Terminal Network Switching for Voice Service Priority
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Solution Overview
Problem
Users of multi-mode single-standby phones may miss incoming calls when in areas where Circuit Switched Fallback (CSFB) is not supported, as the phone defaults to a 4G network that does not support voice services, resulting in a busy line prompt.
Innovation Solution
A communication system that includes a first communication module for data service and a second communication module for voice service, with determination units to assess real-time network support for CSFB, allowing the terminal to switch to a 2G/3G network for voice service when CSFB is not supported, ensuring priority is given to voice service and preventing missed calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal connects to the 4G network for data service, then data service quality is improved, but voice service availability deteriorates when CSFB is not supported
Solution Approach 1:
The terminal dynamically switches between 4G and 2G/3G networks based on real-time detection of CSFB support status. When CSFB is unavailable, the terminal transitions from 4G (data-optimized) to 2G/3G (voice-capable) network, making the system adaptable rather than static.
Solution Approach 2:
The terminal changes the network selection parameter based on service type requirements. For voice services in non-CSFB areas, it switches to networks supporting circuit-switched domains (2G/3G), while for data services it prefers packet-switched networks (4G).
2Productivity
If the terminal resides in the 4G network, then data service is prioritized, but incoming call reception deteriorates in non-CSFB areas
Solution Approach 1:
The terminal performs preliminary detection of CSFB support status before attempting to receive voice calls. This advance knowledge allows it to proactively switch to appropriate networks (2G/3G) that guarantee voice service availability, preventing the problem rather than reacting to it.
Solution Approach 2:
The terminal introduces an intermediate decision-making layer that detects network capabilities (CSFB support) and mediates between the desire for 4G data service and the need for reliable voice service, selecting the appropriate network based on current service requirements.
3Device complexity
If the terminal uses a single communication module for both data and voice services, then device complexity is reduced, but service reliability deteriorates when network compatibility issues occur
Solution Approach 1:
The terminal segments communication functionality into separate modules: a first communication module for data services (4G) and a second communication module for voice services (2G/3G). This segmentation allows each module to be optimized for its specific service type while maintaining overall system reliability.
Solution Approach 2:
The terminal achieves multi-functionality by having multiple communication modules that can be selectively activated based on service requirements. The system universally handles both data and voice services through appropriate module selection rather than requiring a single module to handle all functions.
Data Source
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AI summary
Provided is a communication system, which is applied to a terminal and comprises: a first communication module; a second communication module; a first judgement unit for judging whether the terminal supports a circuit switched fallback currently according to a real-time state of the terminal; and a processing unit for establishing a connection between the first communication module and a first network when the judgement result of the first judgement unit is yes, and for establishing a connection between the second communication module and a second network when the judgement result of the judgement unit is no. Accordingly, further provided are a terminal and a communication method. By means of the technical solution in the present invention, when a terminal does not support a circuit switched fallback, a network resides in a second network which can perform a voice service to guarantee the priority of the voice service, thereby preventing a user from missing an incoming call.