Cellular Registration Recovery for Shared IMSI Collisions
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Solution Overview
Problem
The exhaustion of available International Mobile Subscriber Identifiers (IMSIs) and the resulting collisions when using shared IMSIs lead to interruptions in cellular network service for subscription devices, particularly when roaming, as networks fail to recognize these collisions, causing service degradation and loss.
Innovation Solution
Implementing a method in subscription devices that includes a connection test procedure to detect service loss promptly and trigger a second registration request using a different IMSI, along with a tracking mechanism to optimize IMSI allocation and reduce service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If shared IMSIs are used to reduce the total number of identifiers, then device complexity and cost are reduced, but service reliability deteriorates due to collisions and service interruptions
Solution Approach 1:
The system performs preliminary actions by detecting service loss conditions before they fully impact the device. The connection test procedure proactively identifies when service is lost due to IMSI collision, allowing the system to prepare and execute a second registration request with a different IMSI before complete service failure occurs, thereby maintaining service continuity.
Solution Approach 2:
The system implements feedback mechanisms through connection test procedures that continuously monitor service status. When service loss is detected (indicating IMSI collision), the system uses this feedback information to trigger alternative registration requests with different IMSIs, creating a closed-loop system that adapts to collision conditions and maintains reliable service.
2Device complexity
If networks do not recognize IMSI collision, then network complexity is reduced, but service reliability deteriorates due to unrecognized service loss
Solution Approach 1:
The system enables self-service by having the device autonomously detect service loss conditions and initiate recovery procedures without requiring network recognition of the collision situation. The device performs connection tests, identifies service loss, and triggers alternative registration requests independently, eliminating the need for complex network-side collision detection while maintaining service reliability.
3Reliability
If connection test procedure is implemented to detect service loss, then service reliability is improved, but device complexity increases due to additional tracking mechanisms
Solution Approach 1:
The system applies partial action by implementing connection test procedures that perform only the necessary minimum detection function to identify service loss conditions. Rather than comprehensive monitoring of all possible failure modes, the system focuses on detecting specific service loss indicators that trigger IMSI collision recovery, achieving reliable service continuity with minimal added complexity.
Data Source
AI summary
Some embodiments relate to a computer implemented method for managing requests too register subscription devices for service with one or more cellular networks is provided. The method involves storing data representing a plurality of registration record, each being indicative of a respective subscription device being registered for service with a respective cellular network using a respective IMSI. A request to register a subscription device for service is received, the request including at least an IMSI and being associated with one or more request characteristics. An outcome for the request is generated based on whether the plurality of registration records are indicative of another subscription device being registered for service, and if so, at least one of the one or more request characteristics. A computer system for performing the method, and a non-transitory computer readable storage medium are also provided.