determining one or more configurations, wherein the one or more configurations includes information relating to a sidelink radio link control (SL-RLC) channel;

creating the SL-RLC channel between the relay WTRU and a remote WTRU based on the one or more configurations, wherein the SL-RLC channel is associated with a Uu bearer of the remote WTRU, and wherein the SL-RLC channel is created after a PC5-radio resource control (RRC) connection is established between the relay WTRU and the remote WTRU;

receiving a first message using the SL-RLC channel from the remote WTRU:

on a condition that the relay WTRU is in an IDLE state when the first message is received, transmitting a second message, wherein the second message comprises a request to establish a new connection between the relay WTRU and a network;

on a condition that the relay WTRU is in an INACTIVE state when the first message is received, transmitting a third message, wherein the third message comprises a request to resume a previous connection between the relay WTRU the network; and

sending the first message to the network using a radio link control (RLC) channel between the relay WTRU and the network based on a mapping between the Uu bearer and the RLC channel after the new connection is established or the previous connection is resumed between the relay WTRU and the network.