Sidelink DRX Timing Alignment for Reliable Low-Power Data Transmission
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Solution Overview
Problem
The introduction of a DRX mechanism in sidelink transmission for power saving in terminal devices leads to reliability issues in unicast and multicast communication, as the receiving end may not be in a monitoring state when data is sent.
Innovation Solution
First and second terminal devices exchange DRX configuration information or adjust DRX parameters to ensure the receiving end is in a monitoring state during data transmission, allowing correct reception of sidelink data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a DRX mechanism is introduced in sidelink transmission for power saving, then power consumption is reduced, but transmission reliability deteriorates
Solution Approach 1:
The sending terminal obtains the DRX configuration information of the receiving terminal before data transmission, and determines the monitoring duration of the receiving terminal in advance. This allows the sending terminal to schedule data transmission within the predetermined monitoring duration, ensuring the receiving terminal is in monitoring state when data arrives, thus maintaining transmission reliability while enabling power saving through DRX
Solution Approach 2:
The receiving terminal sends DRX configuration information to the sending terminal, providing feedback about its monitoring schedule. This feedback mechanism enables the sending terminal to align its transmission timing with the receiving terminal's monitoring periods, resolving the conflict between power saving and transmission reliability
2Use of energy by moving object
If the receiving terminal switches to DRX state to save power, then power efficiency is improved, but data reception reliability deteriorates
Solution Approach 1:
The receiving terminal determines its monitoring duration in advance based on DRX configuration information before data transmission occurs. This preliminary determination ensures the receiving terminal knows exactly when to wake up and monitor for data, maintaining reception reliability while spending most time in low-power DRX state
Solution Approach 2:
The receiving terminal dynamically switches between monitoring state and DRX state based on the predetermined monitoring duration. This dynamic state transition allows the terminal to achieve power efficiency by staying in DRX state most of the time, while ensuring reliability by being in monitoring state precisely when data is transmitted
3Reliability
If continuous monitoring is implemented to ensure reliable reception, then transmission reliability is maintained, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the receiving terminal implements periodic monitoring based on DRX configuration, waking up at predetermined intervals during monitoring duration to check for data. This periodic action maintains data reception reliability by ensuring the terminal is monitoring when data arrives, while dramatically reducing power consumption by remaining in DRX state between monitoring periods
Solution Approach 2:
The monitoring duration and DRX parameters are determined in advance through configuration information exchange. This preliminary setup enables the terminal to follow a predetermined periodic monitoring schedule, ensuring reliability is maintained at key moments while power consumption is reduced during intermediate periods
Data Source
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AI summary
The embodiments of the disclosure provide a data transmission method and apparatus, a parameter adjustment method and apparatus, and a terminal device. The data transmission method comprises: a first terminal device acquiring first discontinuous reception (DRX) configuration information, the first DRX configuration information being used for determining a continuously monitoring duration of a second terminal device, and the first terminal device sending the sidelink data to the second terminal device within the continuously monitoring duration of the second terminal device.