UE to UE crosslink interference measurement and reporting
Some embodiments of this disclosure include apparatuses and methods for measuring and/or reporting UE-to-UE crosslink interference (CLI). In some embodiments, a communication network may use transmission reception points (TRPs) to facilitate communications for user equipment (UE). A first TRP may command a first UE to transmit a crosslink interference reference signal (CLI-RS) according to a particular time behavior. A second TRP may command a second UE to measure UE-to-UE CLI using the CLI-RS and the time behavior. The second UE may then report the measured CLI indicating a level of interference caused by the first UE.
1. A method, comprising:
commanding a first transmission reception point (TRP) to transmit a first Radio Resource Control (RRC) message that commands a first user equipment (UE) to transmit a crosslink interference reference signal (CLI-RS) according to a time behavior specified by the first RRC message, wherein the first RRC message includes spatial relationship information specifying a spatial relationship between the CLI-RS and a downlink target reference signal, and wherein the spatial relationship information indicates a transmit beam to be used for the CLI-RS;
commanding a second TRP to transmit a second RRC message that commands a second UE to measure UE-to-UE crosslink interference (CLI) using the CLI-RS transmitted by the first UE according to the time behavior; and
in response to the second UE measuring the UE-to-UE CLI, receiving from the second UE, a reporting of the measured UE-to-UE CLI indicating a level of interference caused by the first UE.
2. The method of claim 1 , wherein the time behavior indicates a periodicity for transmitting the CLI-RS from the first UE.
3. The method of claim 1 , wherein the first RRC message includes a Medium Access Control Control Element (MAC CE) used to activate a semi-persistent CLI-RS transmission.
4. The method of claim 1 , wherein the first TRP and the second TRP operate as a single network node.
5. The method of claim 1 , wherein the first RRC message commands the first UE to reuse a sounding reference signal (SRS) as the CLI-RS.
6. The method of claim 1 , wherein the first RRC message further commands the first UE to transmit a second CLI-RS and wherein the CLI-RS corresponds to a first transmission beam transmitted by the first UE and the second CLI-RS corresponds to a second transmission beam transmitted by the first UE.
7. The method of claim 6 , wherein the reporting of the measured UE-to-UE CLI includes an average of a first CLI value measured from the CLI-RS corresponding to the first transmission beam and a second CLI value measured from the second CLI-RS corresponding to the second transmission beam.
8. An apparatus, comprising:
radio front end circuitry; and
processing circuitry coupled to the radio front end circuitry, wherein the processing circuitry is configured to:
command a first transmission reception point (TRP) to transmit a first Radio Resource Control (RRC) message that commands a first user equipment (UE) to transmit a crosslink interference reference signal (CLI-RS) according to a time behavior specified by the first RRC message, wherein the first RRC message includes spatial relationship information specifying a spatial relationship between the CLI-RS and a downlink target reference signal, and wherein the spatial relationship information indicates a transmit beam to be used for the CLI-RS;
command a second TRP to transmit a second RRC message that commands a second UE to measure UE-to-UE crosslink interference (CLI) using the CLI-RS transmitted by the first UE according to the time behavior; and
in response to the second UE measuring the UE-to-UE CLI, receive from the second UE, a reporting of the measured UE-to-UE CLI indicating a level of interference caused by the first UE.
9. The apparatus of claim 8 , wherein the time behavior indicates a periodicity for transmitting the CLI-RS from the first UE.
10. The apparatus of claim 8 , wherein the first RRC message includes a Medium Access Control Control Element (MAC CE) used to activate a semi-persistent CLI-RS transmission.
11. The apparatus of claim 8 , wherein the first TRP and the second TRP operate as a single network node.
12. The apparatus of claim 8 , wherein the first RRC message commands the first UE to reuse a sounding reference signal (SRS) as the CLI-RS.
13. The apparatus of claim 8 , wherein the first RRC message further commands the first UE to transmit a second CLI-RS and wherein the CLI-RS corresponds to a first transmission beam transmitted by the first UE and the second CLI-RS corresponds to a second transmission beam transmitted by the first UE.
14. The apparatus of claim 13 , wherein the reporting of the measured UE-to-UE CLI includes an average of a first CLI value measured from the CLI-RS corresponding to the first transmission beam and a second CLI value measured from the second CLI-RS corresponding to the second transmission beam.
15. A first user equipment (UE), comprising:
radio front end circuitry; and
processing circuitry coupled to the radio front end circuitry, wherein the processing circuitry is configured to:
receive, via the radio front end circuitry, a Radio Resource Control (RRC) message from a transmission reception point (TRP) that commands the first UE to measure UE-to-UE crosslink interference (CLI) using a crosslink interference reference signal (CLI-RS) transmitted from a second UE, wherein the RRC message includes spatial relationship information specifying a spatial relationship between the CLI-RS and a downlink target reference signal, and wherein the spatial relationship information indicates a receive beam to be used for measuring the UE-to-UE CLI;
measure the UE-to-UE CLI based on the RRC message; and
report, via the radio front end circuitry, the measured UE-to-UE CLI to the TRP indicating a level of interference caused by the second UE.
16. The UE of claim 15 , wherein the RRC message indicates a periodicity for measuring the CLI-RS from the second UE.
17. The UE of claim 15 , wherein the RRC message includes a Medium Access Control Control Element (MAC CE) used to activate a semi-persistent CLI-RS measurement.
18. The UE of claim 15 , wherein to measure the UE-to-UE CLI, the processing circuitry is further configured to:
measure one or more transmission beams transmitted from the second UE.
19. The UE of claim 18 , wherein a first transmission beam of the one or more transmission beams corresponds to a first CLI-RS transmission set and a second transmission beam of the one or more transmission beams corresponds to a second CLI-RS transmission set.
20. The UE of claim 19 , wherein the reporting of the measured UE-to-UE CLI includes an average of a first CLI value measured from the first CLI-RS transmission set corresponding to the first transmission beam and a second CLI value measured from the second CLI-RS transmission set corresponding to the second transmission beam.