阅读说明：本技术 用于超可靠低等待时间通信(urllc)的物理上行链路控制信道(pucch)重传 (Physical Uplink Control Channel (PUCCH) retransmission for ultra-reliable low latency communications (URLLC) ) 是由 许昌龙 武良明 陈凯 李剑 徐晧 T·姬 J·B·索里亚加 蒋靖 于 2019-02-07 设计创作，主要内容包括：提供了用于超可靠低等待时间通信(URLLC)的物理上行链路共享信道(PUCCH)重传的技术。用户装备(UE)传送控制信道的至少一个码块,该至少一个码块包括信道状态信息(CSI),其中每个码块通过按比特信道的特定可靠性次序向这些比特信道指派该码块的比特索引来被极性编码。UE检测触发,并且作为响应,重传每个码块的至少一部分,该部分包括重传的CSI,其中该部分通过相比于对CSI的极性编码按比特信道的可靠性逆序向这些比特信道指派重传的CSI的比特索引来被极性编码。(Techniques for physical uplink shared channel (PUCCH) retransmission for ultra-reliable low latency communications (URLLC) are provided. A User Equipment (UE) transmits at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to bit channels in a particular reliability order of the bit channels. The UE detects the trigger and, in response, retransmits at least a portion of each code block, the portion including the retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to bit channels in reverse order of their reliability as compared to the polarity encoding of the CSI.)

1. A method for wireless communications by a User Equipment (UE), comprising:

transmitting at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to a bit channel in a particular reliability order of the bit channel;

detecting a trigger; and

retransmitting at least a portion of each code block in response to the trigger, the portion including retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to the bit channels in reverse order of reliability of the bit channels as compared to polarity encoding of the CSI.

2. The method of claim 1, wherein for each code block:

for the transmission, bit indices of the code block are assigned to the bit channels in descending order of reliability of the bit channels, wherein the CSI is assigned to the bit channels starting from a lowest CSI bit index to a highest CSI bit index;

for the retransmission, bit indices of the portions are assigned to the bit channels in descending order of reliability of the bit channels, and wherein CSI for the retransmission is assigned bit channels starting from a highest CSI bit index to a lowest CSI bit index.

3. The method of claim 1, further comprising:

dividing the CSI into a plurality of segments;

transmitting each segment of the CSI in a different code block,

wherein the retransmitted portion comprises a portion of at least one transmitted segment of the CSI.

4. The method of claim 1, wherein the retransmitted portion of the code block does not include Cyclic Redundancy Check (CRC) bits.

5. The method of claim 1, wherein the retransmitted CSI comprises only a portion of the CSI.

6. The method of claim 1, wherein the retransmitting comprises: retransmitting the portion of the code block in a preconfigured retransmission opportunity, wherein the triggering comprises detecting the retransmission opportunity.

7. The method of claim 6, wherein a retransmission opportunity is configured between every two transmissions of the control channel.

8. The method of claim 1, wherein detecting the trigger comprises: receiving a decoding result for a transmission of the at least one code block, wherein the retransmission is based on the decoding result.

9. The method of claim 8, further comprising: receiving the decoding result on a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH).

10. The method of claim 9, wherein receiving the decoding result comprises: receiving the decoding result in the PHICH only when the PHICH is not scheduled to include feedback on transmission on a Physical Uplink Shared Channel (PUSCH).

11. The method of claim 8, further comprising: receiving the decoding result as part of Downlink Control Information (DCI).

12. The method of claim 1, wherein the DCI comprises additional bits to indicate the decoding result.

13. The method of claim 8, further comprising: receiving the decoding result on a channel configured to indicate the decoding result.

14. The method of claim 1, wherein the control channel comprises a Physical Uplink Control Channel (PUCCH).

15. A method for wireless communications by a Base Station (BS), comprising:

receiving a transmission of at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to a bit channel in a particular reliability order of the bit channel;

receiving a retransmission of at least a portion of each code block, the portion including retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to the bit channel in an inverse order of reliability of the bit channel as compared to polarity encoding of the CSI; and

decoding the at least one code block based on the transmission and the retransmission.

16. The method of claim 15, wherein for each code block:

for the transmission, bit indices of the code block are assigned to the bit channels in descending order of reliability of the bit channels, wherein the CSI is assigned to the bit channels starting from a lowest CSI bit index to a highest CSI bit index;

for the retransmission, bit indices of the portions are assigned to the bit channels in descending order of reliability of the bit channels, and wherein CSI for the retransmission is assigned bit channels starting from a highest CSI bit index to a lowest CSI bit index.

17. The method of claim 15, wherein the decoding comprises: decoding the at least one code block by combining the transmission and the retransmission.

18. The method of claim 15, wherein the decoding comprises:

decoding the retransmission;

designating successfully decoded bits of the retransmission as frozen bits; and

decoding remaining bits of the at least one code block that are not decoded from the retransmission based on the transmission.

19. The method of claim 15, wherein the retransmitted CSI comprises only a portion of the CSI.

20. The method of claim 15, wherein receiving the retransmission comprises: receiving a retransmission of the portion of the code block in a preconfigured retransmission opportunity, wherein the triggering comprises detecting the retransmission opportunity.

21. The method of claim 20, wherein a retransmission opportunity is configured between every two transmissions of the control channel.

22. The method of claim 15, further comprising: transmitting a decoding result for the transmission of the at least one code block, wherein the retransmission is based on the decoding result.

23. The method of claim 22, further comprising: transmitting the decoding result on a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH).

24. The method of claim 23, wherein transmitting the decoding result comprises: transmitting the decoding result in the PHICH only if the PHICH is not scheduled to include feedback on transmissions received on a Physical Uplink Shared Channel (PUSCH).

25. The method of claim 22, further comprising: transmitting the decoding result as part of Downlink Control Information (DCI).

26. The method of claim 15, wherein the DCI comprises additional bits to indicate the decoding result.

27. The method of claim 22, further comprising: transmitting the decoding result on a channel configured to indicate the decoding result.

28. The method of claim 15, wherein the control channel comprises a Physical Uplink Control Channel (PUCCH).

29. An apparatus for wireless communications by a User Equipment (UE), comprising:

means for transmitting at least one code block of a control channel, the at least one code block comprising Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to a bit channel in a particular reliability order of the bit channel;

means for detecting a trigger; and

means for retransmitting at least a portion of each code block in response to the trigger, the portion including retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to the bit channels in a reverse order of reliability of the bit channels as compared to polarity encoding of the CSI.

30. An apparatus for wireless communications by a Base Station (BS), comprising:

means for receiving a transmission of at least one code block of a control channel, the at least one code block comprising Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indices of the code block to a bit channel in a particular reliability order of the bit channel;

means for receiving a retransmission of at least a portion of each code block, the portion including retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to the bit channels in an inverse order of reliability of the bit channels as compared to polarity encoding of the CSI; and

means for decoding the at least one code block based on the transmission and the retransmission.

Technical Field

The present disclosure relates generally to wireless communication systems, and more particularly, to methods and apparatus for Physical Uplink Control Channel (PUCCH) retransmission for ultra-reliable low latency communications (URLLC).

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). Examples of such multiple-access techniques include Long Term Evolution (LTE) systems, 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

In some examples, a wireless multiple-access communication system may include several base stations, each supporting communication for multiple communication devices (otherwise referred to as User Equipments (UEs)) simultaneously. In an LTE or LTE-a network, a set of one or more base stations may define an evolved node B (eNB). In other examples (e.g., in a next generation or 5 th generation (5G) network), a wireless multiple-access communication system may include a number of Distributed Units (DUs) (e.g., Edge Units (EUs), Edge Nodes (ENs), Radio Heads (RHs), intelligent radio heads (SRHs), Transmission Reception Points (TRPs), etc.) in communication with a number of Central Units (CUs) (e.g., Central Nodes (CNs), Access Node Controllers (ANCs), etc.), wherein a set including one or more distributed units in communication with a central unit may define an access node (e.g., a new radio base station (NR BS), a new radio B node (NR NB), a network node, a 5G NB, an eNB, etc.). A base station or DU may communicate with a group of UEs on downlink channels (e.g., for transmissions from or to the base station) and uplink channels (e.g., for transmissions from the UEs to the base station or distributed unit).

These multiple access techniques have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate on a city, country, region, and even global level. An example of an emerging telecommunications standard is New Radio (NR), e.g., 5G radio access. NR is an enhanced set of LTE mobile standards promulgated by the third generation partnership project (3 GPP). It is designed to better support mobile broadband internet access 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), and to support beamforming, Multiple Input Multiple Output (MIMO) antenna techniques, and carrier aggregation.

However, as the demand for mobile broadband access continues to grow, there is a desire for further improvements in NR technology. Preferably, these improvements should be applicable to other multiple access techniques and telecommunications standards employing these techniques.

SUMMARY

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 which 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 provide a method for wireless communications by a User Equipment (UE). The method generally includes: transmitting at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to bit channels in a particular reliability order of the bit channels; detecting a trigger; and retransmitting at least a portion of each code block in response to the trigger, the portion including the retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to bit channels in reverse order of their reliability as compared to the polarity encoding of the CSI.

Certain aspects of the present disclosure provide a method for wireless communications by a Base Station (BS). The method generally includes: receiving a transmission of at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to bit channels in a particular reliability order of the bit channels; receiving a retransmission of at least a portion of each code block, the portion including retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to bit channels in an inverse order of their reliability as compared to the polarity encoding of the CSI; and decoding the at least one code block based on the transmission and the retransmission.

Certain aspects of the present disclosure provide an apparatus for wireless communications by a User Equipment (UE). The apparatus generally comprises: means for transmitting at least one code block of a control channel, the at least one code block comprising Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to bit channels in a particular reliability order of the bit channels; means for detecting a trigger; and means for retransmitting at least a portion of each code block in response to the trigger, the portion including the retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to bit channels in an inverse order of their reliability as compared to the polarity encoding of the CSI.

Certain aspects of the present disclosure provide an apparatus for wireless communications by a Base Station (BS). The apparatus generally comprises: means for receiving a transmission of at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polarity encoded by assigning bit indexes of the code block to bit channels in a particular reliability order of the bit channels; means for receiving a retransmission of at least a portion of each code block, the portion including retransmitted CSI, wherein the portion is polarity encoded by assigning bit indices of the retransmitted CSI to bit channels in an inverse order of their reliability as compared to the polarity encoding of the CSI; and means for decoding the at least one code block based on the transmission and the retransmission.

Aspects generally include methods, apparatus, systems, computer-readable media, and processing systems substantially as described herein with reference to and as illustrated by the accompanying figures.

To the accomplishment of the foregoing and related ends, the 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 present description is intended to include all such aspects and their equivalents.