Coordinating PC5 and Uu DRX Schedules for 5G V2X Power Efficiency
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Solution Overview
Problem
Current PC5 DRX configuration processes in 5G networks lack efficient power management, particularly for pedestrian UEs with limited battery capacity, leading to potential delays and reduced reliability in V2X communications due to uncoordinated DRX mechanisms and varying QoS requirements across different services.
Innovation Solution
A method is introduced to coordinate PC5 DRX and Uu DRX parameters by moving the UE's paging occasion, involving assistance information from the network and application layers to adapt DRX cycles, ensuring aligned power-saving modes across multiple communication links and services, thereby enhancing power efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PC5 DRX and Uu DRX operate independently with uncoordinated parameters, then device complexity is reduced and operation is simpler, but power efficiency deteriorates and communication reliability decreases
Solution Approach 1:
The patent merges PC5 DRX and Uu DRX operations by coordinating their parameters through network assistance information. The network provides unified DRX configuration that aligns both interfaces, eliminating independent operation and achieving power efficiency through coordinated scheduling of paging occasions and DRX cycles.
Solution Approach 2:
The network acts as an intermediary by providing assistance information that coordinates PC5 and Uu DRX parameters. This intermediary mechanism enables the UE to align both interfaces without complex self-coordination logic, resolving the contradiction between simplicity and power efficiency.
2Reliability
If DRX cycles are shortened to improve responsiveness and reliability, then communication reliability improves, but power consumption increases
Solution Approach 1:
The patent implements dynamic DRX cycle adjustment where the network provides assistance information that adapts DRX parameters based on service requirements and channel conditions. This allows the system to use longer DRX cycles for power saving when reliability requirements are met, and shorter cycles when responsiveness is needed, optimizing the trade-off dynamically.
Solution Approach 2:
The network changes DRX parameters (cycle length, paging occasion timing) based on service type and QoS requirements. By providing assistance information with optimized parameter sets, the system achieves reliable communication while minimizing power consumption through appropriate parameter selection rather than fixed short cycles.
3Use of energy by moving object
If paging occasion is moved to coordinate with PC5 DRX, then power efficiency improves, but network coordination complexity increases
Solution Approach 1:
The network uses assistance information as an intermediary mechanism to coordinate paging occasion movement. Rather than complex direct control, the network provides configured parameters that the UE applies autonomously, achieving power efficiency through coordinated paging while keeping network coordination complexity manageable through standardized information exchange.
Data Source
AI summary
Methods, apparatus, and systems are described for improved discontinuous reception (DRX) for PCS communication (e.g., including unicast, groupcast and broadcast) for a User Equipment (UE) and particularly for reducing the power consumption.