Event-Driven Sidelink DRX Timer Control for Terminal Power Saving
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Solution Overview
Problem
Existing communication systems, particularly in LTE and NR, do not optimize Discontinuous Reception (DRX) mechanisms for sidelink transmissions, leading to inefficient energy consumption in terminals.
Innovation Solution
A method and terminal device that control the state of DRX timers based on specific events related to sidelink transmissions, including the use of downlink information to manage RTT and retransmission timers, optimizing power saving by adjusting wake-up and sleep states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX is not optimized for sidelink transmissions, then spectral efficiency and transmission delay performance are maintained, but energy consumption of terminal increases
Solution Approach 1:
The patent segments the DRX mechanism into separate timers for sidelink transmissions (sl-Drx-RetransmissionTimer, sl-Drx-HARQ-RTT-Timer) distinct from conventional cellular DRX timers. This segmentation allows independent optimization of energy saving for sidelink without affecting conventional cellular communication DRX behavior, resolving the contradiction by enabling targeted energy optimization while maintaining overall system functionality.
Solution Approach 2:
The patent applies local quality by configuring DRX parameters specifically for sidelink resources rather than applying uniform DRX settings across all transmissions. The network can configure different drx-Config values for sidelink, allowing localized optimization of power consumption in the sidelink domain while preserving conventional cellular DRX performance characteristics.
2Reliability
If terminal continuously monitors sidelink resources, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action through DRX cycles where the terminal alternates between active monitoring periods and sleep periods for sidelink resources. During active periods, the terminal monitors for retransmissions and new transmissions; during sleep periods, monitoring is suspended. This periodic pattern maintains transmission reliability during critical periods while reducing power consumption during non-critical periods.
Solution Approach 2:
The patent uses feedback mechanisms where the terminal monitors for feedback indicators (such as HARQ ACK/NACK) during active DRX periods. When feedback indicates successful reception or when no retransmission is required, the terminal can transition to sleep mode, optimizing the balance between reliability monitoring and power consumption based on actual transmission outcomes.
Data Source
AI summary
The present application relates to a sidelink transmission method and a terminal. The method includes: a terminal receives downlink information, which is used for indicating a resource license of a sidelink; the terminal controls, on the basis of a first event, a state of a timer related with discontinuous reception (DRX) for the sidelink.