UE Mobility Policy for 5G Congestion Handover to LTE
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Solution Overview
Problem
Existing 5G networks experience ping-pong effects between 4G and 5G networks due to network congestion, leading to inefficient UE mobility management.
Innovation Solution
Implementing a system and method for mobility management that includes receiving an access management policy with a radio frequency selection priority index, modifying it based on congestion notifications, and managing UE handovers between 5G and 4G networks to alleviate congestion by directing UEs to less congested LTE cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs are managed to move between 4G and 5G networks based on congestion levels, then network efficiency and service quality are improved, but system complexity increases due to additional mobility management mechanisms
Solution Approach 1:
The system performs preliminary actions by proactively identifying congested gNBs and modifying RFSP indexes before severe congestion occurs. The PCF receives congestion notifications and preemptively adjusts UE mobility policies by modifying RFSP indexes to redirect UEs away from congested areas, preventing service degradation rather than reacting to it.
Solution Approach 2:
The system implements dynamic mobility management by continuously monitoring congestion levels and adjusting RFSP indexes in real-time. The AMF dynamically modifies UE context with updated RFSP indexes based on current network conditions, enabling flexible and adaptive UE redistribution between 4G and 5G networks according to changing congestion patterns.
2Reliability
If RFSP indexes are modified to redirect UEs from congested gNBs, then congestion is alleviated and service quality improves, but ping-pong effects may occur causing inefficient mobility management
Solution Approach 1:
The system applies preliminary action by setting RFSP expiry times that prevent premature handovers. The modified RFSP indexes include validity periods during which UEs must maintain their current serving cell, preventing rapid back-and-forth movements. This preliminary time constraint ensures that RFSP modifications take effect stabilly before allowing further mobility adjustments.
Solution Approach 2:
The system implements feedback mechanisms where the AMF monitors UE mobility patterns and congestion levels continuously. When ping-pong effects are detected or congestion patterns change, the PCF receives updated notifications and adjusts RFSP indexes accordingly, creating a closed-loop control system that adapts to actual network conditions and prevents inefficient mobility cycles.
3Productivity
If congestion notifications are implemented to trigger UE relocation, then network load balancing improves, but signaling overhead increases between network functions
Solution Approach 1:
The congestion notification mechanism serves multiple functions simultaneously: it triggers RFSP index modification for UE redistribution, provides load information for capacity planning, and enables proactive congestion prevention. This multi-functionality reduces the need for separate signaling mechanisms for different network management tasks, optimizing signaling efficiency despite the increased message volume.
Data Source
AI summary
The present technology involves system, methods, and computer-readable media for establishing mobility of user equipment (UEs) or mobile from congested new radio (NR) cells to un-congested Long-Term Evolution (LTE) cells. For operators that deploy both LTE cells and NR cells, the UEs can move from congested NR cells to un-congested LTE cells but can also be handed back into un-congested NR cells.