METHOD WHEREBY TERMINAL SELECTS PLMN IN WIRELESS COMMUNICATION SYSTEM, AND DEVICE FOR SAME

    公开(公告)号:US20200008140A1

    公开(公告)日:2020-01-02

    申请号:US16570650

    申请日:2019-09-13

    Abstract: A method for a User Equipment (UE) in a wireless communication system, the includes transmitting, by the UE which is outside of coverage, a first message for registration to a first cell on a selected first Public Land Mobile Network (PLMN), wherein the first PLMN which is not included in a list related to forbidden PLMNs; receiving, by the UE, a second message related to registration failure with the first PLMN; selecting, by the UE, a second PLMN; and transmitting, by the UE, a third message for registration to a second cell on the selected second PLMN, wherein zero or more PLMNs, which are included in the list related to forbidden PLMNs, are excluded in a selection of the second PLMN, and wherein the first PLMN with which the registration has failed is further excluded in the selection of the second PLMN, although the first PLMN is not included in the list related to forbidden PLMNs.

    METHOD FOR TRACKING AREA UPDATE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

    公开(公告)号:US20190116483A1

    公开(公告)日:2019-04-18

    申请号:US16087487

    申请日:2017-03-23

    Abstract: Disclosed herein are a method for tracking area update in a wireless communication system and an apparatus therefor. Specifically, a method for user equipment (UE) to perform a tracking area update (TAU) procedure in a wireless communication system comprises: a step of transmitting a TAU request message to a mobility management entity (MME); and a step of receiving a TAU accept message from the MME, wherein if the UE uses signaling optimization to enable the delivery of user data through a control plane over the MME, and the UE does not have pending user data to be transmitted through a user plane and has pending user data to be transmitted through the control plane over the MME, then a first active flag can be set in the TAU request message.

    METHOD FOR REGISTERING HOME ROUTED ROAMING USER EQUIPMENT WITH IMS NETWORK

    公开(公告)号:US20190028992A1

    公开(公告)日:2019-01-24

    申请号:US15755725

    申请日:2016-08-17

    Abstract: One disclosure of the present specification provides a method for a proxy-call session control function (P-CSCF) of a home public land mobile network (H-PLMN) to register a roaming user equipment with an IP multimedia subsystem (IMS) network. The method may comprise the steps of: receiving an identifier of a visited public land mobile network (V-PLMN) in which a user equipment is roaming, wherein the identifier of the V-PLMN is received in a state where packet data network (PDN) connection for the user equipment is established but the user equipment is not registered with the IMS network; receiving, from the user equipment, a REGISTER message for registration with the IMS network; adding the identifier of the V-PLMN to a header of the REGISTER message; and transmitting the REGISTER message to which the identifier of the V-PLMN is added to an Interrogating-CSCF (I-CSCF).

    DE-REGISTRATION METHOD IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

    公开(公告)号:US20180376446A1

    公开(公告)日:2018-12-27

    申请号:US16065126

    申请日:2017-11-22

    Abstract: Disclosed herein is a network-initiated deregistration method by an access and mobility management function (AMF) in a wireless communication system, including: receiving a first message having a removal reason configured to subscription withdrawn from a unified data management (UDM); and transmitting a deregistration request message for requesting the deregistration to a user equipment (UE), in which the deregistration is enabled to be performed for all accesses in which the UE is registered when the removal cause received from the UDM through the first message indicates the subscription withdrawn of the UE.

    DE-REGISTRATION METHOD IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR

    公开(公告)号:US20180376445A1

    公开(公告)日:2018-12-27

    申请号:US16065075

    申请日:2017-11-22

    Abstract: An aspect of the present invention relates to a UE-initiated de-registration method by an AMF in a wireless communication system, and comprises the steps of: receiving, from UE, a de-registration request message that requests de-registration, wherein the de-registration request message includes de-registration type information and first access type information indicating a target access to which the de-registration is to be applied; requesting, when the UE has an established protocol data unit (PDU) session through the target access, an SMF to release the established PDU session; and transmitting a de-registration accept message to the UE depending on the de-registration type

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