eDRX Parameter Coordination for Inactive UE Paging Delay
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Solution Overview
Problem
Existing power-saving mechanisms in NB IOT, such as eDRX, struggle to balance low power consumption with time delay, particularly in inactive states where UE needs to monitor paging channels, and the existing negotiation mechanisms are not applicable for radio access network paging.
Innovation Solution
A method for determining extended discontinuous reception (eDRX) parameters is provided, allowing a first base station, user equipment, and a core network to negotiate and determine target eDRX parameters using suggested parameters and determination rules, ensuring consistent eDRX operation across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the eDRX cycle is extended to reduce power consumption, then power saving is improved, but time delay increases
Solution Approach 1:
The patent implements dynamic eDRX parameter adjustment by allowing the network to configure different eDRX cycle values based on UE behavior patterns, service requirements, and network conditions. The UE transitions between different eDRX configurations adaptively, optimizing the balance between power consumption and response time delay according to actual operational needs.
Solution Approach 2:
The patent changes the eDRX parameter values dynamically based on network conditions and UE state. Different eDRX cycle parameters are configured for different scenarios (e.g., short cycle for urgent communications, long cycle for power-saving mode), allowing the system to adjust the trade-off between power consumption and time delay by selecting appropriate parameter sets.
2Loss of time
If the UE monitors paging channel frequently to reduce time delay, then time delay is reduced, but power consumption increases
Solution Approach 1:
The patent implements periodic paging monitoring with variable periods. Instead of continuous monitoring, the UE monitors the paging channel at periodic intervals defined by the eDRX cycle. The period is dynamically adjusted based on service requirements and network conditions, allowing infrequent monitoring for power saving while ensuring timely detection when needed.
3Device complexity
If eDRX parameters are not coordinated during base station handover, then device complexity is reduced, but reliability of paging deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the serving base station provides eDRX parameter information to target base stations during handover preparation. The target base station receives and stores this information, ensuring consistent eDRX parameter application after handover. This feedback loop maintains paging reliability without requiring complex coordination protocols.
Solution Approach 2:
The patent uses the handover signaling messages as intermediaries to transfer eDRX parameter information from the source base station to the target base station. These signaling messages serve as the medium for parameter coordination, simplifying the handover process while ensuring paging reliability is maintained across base station transitions.
Data Source
AI summary
A method for determining an extended discontinuous reception (eDRX) parameter is performed by a first base station, and includes: determining a first target eDRX parameter in an access network for a user equipment (UE) being in an inactive state based on at least one of a first eDRX parameter determined by the first base station or a second eDRX parameter determined by a core network.