Sidelink network assisted inter-UE coordination
Methods and apparatuses for sidelink (SL) network assisted inter-user equipment (UE) coordination in a wireless communication system. A method for operating a UE includes receiving, on a Uu interface, a message associated with SL inter-UE coordination information, determining SL resources for a SL transmission based on the SL inter-UE coordination information, selecting the SL resources for the SL transmission, and transmitting on a SL interface using the SL resources. A method of operating a BS includes receiving, on a Uu interface, a message including first SL inter-UE coordination information from a first UE, determining a second UE as a recipient for the first SL inter-UE coordination information, generating second SL inter-UE coordination information from aggregation of the first SL inter-UE coordination information and other SL inter-UE coordination information, and transmitting the second SL inter-UE coordination information to the second UE.
1. A user equipment (UE), comprising:
a transceiver configured to receive, via a groupcast message, first sidelink (SL) inter-UE coordination information; and
a processor operably coupled to the transceiver, the processor configured to:
determine SL resources for a SL transmission based on the first SL inter-UE coordination information, and
generate a second SL inter-UE coordination information,
wherein the first SL inter-UE coordination information includes information indicating resources that are not preferred,
wherein the SL resources are determined by excluding the resources that are not preferred, and
wherein the transceiver is further configured to:
transmit on a SL interface using the SL resources, and
transmit on a Uu interface, the second SL inter-UE coordination.
2. The UE of claim 1 , wherein:
the transceiver is configured to receive the first SL inter-UE coordination information from a cell with a physical cell identity (PCI) different from a PCI of a serving cell of the UE, and
wherein the reception of the first SL inter-UE coordination information from the cell is based on one of:
a reference signal receive power (RSRP) of a signal from the cell with the different PCI,
a location of the UE, or
a distance between the UE and the cell with the different PCI.
3. The UE of claim 1 , wherein the transceiver is further configured to transmit, to a gNB, a request for the first SL inter-UE coordination information.
4. The UE of claim 3 , wherein the request includes at least one of:
location information of the UE,
motion information of the UE, and
information about another UE for which the first SL inter-UE coordination information is being requested.
5. The UE of claim 1 , wherein:
the transceiver and processor is further configured to perform sensing on the SL interface,
the processor is further configured to generate a second SL inter-UE coordination information based on the sensing, and
the transceiver is further configured to transmit the second SL inter-UE coordination information on a Uu interface.
6. The UE of claim 5 , wherein:
a message received on the Uu interface includes a request for the second SL inter-UE coordination information,
the transceiver and processor is further configured to perform sensing on the SL interface,
the processor is further configured to generate the second SL inter-UE coordination information based on the received request and the sensing, and
the transceiver is further configured to transmit the second SL inter-UE coordination information.
7. A base station (BS), comprising:
a transceiver configured to receive, on a Uu interface, a message including first sidelink (SL) inter-user equipment (UE) coordination information from a first UE, and
a processor operably coupled to the transceiver, the processor configured to:
determine SL resources for a SL transmission based on the first SL inter-UE coordination information,
determine a second UE as a recipient for the first SL inter-UE coordination information, and
generate second SL inter-UE coordination information from aggregation of the first SL inter-UE coordination information and other SL inter-UE coordination information,
wherein the transceiver is further configured to transmit the second SL inter-UE coordination information to the second UE via a groupcast message,
wherein the second SL inter-UE coordination information includes information indicating resources that are not preferred, and
wherein the SL resources are determined by excluding the resources that are not preferred.
8. The BS of claim 7 , wherein:
the processor is further configured to determine third SL inter-UE coordination information for UEs in a neighbor cell, and
the transceiver is further configured to transmit the third SL inter-UE coordination information to a BS of the neighbor cell through a backhaul interface.
9. The BS of claim 7 , wherein:
the transceiver is further configured to receive third SL inter-UE coordination information from another BS through a backhaul interface, and
the processor is further configured to aggregate the third SL inter-UE coordination information into the second SL inter-UE coordination information.
10. The BS of claim 7 , wherein the transceiver is configured to receive, on the Uu interface, a request for the second SL inter-UE coordination information from the second UE.
11. The BS of claim 7 , wherein the transceiver is configured to transmit, on the Uu interface, a request for the first SL inter-UE coordination information to the first UE.
12. The BS of claim 7 , wherein:
the processor and the transceiver are configured to perform sensing on a SL interface,
the processor is further configured to determine third SL inter-UE coordination information based on the sensing, and
the processor is further configured to aggregate the third SL inter-UE coordination information into the second SL inter-UE coordination information.
13. A method of operating a base station (BS), the method comprising:
receiving, on a Uu interface, a message including first sidelink (SL) inter-user equipment (UE) coordination information from a first UE,
determining SL resources for a SL transmission based on the first SL inter-UE coordination information,
determining a second UE as a recipient for the first SL inter-UE coordination information, and
generating second SL inter-UE coordination information from aggregation of the first SL inter-UE coordination information and other SL inter-UE coordination information, and
transmitting the second SL inter-UE coordination information to the second UE via a groupcast message,
wherein the second SL inter-UE coordination information includes information indicating resources that are not preferred, and
wherein the SL resources are determined by excluding the resources that are not preferred.
14. The method of claim 13 , further comprising:
determining third SL inter-UE coordination information for UEs in a neighbor cell, and
transmitting the third SL inter-UE coordination information to a BS of the neighbor cell through a backhaul interface.
15. The method of claim 13 , further comprising:
receiving a third SL inter-UE coordination information from another BS through a backhaul interface, and
aggregating the third SL inter-UE coordination information into the second SL inter-UE coordination information.
16. The method of claim 13 , further comprising receiving, on the Uu interface, a request for the second SL inter-UE coordination information from the second UE.
17. The method of claim 13 , further comprising transmitting, on the Uu interface, a request for the first SL inter-UE coordination information to the first UE.
18. The method of claim 13 , further comprising:
performing sensing on a SL interface;
determining third SL inter-UE coordination information based on the sensing; and
aggregating the third SL inter-UE coordination information into the second SL inter-UE coordination information.