UE Slice Congestion Control for Multi-Slice Session Setup
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Solution Overview
Problem
In the 5G System (5GS), there is a lack of clear management processing for congestion control when a terminal apparatus connects to multiple network slices.
Innovation Solution
Implementing congestion control for each network slice and/or Data Network Name (DNN) or Access Point Name (APN) initiated by the User Equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal apparatus connects to multiple network slices, then network service diversity and connectivity are improved, but management processing complexity and congestion control difficulty increase
Solution Approach 1:
The patent segments congestion control management by introducing separate backoff timers for each network slice (first backoff timer for first network slice, second backoff timer for second network slice). This allows independent congestion control per slice while maintaining multi-slice connectivity, resolving the contradiction between service diversity and management complexity.
2Measurement precision
If congestion control is implemented for each network slice, then congestion management precision is improved, but system complexity and processing overhead increase
Solution Approach 1:
The patent applies local quality by implementing slice-specific congestion control parameters (separate backoff timers for each network slice) rather than uniform control. This enables precise congestion management for each slice while keeping the overall system architecture simple through standardized implementation procedures.
Data Source
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AI summary
A notification is made of information in one PDU session establishment procedure to a terminal apparatus, the information being associated with information for identifying one NW slice that is a target of congestion control and the information for identifying another NW slice associated, to prevent a PDU session establishment procedure using information for identifying multiple NW slices at a time. As a method for interpreting the information for identifying the other NW slice associated, two implementation schemes are defined that use explicit notifications from a network and rules configured for the terminal apparatus. In a case that NW slice based congestion control is applied, information for identifying the NW slice to which establishment of a PDU session is allowed is notified as an exception. In a case that the terminal apparatus notified of a DCN ID during the 5GS connection moves to the EPS after application of 5GS congestion control, connection to the DCN ID that provides the same service level as the NW slice of the target of congestion control is also prevented. This provides a communication control method for implementing a management processing such as 5G congestion control initiated by a terminal apparatus or a network.