Method and apparatus for radio resource management in wireless communication system
The present disclosure relates to a radio resource management (RRM) in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device in a wireless communication system comprises: receiving a measurement configuration from a source cell; initiating a dual active protocol stack (DAPS) mobility from the source cell to a target cell; detecting a failure of the DAPS mobility; after detecting the failure of the DAPS mobility: transmitting information for the failure of the DAPS mobility to the source cell; and performing a radio resource management (RRM) measurement on one or more neighbor cells based on the measurement configuration received from the source cell.
1. A method performed by a wireless device in a wireless communication system, the method comprising:
receiving, from a source cell, a measurement configuration;
receiving a handover command for a dual active protocol stack (DAPS) handover to a target cell;
triggering the DAPS handover to the target cell based on the handover command, while maintaining configurations of the source cell until release of the source cell;
detecting a failure of the DAPS handover to the target cell; and
after detecting the failure of the DAPS handover:
obtaining measurement results for one or more neighbor cells based on the measurement configuration received from the source cell, and
transmitting, to the source cell, a measurement report comprising the measurement results for the one or more neighbor cells based on a condition for transferring the measurement results being satisfied.
2. The method of claim 1 , wherein the receiving of the measurement configuration comprises receiving the measurement configuration from the source cell before triggering the DAPS handover to the target cell.
3. The method of claim 1 , wherein the obtaining of the measurement results comprises obtaining the measurement results without performing a radio resource control (RRC) re-establishment.
4. The method of claim 1 , wherein the obtaining of the measurement results comprises:
reverting back to the source cell; and
performing a radio resource management (RRM) measurement in a state the wireless device reverts back to the source cell.
5. The method of claim 1 ,
wherein the measurement configuration is received by the wireless device before the handover command is received by the wireless device.
6. The method of claim 1 , further comprising:
performing at least one of a downlink data reception or an uplink data transmission on the source cell after detecting the failure of the DAPS handover.
7. The method of claim 1 , further comprising:
receiving, from the source cell, a handover command for a neighbor cell;
performing a handover to the neighbor cell as the target cell; and
transmitting a handover complete message based on the handover to the neighbor cell being successful.
8. The method of claim 7 , further comprising:
performing a radio link monitoring (RLM) on the source cell until transmitting the handover complete message.
9. The method of claim 7 , further comprising:
performing a radio link monitoring (RLM) on the target cell from a time the handover complete message is transmitted.
10. The method of claim 7 , further comprising:
after the handover to the neighbor cell is successful, performing a radio resource management (RRM) measurement based on a measurement configuration received from the neighbor cell.
11. The method of claim 1 , wherein the wireless device is in communication with at least one of a user equipment, a network, or autonomous vehicles other than the wireless device.
12. A wireless device configured to operate in a wireless communication system comprising:
a transceiver;
a memory storing instructions; and
at least one processor operatively coupled to the transceiver and the memory, and configured to execute the instructions to perform operations comprising:
receiving, from a source cell, a measurement configuration;
receiving a handover command for a dual active protocol stack (DAPS) handover to a target cell;
triggering the DAPS handover to the target cell based on the handover command, while maintaining configurations of the source cell until release of the source cell;
detecting a failure of the DAPS, handover to the target cell; and
after detecting the failure of the DAPS handover:
obtaining measurement results for one or more neighbor cells based on the measurement configuration received from the source cell, and
transmitting, to the source cell, a measurement report comprising the measurement results for the one or more neighbor cells based on a condition for transferring the measurement results being satisfied.
13. A processor for a wireless device in a wireless communication system, wherein the processor is configured to control the wireless device to perform operations comprising:
receiving, from a source cell, a measurement configuration;
receiving a handover command for a dual active protocol stack (DAPS) handover to a target cell;
triggering the DAPS handover to the target cell based on the handover command, while maintaining configurations of the source cell until release of the source cell;
detecting a failure of the DAPS handover to the target cell; and
after detecting the failure of the DAPS mobility handover:
obtaining measurement results for one or more neighbor cells based on the measurement configuration received from the source cell, and
transmitting, to the source cell, a measurement report comprising the measurement results for the one or more neighbor cells based on a condition for transferring the measurement results being satisfied.