EP-4416882-B1 - FEEDBACK STAGGERING OR MUTING FOR NETWORK CODING

EP4416882B1EP 4416882 B1EP4416882 B1EP 4416882B1EP-4416882-B1

Inventors

LIU, GUANGYI
SARKIS, GABI
NGUYEN, Tien Viet
GULATI, KAPIL
WU, SHUANSHUAN

Dates

Publication Date: 20260513
Application Date: 20220922

Claims (15)

An apparatus for wireless communication at a user equipment, UE, comprising: memory; and at least one processor coupled to the memory and configured to cause the UE to: receive an indication to use staggered feedback for a network coding packet, wherein the network coding packet includes an encoded combination of multiple packets for reception by multiple UEs including the UE, and wherein the feedback from the UE for the network coding packet is staggered in a different time period than additional feedback for the network coding packet from one or more different UEs of the multiple UEs; receive the network coding packet; determine a single time period to send the feedback from the UE for the network coding packet among multiple feedback time periods for the network coding packet; and transmit the feedback from the UE for the network coding packet in the single time period among the multiple feedback time periods for the network coding packet.
The apparatus of claim 1, further comprising: at least one antenna coupled to the at least one processor, wherein the multiple feedback time periods for the network coding packet correspond to multiple physical sidelink feedback channel, PSFCH, slots, and wherein the single time period for the UE to provide the feedback from the UE for the network coding packet is more than one PSFCH slot after the network coding packet.
The apparatus of claim 2, wherein a number of the multiple PSFCH slots is based on a number of coded transport blocks, TBs, in the network coding packet.
The apparatus of claim 2, wherein a number of the multiple PSFCH slots is based on a delay budget of packets comprised in the network coding packet.
The apparatus of claim 1, wherein the indication is comprised in a header of the network coding packet.
The apparatus of claim 1, wherein the indication is comprised in a configuration for the UE.
The apparatus of claim 1, wherein the single time period is based on one of the following: i) a UE identifier, ID, and a packet ID for the network coding packet; ii) a corresponding distance from an encoding device; iii) a packet priority associated with the feedback; or iv) a packet expiration time associated with the feedback.
The apparatus of claim 1, wherein the at least one processor is further configured to cause the UE to: receive an additional indication indicating to skip sending the feedback for an additional network coding packet.
The apparatus of claim 8, wherein: i) the additional indication is based on the UE being within a distance of an encoding device; or ii) wherein the at least one processor are further configured to cause the UE to: measure a reference signal received power of a signal from an encoding device that is higher than a threshold; and skip a transmission of the feedback for the additional network coding packet.
A method of wireless communication at a user equipment, UE, comprising: receiving an indication to use staggered feedback for a network coding packet, wherein the network coding packet includes an encoded combination of multiple packets for reception by multiple UEs including the UE, and wherein the feedback from the UE for the network coding packet is staggered in a different time period than additional feedback for the network coding packet from one or more different UEs of the multiple UEs; receiving the network coding packet; determining a single time period to send the staggered feedback from the UE for the network coding packet among multiple feedback time periods for the network coding packet; and transmitting the feedback from the UE for the network coding packet in the single time period among the multiple feedback time periods for the network coding packet.
An apparatus for wireless communication at an encoding device, comprising: memory; and at least one processor coupled to the memory and configured to cause the encoding device to: transmit an indication for a plurality of user equipments, UEs, to use staggered feedback for a network coding packet across multiple feedback time periods associated with the network coding packet, wherein the network coding packet includes an encoded combination of multiple packets for reception by the plurality of UEs; transmit the network coding packet; and receive feedback from the plurality of UEs across the multiple feedback time periods, wherein the feedback for the network coding packet from different UEs of the plurality of UEs is staggered in different feedback time periods of the multiple feedback time periods.
The apparatus of claim 11, further comprising one of the following: i) at least one antenna coupled to the at least one processor, wherein the multiple feedback time periods correspond to multiple physical sidelink feedback channel, PSFCH, slots, and the multiple feedback time period includes at least one time period that is multiple PSFCH slots after the network coding packet; ii) wherein the indication is comprised in a header of the network coding packet; iii) wherein the indication is comprised in a configuration for the plurality of UEs; iv) wherein to receive the feedback from the plurality of UEs across the multiple feedback time periods, the at least one processor is further configured to cause the encoding device to: receive the feedback for each UE in a time period based on a corresponding UE identifier, ID, and a packet ID for the network coding packet. v) wherein to receive the feedback from the plurality of UEs across the multiple time periods, the at least one processor is further configured to receive the feedback for each UE in a time period based on a corresponding distance from the encoding device; vi) wherein to receive the feedback from the plurality of UEs across the multiple feedback time periods, the at least one processor is further configured to: receive the feedback for each UE in a time period based on a packet priority associated with a corresponding feedback; vii) wherein to receive the feedback from the plurality of UEs across the multiple feedback time periods, the at least one processor is further configured to: receive the feedback for each UE in a time period based on a packet expiration time associated with a corresponding feedback; viii) the at least one processor is further configured to cause the encoding device to: indicate for one or more UEs to skip sending the feedback for the network coding packet.
The apparatus of claim 12, option i), further comprising one of the following: i) wherein a number of the multiple PSFCH slots is based on at least one of a number of UEs or a number of coded transport blocks, TBs, in the network coding packet; ii) wherein a number of the multiple PSFCH slots is based on a delay budget of packets comprised in the network coding packet; iii) wherein to transmit the indication, the at least one processor is further configured to cause the encoding device to: transmit the indication for the plurality of UEs to provide the staggered feedback across the multiple PSFCH slots in response to an amount of feedback resources for the network coding packet being larger than a threshold; iv) wherein the at least one processor is further configured to cause the encoding device to: allocate a different number of physical sidelink feedback channel resources for the network coding packet across the multiple PSFCH slots; v) wherein the at least one processor is further configured to cause the encoding device to: allocate a same number of physical sidelink feedback channel resources for the network coding packet across the multiple PSFCH slots.
The apparatus of claim 12, option viii), wherein the one or more UEs are within a distance of the encoding device or measure a reference signal received power of a signal from the encoding device that is higher than a threshold.
A method of wireless communication at an encoding device, comprising: transmitting an indication for a plurality of user equipments, UEs, to use staggered feedback for a network coding packet across multiple time periods associated with the network coding packet, wherein the network coding packet includes an encoded combination of multiple packets for reception by the plurality of UEs; transmitting the network coding packet; and receiving feedback from the plurality of UEs across the multiple feedback time periods, wherein the feedback for the network coding packet from different UEs of the plurality of UEs is staggered in different feedback time periods of the multiple feedback time period.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of U.S. Patent Application Serial No. 17/450,942, entitled "FEEDBACK STAGGERING OR MUTING FOR NETWORK CODING" and filed on October 14, 2021. TECHNICAL FIELD The present disclosure relates generally to communication systems, and more particularly, to wireless communication including network coding. INTRODUCTION Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. 3GPP document R1-082474 "Uplink ACK/NACK Repetition" from Motorola, 3GPP TSG RAN1 Meeting #53-Bis, Warsaw, Poland, June 29 - July 4, 2008, investigates various uplink ACK/ NACK repetition methods to ensure balanced uplink coverage. Especially, a RRC message can indicate the ACK/NACK repetition with one bit, and the number of ACK/NACK repetitions is related to the allocation of CCEs for PDCCH reception. It is suggested also to reserve resources for repeated ACK/ NACK. 3GPP document R1-081796 "Ack/Nack repetition and Implicit Resource Allocation for PUCCH", from Panasonic, 3GPP TSG RAN WG1 Meeting #53, Kansas City, USA, May 5 - 9, 2008, discloses that UL ACK/NACK repetition is required to only UEs having difficult condition like cell edge. The number of ACK/NACK repetitions is linked to the aggregation level of the DL grant. The first ACK/NACK is transmitted in subframe x after receiving the PDSCH using PUCCH resource for the first repetition. The second and third ACK/NACK are transmitted in next subframes x+1 and x+2 using PUCCH resources reserved for the second and third repetitions respectively. 3GPP document R2-1907344 "HARQ procedure for SL groupcast" from Ericsson, 3GPP TSG-RAN WG2 Meeting #106, Reno, USA, May 13 - May 17, 2019, discloses that both RSRP based and distance based HARQ feedback need to be supported and can be (pre-)configured. Also, it may happen that a network (pre-)configure a UE to use both RSRP and distance and in this case, a UE is only allowed to skip HARQ feedback transmission when both criteria are not met. BRIEF SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. Aspects of the present invention are set out in the appended claims. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at an encoding device. The apparatus transmits an indication for a plurality of user equipments (UEs) to provide feedback for a network coding packet across multiple time periods. The apparatus transmits the network coding packet and receives the feedback from the plurality of UEs across the multiple time periods. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at a UE. The apparatus receives an indication to provide feedback for a network coding packet that is staggered in a different time period than a baseline tim