Sidelink Communication Timer Control for DRX Data Reception
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Solution Overview
Problem
In sidelink communication, the receive-end device cannot monitor the physical sidelink control channel due to a discontinuous reception (DRX)-on duration timer, leading to delayed data transmission as it cannot receive sidelink control information (SCI) in time, resulting in data transmission delays.
Innovation Solution
The receive-end device starts a timer based on received SCI to monitor for subsequent SCI and data transmission, ensuring it remains in an active periodicity to receive data in time, and the transmit-end device reserves transmission resources that align with the receive-end's active periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the receive-end device uses DRX mechanism to save power, then power consumption is reduced, but the device cannot monitor PSCCH in time and data transmission delay increases
Solution Approach 1:
The transmit-end device performs preliminary actions by reserving transmission resources in advance and sending SCI before the receive-end device's DRX on-duration timer expires. This ensures the receive-end device can receive control information even during its sleep period, resolving the contradiction between power saving and timely data reception
Solution Approach 2:
The SCI acts as an intermediary that bridges the gap between transmit-end and receive-end devices during DRX cycles. By carrying resource location information, SCI enables the receive-end device to wake up at appropriate times or use pre-allocated resources, reducing data transmission delay while maintaining power saving benefits
2Reliability
If the receive-end device starts a timer to monitor second SCI, then the active periodicity is prolonged and SCI reception success rate improves, but the device remains in active state longer increasing power consumption
Solution Approach 1:
The system dynamically adjusts the active periodicity based on transmission needs. The timer mechanism allows the receive-end device to extend its active state only when necessary (when first SCI indicates data transmission needs monitoring), rather than maintaining continuous activity. This dynamic adjustment balances reliability improvement with power consumption control
Data Source
AI summary
This application provides a communications method and apparatus. The method includes: after receiving first sidelink control information from a first transmit-end device, a receive-end device starts a first timer. Running time of the first timer is used by the receive-end device to monitor second SCI and/or information about sidelink data transmission.