AMF Deregistration Control for Localized Service Return Load
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Solution Overview
Problem
Existing methods for controlling overload at home networks when a high number of UEs attempt to re-register from temporary hosting networks increase waiting times due to random back-off timers, leading to inefficiencies.
Innovation Solution
Implementing adaptive deregistration of UEs from hosting networks based on input from home networks, limiting the number of returning UEs per unit time to manage network load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access control and barring techniques are used to control overload at home network, then network overload is mitigated, but waiting time for UEs increases due to random back-off timers
Solution Approach 1:
The home network AMF sends a deregistration request to the hosting network AMF before the UEs actually return to the home network. This preliminary action prepares the hosting network to control the deregistration timing, preventing simultaneous returns that cause overload, while allowing UEs to return without random back-off delays.
Solution Approach 2:
The hosting network AMF receives feedback from the home network AMF regarding the maximum number of UEs allowed to return per unit time. This feedback mechanism enables the hosting network to adjust deregistration timing to match home network capacity, resolving the contradiction between overload control and waiting time reduction.
2Ease of operation
If a high number of UEs return from temporary local access to home network simultaneously, then UEs can access their home network services, but control plane overload occurs at home network
Solution Approach 1:
The home network AMF initiates a deregistration request to the hosting network before UEs return, allowing the hosting network to schedule deregistrations in advance. This prevents simultaneous returns that would overwhelm the control plane, while ensuring UEs can eventually access home network services without excessive delays.
Solution Approach 2:
The hosting network AMF acts as an intermediary between UEs and the home network AMF. It receives the maximum UE return rate from the home network and controls the timing of deregistrations, thereby mediating between UE access needs and home network control plane capacity limitations.
3Reliability
If random back-off timer values are assigned to UEs to manage overload, then home network overload is controlled, but productivity decreases due to increased waiting time
Solution Approach 1:
The home network AMF provides feedback to the hosting network AMF about the maximum number of UEs that can return per unit time. This feedback enables deterministic scheduling of deregistrations based on actual home network capacity, replacing random back-off timers and improving re-registration efficiency while maintaining overload control.
Solution Approach 2:
The system changes from using random back-off timer values to using deterministic timing parameters based on the maximum UE return rate. This parameter change allows UEs to return at controlled intervals that match home network processing capacity, improving productivity without sacrificing overload control reliability.
Data Source
AI summary
An aspect of this disclosure includes a method of an Access and Mobility Management Function (AMF) in a network that provides access to a localized service. The method includes: performing registration with a plurality of User Equipments (UEs) for the localized service; and controlling a deregistration of part of the plurality of UEs, in a case where the localized service is ended.