PLMN Selection in Wireless Interworking Mode
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Solution Overview
Problem
Current wireless communication systems, particularly in interworking modes between 3GPP and 3GPP2, lack the ability for manual selection of Public Land Mobile Networks (PLMNs), leading to issues such as excessive roaming charges, inability to register with forbidden PLMNs, and suboptimal data throughput.
Innovation Solution
A method for selecting a PLMN in a wireless communication system that involves detecting operation in an interworking mode, triggering a manual scan to acquire a list of available GSM network-based PLMNs, displaying this list, allowing user selection, and registering with the chosen PLMN, with options to prioritize network classes and handle low-priority PLMNs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic PLMN selection is used in interworking mode, then the system operates without manual intervention, but the user cannot control network selection leading to excessive roaming charges
Solution Approach 1:
The system dynamically switches between automatic and manual PLMN selection modes based on user input. The method enables the UE to transition from automatic selection (default operation) to manual selection mode where the user can view and select from available PLMNs, thereby providing control when needed while maintaining automated operation otherwise.
2Adaptability or versatility
If automatic PLMN selection is used, then the process is simple, but the user cannot register with forbidden PLMNs when needed
Solution Approach 1:
The system adapts its behavior based on user needs by allowing mode switching. In automatic mode, the UE follows standard PLMN selection rules including respecting forbidden PLMN lists. When manual mode is activated, the UE displays all available PLMNs including forbidden ones, and allows user selection despite the forbidden status, thereby providing adaptability while maintaining simple automatic operation as default.
3Adaptability or versatility
If manual scan is implemented in interworking mode, then users can select preferred networks, but the system complexity increases
Solution Approach 1:
The method implements a universal manual scan mechanism that works across both 3GPP and 3GPP2 network modes. The same procedural framework (detect interworking mode → trigger manual scan → display PLMN list → allow user selection) applies regardless of which network standard is being used, thereby providing adaptability without proportionally increasing complexity through separate implementations for each mode.
4Productivity
If automatic network selection is used, then the process is fast, but data throughput may be suboptimal without user preference consideration
Solution Approach 1:
The system performs preliminary action by maintaining a displayed list of available PLMNs ready for user selection. Once the manual scan is triggered and the list is displayed, the user can immediately select from available options without waiting for additional scanning or processing, thereby reducing the time loss while enabling optimal network selection for data throughput.
Data Source
AI summary
A method for selecting a Public Land Mobile Network (PLMN) in a wireless communication system by a User Equipment (UE), the method includes detecting, by the UE, that the UE is operating in an interworking mode, triggering, by the UE, a manual scan in the interworking mode for acquiring a list of PLMNs in the wireless communication system, and causing, by the UE, a display to output the list of PLMNs in response to the triggering.