UE Cell Reselection for Fast Return to Home PLMN
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Solution Overview
Problem
Cellular devices often connect to roaming networks when a home network is available, incurring unnecessary roaming fees for the home network operator.
Innovation Solution
Implementing a method and system for user equipment (UE) to prioritize and reconnect to the home Public Land Mobile Network (PLMN) by determining and selecting the highest priority PLMN identity through a predefined preferred frequency, rescanning for PLMN identities, and connecting to the highest priority PLMN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellular devices connect to roaming networks when home network is available, then network coverage and connectivity are maintained, but roaming fees are incurred for the home network operator
Solution Approach 1:
The system performs preliminary scanning and detection of home network PLMN identities before finalizing network attachment. The UE proactively searches for home network cells and evaluates their suitability before committing to a roaming network, thereby preventing unnecessary roaming fee incurrence while ensuring connectivity is maintained through advance network assessment
Solution Approach 2:
The invention changes the network selection parameters by introducing PLMN identity-based prioritization and home network preference settings. The system modifies the traditional signal-strength-only selection criterion to include PLMN identity matching, allowing the UE to prefer home network cells even with comparable signal quality, thus reducing roaming fees while maintaining reliable connectivity
2Stability of the object's composition
If cellular devices stay camped on roaming network cells even when home network cell is available, then connection stability is maintained, but unnecessary roaming costs are incurred
Solution Approach 1:
The system implements continuous feedback monitoring of available PLMN identities and their priorities. The UE periodically scans for home network PLMNs and uses this feedback to dynamically adjust its network attachment decisions. When home network cells become available, the feedback mechanism triggers a reevaluation and potential switch from roaming to home network, thereby eliminating unnecessary roaming fees while maintaining connection stability through controlled transitions
Solution Approach 2:
The invention introduces dynamic network selection behavior that adapts based on real-time PLMN availability. Rather than statically remaining on a roaming network for stability, the system dynamically evaluates home network options and transitions when beneficial. This dynamic approach allows the UE to optimize between connection stability and cost reduction by making informed, real-time network selection decisions
3Productivity
If cellular devices perform frequent PLMN scanning to find home network, then network optimization is improved, but device energy consumption and processing time increase
Solution Approach 1:
The system employs periodic PLMN scanning at optimized intervals rather than continuous scanning. The UE performs scanning at predetermined time intervals and triggers scans based on specific events such as signal quality degradation or location changes. This periodic approach maintains network optimization by regularly checking for home network availability while significantly reducing energy consumption compared to continuous scanning
Solution Approach 2:
The invention implements partial scanning by focusing detection efforts on frequencies and cells likely to contain home network PLMNs based on historical data and current context. Rather than exhaustively scanning all possible frequencies, the system performs targeted partial scans that achieve network optimization with reduced processing and energy expenditure, balancing thoroughness with efficiency
Data Source
AI summary
Various embodiments of apparatus, systems and/or methods are described for providing cell reselection from a visiting PLMN to home PLMN in scenarios where the UE is camped to a visiting cell with an Equivalent HPLMN identity. The method may include cell reselection from one radio frequency broadcasting the Equivalent HPLMN identity to another preferred radio frequency that broadcasts only the visiting PLMN identity by leveraging frequency selection priority, and subsequent cell reselection from the visiting PLMN identity with the visiting PLMN cell to the home PLMN identity with the home PLMN cell by using high priority home PLMN identity search. The method provides a means to allow the UE to quickly come back to home PLMN when entering home coverage, otherwise the UE would have to move out of the coverage of the Equivalent HPLMN identity from the border cells of the visiting PLMN by radio refrequency rescan and selection.