Radio access network node, radio terminal, and method therefor
During a mobility procedure for moving a radio terminal ( 3 ) from a source cell ( 11 ) to one of candidate target cells ( 21 - 23 ), a target RAN node ( 2 ) transmits to the radio terminal ( 3 ), via a source RAN node ( 1 ), a first configuration common to the candidate target cells and a plurality of second configurations each associated with a respective one of the candidate target cells. The first configuration includes at least one configuration parameter for enabling the radio terminal ( 3 ) to access to one of the candidate target cells or to communicate therein. Each second configuration includes at least one configuration parameter for enabling the radio terminal ( 3 ) to access to the corresponding candidate target cell or to communicate therein. This contributes to, for example, reducing signaling overhead of an inter-RAN node interface (and an air interface) during various mobility procedures including handovers.
1. A method performed by a user equipment (UE), the method comprising:
receiving from a source radio access network (RAN) node a first message including a plurality of radio resource configurations, each for a respective one of a plurality of conditional handover candidate cells; and
after completion of a conditional handover from the source RAN node to a target RAN node controlling a target cell, which is one of the plurality of conditional handover candidate cells, releasing remaining one or more radio resource configurations for remaining one or more conditional handover candidate cells other than the target cell from the plurality of radio resource configurations.
2. The method according to claim 1 , wherein the first message further includes a conditional handover (CHO) condition, the method further comprising, if the UE receives a normal handover command with no CHO condition after receiving the first message but before the CHO condition is satisfied, executing a handover based on the normal handover command.