UE Network Selection Mode Switching for Tsor-cm Timer Control
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Solution Overview
Problem
The 3GPP has not provided a clear method for supporting Enhanced Control Plane Steering of Roaming (eCPSOR) in the 5G System (5GS), specifically for controlling the timing of a User Equipment (UE) transitioning from a connected mode to an idle mode.
Innovation Solution
A User Equipment (UE) with a controller that switches to manual network selection mode and stops the Tsor-cm timer when it is running, enabling automatic network selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the UE operates in automatic network selection mode with the Tsor-cm timer running, then the UE can automatically transition from connected mode to idle mode according to the timer, but the network cannot control the timing of this transition
Solution Approach 1:
The system dynamically switches between automatic and manual network selection modes based on network conditions and requirements. The network can control the UE to switch from automatic mode (where Tsor-cm timer operates autonomously) to manual mode (where network retains control), thereby achieving flexible adaptability between automation and controllability
Solution Approach 2:
The network controls the UE by changing the network selection mode parameter from automatic to manual, and by controlling the starting time parameter of the Tsor-cm timer. This allows the network to dictate exactly when the timer starts and when transitions occur, maintaining full control over the timing while still utilizing the automated timer mechanism
2Ease of operation
If the network wants to control the timing of UE transition from connected to idle mode, then the network can set the starting time of the Tsor-cm timer, but the UE must switch from automatic to manual network selection mode
Solution Approach 1:
The system employs dynamic mode switching between automatic and manual network selection. The UE adapts its operation mode based on network control requirements, transitioning from fully automatic operation to manual operation when network control is needed, and vice versa. This dynamic adaptation resolves the contradiction between automation and controllability
Solution Approach 2:
The network performs preliminary action by configuring the UE with specific network selection mode and timer starting time before the actual transition occurs. By pre-setting these parameters, the network ensures that the UE will transition at the desired time while maintaining the appearance of automated operation
3Ease of operation
If the Tsor-cm timer is running in automatic network selection mode, then the UE transitions automatically, but switching to manual mode requires stopping the timer
Solution Approach 1:
The system performs preliminary action by pre-configuring the network selection mode and timer starting time parameters. The network determines in advance when to switch modes and when to start the timer, eliminating the need for reactive timer management and reducing time loss associated with mode switching
Solution Approach 2:
The network acts as an intermediary that coordinates between the automatic timer mechanism and manual control requirements. By managing the mode switching and timer starting time, the network mediates between automated operation and manual control, ensuring seamless transitions without time loss
Data Source
AI summary
A User Equipment (UE) includes a controller. The controller is in automatic network selection mode, and the controller stops a Tsor-cm timer in a case that the controller switched to manual network selection mode and the Tsor-cm timer is running.