Uplink and downlink grants for narrowband operation
阅读说明:本技术 用于窄带操作的上行链路和下行链路授权 (Uplink and downlink grants for narrowband operation ) 是由 魏超 K·巴塔德 徐浩 A·里科阿尔瓦里尼奥 于 2018-07-25 设计创作,主要内容包括:本公开内容的各方面提供了用于无线通信的技术和装置。在一方面,提供了一种方法,该方法可以由诸如用户设备(UE)的无线设备执行,该无线设备可以是物联网(IoT)设备。该方法大致包括:针对上行链路(UL)或下行链路(DL)授权而监视系统带宽的窄带中的控制信道,接收交织的UL和DL授权,以及响应于所接收的交织的UL和DL授权来发送或接收信息。(Aspects of the present disclosure provide techniques and apparatuses for wireless communication. In an aspect, a method is provided that may be performed by a wireless device, such as a User Equipment (UE), which may be an internet of things (IoT) device. The method generally comprises: the method includes monitoring a control channel in a narrow band of system bandwidth for an Uplink (UL) or Downlink (DL) grant, receiving interleaved UL and DL grants, and transmitting or receiving information in response to the received interleaved UL and DL grants.)
1. A method for wireless communications by a User Equipment (UE), comprising:
monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
receiving interleaved UL and DL grants; and
information is transmitted or received in response to the received interleaved UL and DL grants.
2. The method of claim 1, wherein receiving the interleaved UL and DL grants comprises at least one of: a DL grant is received as a next grant after a UL grant, or a UL grant is received as a next grant after a DL grant.
3. The method of claim 1, wherein the interleaved UL and DL grants are received before a start of the transmitting or receiving information in response to the interleaved UL and DL grants.
4. The method of claim 1, wherein the UE monitors a control channel search space and receives a DL grant as a next grant after the UL grant and after a start of the transmission of information on an uplink data channel in response to the UL grant.
5. The method of claim 4, wherein the uplink data channel is on a different carrier than the control channel search space.
6. The method of claim 4, wherein a subframe after a subframe in which the UE transmits information on the UL data channel and before a subframe for DL communication is used as a guard subframe.
7. The method of claim 6, wherein communications associated with the protected subframe are deferred to a next available subframe.
8. The method of claim 1, wherein each of the interleaved UL and DL grants supports one or more hybrid automatic repeat request (HARQ) processes.
9. The method of claim 8, wherein each of the interleaved UL and DL grants supports two HARQ processes.
10. The method of claim 8, wherein the UE indicates support for at least one of:
two HARQ processes for each UL or DL grant, or interleaving of UL and DL grants.
11. The method of claim 1, further comprising:
identifying a collision in response to the transmitting or receiving information in response to the received interleaved UL and DL grants, the collision comprising at least one of:
a collision between the UL data channel and the DL data channel, or
Collision between UL data channel and hybrid ARQ acknowledgement (HARQ-ACK) signaling.
12. The method of claim 11, wherein the HARQ-ACK signaling comprises an acknowledgement or Negative Acknowledgement (NACK), and wherein the HARQ-ACK signaling is for the DL data channel.
13. The method of claim 11, wherein the collision comprises the collision between the UL data channel and the DL data channel, the method further comprising at least one of:
determining to use one of the UL data channel and the DL data channel, or
For a subframe that collides between the UL data channel and the DL data channel, determining the subframe that uses one of the UL data channel and the DL data channel.
14. The method of claim 13, wherein the determining to use is based at least in part on an energy metric threshold.
15. The method of claim 12, wherein the collision comprises a collision between the UL data channel and the HARQ-ACK signaling, the method further comprising at least one of:
determining to transmit the HARQ-ACK signaling or to multiplex the HARQ-ACK signaling with the UL data channel for subframes that collide between the UL data channel and the HARQ-ACK signaling.
16. The method of claim 15, wherein the multiplexing the HARQ-ACK signaling with the UL data channel comprises: modulating a demodulation reference signal (DMRS) of the UL data channel with the HARQ-ACK signaling for subframes that collide between the UL data channel and the HARQ-ACK signaling.
17. The method of claim 1, wherein the UE is configured for narrowband internet of things (NB-IoT).
18. The method of claim 1, wherein the UE is configured for Time Division Duplex (TDD) operation.
19. The method of claim 1, wherein the UE is configured for Frequency Division Duplex (FDD) operation.
20. The method of claim 1, wherein the control channel comprises a Narrowband Physical Downlink Control Channel (NPDCCH).
21. The method of claim 1, wherein the sending information comprises: transmitting information in an uplink data channel in response to the received UL grant; and wherein the receiving information comprises receiving information in a downlink data channel in response to the DL grant.
22. The method of claim 1, wherein the uplink data channel comprises a Narrowband Physical Uplink Shared Channel (NPUSCH), and wherein the downlink data channel comprises a Narrowband Physical Downlink Shared Channel (NPDSCH).
23. The method of claim 11, wherein the DL data channel comprises a Narrowband Physical Downlink Shared Channel (NPDSCH), the HARQ-ACK comprises a hybrid automatic repeat request (HARQ) acknowledgement or negative acknowledgement, and the UL data channel comprises a Narrowband Physical Uplink Shared Channel (NPUSCH).
24. A method for wireless communications by a User Equipment (UE), comprising:
monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
receiving two consecutive UL or DL grants, wherein the consecutive UL or DL grants have a same HARQ process Identification (ID); and
selecting one of the authorizations to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The authorization of the second one of the received,
or choose to use two grants, wherein the grants are considered as hybrid automatic repeat request (HARQ) retransmissions.
25. The method of claim 24, wherein receiving two consecutive UL or DL grants comprises at least one of:
receiving one UL grant after one UL grant as a next grant; or
One DL grant is received as a next grant after the one DL grant.
26. The method of claim 24, wherein the UE is configured for narrowband internet of things (NB-IoT).
27. The method of claim 24, wherein the control channel comprises a Narrowband Physical Downlink Control Channel (NPDCCH).
28. A method for wireless communications by a User Equipment (UE), comprising:
monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
receiving two consecutive UL or DL grants;
transmitting or receiving information in response to the received two consecutive UL and DL grants; and
in response to the sending or receiving information, identifying a conflict, the conflict comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel.
29. The method of claim 28, wherein receiving two consecutive UL or DL grants comprises at least one of:
receiving one UL grant after one UL grant as a next grant; or
One DL grant is received as a next grant after the one DL grant.
30. The method of claim 28, wherein the collision comprises a collision between the first DL data channel and the second DL data channel, the method further comprising at least one of:
selecting only one of the first DL data channel or the second DL data channel for monitoring; or
Selecting only one of the first DL data channel or the second DL data channel for monitoring for subframes that collide between the first DL data channel and the second DL data channel.
31. The method of claim 30, wherein the selecting comprises:
selecting the first DL data channel signaling;
selecting the second DL data channel signaling; or
Selecting the first or second DL data channel signaling based at least in part on an energy metric threshold.
32. The method of claim 28, wherein the collision comprises a collision between the second DL data channel and the first HARQ-ACK signaling for the first DL data channel, the method further comprising at least one of: determining not to use the first HARQ-ACK signaling; or determining not to use the second DL data channel.
33. The method of claim 32, wherein the determining not to use the first HARQ-ACK signaling comprises: determining not to use all subframes for the first HARQ-ACK signaling or only subframes for the first HARQ-ACK signaling that collide with the second DL data channel.
34. The method of claim 32, wherein the determining not to use the second DL data channel comprises: determining not to use all subframes for the second DL data channel or only subframes for the second DL data channel that collide with the first HARQ-ACK signaling.
35. The method of claim 28, wherein colliding subframes comprise at least one of: a subframe for ACK, a subframe for DL data channel, or a guard subframe.
36. The method of claim 28, wherein the collision comprises a collision between the first HARQ-ACK signaling for the first DL data channel and the second HARQ-ACK signaling for the second DL data channel, the method further comprising at least one of:
transmitting one of the first HARQ-ACK signaling or the second HARQ-ACK signaling, or
Transmitting one of the first HARQ-ACK signaling or the second HARQ-ACK signaling and puncturing the other of the first HARQ-ACK signaling or the second HARQ-ACK signaling.
37. The method of claim 36, wherein only one of the first DL data channel and the second DL data channel is successfully decoded, the method further comprising: transmitting a HARQ-ACK for the one of the first DL data channel and the second DL data channel that was successfully decoded; and puncturing the HARQ-ACK for the other of the first DL data channel signaling and the second DL data channel signaling.
38. The method of claim 28, wherein the collision comprises a collision between the first UL data channel and the second UL data channel, the method further comprising at least one of:
determining to transmit one of the first UL data channel and the second UL data channel, or
Determining to transmit one of the first and second UL data channels and puncturing the other of the first and second UL data channels.
39. The method of claim 38, wherein the step of determining a transmission or puncturing is based at least in part on an energy metric threshold.
40. The method of claim 28, wherein the DL data channel comprises a Narrowband Physical Downlink Shared Channel (NPDSCH), the HARQ-ACK comprises a hybrid automatic repeat request (HARQ) acknowledgement or negative acknowledgement, and the UL data channel comprises a Narrowband Physical Uplink Shared Channel (NPUSCH).
41. The method of claim 28, wherein the UE is configured for narrowband internet of things (NB-IoT).
42. The method of claim 28, wherein the control channel comprises a Narrowband Physical Downlink Control Channel (NPDCCH), the first DL data channel and the second DL data channel comprise NPDSCH, and the first UL data channel and the second UL data channel comprise NPUSCH.
43. A method of wireless communication by a Base Station (BS), comprising:
transmitting interleaved Uplink (UL) and Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth; and
receiving information from or transmitting information to the UE in response to the transmitted interleaved UL and DL grants.
44. A method of wireless communication by a Base Station (BS), comprising:
transmitting two consecutive Uplink (UL) or Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth, the consecutive UL or DL grants having a same HARQ process Identification (ID), wherein:
selecting, by the UE, one of the grants to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The authorization of the second one of the received,
or two grants are selected for use by the UE, wherein the grants are considered hybrid automatic repeat request (HARQ) retransmissions.
45. A method of wireless communication by a Base Station (BS), comprising:
transmitting two consecutive UL or DL grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth;
transmitting or receiving information in response to the transmitted two consecutive UL and DL grants; and
in response to the sending or receiving information, identifying a conflict comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel.
46. An apparatus for wireless communications by a User Equipment (UE), comprising:
means for monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
means for receiving interleaved UL and DL grants; and
means for transmitting or receiving information in response to the received interleaved UL and DL grants.
47. An apparatus for wireless communications by a User Equipment (UE), comprising:
means for monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
means for receiving two consecutive UL or DL grants, wherein the consecutive UL or DL grants have a same HARQ process Identification (ID); and
a unit for:
selecting one of the authorizations to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The authorization of the second one of the received,
or choose to use two grants, wherein the grants are considered as hybrid automatic repeat request (HARQ) retransmissions.
48. An apparatus for wireless communications by a User Equipment (UE), comprising:
means for monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
means for receiving two consecutive UL or DL grants;
means for transmitting or receiving information in response to the received two consecutive UL and DL grants; and
means for identifying a collision in response to the sending or receiving information, the collision comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel.
49. An apparatus for wireless communications by a Base Station (BS), comprising:
means for transmitting interleaved Uplink (UL) and Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth; and
means for receiving information from or transmitting information to the UE in response to the transmitted interleaved UL and DL grants.
50. An apparatus for wireless communications by a Base Station (BS), comprising:
means for transmitting two consecutive Uplink (UL) or Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth, the consecutive UL or DL grants having a same HARQ process Identification (ID), wherein:
selecting, by the UE, one of the grants to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The authorization of the second one of the received,
or two grants are selected for use by the UE, wherein the grants are considered hybrid automatic repeat request (HARQ) retransmissions.
51. An apparatus for wireless communications by a Base Station (BS), comprising:
means for transmitting two consecutive UL or DL grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth;
means for transmitting or receiving information in response to the transmitted two consecutive UL and DL grants; and
means for identifying, in response to the sending or receiving information, a collision comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel
A collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel.
52. An apparatus for wireless communications by a User Equipment (UE), comprising:
one or more processors configured to:
monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
receiving interleaved UL and DL grants; and
transmitting or receiving information in response to the received interleaved UL and DL grants; and
a memory coupled to the one or more processors.
53. An apparatus for wireless communications by a User Equipment (UE), comprising:
one or more processors configured to:
monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
receiving two consecutive UL or DL grants, wherein the consecutive UL or DL grants have a same HARQ process Identification (ID); and
selecting one of the authorizations to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The authorization of the second one of the received,
or choose to use two grants, wherein the grants are considered hybrid automatic repeat request (HARQ) retransmissions; and
a memory coupled to the one or more processors.
54. An apparatus for wireless communications by a User Equipment (UE), comprising:
one or more processors configured to:
monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
receiving two consecutive UL or DL grants;
transmitting or receiving information in response to the received two consecutive UL and DL grants; and
identifying a collision in response to the sending or receiving information, the collision comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel; and a memory coupled to the one or more processors.
55. An apparatus for wireless communications by a Base Station (BS), comprising:
one or more processors configured to:
transmitting interleaved Uplink (UL) and Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth; and
receiving or transmitting information from or to the UE in response to the transmitted interleaved UL and DL grants; and
a memory coupled to the one or more processors.
56. An apparatus for wireless communications by a Base Station (BS), comprising:
one or more processors configured to:
transmitting two consecutive Uplink (UL) or Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth, the consecutive UL or DL grants having a same HARQ process Identification (ID), wherein:
selecting, by the UE, one of the grants to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The authorization of the second one of the received,
or selecting two grants for use by the UE, wherein the grants are considered hybrid automatic repeat request (HARQ) retransmissions; and
a memory coupled to the one or more processors.
57. An apparatus for wireless communications by a Base Station (BS), comprising:
one or more processors configured to:
transmitting two consecutive UL or DL grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth;
transmitting or receiving information in response to the transmitted two consecutive UL and DL grants; and
in response to the sending or receiving information, identifying a conflict comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel; and
a memory coupled to the one or more processors.
58. A computer-readable medium having executable code stored thereon for wireless communications by a User Equipment (UE), the executable code comprising:
code for monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
code for receiving interleaved UL and DL grants; and
code for transmitting or receiving information in response to the received interleaved UL and DL grants.
59. A computer-readable medium having executable code stored thereon for wireless communications by a User Equipment (UE), the executable code comprising:
code for monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
code for receiving two consecutive UL or DL grants, wherein the consecutive UL or DL grants have a same HARQ process Identification (ID); and
code for:
selecting one of the authorizations to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
The second received grant, or alternatively both grants, wherein the grant is considered a hybrid automatic repeat request (HARQ) retransmission.
60. A computer-readable medium having executable code stored thereon for wireless communications by a User Equipment (UE), the executable code comprising:
code for monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant;
code for receiving two consecutive UL or DL grants;
code for transmitting or receiving information in response to the received two consecutive UL and DL grants; and
code for identifying a collision in response to the sending or receiving information, the collision comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel.
61. A computer readable medium having executable code stored thereon for wireless communications by a Base Station (BS), the executable code comprising:
code for transmitting interleaved Uplink (UL) and Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth; and
code for receiving information from or transmitting information to the UE in response to the transmitted interleaved UL and DL grants.
62. A computer readable medium having executable code stored thereon for wireless communications by a Base Station (BS), the executable code comprising:
code for transmitting two consecutive Uplink (UL) or Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth, the consecutive UL or DL grants having a same HARQ process Identification (ID), wherein:
selecting, by the UE, one of the grants to use based at least in part on at least one of:
the grant to satisfy the energy metric threshold is,
authorization received first, or
A second received grant, or two grants selected for use by the UE, wherein the grant is considered a hybrid automatic repeat request (HARQ) retransmission.
63. A computer readable medium having executable code stored thereon for wireless communications by a Base Station (BS), the executable code comprising:
code for transmitting two consecutive UL or DL grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth;
code for transmitting or receiving information in response to the transmitted two consecutive UL and DL grants; and
code for identifying, in response to the sending or receiving information, a collision comprising at least one of:
a collision between the first DL data channel and the second DL data channel,
a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel,
a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or
A collision between the first UL data channel and the second UL data channel.
Technical Field
Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to Uplink (UL) and Downlink (DL) grants for narrowband operation.
Background
Wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). 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, third generation partnership project (3GPP) Long Term Evolution (LTE)/LTE-advanced (LTE-a) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems.
Generally, a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals. Each terminal communicates with one or more Base Stations (BSs) through transmissions on forward and reverse links. The forward link (or downlink) refers to the communication link from the BS to the terminals, and the reverse link (or uplink) refers to the communication link from the terminals to the BS. The communication link may be established by a single-input single-output, multiple-input single-output or multiple-input multiple-output (MIMO) system.
A wireless communication network may include multiple BSs that may support communication for multiple wireless devices. The wireless device may include a User Equipment (UE). Machine Type Communication (MTC) may refer to communication involving at least one remote device on at least one end of the communication and may include forms of data communication involving one or more entities that do not necessarily require human interaction. For example, the mtciue may include a UE capable of MTC communication with an MTC server and/or other MTC devices through a Public Land Mobile Network (PLMN). The wireless devices may include internet of things (IoT) devices (e.g., narrowband IoT (NB-IoT) devices). An IoT may refer to a network of physical objects, devices, or "things". IoT devices may be embedded with, for example, electronic devices, software, or sensors, and may have network connectivity that enables the devices to collect and exchange data.
Some next generation, NR, or 5G networks may include multiple base stations, each supporting communication for multiple communication devices (e.g., UEs) simultaneously. In an LTE or LTE-a network, a set of one or more BSs may define an enodeb (enb). In other examples (e.g., in a next generation or 5G network), a wireless multiple-access communication system may include a plurality of distributed units (e.g., Edge Units (EUs), Edge Nodes (ENs), Radio Heads (RHs), intelligent radio heads (SRHs), Transmission Reception Points (TRPs), etc.) in communication with a plurality of central units (e.g., CUs, Central Nodes (CNs), Access Node Controllers (ANCs), etc.), wherein a set of one or more Distributed Units (DUs) in communication with a CU may define AN access node (e.g., AN, a new radio base station (NR BS), NR NB, network node, gNB, 5G BS, Access Point (AP), etc.). A BS or DU may communicate with a set of UEs on a downlink channel (e.g., for transmissions from the BS or to the UEs) and an uplink channel (e.g., for transmissions from the UEs to the BS or DU).
These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate on a city, country, region, or even global level. NR (e.g., 5G radio access) is an example of an emerging telecommunications standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3 GPP. NR aims to better support mobile broadband internet access, and support beamforming, MIMO antenna technology, and carrier aggregation by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with Cyclic Prefix (CP) on Downlink (DL) and Uplink (UL).
However, as the demand for mobile broadband access continues to increase, there is a demand for further improvements in LTE, MTC, IoT and NR (new radio) technologies. Preferably, these improvements should be applicable to other multiple access techniques and telecommunication standards using these techniques.
Disclosure of Invention
The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed by the claims that follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled "detailed description" one will understand how the features of this disclosure provide advantages that include improved communications between access points and stations in a wireless network.
Certain aspects of the present disclosure generally relate to uplink and downlink operations for narrowband operations.
Certain aspects of the present disclosure provide a method performed by a wireless device, such as a User Equipment (UE). The method generally comprises: monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant; receiving interleaved UL and DL grants; and transmitting or receiving information in response to the received interleaved UL and DL grants.
Certain aspects of the present disclosure provide a method performed by a wireless device, such as a UE. The method generally comprises: monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant; receiving two consecutive UL or DL grants, wherein the consecutive UL or DL grants have the same HARQ process Identification (ID); and selecting one of the authorizations to use based at least in part on at least one of: a grant that satisfies an energy metric threshold, either a first received grant, or a second received grant, or an option to use both grants, wherein the grant is considered a hybrid automatic repeat request (HARQ) retransmission.
Certain aspects of the present disclosure provide a method performed by a wireless device, such as a UE. The method generally comprises: monitoring a control channel in a narrow band of a system bandwidth for an Uplink (UL) or Downlink (DL) grant; receiving two consecutive UL or DL grants; transmitting or receiving information in response to the received two consecutive UL and DL grants; and identifying a collision in response to sending or receiving the information, the collision comprising at least one of: a collision between the first DL data channel and the second DL data channel, a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel, a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or a collision between the first UL data channel and the second UL data channel.
Certain aspects of the present disclosure provide a method performed by a wireless device, such as a Base Station (BS). The method generally comprises: transmitting interleaved Uplink (UL) and Downlink (DL) grants on a control channel in a narrow band of a system bandwidth; and transmitting or receiving information in response to the transmitted interleaved UL and DL grants.
Certain aspects of the present disclosure provide a method performed by a wireless device, such as a Base Station (BS). The method generally comprises: transmitting two consecutive Uplink (UL) or Downlink (DL) grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth, the consecutive UL or DL grants having a same HARQ process Identification (ID), wherein: the authorization to use is selected by the UE based at least in part on at least one of: a grant that satisfies an energy metric threshold, the grant received first, or the grant received second, or both grants selected for use by the UE, wherein the grant is considered a hybrid automatic repeat request (HARQ) retransmission.
Certain aspects of the present disclosure provide a method performed by a wireless device, such as a Base Station (BS). The method generally comprises: transmitting two consecutive UL or DL grants to a User Equipment (UE) on a control channel in a narrow band of a system bandwidth; transmitting or receiving information in response to the transmitted two consecutive UL and DL grants, wherein in response to transmitting or receiving the information, a collision is identified that includes at least one of: a collision between the first DL data channel and the second DL data channel, a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel, a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or a collision between the first UL data channel and the second UL data channel.
Numerous other aspects are provided, including methods, apparatus, systems, computer program products, computer readable media, and processing systems. To the accomplishment of the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the description is intended to include all such aspects and their equivalents.
Drawings
So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects.
Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with certain aspects of the present disclosure.
Fig. 2 illustrates a block diagram conceptually illustrating an example of a Base Station (BS) communicating with a User Equipment (UE) in a wireless communication network, in accordance with certain aspects of the present disclosure.
Fig. 3 is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with certain aspects of the present disclosure.
Fig. 4 is a block diagram conceptually illustrating two exemplary subframe formats with a normal cyclic prefix, in accordance with certain aspects of the present disclosure.
Fig. 5 illustrates an example subframe configuration for enhanced/evolved machine type communication (eMTC) in accordance with certain aspects of the present disclosure.
Fig. 6 illustrates an example deployment of a narrowband internet of things (NB-IoT) in accordance with certain aspects of the present disclosure.
Fig. 7 illustrates an exemplary logical architecture of a distributed Radio Access Network (RAN) in accordance with certain aspects of the present disclosure.
Fig. 8 illustrates an exemplary physical architecture of a distributed RAN in accordance with certain aspects of the present disclosure.
Fig. 9 is a diagram illustrating an example of a Downlink (DL) -centric subframe in accordance with certain aspects of the present disclosure.
Fig. 10 is a diagram illustrating an example of a subframe centered on an Uplink (UL) in accordance with certain aspects of the present disclosure.
Fig. 11 illustrates an example of a release 13HARQ process timing and an example of a release 14HARQ process timing, in accordance with certain aspects of the present disclosure.
Fig. 12 illustrates an example interleaving grant (DL followed by UL) in accordance with certain aspects of the present disclosure.
Fig. 13 illustrates an example interleaving grant (UL followed by DL) in accordance with certain aspects of the present disclosure.
Fig. 14 illustrates an example interleaved NPDCCH and NPUSCH in accordance with certain aspects of the present disclosure.
Fig. 15 is a flow diagram illustrating exemplary operations for receiving interleaved uplink and downlink grants in a narrow band of a system bandwidth in accordance with certain aspects of the present invention.
Fig. 16 is a flow diagram illustrating exemplary operations of UE behavior when receiving back-to-back UL grants or DL grants with the same HARQ ID, according to certain aspects of the present disclosure.
Fig. 17 is a flow diagram illustrating exemplary operations of UE behavior related to collisions when receiving back-to-back UL grants or DL grants according to certain aspects of the present disclosure.
To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation.
Detailed Description
Aspects of the present disclosure provide techniques for uplink and downlink operations for narrowband operations. The techniques described herein may be used for various wireless communication networks such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes wideband CDMA (wcdma), time division synchronous CDMA (TD-SCDMA), and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. TDMA networks may implement radio technologies such as global system for mobile communications (GSM). OFDMA networks may implement methods such as evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, and,
Etc. radio technologies. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-advanced (LTE-A) in Frequency Division Duplex (FDD) and Time Division Duplex (TDD) are new versions of UMTS using E-UTRA, which uses OFDMA on the downlink and SC-FDMA on the uplink. UTRA, E-UTRA, UMTS, LTE-A and GSM are described in the literature for an organization named "third Generation partnership project" (3 GPP). Cdma2000 and UMB are described in a document entitled "thirdNote that although aspects may be described herein using terms commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure may be applied to other generation-based communication systems, such as 5G and higher versions.
Exemplary Wireless communication network
Fig. 1 illustrates an exemplary
The
The BS may provide communication coverage for a macro cell, pico cell, femto cell, and/or other types of cells. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a small geographic area (e.g., a home) and may allow restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). The BS for the macro cell may be referred to as a macro BS. The BS for the pico cell may be referred to as a pico BS. The BS for the femto cell may be referred to as a femto BS or a home BS. In the example shown in fig. 1, BS110 a may be a macro BS for
The
The
UEs 120 (e.g., UE120 a, UE120 b, UE120 c) may be dispersed throughout
One or more UEs 120 (e.g., an LTE network) in the
In fig. 1, a solid line with double arrows indicates a desired transmission between a UE and a serving BS (which is a BS designated to serve the UE on the downlink and/or uplink). The dashed line with double arrows indicates a potentially interfering transmission between the UE and the BS.
In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular Radio Access Technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. The frequencies may also be referred to as carriers, frequency channels, etc. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5GRAT networks may be deployed.
In some examples, access to the air interface may be scheduled, where a scheduling entity (e.g., BS 110) allocates resources for communications between some or all of the devices and apparatuses within its service area or cell. The scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources of one or more subordinate entities. For scheduled communications, the subordinate entity utilizes the resources allocated by the scheduling entity. BS110 is not the only entity that can function as a scheduling entity. In some examples, UE120 may function as a scheduling entity that schedules resources for one or more subordinate entities (e.g., one or more other UEs 120). In this example, the UE functions as a scheduling entity, and other UEs wirelessly communicate using resources scheduled by the UE. The UE may function as a scheduling entity in a peer-to-peer (P2P) network and/or in a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, the UEs may optionally communicate directly with each other.
Thus, in a wireless communication network having scheduled access to time-frequency resources and having a cellular configuration, a P2P configuration, and a mesh configuration, a scheduling entity and one or more subordinate entities may communicate using the scheduled resources.
Fig. 2 shows a block diagram of a design of BS110 and UE120, where BS110 and UE120 may be one of BS110 and one of UE120 in fig. 1. BS110 may be equipped with
At BS110, a transmit
At UE120,
On the uplink, at UE120, a transmit
Controllers/
Fig. 3 illustrates an
In some wireless communication systems (e.g., LTE), a BS (e.g., such as BS 110) may transmit PSS and SSS on the downlink at the center of the system bandwidth for each cell supported by the BS. The PSS and SSS may be transmitted in
In some systems (e.g., such as NR or 5G systems), the BS may transmit these or other signals in these or different locations of the subframe.
Fig. 4 shows two exemplary subframe formats 410 and 420 with a normal cyclic prefix. The available time-frequency resources may be divided into Resource Blocks (RBs). Each RB may cover 12 subcarriers in one slot and may include a plurality of Resource Elements (REs). Each RE may cover one subcarrier in one symbol period and may be used to transmit one modulation symbol, which may be real or complex valued.
Publicly available under the term "Evolved Universal Radio Access (E-UTRA); PSS, SSS, CRS and PBCH in LTE are described in 3GPP TS 36.211 of Physical Channels and Modulation.
For FDD in LTE, an interlace may be used for each of the downlink and uplink. For example, Q interlaces may be defined with indices of 0 through Q-1, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include subframes separated by Q frames. Specifically, interlace Q may include subframe Q, Q + Q, Q +2Q, etc., where Q ∈ { 0., Q-1 }.
The wireless network may support hybrid automatic repeat request (HARQ) for data transmission on the downlink and uplink. For HARQ, a transmitter (e.g., a BS) may send one or more transmissions of a packet until a receiver (e.g., a UE) correctly decodes the packet or encounters some other termination condition. For synchronous HARQ, all transmissions of a packet may be sent in a subframe of a single interlace. For asynchronous HARQ, each transmission of a packet may be sent in any subframe.
The UE may be located within the coverage area of multiple BSs. One of the BSs may be selected to serve the UE. The serving BS may be selected based on various criteria such as received signal strength, received signal quality, path loss, and the like. The received signal quality may be quantified by a signal-to-noise-and-interference ratio (SINR) or RSRQ or some other metric. The UE may operate in a scenario with significant interference, where the UE may observe high interference from one or more interfering BSs.
The wireless communication network may support 180kHz deployments for narrowband operation (e.g., NB-IoT) in different deployment modes. In one example, narrowband operation may be deployed in-band, e.g., using RBs within a wider system bandwidth. In one case, the narrowband operation may use one RB within the wider system bandwidth of an existing network (e.g., an LTE network). In this case, the 180kHz bandwidth of the RB may have to be aligned with the wideband RB. In one example, narrowband operation may be deployed in unused RBs within a carrier guard band (e.g., LTE). In this deployment, the 180kHz RBs within the guard band may be aligned with the 15kHz tone grid of wideband LTE, e.g., to use the same Fast Fourier Transform (FFT) and/or to reduce in-band interference of conventional LTE communications.
Exemplary narrowband communications
Conventional LTE designs (e.g., for conventional "non-MTC" devices) focus on improvements in spectral efficiency, universal coverage, and enhanced quality of service (QoS) support. Current LTE system Downlink (DL) and Uplink (UL) link budgets are designed to cover high-end devices, such as the most advanced smartphones and tablets, which can support relatively large DL and UL link budgets.
However, as described above, one or more UEs in a wireless communication network (e.g., wireless communication network 100) may be devices with limited communication resources, such as narrowband UEs, as compared to other (broadband) devices in the wireless communication network. For narrowband UEs, various requirements may be relaxed, as only a limited amount of information may need to be exchanged. For example, the maximum bandwidth may be reduced (relative to a wideband UE), a single receive Radio Frequency (RF) chain may be used, the peak rate may be reduced (e.g., up to 100 bits for a transport block size), the transmit power may be reduced,
In some cases, if half-duplex operation is performed, the MTC UE may have a relaxed switching time to switch from transmitting to receiving (or vice versa). For example, the switching time may be relaxed from 20 μ s for regular UEs to 1ms for MTC UEs. A release 12MTC UE can still monitor the Downlink (DL) control channel in the same way as a regular UE, e.g., monitoring a wideband control channel (e.g., PDCCH) in the first few symbols and a narrowband control channel (e.g., enhanced PDCCH or ePDCCH) that occupies a relatively narrow band but spans the subframe length.
Certain standards (e.g., LTE release 13) may introduce support for various additional MTC enhancements, referred to herein as enhanced MTC (or eMTC). For example, eMTC may provide up to 15dB of coverage enhancement for MTC UEs.
As shown in the
However, as described above, the eMTC UE is capable of operating in a cell with a bandwidth greater than 6 RBs. Within this larger bandwidth, each eMTC UE may still operate (e.g., monitor/receive/transmit) while complying with 6 Physical Resource Block (PRB) constraints. In some cases, different eMTC UEs may be served by different narrowband regions (e.g., each spanning a 6-PRB block). Since the system bandwidth may span 1.4 to 20MHz, or from 6 to 100 RBs, there may be multiple narrowband regions within a larger bandwidth. The eMTC UE may also switch or hop between multiple narrowband regions in order to reduce interference.
Exemplary narrowband Internet of things
The internet of things (IoT) may refer to a network of physical objects, devices, or "things". IoT devices may be embedded with, for example, electronic devices, software, or sensors, and may have network connectivity that enables the devices to collect and exchange data. IoT devices can be remotely sensed and controlled across existing network infrastructure, creating opportunities for more direct integration between the physical world and computer-based systems, thereby improving efficiency, accuracy, and economic benefits. A system including IoT devices augmented with sensors and actuators may be referred to as a cyber-physical (cyber-physical) system. The cyber-physical system may include technologies such as intelligent networks, intelligent homes, intelligent transportation, and/or intelligent cities. Each "thing" (e.g., IoT device) can be uniquely identified by its embedded computing system and can interoperate within an existing infrastructure (e.g., the internet infrastructure).
NB-IoT may refer to a narrowband radio technology specifically designed for IoT. NB-IoT may be dedicated to indoor coverage, low cost, long battery life, and large number of devices. To reduce the complexity of the UE, NB-IoT may allow narrowband deployment with one PRB (e.g., 180kHz +20kHz guard band). NB-IoT deployments may utilize higher layer components of certain systems (e.g., LTE) and hardware to allow for reduced fragmentation and cross-compatibility with, for example, NB-LTE/NB-IoT and/or eMTC.
Fig. 6 illustrates an
Some systems (e.g., LTE) may include unused portions of the radio spectrum between carriers to prevent interference between adjacent carriers. In some deployments, the NB-IoT may be deployed in the
In other deployments, the NB-IoT may be deployed independently (not shown). For example, in a standalone deployment, NB-IoT traffic may be carried with one 200MHz carrier and GSM spectrum may be reused.
The deployment of NB-IoT may include synchronization signals, such as PSS for frequency and timing synchronization and SSS for carrying system information. For NB-IoT operation, the PSS/SSS timing boundaries may be extended, e.g., from 10ms to 40ms, compared to existing PSS/SSS frame boundaries in legacy systems (e.g., LTE). Based on the timing boundary, the UE may be able to receive a PBCH transmission, which may be transmitted in
Exemplary NR/5G RAN architecture
A New Radio (NR) may refer to a radio technology configured to operate according to a new air interface (e.g., in addition to an Orthogonal Frequency Division Multiple Access (OFDMA) -based air interface) or a fixed transport layer (e.g., in addition to an Internet Protocol (IP)). NR may utilize OFDM with CP on the uplink and downlink and include support for half-duplex operation using TDD. NR may include enhanced mobile broadband (eMBB) services for wide bandwidths (e.g., over 80MHz), millimeter waves (mmW) for high carrier frequencies (e.g., 60GHz), massive MTC (MTC) for non-backward compatible MTC technologies, and/or critical tasks for ultra-reliable low-latency communication (URLLC) services.
A single Component Carrier (CC) bandwidth of 100MHz may be supported. The NR RB may span 12 subcarriers having a subcarrier bandwidth of 75kHz with a duration of 0.1 ms. Each radio frame may consist of 50 subframes, 10ms in length. Thus, each subframe may have a length of 0.2 ms. Each subframe may indicate a link direction (e.g., DL or UL) for data transmission, and the link direction of each subframe may be dynamically switched. Each subframe may include DL/UL data as well as DL/UL control data. The UL and DL subframes for NR are described in more detail as follows with respect to fig. 9 and 10.
Beamforming may be supported and beam directions may be dynamically configured. MIMO transmission with precoding may also be supported. MIMO configuration in DL may support up to 8 transmit antennas, and have multi-layer DL transmission of up to 8 streams, and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells. Alternatively, the NR may support a different air interface than the OFDM based interface. The NR network may comprise entities such as Central Units (CUs) or Distributed Units (DUs).
The NR RAN may include CUs and DUs. An NR BS (e.g., NB, eNB, gNB, 5G NB, TRP, AP, etc.) may correspond to one or more BSs. The NR cell may be configured as an access cell (ACell) or a data cell only (DCell). For example, the RAN (e.g., CU or DU) may configure a cell. The DCell may be a cell used for carrier aggregation or dual connectivity, but not for initial access, cell selection/reselection, or handover. In some cases, the DCell may not transmit the synchronization signal-in some cases, the DCell may transmit the synchronization signal.
Fig. 7 illustrates an example
There may be a dynamic configuration of split logic functions within
Fig. 8 illustrates an exemplary
A centralized RAN unit (C-RU)804 may house one or more ANC functions. Optionally, the C-
Fig. 9 is a diagram illustrating an example of a subframe 900 centered on DL. DL-centric sub-frame 900 may include a control portion 902. The control portion 902 may be present in an initial or beginning portion of the subframe 900 centered on the DL. Control portion 902 may include various scheduling information and/or control information corresponding to various portions of DL-centric sub-frame 900. In some configurations, the control portion 902 may be a Physical DL Control Channel (PDCCH), as shown in fig. 9. DL-centric sub-frame 900 may also include a DL data portion 904. The DL data portion 904 may sometimes be referred to as the payload of the DL-centric sub-frame 900. The DL data portion 904 may include communication resources for transmitting DL data from a scheduling entity (e.g., a UE or BS) to a subordinate entity (e.g., a UE). In some configurations, the DL data portion 904 may be a Physical DL Shared Channel (PDSCH).
The DL-centric sub-frame 900 may also include a common UL portion 906. Common UL portion 906 may sometimes be referred to as a UL burst, a common UL burst, and/or various other suitable terms. Common UL portion 906 may include feedback information corresponding to various other portions of subframe 900 centered on the DL. For example, common UL portion 906 may include feedback information corresponding to control portion 902. Non-limiting examples of feedback information may include Acknowledgement (ACK) signals, Negative Acknowledgement (NACK) signals, HARQ indicators, and/or various other suitable types of information. Common UL portion 906 may include additional or alternative information such as information related to Random Access Channel (RACH) procedures, Scheduling Requests (SRs), and various other suitable types of information. As shown in fig. 9, the end of the DL data portion 904 may be separated in time from the beginning of the common UL portion 906. The time interval may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. The interval provides time for switching from DL communications (e.g., reception operations by the subordinate entity) to UL communications (e.g., transmissions by the subordinate entity). Those of ordinary skill in the art will appreciate that the above is merely one example of a DL-centric subframe, and that alternative structures having similar features may exist without necessarily departing from the aspects described herein.
Fig. 10 is a diagram showing an example of a UL-
As shown in fig. 10, the end of the
In some cases, two or more subordinate entities (e.g., UEs) may communicate with each other using sidelink signals. Practical applications of such sidelink communications may include public safety, proximity services, UE-to-network relays, vehicle-to-vehicle (V2V) communications, internet of everything (IoE) communications, IoT communications, mission critical grids, and/or various other suitable applications. In general, sidelink signals may refer to signals transmitted from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and/or control purposes. In some examples, sidelink signals may be transmitted using licensed spectrum (as opposed to wireless local area networks that typically use unlicensed spectrum).
The UE may operate in various radio resource configurations, including configurations associated with transmitting pilots using a set of dedicated resources (e.g., RRC dedicated state, etc.) or configurations associated with transmitting pilots using a set of common resources (e.g., RRC common state, etc.). When operating in the RRC dedicated state, the UE may select a dedicated set of resources for transmitting pilot signals to the network. When operating in the RRC common state, the UE may select a common set of resources for transmitting pilot signals to the network. In either case, the pilot signal transmitted by the UE may be received by one or more network access devices (such as AN or DU) or portions thereof. Each receiving network access device may be configured to receive and measure pilot signals transmitted on a set of common resources and also receive and measure pilot signals transmitted on a set of dedicated resources allocated to a UE for which the network access device is a member of a network access device monitoring group for the UE. A CU to which one or more receiving network access devices or measurements of pilot signals transmitted by the receiving network access devices may use the measurements to identify a serving cell for the UE or initiate a change to the serving cell of one or more UEs.
Exemplary uplink and downlink grants for narrowband
As described above, some systems (e.g.,
Some systems (e.g.,
Currently, in some systems, such as NB-IoT, only half-duplex (HD) FDD (frequency division duplex) operation is supported. The UE cannot monitor UL and DL simultaneously and does not need to support concurrent UL and DL transmissions. The rules of the timing constraints are defined such that the gap between NPDCCH for UL grant and associated NPUSCH (narrowband PUSCH) transmission is at least 8ms (e.g., the exact delay is determined by a field in the UL grant) and the gap between NPDCCH for DL grant and associated NPDSCH (narrowband PDSCH) is at least 5ms (e.g., the exact delay is determined by a field in the DL grant). NPUSCH and NPDSCH are examples of shared channels or data channels. Depending on the context, a "channel" may refer to a channel over which signaling/data/information is transmitted or received, or to signaling/data/information transmitted or received over a channel. In Rel-13, only a single HARQ process is supported in NB-IoT. After receiving one NPDCCH for DL grant or UL grant, the UE stops monitoring the NPDCCH until the data transmission is completed. In Rel-14, for NB-IoT, there may be two DL grants back-to-back or two UL grants back-to-back for two HARQ processes, e.g., after receiving one DL or UL grant, the UE may be required to continue monitoring any NPDCCH search space containing candidates, at least 2ms (x 2ms) before the first NPDSCH or NPUSCH begins (x n h)1> 2ms) end.
Fig. 11 shows an example of a release 13HARQ process timing and an example of a release 14HARQ process timing. As shown for
Unlike HD-FDD, for TDD, DL and UL subframes may be interleaved during NPUSCH/NPDSCH transmission. To support NB-IoT TDD DL and UL transmissions, a UE may receive some DL subframes for DL packets (e.g., associated with NPDCCH for DL grant), followed by UL transmissions for UL packets (e.g., associated with NPDCCH for UL grant), then repetitions of the same DL packet, then followed by some repetitions of the same UL packet, and so on.
According to the Rel-14 specification, for NB-IoT, a UE may receive only two DL grants back to back or two UL grants back to back, and not support the UE to receive interleaved UL and DL grants. For Rel-15, the extension of NB-IoT to TDD mode may be discussed. For TDD, parallel uplink and downlink transmissions mean, for example, that the UE receives a DL transmission of a DL packet, followed by a UL transmission of a UL packet, followed by a repetition of the same DL packet, followed by a repetition of the same UL packet. To support such interleaved DL/UL transmissions, the DL/UL grants also require interleaving, and current standard specifications do not support this feature. Receiving interleaved UL and DL grants includes: one DL grant is received as a next grant after one UL grant, or one UL grant is received as a next grant after one DL grant. Interleaving UL and DL grants is needed to support interleaved UL and DL transmissions, especially for TDD. Interleaving UL and DL grants may also be beneficial for FDD, for example, to improve UL/DL transmission efficiency (e.g., for some current TDM-based applications, DL data transmission may need to be completed first for UL data transmission).
Interleaved UL and DL grants may be supported such that the UE may receive two grants, one for UL and one for DL, before the start of the corresponding NPUSCH or NPDSCH transmission. The timing constraint irregularity between NPDCCH and NPDSCH/NPUSCH may remain unchanged. For example, the gap between the second NPDCCH and the beginning of NPDSCH or NPUSCH may be ≧ 2 ms. In addition, for HD-FDD, the UE is not required to monitor NPDCCH (e.g., for a third grant) between the NPDSCH start to HARQ-ACK. This simplifies the UE implementation and saves UE power since otherwise the UE needs to receive DL control information in addition to data. In an aspect, there is no limitation on the order of the interleaved UL and DL grants, e.g., the first grant may be a UL or DL grant.
Fig. 12 illustrates an example interleaving grant (DL followed by UL) in accordance with certain aspects of the present disclosure. In one example, the first grant is a UL grant and the second grant is a DL grant. The time delay from grant to associated data transmission may be the same as described above (e.g., 8ms or more between a UL grant and an associated NPUSCH transmission and 5ms or more between a DL grant and an associated NPDSCH transmission). In this example, the UL data transmission (e.g., on NPUSCH) occurs between the DL data transmission (e.g., on NPDSCH) and the HARQ-ACK associated with the DL data transmission. In a second example, the order of data transmission is different. Here, UL data transmission (e.g., on NPUSCH) occurs before DL data transmission (e.g., on NPDSCH). In a third example, UL data transmission (e.g., on NPUSCH) occurs after HARQ-ACK associated with DL data transmission (e.g., on NPDSCH). Thus, the order of data transmission is determined by, for example, the delay between NPDCCH and the associated data transmission (e.g., determined by a field in NPDCCH).
Fig. 13 illustrates an example interleaving grant (UL followed by DL) in accordance with certain aspects of the present disclosure. Fig. 13 shows a similar concept as fig. 12.
For NB-IoT in TDD mode, NPUSCH and NPDCCH interleaving may be supported, e.g., the UE may continue to monitor NPDCCH search space while making NPUSCH transmissions. Due to TDD UL-DL configuration, there may be some DL Subframes (SFs) between UL transmissions, and the UE may switch from UL transmissions (e.g., NPUSCH transmissions) to monitoring NPDCCH search space during the DL SF. In an aspect, if a subframe is indicated as DL according to the TDD UL-DL configuration, the UE is required to continue monitoring the search space unless the DL subframe is used for NPDSCH. In the case of interleaved DL and UL data transmissions, if a protected subframe is needed to switch from UL to DL or from DL to UL, the DL or UL communications (e.g., communications scheduled to occur during the protected subframe) associated with the protected subframe may be deferred to the next available SF. In the case of interleaved DL and UL data transmission, if several OFDM symbols are needed to switch from UL to DL or from DL to UL, the associated DL or UL communications in a subframe may be punctured, for example. For example, when switching from UL to DL, the first two symbols in the second subframe (DL) may be punctured, and when switching from DL to UL, the last symbol in the first subframe (DL) and the first symbol in the second subframe (UL) may be punctured.
Fig. 14 illustrates an example interleaved NPDCCH and NPUSCH in accordance with certain aspects of the present disclosure. In this example, TDD UL-
Interleaved UL/DL grants may be supported with or without support of two HARQ processes. Up to 4 NPDCCHs may be received if interleaved UL and DL grants are supported with two HARQ processes, e.g., two for DL grants and two for UL grants. In the case of back-to-back DL or UL grants, the two grants may have the same or different HARQ IDs. The same HARQ ID may represent a duplicate transmission (e.g., retransmission of the first NPDCCH). The two HARQ IDs may occur in any order for different HARQ IDs, or the first grant may always have
As an aspect of the present disclosure, an exemplary timeline for two HARQ processes is shown below.
Time line 1: NPDCCH1 NPDCCH2 NPDSCHA ACKA NPDSCHB ACKB
Time line 2: NPDCCH1 NPDCCH2 NPDSCHA NPDSCHB ACKA ACKB
In an aspect, only one of these timelines is allowed (e.g., fixed timing). In another aspect, two timelines are allowed. For NPDCCH to NPDSCH mapping, in an aspect NPDSCH a may always map to NPDCCH1 and NPDSCH B may always map to NPDCCH2, and the other mappings may be considered as error cases and the UE may discard one of the grants. In another aspect, two mappings are allowed (e.g., NPDSCHA to NPDCCH1 or NPDCCH 2).
Thus, techniques for uplink and downlink grants in narrowband operation are desired. Thus, the techniques presented herein may be used for uplink and downlink grants in narrowband operation (e.g., NB-IoT).
Fig. 15 is a flow diagram illustrating
Fig. 16 is a flow diagram illustrating example operations 1600 of UE behavior when receiving back-to-back UL or DL grants with the same HARQ ID, according to aspects described herein. Operation 1600 may be performed, for example, by a UE (e.g., UE120), which may be a low-cost IoT device, such as an NB-IoT device. The operations 1600 may begin at 1602 with monitoring a control channel in a narrow band of system bandwidth for an Uplink (UL) or Downlink (DL) grant at 1602. At 1604, the UE receives two consecutive UL or DL grants, wherein the consecutive UL or DL grants have the same HARQ process Identification (ID). At 1606, the UE selects one of the grants to use based at least in part on at least one of: authorizations to satisfy an energy metric threshold; authorization received first; or a second received authorization. At 1608, the UE may alternatively choose to use two grants, wherein the grants are treated as hybrid HARQ retransmissions.
Exemplary UL and/or DL Conflict handling
In case two HARQ processes are configured, it is possible that the eNB may schedule the UE such that there is a collision across channels, e.g. by incorrect scheduling. For example, a collision may occur when two or more sets of information are transmitted or received simultaneously on the same resource (e.g., subframe). For example, a UE may have two back-to-back NPDSCH, with the ACKs of the two NPDSCH colliding or the ACK of the second NPDSCH colliding with the first NPDSCH, etc. For back-to-back NPUSCH, there may be similar types of conflicts. There may also be NPUSCH to NPDSCH collisions, NPUSCH to ACK collisions, etc. if interleaved UL and DL grants are implemented. Exemplary UE behavior in the case of such collisions is shown herein and may be applicable to TDD and/or FDD.
Conflict handling for back-to-back DL or UL grants
Fig. 17 is a flow diagram illustrating example operations 1700 of UE behavior relating to collisions when receiving back-to-back UL or DL grants, according to aspects described herein. Operation 1700 may be performed, for example, by a UE (e.g., UE120), which may be a low-cost IoT device, such as an NB-IoT device. Operations 1700 may begin, at 1702, with monitoring a control channel in a narrowband of system bandwidth for an Uplink (UL) or Downlink (DL) grant. At 1704, the UE receives two consecutive UL or DL grants. At 1706, the UE transmits or receives information in response to the received two consecutive UL and DL grants. At 1708, in response to transmitting or receiving the information, the UE identifies a collision, the collision comprising at least one of: a collision between the first DL data channel and the second DL data channel, a collision between the second DL data channel and first HARQ acknowledgement (HARQ-ACK) signaling for the first DL data channel, a collision between first HARQ-ACK signaling for the first DL data channel and second HARQ-ACK signaling for the second DL data channel, or a collision between the first UL data channel and the second UL data channel.
In the event of NPDSCH and NPDSCH collisions, in an aspect, both NPDSCH may be considered valid even if there is a collision, and may attempt to decode using 1) non-colliding subframes in both NPDSCH (e.g., the UE decodes both) or using 2) colliding SFs for only one of the NPDSCH (e.g., the UE decodes only one of the two, the first, the second, or based on an associated control channel energy metric). In another aspect, only one of the NPDSCH's, e.g., the first NPDSCH or the second NPDSCH, may be monitored or based on a corresponding NPDCCH energy metric (e.g., associated control channel energy detection). The first NPDSCH may refer to the NPDSCH starting first or whose NPDCCH starts first, and the second NPDSCH may refer to the NPDSCH starting second or whose NPDCCH starts second.
In the event that the NPDSCH collides with an ACK (e.g., an ACK for the first NPDSCH collides with the second NPDSCH), in an aspect, it is considered an incorrect grant and one of the NPDSCH and the corresponding ACK is discarded (similar to the NPDSCH colliding with the NPDSCH). In another aspect, the ACK may be discarded. (in whole or in part, e.g., on colliding subframes). In another aspect, NPDSCH may be dropped (in whole or in part, e.g., on a colliding subframe). The collision SF may include an SF including ACK/NPDSCH, a guard SF for switching from UL to DL, and the like.
In the case of an ACK colliding with an ACK, in an aspect, it is treated as an incorrect grant and one of NPDSCH (similar to NPDSCH collision) or ACK is discarded. In another aspect, only the first or second ACK is sent. In another aspect, the first ACK is sent in its entirety and the second ACK is punctured, or vice versa. If only one NPDSCH decodes successfully, an ACK corresponding to the NPDSCH may be sent and the ACK transmission corresponding to the failed NPDSCH may be punctured for the failed NPDSCH.
In the event that NPUSCH collides with NPUSCH, in an aspect, one of NPUSCH may be dropped. In another aspect, one of the NPUSCHs may be punctured and the other NPUSCH may be fully transmitted. For example, the discarded or punctured NPUSCH may always be the first, always the second, or based on the NPDCCH energy metric.
Collision handling of interleaved UL and DL grants
In the event that NPUSCH collides with NPDSCH, in an aspect, it is treated as an incorrect grant and either NPUSCH or NPDSCH is discarded (e.g., first or second, or based on NPDCCH energy metric, etc.). On the other hand, it is considered a valid grant, but only one of them is reserved in the colliding SF by prioritizing one channel over the other. For example, one of NPUSCH or NPDSCH may be dropped or punctured. For example, the dropped or punctured channel may be always first, always second, or based on NPDCCH energy metrics.
In the case where NPUSCH collides with HARQ-ACK, in an aspect, only one of the colliding SFs is reserved by prioritizing one channel over the other (e.g., HARQ-ACK over NPUSCH). In another aspect, HARQ-ACKs may be multiplexed on NPUSCHs (e.g., HARQ-ACKs are used to modulate DMRSs of NPUSCHs in colliding SFs).
As used herein, the term "identify" includes a wide variety of operations. For example, "identifying" can include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Further, "identifying" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Further, "identifying" may include solving, selecting, choosing, establishing, and the like.
Furthermore, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless otherwise indicated or clearly indicated by context, for example, a phrase "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, for example, the phrase "X employs A or B" is satisfied by any of the following: x is A; b is used as X; or X uses A and B simultaneously. As used herein, reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more. For example, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form. The term "some" means one or more unless specifically stated otherwise. A phrase referring to "at least one of" a list of items refers to any combination of those items, including a single member. By way of example, "at least one of a, b, or c" is intended to cover: a. b, c, a-b, a-c, b-c, and a-b-c, as well as any combination of a plurality of the same elements (e.g., a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c). As used herein, including in the claims, the term "and/or" when used in a list of two or more items means that any one of the listed items can be used alone or any combination of two or more of the listed items can be used. For example, if a composition is described as containing components A, B and/or C, the composition may comprise a alone a; b alone; c alone; a and B in combination; a and C in combination; b and C in combination; or A, B in combination with C.
In some cases, a device may have an interface for transmitting frames for transmission or reception rather than actually transmitting frames. For example, the processor may output the frame to the RF front end for transmission via the bus interface. Similarly, a device may have an interface for obtaining a frame received from another device instead of actually receiving the frame. For example, the processor may obtain (or receive) the transmitted frame from the RF front end via the bus interface.
The methods disclosed herein comprise one or more steps or operations for carrying out the methods. Method steps and/or operations may be interchanged with one another without departing from the scope of the claims. That is, unless a specific order of steps or operations is specified, the order and/or use of specific steps and/or operations may be modified without departing from the scope of the claims.
The various operations of the methods described above may be performed by any suitable means capable of performing the corresponding functions. The unit may include various hardware and/or software components and/or modules, including but not limited to a circuit, an Application Specific Integrated Circuit (ASIC), or a processor. In general, in the case of the operations shown in the figures, these operations may be performed by any suitable corresponding functional unit components.
For example, the means for monitoring, the means for identifying, the means for selecting, the means for determining, the means for performing, the means for transmitting, the means for receiving, the means for sending, the means for signaling, the means for requesting, and/or the means for deriving may include one or more processors, transmitters, receivers, antennas, and/or other elements of the
Those of skill in the art would understand that information and signals 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 above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as hardware, software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed with 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 herein. One or more of the above devices or processors may execute software. Software should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subprograms, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. 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 steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, phase change memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary designs, the functions described may be implemented in hardware, software, or a combination thereof. If implemented in software, thenThe functions described may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A 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, such computer-readable media can comprise RAM, ROM, EEPROM, CD/DVD or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store desired program code means in the form of instructions or data structures and which can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, 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 and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and
disks, where magnetic disks usually reproduce data magnetically, while optical disks reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.The previous description of the disclosure is provided to enable any person skilled in the art to make or use the 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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