Device, system and method for VoLTE setup

    公开(公告)号:US10966260B2

    公开(公告)日:2021-03-30

    申请号:US15755360

    申请日:2015-08-28

    Applicant: APPLE INC.

    Abstract: A device, system, and method performs a Voice over Long Term Evolution (LTE) (VoLTE) call setup procedure. The device includes a transceiver establishing a connection with a LTE network and an Internet Protocol (IP) Multimedia Subsystem (IMS). The device includes a processor executing a VoLTE call application with a further user equipment, receiving an input to execute the VoLTE call application, and generating a data packet including an indication to trigger a dedicated bearer establishment procedure. The transceiver transmits the data packet to one of the LTE network and the IMS. The indication triggers the dedicated bearer establishment procedure to be performed during a Session Initiation Protocol (SIP) signal exchange procedure.

    SYSTEMS AND METHODS FOR ENHANCED POWER CONTROL UNDER POOR CHANNEL CONDITIONS

    公开(公告)号:US20240073827A1

    公开(公告)日:2024-02-29

    申请号:US18351016

    申请日:2023-07-12

    Applicant: APPLE INC.

    CPC classification number: H04W52/245 H04W52/42

    Abstract: Systems and methods for enhanced power control at a user equipment (UE) under poor channel conditions respective to antenna transmit diversity (ATD) mechanisms are discussed herein. In some embodiments, a UE may reset a transmit power control (TPC) power adjustment value when an ATD antenna switch of the ATD mechanism is performed. In some embodiments, a UE may reduce the value of an ATD hysteresis timer upon determining that a reference signal receive power (RSRP) change on a monitored reference signal that drives a pathloss calculation at the UE exceeds a threshold. In some embodiments, a UE may scale a filtering coefficient of a pathloss calculation mechanism upon determining that an RSRP change on a monitored reference signal that drives a pathloss calculation at the UE exceeds a threshold.

    Fake base station detection
    39.
    发明授权

    公开(公告)号:US11503472B2

    公开(公告)日:2022-11-15

    申请号:US16614787

    申请日:2017-05-31

    Applicant: Apple Inc.

    Abstract: A mobile device collects received information and processes it. In some instances, the mobile device detects, based on the collected information, that a base station is likely not legitimate, i.e., it is likely a fake base station, and the mobile device bars communication with the base station for a time. In some embodiments, the mobile device determines, based on the received information, that the base station is a genuine base station. When the mobile device determines that the base station is a genuine base station or the mobile device does not determine that it is likely the base station is a fake base station, the mobile device allows or continues communication with the base station.

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