Multi-SIM Modem Delaying Module for Missed Call Reduction
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Solution Overview
Problem
Dual SIM Dual Standby mobile devices can only monitor one subscriber identity at a time due to a single radio module, leading to missed calls on the other subscription when one subscription is active, especially due to packet background services running without user awareness.
Innovation Solution
A multiple subscriber identity modem with a delaying module that determines if a service request belongs to a non-urgent class and delays the access grant until the next paging occasion, avoiding missed calls without compromising Quality of Service (QoS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the modem grants access to packet background services immediately, then the service quality is maintained, but missed calls occur on the other subscription
Solution Approach 1:
The system performs preliminary classification of services into urgent and non-urgent categories before granting access. Non-urgent services are identified in advance and scheduled to avoid paging occasions, while urgent services receive immediate access. This preliminary categorization prevents missed calls without significantly impacting overall service responsiveness.
Solution Approach 2:
The access grant mechanism dynamically adjusts based on the timing relative to paging occasions. The system continuously monitors the timing of service requests against scheduled paging occasions and adaptively delays non-urgent services only when necessary, while maintaining immediate access for urgent services. This dynamic adjustment resolves the contradiction by making the system flexible rather than static.
2Reliability
If the modem monitors both subscriber identities simultaneously, then call reception on both subscriptions is improved, but the device complexity increases
Solution Approach 1:
The system implements periodic monitoring of paging occasions for the second subscriber identity while maintaining active connection for the first subscription. Instead of continuous simultaneous monitoring which would require complex hardware, the system periodically checks paging occasions at predetermined intervals, achieving multi-subscription availability with a single radio module through time-division multiplexing.
3Reliability
If the modem delays all background services, then missed calls are avoided, but the Quality of Service deteriorates
Solution Approach 1:
The system applies different quality treatments to different services based on their urgency classification. Non-urgent background services experience delayed access to protect call reception, while urgent services receive immediate access without delay. This local differentiation of service quality ensures that reliability improvement does not come at the cost of overall service performance degradation.
Data Source
AI summary
Multiple subscriber identity modem (10) capable of receiving messages related to at least two subscriber identities, characterized in that it comprises a delaying module (19) configured to: —determine, from a connection request for a service associated with a first subscriber identity, whether the service belongs to a first class of communication, and, when the service has been determined as belonging to the first class of communication, —determine whether a remaining time between the connection request and a next paging occasion, associated with a second subscriber identity, is falling on a first side of a threshold, and, when the remaining time has been determined as falling on the first side of the threshold, —delay an access grant indication related to the connection request until the paging occasion has been handled.