Method and apparatus for inter-UE coordination signaling
Methods and apparatus for inter-UE coordination signaling in a wireless communication system. A method of operating a UE includes receiving a first SCI format 1-A from a first UE and a second SCI format 1-A from a second UE. The first SCI format 1-A includes a first priority value p 1 and reserves a first SL resource. The second SCI format 1-A includes a second priority value p 2 and reserves a second SL resource. The method further includes identifying a conflict when the first and second SL reserved resources overlap in time and frequency; determining, based on the priority values, whether to indicate conflict information to the first UE or the second UE; and transmitting a PSFCH with the conflict information. When p 1 >p 2 , the conflict information is indicated to the first UE and, when p 1 =p 2 , the conflict information is indicated to the first UE or the second UE.
1 . A first user equipment (UE) in a wireless communication system, the first UE comprising:
a transceiver configured to:
receive first sidelink (SL) control information (SCI), from a second UE, on a physical SL control channel (PSCCH), wherein the first SCI includes first information related to a first SL resource which is a reserved resource, and
receive second SCI, from a third UE, on the PSCCH, wherein the second SCI includes second information related to a second SL resource which is a reserved resource; and
a processor operably coupled to the transceiver, the processor configured to:
identify a conflict on the first SL resource when;
the first UE is an intended recipient of the first SL resource, and RSRP 2 >RSRP 1 +a reference signal received power (RSRP) threshold, where RSRP 1 is a RSRP of the second UE and RSRP 2 is a RSRP of the third UE
wherein the transceiver is further configured to transmit, to the second UE, a physical SL feedback channel (PSFCH) including conflict information when the conflict is identified on the first SL resource, and
wherein first physical resource blocks (PRBs) for the PSFCH including the conflict information are different from second PRBs for another PSFCH including hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback information for a physical SL shared channel (PSSCH).
2 . The first UE of claim 1 , wherein wherein the RSRP threshold is based on a priority value of the second UE included in the first SCI and a priority value of the third UE included in the second SCI.
3 . The first UE of claim 1 , wherein the conflict information is transmitted in a first slot on the PSFCH, after a slot in which the first SCI is received.
4 . The first UE of claim 1 , wherein:
the processor is further configured to identify a value associated with a cyclic shift for the PSFCH,
the value is 0 when the conflict information is transmitted on the PSFCH.
5 . The first UE of claim 1 , wherein the conflict is identified when:
the first UE is an intended recipient of the second SL resource, and
RSRP 1 >RSRP 2 +the RSRP threshold.
6 . The first UE of claim 1 , wherein:
the first and second SCI each include a flag indicating whether the second and third UEs, respectively, are able to receive the conflict information,
when a value of the flag is ‘0’, the respective second or third UE is not able to receive the conflict information, and
when a value of the flag is ‘1’, the respective second or third UE is able to receive the conflict information.
7 . The first UE of claim 1 , wherein the transceiver is further configured to transmit the PSFCH including the conflict information after at least a time gap, sl-MinTimeGapPSFCH, from reception of the first SCI or the second SCI.
8 . The first UE of claim 1 , wherein the transceiver is further configured to transmit the PSFCH including the conflict information with a priority value set to a smallest priority value among a priority value of the second UE included in the first SCI and a priority value of the third UE included in the second SCI.
9 . A method of operating a first user equipment (UE), the method comprising:
receiving first sidelink (SL) control information (SCI), from a second UE, on a physical SL control channel (PSCCH), wherein the first SCI includes first information related to a first SL resource which is a reserved resource;
receiving second SCI, from a third UE, on the PSCCH, wherein the second SCI includes second information related to a second SL resource which is a reserved resource;
identifying a conflict on the first SL resource when:
the first UE is an intended recipient of the first SL resource, and
RSRP 2 >RSRP 1 +a reference signal received power (RSRP) threshold, where RSRP 1 is a RSRP of the second UE and RSRP 2 is a RSRP of the third UE; and
transmitting, to the second UE, a physical SL feedback channel (PSFCH) including conflict information when the conflict is identified on the first SL resource, and
wherein first physical resource blocks (PRBs) for the PSFCH including the conflict information are different from second PRBs for another PSFCH including hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback information for a physical SL shared channel (PSSCH).
10 . The method of claim 9 , wherein the RSRP threshold is based on a priority value of the second UE included in the first SCI and a priority value of the third UE included in the second SCI.
11 . The method of claim 9 , wherein the conflict information is transmitted in a first slot on the PSFCH, after a slot in which the first SCI is received.
12 . The method of claim 9 , further comprising:
identifying a value associated with a cyclic shift for the PSFCH,
wherein the value is 0 when the conflict information is transmitted on the PSFCH.
13 . The method of claim 9 , wherein identifying the conflict further comprises identifying the conflict when:
the first UE is an intended recipient of the second SL resource, and
RSRP 1 >RSRP 2 +the RSRP threshold.
14 . The method of claim 9 , wherein:
the first and second SCI each include a flag indicating whether the first and second UEs, respectively, are able to receive the conflict information,
when a value of the flag is ‘0’, the respective second or third UE is not able to receive the conflict information, and
when a value of the flag is ‘1’, the respective second or third UE is able to receive the conflict information.
15 . The method of claim 9 , wherein transmitting the PSFCH further comprises transmitting the PSFCH including the conflict information after at least a time gap, sl-MinTimeGapPSFCH, from reception of the first SCI or the second SCI.
16 . The method of claim 9 , wherein transmitting the PSFCH further comprises transmitting the PSFCH including the conflict information with a priority value set to a smallest priority value among a priority value of the second UE included in the first SCI and a priority value of the third UE included in the second SCI.
17 . A second user equipment (UE) in a wireless communication system, the second UE comprising:
a processor; and
a transceiver operably coupled with the processor, the transceiver configured to:
transmit, to a first UE, first sidelink (SL) control information (SCI) on a physical SL control channel (PSCCH), wherein the SCI includes first information related to a first SL resource which is a reserved resource, and
receive, from the first UE, conflict information on a physical SL feedback channel (PSFCH) when a conflict is identified on the first SL resource,
wherein the conflict is identified on the first SL resource when:
the first UE is an intended recipient of the first SL resource, and
RSRP 2 >RSRP 1 +a reference signal received power (RSRP) threshold, where RSRP 1 is a RSRP of the second UE and RSRP 2 is a RSRP of a third UE.
18 . The second UE of claim 17 , wherein the processor is further configured to identify whether to transmit a data on the first SL resource based on the conflict information.
19 . The second UE of claim 17 , wherein the conflict information is received in a first slot on the PSFCH, after a slot in which the first SCI is transmitted.
20 . The second UE of claim 17 , wherein a value associated with a cyclic shift for the PSFCH is 0 in cast that the conflict information is received on the PSFCH.