NR sidelink discontinuous reception

Patent metadata

Field	Value
Publication number	US-12477541-B2
Application number	US-202017784431-A
Country	US
Kind code	B2
Filing date	Dec 11, 2020
Priority date	Dec 13, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

SL DRX mechanism is used for power savings, to address a number of sidelink non-vehicular sidelink use cases. Methods, systems, and apparatuses, among other things, as described herein may use 1) A sidelink state model to describe the UE behavior for sidelink DRX operation. The DRX operation tailored to each of the sidelink states; 2) Power savings opportunities during SL operation, in addition to stopping PSCCH monitoring; 3) Various DRX models applicable to the sidelink; 4) SL_DRX operation for the SL UnLinked state; or 5) SL DRX operation for the SL_Linked state.

First claim

What is claimed:

1 . A first wireless transmit/receive unit (WTRU) comprising:
a processor configured to: send assistance information to a second WTRU, the assistance information associated with a sidelink (SL) discontinuous reception (SL DRX) configuration; receive a configuration request from the second WTRU after sending the assistance information associated with the SL DRX configuration, the configuration request comprising SL DRX configuration information; determine whether to accept the SL DRX configuration information or to reject the SL DRX configuration information; on condition of determining to reject the SL DRX configuration information, send a message to the second WTRU, the message comprising an indication of rejection of the SL DRX configuration information; and on condition of determining to accept the SL DRX configuration information, send the SL DRX configuration information to a network.

2 . The first WTRU of claim 1 , wherein the processor is configured to monitor one or more of SL control information (SCI) or a physical shared control channel (PSCCH) during an active time of the SL DRX configuration.

3 . The first WTRU of claim 1 , wherein the SL DRX configuration information comprises one or more of a retransmission time period for SL DRX, a time period for SL DRX inactivity, a delay before starting a duration of an on period of a cycle of SL DRX, a duration of an on period of a cycle of SL DRX, or a minimum duration before a SL assignment for hybrid automatic repeat request (HARQ) retransmission is expected.

4 . The first WTRU of claim 1 , wherein the assistance information comprises one or more of a number of active SL communications for the first WTRU, a preferred SL DRX configuration, timing information of the SL DRX, or an indication that the first WTRU is requesting SL DRX for a certain resource pool, frequency, sidelink BWP, sidelink service type, cast type, or the second WTRU.

5 . The first WTRU of claim 1 , wherein the assistance information and configuration request are transmitted over a PC5 Radio Resource Control (RRC) message or over a medium access control (MAC) Control Element (CE).

6 . A method performed by a first wireless transmit/receive unit (WTRU), the method comprising:
sending assistance information to a second WTRU, the assistance information associated with a sidelink (SL) discontinuous reception (SL DRX) configuration; receiving a configuration request from the second WTRU after sending the assistance information associated with the SL DRX configuration, the configuration request comprising SL DRX configuration information; determining whether to accept the SL DRX configuration information or to reject the SL DRX configuration information; on condition of determining to reject the SL DRX configuration information, sending a message to the second WTRU, the message comprising an indication of rejection of the SL DRX configuration information; and on condition of determining to accept the SL DRX configuration information, sending the SL DRX configuration information to a network.

7 . The method of claim 6 , wherein the SL DRX configuration information comprises one or more of a retransmission time period for SL DRX, a time period for SL DRX inactivity, a delay before starting a duration of an on period of a cycle of SL DRX, a duration of an on period of a cycle of SL DRX, or a minimum duration before a SL assignment for hybrid automatic repeat request (HARQ) retransmission is expected.

8 . The method of claim 6 , wherein the assistance information comprises one or more of a number of active SL communications for the first WTRU, a preferred SL DRX configuration, timing information of the SL DRX, or an indication that the first WTRU is requesting SL DRX for a certain resource pool, frequency, sidelink BWP, sidelink service type, cast type, or the second WTRU.

9 . The method of claim 6 , wherein the assistance information and configuration request message are transmitted over a PC5 Radio Resource Control (RRC) message or over a medium access control (MAC) Control Element (CE).

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Di Girolamo Rocco
• Adjakple Pascal
• Li Qing
• Chen Zhuo
• Murray Joseph
• Pan Kyle

Classifications

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title

• H04W76/28 Primary

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04W4/46

  for vehicle-to-vehicle communication [V2V] · CPC title

• H04L1/1812

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

• H04W28/0278

  using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12) · CPC title