC layer, thereby improving link efficiency. In the control plane, a Radio Resource Control (RRC) protocol layer may provide for establishment, configuration, and maintenance of RRC connections of radio bearers supporting user plane data between the UE 115 and the base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

In some cases, the UE 115 and the base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood that data will be correctly received on the communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), Forward Error Correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput of the MAC layer in poor radio conditions (e.g., signal-to-noise conditions). In some cases, a wireless device may support simultaneous slot HARQ feedback, where the device may provide HARQ feedback in a particular slot for data received in a previous symbol in that slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

The time interval in LTE or NR may be in a basic unit of time (which may for example refer to the sampling period T)_s1/30,720,000 seconds). The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be expressed as T_f＝307,200T_s. The radio frame may be identified by a System Frame Number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. The sub-frame may be further divided into two sub-frames each having a 0.5ms durationTime slots, and each time slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the CP added before each symbol period). Each symbol period may contain 2048 sample periods, excluding CP. In some cases, a subframe may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a TTI. In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of shortened tti (sTTI) or in a selected component carrier using sTTI).

In some wireless communication systems, a slot may be further divided into a plurality of mini-slots containing one or more symbols. In some examples, a symbol of a mini-slot or a mini-slot may be a minimum scheduling unit. For example, each symbol may vary in duration depending on subcarrier spacing (SCS) or operating frequency band. Further, some wireless communication systems may implement timeslot aggregation, where multiple timeslots or mini-timeslots are aggregated together and used for communication between the UE 115 and the base station 105.

The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over the communication link 125. For example, the carrier of the communication link 125 may comprise a portion of a radio frequency spectrum band operating according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. The carriers may be associated with predefined frequency channels (e.g., evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel numbers (EARFCNs)) and may be located according to a channel grid for discovery by UEs 115. The carriers may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique, such as Orthogonal Frequency Division Multiplexing (OFDM) or discrete fourier transform spread OFDM (DFT-S-OFDM)).

The organization of the carriers may be different for different radio access technologies (e.g., LTE-A, LTE-A Pro, NR). For example, communications on a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling supporting decoding of the user data. The carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling that coordinates operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers.

The physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and physical data channels may be multiplexed on the downlink carrier using, for example, Time Division Multiplexing (TDM) techniques, Frequency Division Multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, control information transmitted in the physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a carrier or "system bandwidth" of the wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80MHz) of a carrier of a particular radio access technology. In some examples, each served UE 115 may be configured to operate over part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured for operation using a narrowband protocol type associated with a predefined portion or range within a carrier (e.g., a set of subcarriers or RBs) (e.g., "in-band" deployment of narrowband protocol types).

In a system employing MCM technology, an RE may include one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and SCS are inversely related. The number of bits carried by each RE may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more REs the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate of the UE 115 may be. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and using multiple spatial layers may further improve the data rate of communication with the UE 115.

Devices of the wireless communication system 100 (e.g., base stations 105 or UEs 115) may have a hardware configuration that supports communication over a particular carrier bandwidth or may be configurable to support communication over one carrier bandwidth of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with more than one different carrier bandwidth.

The wireless communication system 100 may support communication with UEs 115 over multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

In some cases, the wireless communication system 100 may utilize an enhanced component carrier (eCC). An eCC may be characterized by one or more characteristics including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are unable to monitor the entire carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of the other component carriers. Shorter symbol durations may be associated with increased spacing between adjacent subcarriers. Devices utilizing an eCC, such as UE 115 or base station 105, may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20, 40, 60, 80MHz, etc.) with a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may include one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, etc. Flexibility in eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectra. In some examples, NR sharing spectrum may improve spectrum utilization and spectral efficiency, particularly through dynamic vertical (e.g., across frequency domains) and horizontal (e.g., across time domains) sharing of resources.

In some cases, devices in a wireless communication system may transmit and receive information using SC waveforms, such as DFT-S-OFDM waveforms. Some SC transmitters may transmit SC waveform processing information to be transmitted using Discrete Fourier Transform (DFT), tone mapping, and Inverse Fast Fourier Transform (IFFT). In some cases, the length of the input samples (e.g., length K) of the DFT operator may be limited (e.g., to have a simple component) in order to reduce complexity. For example, the DFT input sample length K may be limited to any multiple of 2, 3, or 5. In some cases, the IFFT output may create samples having an output sample length of N, which may be a different number than K. The transmitter may append a guard interval or CP to the generated signal and a transmitter Front End (FE) may convert the signal from a digital form to an analog form. In some examples, signals generated in this manner may be transmitted via any portion of the system bandwidth.

Similarly, a wireless device (e.g., base station 105 or UE 115) may use an SC receiver to receive and process SC waveforms and obtain information transmitted within the waveforms. Some SC receivers may receive an analog signal at a receiver Front End (FE), where the receiver FE may convert the signal from analog to digital form. In some cases, the SC receiver may remove the CP, perform a Fast Fourier Transform (FFT) operation on the digital signal (e.g., size N), demap the tones, perform frequency equalization (e.g., minimum mean square error equalization (MMSE-EQ)), perform an inverse dft (idft) operation (e.g., size K), and begin decoding the signal information (e.g., via log-likelihood ratio (LLR) calculations).

However, in some cases, the CP used in the SC waveform may limit the frequency resources to a limited set of resources. For example, some SC signals may have a given ratio of CP length to data length, where the ratio may limit the number of input data (e.g., K) or the number of output data (e.g., N) from the SC transmitter to a particular number of REs so that the CP may have an integer length. The SC transmitter may be limited to transmitting on a number of REs that is a multiple of the number K, where K may represent half of the greatest common divisor of the CP to data ratio in some cases. In some cases, the K REs may not correspond to an integer number of RBs, and the transmitter may therefore determine to transmit on a number of REs that is a multiple of K and also corresponds to an integer number of RBs. Additionally or alternatively, the SC transmitter may determine to transmit on a number of REs that does not correspond to an integer number of RBs.

As such, the UE 115 and the base station 105 may employ SC configurations to identify REs (e.g., within a set of RBs) to be allocated for transmitting uplink or downlink SC signals (e.g., because not all REs within an RB allocation may be used). Additionally or alternatively, the UE 115 and the base station 105 may employ SC configurations with different CP lengths in order to change the basic amount of REs that may be allocated for SC transmission (e.g., while maintaining the full number of CPs), where the different CP lengths may be static or dynamic. In an example, the base station 105 may transmit the indication of the SC configuration via cell signaling (such as within an RRC message) or via a control message (e.g., DCI). Accordingly, UE 115 may receive the RRC message or control message, may decode the message, and may implement an SC transmitter or SC receiver to process the corresponding SC transmission (e.g., downlink or uplink communications) according to the indicated SC configuration.

Fig. 2 illustrates an example of a wireless communication system 200 that supports flexible SC waveforms in accordance with aspects of the present disclosure. In some cases, the wireless communication system 200 may implement aspects of the wireless communication system 100 and may include a base station 105-a and a UE 115-a, which may be examples of the UE 115 and base station 105 described with reference to fig. 1. In some cases, a UE 115-a or a base station 105-a may use an SC waveform for uplink or downlink transmissions, respectively, and may configure the SC waveform using an SC transmission configuration.

The UE 115-a and the base station 105-a may transmit some SC waveforms (e.g., SC-FDM signals) using the signal generation or transmission process described with reference to fig. 1. Additionally or alternatively, the UE 115-a and the base station 105-a may generate SC signals using an upsampling and frequency up-conversion process (e.g., to achieve the same results as DFT, tone mapping and IFFT processes). For example, an SC transmitter of a transmitting device may add a CP (e.g., in the time domain) to information for transmission and may upsample the information from a first number of samples (e.g., K samples) to a second number of samples (e.g., N samples) using an upsampling ratio (e.g., N/K). Furthermore, the SC transmitter may apply an upsampling pulse shaping filter function (e.g., sinc function), where in some cases pulse shaping may result in some PAPR increase. In other cases (e.g., based on the shape of the pulse shaping filter), the SC transmitter may achieve lower PAPR and wider bandwidth occupancy. Additionally or alternatively, the pulse shaping filter may be chosen such that the transmission occupies a portion of the system bandwidth (e.g., to allow UE multiplexing). In some cases, the upconversion process may be achieved by upconversion at the receiver FE or by time domain phase ramping.

In some cases, the SC transmitter may reduce complexity by limiting the up-sampling ratio of N/K to a simple ratio, and may also reduce complexity by using a shorter pulse-shaping filter. Additionally, the SC transmitter may move the SC signal to a desired frequency (e.g., within the frequency band) by choosing an appropriate phase ramp, or in some cases, the SC transmitter may leave the choice of phase ramp to the mixer. In some examples, the UE 115-a and the base station 105-a may implement the SC transmitter in the time domain, which may result in higher complexity.

The UE 115-a and the base station 105-a may receive some SC waveforms (e.g., SC-FDM signals) using the signal reception process described with reference to fig. 1. Additionally or alternatively, the UE 115-a and the base station 105-a may receive the SC signal using a down-conversion, down-sampling, and equalization (e.g., time or frequency domain equalization) process (e.g., to achieve the same results as the FFT, tone demapping, and IDFT processes). In addition, the SC receiver may match the pulse shaping filter used by the transmitting device (e.g., to remove filtering operations). In some examples, an SC receiver may implement a down-conversion process by performing a down-conversion of the time-domain phase ramp at receiver FE. Additionally, the SC receiver may perform downsampling as part of the signal sampling or equalization process, and in some cases, the SC receiver may use a frequency domain equalization or a time domain equalization process. SC receivers can reduce complexity by limiting the down-sampling rate of N/K to a simple ratio, and can also reduce complexity by using a shorter time-domain equalizer. In some cases, the complexity of the process performed by the SC filter may be proportional to the number of taps in the time-domain equalizer. In some examples, the UE 115-a and the base station 105-a may implement the SC receiver in the time domain, and in some cases, the implementation may result in lower complexity.

Some types of wireless communication devices may benefit from the use of SC waveforms compared to other waveforms (e.g., OFDM waveforms, etc.). For example, communications using SC waveforms may have low PAPR and, in some cases, may be implemented at a transmitter and a receiver with low complexity. In an example, the base station 105-a may transmit SC-FDM downlink communications (e.g., one or more downlink messages 215) to the UE 115-a, and the UE 115-a may implement an SC receiver in the time domain to receive the downlink communications while reducing complexity and increasing power savings. Additionally or alternatively, the UE 115-a may transmit SC-FDM uplink communications (e.g., one or more uplink messages 220) to the base station 105-a, where lower PAPR of the SC-FDM uplink signaling may increase power savings at the UE 115-a.

Some SC signals (e.g., SC-FDM waveforms) may have an established ratio of CP length to data duration, such as a CP to data ratio of 144:2048 samples (e.g., which may be reduced to 9:128 samples). In some cases, the SC-FDM CP may be longer (e.g., CP to data sample ratio of 160:2048 or 176: 2048) for the first symbol at the beginning of a TTI, where the longer CP may still have the same greatest common divisor CP to data ratio as other CPs within the TTI (e.g., 128). In some examples, the length of the CP may depend on the SCS of the frequency band corresponding to the transmission. Some ratios of CP to data may limit the number of input data (e.g., K) or the number of output data (e.g., N) from the SC transmitter to a multiple of the greatest common divisor of the CP to data ratio (e.g., 128 samples), such that the CP may have an integer length. In an example, the SC transmitter may be limited to 128 samples of CP values and may employ an upsampling rate of 2. As such, K may be limited to multiples of 64 (e.g., to ensure that N is a multiple of 128), or in other words, the SC transmitter may be limited to transmitting on multiples of 64 REs. In some cases, K may also be limited to multiples of 2, 3, or 5, as discussed with reference to fig. 1.

The SC transmitter may be limited to transmitting on a number of REs that is a multiple of the number K (e.g., half of the greatest common divisor of the CP to data ratio). In some examples, the K REs may not correspond to an integer number of RBs, and the transmitter may therefore determine to transmit on a number of REs that is a multiple of K and also corresponds to an integer number of RBs. For example, the SC transmitter may determine to transmit using 192 REs (corresponding to 16 RBs or 3 units of 64 REs), or may determine to transmit using 384 REs (corresponding to 32 RBs or 6 units of 64 REs). However, this process may limit resource assignments. Accordingly, the SC transmitter may determine to transmit on a multiple of K REs, where the multiple does not correspond to an integer number of RBs (e.g., may transmit on a number of REs that is not the full number of RBs). This process may provide more value for possible resource bandwidth allocations, as illustrated in tables 1 and 2, which illustrate an example where K may be limited to 64 REs and each RB may include 12 REs. Table 1 shows a scenario where an SC transmitter may be limited to transmitting over an integer number of RBs (e.g., where 16 RBs may be a minimum integer number of RBs, which is also a multiple of 64 REs). Table 2 shows a scenario where the SC transmitter can transmit freely over any multiple of K (e.g., 64), which is also a multiple of 2, 3, or 5. Tables 1 and 2 show examples within the same frequency range or spectrum.

TABLE 1 resource combinations of integer numbers of RBs and multiples of 64 REs

TABLE 2 resource combinations of multiples of 64 REs that are also multiples of 2, 3, or 5

Accordingly, the UE 115-a and the base station 105-a may employ SC configuration to determine REs (e.g., within a set of RBs) to allocate for transmitting uplink or downlink SC signals (e.g., because not all REs within an RB allocation may be used). Additionally or alternatively, UE 115-a and base station 105-a may employ SC configurations with different CP lengths, which may be static or dynamic, in order to change the basic amount of REs that may be allocated for SC transmissions.

In an example, the base station 105-a may transmit the indication of the SC configuration via cell signaling (such as within the RRC message 205). Additionally or alternatively, the base station 105-a may transmit an indication of the SC configuration in a control message 210 (e.g., DCI), where the control message may correspond to one or more SC-FDM downlink messages 215 or one or more SC-FDM uplink messages 220. The UE 115-a may receive the RRC message 205 or the control message 210, may decode the message(s), and may enable the SC transmitter or SC receiver to transmit (e.g., downlink message 215 or uplink message 220) with respect to the corresponding SC according to the indicated SC configuration.

As described herein, some SC configurations may indicate REs within an RB allocation on which to transmit or receive communications. For example, in some cases, occupied REs may span the center portion of the allocated RB, leaving the edges unoccupied. In other examples, the base station 105-a may indicate occupied REs starting from the top edge, bottom edge, center, etc. of the RB allocation. In some cases, base station 105-a may indicate which REs to use with a REID value, which may be a function of cell ID in some cases. In some examples, the RB allocation may be based on the amount of REs within the RB (e.g., 12 REs), while the demodulation reference signal (DMRS) pattern, DMRS length, and Transport Block Size (TBS) may be based on a multiple of the number of REs to be allocated or used for transmission (e.g., 64 REs).

Additionally or alternatively, the base station 105-a may employ SC configurations with different CP lengths (e.g., CP to data ratios) in order to reduce the basic number of REs allocated for SC transmissions (e.g., while fully using an integer number of RBs). For example, when using an upsampling ratio of 2, instead of using the CP to data ratio 144:2048, the base station 105-a may specify a ratio of 128:2048 (e.g., which may be reduced to 1:16), thus setting K to a value of 8 (e.g., to obtain an integer CP length, or N is a multiple of 16) and increasing the granularity of resource scheduling. In this example, if an RB has a size of 12 REs, 2 RBs (e.g., 24 REs) may be used to allocate resources without leaving any unused REs. Different CP lengths may reduce the overall CP duration (e.g., by a factor of 11%) and may be used by various waveforms, such as OFDM, SC-FDM, SC Quadrature Amplitude Modulation (QAM), etc.

In some examples, base station 105-a may employ SC configurations with dynamic CP lengths (e.g., CP to data ratios) in order to reduce the basic number of REs allocated for SC transmissions (e.g., while fully using an integer number of RBs). In some cases, the CP ratio may be based on the bandwidth used for transmission. The total number of CP samples may be divided evenly across the TTI (e.g., 0.5ms) while folding the remaining CP samples into the first symbol of the TTI. For example, for SCS at 15kHz and allocation of 100 RBs, the base station 105-a may configure the first symbol CP with a length of 90 samples (e.g., a CP to data ratio of 90:1200) and use a CP length of 85 samples (e.g., a CP to data ratio of 85:1200) for the other symbols. In some cases, the dynamic CP length may increase the utility of the CP by increasing the size of the smallest CP within the TTI relative to the largest CP within the TTI. In some examples, the dynamic CP length may be implemented when the assigned bandwidth is known or defined and may be used across all UEs 115 within that bandwidth (e.g., to facilitate frequency domain processing).

Fig. 3 illustrates an example of an RB scheme 300 supporting flexible SC waveforms, according to aspects of the present disclosure. In some cases, the RB scheme 300 may implement aspects of the wireless communication system 100 or 200 and may be implemented by a base station 105 and a UE 115, which may be examples of the base station 105 and UE 115 described with reference to fig. 1 and 2. In some cases, the UE 115 and the base station 105 may use the SC waveform for uplink or downlink transmission, and may transmit the SC waveform using an SC transmission configuration.

In some examples, the SC transmission configuration may include an indication of REs (e.g., via an RRC message or a control message) to be used for one or more uplink or downlink communications between the base station 105 and the UE 115. The base station 105 may communicate with multiple UEs 115 on the uplink or downlink and may assign one or more RB allocations 305 (e.g., each RB allocation having an integer number of RBs) for uplink or downlink communications with the multiple UEs 115 over one or more TTIs 315. For example, base station 105 may assign RB allocation 305-a for uplink or downlink communications with UE 115 during TTI 315-a, and may assign RB allocations 305-b and 305-c for communications with one or more other UEs 115 during TTI 315-a. Further, the base station 105 may employ an SC configuration in which transmissions (e.g., uplink or downlink transmissions) may occur over a number of REs corresponding to a base K (e.g., transmissions may occur over a number of REs that is a multiple of K), as discussed with reference to fig. 2. In some cases, the base station 105 or UE 115 may transmit on a number of REs that are multiples of K but do not correspond to an integer number of RBs. As such, the base station 105 may indicate an SC configuration (e.g., via an RRC message or a control message) that specifies the number and location of REs (e.g., occupied REs 310) to be used for uplink or downlink transmissions. UE 115 may use the SC configuration to process information for downlink communications contained in occupied REs 310 or to transmit information for uplink communications in occupied REs 310.

For example, the base station 105 may assign 6 RBs to the UE 115 in RB allocation 305-a (e.g., for downlink or uplink communications), where each RB may include 12 REs. In some cases, the occupied REs 310 for the uplink or downlink transmission may be indicated (e.g., via RRC or control messaging) by the base station 105 to include 64 REs (e.g., where K may be 64) of the 72 available REs within RB allocation 305-a (e.g., 8 REs may be left unoccupied). In other examples, the base station 105 may assign a different number of RBs to the UE 115 in the RB allocation 305-a, and the occupied REs 310 may also represent the different number of REs based on a multiple of the number K. In addition, the base station 105 may also indicate (e.g., via RRC or control messaging) the location of occupied REs 310 within the RB allocation 305-a.

In some examples, the base station 105 may indicate occupied REs 310 to span a center portion of the RB allocation 305-a while leaving edge REs unoccupied. In such a case, the unused REs may be used as protection for bandwidth extension pulse shaping. In some discrete fourier transform spread (DFT-S) implementations, the central portion across RB allocation 305-a may relate to a portion of RBs on both edges of RB allocation 305-a. In other examples, the base station 105 may indicate where occupied REs 310 are located within the RB allocation 305-a (e.g., based on transmission characteristics, serving cell, time interval, etc.). For example, base station 105 may map occupied REs 310 from a top edge, a bottom edge, a center RE, or other designated location within RB allocation 305-a. In some cases, the base station 105 may employ a REID (e.g., similar to a redundancy version id (rvid) in the frequency domain) that the UE 115 may use to identify occupied REs 310 within the RB allocation 305-a. For example, the base station 105 may use the REID to indicate the starting REs (e.g., top REs, bottom REs, center REs, etc.) and ending REs of the occupied REs 310. Additionally or alternatively, the base station 105 may use the REID to indicate a starting RE of the occupied REs 310 (e.g., a top RE (e.g., the RE associated with the lowest RE index of the set of REs), a bottom RE (e.g., the RE associated with the highest RE index of the set of REs), a center RE (e.g., the RE associated with the middle RE index of the set of REs), etc.), and may indicate the number of occupied REs 310 and the direction of the occupied REs 310 within the RB allocation 305-a (e.g., in the frequency domain). The base station 105 may perform similar operations on the RB allocations 305-b and 305-c as one or more other UEs 115.

In some cases, the REID used within RB allocation 305-a may be a function of the cell ID, such that different cells may use different REIDs to randomize interference across cells. The base station 105 may indicate the REID in an RRC configuration (e.g., RRC message) or DCI (e.g., control message), and in some cases, the base station 105 may change the DCI format to include an indication of Radio Network Temporary Identifier (RNTI) differentiation of the REID.

As described herein, the base station 105 can assign an RB allocation 305 on an integer grid, where an RB can include a certain number of REs (e.g., 12 REs). In some examples, the base station 105 may base the DMRS pattern, DMRS length, and TBS on different grids associated with the base K of REs (e.g., 64 REs).

Fig. 4A illustrates an example of a signal processing flow 401 supporting flexible SC waveforms, according to aspects of the present disclosure. In some examples, the signal processing flow 401 may implement aspects of the wireless communication system 100 or 200 and may be implemented by a UE 115 or a base station 105, which may be examples of the UE 115 or base station 105 described with reference to fig. 1-3. In some cases, the UE 115 or base station 105 may use the SC waveform for uplink or downlink transmissions and may configure the corresponding SC transmission using the signal processing flow 401.

At 405, the UE 115 or base station 105 (e.g., transmitting wireless device) may perform constellation mapping. In some cases, constellation mapping may include modulating bits for transmission according to a modulation scheme, which may result in symbols for transmission.

At 410, the transmitting wireless device may add a CP to each symbol for transmission. In some cases, adding a CP may include adding CPs with different static or dynamic lengths, as discussed with reference to fig. 2, 5A, and 5B.

At 415, the transmitting wireless device may perform upsampling on the modulated information, as discussed with reference to fig. 2. In some cases, upsampling may include performing upsampling according to a specified ratio (e.g., N/K).

At 420, the transmitting wireless device may perform pulse shaping on the modulated, upsampled information. In some examples (e.g., based on the shape of the pulse shaping filter), the transmitting wireless device may achieve lower PAPR and wider bandwidth occupancy. Additionally or alternatively, the pulse shaping filter may be chosen such that the transmission occupies a portion of the system bandwidth (e.g., to allow UE multiplexing).

At 425, the transmitting wireless device may perform transmit FE processing at the transmitter FE. In some cases, transport FE processing may include converting information to be transmitted from a digital signal to an analog signal.

Fig. 4B illustrates an example of a signal processing flow 402 supporting flexible SC waveforms in accordance with aspects of the present disclosure. In some examples, the signal processing flow 402 may implement aspects of the wireless communication system 100 or 200 and may be implemented by a UE 115 or a base station 105, which may be examples of the UE 115 or base station 105 described with reference to fig. 1-3. In some cases, the UE 115 or base station 105 may use the SC waveform for uplink or downlink transmissions and may receive corresponding SC transmissions using the signal processing flow 402.

At 450, the UE 115 or base station 105 (e.g., the receiving wireless device) may perform receive FE processing on the received signal. In some cases, this processing may be performed at the receiver FE and may include performing up-conversion, down-conversion, or time-domain phase ramping at the receiver FE. Additionally, receive FE processing may include converting the received information from an analog signal to a digital signal.

At 455, the receiving wireless device may perform sampling of the received information. In some cases, the receiving wireless device may perform downsampling as part of the sampling process.

At 460, the receiving wireless device may match a pulse shaping filter used to communicate the received information (e.g., to cancel the filtering operation).

At 465, the receiving wireless device may perform time domain equalization or frequency domain equalization on the received information and may also downsample the received information (e.g., if not performed at 455).

At 470, the receiving wireless device may begin decoding the received information by performing LLR calculations.

Fig. 5A illustrates an example of a CP scheme 501 supporting flexible SC waveforms, according to aspects of the present disclosure. In some examples, the CP scheme 501 may implement aspects of the wireless communication system 100 or 200 and may be implemented by the UE 115 and the base station 105, which may be examples of the UE 115 and the base station 105 described with reference to fig. 1-4. In some cases, the UE 115 and the base station 105 may use the SC waveform for uplink or downlink transmission, and may configure the SC waveform using an SC transmission configuration.

In some examples, the SC transmission configuration may include an indication (e.g., via an RRC message or a control message) of different CP lengths (e.g., CP to data ratios) for all SC transmissions. In some cases, CPs based on different CP lengths may remain an integer when transmitted using multiple REs that are multiple of the number K, which may be less than the number K using longer CPs in some cases. Thus, the CP length may enable the base station 105 to schedule transmission resources (e.g., uplink or downlink resources) using an integer number of RBs, which may be smaller than the number of RBs used with a longer CP, allowing for more flexible scheduling (e.g., due to finer RB granularity).

In an example, the base station 105 can configure the UE 115 to use (e.g., via RRC or control signaling) a basic CP to data ratio of 128:2048 (e.g., which can be reduced to 1:16) for uplink or downlink communications. In an example, with 15kHz SCS and 20MHz bandwidth, for a first symbol 515-a within a TTI (e.g., including seven symbols), the base station 105 can set the ratio of samples within the CP 505-a to samples within the data region 510-a to 256: 2048. Similarly, in the second symbol 515-b within the TTI (e.g., and subsequent symbols of the TTI), the base station 105 may set the ratio of samples within the CP 505-b to samples within the data region 510-b to 128: 2048. In another example, with 30kHz SCS and 100MHz bandwidth, for the first symbol 515-a within a TTI (e.g., comprising 14 symbols), the base station 105 may set the ratio of samples within the CP 505-a to samples within the data region 510-a to 768: 2048. Similarly, in the second symbol 515-b within the TTI (e.g., and subsequent symbols of the TTI), the base station 105 can set the ratio of samples within the CP 505-b to samples within the data region 510-b to 256: 2048. The UE 115 may use the configured CP length to process downlink communications or to transmit uplink communications to the base station 105.

In some cases (e.g., with an upsampling ratio of 2), the above CP ratio may be such that the minimum number of REs (e.g., K) for one transmission is 8 (e.g., in order to maintain an integer CP). After 2 times upsampling, these CP ratios may create a 1:16 CP to data ratio for the symbol following the first symbol in the TTI and an X:16 CP to data ratio for the first symbol in the TTI, where X may be greater than 1. In an example, an RB may contain 12 REs, and two RBs may thus correspond to three sets of eight REs (e.g., three sets of K REs). Thus, resource scheduling may be performed at a finer granularity (e.g., two RBs) while maintaining an integer number of occupied RBs within the scheduled resource.

In some cases where a different configured CP length is used, the CP length may be reduced by a certain factor (e.g., 11% or (144- > 128)/144 in the above example) when compared to other CP lengths. For example, the CP in a 15kHz SCS may be reduced from 4.69 μ s to 4.17 μ s, the CP in a 960kHz SCS may be reduced from 73 nanoseconds (ns) to 37ns, and the CP in a 1.92MHz SCS may be reduced from 65ns to 32 ns. In some examples, the base station 105 may apply different configured CP lengths to different waveforms, such as OFDM, SC-FDM, SC-QAM, and so forth.

Fig. 5B illustrates an example of a CP scheme 502 supporting flexible SC waveforms, according to aspects of the present disclosure. In some examples, the CP scheme 502 may implement aspects of the wireless communication system 100 or 200 and may be implemented by the UE 115 and the base station 105, which may be examples of the UE 115 and the base station 105 described with reference to fig. 1-4. In some cases, the UE 115 or base station 105 may use the SC waveform for uplink or downlink transmission, and may configure the SC waveform using an SC transmission configuration.

In some examples, the SC transmission configuration may include an indication (e.g., via an RRC message or a control message) of a CP length (e.g., a CP to data ratio) that may change for different SC transmissions (e.g., may be different for different bandwidths). In some examples, the CP samples for a TTI may be divided evenly (e.g., 0.5ms) across symbols within the TTI, while folding the remainder of the samples into the first symbol of the TTI. In some cases, CPs based on different CP lengths may remain an integer when transmitted using multiple REs that are multiple of the number K, which may be less than the number K using longer CPs in some cases. Thus, the CP length may enable the base station 105 to schedule transmission resources (e.g., uplink or downlink resources) using an integer number of RBs, which may be smaller than the number of RBs used with a longer CP, allowing for more flexible scheduling (e.g., due to finer RB granularity).

In an example, with 15kHz SCS and 100RB assignment (e.g., 18MHz assigned bandwidth), for a first symbol 515-c within a TTI (e.g., comprising seven symbols), the base station 105 can set the ratio of samples within the CP 505-c to samples within the data region 510-c to 90: 1200. Similarly, in the second symbol 515-d within the TTI (e.g., and subsequent symbols of the TTI), the base station 105 can set the ratio of samples within the CP 505-d to samples within the data region 510-d to 85: 1200. In another example, with a 15kHz SCS and 50RB assignment (e.g., 9MHz assigned bandwidth), for the first symbol 515-c within a TTI (e.g., comprising seven symbols), the base station 105 may set the ratio of samples within the CP 505-c to samples within the data region 510-c to 48: 600. Similarly, in the second symbol 515-d within the TTI (e.g., and subsequent symbols of the TTI), the base station 105 can set the ratio of samples within the CP 505-d to samples within the data region 510-d to 42: 600. The UE 115 may use the configured CP length to process downlink communications or to transmit uplink communications to the base station 105.

In some cases, the above CP ratio may enable resource scheduling to be performed with finer granularity while maintaining an integer number of occupied RBs within the scheduled resource. Additionally, using similar CP lengths for the first and subsequent symbols of a TTI may increase the utility of the CP, which may be limited by the minimum CP in the TTI in some cases. In some cases, the CP length may be automatic based on the number of RBs assigned (e.g., automatically determined by the base station 105) or may be calculated by the UE 115 after receiving a control message (e.g., DCI) indicating the number of RBs used for downlink or uplink communications.

In some cases where the assigned bandwidth is known or predefined, the base station 105 may enable dynamic CP ratios. For example, the UE 115 may be preconfigured to operate using an RB bandwidth (e.g., 100 RBs, 50 RBs, etc.), and may receive an indication or perform a calculation to identify a CP length for uplink or downlink communications. Additionally or alternatively, the UE 115 may receive a grant (e.g., via a control message such as DCI) based on a preconfigured or pre-assigned bandwidth related to a data channel assignment that is more flexible in terms of bandwidth (e.g., provided that the time between receiving the grant and transmitting or receiving on the data channel is long enough for the UE 115 to decode the grant and process the data according to the dynamic CP ratio). Further, if multiple UEs 115 are FDM in the same TTI, the base station 105 may maintain the same CP across the UEs 115 to facilitate frequency domain processing and may schedule the UEs 115 to operate at the same bandwidth.

Fig. 6 illustrates an example of a process flow 600 supporting flexible SC waveforms in accordance with aspects of the present disclosure. In some examples, the process flow 600 may implement aspects of the wireless communication system 100 or 200 and may include a UE 115-b and a base station 105-b, which may be examples of the UE 115 and base station 105 described with reference to fig. 1-5. The process flow 600 may also implement aspects of the RB scheme 300, the signal processing flow 401, the signal processing flow 402, the CP scheme 501, or the CP scheme 502. In some cases, a UE 115-b or base station 105-b may use an SC waveform for uplink or downlink transmission, and may configure the SC waveform using an SC transmission configuration.

In the following description of process flow 600, communications between a UE 115-b and a base station 105-b may be transmitted in a different order than shown, or operations performed by the base station 105-b and the UE 115-b may be performed in a different order or at a different time. Certain operations may also be excluded from the process flow 600 or other operations may be added to the process flow 600. It is to be appreciated that although base station 105-b and UE 115-b are illustrated as performing several of the operations of process flow 600, any wireless device may perform the illustrated operations. For example, base station 105-b may represent any wireless transmitting device and UE 115-b may represent any wireless receiving device. As such, in some cases, the process shown as being performed by UE 115-b may be performed by base station 105-b, and in some cases, the process shown as being performed by base station 105-b may be performed by UE 115-b

At 605, in some cases, UE 115-b may transmit a message to a transmitting device (e.g., base station 105-b) indicating a transmission configuration for an SC waveform based on a REID included in the message. In some cases, the REID may be based on a cell ID of a cell used for communication between the transmitting device and the receiving device. In some cases, UE 115-b may transmit an indication of the mapping configuration to the transmitting device in the message, where the message may include the transmission configuration.

At 610, the base station 105-b may identify a transmission configuration for the SC waveform, where the transmission configuration may indicate a set of RBs allocated for communication with a receiving device (e.g., UE 115-b). Additionally or alternatively, base station 105-b may identify a transmission configuration for the SC waveform that indicates a CP ratio of a CP of the SC waveform and a set of RBs allocated for communication with the receiving device. In some cases, identifying the transmission configuration may include determining a DMRS pattern, DMRS length, or TBS associated with the SC waveform based on the RE set or the number of RE sets.

At 615, the base station 105-b may determine a CP configuration for the SC waveform based on the transmission configuration, where the CP configuration may indicate a first CP ratio for an initial symbol of the SC waveform (e.g., an initial symbol within a TTI) and a second CP ratio, different from the first CP ratio, for one or more symbols following the initial symbol of the SC waveform (e.g., within the same TTI). In some examples, base station 105-b may generate a first CP for an initial symbol (e.g., of a TTI) based on a first CP ratio and at least one additional CP for one or more symbols after the initial symbol (e.g., within the same TTI) based on a second CP ratio, where the second CP ratio may be less than the first CP ratio.

In some cases, base station 105-b may determine the first CP ratio and the second CP ratio based on SCs associated with the SC waveform. For example, the number of samples of the first CP and the number of samples of the at least one additional CP may be based on the SCS. In some cases, base station 105-b may determine the first CP ratio and the second CP ratio based on a bandwidth portion (BWP) associated with the SC waveform. For example, the number of samples of the first CP and the number of samples of the at least one additional CP may be based on the number of RB sets of the BWP.

At 620, base station 105-b may allocate a set of REs in the set of RBs based on the transmission configuration as an SC waveform, where the number of the set of REs may be less than a total number of REs in the set of RBs. Additionally or alternatively, base station 105-b may allocate a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio.

At 625, in some cases, base station 105-b may transmit an indication of the transmission configuration to the receiving device via RRC signaling or DCI. In some cases, base station 105-b may transmit an indication of the mapping configuration to the recipient device in the message, where the message may include the transmission configuration.

At 630, UE 115-b may identify a transmission configuration for the SC waveform, where the transmission configuration may indicate a set of RBs allocated for communication with the transmitting device. Additionally or alternatively, UE 115-b may identify a transmission configuration for the SC waveform indicating a CP ratio of a CP of the SC waveform and a set of RBs allocated for communication with the transmitting device. In some cases, UE 115-b may identify the transmission configuration prior to 505 (e.g., to transmit a message indicating the transmission configuration). In some cases, identifying the transmission configuration may include determining a DMRS pattern, DMRS length, or TBS associated with the SC waveform based on the RE set or the number of RE sets.

At 635, the UE 115-b may determine a CP configuration for the SC waveform based on the transmission configuration, where the CP configuration may indicate a first CP ratio for an initial symbol of the SC waveform (e.g., an initial symbol within a TTI) and a second CP ratio, different from the first CP ratio, for one or more symbols following the initial symbol of the SC waveform (e.g., within the same TTI). In some examples, UE 115-b may identify a first CP for an initial symbol (e.g., of a TTI) based on a first CP ratio and identify at least one additional CP for one or more symbols following the initial symbol (e.g., within the same TTI) based on a second CP ratio, where the second CP ratio may be less than the first CP ratio.

In some cases, UE 115-b may determine the first CP ratio and the second CP ratio based on SCs associated with the SC waveform. For example, the number of samples of the first CP and the number of samples of the at least one additional CP may be based on the SCS. In some cases, UE 115-b may determine the first CP ratio and the second CP ratio based on a BWP associated with the SC waveform. For example, the number of samples of the first CP and the number of samples of the at least one additional CP may be based on the number of RB sets of the BWP.

At 640, base station 105-b may identify a mapping configuration for mapping data associated with the SC waveform to a set of REs based on the transmission configuration, and may map the data associated with the SC waveform to the set of REs according to the mapping configuration. In some examples, mapping the data may include mapping data beginning with a first RE (e.g., an RE at the bottom edge of the RB bandwidth), a middle RE, or a last RE (e.g., an RE at the top edge of the RB bandwidth) based on the mapping configuration and a respective location of each RE in the set of REs. In some cases, the data may be mapped such that at least one RE in the set of REs is unoccupied.

At 645, the UE 115-b may determine a set of REs in a set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs may be less than a total number of REs in the set of RBs. Additionally or alternatively, UE 115-b may determine a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio.

At 650, base station 105-b may transmit the SC waveform to the receiving device via the set of REs. Additionally or alternatively, base station 105-b may transmit an SC waveform including the CP to a receiving device via the set of REs according to the CP ratio. In some cases, transmitting the SC waveform may include transmitting the SC waveform including the first CP and the at least one additional CP to the receiving device.

At 655, the UE 115-b may identify a mapping configuration for data of the SC waveform mapped to the set of REs based on the transmission configuration and may de-map the data of the SC waveform. In some cases, UE 115-b may demap data starting from a first RE, an intermediate RE, or a last RE of the set of REs based on the mapping configuration and the respective location of each RE in the set of REs.

Fig. 7 illustrates a block diagram 700 of an apparatus 705 that supports flexible SC waveforms in accordance with aspects of the present disclosure. The device 705 may be an example of aspects of a UE 115 or a base station 105 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. The device 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

Receiver 710 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to flexible SC waveforms, etc.). Information may be passed to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 1020 or 1120 described with reference to fig. 10 and 11. Receiver 710 can utilize a single antenna or a set of antennas.

The communication manager 715 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a receiving device, allocate a set of REs in the set of RBs based on the transmission configuration for the SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and transmit the SC waveform to the receiving device via the set of REs. The communication manager 715 may identify a transmission configuration for an SC waveform indicating a CP ratio of a CP of an RB set and the SC waveform allocated for communication with a receiver device, allocate a RE set of the RB set for an SC waveform including the CP based on the transmission configuration and the CP ratio, and transmit the SC waveform including the CP to the receiver device via the RE set according to the CP ratio.

The communication manager 715 may also identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the transmitting device, determine a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and receive the SC waveform from the transmitting device via the set of REs. The communication manager 715 may also identify a transmission configuration for an SC waveform indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with the transmitting device, determine a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receive the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio. The communication manager 715 may be an example of aspects of the communication manager 1110 or 1010 as described herein.

The communication manager 715 or subcomponents thereof may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 715 or subcomponents thereof may be performed by a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

The communication manager 715 or subcomponents thereof may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 715 or subcomponents thereof may be separate and distinct components, in accordance with various aspects of the present disclosure. In some examples, the communication manager 715 or subcomponents thereof may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof, in accordance with various aspects of the present disclosure.

In some examples, the communication manager 715 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 710 and the transmitter 720 may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled with the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

The actions performed by the communication manager 715 as described herein may be implemented to achieve one or more potential advantages. An implementation may allow a UE 115 to conserve power and increase battery life by enabling an SC receiver (e.g., in the time domain) to receive downlink communications (e.g., from a base station 105). Additionally or alternatively, the UE 115 may further implement an SC transmitter to transmit the uplink communication (e.g., to the base station 105), which may result in a lower PAPR for the uplink communication, as well as further power savings and increased battery life. Another implementation may provide improved quality of service and reliability at the UE 115 by reducing the complexity of implementing an SC receiver or transmitter, which may also reduce latency.

Transmitter 720 may transmit signals generated by other components of device 705. In some examples, transmitter 720 may be co-located with receiver 710 in a transceiver module. For example, the transmitter 720 may be an example of aspects of the transceiver 1020 or 1120 described with reference to fig. 10 and 11. The transmitter 720 may utilize a single antenna or a set of antennas. In some examples, the communication manager 715 may be implemented as an integrated circuit or chipset for a mobile device modem and the receiver 710 and the transmitter 720 may be implemented as analog components (e.g., amplifiers, filters, antennas, etc.) coupled with the mobile device modem to enable wireless transmission and reception over one or more frequency bands.

Fig. 8 illustrates a block diagram 800 of an apparatus 805 that supports flexible SC waveforms in accordance with aspects of the present disclosure. The device 805 may be an example of aspects of the device 705, the UE 115, or the base station 105 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 840. The device 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

Receiver 810 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to flexible SC waveforms, etc.). Information may be passed to other components of device 805. The receiver 810 may be an example of aspects of the transceiver 1020 or 1120 described with reference to fig. 10 and 11. Receiver 810 can utilize a single antenna or a set of antennas.

The communication manager 815 may be an example of aspects of the communication manager 715 as described herein. Communication manager 815 may include an SC transmission configuration component 820, an RE configuration component 825, an SC transmission component 830, and an SC reception component 835. The communication manager 815 may be an example of aspects of the communication manager 1010 or 1110 as described herein.

SC transmission configuration component 820 can identify a transmission configuration for an SC waveform that indicates a set of RBs allocated for communication with a receiving device or a transmitting device. SC transmission configuration component 820 can identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a receiving or transmitting device and a CP ratio of a CP of the SC waveform.

RE configuring component 825 may allocate a set of REs in the set of RBs based on the transmit configuration as a SC waveform, wherein the number of sets of REs is less than the total number of REs in the set of RBs. RE configuration component 825 may allocate a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio. RE configuration component 825 may determine a set of REs in the set of RBs for the SC waveform based on the transmission configuration, wherein the number of sets of REs is less than a total number of REs in the set of RBs. RE configuring component 825 may determine a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio.

SC transmitting component 830 may transmit the SC waveform to a receiving device via the set of REs. SC transmitting component 830 may transmit an SC waveform including the CP to a receiving device via the set of REs according to the CP ratio. SC receive component 835 may receive the SC waveform from the transmitting device via the set of REs. SC receiving component 835 may receive an SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

Transmitter 840 may transmit signals generated by other components of device 805. In some examples, the transmitter 840 may be co-located with the receiver 810 in a transceiver module. For example, the transmitter 840 may be an example of aspects of the transceiver 1020 or 1120 described with reference to fig. 10 and 11. Transmitter 840 may utilize a single antenna or a set of antennas.

In some examples, the communication manager 815 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 810 and transmitter 820 may be implemented as analog components (e.g., amplifiers, filters, antennas, etc.) coupled with the mobile device modem to enable wireless transmission and reception.

Based on implementing the SC receiver and/or the SC transmitter, a processor of UE 115 (e.g., controlling receiver 710, transmitter 740, or SC transmission component 920 described with reference to fig. 9) may reduce complexity and efficiently receive downlink SC communications and transmit uplink SC communications (e.g., via SC transmission configuration component 820 or RE configuration component 825). Further, the processor of UE 115 may receive an indication of an SC configuration to be implemented at an SC receiver or an SC transmitter. The processor of the UE 115 may use the SC configuration to control an SC receiver or an SC transmitter within the UE 115 for communicating SC waveforms.

Fig. 9 illustrates a block diagram 900 of a communication manager 905 supporting flexible SC waveforms in accordance with aspects of the present disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, the communication manager 815, or the communication manager 1010 described herein. Communications manager 905 may include an SC transmission configuration component 910, an RE configuration component 915, an SC transmission component 920, an RE mapping component 925, a CP determining component 930, a CP generating component 935, an SC receiving component 940, an RE demapping component 945, and a CP identifying component 950. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

SC transmission configuration component 910 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a receiving device. In some examples, SC transmission configuration component 910 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a receiving device and a CP ratio of a CP of the SC waveform. In some examples, SC transmission configuration component 910 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a transmitting device. In some examples, SC transmission configuration component 910 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a transmitting device and a CP ratio of a CP of the SC waveform.

In some examples, SC transmission configuration component 910 may receive an indication of the mapping configuration in a message from a recipient device, the message including the transmission configuration. In some examples, SC transmission configuration component 910 may transmit an indication of the transmission configuration to the receiving device via RRC signaling or DCI. In some examples, SC transmission configuration component 910 may receive a message from the recipient device indicating a transmission configuration for the SC waveform based on a REID included in the message. In some examples, SC transmission configuration component 910 may determine a DMRS pattern, DMRS length, or TBS associated with the SC waveform based on the set of REs or the number of sets of REs.

In some examples, SC transmission configuration component 910 may receive an indication of the mapping configuration in a message from the transmitting device, the message including the transmission configuration. In some examples, SC transmission configuration component 910 may receive an indication of the transmission configuration from the receiving device via RRC signaling or DCI. In some examples, SC transmission configuration component 910 may transmit a message to the transmitting device indicating the transmission configuration for the SC waveform based on the REID included in the message. In some cases, the REID is based on a cell ID of a cell used for communication between the transmitting device and the receiving device. In some examples, SC transmission configuration component 910 may determine a DMRS pattern, DMRS length, or TBS associated with the SC waveform based on the set of REs or the number of sets of REs.

The RE configuration component 915 may allocate a set of REs in the set of RBs based on the transmit configuration as a SC waveform, wherein the number of sets of REs is less than the total number of REs in the set of RBs. In some examples, RE configuring component 915 may allocate a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio. In some examples, RE configuring component 915 may determine a set of REs in the set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs is less than the total number of REs in the set of RBs. In some examples, RE configuring component 915 may determine a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio.

SC transmitting component 920 may transmit the SC waveform to a receiving device via the set of REs. In some examples, SC transmitting component 920 may transmit an SC waveform including the CP to a receiving device via the set of REs according to the CP ratio. In some examples, SC transmitting component 920 may transmit an SC waveform including the first CP and the at least one additional CP to the receiving device.

RE mapping component 925 may identify a mapping configuration for mapping data associated with the SC waveform to the set of REs based on the transmission configuration. In some examples, RE mapping component 925 may map data associated with the SC waveform to the set of REs according to the mapping configuration. In some examples, RE mapping component 925 may map data beginning with a first RE, an intermediate RE, or a last RE of the set of REs based on the mapping configuration and a respective location of each RE in the set of REs. In some cases, the data is mapped such that at least one RE in the set of REs is unoccupied.

CP determining component 930 may determine a CP configuration for the SC waveform based on the transmission configuration, where the CP configuration indicates a first CP ratio for an initial symbol of the SC waveform and a second CP ratio, different from the first CP ratio, for one or more symbols following the initial symbol of the SC waveform. In some examples, CP determining component 930 may determine the first CP ratio and the second CP ratio based on an SCs associated with the SC waveform. In some examples, CP determining component 930 may determine the first CP ratio and the second CP ratio based on a BWP associated with the SC waveform. In some cases, the number of samples of the first CP and the number of samples of the at least one additional CP are based on the SCS. In some cases, the number of samples of the first CP and the number of samples of the at least one additional CP are based on a number of RB sets of the BWP.

CP generating component 935 may generate a first CP for the initial symbol based on the first CP ratio. In some examples, CP generating component 935 may generate at least one additional CP for one or more symbols after the initial symbol based on a second CP ratio, wherein the second CP ratio is less than the first CP ratio.

SC receiving component 940 may receive the SC waveform from the transmitting device via the set of REs. In some examples, SC receiving component 940 may receive an SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio. In some examples, SC receiving component 940 may receive an SC waveform from a transmitting device that includes the first CP and the at least one additional CP.

RE demapping component 945 may identify a mapping configuration for data of SC waveforms mapped to the set of REs based on the transmission configuration. In some examples, RE demapping component 945 may demap data of the SC waveform. In some examples, RE demapping component 945 may demap data beginning at a first RE, an intermediate RE, or a last RE of the set of REs based on the mapping configuration and a respective position of each RE of the set of REs.

CP identifying component 950 can identify a first CP of the initial symbol based on the first CP ratio. In some examples, CP identifying component 950 may identify at least one additional CP for one or more symbols after the initial symbol based on a second CP ratio, wherein the second CP ratio is less than the first CP ratio.

Fig. 10 shows a diagram of a system 1000 of an apparatus 1005 supporting flexible SC waveforms, according to aspects of the present disclosure. Device 1005 may be an example of device 705, device 805, or UE 115 or include components of device 705, device 805, or UE 115 as described herein. Device 1005 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1010, a transceiver 1020, an antenna 1025, a memory 1030, a processor 1040, and an I/O controller 1050. These components may be in electronic communication via one or more buses, such as bus 1055.

Communication manager 1010 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a receiving device, allocate a set of REs in the set of RBs based on the transmission configuration for the SC waveform, wherein the number of sets of REs is less than a total number of REs in the set of RBs, and transmit the SC waveform to the receiving device via the set of REs. The communication manager 1010 may identify a transmission configuration of an SC waveform indicating a CP ratio of a CP of an RB set and the SC waveform allocated for communication with a receiver device, allocate an RE set of the RB set for the SC waveform including the CP based on the transmission configuration and the CP ratio, and transmit the SC waveform including the CP to the receiver device via the RE set according to the CP ratio.

Communication manager 1010 may further identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the transmitting device, determine a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and receive the SC waveform from the transmitting device via the set of REs. The communication manager 1010 may also identify a transmission configuration for an SC waveform indicating a CP ratio of a CP of an SC waveform and a set of RBs allocated for communication with a transmitting device, determine a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receive the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

The transceiver 1020 may communicate bi-directionally via one or more antennas, wired or wireless links, as described herein. For example, transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, as well as demodulate packets received from the antennas.

In some cases, device 1005 may include a single antenna 1025, or device 1005 may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

Memory 1030 may include Random Access Memory (RAM), Read Only Memory (ROM), or a combination thereof. The memory 1030 may store computer readable code 1035 comprising instructions that, when executed by a processor (e.g., the processor 1040), cause the device to perform various functions described herein. In some cases, memory 1030 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 1040 may include intelligent hardware devices (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to operate the memory array using a memory controller. In other cases, a memory controller may be integrated into processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks to support flexible SC waveforms).

I/O controller 1050 may manage input and output signals of device 1005. I/O controller 1050 may also manage peripheral devices that are not integrated into device 1005And (4) preparing. In some cases, I/O controller 1050 may represent a physical connection or port to an external peripheral device. In some cases, the I/O controller 1050 may utilize an operating system, such as Or another known operating system. In other cases, I/O controller 1050 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I/O controller 1050 can be implemented as part of a processor. In some cases, a user may interact with device 1005 via I/O controller 1050 or via hardware components controlled by I/O controller 1050.

Code 1035 may include instructions for implementing aspects of the disclosure, including instructions for supporting wireless communications. Code 1035 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 11 shows a diagram of a system 1100 of a device 1105 supporting flexible SC waveforms, in accordance with aspects of the present disclosure. Device 1105 may be an example of or include a device 705, device 805, or base station 105 as described herein. The device 1105 may include components for two-way voice and data communications including components for transmitting and receiving communications including a communications manager 1110, a network communications manager 1115, a transceiver 1120, an antenna 1125, a memory 1130, a processor 1140, and an inter-station communications manager 1145. These components may be in electronic communication via one or more buses, such as bus 1155.

Communication manager 1110 may identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a receiving device, allocate a set of REs in the set of RBs based on the transmission configuration for the SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and transmit the SC waveform to the receiving device via the set of REs. Communication manager 1110 may identify a transmission configuration of an SC waveform indicating a CP ratio of a CP of an RB set and the SC waveform allocated for communication with a receiver device, allocate a RE set of the RB set for the SC waveform including the CP based on the transmission configuration and the CP ratio, and transmit the SC waveform including the CP to the receiver device via the RE set according to the CP ratio.

Communication manager 1110 may also identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the transmitting device, determine a set of REs of the set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs is less than a total number of REs in the set of RBs, and receive the SC waveform from the transmitting device via the set of REs. Communication manager 1110 may also identify a transmission configuration for an SC waveform indicating a set of RBs allocated for communication with a transmitting device and a CP ratio of a CP of the SC waveform, determine a set of REs of the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio, and receive the SC waveform including the CP from the transmitting device via the set of REs according to the CP ratio.

The network communication manager 1115 may manage communication with a core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1115 may manage the delivery of data communications for client devices (such as one or more UEs 115).

The transceiver 1120 may communicate bi-directionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 1120 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1120 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, as well as demodulate packets received from the antenna.

In some cases, device 1105 may include a single antenna 1125, or device 1105 may have more than one antenna 1125, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 1130 may include RAM, ROM, or a combination thereof. The memory 1130 may store computer readable code 1135 comprising instructions that, when executed by a processor (e.g., processor 1140), cause the device to perform various functions described herein. In some cases, memory 1130 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 1140 may comprise an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1140 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause apparatus 1105 to perform various functions (e.g., functions or tasks to support flexible SC waveforms).

The inter-station communication manager 1145 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with the other base stations 105. For example, the inter-station communication manager 1145 may coordinate scheduling of transmissions to the UEs 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-station communication manager 1145 may provide an X2 interface within LTE/LTE-a wireless communication network technology to provide communication between the base stations 105.

Code 1135 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. Code 1135 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, code 1135 may not be directly executable by processor 1140, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 12 shows a flow diagram illustrating a method 1200 of supporting flexible SC waveforms in accordance with aspects of the present disclosure. The operations of the method 1200 may be implemented by the UE 115 or the base station 105, or components thereof, as described herein. For example, the operations of method 1200 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1205, the UE or base station may identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the receiving device. The operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by the SC transmission configuration component as described with reference to fig. 7-11.

At 1210, the UE or base station may allocate a set of REs in the set of RBs based on the transmission configuration for the SC waveform, wherein the number of the set of REs is less than a total number of REs in the set of RBs. 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by an RE configuration component as described with reference to fig. 7-11.

At 1215, the UE or base station may transmit the SC waveform to the receiving device via the set of REs. The operations of 1215 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1215 may be performed by the SC transmission component as described with reference to fig. 7-11.

Fig. 13 shows a flow diagram illustrating a method 1300 of supporting flexible SC waveforms according to aspects of the present disclosure. The operations of the method 1300 may be implemented by the UE 115 or the base station 105, or components thereof, as described herein. For example, the operations of method 1300 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1305, the UE or base station may identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the receiving device. 1305 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1305 may be performed by an SC transmission configuration component as described with reference to fig. 7-11.

At 1310, the UE or base station may allocate a set of REs in the set of RBs based on the transmission configuration, where the number of sets of REs is less than the total number of REs in the set of RBs. 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by the RE configuration component as described with reference to fig. 7-11.

At 1305, the UE or the base station may determine a CP configuration for the SC waveform based on the transmission configuration, where the CP configuration indicates a first CP ratio of an initial symbol of the SC waveform and a second CP ratio, different from the first CP ratio, of one or more symbols following the initial symbol of the SC waveform. 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a CP determination component as described with reference to fig. 7-11.

At 1320, the UE or base station may transmit the SC waveform to the receiving device via the set of REs. 1320 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1320 may be performed by the SC transmission component as described with reference to fig. 7 through 11.

Fig. 14 shows a flow diagram illustrating a method 1400 of supporting flexible SC waveforms according to aspects of the present disclosure. The operations of the method 1400 may be implemented by the UE 115 or the base station 105, or components thereof, as described herein. For example, the operations of method 1400 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1405, the UE or base station may identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the transmitting device. 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by the SC transmission configuration component as described with reference to fig. 7-11.

At 1410, the UE or the base station may determine a set of REs in the set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs is less than a total number of REs in the set of RBs. 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by an RE configuration component as described with reference to fig. 7-11.

At 1415, the UE or base station may receive the SC waveform from the transmitting device via the set of REs. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operation of 1415 may be performed by the SC receiving component as described with reference to fig. 7-11.

Fig. 15 shows a flow diagram illustrating a method 1500 of supporting flexible SC waveforms in accordance with aspects of the present disclosure. The operations of method 1500 may be implemented by a UE 115 or a base station 105, or components thereof, as described herein. For example, the operations of method 1500 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1505, the UE or base station may identify a transmission configuration for the SC waveform indicating a set of RBs allocated for communication with the transmitting device. 1505 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1505 may be performed by the SC transmission configuration component as described with reference to fig. 7-11.

At 1510, the UE or the base station may determine a set of REs in the set of RBs for the SC waveform based on the transmission configuration, wherein the number of the set of REs is less than the total number of REs in the set of RBs. 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by the RE configuration component as described with reference to fig. 7-11.

At 1515, the UE or the base station may determine a CP configuration for the SC waveform based on the transmission configuration, wherein the CP configuration indicates a first CP ratio for an initial symbol of the SC waveform and a second CP ratio, different from the first CP ratio, for one or more symbols following the initial symbol of the SC waveform. 1515 the operations may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1515 may be performed by a CP determination component as described with reference to fig. 7-11.

At 1520, the UE or base station may receive the SC waveform from the transmitting device via the set of REs. 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by the SC receiving component as described with reference to fig. 7-11.

Fig. 16 shows a flow diagram illustrating a method 1600 of supporting flexible SC waveforms according to aspects of the present disclosure. The operations of method 1600 may be implemented by a UE 115 or a base station 105, or components thereof, as described herein. For example, the operations of method 1600 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1605, the UE or base station may identify a transmission configuration for the SC waveform indicating a CP ratio of a CP of the SC waveform and a set of RBs allocated for communication with the receiving device. 1605 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1605 may be performed by the SC transport configuration component as described with reference to fig. 7-11.

At 1610, the UE or the base station may allocate a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio. 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by the RE configuration component as described with reference to fig. 7-11.

At 1615, the UE or base station may transmit an SC waveform including the CP to the receiving device via the set of REs according to the CP ratio. 1615 may be performed according to the methods described herein. In some examples, aspects of the operation of 1615 may be performed by the SC transmission component as described with reference to fig. 7-11.

Fig. 17 shows a flow diagram illustrating a method 1700 of supporting flexible SC waveforms in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a UE 115 or a base station 105, or components thereof, as described herein. For example, the operations of method 1700 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1705, the UE or base station may identify a transmission configuration for the SC waveform indicating a CP ratio of a CP of the SC waveform and a set of RBs allocated for communication with the receiving device. 1705 may be performed according to the methods described herein. In some examples, aspects of the operation of 1705 may be performed by an SC transmission configuration component as described with reference to fig. 7-11.

At 1710, the UE or the base station may allocate a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by the RE configuration component as described with reference to fig. 7-11.

At 1715, the UE or base station may determine a CP configuration for the SC waveform based on the transmission configuration, wherein the CP configuration indicates a first CP ratio for an initial symbol of the SC waveform and a second CP ratio, different from the first CP ratio, for one or more symbols following the initial symbol of the SC waveform. 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by the CP determination component as described with reference to fig. 7-11.

At 1720, the UE or the base station may transmit an SC waveform including the CP to the receiver device via the set of REs according to the CP ratio. Operations of 1720 may be performed according to methods described herein. In some examples, aspects of the operations of 1720 may be performed by an SC transmission component as described with reference to fig. 7-11.

Fig. 18 shows a flow diagram illustrating a method 1800 of supporting flexible SC waveforms according to aspects of the present disclosure. The operations of method 1800 may be implemented by a UE 115 or a base station 105, or components thereof, as described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1805, the UE or base station may identify a transmission configuration for the SC waveform indicating a CP ratio of a CP of the SC waveform and a set of RBs allocated for communication with the transmitting device. 1805 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1805 may be performed by an SC transmission configuration component as described with reference to fig. 7 through 11.

At 1810, the UE or the base station may determine a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio. 1810 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1810 may be performed by the RE configuration component as described with reference to fig. 7-11.

At 1815, the UE or the base station may receive an SC waveform including the CP from the transmitting device via the RE set according to the CP ratio. 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by the SC receiving component as described with reference to fig. 7-11.

Fig. 19 shows a flow diagram illustrating a method 1900 of supporting flexible SC waveforms in accordance with aspects of the present disclosure. The operations of the method 1900 may be implemented by a UE 115 or a base station 105 or components thereof as described herein. For example, the operations of method 1900 may be performed by a communication manager as described with reference to fig. 7-11. In some examples, a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described herein. Additionally or alternatively, the UE or base station may use dedicated hardware to perform aspects of the functions described herein.

At 1905, the UE or base station may identify a transmission configuration for the SC waveform indicating a CP ratio of a CP of the SC waveform and a set of RBs allocated for communication with the transmitting device. 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by the SC transmission configuration component as described with reference to fig. 7-11.

At 1910, the UE or the base station may determine a set of REs in the set of RBs for the SC waveform including the CP based on the transmission configuration and the CP ratio. 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by the RE configuration component as described with reference to fig. 7-11.

At 1915, the UE or the base station may determine a CP configuration for the SC waveform based on the transmission configuration, where the CP configuration indicates a first CP ratio for an initial symbol of the SC waveform and a second CP ratio, different from the first CP ratio, for one or more symbols following the initial symbol of the SC waveform. 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by a CP determination component as described with reference to fig. 7-11.

At 1920, the UE or the base station may receive, from the transmitting device via the set of REs, an SC waveform including the CP according to the CP ratio. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed by the SC receiving component as described with reference to fig. 7-11.

It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more methods may be combined.

The techniques described herein may be used for various wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), SC frequency division multiple access (SC-FDMA), and others. A CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. The IS-2000 version may be generally referred to as CDMA 20001X, 1X, etc. IS-856(TIA-856) IS commonly referred to as CDMA 20001 xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes wideband CDMA (wcdma) and other variants of CDMA. TDMA systems may implement radio technologies such as global system for mobile communications (GSM).

The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), E-UTRA, Institute of Electrical and Electronics Engineers (IEEE)802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, LTE-A Pro, NR, and GSM are described in literature from an organization named "third Generation partnership project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the systems and radio technologies mentioned herein and for other systems and radio technologies. Although aspects of the LTE, LTE-A, LTE-A Pro or NR system may be described for exemplary purposes and LTE, LTE-A, LTE-A Pro or NR terminology may be used in much of the description, the techniques described herein may also be applied to applications other than LTE, LTE-A, LTE-A Pro or NR applications.

A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell may be associated with a lower power base station (as compared to a macro cell), and the small cell may operate in the same or a different (e.g., licensed, unlicensed, etc.) frequency band than the macro cell. According to various examples, a small cell may include a picocell, a femtocell, and a microcell. A picocell, for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femtocell may also cover a smaller geographic area (e.g., a residence) and may provide restricted access by UEs associated with the femtocell (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in the residence, etc.). The eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communication using one or more component carriers.

The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operations.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and the following claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard-wired, or any combination thereof. Features that implement functions may also be physically located at various locations, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media, including any medium that facilitates transfer of a computer program from one place to another. Non-transitory storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can comprise RAM, ROM, electrically erasable programmable ROM (eeprom), flash memory, Compact Disc (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes CD, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the herein are also included within the scope of computer-readable media.

As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items accompanied by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such that, for example, a list of at least one of A, B or C means a or B or C or AB or AC or BC or ABC (i.e., a and B and C). Also, as used herein, the phrase "based on" should not be read as referring to a closed condition set. For example, an exemplary step described as "based on condition a" may be based on both condition a and condition B without departing from the scope of the present disclosure. In other words, the phrase "based on," as used herein, should be interpreted in the same manner as the phrase "based, at least in part, on.

In the drawings, similar components or features may have the same reference numerals. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description may apply to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The illustrations set forth herein in connection with the figures describe example configurations and are not intended to represent all examples that may be implemented or fall within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration," and does not mean "preferred" or "advantageous over other examples. The detailed description includes specific details to provide an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

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