Wi-Fi Calling UE Transmitting Last Accessed Network Information
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Solution Overview
Problem
In modern telecommunication systems, when a user equipment (UE) receives a Wi-Fi call, it does not provide information about its last accessed cellular network to the service provider, which hinders network performance analysis and service optimization.
Innovation Solution
The UE is designed to transmit its last accessed network information, including radio access technology, radio cell identity, and location, to the service provider upon receiving a call, allowing mobile network operators to collect and analyze data from both originating and terminating WFC UEs to assess network performance based on key indicators like call success rates and registration success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transmits last accessed network information when receiving a Wi-Fi call, then network performance analysis capability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The UE pre-collects and stores last accessed network information (cell ID, radio access technology, location) in memory before the Wi-Fi call is established. This preliminary action ensures the data is ready for transmission without requiring complex real-time collection mechanisms during the call setup phase.
Solution Approach 2:
The patent introduces an intermediary information element (IE) structure that carries last accessed network information within existing SIP signaling messages. This intermediary approach allows data transmission without creating entirely new signaling protocols, thereby reducing overall system complexity while enabling precise network performance measurement.
2Measurement precision
If the UE transmits last accessed network information upon receiving a Wi-Fi call, then network performance analysis capability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the transmission of last accessed network information with existing SIP call setup signaling messages (such as SIP INVITE or 200 OK). By combining multiple information types into a single signaling exchange, the patent avoids additional separate signaling messages, thereby reducing overall signaling overhead while still delivering the required measurement data.
Solution Approach 2:
The information element structure designed in the patent is multi-functional, capable of carrying various network information types (cell ID, radio access technology, location) within a single standardized format. This universal structure can be reused across different Wi-Fi calling scenarios and network types, reducing the need for multiple specialized signaling mechanisms.
Data Source
AI summary
The systems, devices, and methods discussed herein are directed to a Wi-Fi calling (WFC) portable communication device, or a user equipment (UE), for providing information regarding a cellular network that a terminating WFC UE has last accessed. In response to receiving a call in a wireless local area network (WLAN), the terminating WFC UE transmits the information regarding the last accessed cellular network, such as radio access technology and radio cell identity to a service provider.