Method and apparatus for listen before talk for sidelink transmission in a wireless communication system

Patent metadata

Field	Value
Publication number	US-12302394-B2
Application number	US-202217886512-A
Country	US
Kind code	B2
Filing date	Aug 12, 2022
Priority date	Aug 13, 2021
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

In an example from the perspective of a first User Equipment (UE), in response to performing successful listen before talk (LBT), the first UE determines a channel occupancy time (COT). The first UE determines whether or not a second sidelink transmission, to be performed by a second UE, is within the COT. The first UE determines information, associated with LBT type and/or cyclic prefix (CP) extension, for inclusion in a first sidelink transmission in the COT, wherein whether the information includes first information associated with LBT type and/or CP extension or the information includes second information associated with LBT type and/or CP extension is based on the determination of whether or not the second sidelink transmission is within the COT. The UE transmits, to the second UE, the first sidelink transmission in the COT. The first sidelink transmission includes the information. The second sidelink transmission is associated with the first sidelink transmission.

First claim

The invention claimed is:

1. A method of a second User Equipment (UE), the method comprising:
receiving a first sidelink transmission from a first UE, wherein the first sidelink transmission comprises channel occupancy time (COT) sharing information;
based on the COT sharing information, determining whether or not a second sidelink transmission, to be performed by the second UE, is within a COT initiated by the first UE;
in response to the second sidelink transmission being within the COT initiated by the first UE, prioritizing at least one of data, one or more logical channels (LCHs) or one or more Medium Access Control Control Elements (MAC CEs) associated with the first UE for the second sidelink transmission, wherein the prioritizing is used for selecting a destination, associated with the first UE, for the second sidelink transmission, wherein:
the destination comprises at least one of:
a destination identifier (ID) of the first UE;
a groupcast destination ID of a group comprising the first UE; or
a broadcast destination ID; and

the second sidelink transmission comprises data with a channel access priority class (CAPC) value that is the same or lower than a specific CAPC value which is included in the COT sharing information transmitted by the first UE; and

in response to performing successful listen before talk (LBT), transmitting the second sidelink transmission to the selected destination associated with the first UE.

2. The method of claim 1 , comprising:
one of:
based on the second sidelink transmission, to be performed by the second UE, being within the COT, performing short listen before talk (LBT) at least one of before performing the second sidelink transmission or for performing the second sidelink transmission; or
based on the second sidelink transmission, to be performed by the second UE, being at least partially outside the COT, performing long LBT at least one of before performing the second sidelink transmission or for performing the second sidelink transmission; and

transmitting the second sidelink transmission to the first UE in response to successful LBT comprising the short LBT or the long LBT.

3. The method of claim 1 , wherein the COT sharing information comprises at least one of:
an indication of whether or not to share the COT;
a shared starting timing of the COT;
a shared ending timing of the COT;
at least one of an ending position of the COT or an ending timing of the COT;
a remaining COT duration of the COT;
an energy threshold for the COT;
at least one of a channel access type or a LBT type; or
a CP extension.

4. The method of claim 1 , wherein at least one of:
the second sidelink transmission is a Physical Sidelink Feedback Channel (PSFCH) transmission comprising Sidelink Hybrid Automatic Repeat Request (SL HARQ) feedback associated with the first sidelink transmission;
the first sidelink transmission is at least one of a Physical Sidelink Shared Channel (PSSCH) transmission or a Physical Sidelink Control Channel (PSCCH) transmission;
SL HARQ feedback is enabled for the first sidelink transmission; or
the first sidelink transmission is associated with a first Sidelink Control Information (SCI) format indicative of the COT sharing information and a set of information associated with at least one of listen before talk (LBT) type or cyclic prefix (CP) extension.

5. The method of claim 1 , wherein at least one of:
Sidelink Hybrid Automatic Repeat Request (SL HARQ) feedback is disabled for the first sidelink transmission; or
the first sidelink transmission is associated with a second Sidelink Control Information (SCI) format indicative of the COT sharing information without information associated with at least one of listen before talk (LBT) type or cyclic prefix (CP) extension.

6. The method of claim 1 , wherein at least one of:
the destination ID of the first UE is signaled by sidelink control information (SCI);
the groupcast destination ID of the group comprising the first UE is signaled by SCI; or
the broadcast destination ID is signaled by SCI.

7. The method of claim 1 , wherein:
if the first sidelink transmission does not at least one of trigger or request the second sidelink transmission, at least one of:
the second UE at least one of ignores or does not use information associated with at least one of listen before talk (LBT) type or cyclic prefix (CP) extension;
the first sidelink transmission is not indicative of information associated with at least one of LBT type or CP extension;
the COT sharing information is not indicative of information associated with at least one of LBT type or CP extension; or
the first sidelink transmission is associated with a second Sidelink Control Information (SCI) format indicative of the COT sharing information without information associated with at least one of LBT type or CP extension.

8. The method of claim 1 , wherein at least one of:
the first sidelink transmission and the second sidelink transmission are in a sidelink resource pool;
the second sidelink transmission is associated with the sidelink resource pool;
the sidelink resource pool is in a carrier using shared spectrum channel access;
the COT corresponds to an occupancy time on at least one of a channel in the carrier or one or more resources in the carrier;
if the sidelink resource pool is configured with Physical Sidelink Feedback Channel (PSFCH), the first sidelink transmission is associated with a first Sidelink Control Information (SCI) format indicative of the COT sharing information and a set of information associated with at least one of listen before talk (LBT) type or cyclic prefix (CP) extension; or
if the sidelink resource pool is not configured with PSFCH, the first sidelink transmission is associated with a second SCI format indicative of the COT sharing information without information associated with at least one of LBT type or CP extension.

9. A second User Equipment (UE), comprising:
a control circuit;
a processor installed in the control circuit; and
a memory installed in the control circuit and operatively coupled to the processor, wherein the processor is configured to execute a program code stored in the memory to perform operations, the operations comprising:
receiving a first sidelink transmission from a first UE, wherein the first sidelink transmission comprises channel occupancy time (COT) sharing information;
based on the COT sharing information, determining whether or not a second sidelink transmission, to be performed by the second UE, is within a COT initiated by the first UE;
in response to the second sidelink transmission being within the COT initiated by the first UE, prioritizing at least one of data, one or more logical channels (LCHs) or one or more Medium Access Control Control Elements (MAC CEs) associated with the first UE for the second sidelink transmission, wherein the prioritizing is used for selecting a destination, associated with the first UE, for the second sidelink transmission, wherein:
the destination comprises at least one of:
a destination identifier (ID) of the first UE;
a groupcast destination ID of a group comprising the first UE; or
a broadcast destination ID; and

the second sidelink transmission comprises data with a channel access priority class (CAPC) value that is the same or lower than a specific CAPC value which is included in the COT sharing information transmitted by the first UE; and

in response to performing successful listen before talk (LBT), transmitting the second sidelink transmission to the selected destination associated with the first UE.

10. The second UE of claim 9 , comprising:
one of:
based on the second sidelink transmissi

Assignees

• Asustek Comp Inc

Inventors

• Huang Chun-Wei
• Li Ming-Che
• Tseng Li-Chih
• Kung Yi-Hsuan

Classifications

• H04L1/1812

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

• H04W74/002

  Transmission of channel access control information · CPC title

• H04W92/18

  between terminal devices · CPC title

• H04L27/2607

  Cyclic extensions · CPC title

• H04W72/1263

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