UE Connected Mode Transition Timing Control
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Solution Overview
Problem
The challenge in the 5G System (5GS) is to implement Enhanced Control Plane Steering of Roaming (eCPSOR_CON) effectively, specifically in managing the timing of a User Equipment (UE) transitioning from a connected mode to an idle mode, where existing methods lack a clear realization method.
Innovation Solution
A User Equipment (UE) with a transmission and/or reception unit and a controller receives Steering of roaming connected mode control information (SOR-CMCI), checks if ongoing services are exempt from release due to SOR, and configures Tsor-cm timers accordingly, setting them to 0 if not included in the updated user-controlled list and having a matching criterion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains connected mode for ongoing services when SOR list is updated, then service continuity is ensured, but the UE cannot transition to idle mode timely for roaming optimization
Solution Approach 1:
The patent implements dynamic timer management where the UE adjusts the Tsor-cm timer value based on real-time evaluation of service characteristics and SOR list updates. The timer can be set to infinity for services requiring continuous connectivity or to specific values for services that can tolerate disconnection, enabling adaptive transition timing that optimizes both service continuity and roaming efficiency
Solution Approach 2:
The patent changes the parameter state of the Tsor-cm timer from a fixed value to a dynamic configurable parameter. The UE evaluates service characteristics and SOR update conditions to determine appropriate timer values, including setting the timer to infinity for exempted services or to 0 for services matching SOR criteria, thereby resolving the contradiction between maintaining connectivity and enabling timely transition
2Measurement precision
If the UE checks all ongoing services against updated SOR list with infinite timer, then accurate roaming control is achieved, but processing complexity increases
Solution Approach 1:
The patent segments the service evaluation process by dividing ongoing services into distinct groups: services in the exempted list, services with infinite timer, and services matching SOR criteria. This segmentation allows the UE to apply different processing rules to different service categories, reducing overall processing complexity while maintaining accurate roaming control for each service type
Solution Approach 2:
The patent implements preliminary classification of services into exempted lists before SOR updates occur. By pre-identifying services that should maintain continuous connectivity and storing them in exempted lists, the UE avoids complex real-time evaluation during SOR updates, thereby reducing processing complexity while ensuring accurate roaming control
Data Source
AI summary
In a 5GS, provided is a communication unit for implementing a function related to Enhancement for the 5G Control Plane Steering of Roaming for UE in CONNECTED mode (eCPSOR_CON). In the 5GS, provided is a method and a communication unit for a procedure for a network to notify a UE of information used for control for the network to control timing at which the UE transitions from a connected mode to an idle mode for SOR. Furthermore, provided is a method for controlling the timing at which the UE transitions from the connected mode to the idle mode.