Relay Discovery and Selection

A destination wireless transmit/receive unit (WTRU), the destination WTRU comprising:

• a processor, the processor configured to:
• receive a first message from a relay WTRU, wherein the first message indicates a service provided by a source WTRU, indicates a key performance indicator (KPI) that the relay WTRU supports for the service, and indicates a first measurement associated with a broadcast message sent by the source WTRU and received by the relay WTRU;
• determine a second measurement, wherein the second measurement is associated with the first message received from the relay WTRU;
• determine that a relay selection criterion is satisfied based on the first measurement, the second measurement, and the KPI;
• and
• send a second message to the relay WTRU when the relay selection criterion is satisfied, wherein the second message indicates a request for the service to be provided using a connection between the destination WTRU and the source WTRU via the relay WTRU.

A method performed by a destination wireless transmit/receive unit (WTRU), the method comprising:

• receiving a first message from a relay WTRU, wherein the first message indicates a service provided by a source WTRU, indicates a key performance indicator (KPI) that the relay WTRU supports for the service, and indicates a first measurement associated with a broadcast message sent by the source WTRU and received by the relay WTRU;
• determining a second measurement, wherein the second measurement is associated with the first message received from the relay WTRU;
• determining that a relay selection criterion is satisfied based on the first measurement, the second measurement, and the KPI;
• and
• sending a second message to the relay WTRU when the relay selection criterion is satisfied, wherein the second message indicates a request for the service to be provided using a connection between the destination WTRU and the source WTRU via the relay WTRU.

A destination wireless transmit-receive unit (WTRU), the destination WTRU comprising:

• a processor, the processor configured to:
• receive a first message from a first relay WTRU, wherein the first message indicates a service provided by a source WTRU and a combined measurement associated with a first measurement and a second measurement, wherein the first measurement is determined by the first relay WTRU, and wherein the second measurement is determined by a second relay WTRU;
• determine a third measurement, wherein the third measurement is associated with the first message received from the first relay WTRU;
• and
• send a second message to the first relay WTRU if the third measurement satisfies a first criterion for selecting a relay from a plurality of relays and a sum of the third measurement and the combined measurement satisfies a second criterion for selecting the relay from the plurality of relays, wherein the second message comprises an indication to receive data from the source WTRU via the first relay WTRU.

A method performed by a destination wireless transmit-receive unit (WTRU), the method comprising:

• receiving a first message from a first relay WTRU, wherein the first message indicates a service provided by a source WTRU and a combined measurement associated with a first measurement and a second measurement, wherein the first measurement is determined by the first relay WTRU, and wherein the second measurement is determined by a second relay WTRU;
• determining a third measurement, wherein the third measurement is associated with the first message received from the first relay WTRU;
• and
• sending a second message to the first relay WTRU if the third measurement satisfies a first criterion for selecting a relay from a plurality of relays and a sum of the third measurement and the combined measurement satisfies a second criterion for selecting the relay from the plurality of relays, wherein the second message comprises an indication to receive data from the source WTRU via the first relay WTRU.