5G NR Call Handling via ePDG Session Control
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Solution Overview
Problem
Electronic devices face issues with maintaining call connections due to handover failures when registering with 5G networks that do not support VoNR, leading to disconnections with external devices.
Innovation Solution
An electronic device is equipped with first and second communication circuitry supporting NR and LTE communications, respectively, and a processor that registers with a network using NR communication, connects with an ePDG, obtains call function information, and controls connections based on this information to prevent unnecessary handovers and maintain communication using NR communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the electronic device performs handover to a 5G network when Wi-Fi call connection cannot be maintained, then network coverage is improved, but call connection reliability deteriorates due to handover failure
Solution Approach 1:
The electronic device checks in advance whether the 5G network supports VoNR call function before performing handover. This preliminary verification prevents handover to networks that cannot maintain call connections, thereby avoiding handover failures while still enabling network switching for coverage improvement.
Solution Approach 2:
The device obtains feedback information about the 5G network's VoNR support capability from the network side before handover. Based on this feedback, the device makes an informed decision about whether to proceed with handover, ensuring that call connection reliability is maintained while still achieving network coverage improvement.
2Reliability
If the electronic device checks VoNR support information before handover, then call connection reliability is improved, but communication time is increased due to additional information acquisition
Solution Approach 1:
The device performs the VoNR support check as a preliminary action during the network selection process, before actual handover execution. This timing ensures that the information is obtained efficiently without adding significant delay to the critical handover operation, balancing reliability improvement with time loss minimization.
3Area of stationary object
If the electronic device maintains registration with 5G network without checking call function support, then network connectivity is improved, but call function availability deteriorates
Solution Approach 1:
The device checks for VoNR call function support specifically in the 5G network context, rather than treating all networks uniformly. This targeted approach ensures that call function availability is verified where needed (in 5G networks) while maintaining overall network connectivity benefits.
Data Source
AI summary
The disclosure relates to an apparatus and method for providing a call function in an electronic device. The electronic device includes first communication circuitry supporting new radio (NR) communication and/or long term evolution (LTE) communication, second communication circuitry supporting wireless local area network (LAN) communication, and at least one processor operatively connected to the first communication circuitry and the second communication circuitry. The processor may be configured to resister the electronic device with a network using the NR communication through the first communication circuitry, connect communication with an evolved packet data gateway (ePDG) based on a protocol data unit (PDU) session being identified as being connected over a network using wireless LAN communication in a state in which the electronic device has registered with the network using the NR communication, obtain information related to a call function of the network using the NR communication based on the communication connection with the ePDG, connect the PDU session over the network using the wireless LAN communication, and control the connection with the network using the NR communication based on the information related to the call function of the network using the NR communication.