Skipping IMS Registration for Multi-Homing PSA Addition
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Solution Overview
Problem
In 5G mobile communication systems, the process of assigning a new IP address to user equipment (UE) for multi-homing-based protocol data unit session anchor (PSA) addition leads to unnecessary IP multimedia subsystem (IMS) registration procedures, which are inefficient and resource-intensive.
Innovation Solution
A method and apparatus for UE to skip IMS registration using a new IP address received from a session management function (SMF) when it is related to multi-homing-based PSA addition, allowing the new IP address to be used for IMS media routing to an added second PSA, with the non-access stratum (NAS) layer providing information to upper layers indicating the IP address is for IMS media routing only.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs IMS registration using a new IP address assigned for multi-homing-based PSA addition, then the UE can establish proper routing for IMS services, but the registration procedure becomes unnecessary and resource-intensive
Solution Approach 1:
The patent extracts the IMS registration step from the standard IP address assignment procedure. By introducing a new parameter `skipIMSRegistration` in the PDU Session Modification Confirm message, the system selectively removes the registration requirement when multi-homing-based PSA addition is detected, allowing the UE to skip unnecessary registration while maintaining proper routing through the new IP address for IMS media only
Solution Approach 2:
The patent applies different treatment to different uses of the new IP address. The IP address is used for IMS media routing when multi-homing is detected, but not for IMS registration. This localized differentiation of functionality is achieved through the `skipIMSRegistration` parameter that modifies the standard registration behavior specifically for multi-homing scenarios
2Productivity
If the UE skips IMS registration when receiving a new IP address for multi-homing-based PSA addition, then resource usage is optimized and efficiency is improved, but the UE must correctly identify when registration should be skipped
Solution Approach 1:
The patent implements feedback from the network to the UE through the PDU Session Modification Confirm message containing the `skipIMSRegistration` parameter. This feedback mechanism explicitly informs the UE whether to skip IMS registration based on the session modification type, eliminating the need for the UE to independently identify and interpret complex IP address characteristics
Solution Approach 2:
The `skipIMSRegistration` parameter acts as an intermediary signal between the network and UE. Instead of requiring the UE to analyze IP address properties or session configurations to determine registration requirements, the parameter serves as a direct intermediary instruction that simplifies the UE's decision-making process
Data Source
AI summary
An embodiment of the present invention relates to a method for transceiving a signal, by a user equipment (UE), in association with multi-homing based PSA addition in a wireless communication system, the method comprising the steps of: establishing a protocol data unit (PDU) session with a first protocol data unit session anchor (PSA); and receiving a new IP address from a session management function (SMF), wherein when the received new IP address is associated with multi-homing based PSA addition, the UE skips performing IMS registration using the new IP address.