FPLMN Handling in Disaster Roaming for Seamless PLMN Reselection
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Solution Overview
Problem
Current methods do not effectively manage the selection of Forbidden Public Land Mobile Networks (FPLMNs) during disaster situations, leading to unnecessary resource wastage and repeated registration attempts by User Equipment (UE) on forbidden networks, which results in service interruption minimization inefficiencies.
Innovation Solution
The proposed solution involves removing FPLMNs from the list, triggering a deregistration procedure, and performing a selection of available PLMN networks, along with managing S1 mode support to facilitate seamless transitions from disaster roaming to normal services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE repeatedly attempts registration on FPLMN during disaster situations, then service availability may be improved, but network resources are wasted and service interruption increases
Solution Approach 1:
The network performs preliminary actions by sending Steering of Roaming (SOR) information to the UE before the UE attempts registration on FPLMN. This SOR information proactively indicates which PLMNs are forbidden and which are recommended, preventing the UE from wasting resources on repeated registration attempts to FPLMN while ensuring service availability through guided roaming to appropriate networks.
2Adaptability or versatility
If UE follows traditional PLMN selection procedures during disaster, then network compatibility is maintained, but service interruption time increases
Solution Approach 1:
The network sends SOR information in advance containing pre-evaluated PLMN recommendations and forbidden PLMN lists based on disaster conditions. This preliminary action allows the UE to skip traditional trial-and-error PLMN selection procedures, directly selecting recommended PLMNs while maintaining network compatibility through standardized SOR message formats and selection algorithms.
Solution Approach 2:
The system implements feedback mechanisms where the network continuously monitors disaster conditions and updates SOR information to the UE. This feedback loop ensures the UE receives current PLMN recommendations and forbidden list updates, enabling dynamic adaptation to changing disaster conditions while maintaining compatibility with network policies and reducing service interruption through informed selection decisions.
3Reliability
If UE maintains FPLMN list during disaster roaming, then network security is preserved, but transition to normal service becomes inefficient
Solution Approach 1:
The FPLMN list is implemented as a dynamic parameter that can be updated through SOR information rather than a static configuration. During disaster situations, the network can add PLMNs to the forbidden list via SOR messages. When disasters subside, the network can remove PLMNs from the forbidden list through updated SOR information, enabling efficient transition to normal service while maintaining security through controlled, network-managed updates to the forbidden list.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein disclose methods and systems for handling FPLMNs for MINT. Embodiments herein disclose methods and systems for managing selection of PLMNs in wireless communication networks, during a disaster situation. Embodiments herein disclose methods and systems for managing selection of PLMNs in wireless communication networks, during a disaster situation, wherein the UE transitions from Disaster Roaming Service to Normal Service on the same PLMN-A, when PLMN-A is included in the list of preferred PLMN/access technology combinations provided in the Steering of Roaming (SOR) information to the UE. Embodiments herein disclose methods and systems for managing selection of PLMNs in wireless communication networks, during a disaster situation, wherein the UE can avail disaster roaming services from PLMN-A for other PLMN(s) with disaster condition (for e.g., PLMN-D2) when the UE was initially registered on PLMN-A for disaster roaming services for PLMN-D (which has faced disaster situation).