SRNS Relocation Fast Dormancy Detection for UE Battery Life
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Solution Overview
Problem
Wireless mobile devices face battery drain due to inability to efficiently transition to dormant or idle states during network relocation, especially when the target Radio Network Controller (RNC) does not support the fast dormancy feature, leading to synchronization issues and reduced battery life.
Innovation Solution
A method and apparatus that determine whether the target RNC supports the fast dormancy feature upon relocation, allowing the user equipment (UE) to enter a dormant, power-saving, or idle state only if the feature is supported, thereby optimizing battery life by avoiding synchronization issues and reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters a dormant state during SRNS relocation to save battery life, then power consumption is reduced, but network synchronization issues occur when the target RNC does not support fast dormancy
Solution Approach 1:
The UE determines whether the target RNC supports fast dormancy before entering dormant state. This preliminary check prevents synchronization issues by ensuring the UE only enters dormant state when the target RNC can properly handle the transition, thus resolving the contradiction between battery saving and network synchronization reliability
Solution Approach 2:
The system uses feedback from the target RNC's capability indication to control UE behavior. The UE receives information about fast dormancy support from the target RNC and adjusts its state transition accordingly, creating a closed-loop control that balances power consumption with network synchronization requirements
2Use of energy by moving object
If the UE enters dormant state without checking target RNC support, then battery life is extended, but synchronization issues and unnecessary power consumption occur
Solution Approach 1:
The capability check is performed as a preliminary step during the relocation procedure, integrating seamlessly into the existing workflow. This approach extends battery life through intelligent dormant state management while adding minimal complexity to the overall relocation process
Solution Approach 2:
The UE autonomously determines whether to enter dormant state based on target RNC capability information. This self-service approach allows the UE to optimize its own power consumption without requiring complex network-controlled decisions, thereby extending battery life with minimal additional system complexity
Data Source
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AI summary
A system and method enable wireless user equipment (UE) to undergo a serving radio network subsystem (SRNS) relocation to a radio network controller (RNC) that does not support a fast dormancy feature while maintaining synchronization with the packet-switched domain of the core network. The UE is made aware of whether the target RNC supports the fast dormancy feature by way of an indication provided to the UE in a reconfiguration message provided by the source RNC, that is, the RNC to which the UE was connected prior to the SRNS relocation. In this way, the UE can behave accordingly whether or not the target RNC supports the fast dormancy feature.