Mobile Terminal Dual Network Registration for Voice Service
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Solution Overview
Problem
In CS fallback-incompatible scenarios, mobile communication terminals cannot transition from the 3.9G network to the 2G/3G network for voice calls, leading to potential service disruptions due to incompatible MSC/VLR and MME management systems across different regions.
Innovation Solution
A mobile communication terminal is designed to perform location registrations in both 2G/3G and 3.9G networks, with specific hardware and software configurations enabling it to switch between networks for data and voice communications, even in areas where CS fallback is not supported, by correlating location registration information and discarding switching indication signals to maintain connectivity in the 2G/3G network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile communication terminal performs CS fallback to transition from 3.9G network to 2G/3G network for voice calls, then voice call service can be received, but the terminal cannot operate in areas where MSC/VLR and MME are independently managed without compatibility
Solution Approach 1:
The terminal performs location registration in both 2G/3G network and 3.9G network before actual use. By preemptively registering in both networks and storing location registration information, the terminal ensures it can immediately switch to the appropriate network for voice calls without encountering compatibility issues when entering areas with independently managed MSC/VLR and MME
Solution Approach 2:
The terminal uses location registration information as an intermediary to determine network compatibility. By checking whether location registration in 2G/3G network is successful, the terminal can identify areas where MSC/VLR and MME are independently managed without compatibility, and adjust its network selection strategy accordingly
2Speed
If the terminal is made to be resident only in 3.9G network for high-speed data communication, then data communication speed is improved, but voice call service may not be received in CS fallback-incompatible areas
Solution Approach 1:
The terminal dynamically adjusts its network residence based on service requirements and compatibility status. When in CS fallback-compatible areas, the terminal resides in 3.9G network for high-speed data communication. When in CS fallback-incompatible areas, the terminal switches to residing in 2G/3G network to ensure voice call service, thus adapting its network selection to current conditions
3Adaptability or versatility
If the terminal switches between 2G/3G and 3.9G networks based on service requirements, then both voice call and high-speed data communication can be supported, but network switching complexity increases
Solution Approach 1:
The terminal uses feedback from location registration results to automatically determine network compatibility status. By monitoring whether location registration in 2G/3G network succeeds or fails, the terminal automatically adjusts its network selection without requiring complex manual configuration or user intervention, thus reducing perceived complexity while maintaining versatility
Data Source
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AI summary
A mobile communication terminal includes a location registration request unit 120 that makes a location registration request for a location registration in each of the mobile communication networks 200 and 300 to a 3.9G network 300, a location registration response receiving unit 130 that receives a location registration response representing a result of the location registration in the both mobile communication networks 200 and 300 in response to the request for the location registration, a location registration determination unit 140 that determines whether or not the location registration only in the 3.9G network 300 between the both mobile communication networks 200 and 300 is completed, based on the location registration response, and a first mobile communication network switching control unit 150 that performs a switching control of the mobile communication network for causing the mobile communication terminal 100 to be resident in the 2G/3G network 200 in a case where the location registration determination unit 140 determines that the location registration only in the 3.9G network 300 is completed.