公开(公告)号：US20230327822A1

公开(公告)日：2023-10-12

申请号：US18040131

申请日：2021-08-04

Applicant: NOKIA TECHNOLOGIES OY

Inventor： Vinh VAN PHAN ,  Ling YU ,  Lianghai JI ,  Faranaz SABOURI-SICHAN ,  Rudraksh SHRIVASTAVA ,  Sudeep HEGDE

IPC: H04L1/1867

CPC classification number: H04L1/1887 ,  H04L1/1896

Abstract: An ARQ system for sidelink communication between transmitter and receiver, with the help of cooperative UE, or relay UE is disclosed. The relay intercepts the initial transmission from transmitter to receiver. If the relay does not intercept any ARQ feedback from the receiver (DTX), it retransmits the initial transmission. Upon receiving at least the Sidelink Control Information, SCI, identifying the retransmission, the transmitter terminates the HARQ process, assuming that the relay is now in charge of the retransmission. Upon reception of the retransmission, the receiver feeds back an HARQ ACK to the relay and the transmitter. If the receiver correctly receives the initial transmission, it feeds back an HARQ ACK to the relay and the transmitter and both relay and transmitter stop the HARQ process. If the relay does not successfully receive the initial transmission, it feds back a NACK to the transmitter which performs retransmission to the relay.