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US Patent 11032746 Voice service handover

Patent 11032746 was granted and assigned to British Telecommunications Public Limited Company on June, 2021 by the United States Patent and Trademark Office.

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Patent abstract

A user entity (UE) such as a smartphone is configured to connect to both WiFi and a Long Term Evolution (LTE) cellular network for voice and data services. For voice, the UE supports both Voice over LTE (VoLTE) and Voice over WiFi (VoWiFi). When the UE is connected to VoWiFi and roaming from a first WiFi access point to a second WiFi access point, the UE and Mobility Management Entity in the cellular network carry out a preparatory handover to VoLTE to prevent service loss in the event of an unsuccessful VoWiFi connection from the second WiFi access point.

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