UE Registration Trigger for PLMN Change in RRC Inactive State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The issue of mismatch between user equipment (UE) and network entities regarding the selected public land mobile network (PLMN) during registration procedures in 5G communication networks, particularly in RRC inactive states, leads to failures in deregistration and authentication processes.
Innovation Solution
A method for UE to automatically trigger a registration procedure when moving from one PLMN to another within the same registration area, ensuring synchronization by sending a registration request message to the network, even in RRC inactive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE moves to a new cell in a different PLMN within the same registration area while in RRC inactive state, then the UE can camp on the new PLMN, but the network entity remains unaware of the PLMN change causing mismatch
Solution Approach 1:
The network entity proactively sends a registration request to the UE when it needs to initiate a procedure. This preliminary action allows the network to trigger a PLMN update before proceeding with procedures like deregistration or authentication, ensuring the UE provides its current PLMN information.
Solution Approach 2:
The UE responds to the network's registration request by providing feedback about its current PLMN through a registration accept message. This feedback mechanism ensures the network entity receives updated PLMN information, resolving the awareness mismatch.
2Productivity
If the network entity initiates a deregistration or authentication procedure without knowing the current PLMN, then the procedure can be initiated, but the procedure fails due to PLMN mismatch
Solution Approach 1:
Before initiating deregistration or authentication procedures, the network entity first sends a registration request to obtain current PLMN information. This preliminary action ensures the network has accurate PLMN data before proceeding with the actual procedure, preventing failures.
Solution Approach 2:
The patent prevents the harmful effect of PLMN mismatch by proactively obtaining updated PLMN information through a registration request before initiating procedures that would otherwise fail due to outdated PLMN data.
3Loss of energy
If the UE does not trigger registration procedure when moving within registration area, then signaling overhead is reduced, but PLMN synchronization is lost
Solution Approach 1:
The network entity acts as an intermediary by initiating a registration request when it needs to perform procedures. This intermediary approach allows the network to obtain updated PLMN information without requiring the UE to proactively trigger registration, balancing signaling overhead with information accuracy.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method for triggering a registration procedure by a UE within a registration area of a wireless communication network is provided. The method includes receiving a TAI list in a registration accept message while performing a first registration procedure with the wireless communication network and determining when the UE is moved from a first cell in a first TAI belonging to a first PLMN to a second cell in a second TAI belonging to a second PLMN, determining that the UE is in an RRC inactive state, and automatically triggering a second registration procedure with the wireless communication network, in response to determining that the UE is moved from first cell in first TAI belonging to first PLMN to second cell in second TAI belonging to second PLMN.