Method of updating location of user equipment and related device
A method performed by a user equipment (UE) for updating a location of the UE in a radio resource control (RRC) inactive state is provided. The method includes determining whether a small data transmission (SDT) procedure is ongoing in a case that an event for triggering a location update procedure occurs; and initiating the location update procedure in a case that the SDT procedure is not ongoing.
1. A method performed by a user equipment (UE) for updating a location of the UE that is in a radio resource control (RRC) inactive state, the method comprising:
determining whether a small data transmission (SDT) procedure is ongoing in a case that an event for triggering a location update procedure occurs; and
initiating the location update procedure in a case that the SDT procedure is not ongoing.
2. The method of claim 1 , further comprising:
refraining from initiating the location update procedure in a case that the SDT procedure is ongoing.
3. The method of claim 1 , wherein:
the location update procedure comprises a radio access network (RAN) notification area update (RNAU) procedure, and
the event indicates that (i) an RNAU timer has expired, or (ii) the UE has moved out of a stored RAN notification area (RNA).
4. The method of claim 3 , further comprising:
starting the RNAU timer upon reception of a first value configured for the RNAU timer in a first radio resource control (RRC) release message that instructs the UE to transition to the RRC inactive state; and
keeping the RNAU timer running during the ongoing SDT procedure.
5. The method of claim 4 , further comprising:
receiving a second RRC release message as a response of the ongoing SDT procedure;
re-starting the RNAU timer with a second value configured for the RNAU timer in a case that the second RRC release message includes the second value; and
stopping the RNAU timer in a case that the second RRC release message does not include the second value.
6. The method of claim 3 , further comprising:
setting a parameter, that indicates whether the RNAU procedure is pending, to ‘true’ in a case that both of the following conditions are fulfilled:
the RNAU timer has expired; and
the UE receives an RRC reject message as a response of the ongoing SDT procedure.
7. The method of claim 3 , further comprising:
setting a parameter, that indicates whether the RNAU procedure is pending, to ‘false’ in a case that the UE initiates the SDT procedure.
8. The method of claim 1 , wherein:
the SDT procedure comprises one of an RRC-based SDT procedure or an RRC-less SDT procedure, the RRC-based SDT procedure comprising transmitting a first packet that is embedded in an RRC resume request message, and the RRC-less SDT procedure comprising transmitting a second packet that is not embedded in the RRC resume request message.
9. The method of claim 1 , wherein:
the location update procedure comprises a tracking area update (TAU) procedure in a case that the UE is configured to transition to the RRC Inactive state or an RRC Idle state.
10. The method of claim 1 , wherein:
the SDT procedure comprises one of a random access (RA) SDT procedure or a configured grant (CG) SDT procedure, and
the SDT procedure is implemented on Evolved Universal Terrestrial Radio Access (E-UTRA) protocols or New Radio (NR) protocols.
11. A user equipment (UE) for updating a location of the UE that is in a radio resource control (RRC) inactive state, comprising:
one or more processors; and
at least one non-transitory machine-readable medium coupled to at least one of the one or more processors and storing computer-executable instructions that, when executed by the at least one of the one or more processors, cause the UE to:
determine whether a small data transmission (SDT) procedure is ongoing in a case that an event for triggering a location update procedure occurs; and
initiate the location update procedure in a case that the SDT procedure is not ongoing.
12. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one of the one or more processors, further cause the UE to:
refrain from initiating the location update procedure in a case that the SDT procedure is ongoing.
13. The UE of claim 11 , wherein:
the location update procedure comprises a radio access network (RAN) notification area update (RNAU) procedure, and
the event indicates that (i) an RNAU timer has expired, or (ii) the UE has moved out of a stored RAN notification area (RNA).
14. The UE of claim 13 , wherein the computer-executable instructions, when executed by the at least one of the one or more processors, further cause the UE to:
start the RNAU timer upon reception of a first value configured for the RNAU timer in a first radio resource control (RRC) release message that instructs the UE to transition to the RRC inactive state; and
keep the RNAU timer running during the ongoing SDT procedure.
15. The UE of claim 14 , wherein the computer-executable instructions, when executed by the at least one of the one or more processors, further cause the UE to:
receive a second RRC release message as a response of the ongoing SDT procedure;
re-start the RNAU timer with a second value configured for the RNAU timer in a case that the second RRC release message includes the second value; and
stop the RNAU timer in a case that the second RRC release message does not include the second value.
16. The UE of claim 13 , wherein the computer-executable instructions, when executed by the at least one of the one or more processors, further cause the UE to:
set a parameter, that indicates whether the RNAU procedure is pending, to ‘true’ in a case that both of the following conditions are fulfilled:
the RNAU timer has expired; and
the UE receives an RRC reject message as a response of the ongoing SDT procedure.
17. The UE of claim 13 , wherein the computer-executable instructions, when executed by the at least one of the one or more processors, further cause the UE to:
set a parameter, that indicates whether the RNAU procedure is pending, to ‘false’ in a case that the UE initiates the SDT procedure.
18. The UE of claim 11 , wherein:
the SDT procedure comprises one of an RRC-based SDT procedure or an RRC-less SDT procedure, the RRC-based SDT procedure comprising transmitting a first packet that is embedded in an RRC resume request message, and the RRC-less SDT procedure comprising transmitting a second packet that is not embedded in the RRC resume request message.
19. The UE of claim 11 , wherein:
the location update procedure comprises a tracking area update (TAU) procedure in a case that the UE is configured to transition to the RRC Inactive state or an RRC Idle state.
20. The UE of claim 11 , wherein:
the SDT procedure comprises one of a random access (RA) SDT procedure or a configured grant (CG) SDT procedure, and
the SDT procedure is implemented on Evolved Universal Terrestrial Radio Access (E-UTRA) protocols or New Radio (NR) protocols.