User equipment and method for sidelink failure management
A user equipment (UE) and a method for sidelink failure management are provided. The method includes receiving, from a source cell, a first message including a sidelink Radio Resource Control (RRC) configuration associated with a target cell; determining that a sidelink failure event associated with an associated sidelink destination UE occurs; and transmitting a sidelink failure report indicating the sidelink failure event to the target cell after performing a handover procedure to switch from the source cell to the target cell.
1. A user equipment (UE) for sidelink failure management, comprising:
a processor; and
a memory coupled to the processor, wherein the memory stores a computer-executable program that when executed by the processor, causes the processor to:
receive, from a source cell, a first message including a sidelink Radio Resource Control (RRC) configuration associated with a target cell;
determine that a sidelink failure event associated with a paired sidelink destination UE has occurred; and
transmit, to the target cell, a sidelink failure report indicating the sidelink failure event after performing a handover procedure to switch from the source cell to the target cell.
2. The UE of claim 1 , wherein the sidelink failure event is a sidelink RRC reconfiguration failure event for a PC5 RRC connection between the UE and the paired sidelink destination UE.
3. The UE of claim 1 , wherein the sidelink failure event is a sidelink radio link failure event for a PC5 RRC connection between the UE and the paired sidelink destination UE.
4. The UE of claim 1 , wherein:
the handover procedure is an intra-Radio Access Technology (RAT) handover procedure, and
both the source cell and the target cell belong to either an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) or a New Radio-Radio Access Network (NR-RAN).
5. The UE of claim 1 , wherein:
the handover procedure is an inter-Radio Access Technology (RAT) handover procedure,
one of the source cell and the target cell belongs to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and
the other of the source cell and the target cell belongs to a New Radio-Radio Access Network (NR-RAN).
6. The UE of claim 1 , wherein the sidelink failure report includes a failure cause indicating one of ‘sidelink RRC reconfiguration failure’ and ‘sidelink radio link failure’ and an identifier (ID) of the paired sidelink destination UE.
7. The UE of claim 1 , wherein the computer-executable program, when executed by the processor, further causes the processor to:
receive a full configuration indicator in the first message; and
determine to release a dedicated sidelink radio configuration associated with the paired sidelink destination UE in a case that the dedicated sidelink radio configuration is configured by a serving radio access network (RAN) through UE-specific dedicated control signaling before the reception of the first message.
8. The UE of claim 7 , wherein the computer-executable program, when executed by the processor, further causes the processor to:
determine not to release the dedicated sidelink radio configuration associated with the paired sidelink destination UE in a case that the dedicated sidelink radio configuration is not configured by the serving RAN through the UE-specific dedicated control signaling before the reception of the first message.
9. The UE of claim 7 , wherein the dedicated sidelink radio configuration includes a sidelink radio configuration for the UE to implement at least one of a New Radio (NR) sidelink communication service and a Long-Term Evolution (LTE) Vehicle-to-Everything (V2X) sidelink communication service.
10. The UE of claim 1 , wherein:
the sidelink failure report is transmitted via New Radio (NR) RRC signaling to the target cell in a case that the target cell is an NR cell, and
the sidelink failure report is transmitted via Evolved Universal Terrestrial Radio Access (E-UTRA) RRC signaling in a case that the target cell is an E-UTRA cell.
11. A method performed by a user equipment (UE) for sidelink failure management, the method comprising:
receiving, from a source cell, a first message including a sidelink Radio Resource Control (RRC) configuration associated with a target cell;
determining that a sidelink failure event associated with a paired sidelink destination UE has occurred; and
transmitting, to the target cell, a sidelink failure report indicating the sidelink failure event after performing a handover procedure to switch from the source cell to the target cell.
12. The method of claim 11 , wherein the sidelink failure event is a sidelink RRC reconfiguration failure event for a PC5 RRC connection between the UE and the paired sidelink destination UE.
13. The method of claim 11 , wherein the sidelink failure event is a sidelink radio link failure event for a PC5 RRC connection between the UE and the paired sidelink destination UE.
14. The method of claim 11 , wherein:
the handover procedure is an intra-Radio Access Technology (RAT) handover procedure, and
both the source cell and the target cell belong to either an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) or a New Radio-Radio Access Network (NR-RAN).
15. The method of claim 11 , wherein:
the handover procedure is an inter-Radio Access Technology (RAT) handover procedure,
one of the source cell and the target cell belongs to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and
the other of the source cell and the target cell belongs to a New Radio-Radio Access Network (NR-RAN).
16. The method of claim 11 , wherein the sidelink failure report includes a failure cause indicating one of ‘sidelink RRC reconfiguration failure’ and ‘sidelink radio link failure’ and an identifier (ID) of the paired sidelink destination UE.
17. The method of claim 11 , further comprising:
receiving a full configuration indicator in the first message; and
determining to release a dedicated sidelink radio configuration associated with the paired sidelink destination UE in a case that the dedicated sidelink radio configuration is configured by a serving radio access network (RAN) through UE-specific dedicated control signaling before the reception of the first message.
18. The method of claim 17 , further comprising:
determining not to release the dedicated sidelink radio configuration associated with the paired sidelink destination UE in a case that the dedicated sidelink radio configuration is not configured by the serving RAN through UE-specific dedicated control signaling before the reception of the first message.
19. The method of claim 17 , wherein the dedicated sidelink radio configuration includes a sidelink radio configuration for the UE to implement at least one of a New Radio (NR) sidelink communication service and a Long-Term Evolution (LTE) Vehicle-to-Everything (V2X) sidelink communication service.
20. The method of claim 11 , wherein:
the sidelink failure report is transmitted via New Radio (NR) RRC signaling to the target cell in a case that the target cell is an NR cell, and
the sidelink failure report is transmitted via Evolved Universal Terrestrial Radio Access (E-UTRA) RRC signaling in a case that the target cell is an E-UTRA cell.