Terminal Emergency Call IMS CS Domain Fallback Mechanism
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Solution Overview
Problem
Existing emergency call methods in terminals fail to establish calls when the IMS domain is unsupported, leading to safety hazards for users.
Innovation Solution
A method and apparatus that determine whether the current network device supports emergency calls on the IMS domain, and if not, establish the emergency call on the CS domain, ensuring prioritization of IMS domain calls and fallback to CS domain if IMS domain fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal attempts to establish an emergency call on the IMS domain, then the call establishment process is simplified and prioritized, but the terminal cannot establish an emergency call when the network device does not support IMS domain
Solution Approach 1:
The terminal performs preliminary detection of network device support for IMS domain emergency calls before attempting to establish the call. This preliminary action allows the terminal to prepare the appropriate call establishment parameters and select the correct domain (IMS or CS) in advance, avoiding failed call attempts and improving overall reliability while maintaining simplified operation.
Solution Approach 2:
The patent introduces an intermediary detection mechanism that mediates between the terminal's emergency call request and the network's capability. This intermediary layer (the detection and selection mechanism) determines whether to route the call through IMS or CS domain based on network support, resolving the contradiction between operational simplicity and reliability by adapting to network conditions.
2Speed
If the terminal prioritizes IMS domain for emergency calls, then the call establishment speed is improved, but the terminal lacks fallback capability when IMS domain is unsupported
Solution Approach 1:
The terminal employs a dynamic domain selection mechanism that adapts its behavior based on real-time network conditions. When IMS domain is supported, the terminal uses it for fast emergency call establishment. When IMS is not supported, the terminal dynamically switches to CS domain, maintaining both speed and adaptability through this dynamic adjustment capability.
Solution Approach 2:
The patent changes the parameter of domain selection based on network capability detection. The terminal modifies its call establishment parameters (selecting either IMS or CS domain) according to the detected network support status, enabling it to maintain fast call establishment when possible while adapting to network constraints when necessary.
3Reliability
If the terminal uses CS domain for emergency calls, then the terminal can establish calls when IMS domain is unsupported, but the call establishment process becomes more complex
Solution Approach 1:
The patent segments the emergency call establishment process into distinct phases: network capability detection, domain selection, and call establishment. This segmentation allows the terminal to handle the complexity systematically by separating the detection and selection logic from the actual call establishment, making the overall process more manageable while maintaining high reliability through proper domain routing.
Data Source
AI summary
Provided are an emergency call method and apparatus, a storage medium, and a terminal, related to the technical field of communications. Firstly, it is determined whether the current network device supports an emergency call established on an IMS domain; then, if the current network device supports the emergency call established on the IMS domain, the emergency call is established on the IMS domain. Finally, if the emergency call established on the IMS domain fails, the emergency call is established on the CS domain. If the current network device supports the emergency call established on the IMS domain, it represents that the current network allows the emergency call established on the IMS domain, so the emergency call can be prioritized to be established on the IMS domain, and when the emergency call established on the IMS domain fails, the emergency call may also be established on the CS domain.