PLMN-Specific CAG Selection Policies for Terminal Network Access
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Solution Overview
Problem
Existing communication systems lack flexibility in configuring manual Closed Access Group (CAG) selection policies for different terminal devices across various Public Land Mobile Networks (PLMNs, leading to inconsistent access control.
Innovation Solution
A communication method and apparatus that allows a core network element to dynamically set CAG selection policies for terminal devices based on first and second information, enabling differentiated policies for different terminal devices and PLMNs, including identifiers, indication information, available quantities, and selection modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a uniform manual CAG selection policy is configured for all terminal devices in a PLMN, then the configuration is simple and easy to manage, but the flexibility and adaptability to different terminal device requirements are poor
Solution Approach 1:
The patent segments the CAG selection policy configuration by introducing PLMN-specific configuration parameters. Instead of a single uniform policy, the system now supports separate manual CAG selection policies for different PLMNs (home PLMN and visited PLMN), allowing differentiated control while maintaining manageable complexity through structured parameter organization.
Solution Approach 2:
The patent implements dynamic policy configuration by allowing the terminal device to selectively apply different manual CAG selection policies based on the current PLMN context. The device can switch between home PLMN policy and visited PLMN policy dynamically, adapting to different network environments without requiring complex manual reconfiguration.
2Adaptability or versatility
If different manual CAG selection policies are configured for different terminal devices, then the adaptability to diverse requirements is improved, but the configuration and management complexity increases
Solution Approach 1:
The patent segments the policy configuration into PLMN-specific components (home PLMN policy and visited PLMN policy), allowing different terminal devices to have customized policies within each PLMN context. This segmentation enables fine-grained control while keeping the overall management structure organized and manageable through standardized parameter templates.
Solution Approach 2:
The patent applies local quality by allowing different CAG selection policies to be configured for different PLMNs based on specific local requirements. Each PLMN can have its own tailored policy settings, enabling customized access control for different networks while maintaining a unified configuration framework at the device level.
3Adaptability or versatility
If manual CAG selection is restricted to a fixed allowed CAG list, then access control security is maintained, but the ability to meet diversified access requirements is limited
Solution Approach 1:
The patent implements dynamic access control by allowing the terminal device to switch between automatic CAG selection and manual CAG selection modes based on the current PLMN and configured policies. This dynamic approach enables diversified access requirements to be met while maintaining security through policy-based control and network authorization.
Solution Approach 2:
The patent changes the access control parameters by introducing PLMN-specific manual CAG selection policies that can enable or disable manual selection based on the current network context. This allows the system to adapt access control strictness dynamically, permitting more flexible access when needed while maintaining strict control when security requirements are high.
Data Source
AI summary
This application provides a communication method and apparatus, to separately configure, for different terminal devices in different public land mobile networks (PLMNs), different policies. The method includes: A core network element receives a registration request from a terminal device, and then sends a registration response to the terminal device based on first information and/or second information, where the registration response indicates the terminal device to set the first information. The terminal device sets the first information based on the registration response. The first information indicates a selection policy that is determined by the core network element and that is of selecting a closed access group (CAG) by the terminal device when the terminal device accesses a first PLMN, and the second information indicates a selection policy that is determined by the core network element and that is of selecting a CAG by the terminal device when the terminal device accesses the first PLMN.