5G Core Network and UE Anchor Relocation for Congested Slices
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Solution Overview
Problem
Existing 5G systems lack effective methods for continuing PDU sessions in network slices that are congested or do not meet service level agreements (SLAs), especially in cases of mobility or non-mobility scenarios.
Innovation Solution
User Equipment (UE) supports anchor relocation with Single Network Slice Selection Assistance Information (S-NSSAI) changes by transmitting specific messages during registration and PDU session establishment/modification procedures, allowing for seamless transition to new PDU sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network slice is congested or does not meet SLAs, then service quality deteriorates, but the patent enables continuous service by establishing new PDU sessions
Solution Approach 1:
The patent segments the network slice into multiple PDU sessions. When a network slice becomes congested or fails to meet SLAs, the system can establish new PDU sessions within the same slice, effectively dividing the traffic flow into separate channels to maintain service continuity without requiring the entire slice to be free.
Solution Approach 2:
The patent introduces dynamic PDU session management where the network can establish, modify, and release PDU sessions based on real-time congestion conditions and SLA requirements. This dynamic approach allows the system to adapt to changing network conditions and maintain service quality through flexible session management.
2Reliability
If anchor relocation with S-NSSAI change is implemented, then service continuity in congested networks is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by having the UE indicate support for anchor relocation with S-NSSAI change during the registration procedure. This advance indication allows the network to prepare and manage the complexity of anchor relocation procedures, reducing the burden on the UE during actual service disruption scenarios.
Solution Approach 2:
The patent uses the AMF (Access and Mobility Management Function) as an intermediary to manage the complex anchor relocation procedures. The AMF handles the coordination between the UE and the network for PDU session establishment and modification, abstracting the complexity from the UE while enabling service continuity.
3Adaptability or versatility
If multiple PDU sessions are established for the same S-NSSAI, then service availability is improved, but network management complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors the status of PDU sessions and provides feedback for session modification or release. This feedback loop enables the network to dynamically adjust multiple PDU sessions based on real-time conditions, managing complexity through automated decision-making rather than manual intervention.
Solution Approach 2:
The patent makes the PDU session management system universal by enabling the same procedures and protocols to handle both single-session and multi-session scenarios. The network can manage multiple PDU sessions using the same standardized procedures, reducing the need for separate management mechanisms and thereby controlling complexity while maintaining service availability.
Data Source
AI summary
In the 5GS, provided is a communication unit for continuing services of a PDU session in a network slice in a case that the network slice is congested, a case that network performance of the network slice does not satisfy an SLA, or the like. The UE transmits a registration request message including UE capability information indicating that the UE supports anchor relocation with change of S-NSSAI or a network slice, in a registration procedure, establishes a first PDU session, receives a PDU session release command message including a first S-NSSAI and a first PDU session ID, releases the first PDU session, transmits the first S-NSSAI and a PDU session establishment request message including a second PDU session ID, and establishes a second PDU session.