A method performed by a terminal (1f-01) in a wireless communication system, the method comprising: receiving (1f-10), from a base station (1f-02), a radio resource control, RRC, message for suspending an RRC connection between the terminal (1f-01) and the base station (1f-02); identifying whether the terminal (1f-01) is configured to perform both a new radio, NR, vehicle to everything, V2X, sidelink communication on a first frequency and a long term evolution, LTE, V2X sidelink communication on a second frequency during the terminal (1f-01) being in an RRC inactive state; in case that the terminal (1f-01) is configured to perform both the NR V2X sidelink communication and the LTE V2X sidelink communication, identifying whether a third frequency for a cell reselection exists, the third frequency providing both an NR V2X sidelink communication configuration and an LTE V2X sidelink communication configuration; determining the third frequency to be a highest priority for the cell reselection, in case that the third frequency exists, wherein the third frequency is for NR or LTE; determining a fourth frequency to be the highest priority for the cell reselection, in case that the third frequency does not exist, the fourth frequency providing either the NR V2X sidelink communication configuration or the LTE V2X sidelink communication configuration, wherein the fourth frequency is for the NR or the LTE; and in case that the terminal (1f-01) is configured to perform the NR V2X sidelink communication or the LTE V2X sidelink communication, determining a frequency providing an intra-carrier configuration and a frequency providing an inter-carrier configuration to be the highest priority as the same priority for the cell reselection. receiving (1f-10), from a base station (1f-02), a radio resource control, RRC, message for suspending an RRC connection between the terminal (1f-01) and the base station (1f-02); identifying whether the terminal (1f-01) is configured to perform both a new radio, NR, vehicle to everything, V2X, sidelink communication on a first frequency and a long term evolution, LTE, V2X sidelink communication on a second frequency during the terminal (1f-01) being in an RRC inactive state; in case that the terminal (1f-01) is configured to perform both the NR V2X sidelink communication and the LTE V2X sidelink communication, identifying whether a third frequency for a cell reselection exists, the third frequency providing both an NR V2X sidelink communication configuration and an LTE V2X sidelink communication configuration; determining the third frequency to be a highest priority for the cell reselection, in case that the third frequency exists, wherein the third frequency is for NR or LTE; determining a fourth frequency to be the highest priority for the cell reselection, in case that the third frequency does not exist, the fourth frequency providing either the NR V2X sidelink communication configuration or the LTE V2X sidelink communication configuration, wherein the fourth frequency is for the NR or the LTE; and identifying whether a third frequency for a cell reselection exists, the third frequency providing both an NR V2X sidelink communication configuration and an LTE V2X sidelink communication configuration; determining the third frequency to be a highest priority for the cell reselection, in case that the third frequency exists, wherein the third frequency is for NR or LTE; determining a fourth frequency to be the highest priority for the cell reselection, in case that the third frequency does not exist, the fourth frequency providing either the NR V2X sidelink communication configuration or the LTE V2X sidelink communication configuration, wherein the fourth frequency is for the NR or the LTE; and in case that the terminal (1f-01) is configured to perform the NR V2X sidelink communication or the LTE V2X sidelink communication, determining a frequency providing an intra-carrier configuration and a frequency providing an inter-carrier configuration to be the highest priority as the same priority for the cell reselection.