Method and apparatus for improving retransmission scheduling of sidelink communication in a wireless communication system

Patent metadata

Field	Value
Publication number	US-2020275474-A1
Application number	US-202016797577-A
Country	US
Kind code	A1
Filing date	Feb 21, 2020
Priority date	Feb 21, 2019
Publication date	Aug 27, 2020
Grant date	—

Abstract

Methods and apparatuses for improving retransmission scheduling of sidelink communications are disclosed herein. In one method, a first device monitors a down control signal for scheduling sidelink resource. The first device performs a sidelink transmission for a second device based on a first sidelink grant allocated by a base station. The first device determines a retransmission need of the sidelink transmission based on a Hybrid Automatic Repeat Request (HARQ) feedback of the sidelink transmission from the second device. The first device transmits a retransmission indication for the retransmission need to the base station. The first device starts or restarts a timer upon the transmission of the retransmission indication, wherein the timer is used for controlling a period of monitoring a downlink control resource set.

First claim

1 . A method for a first device to monitor down control signal for scheduling sidelink resource, the method comprising:
performing a sidelink transmission for a second device based on a first sidelink grant allocated by a base station; determining a retransmission need of the sidelink transmission based on a Hybrid Automatic Repeat Request (HARQ) feedback of the sidelink transmission from the second device; transmitting a retransmission indication for the retransmission need to the base station; and starting or restarting a timer upon the transmission of the retransmission indication, wherein the timer is used for controlling a period of monitoring a downlink control resource set.

2 . The method of claim 1 , wherein the sidelink transmission needs to receive the HARQ feedback from the second device through a sidelink interface.

3 . The method of claim 1 , further comprising:
transmitting the retransmission indication to the base station if the first device does not receive the HARQ feedback from the second device.

4 . The method of claim 1 , further comprising:
transmitting the retransmission indication to the base station if the HARQ feedback from the second device indicates a reception failure of the sidelink transmission.

5 . The method of claim 1 , wherein the timer is a drx-InactivityTimer or a drx-RetransmissionTimerSL.

6 . The method of claim 1 , wherein the downlink control resource set is a Physical Dowlink Control Channel (PDCCH) or a coreset.

7 . The method of claim 1 , wherein the downlink control resource set includes a set of PDCCH occasions.

8 . A User Equipment (UE), the UE comprising:
a control circuit;
a processor installed in the control circuit; and
a memory installed in the control circuit and coupled to the processor;
wherein the processor is configured to execute a program code stored in the memory to:
perform a sidelink transmission for a second device based on a first sidelink grant allocated by a base station;
determine a retransmission need of the sidelink transmission based on a Hybrid Automatic Repeat Request (HARQ) feedback of the sidelink transmission from the second device;
transmit a retransmission indication for the retransmission need to the base station; and
start or restart a timer upon the transmission of the retransmission indication, wherein the timer is used for controlling a period of monitoring a downlink control resource set.

9 . The UE of claim 8 , wherein the sidelink transmission needs to receive the HARQ feedback from the second device through a sidelink interface.

10 . The UE of claim 8 , wherein the processor is configured to execute the program code to transmit the retransmission indication to the base station if the first device does not receive the HARQ feedback from the second device

11 . The UE of claim 8 , wherein the processor is configured to execute the program code to transmit the retransmission indication to the base station if the HARQ feedback from the second device indicates a reception failure of the sidelink transmission.

12 . The UE of claim 8 , wherein the timer is a drx-InactivityTimer or a drx-RetransmissionTimerSL.

13 . The UE of claim 8 , wherein the downlink control resource set is a Physical Dowlink Control Channel (PDCCH) or a coreset.

14 . The UE of claim 8 , wherein the downlink control resource set includes a set of PDCCH occasions.

Assignees

• Asustek Comp Inc

Inventors

• Chen Wei-Yu

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/25

  between terminals via a wireless link, e.g. sidelink · CPC title

• H04L1/1864

  ARQ related signaling (H04L1/1607 takes precedence) · CPC title

• H04L1/188

  Time-out mechanisms · CPC title

• H04L1/1812 Primary

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title