Dynamic PLMN Roaming for HPLMN Fault Recovery
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Solution Overview
Problem
In existing communication networks, when a fault occurs in a home public land mobile network (HPLMN) that a terminal device cannot access, there is no method for the device to access other operator networks without a signed roaming agreement.
Innovation Solution
A dynamic roaming agreement is enabled between the HPLMN and a second PLMN, allowing the terminal device to access the second PLMN when it cannot access the HPLMN, and upon recovery of the HPLMN, the agreement is disabled, enabling the device to return to the HPLMN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device cannot access its home PLMN due to a fault, then the device loses connectivity to its primary network, but currently there is no method to access alternative operator networks without a signed roaming agreement
Solution Approach 1:
The patent implements dynamic roaming agreements that can be automatically established and torn down based on real-time network conditions. When the HPLMN is unavailable, the terminal device dynamically activates roaming to alternative PLMNs without requiring pre-signed agreements. This dynamic approach allows the system to adapt connectivity options based on current fault conditions, resolving the contradiction between maintaining reliable connectivity and the inability to access alternative networks.
Solution Approach 2:
The patent introduces a core network element that acts as an intermediary to manage dynamic roaming agreements. This intermediary receives fault information from the HPLMN, automatically establishes roaming agreements with alternative PLMNs on behalf of the terminal device, and coordinates the handover process. This intermediary mechanism enables network switching without requiring pre-existing roaming agreements or direct terminal device involvement in agreement negotiation.
2Reliability
If the terminal device switches to an alternative PLMN during HPLMN fault, then service continuity is maintained, but network switching adds complexity to the roaming management process
Solution Approach 1:
The patent implements self-service mechanisms where the core network element automatically detects HPLMN faults, initiates dynamic roaming agreement establishment with alternative PLMNs, and manages the terminal device handover without manual intervention. The system autonomously monitors network status, activates roaming when needed, and tears down agreements when the HPLMN recovers. This automation reduces the perceived complexity for users while maintaining service continuity.
Solution Approach 2:
The patent employs feedback mechanisms where the core network element continuously monitors HPLMN availability and uses this feedback to dynamically control roaming agreement states. When fault information is received, the system feedback triggers roaming activation; when recovery is detected, feedback triggers roaming teardown and return to HPLMN. This closed-loop feedback control automates the complexity of roaming management while ensuring service continuity based on real-time network conditions.
Data Source
AI summary
Embodiments of this application provide a roaming method. The method includes: A terminal device accesses a second PLMN when the terminal device cannot access a first PLMN, where a dynamic roaming agreement between the second PLMN and the first PLMN is enabled; the terminal device receives indication information from the second PLMN, where the indication information is used to indicate to disable the dynamic roaming agreement between the second PLMN and the first PLMN; and the terminal device sends an access request message to the first PLMN based on the indication information.