Sidelink DRX Timer Synchronization for Low-Latency Terminal Interaction
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Solution Overview
Problem
The independent DRX mechanisms in sidelink transmission between terminal devices lead to significant latency during interactions, as timers at both ends of the interaction are not synchronized, causing delays in response and data transmission.
Innovation Solution
Implementing a method where timers at both ends of the interaction are triggered to start or restart simultaneously, ensuring both ends are in an active state, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If independent DRX mechanisms are implemented in sidelink transmission between terminal devices, then power consumption is reduced through discontinuous reception, but latency increases due to lack of timer synchronization between interacting devices
Solution Approach 1:
The patent merges the timer control mechanisms of both terminal devices by introducing a timer indication field in the sidelink control information. This allows the first terminal device to control the timing behavior of the second terminal device's timer, effectively combining their independent DRX mechanisms into a coordinated system that maintains synchronization while preserving power-saving benefits
Solution Approach 2:
The patent implements feedback by having the first terminal device send timer indication information to the second terminal device through sidelink control information. This feedback mechanism allows the receiving terminal to adjust its timer behavior based on the transmitting terminal's timing requirements, enabling synchronized DRX operation without continuous active monitoring
2Speed
If timers at both ends of interaction are synchronized to reduce latency, then interaction speed improves, but device complexity increases due to coordinated timer control mechanisms
Solution Approach 1:
The patent segments the timer control functionality into distinct components: the first terminal device generates timer indication information, the sidelink control information structure is segmented to include this indication, and the second terminal device processes and acts on this indication. This segmentation allows each device to implement relatively simple local logic while achieving coordinated timer synchronization
Solution Approach 2:
The patent introduces timer indication information as an intermediary element that mediates between the two terminal devices' timer mechanisms. This intermediary carries timing instructions from the first terminal to the second terminal, enabling synchronized timer control without requiring complex direct coordination or additional signaling infrastructure
Data Source
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AI summary
Provided in the embodiments of the present application are a timer control method and apparatus, and a terminal device. The method comprises: after sending a first physical transmission to at least one second terminal device, a first terminal device starting or restarting a first timer, wherein during the running of the first timer, the first terminal device is in an activated state; and the second terminal device receiving the first physical transmission sent by the first terminal device, and then starting or restarting a second timer, wherein during the running of the second timer, the second terminal device is in an activated state.