阅读说明：本技术 Papr和蜂窝小区间干扰减小 (PAPR and inter-cell interference reduction ) 是由 雷静 R·王 T·姬 J·B·索里亚加 Y·曹 S·朴 N·布衫 陈万士 P·盖尔 于 2019-02-13 设计创作，主要内容包括：本公开的各个方面一般涉及无线通信。在一些方面,用户装备可以：向数据集的调制码元集合应用一个或多个扩展序列以生成经扩展调制码元；向这些经扩展调制码元应用加扰序列以生成经加扰码元集合；以及传送至少部分地基于该经加扰码元集合的波形。提供了众多其他方面。(Various aspects of the present disclosure generally relate to wireless communications. In some aspects, the user equipment may: applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols; applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and transmitting a waveform based at least in part on the set of scrambled symbols. Numerous other aspects are provided.)

1. A method of wireless communication performed by a wireless communication device, comprising:

applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols;

applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and

transmitting a waveform based at least in part on the set of scrambled symbols.

2. The method of claim 1, wherein the scrambling sequence is based at least in part on the one or more spreading sequences.

3. The method of claim 1, wherein the one or more spreading sequences are applied using a hopping technique.

4. The method of claim 1, wherein the one or more spreading sequences are linear spreading sequences.

5. The method of claim 1, wherein the one or more spreading sequences are based, at least in part, on at least one of a Zadoff-Chu sequence, a Gold sequence, or an orthogonal cover code.

6. The method of claim 1, wherein the waveform is a cyclic prefix orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in a frequency domain.

7. The method of claim 1, wherein the waveform is a discrete fourier transform spread orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in the time domain.

8. The method of claim 1, wherein the data set is associated with a data transmission.

9. The method of claim 1, wherein the data set is associated with a control transmission.

10. The method of claim 1, wherein the data set is associated with at least one of:

the reference signal is demodulated and the reference signal is demodulated,

positioning reference signals, or

A reference signal is probed.

11. The method of claim 1, wherein the waveform is associated with multi-user multiple-input multiple-output communication.

12. The method of claim 1, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio of the waveform.

13. The method of claim 1, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio and inter-cell interference of the waveform.

14. The method of claim 1, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.

15. The method of claim 14, wherein the one or more spreading sequences are applied using a cell-specific hopping pattern.

16. The method of claim 14, wherein the one or more spreading sequences are generated based at least in part on partitioning a subset of a spreading codebook.

17. The method of claim 14, wherein the scrambling sequence is applied using at least one of cell-specific scrambling or symbol-level scrambling.

18. The method of claim 1, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.

19. A wireless communication device for wireless communication, comprising:

a memory; and

one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:

applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols;

applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and

transmitting a waveform based at least in part on the set of scrambled symbols.

20. The wireless communications apparatus of claim 19, wherein the scrambling sequence is based at least in part on the one or more spreading sequences.

21. The wireless communication device of claim 19, wherein the one or more spreading sequences are applied using a hopping technique.

22. The wireless communications device of claim 19, wherein the one or more spreading sequences are linear spreading sequences.

23. The wireless communications apparatus of claim 19, wherein the one or more spreading sequences are based at least in part on at least one of a Zadoff-Chu sequence, a Gold sequence, or an orthogonal cover code.

24. The wireless communications apparatus of claim 19, wherein the waveform is a cyclic prefix orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in a frequency domain.

25. The wireless communication device of claim 19, wherein the waveform is a discrete fourier transform spread orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in the time domain.

26. The wireless communication device of claim 19, wherein the set of data is associated with a data transmission.

27. The wireless communication device of claim 19, wherein the set of data is associated with a control transmission.

28. The wireless communications device of claim 19, wherein the data set is associated with at least one of:

the reference signal is demodulated and the reference signal is demodulated,

positioning reference signals, or

A reference signal is probed.

29. The wireless communication device of claim 19, wherein the waveform is associated with multi-user multiple-input multiple-output communication.

30. The wireless communications apparatus of claim 19, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio of the waveform.

31. The wireless communications apparatus of claim 19, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio and an inter-cell interference of the waveform.

32. The wireless communications apparatus of claim 19, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.

33. The wireless communications apparatus of claim 32, wherein the one or more spreading sequences are applied using a cell-specific hopping pattern.

34. The wireless communications apparatus of claim 32, wherein the one or more spreading sequences are generated based at least in part on partitioning a subset of a spreading codebook.

35. The wireless communications apparatus of claim 32, wherein the scrambling sequence is applied using at least one of cell-specific scrambling or symbol-level scrambling.

36. The wireless communications apparatus of claim 19, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.

37. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a wireless communication device, cause the one or more processors to:

applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols;

applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and

transmitting a waveform based at least in part on the set of scrambled symbols.

38. An apparatus for wireless communication, comprising:

means for applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols;

means for applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and

means for transmitting a waveform based at least in part on the set of scrambled symbols.

39. The apparatus of claim 38, wherein the scrambling sequence is based at least in part on the one or more spreading sequences.

40. The apparatus of claim 38, wherein the one or more spreading sequences are applied using a hopping technique.

41. The apparatus of claim 38, wherein the one or more spreading sequences are linear spreading sequences.

42. The apparatus of claim 38, wherein the one or more spreading sequences are based, at least in part, on at least one of a Zadoff-Chu sequence, a Gold sequence, or an orthogonal cover code.

43. The apparatus of claim 38, wherein the waveform is a cyclic prefix orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in a frequency domain.

44. The apparatus of claim 38, wherein the waveform is a discrete fourier transform spread orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in the time domain.

45. The apparatus of claim 38, wherein the data set is associated with a data transmission.

46. The apparatus of claim 38, wherein the data set is associated with a control transmission.

47. The apparatus of claim 38, wherein the data set is associated with at least one of:

the reference signal is demodulated and the reference signal is demodulated,

positioning reference signals, or

A reference signal is probed.

48. The apparatus of claim 38, wherein the waveform is associated with multi-user multiple-input multiple-output communication.

49. The apparatus of claim 38, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio of the waveform.

50. The apparatus of claim 38, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio and inter-cell interference of the waveform.

51. The apparatus of claim 38, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.

52. The apparatus of claim 51, wherein the one or more spreading sequences are applied using a cell-specific hopping pattern.

53. The apparatus of claim 51, wherein the one or more spreading sequences are generated based at least in part on partitioning a subset of a spreading codebook.

54. The apparatus of claim 51, wherein the scrambling sequence is applied using at least one of cell-specific scrambling or symbol-level scrambling.

55. The apparatus of claim 38, wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-advanced is an enhanced set of Universal Mobile Telecommunications System (UMTS) mobile standards promulgated by the third generation partnership project (3 GPP).

A wireless communication network may include a number of Base Stations (BSs) capable of supporting communication for a number of User Equipments (UEs). A User Equipment (UE) may communicate with a Base Station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in greater detail herein, a BS may be referred to as a node B, a gNB, an Access Point (AP), a radio head, a Transmission Reception Point (TRP), a New Radio (NR) BS, a 5G B node, and so on.

The above multiple access techniques have been adopted in various telecommunications standards to provide a common protocol that enables different user equipment to communicate on a city, country, region, and even global level. New Radios (NR), which may also be referred to as 5G, are an enhanced set of LTE mobile standards promulgated by the third generation partnership project (3 GPP). NR is designed to better support mobile broadband internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with the use of Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) (CP-OFDM) on the Downlink (DL), the use of CP-OFDM and/or SC-FDM on the Uplink (UL) (e.g., also known as discrete fourier transform spread OFDM (DFT-s-OFDM), and other open standards that support beamforming, Multiple Input Multiple Output (MIMO) antenna technology, and carrier aggregation.

SUMMARY

Some of the techniques and apparatus (equipment) described herein provide for reduction of PAPR of CP-OFDM waveforms when linear spreading or cover codes (e.g., orthogonal cover codes) are applied in the frequency domain. In this case, a joint design of spreading and scrambling codes may be applied at the modulation symbol level, as described herein. Furthermore, in some cases, the spreading codes may be applied using a hopping pattern. Some of the techniques and apparatus (equipment) described herein provide for PAPR reduction of DFT-s-OFDM waveforms when applying linear spreading or cover codes in the time domain. In this case, a joint design of spreading and scrambling codes may be applied at the modulation symbol level, as described herein. Furthermore, in some cases, the spreading codes may be applied using a hopping pattern. Some techniques and devices (apparatus) described herein provide for reduced inter-cell interference for uplink transmissions (e.g., grant-less transmissions or grant-based transmissions) when multiple cells share the same codebook for linear spreading or orthogonal cover coding. For example, some techniques and apparatus (equipment) described herein may use cell-specific modulation symbol level scrambling. As another example, some techniques and apparatus (devices) described herein may use partitioning of subsets of a linear expansion codebook. As yet another example, some techniques and apparatus (equipment) described herein may use cell-specific hopping of spreading codes. In general, the techniques and apparatus (equipment) may be applied to multi-user (MU) multiple-input multiple-output (MIMO) (e.g., for demodulation reference signals (DMRS), Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), etc.), Positioning Reference Signals (PRS), Sounding Reference Signals (SRS), or another type of uplink or downlink wireless communication. The techniques and apparatus (equipment) described herein are applicable to NOMA as well as OMA.

Some described techniques relate to improved methods, systems, devices, or apparatuses (equipment) that support peak-to-average power ratio (PAPR) reduction and inter-cell interference management. In general, the described technology provides a User Equipment (UE) that communicates with a base station using non-orthogonal multiple access (NOMA) uplink transmissions having a discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. The UE may perform a NOMA DFT-s-OFDM waveform generation procedure that includes cell-specific or symbol-specific time domain spreading. For example, the UE may identify a vector of data symbols for uplink transmission and may perform UE-specific spreading or scrambling of the vector of data symbols. The UE converts this spread vector into a set of time domain symbols and may apply a scrambling vector to these time domain symbols to reduce PAPR and inter-cell interference. In some cases, UE-specific spreading or scrambling may induce PAPR degradation (e.g., higher PAPR), which may be mitigated by cell-specific or symbol-specific scrambling. The UE may perform the scrambling in the time domain using a scrambling vector generated based on a cell identifier, a symbol index, a scrambling vector length, or some combination of these parameters. The UE may then perform a transform (e.g., DFT, Inverse Fast Fourier Transform (IFFT), or both) on the set of spread time domain symbols to generate a NOMA DFT-s-OFDM waveform for uplink transmission.

In some aspects, a method for wireless communication may comprise: applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols; applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and transmitting a waveform based at least in part on the set of scrambled symbols.

In some aspects, a wireless communication device for wireless communication may comprise: one or more processors configured to: applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols; applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and transmitting a waveform based at least in part on the set of scrambled symbols.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of the user equipment, may cause the one or more processors to: applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols; applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and transmitting a waveform based at least in part on the set of scrambled symbols.

In some aspects, an apparatus for wireless communication may comprise: means for applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols; means for applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and means for transmitting a waveform based at least in part on the set of scrambled symbols.

In some aspects, a method for wireless communication may comprise: processing a data stream associated with non-orthogonal multiple access with resource spreading based at least in part on a codebook of spreading sequences, the codebook being adjusted using a cell-specific mask sequence; or precoding a block of the data stream using a cell-specific precoding sequence; and transmitting the data stream after processing the data stream based at least in part on the codebook adjusted using the cell-specific masking sequence or after precoding the block of the data stream using the cell-specific precoding sequence.

In some aspects, a user equipment for wireless communication may comprise: one or more processors configured to: processing a data stream associated with non-orthogonal multiple access with resource spreading based at least in part on a codebook of spreading sequences, the codebook being adjusted using a cell-specific mask sequence; or precoding a block of the data stream using a cell-specific precoding sequence; and transmitting the data stream after processing the data stream based at least in part on the codebook adjusted using the cell-specific masking sequence or after precoding the block of the data stream using the cell-specific precoding sequence.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of the user equipment, may cause the one or more processors to: processing a data stream associated with non-orthogonal multiple access with resource spreading based at least in part on a codebook of spreading sequences, the codebook being adjusted using a cell-specific mask sequence; or precoding a block of the data stream using a cell-specific precoding sequence; and transmitting the data stream after processing the data stream based at least in part on the codebook adjusted using the cell-specific masking sequence or after precoding the block of the data stream using the cell-specific precoding sequence.

In some aspects, an apparatus for wireless communication may comprise: means for processing a data stream associated with non-orthogonal multiple access with resource spreading based at least in part on a codebook of spreading sequences, the codebook adjusted using a cell-specific mask sequence; or means for precoding blocks of the data stream using a cell-specific precoding sequence; and means for transmitting the data stream after processing the data stream based at least in part on the codebook adjusted using the cell-specific masking sequence or after precoding the block of the data stream using the cell-specific precoding sequence.

A method of wireless communication at a UE is described. The method can comprise the following steps: the method includes identifying a vector of data symbols for uplink transmission on a set of frequency resources in one or more symbol periods, applying a UE-specific signature sequence to the vector of data symbols in a time domain to obtain a vector of spread data symbols, and dividing the vector of spread data symbols into a plurality of sets of time domain symbols, wherein each set of the plurality of sets of time domain symbols has a length equal to a first number of frequency resources of the set of frequency resources. The method may further comprise: the method may include applying a scrambling vector to each of the sets of time domain symbols, performing a respective time-to-frequency domain transform on the sets of time domain symbols to obtain a plurality of frequency domain signals, mapping the plurality of frequency domain signals to the set of frequency resources, generating a time domain waveform for the uplink transmission based on the frequency-to-time domain transform of the plurality of frequency domain signals mapped to the set of frequency resources, and transmitting the time domain waveform to a receiver.

An apparatus for wireless communication at a UE is described. The apparatus may include: the apparatus generally includes means for identifying a vector of data symbols for uplink transmission on a set of frequency resources in one or more symbol periods, means for applying a UE-specific signature sequence to the vector of data symbols in a time domain to obtain a vector of spread data symbols, and means for dividing the vector of spread data symbols into a plurality of sets of time domain symbols, wherein each set of the plurality of sets of time domain symbols has a length equal to a first number of frequency resources of the set of frequency resources. The apparatus may further comprise: the apparatus generally includes means for applying a scrambling vector to each of the plurality of sets of time domain symbols, means for performing a respective time-to-frequency domain transform on the plurality of sets of time domain symbols to obtain a plurality of frequency domain signals, means for mapping the plurality of frequency domain signals to the set of frequency resources, means for generating a time domain waveform for the uplink transmission based on the frequency-to-time domain transform of the plurality of frequency domain signals mapped to the set of frequency resources, and means for transmitting the time domain waveform to a receiver.

Another apparatus for wireless communication at a UE 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 operable to cause the processor to: the method includes identifying a vector of data symbols for uplink transmission on a set of frequency resources in one or more symbol periods, applying a UE-specific signature sequence to the vector of data symbols in a time domain to obtain a vector of spread data symbols, and dividing the vector of spread data symbols into a plurality of sets of time domain symbols, wherein each set of the plurality of sets of time domain symbols has a length equal to a first number of frequency resources of the set of frequency resources. The instructions are further operable to cause the processor to: the method may include applying a scrambling vector to each of the sets of time domain symbols, performing a respective time-to-frequency domain transform on the sets of time domain symbols to obtain a plurality of frequency domain signals, mapping the plurality of frequency domain signals to the set of frequency resources, generating a time domain waveform for the uplink transmission based on the frequency-to-time domain transform of the plurality of frequency domain signals mapped to the set of frequency resources, and transmitting the time domain waveform to a receiver.

A non-transitory computer-readable medium for wireless communication at a UE is described. The non-transitory computer-readable medium may include instructions operable to cause a processor to: the method includes identifying a vector of data symbols for uplink transmission on a set of frequency resources in one or more symbol periods, applying a UE-specific signature sequence to the vector of data symbols in a time domain to obtain a vector of spread data symbols, and dividing the vector of spread data symbols into a plurality of sets of time domain symbols, wherein each set of the plurality of sets of time domain symbols has a length equal to a first number of frequency resources of the set of frequency resources. The instructions are further operable to cause the processor to: the method may include applying a scrambling vector to each of the sets of time domain symbols, performing a respective time-to-frequency domain transform on the sets of time domain symbols to obtain a plurality of frequency domain signals, mapping the plurality of frequency domain signals to the set of frequency resources, generating a time domain waveform for the uplink transmission based on the frequency-to-time domain transform of the plurality of frequency domain signals mapped to the set of frequency resources, and transmitting the time domain waveform to a receiver.

In some aspects, a method for performing wireless communication by a User Equipment (UE) may comprise: selecting a hopping pattern for a data stream for which a spreading technique is to be performed using short codes, wherein the hopping pattern is directed to spreading sequence selection, ordering, and concatenation in the time domain; and processing the data stream based at least in part on the hopping pattern.

In some aspects, a user equipment for wireless communication may comprise: one or more processors configured to: selecting a hopping pattern for a data stream for which a spreading technique is to be performed using short codes, wherein the hopping pattern is directed to spreading sequence selection, ordering, and concatenation in the time domain; and processing the data stream based at least in part on the hopping pattern.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of the user equipment, may cause the one or more processors to: selecting a hopping pattern for a data stream for which a spreading technique is to be performed using short codes, wherein the hopping pattern is directed to spreading sequence selection, ordering, and concatenation in the time domain; and processing the data stream based at least in part on the hopping pattern.

In some aspects, an apparatus for wireless communication may comprise: means for selecting a hopping pattern for a data stream for which a spreading technique is to be performed using short codes, wherein the hopping pattern is directed to spreading sequence selection, ordering, and concatenation in the time domain; and means for processing the data stream based at least in part on the hopping pattern.

Aspects generally include methods, apparatuses (devices), systems, computer program products, non-transitory computer-readable media, user equipment, wireless communication devices, and processing systems substantially as described herein with reference to and as illustrated by the accompanying drawings and description.

The foregoing has outlined rather broadly the features and technical advantages of an example in accordance with the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, both as to their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description and does not define the limits of the claims.