Handling of timer expiry for MT CSFB

    公开(公告)号:US11044786B2

    公开(公告)日:2021-06-22

    申请号:US16489222

    申请日:2018-06-27

    Applicant: APPLE INC.

    Abstract: Apparatuses and computer-readable storage media for handling timers for mobile terminated circuit-switched fallback (MT CSFB) calls. An apparatus for a user equipment (UE) includes processing circuitry operably coupled to a data storage device. The data storage device is configured to store a value of an extended service request for mobile terminated services (EXT-MT) timer. The value of the EXT-MT timer is less than a value of a guard timer of a Visitor Location Register (VLR). The processing circuitry is configured to start the EXT-MT timer and generate an extended service request message to be transmitted to a Mobility Management Entity (MME) responsive to a paging for an MT CSFB call, and attempt to select a radio access technology of a different type of network if the EXT-MT timer expires before the UE successfully performs inter system change and a circuit switched fallback cancellation request was not received from a subscriber.

    Cellular IOT control and user plane switching

    公开(公告)号:US10827542B2

    公开(公告)日:2020-11-03

    申请号:US16073997

    申请日:2016-09-30

    Applicant: Apple Inc.

    Abstract: Simultaneous control plane and user plane user data transfer, for CIoT devices, and switching between control plane and user plane data transfer, for the CIoT devices, may be performed for Control Plane CIoT EPS Optimization and user plane data transmission. In one implementation, a flag value is set within a Non-Access-Stratum (NAS) EPS Mobility Management (EMM) message to indicate to the network to establish a user plane connection (e.g., an S1-U bearer and data radio bearer (DRB)). The NAS message may be transmitted when the user device is in connected mode of operation.

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