Pre-paging Call Information Transmission for CS Fallback Control
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Solution Overview
Problem
In communication systems compatible with CS fallback, call information such as call type is not transmitted during pre-paging, leading to users being unaware of incoming voice calls during data communication, resulting in unintended network switching and potential disruption of high-speed data services.
Innovation Solution
A communication system that includes a first mobile communication switching device, a subscriber information management device, and a second mobile communication switching device, which transmits call information to the called-side mobile communication terminal during pre-paging, allowing users to recognize call contents early and make informed decisions about network switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pre-paging is performed before routing number allocation to increase communication efficiency, then communication efficiency is improved, but call information cannot be transmitted to the called-side terminal
Solution Approach 1:
The patent applies preliminary action by performing pre-paging before routing number allocation, but enhances it by including call information in the paging message. This allows the called terminal to receive advance notification of the incoming call details (calling number, call type) before the actual call establishment, enabling informed decision-making about whether to switch networks or maintain data communication.
2Productivity
If line setting is performed after pre-paging to allocate routing numbers, then communication efficiency is improved, but users cannot recognize call contents early and make informed decisions
Solution Approach 1:
The patent provides call information (calling number, call type) in the pre-paging message, enabling users to recognize call contents before the line setting and routing number allocation are completed. This preliminary information provision allows users to make informed decisions about whether to terminate data communication and respond to the call, or maintain high-speed data services, thereby reducing unnecessary network switching and data communication interruptions.
3Adaptability or versatility
If CS fallback is automatically performed when a call is made during data communication, then voice call service is provided, but high-speed data services are disrupted and users cannot maintain data communication
Solution Approach 1:
The patent implements feedback by providing call information to the called terminal during pre-paging, enabling the user to make an informed decision about whether to perform CS fallback. The user can choose to maintain data communication by not responding to the pre-paging notification, or switch to voice call service by terminating data communication and responding to the call. This feedback mechanism eliminates automatic CS fallback, allowing users to maintain high-speed data services when appropriate.
Data Source
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AI summary
In a communication control system 1, in an acquisition step of acquiring routing information before a line is set, a first mobile communication switching device 100 generates an acquisition request signal of routing information, which includes calling/called number specifying information and call information, and transmits the acquisition request signal to a subscriber information management device 200. The call information includes calling number information specifying a calling-side mobile communication terminal 600 and call type information representing a type of a call from the calling-side mobile communication terminal 600. The subscriber information management device 200 specifies a called-side second mobile communication switching device 300 based on the acquisition request signal and transmits an issuance request signal of a routing number to the second mobile communication switching device 300. The second mobile communication switching device 300 transmits the call information to a called-side mobile communication terminal 700 when a calling signal for acquiring the routing number is transmitted to the mobile communication terminal 700.