Sidelink DRX Resource Timing for Power-Saving UE Communication
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing resource allocation and power consumption in sidelink communications, particularly in scenarios involving discontinuous reception (DRX) configurations, leading to potential timer mismanagement and resource collisions.
Innovation Solution
A wireless device determines active time for sidelink communication by considering resource indications from SCI, DRX cycles, and feedback mechanisms to select and manage transmission resources, ensuring proper timer handling and resource selection based on destination activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices transmit sidelink communications continuously without considering destination active time, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements Discontinuous Reception (DRX) cycles where the destination wireless device periodically enters active time to monitor for communications, then enters sleep mode. The source device aligns transmissions with these periodic active periods, creating a rhythm of transmission and rest that reduces energy consumption while maintaining communication reliability through scheduled periodic check-ins.
Solution Approach 2:
The patent uses Hybrid Automatic Repeat Request (HARQ) feedback mechanisms where the destination device sends acknowledgments (ACK/NACK) during active time to confirm receipt of transmissions. This feedback loop allows the source device to verify successful delivery and schedule retransmissions appropriately, ensuring reliability while avoiding unnecessary transmissions during destination sleep periods.
2Duration of action of stationary object
If wireless devices use DRX cycles to reduce energy consumption, then battery life is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent implements sensing mechanisms where the source wireless device monitors the destination's DRX cycle pattern and active time schedules in advance. By preliminarily determining when the destination will be active, the source device can proactively buffer and schedule transmissions to coincide with these windows, maximizing spectral utilization during active periods while maintaining the energy-saving DRX structure.
Solution Approach 2:
The patent dynamically adjusts transmission timing and resource allocation based on the destination's DRX cycle state. The system flexibly modulates transmission power, timing, and frequency resource selection according to real-time knowledge of destination activity patterns, optimizing the trade-off between battery life conservation and spectral efficiency in varying communication conditions.
3Use of energy by moving object
If wireless devices align transmissions with destination active time, then energy consumption is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent enables the destination wireless device to autonomously manage its own DRX cycle timing and active time scheduling. The destination device independently determines its active periods and communicates this schedule to the source, allowing the source to self-adjust transmissions without complex centralized coordination, reducing overall system complexity while maintaining energy efficiency.
Solution Approach 2:
The patent creates a universal DRX synchronization mechanism that works across multiple wireless devices and communication scenarios. The same active time indication and scheduling principles apply whether for unicast, groupcast, or broadcast communications, providing a multi-functional framework that handles diverse communication types with a unified approach to energy-efficient resource allocation.
Data Source
AI summary
Methods, apparatus, and systems for saving power among UE in sidelink communications are described herein. The disclosure provides various systems and methods for selecting sidelink resources, and determining whether destination sources are in active time. The disclosure further provides various systems and methods for starting and restarting timers for wireless devices to improve upon communications in sidelink communication systems.