AMF Network-Initiated Deregistration for Subscription Withdrawal
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Solution Overview
Problem
Current mobile communication systems face challenges in managing resource allocation and deregistration procedures efficiently, particularly with the increasing demand for higher data transmission rates and the need for flexible access management in next-generation networks.
Innovation Solution
A network-initiated deregistration method is introduced, where the Access and Mobility Management Function (AMF) receives a message indicating subscription withdrawal from the Unified Data Management (UDM) and initiates a deregistration request to User Equipment (UE), allowing for the deregistration of all registered accesses, including 3GPP and non-3GPP accesses, with specific access types and signaling connections being released accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network initiates deregistration for all accesses when subscription is withdrawn, then resource management efficiency is improved, but the complexity of deregistration procedure increases
Solution Approach 1:
The deregistration procedure is segmented into distinct message types (deregistration request, deregistration accept, deregistration reject) with specific cause values. The AMF segments the deregistration scope by indicating target access types (3GPP, non-3GPP, or all accesses) in the deregistration request message, allowing controlled complexity while maintaining efficiency.
Solution Approach 2:
The UDM performs preliminary action by notifying the AMF of subscription withdrawal before the actual deregistration occurs. This advance notification allows the AMF to prepare and initiate the deregistration procedure systematically, improving resource management efficiency while following a structured process that manages complexity.
2Measurement precision
If access type information is explicitly signaled in deregistration request, then precision of target access identification is improved, but message complexity increases
Solution Approach 1:
The access type information is added as a localized field within the deregistration request message structure. This field provides precise identification of target access types (3GPP, non-3GPP, or all) without redesigning the entire message structure, thereby improving identification precision while minimizing message complexity increase.
Solution Approach 2:
The message includes access type information that may be more detailed than always necessary. When full precision is needed (e.g., when targeting specific access types), the field provides complete information. When not needed, the system can use default values, allowing partial action that balances precision with simplicity.
Data Source
AI summary
Disclosed herein is a network-initiated deregistration method by an access and mobility management function (AMF) in a wireless communication system, including: receiving a first message having a removal reason configured to subscription withdrawn from a unified data management (UDM); and transmitting a deregistration request message for requesting the deregistration to a user equipment (UE), in which the deregistration is enabled to be performed for all accesses in which the UE is registered when the removal cause received from the UDM through the first message indicates the subscription withdrawn of the UE.