Methods and apparatus for privacy handling in prose layer-2 ue-to-network relay operations

A relay Wireless Transmit Receive Unit (WTRU) configured to communicate with a network and a remote WTRU via respective air interfaces, the WTRU further configured to:

• receive a link identifier update (LIU) request message from the remote WTRU having first information, the first information comprising a new remote WTRU layer 2 identifier (L2 ID) and a new most significant byte (MSB) of a new security identifier (ID);
• generate second information responsive to the LIU request message, the second information comprising a new relay WTRU L2 ID and a new least significant byte (LSB) of the new security ID;
• transmit, to the network, a request for a new remote WTRU ID, the request for a new remote WTRU ID comprising a current remote WTRU ID;
• receive the new remote WTRU ID from the network, the new remote WTRU ID associated with the first information and the second information;
• transmit the new remote WTRU ID to the remote WTRU;
• transmit a LIU response message to the remote WTRU, the LIU response message comprising the second information;
• receive, from the remote WTRU, an acknowledgement (ACK) message indicating an acknowledgement of the LIU response message;
• and
• transmit a message to the network responsive to the ACK message, wherein the message indicates to start using the new Remote WTRU ID.

A method performed by a relay Wireless Transmit Receive Unit (WTRU) configured to communicate with a network and a remote WTRU via respective air interfaces, the method comprising:

• receiving a link identifier update (LIU) request message from the remote WTRU having first information, the first information comprising a new remote WTRU layer 2 identifier (L2 ID) and a new most significant byte (MSB) of a new security identifier (ID);
• generating second information responsive to the LIU request message, the second information comprising a new relay WTRU L2 ID and a new least significant byte (LSB) of the new security ID;
• transmitting, to the network, a request for a new remote WTRU ID, the request for a new remote WTRU ID comprising a current remote WTRU ID;
• receiving the new remote WTRU ID from the network, the new remote WTRU ID associated with the first information and the second information;
• transmitting the new remote WTRU ID to the remote WTRU;
• transmitting a LIU response message to the remote WTRU, the LIU response message comprising the second information;
• receiving, from the remote WTRU, an acknowledgement (ACK) message indicating an acknowledgement of the LIU response message;
• and
• transmitting a message to the network responsive to the ACK message, wherein the message indicates to start using the new Remote WTRU ID.

A non-transient computer-readable storage medium comprising instructions which, when executed by a processor, perform a method comprising:

• receiving a link identifier update (LIU) request message from a remote WTRU having first information, the first information comprising a new remote WTRU layer 2 identifier (L2 ID) and a new most significant byte (MSB) of a new security identifier (ID);
• generating second information responsive to the LIU request message, the second information comprising a new relay WTRU L2 ID and a new least significant byte (LSB) of the new security ID;
• transmitting, to a network, a request for a new remote WTRU ID, the request for a new remote WTRU ID comprising a current remote WTRU ID;
• receiving the new remote WTRU ID from the network, the new remote WTRU ID associated with the first information and the second information;
• transmitting the new remote WTRU ID to the remote WTRU;
• transmitting a LIU response message to the remote WTRU, the LIU response message comprising the second information;
• receiving, from the remote WTRU, an acknowledgement (ACK) message indicating an acknowledgement of the LIU response message;
• and
• transmitting a message to the network responsive to the ACK message, wherein the message indicates to start using the new Remote WTRU ID.