Mobile Station ISR Deactivation for Voice Configuration Sync
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Solution Overview
Problem
When voice service configuration information is updated in a mobile station, the existing systems do not deactivate the Idle mode Signalling Reduction (ISR) mechanism, leading to discrepancies in voice service configuration information between mobility management nodes, causing unintended RAN selection that may not conform to the updated priority settings.
Innovation Solution
The mobile station is equipped with a communication control unit that deactivates the ISR when voice service configuration information is updated, ensuring that the mobile station performs location registration procedures with the appropriate mobility management nodes to synchronize the updated information, thereby preventing discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ISR is activated to reduce location registration procedures during reselection between different RANs, then signalling overhead is reduced, but voice service configuration information becomes inconsistent between mobility management nodes
Solution Approach 1:
The mobile station performs location registration with both mobility management nodes (MME and SGSN) before ISR is activated. This preliminary action ensures that both nodes have synchronized voice service configuration information before the mobility station enters idle mode with ISR activated, preventing information inconsistency during subsequent RAN reselections
Solution Approach 2:
The system implements a feedback mechanism where the mobile station checks whether voice service configuration information has been updated while in idle mode with ISR activated. When an update is detected, the mobile station triggers a location registration procedure to synchronize the information with mobility management nodes, ensuring consistency is maintained
2Loss of information
If location registration procedure is performed every time mobile station reselects between different RANs, then voice service configuration information is kept synchronized, but network load increases
Solution Approach 1:
The mobile station performs location registration with both mobility management nodes before activating ISR, establishing synchronized voice service configuration information in advance. This preliminary action eliminates the need for frequent location registrations during RAN reselections, reducing network load while maintaining information consistency
Solution Approach 2:
The system changes the operational state parameter of the mobile station from frequent location registration mode to ISR activated idle mode. This parameter change allows the mobile station to reduce location registration procedures during RAN reselection while maintaining voice service configuration information consistency through selective updates when changes are detected
Data Source
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AI summary
In one embodiment, a mobile station (1) is capable of performing location registration procedures with first and second mobile management units (31 and 32) that respectively correspond to first and second RANs (Radio Access Networks). Further, the mobile station (1) supports ISR (Idle mode Signalling reduction) for reducing location registration procedures caused by reselection between the first RAN (21) and the second RAN (22). Furthermore, the mobile station (1) is configured to deactivate ISR in the mobile station (1) when voice service configuration information stored in the mobile station (1) is updated when the ISR is activated.