DRX Sidelink Resource Selection for V2X
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Solution Overview
Problem
In Discontinuous Reception (DRX) configurations, terminal devices may acquire inaccurate sensing results during off-durations, leading to resource collisions due to incomplete monitoring and decoding, which affects resource selection in V2X communications.
Innovation Solution
A method where a first terminal device receives sidelink control information and reference signals during on-durations of DRX cycles and determines available candidate resources for sidelink transmissions by analyzing overlapping periods between off-durations and sensing windows, ensuring accurate resource selection and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device enters inactive status during off-duration of DRX cycle, then power consumption is reduced, but sensing accuracy deteriorates leading to resource collisions
Solution Approach 1:
The terminal device performs sensing operations during the on-duration period before entering the off-duration inactive state. By completing resource pool sensing, SCI reception, and RSRP measurement in advance during the active period, the device prepares sufficient information to make resource selection decisions without needing to remain active during off-duration, thus maintaining sensing accuracy while reducing power consumption.
Solution Approach 2:
The invention dynamically adjusts the terminal device's operational state by switching between active (on-duration) and inactive (off-duration) statuses based on the DRX cycle configuration. During on-duration, the device is active and performs sensing; during off-duration, it transitions to inactive state to save power. This dynamic state management allows the system to optimize between power consumption and sensing accuracy by performing critical sensing operations only when active.
2Measurement precision
If the terminal device performs full sensing continuously, then resource selection accuracy is improved, but power consumption increases
Solution Approach 1:
The terminal device performs sensing operations periodically during on-duration intervals of the DRX cycle rather than continuously. The sensing is conducted in periodic bursts when the device is in active state, followed by inactive periods where no sensing occurs. This periodic sensing approach maintains resource selection accuracy by ensuring sensing is performed at regular intervals while significantly reducing overall power consumption compared to continuous sensing.
3Reliability
If the terminal device monitors control channel during on-duration, then resource collision detection is improved, but device complexity increases
Solution Approach 1:
The invention extracts and isolates the monitoring function to specific time intervals (on-duration periods) rather than requiring continuous monitoring. By taking out the monitoring operation and confining it to discrete on-duration windows within the DRX cycle, the device can detect resource collisions effectively during these periodic intervals while reducing the overall monitoring complexity and power requirements compared to continuous monitoring.
Data Source
AI summary
Embodiments of the present disclosure relate to a method, device and computer readable media for communications. A method comprises receiving, at a first terminal device from a second terminal device, first sidelink control information and a first reference signal associated with the first sidelink control information during an on-duration of a discontinuous reception cycle. The method also comprises in accordance with a determination that an overlapping period exists between an off-duration of the discontinuous reception cycle and a sensing window, determining an available candidate resource in a resource selection window for a first sidelink transmission based at least on the first sidelink control information and the first reference signal.