Sidelink DRX Timer Control for Low-Power NR V2X Terminals
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Solution Overview
Problem
Existing communication systems, particularly in the context of NR V2X, do not optimize Discontinuous Reception (DRX) for sidelink transmissions, leading to inefficient energy consumption in terminals.
Innovation Solution
A method and terminal implementation that control the state of DRX timers based on specific events, such as receiving or transmitting certain channels, to optimize power saving during sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX is not optimized for sidelink transmissions, then terminal energy consumption increases, but communication reliability is maintained
Solution Approach 1:
The patent applies dynamics by making the DRX timer behavior adaptive rather than static. The timer is dynamically controlled based on whether the terminal is in active transmission/reception states. When the terminal is actively transmitting or receiving sidelink data, the DRX timer is suspended to ensure continuous monitoring and maintain communication reliability. When no active transmission/reception occurs, the timer operates normally to enable power-saving sleep states, thus reducing energy consumption.
Solution Approach 2:
The patent changes the operational parameters of the DRX mechanism by introducing conditional logic that modifies timer behavior based on communication state. The key parameter change is the suspension or resumption of the DRX timer depending on the terminal's active communication status. This parameter adjustment allows the system to switch between power-saving mode (timer running) and communication-active mode (timer suspended), resolving the contradiction between energy consumption and communication reliability.
2Loss of energy
If DRX timer is continuously running, then power saving is achieved, but transmission delay increases
Solution Approach 1:
The patent implements periodic action through the DRX (Discontinuous Reception) mechanism itself, where the terminal alternates between active monitoring periods and sleep periods. The DRX timer creates a periodic pattern of wake-up and sleep cycles. By suspending this periodic action during active sidelink transmission/reception, the patent ensures that when communication is needed, the terminal remains continuously monitored without entering sleep modes that would cause delays, thus balancing power saving with timely response.
Solution Approach 2:
The patent applies preliminary action by proactively suspending the DRX timer before potential communication delays can occur. When the terminal detects active sidelink transmission or reception states, it preemptively suspends the DRX timer to ensure continuous monitoring is ready, preventing any potential transmission delays that would occur if the terminal were to enter sleep mode during active communication scenarios.
3Use of energy by moving object
If DRX is optimized for sidelink, then energy consumption reduces, but device complexity increases
Solution Approach 1:
The patent applies self-service by making the DRX timer automatically suspend and resume based on the terminal's own communication state without requiring external network control. The terminal autonomously monitors its own active transmission/reception status and adjusts the DRX timer accordingly. This self-service mechanism reduces the need for complex network-side coordination and signaling, simplifying the overall system while achieving energy optimization through intelligent, autonomous timer management.
Data Source
AI summary
The present application relates to a sidelink transmission method and a terminal. The method includes: a terminal receives downlink information, the downlink information being used to indicate the resource authorization of a sidelink; and the terminal controls, on the basis of a first event, the state of a timer related to discontinuous reception (DRX) for the sidelink.