Method and apparatus for managing PSCell mobility history information in next-generation mobile communication system
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes entering a radio resource control (RRC) connected mode with a first primary cell (PCell), performing secondary node addition procedure with a primary secondary cell (PSCell), and storing visited information associated with the first PCell and the PSCell in case that the first PCell is changed to a second PCell and the PSCell is released at the same time as the change of the first PCell to the second PCell.
1 . A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
entering a radio resource control (RRC) connected mode with a first primary cell (PCell);
performing a secondary node addition procedure with a primary secondary cell (PSCell);
identifying whether the UE supports PSCell mobility history information (MHI) and the PSCell is released at a same time as a change of the first PCell to a second PCell;
in case that the UE supports the PSCell MHI and the PSCell is released at the same time as the change of the first PCell to the second PCell, storing visited information associated with the PSCell; and
transmitting, to the second PCell, a response message including the stored visited information associated with the PSCell.
2 . The method of claim 1 , wherein the visited information includes at least one of an identity of the PSCell or time spent in the PSCell while being connected to the first PCell.
3 . The method of claim 2 , wherein the identity of the PSCell is a global cell identity, in case that the global cell identity is available.
4 . The method of claim 2 , wherein the identity of the PSCell is a physical cell identity and the visited information further includes carrier frequency of a physical cell, in case that a global cell identity is not available.
5 . The method of claim 1 , further comprising:
transmitting, to the first PCell, UE capability information including a PSCell MHI indicator.
6 . The method of claim 1 ,
wherein the visited information associated with the PSCell is stored in a visitedPSCellInfoList, and
wherein oldest visited information is removed from the visitedPSCellInfoList prior to storing the visited information associated with the PSCell.
7 . A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
at least one processor configured to:
enter a radio resource control (RRC) connected mode with a first primary cell (PCell),
perform a secondary node addition procedure with a primary secondary cell (PSCell),
identify whether the UE supports PSCell mobility history information (MHI) and the PSCell is released at a same time as a change of the first PCell to a second PCell,
in case that the UE supports the PSCell MHI and the PSCell is released at the same time as the change of the first PCell to the second PCell, store visited information associated with the PSCell, and
transmit, to the second PCell, a response message including the stored visited information associated with the PSCell.
8 . The UE of claim 7 , wherein the visited information includes at least one of an identity of the PSCell or time spent in the PSCell while being connected to the first PCell.
9 . The UE of claim 8 , wherein the identity of the PSCell is a global cell identity, in case that the global cell identity is available.
10 . The UE of claim 8 , wherein the identity of the PSCell is a physical cell identity and the visited information further includes carrier frequency of a physical cell, in case that a global cell identity is not available.
11 . The UE of claim 7 , wherein the at least one processor is further configured to:
transmit, to the first PCell, UE capability information including a PSCell MHI indicator.