PLMN Access Method for Base Station Failure Recovery
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Solution Overview
Problem
When a failure occurs in the base station of a first Public Land Mobile Network (PLMN) operator, there is no established method for another PLMN to provide services to subscribers of the affected operator, leading to service disruptions, especially for critical communications like emergency calls or corporate VPN services.
Innovation Solution
A method where a User Equipment (UE) can access a second PLMN that has a roaming agreement with the first PLMN, allowing it to display information indicating access to the second PLMN and providing limited services, such as voice calls and text messages, while prioritizing voice and SMS requests over data services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE attempts to access the first PLMN base station, then normal service is provided, but service disruption occurs when base station failure happens
Solution Approach 1:
The network pre-configures alternative PLMN information and service redirection rules in the UE before failure occurs. When base station failure is detected, the UE can immediately access the second PLMN without extensive negotiation, ensuring service continuity for critical communications
Solution Approach 2:
The second PLMN acts as an intermediary network that temporarily provides services to UEs from the first PLMN during failure. The network nodes establish temporary service paths through the second PLMN, enabling continued access to communication services while maintaining logical connection to the home network
2Adaptability or versatility
If the second PLMN provides full services to first PLMN subscribers, then service coverage is improved, but network resource consumption and complexity increase
Solution Approach 1:
The second PLMN provides differentiated service quality to first PLMN subscribers based on service type. Critical services like voice calls and SMS receive full service quality, while data services receive limited or prioritized access. This local quality differentiation ensures essential communications are maintained without over-provisioning all service types
Solution Approach 2:
The second PLMN implements partial service provision, offering only essential services (voice, SMS) with full quality and limiting data services. This partial action approach provides sufficient service coverage for critical communications while avoiding the complexity and resource consumption of providing complete service portfolios
3Reliability
If voice and SMS services are prioritized over data services, then critical communication reliability is improved, but data service quality deteriorates
Solution Approach 1:
The network dynamically changes service parameters based on service type and network conditions. Voice and SMS services are assigned higher priority parameters ensuring reliable delivery, while data services receive lower priority parameters that may throttle bandwidth or delay transmission. This parameter differentiation maintains critical communication reliability while managing data service performance under resource constraints
Data Source
AI summary
A disclosure of the present specification provides a method for accessing another Public Land Mobile Network (PLMN) instead of a subscribed third PLMN. According to the method, a terminal may access a second PLMN, which provides a service, instead of a first PLMN that is roaming-agreed with the third PLMN. In addition, according to the method, the terminal may display, on a screen, information indicating that access is made to the second PLMN. The second PLMN may provide only a limited service.