Method and device for performing secondary node change in wireless communication system
A method and a device for performing a secondary node change in a wireless communication system are disclosed. A method by which a multi-access master node (MN) performs a secondary node (SN) change in a wireless communication system may comprise the steps of: receiving, from a source secondary node (S-SN), an SN change request message including conditional cell change information indicating the maximum number of one or more candidate cells that can be serviced by one or more target secondary nodes (T-SN); transmitting, to the one or more target secondary nodes, an SN additional request message on the basis of the conditional cell change information; receiving, from the one or more target secondary nodes, an SN additional request ACK message including radio resource control (RRC) configuration information in response to the SN additional request message; and transmitting an RRC reconfiguration message to a user terminal on the basis of the RRC configuration information.
1 . A method for performing a secondary node (SN) change by a master node (MN) of multi-connectivity in a wireless communication system, the method comprising:
receiving, from a source SN, an SN change required message including conditional cell change information including a maximum number of at least one candidate cell to be configured on at least one target SN;
transmitting, to the at least one target SN, an SN addition request message;
receiving, from the at least one target SN, an SN addition request acknowledge message including a first radio resource control (RRC) message, in response to the SN addition request message;
transmitting, to the source SN, an SN modification request message including candidate cell information indicating at least one candidate cell accepted by the at least one target SN;
receiving, from the source SN, a second RRC message including updated measurement configuration information; and
transmitting, to a user equipment (UE), a third RRC message based on the first RRC message, wherein the third RRC message includes the updated measurement configuration information.
2 . The method of claim 1 , wherein the SN change required message includes conditional reconfiguration information for at least one candidate cell succeeding in candidate admission in the at least one target SN.
3 . The method of claim 1 , wherein the SN addition request message includes identification information for the at least one candidate cell and a conditional cell change trigger condition.
4 . The method of claim 1 , wherein the candidate cell information includes conditional primary secondary cell group (SCG) cell change (CPC) configuration information for the at least one candidate cell.
5 . The method of claim 1 , wherein the updated measurement configuration information includes a remaining measurement configuration except for at least one measurement configuration selected based on a CPC execution condition from among measurement configuration information for the at least one candidate cell.
6 . The method of claim 1 ,
wherein the SN addition request message includes information related to the maximum number of the at least one candidate cell, and
wherein the first RRC message includes at least one secondary cell group configuration for each secondary cell configured on the at least one target SN, and
wherein each secondary cell is configured based on the maximum number of the at least one candidate cell.
7 . The method of claim 1 , wherein the SN addition request message includes the conditional cell change information including the maximum number of the at least one candidate cell to be configured on the at least one target SN.
8 . A master node (MN) performing a secondary node (SN) change of multi-connectivity in a wireless communication system, comprising:
a transceiver; and
a controller, wherein the controller is configured to:
receive, from a source SN, an SN change required message including conditional cell change information including a maximum number of at least one candidate cell to be configured on at least one target SN;
transmit, to the at least one target SN, an SN addition request message;
receive, from the at least one target SN, an SN addition request acknowledge message including a first radio resource control (RRC) message in response to the SN addition request message;
transmit, to the source SN, an SN modification request message including candidate cell information indicating at least one candidate cell accepted by the at least one target SN;
receive, from the source SN, a second RRC message including updated measurement configuration information; and
transmit, to a user equipment (UE), a third RRC message based on the first RRC message, wherein the third RRC message includes the updated measurement configuration information.
9 . The MN of claim 8 , wherein the SN change required message includes conditional reconfiguration information for at least one candidate cell succeeding in candidate admission in the at least one target SN.
10 . The MN of claim 8 , wherein the SN addition request message includes identification information for the at least one candidate cell and a conditional cell change trigger condition.
11 . The MN of claim 8 , wherein the candidate cell information includes conditional primary secondary cell group (SCG) cell change (CPC) configuration information for the at least one candidate cell.
12 . The MN of claim 8 ,
wherein the SN addition request message includes information related to the maximum number of the at least one candidate cell, and
wherein the first RRC message includes at least one secondary cell group configuration for each secondary cell configured on the at least one target SN, and
wherein each secondary cell is configured based on the maximum number of the at least one candidate cell.
13 . The MN of claim 8 , wherein the SN addition request message includes the conditional cell change information including the maximum number of the at least one candidate cell to be configured on the at least one target SN.
14 . The MN of claim 8 , wherein the updated measurement configuration information includes a remaining measurement configuration except for at least one measurement configuration selected based on a CPC execution condition from among measurement configuration information for the at least one candidate cell.