L2 procedures for unicast and/or multicast link establishment and maintenance

Patent metadata

Field	Value
Publication number	US-12501433-B2
Application number	US-201917279272-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Sep 25, 2018
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

Systems, methods, and devices for unicast and/or multicast link establishment and maintenance. A wireless transmit receive unit (WTRU) may send a link establishment request broadcast message, wherein in the link may be for multicast, unicast, or groupcast. The WTRU may receive a link establishment response broadcast message and a connectivity report. The WTRU may then send a link establishment confirmation broadcast message once a multicast or unicast link has been established, at which point the WTRU may send and receive a multicast message. The link establishment request message may be sent based on one or more triggers: receiving a QoS flow, needing a new sidelink radio bearer, determining that a new QoS flow or radio bearer requires network controlled admission control, and/or receive a unicast and/or multicast establishment request. The WTRU may transmit a unicast and/or multicast usability signal (UMUS). The WTRU may preempt the established multicast or unicast link.

First claim

What is claimed is:

1 . A method implemented in a wireless transmit/receive unit (WTRU) for establishing a sidelink radio bearer (SLRB) for a quality of service (QOS) flow, the method comprising:
receiving a plurality of SLRB configurations; mapping the QoS flow to an SLRB configuration, based on one or more values associated with the QoS flow and the plurality of SLRB configurations; and transmitting a sidelink reconfiguration message to a peer WTRU of the WTRU, the sidelink reconfiguration message including a subset of the mapped SLRB configuration associated with the SLRB as received by the WTRU, the subset of the mapped SLRB configuration being based on a capability of the SLRB; receiving a confirmation message from the peer WTRU of the WTRU responsive to the sidelink reconfiguration message; establishing the SLRB responsive to the confirmation message; and transmitting data associated with the QoS flow to the peer WTRU of the WTRU on the established SLRB; wherein at least one value of the one or more values associated with the QOS flow comprises a quality indicator; and wherein the quality indicator comprises a PC5 quality indicator (PQI).

2 . The method of claim 1 , wherein the at least one value associated with the QoS flow comprises a vehicle-to-everything (V2X) service quality indicator (VQI).

3 . The method of claim 1 , wherein the sidelink reconfiguration message comprises a RRCReconfiguration message.

4 . The method of claim 1 , wherein the SLRB configuration associated with the SLRB comprises a logical channel (LCH) configuration, feedback configuration, channel quality indicator (CQI) configuration, and/or flow-to-SLRB mapping.

5 . The method of claim 1 , wherein the subset of the SLRB configuration comprises a logical channel (LCH) configuration, feedback configuration, channel quality indicator (CQI) configuration, and/or flow-to-SLRB mapping.

6 . The method of claim 1 , further comprising triggering establishment of the SLRB responsive to the QoS flow being mapped to the SLRB.

7 . The method of claim 1 , further comprising releasing the SLRB responsive to a condition where no QoS flows are mapped to the SLRB.

8 . A wireless transmit/receive unit (WTRU) configured to establish a sidelink radio bearer (SLRB) for a quality of service (QOS) flow, comprising:
a processor operatively coupled to a transmitter and a receiver; the receiver configured to receive a plurality of SLRB configurations; the processor configured to map the QoS flow to an SLRB configuration based on one or more values associated with the QoS flow and the plurality of SLRB configurations; and the transmitter configured to transmit a sidelink reconfiguration message to a peer WTRU of the WTRU, the sidelink reconfiguration message including a subset of the mapped SLRB configuration associated with the SLRB as received by the WTRU, the subset of the mapped SLRB configuration being based on a capability of the SLRB; the receiver configured to receive a confirmation message from the peer WTRU of the WTRU responsive to the sidelink reconfiguration message; the processor and the transmitter configured to establish the SLRB responsive to the confirmation message; and the transmitter configured to transmit data associated with the QoS flow to the peer WTRU of the WTRU on the established SLRB; wherein at least one value of the one or more values associated with the QoS flow comprises a quality indicator; and wherein the quality indicator comprises a PC5 quality indicator (PQI).

9 . The WTRU of claim 8 , wherein the at least one value associated with the QoS flow comprises a vehicle-to-everything (V2X) service quality indicator (VQI).

10 . The WTRU of claim 8 , wherein the sidelink reconfiguration message comprises a RRCReconfiguration message.

11 . The WTRU of claim 8 , wherein the SLRB configuration associated with the SLRB comprises a logical channel (LCH) configuration, feedback configuration, channel quality indicator (CQI) configuration, and/or flow-to-SLRB mapping.

12 . The WTRU of claim 8 , wherein the subset of the SLRB configuration comprises a logical channel (LCH) configuration, feedback configuration, channel quality indicator (CQI) configuration, and/or flow-to-SLRB mapping.

13 . The WTRU of claim 8 , wherein the processor is further configured to trigger establishment of the SLRB responsive to the QoS flow being mapped to the SLRB.

14 . The WTRU of claim 8 , wherein the processor is further configured to release the SLRB responsive to a condition where no QoS flows are mapped to the SLRB.

15 . A method implemented in a wireless transmit/receive unit (WTRU) for establishing a sidelink radio bearer (SLRB) for a quality of service (QOS) flow, the method comprising:
receiving a plurality of SLRB configurations; mapping the QoS flow to an SLRB configuration based on one or more values associated with the QoS flow and the plurality of SLRB configurations; and transmitting a sidelink RRCReconfiguration message to a peer WTRU of the WTRU, the sidelink RRCReconfiguration message including a subset of the mapped SLRB configuration associated with the SLRB as received by the WTRU, the subset of the mapped SLRB configuration being based on a capability of the SLRB, the sidelink RRCReconfiguration message further including information indicating a gNB on which the WTRU is camped, an area identity currently being used by the WTRU, location information regarding the WTRU, motion-relating information including speed and heading, and group-based scheduling information; receiving a sidelink RRCReconfiguration confirmation message from the peer WTRU of the WTRU responsive to the sidelink RRCReconfiguration message; establishing the SLRB responsive to the sidelink RRCReconfiguration confirmation message; transmitting data associated with the QoS flow to the peer WTRU on the established SLRB; triggering establishment of the SLRB responsive to the QoS flow being mapped to the SLRB; and releasing the SLRB responsive to a condition where no QoS flows are mapped to the SLRB; wherein at least one value of the one or more values associated with the QOS flow comprises a quality indicator; wherein the quality indicator comprises a PC5 quality indicator (PQI); wherein the SLRB configuration comprises a logical channel (LCH) configuration; and wherein the subset comprises a flow-to-SLRB mapping.

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Freda Martino M
• Deng Tao
• Hoang Tuong Duc
• El Hamss Aata
• Perras Michelle

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04W92/18

  between terminal devices · CPC title

• H04W72/25

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

• H04W72/543

  based on requested quality, e.g. QoS · CPC title

• H04W4/40 Primary

  for vehicles, e.g. vehicle-to-pedestrians [V2P] · CPC title