SRVCC Handover Call State Monitoring via Modem Notification
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Solution Overview
Problem
In wireless communication systems, the application side of a communication device faces difficulty in monitoring the call state during Single Radio Voice Call Continuity (SRVCC) handovers, as the call state is maintained on the modem side, preventing power-saving sleep modes and causing user interface confusion due to incomplete state updates.
Innovation Solution
A method where the modem processor performs SRVCC handovers and sends notifications to the application processor, allowing it to query and monitor the call state, ensuring seamless state transition and power management by initiating sleep modes after successful handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the application side continuously monitors call state during SRVCC handover, then call state visibility is improved, but power consumption increases because the application processor cannot enter sleep mode
Solution Approach 1:
The patent extracts the call state monitoring function from the application processor and relocates it to the modem processor. The modem processor independently monitors the call state during SRVCC handover and sends notifications to the application processor only when state changes occur. This extraction allows the application processor to enter sleep mode while maintaining call state visibility through the modem processor's monitoring capabilities.
Solution Approach 2:
The patent introduces an intermediary notification mechanism where the modem processor acts as a mediator between the actual call state (maintained in modem) and the application processor. The modem processor monitors call state and sends asynchronous notifications to the application processor, which then updates the user interface. This intermediary approach eliminates the need for continuous application processor involvement, enabling power-saving sleep modes while maintaining information visibility.
2Measurement precision
If the application side monitors call state during SRVCC handover, then user interface accuracy is improved, but system complexity increases due to additional monitoring and notification mechanisms
Solution Approach 1:
The patent extracts the monitoring burden from the application side and places it on the modem side, which already has direct access to call state information. The modem processor monitors call state and sends notifications to the application processor, which simply receives and displays the information. This extraction maintains user interface accuracy while avoiding the complexity of implementing monitoring mechanisms in the application layer.
Solution Approach 2:
The modem processor performs self-service by autonomously monitoring its own call state and generating notifications when state changes occur. This self-service approach eliminates the need for complex inter-process communication and continuous polling mechanisms, reducing system complexity while ensuring accurate call state reflection in the user interface through the notification-driven update model.
Data Source
AI summary
A method of monitoring a call state over a single radio voice call continuity (SRVCC) handover, for a communication device in a wireless communication system is provided. The method includes performing, by a modem processor of the communication device, the SRVCC handover from a first type call to a second type call when an SRVCC handover command is received from a network of the wireless communication system, sending, by the modem processor, a first indication for notifying an occurrence of SRVCC handover to an application processor of the communication device, and monitoring, by the application processor, a call state of the second type maintained in the modem processor after the first indication is received.