RAN-Controlled Inactive UE Context Management via Periodic Updating Timer
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Solution Overview
Problem
In cellular communications networks, inactive User Equipment (UE) contexts stored in unreliable Radio Access Network (RAN) nodes are at risk of being lost, leading to UEs becoming unreachable for incoming data or services, as current solutions either introduce excessive complexity or fail to minimize the risk of UEs ending up in an unreachable state.
Innovation Solution
Implementing a configurable periodic updating timer for UEs in RAN-controlled inactive states, where unreliable RAN nodes assign shorter timers and transfer UE contexts to more reliable nodes, allowing UEs to store and retrieve contexts efficiently, thus minimizing the risk of loss and avoiding the need for additional paging mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE contexts are stored in unreliable RAN nodes for inactive UEs, then network resources are saved and quick resume is enabled, but the risk of context loss increases making UEs unreachable
Solution Approach 1:
The system performs preliminary actions by configuring UEs with a periodic updating timer before they enter inactive state. This timer ensures that UEs periodically update their context with the RAN node, preventing context loss due to node unreliability. The preliminary configuration of the timer mechanism resolves the contradiction by proactively maintaining context validity without requiring continuous connection.
Solution Approach 2:
The periodic updating timer creates a feedback mechanism where UEs in inactive state periodically report their status back to the RAN node. This feedback loop ensures that the RAN node maintains an updated context for the UE, resolving the reliability issue while keeping the UE in inactive state for resource efficiency.
2Reliability
If additional paging mechanisms are implemented to track inactive UEs, then UE reachability is improved, but network complexity and signaling costs increase
Solution Approach 1:
The UE autonomously manages its own context updating through the periodic updating timer mechanism. Instead of requiring the network to implement complex paging and tracking mechanisms, the UE self-services by periodically updating its context with the RAN node. This eliminates the need for additional paging mechanisms while maintaining UE reachability, thus resolving the contradiction between reliability and complexity.
3Reliability
If UEs frequently update their context in inactive state, then context accuracy is maintained, but signaling overhead increases
Solution Approach 1:
The system implements periodic action through the configurable periodic updating timer, which balances context accuracy with signaling overhead. Instead of continuous or frequent updates, UEs update their context at periodic intervals determined by the timer configuration. This periodic mechanism maintains context accuracy while minimizing unnecessary signaling, resolving the contradiction between reliability and energy loss.
Data Source
AI summary
Systems and methods are disclosed herein that relate to configuration of a periodic updating timer for, e.g., a Radio Access Network (RAN)—controlled inactive state. In some embodiments, a method of operation of a RAN node in a cellular communications network comprises configuring a User Equipment (UE) with a timer value T for a periodic updating timer. In this manner, the RAN node is able to configure the UE with a time value T, e.g., for use by the UE for providing periodic update messages while the UE is operating in an inactive state such as, e.g., a RAN-controlled inactive state.