A first wireless transmit/receive unit (WTRU) comprising circuitry, including any of a transmitter, a receiver, a processor, and a memory, wherein the circuitry is configured to:
- receive, from a second WTRU, first information indicating one or more service-specific side link paging configurations of a plurality of service-specific side link paging configurations, wherein each service-specific side link paging configuration associated with a respective one of a plurality of side link services, and wherein the service-specific side link paging configurations associated with different side link services have at least one of different paging resources, different paging periodicities or different lengths of paging occasions;
- receive one or more transmissions based on the indicated one or more service-specific side link paging configurations, wherein the one or more transmissions indicate whether the second WTRU is being paged for at least one side link service of the plurality of side link services;
- on a condition that the second WTRU is being paged, receive one or more side link messages associated with the at least one side link service and directed to the second WTRU;
- transmit, to the second WTRU, side link paging information indicating an availability of the received one or more side link messages;
- and
- transmit, to the second WTRU, the received one or more side link messages.