ISR Activation Logic Using Mobile Reachable Timer States
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Solution Overview
Problem
Inconsistencies between the ISR state at the User Equipment (UE) and the network side lead to delays and unnecessary signalling overhead during area updates, as the network struggles to maintain accurate context information and manage timers effectively, resulting in rejected requests and wasted resources.
Innovation Solution
A method and network-side device that optimize ISR activation/deactivation by deciding based on the operation states of mobile reachable and implicit detach timers, ensuring consistent ISR processes across the network and UE sides, and restarting implicit detach timers to maintain accurate context information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network side maintains context information and activates ISR based on timer operations, then idle state signalling is reduced, but inconsistencies between UE and network side ISR states occur causing delays and rejected requests
Solution Approach 1:
The network side determines ISR activation by checking timer operation states (mobile reachable timer and implicit detach timer) and provides feedback to the UE through TAU/RAU accept messages. The UE mirrors this logic locally, ensuring both sides have consistent ISR state decisions based on the same timer conditions.
Solution Approach 2:
The network side performs preliminary timer operations (starting mobile reachable timer upon UE idle transition, starting implicit detach timer when mobile reachable timer expires) and uses these timer states to preemptively determine ISR activation before area update procedures occur, preventing state inconsistencies.
2Loss of energy
If the network side activates ISR without checking timer states, then signalling overhead is reduced, but context information accuracy deteriorates leading to wasted resources
Solution Approach 1:
The invention changes the parameter used for ISR activation decision from a simple boolean flag to a timer operation state parameter. The network side checks whether mobile reachable timer and implicit detach timer are running/expired to dynamically determine ISR activation, ensuring context information remains accurate while minimizing signalling overhead.
3Reliability
If the UE mirrors network side timer logic locally, then ISR state consistency is improved, but device complexity increases
Solution Approach 1:
The UE implements universal timer management logic that mirrors the network side's timer operations. The same timer logic (mobile reachable timer, implicit detach timer) is executed on both network and UE sides, allowing the UE to autonomously determine ISR state consistency without requiring complex additional protocols or messages.
Data Source
AI summary
The present application relates to mobile communication technical field, and a method for optimizing activation/deactivation Idle State signaling Reduction (ISR) and a network side device are disclosed. The method includes: during a process of updating User Element (UE) area, a first network entity, when receiving a context request message transmitted from a second entity, determines to activate or deactivate ISR, according to a mobile-reachable timer or an implicit detach timer corresponding to said UE, or operation states of the mobile-reachable timer and the implicit detach timer; and the first network entity transmits the determination result to the second network entity, said second network entity determines to instruct the UE to activate or deactivate the ISR according to the received determination result. The application optimizes the existing procedure for the activating/deactivating of the ISR, enables the ISR processing at the network side and the UE side to be consistent in height, and thus avoiding unnecessary signaling expense.