UE Purge Accuracy via Node Type Identification
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Solution Overview
Problem
The existing user equipment (UE) purge process in EPS networks can incorrectly purge the registration state of UE in MME or SGSN when integrated nodes have the same address, leading to wrongful purging.
Innovation Solution
A method and system where a combined node initiates a purge flow to the HSS only when the registration state of all mobility management network elements is unregistered and inconsistent with the stored state, ensuring accurate purging by checking and managing purge marks in MME and SGSN nodes separately or jointly based on their addresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HSS uses source address matching to identify purge requests, then the purge process is simple and efficient, but wrongful purging occurs when MME and SGSN have the same address
Solution Approach 1:
The patent segments the address matching process by introducing a node type identifier that distinguishes between MME and SGSN nodes. Instead of relying solely on source address matching, the system now matches both the source address and the node type, effectively dividing the identification space to avoid collisions between nodes with identical addresses but different functions.
Solution Approach 2:
The patent introduces a node type identifier as an intermediary element in the purge request message. This intermediary carries additional information that disambiguates the source of the purge request, allowing the HSS to correctly identify whether the request comes from an MME or SGSN even when their addresses are identical.
2Measurement precision
If the HSS stores addresses of MME and SGSN separately, then accurate identification is possible, but the complexity of address management increases
Solution Approach 1:
The patent creates a universal address management approach where the HSS stores a unified set of addresses without distinguishing between MME and SGSN addresses. The node type identifier in purge requests provides the necessary differentiation, allowing the same storage mechanism to handle both node types uniformly while maintaining accurate identification.
3Adaptability or versatility
If integrated nodes MME and SGSN use the same address, then resource utilization is improved, but purge requests cannot be correctly routed
Solution Approach 1:
The patent applies preliminary action by including the node type identifier in the purge request message before the HSS needs to route the request. This pre-included information allows the HSS to immediately determine the correct routing destination without needing to maintain separate address books or perform complex lookup operations.
Data Source
AI summary
The present disclosure relates a method and system for accomplishing a UE purge. The method comprises: a combined node initiates a purge flow of the UE to a HSS to which the UE is attached when determining that a registration state of the UE in all mobility management network elements of the combined node is unregistered and the registration state is not consistent with a registration state of the UE stored in the HSS; wherein the combined node comprises one or more mobility management network elements. The method and system for accomplishing user equipment purge provided by the present disclosure are simple and convenient to implement and effectively solve the technical problem in the prior art.