User Equipment Deregistration via Non-3GPP Access
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Solution Overview
Problem
Existing methods for deregistering user equipment in 5G networks require additional procedures, particularly when transitioning from an idle state in the 3GPP access network to a connected state in the non-3GPP access network, leading to signaling delays and inefficient use of radio resources.
Innovation Solution
A method that allows user equipment to directly initiate a deregistration procedure through the non-3GPP access network without changing the 3GPP access network state, by determining the connection management state in both 3GPP and non-3GPP networks and transmitting a deregistration request message to the access and mobility management function, thereby bypassing the need for additional procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment follows the existing deregistration method through the 3GPP access network, then the deregistration can be completed, but additional procedures are required to change the 3GPP access network to CM_CONNECTED state before deregistration when in CM_IDLE state, leading to signaling delays and inefficient radio resource usage
Solution Approach 1:
The patent introduces the non-3GPP access network as an intermediary path for deregistration. When the UE is in CM_IDLE state in the 3GPP access network, it can initiate deregistration through the non-3GPP access network (which maintains CM_CONNECTED state), thereby bypassing the need to transition through CM_CONNECTED state in the 3GPP network and eliminating the associated signaling delays.
2Reliability
If the user equipment follows the existing deregistration method through the 3GPP access network, then the deregistration can be completed, but additional procedures are required, leading to inefficient use of radio resources
Solution Approach 1:
The non-3GPP access network serves as an intermediary that allows deregistration to proceed without requiring the UE to activate radio resources in the 3GPP network. By maintaining CM_CONNECTED state in the non-3GPP network, the UE can perform deregistration without the energy-consuming state transitions and additional signaling required in the 3GPP network.
3Productivity
If the user equipment initiates deregistration directly through the non-3GPP access network in CM_CONNECTED state, then signaling delays are prevented and radio resources are efficiently used, but the procedure requires determining connection management state in multiple networks
Solution Approach 1:
The UE autonomously determines its own connection management state in both 3GPP and non-3GPP access networks and selects the appropriate deregistration path accordingly. This self-service approach allows the UE to make intelligent decisions about which network to use for deregistration based on its current state, improving efficiency while managing complexity through autonomous operation.
Data Source
AI summary
A deregistration method of user equipment in a network and user equipment performing the same is disclosed. The user equipment determines whether the user equipment is in a connection management (CM)_CONNECTED state in a non-3GPP access network and initiates a deregistration procedure through the non-3GPP access network if the user equipment is in the CM_CONNECTED state in the non-3GPP access network.