Radio (NR) vehicle to vehicle (V2X)—methods for scheduling sidelink in unlicensed spectrum
Methods and apparatuses for scheduling sidelink communications in unlicensed spectrum are disclosed. A method performed by a first wireless transmit/receive unit (WTRU) may comprise: obtaining a grant for transmission on a sidelink (SL); receiving, from a second WTRU or an additional WTRU, a transmission that includes first channel occupancy time (COT) information; on a condition that the grant is for transmission on the SL during a COT associated with the second WTRU or an additional WTRU, determining, from a transmission received from the second WTRU, the additional WTRU, or both the second and the additional WTRU, cast information; performing a listen before talk (LBT) procedure using a set of parameters associated with information received from the second WTRU or additional WTRU; and on a condition that the LBT procedure is successful, transmitting, based on the determined cast information, data that includes second COT information.
1. A method performed by a first wireless transmit/receiver unit (WTRU), the method comprising:
receiving, from a second WTRU that initiates a shared channel occupancy time (COT) with the first WTRU, a sidelink control information (SCI), the SCI including:
(1) COT information, wherein the COT information includes an associated channel access priority class (CAPC) value; and
(2) at least one of: (a) a source ID associated with the second WTRU or (b) a destination ID associated with the second WTRU;
using the shared COT; and
performing a type 2 LBT procedure for a transmission during the shared COT;
wherein if the shared COT is associated with a unicast type, the source ID of the transmission from the first WTRU matches the received destination ID associated with the second WTRU, and the destination ID of the transmission from the first WTRU matches the received source ID associated with the second WTRU,
wherein if the shared COT is associated with a multicast type, the destination ID of the transmission from the first WTRU matches the received destination ID associated with the second WTRU, and
wherein the CAPC value associated with the COT information and the CAPC value associated with the data for transmission have an integer value between 1-4.
2. The method of claim 1 , wherein the first WTRU is a responding WTRU.
3. The method of claim 1 , wherein the second WTRU is an initiating WTRU.
4. The method of claim 1 , wherein the type 2 LBT procedure is performed on a channel associated with the COT based on a determination that that COT can be shared.
5. The method of claim 1 , wherein, on a condition that the type 2 LBT procedure is successful, transmitting data.
6. The method of claim 1 , wherein a lower value of the CAPC value associated with the COT information and the CAPC value associated with data for transmission indicates a higher priority.
7. The method of claim 1 , wherein the SCI further includes a duration of the COT.
8. A first wireless transmit/receiver unit (WTRU) comprising:
a transceiver; and
a processor;
wherein the transceiver and processor are configured to:
receive, from a second WTRU that initiates a shared channel occupancy time (COT) with the first WTRU, a sidelink control information (SCI), the SCI including:
(1) COT information, wherein the COT information includes an associated channel access priority class (CAPC) value; and
(2) at least one of: (a) a source ID associated with the second WTRU or (b) a destination ID associated with the second WTRU;
the shared COT; and
perform a type 2 LBT procedure for a transmission during the shared COT;
wherein if the shared COT is associated with a unicast type, the processor is further configured to match the source ID of the transmission from the first WTRU to the received destination ID associated with the second WTRU, and the destination ID of the transmission from the first WTRU to the received source ID associated with the second WTRU; and
wherein if the shared COT is associated with a multicast type, the processor is further configured to match the destination ID of the transmission from the first WTRU to the received destination ID associated with the second WTRU; and
wherein the CAPC value associated with the COT information and the CAPC value associated with the data for transmission have an integer value between 1-4.
9. The first WTRU of claim 8 , wherein the first WTRU is a responding WTRU.
10. The first WTRU of claim 8 , wherein the second WTRU is an initiating WTRU.
11. The first WTRU of claim 8 , wherein the type 2 LBT procedure is performed on a channel associated with the COT based on a determination that that COT can be shared.
12. The first WTRU of claim 8 , wherein the transceiver is further configured to, on a condition that the type 2 LBT procedure is successful, transmit data.
13. The first WTRU of claim 8 , wherein a lower value of the CAPC value associated with the COT information and the CAPC value associated with data for transmission indicates a higher priority.
14. The first WTRU of claim 8 , wherein the SCI further includes a duration of the COT.