IMS Emergency Call Verification and Network Mode Switching
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Solution Overview
Problem
Users face delays in making emergency calls due to network limitations and unsupported emergency numbers in VoLTE and VoWIFI networks, which hinder access to critical services during urgent situations.
Innovation Solution
A method that involves sending a verification request to an IMS server when an unsupported communication identification is entered, determining the type of identification, and switching the network mode to initiate a call process, allowing emergency calls to be made through a 2G/3G network if necessary, ensuring that emergency numbers can reach the appropriate centers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If VoLTE or VoWIFI network is used for emergency calls, then call quality and speed are improved, but some emergency numbers cannot be called due to operator network limitations
Solution Approach 1:
The patent introduces an IMS server as an intermediary to verify emergency numbers. When a user dials an emergency number, the terminal sends a verification request to the IMS server, which checks whether the number is a supported emergency number. This intermediary verification mechanism allows the system to maintain high-speed VoLTE/VoWIFI calling while ensuring compatibility with emergency numbers that may not be directly supported by the operator network.
2Adaptability or versatility
If network mode switching is implemented to support all emergency numbers, then compatibility is improved, but call establishment time increases
Solution Approach 1:
The patent implements preliminary verification of emergency numbers through the IMS server before the actual call is established. The terminal proactively checks whether the dialed number is a supported emergency number while the user is still in the dialing phase. This preliminary action allows the system to prepare the appropriate network mode in advance, avoiding time-consuming network switching during the call establishment phase and thus reducing overall call setup time.
3Reliability
If emergency call verification is added to the calling process, then reliability of emergency calls is improved, but system complexity increases
Solution Approach 1:
The patent implements a self-service verification mechanism where the terminal autonomously communicates with the IMS server to verify emergency numbers. The terminal itself initiates the verification request, receives the verification result, and automatically determines the appropriate network mode based on the response. This self-service approach eliminates the need for complex manual configuration or additional network infrastructure, achieving reliable emergency call verification while keeping the system relatively simple.
Data Source
AI summary
A calling method includes steps of sending a verification request to a verification server based on an IP multimedia subsystem (IMS) network when a terminal receives a call instruction, triggered by a communication identification from a user input, under a voice over long-term evolution (VoLTE) network or a voice over WIFI (VoWIFI) network, and the communication identification is not a communication identification supported by a current terminal; receiving a response message returned by the verification server based on the verification request; determining a type of the communication identification according to the response message; and according to the communication identification and the type of the communication identification, switching a network mode of an operator network to which the terminal is currently connected to a target network mode to initiate a call process.