Sidelink discovery associated with NR relays
Systems, methods, and instrumentalities are described herein for sidelink discovery, for example, associated with relays, e.g., NR relays. Discovery data may be transmitted, for example, to initialize communication between devices. Discovery data may be transmitted alone or multiplexed with other data (e.g., sidelink data). Discovery data with a high priority may be transmitted alone. Discovery data with a low priority may be multiplexed with other data (e.g., other data received within a duration of time). Discovery data may be multiplexed with other data that share the same destination identity. Resource allocation may be performed, for example, based on whether the discovery data is transmitted alone or multiplexed with other data.
1 . A relay wireless transmit/receive unit (WTRU) comprising:
a memory; and
a processor connected to the memory, wherein the processor is configured to:
receive configuration information that indicates a reference signal received power (RSRP) threshold;
receive a plurality of discovery transmissions, wherein each discovery transmission from the plurality of discovery transmissions is received from a respective WTRU from a plurality of WTRUs, and wherein each discovery transmission from the plurality of discovery transmissions includes a respective WTRU identifier;
determine that at least one sidelink (SL) RSRP value measured from the plurality of discovery transmissions is greater than the RSRP threshold, wherein the at least one SL RSRP value that is greater than the RSRP threshold is associated with at least one WTRU of the plurality of WTRUs;
determine a discovery message content, wherein based on the determination that the at least one SL RSRP value measured from the plurality of discovery transmissions is greater than the RSRP threshold, the discovery message content includes at least one WTRU identifier associated with the at least one WTRU, and wherein the at least one WTRU identifier comprises the respective WTRU identifier for each of the at least one WTRU of the plurality of WTRUs; and
send a discovery message comprising the discovery message content.
2 . The relay WTRU of claim 1 , wherein the at least one SL RSRP value includes a first SL RSRP value and a second RSRP value, wherein the at least one WTRU of the plurality of WTRUs includes a first WTRU and a second WTRU, and wherein the at least one WTRU identifier includes a first WTRU identifier associated with the first WTRU and includes a second WTRU identifier associated with the second WTRU.
3 . The relay WTRU of claim 1 , wherein the RSRP threshold is associated with sidelink discovery.
4 . The relay WTRU of claim 1 , wherein the at least one WTRU of the plurality of WTRUs is a source WTRU.
5 . The relay WTRU of claim 1 , wherein the at least one WTRU of the plurality of WTRUs is a target WTRU.
6 . The relay WTRU of claim 1 , wherein the processor is further configured to:
determine that an SL RSRP value associated with a transmission of the plurality of discovery transmissions is not greater than the RSRP threshold, wherein, based on the determination that the SL RSRP value associated with the transmission of the plurality of discovery transmissions is not greater than the RSRP threshold, the discovery message content does not include a WTRU identifier for a WTRU associated with the transmission.
7 . A method comprising:
receiving configuration information that indicates a reference signal received power (RSRP) threshold;
receiving a plurality of discovery transmissions, wherein each discovery transmission from the plurality of discovery transmissions is received from a respective WTRU from a plurality of WTRUs, and wherein each discovery transmission from the plurality of discovery transmissions includes a respective WTRU identifier;
determining that at least one sidelink (SL) RSRP value measured from the plurality of discovery transmissions is greater than the RSRP threshold, wherein the at least one SL RSRP value that is greater than the RSRP threshold is associated with at least one WTRU of the plurality of WTRUs;
determining a discovery message content, wherein based on the determination that the at least one SL RSRP value measured from the plurality of discovery transmissions is greater than the RSRP threshold, the discovery message content includes at least one WTRU identifier associated with the at least one WTRU, and wherein the at least one WTRU identifier comprises the respective WTRU identifier for each of the at least one WTRU of the plurality of WTRUs; and
sending a discovery message comprising the discovery message content.
8 . The method of claim 7 , wherein the at least one SL RSRP value includes a first SL RSRP value and a second RSRP value, wherein the at least one WTRU of the plurality of WTRUs includes a first WTRU and a second WTRU, and wherein the at least one WTRU identifier includes a first WTRU identifier associated with the first WTRU and includes a second WTRU identifier associated with the second WTRU.
9 . The method of claim 7 , wherein the RSRP threshold is associated with sidelink discovery.
10 . The method of claim 7 , wherein the at least one WTRU of the plurality of WTRUs is a source WTRU.
11 . The method of claim 7 , wherein the at least one WTRU of the plurality of WTRUs is a target WTRU.
12 . The method of claim 7 , wherein the method further comprises:
determining that an SL RSRP value associated with a transmission of the plurality of discovery transmissions is not greater than the RSRP threshold, wherein, based on the determination that the SL RSRP value associated with the transmission of the plurality of discovery transmissions is not greater than the RSRP threshold, the discovery message content does not include a WTRU identifier for a WTRU associated with the transmission.