Sidelink DRX Configuration Negotiation for Power and Latency Trade-offs
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Solution Overview
Problem
Current sidelink communication technologies face challenges in efficiently configuring and managing discontinuous reception (DRX) settings for optimal power savings and quality of service (QoS) in wireless communication systems.
Innovation Solution
The proposed solution involves a method where user equipment (UEs) can exchange directional sidelink DRX configurations, including timing information, to negotiate and establish DRX settings that balance power conservation and QoS requirements for both transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs continuously monitor sidelink communications to ensure QoS, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) configurations where UEs periodically switch between active monitoring periods and sleep periods. The DRX cycle includes an on-duration during which the UE monitors sidelink communications and an off-duration for power saving, resolving the contradiction between continuous monitoring for reliability and periodic monitoring for power efficiency
Solution Approach 2:
The patent enables dynamic adjustment of DRX parameters including cycle length, on-duration, and offset values based on communication conditions. The gNB can configure different DRX parameters for different UEs and adjust them in response to traffic patterns and QoS requirements, allowing the system to adapt between reliability and power consumption needs
2Use of energy by moving object
If UEs use aggressive DRX configurations to save power, then power efficiency is improved, but communication latency increases
Solution Approach 1:
The patent changes DRX parameter values dynamically based on service requirements. For URLLC services with strict latency requirements, the system uses shorter DRX cycles or disables DRX entirely. For eMBB services with more flexible timing, longer DRX cycles are applied to maximize power efficiency while maintaining acceptable latency performance
3Reliability
If individual DRX configurations are negotiated for each UE pair to optimize QoS, then communication quality is improved, but signaling overhead increases
Solution Approach 1:
The patent segments DRX configuration management into UE-specific configurations negotiated individually between each gNB-UE pair. Each UE receives customized DRX parameters tailored to its specific QoS requirements, traffic patterns, and channel conditions, allowing optimized performance for each user while maintaining manageable signaling through efficient RRC message structures
4Adaptability or versatility
If UEs outside base station coverage autonomously configure DRX settings, then system autonomy is improved, but configuration accuracy deteriorates
Solution Approach 1:
The patent implements pre-configuration of DRX parameters by the gNB before the UE enters out-of-coverage scenarios. The gNB configures default DRX parameters and provides configuration templates that UEs can autonomously apply when out of coverage, ensuring configuration accuracy is maintained through pre-planned settings while enabling system autonomy during coverage gaps
Data Source
AI summary
A first user equipment (UE) transmits, to a second UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE. The first UE transmits, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE. The first UE receives a response from the second UE confirming or rejecting the DRX configuration.