S-NSSAI Back-Off Timer Association for 5G Inter-PLMN Congestion
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Solution Overview
Problem
The existing S-NSSAI-based congestion control mechanism in 5G networks is ineffective when the UE moves to a different PLMN, as it fails to associate the back-off timer with the appropriate S-NSSAI value, leading to incorrect congestion control.
Innovation Solution
The proposed solution involves updating the S-NSSAI value when the UE moves to a different PLMN and associating the back-off timer with the updated S-NSSAI value, ensuring correct congestion control by forbidding transmissions when the S-NSSAI of the request message matches the S-NSSAI associated with the back-off timer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the S-NSSAI based back-off timer is always associated with the S-NSSAI provided by the UE during PDU session establishment, then the congestion control mechanism is simple to implement, but it becomes incorrect when inter-PLMN change occurs and the S-NSSAI value is updated
Solution Approach 1:
The patent makes the back-off timer association dynamic by enabling the UE to update the S-NSSAI value associated with the back-off timer when inter-PLMN change occurs. Instead of statically associating the timer with the initial S-NSSAI, the system dynamically updates the association to reflect the current S-NSSAI value, ensuring congestion control accuracy while maintaining implementation feasibility through conditional update logic.
2Reliability
If the S-NSSAI value is updated during inter-PLMN change, then the congestion control accuracy is improved, but the complexity of the congestion control mechanism increases
Solution Approach 1:
The patent changes the S-NSSAI parameter associated with the back-off timer based on inter-PLMN change events. When the UE detects an inter-PLMN change, it updates the S-NSSAI value parameter that the back-off timer references, allowing the system to adapt to new network conditions while keeping the overall mechanism relatively simple through parameter substitution rather than structural complexity.
3Ease of manufacture
If the back-off timer is not associated with the appropriate S-NSSAI during inter-PLMN change, then the implementation remains simple, but the network performance deteriorates due to incorrect congestion control
Solution Approach 1:
The patent performs preliminary action by having the UE proactively update the S-NSSAI association with the back-off timer before congestion control decisions are made. When inter-PLMN change occurs, the UE预先 updates the S-NSSAI value that the back-off timer references, ensuring that subsequent congestion control operations use the correct S-NSSAI value and maintain optimal network performance.
Data Source
AI summary
Various solutions for single network slice selection assistance information (S-NSSAI) based congestion control with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a message with a back-off timer from the network node. The apparatus may determine whether an S-NSSAI of a protocol data unit (PDU) session is provided by the network node. The apparatus may start the back-off timer and associate the back-off timer with the S-NSSAI of the PDU session in an event that the S-NSSAI is provided by the network node.