Method and apparatus for supporting security in RRC inactive state in wireless communication system

    公开(公告)号:US11553550B2

    公开(公告)日:2023-01-10

    申请号:US16502493

    申请日:2019-07-03

    IPC分类号: H04W12/00 H04W76/27 H04W12/30

    摘要: A method and apparatus for supporting security in a radio resource control (RRC) inactive state in a wireless communication system is provided. A user equipment (UE) receives information on multiple security variables, of which each variable is mapped to each of multiple counter values, respectively. The UE calculates a security parameter and/or updating a UE identifier (ID) based on a security variable among the security variables which is mapped to a corresponding counter value among the multiple counter values, and transmits a radio resource control (RRC) resume request message including the calculated security parameter and/or the updated UE ID. The counter value may be increase whenever a timer expires or an RRC reject message is received as a response to the RRC resume request message.

    Method for managing UE context and device supporting the same

    公开(公告)号:US11432209B2

    公开(公告)日:2022-08-30

    申请号:US16763545

    申请日:2018-11-13

    摘要: Provided are a method of managing UE context and a device supporting the method. According to one embodiment of the present invention, a method for managing UE context in a wireless communication system includes: receiving a UE context request message including a radio resource control (RRC) establishment cause from a second BS, wherein the first BS and the second BS are located in a same radio access network (RAN)-based notification area (RNA); and when the RRC establishment cause is related to RNA update, transmitting a UE context response message to the second BS, wherein the UE context response message piggybacks a RRC message requesting a UE to move to a RRC inactive state.

    Method and device for determining RRC state

    公开(公告)号:US11129228B2

    公开(公告)日:2021-09-21

    申请号:US16483373

    申请日:2018-02-02

    摘要: Provided are a method by which an access stratum (AS) layer of a terminal determines a radio resource control (RRC) state in a wireless communication system, and a device for supporting the same. The method can comprise the steps of: entering an RRC_INACTIVE state; receiving, from a core network (CN), CN paging in the RRC_INACTIVE state; forwarding a UE ID of the terminal and a CN domain to a non-access stratum (NAS) layer of the terminal; receiving an RRC connection release request from the NAS layer of the terminal; and entering an RRC_IDLE state on the basis of the received RRC connection release request.

    Method and apparatus for activating security and changing PDCP version

    公开(公告)号:US11564098B2

    公开(公告)日:2023-01-24

    申请号:US16638661

    申请日:2018-10-11

    摘要: Provided is a method for changing, by a user equipment (UE), packet data convergence protocol (PDCP) version. The method may include: receiving a security mode command message, which includes a first security algorithm configuration for a PDCP of a first system and a second security algorithm configuration for a PDCP of a second system, from a base station (BS); deriving a first security key for the PDCP of the first system, based on the first security algorithm configuration; when the security mode command message passes an integrity protection check based on the first security key, changing the PDCP version from the PDCP of the first system to the PDCP of the second system; deriving a second security key for the PDCP of the second system, based on the second security algorithm configuration; and transmitting a security mode complete message, based on the second security key, to the BS.

    Method and device for performing access barring check

    公开(公告)号:US10805860B2

    公开(公告)日:2020-10-13

    申请号:US16606208

    申请日:2018-03-19

    IPC分类号: H04W4/00 H04W48/02 H04W76/27

    摘要: Provided are a method by which a terminal performs an access barring check in a wireless communication system and a device for supporting the same. The method may include: a step for entering an RRC_INACTIVE state; a step for performing the access barring check on a cell; a step for checking that access to the cell is prevented as many times as the maximum number of access attempts; and a step for transitioning from the RRC_INACTIVE state to an RRC_IDLE state.