Adaptive Back-Off Timers for 5G Network Slice Admission
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Solution Overview
Problem
Existing 5G network slicing systems face a signaling storm due to all UEs receiving the same implementation-specific back-off timer after network slice admission control rejections, leading to simultaneous connection attempts and increased network load.
Innovation Solution
A method and system that provide different back-off timer values to UEs based on network slice availability and analytics, allowing for tailored rejection periods to manage network load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all UEs receive the same back-off timer value after network slice admission control rejection, then the implementation is simple and consistent, but this leads to signaling storms due to simultaneous connection attempts and increases network load
Solution Approach 1:
The patent applies local quality by providing different back-off timer values to different UEs based on their specific characteristics, network slice availability, and current network conditions. Instead of a uniform back-off timer, each UE receives a tailored timer value that considers local factors such as UE category, service type, and network slice quota status, thereby distributing connection attempts non-uniformly to prevent signaling storms
Solution Approach 2:
The patent implements dynamics by making the back-off timer value variable and adaptive rather than static. The network function dynamically determines back-off timer values based on real-time network slice admission control status, available quotas, and network conditions. This dynamic adjustment allows the system to respond to changing network states and prevent synchronized reconnection attempts
Solution Approach 3:
The patent changes the parameter of back-off timer from a fixed implementation-specific value to a variable parameter that can take different values based on network conditions, UE characteristics, and slice availability. By introducing parameter variation, the system transforms the back-off mechanism from a rigid uniform approach to a flexible adaptive approach that prevents signaling storms
2Object-generated harmful factors
If the network provides differentiated back-off timer values to UEs based on network slice availability and analytics, then signaling storms are reduced and network resources are optimized, but the system complexity increases
Solution Approach 1:
The patent introduces an intermediary network function (AMF or SMF) that acts as a mediator between the NSACF and UEs. This intermediary receives analytics data, determines appropriate back-off timer values, and communicates them to UEs. The intermediary simplifies the overall system architecture by centralizing the decision-making logic and avoiding the need for direct complex interactions between multiple network functions and UEs
Solution Approach 2:
The patent implements feedback mechanisms where the network function continuously monitors network slice admission control status, receives analytics data about network conditions, and adjusts back-off timer values accordingly. This feedback loop enables adaptive back-off timer management that responds to changing network states, optimizing resource utilization while preventing signaling storms
Data Source
AI summary
The present disclosure relates to the field of network slicing in wireless communication. In accordance with an aspect of the disclosure, a method performed by an access and mobility function (AMF) entity is provided. The method includes receiving, from a user equipment (UE), a registration request including a requested network slice selection assistance information (NSSAI); transmitting, to a Network Slice Admission Control Function (NSACF) entity, a request for determination of an availability of a number of UEs based on the registration request; and in case that a rejection for the request is received from the NSACF, transmitting, to the UE, information on a back-off timer.