Wireless Apparatus Fast Reconnection After Circuit Switched Fallback
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Solution Overview
Problem
Current wireless communication systems experience significant latency when switching back to high-speed data networks after a call over a circuit-switched network, leading to performance and human factors issues.
Innovation Solution
A wireless apparatus and method that employs RAT information to rapidly switch back to a high-speed data network by providing the necessary radio access technology information within the release order or by storing and updating available RAT information from ATIMs, allowing for immediate selection and reconnection to the high-speed data network upon termination of a circuit-switched fallback call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the system waits for overhead messages (ATIM) to obtain RAT information before switching back to high-speed data network, then the switching process follows standard protocols, but the latency increases significantly (up to three minutes)
Solution Approach 1:
The mobile station stores RAT information from ATIM messages in advance during the CSFB call. When the call terminates, the stored RAT information is immediately used to switch back to the high-speed data network without waiting for new overhead messages, thus reducing latency while maintaining protocol compliance
Solution Approach 2:
The patent extracts and stores only the necessary RAT information (radio access technology parameters) from the overhead ATIM messages during the call. This extracted information is sufficient for network switching, allowing the system to bypass the need to wait for complete overhead message sequences after call termination
2Loss of energy
If the system uses standard fallback protocols with overhead messages for network switching, then protocol compliance is maintained, but bandwidth is wasted during the switching transition
Solution Approach 1:
RAT information is obtained and stored in advance during the CSFB call through periodic ATIM messages. This preliminary acquisition eliminates the need for additional overhead message exchanges after call termination, reducing bandwidth consumption while ensuring the information is ready for immediate use
Solution Approach 2:
The mobile station autonomously uses its stored RAT information to initiate the switch back to the high-speed data network without requiring additional network signaling or overhead messages. This self-service approach reduces bandwidth wastage while maintaining reliable switching
Data Source
AI summary
A wireless apparatus having one or more first radios, one or more second radios, interface control, and a processor. The one or more first radios are coupled to one or more first communication links. The one or more second radios are coupled to one or more second communication links. The interface control is coupled to the radios, and selects and executes communications over a specific one of the one or more second communication links following termination of a fallback session over one of the one or more first communication links, where RAT information is employed by the interface control to select the specific one of the one or more second communication links. The processor receives, processes, and provides to the interface control the RAT information, where the RAT information is received prior to termination of the fallback session or as part of termination of the fallback session.