Sidelink DRX Synchronization for Uu Link Power Optimization
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Solution Overview
Problem
Current sidelink communication systems face challenges in efficiently managing discontinuous reception (DRX) operations on both Uu links and sidelinks, leading to increased power consumption and delays due to independent DRX cycles, which affect communication efficiency and performance.
Innovation Solution
A method and apparatus for sidelink discontinuous reception (SL DRX) that synchronizes DRX states between terminals and the base station, adjusting Uu DRX cycles based on SL DRX states to optimize resource allocation and reduce unnecessary wake-ups, thereby improving communication efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent DRX cycles are used on Uu links and sidelinks, then communication flexibility is improved, but power consumption increases and communication delays occur
Solution Approach 1:
The patent combines the Uu link DRX operation and sidelink DRX operation into a unified DRX framework. The terminal device synchronizes its DRX cycle timing across both Uu and sidelink interfaces, allowing it to enter idle mode simultaneously for both links when no data transmission is required, thereby reducing power consumption while maintaining communication flexibility through coordinated resource allocation.
2Adaptability or versatility
If independent DRX cycles are used on Uu links and sidelinks, then communication flexibility is improved, but communication delays increase
Solution Approach 1:
The patent merges the DRX timing mechanisms of Uu and sidelink communications, synchronizing the idle and active periods across both interfaces. This coordination ensures that when the terminal wakes up for sidelink communication, it is also available for Uu link communication, eliminating delays caused by asynchronous wake-up schedules while preserving the flexibility of independent DRX configuration.
3Adaptability or versatility
If DRX operation is performed on both Uu link and sidelink independently, then link independence is maintained, but resource allocation efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device reports its DRX state and resource availability to the network side based on the synchronized DRX operation. The network side uses this feedback to optimize resource allocation decisions, coordinating uplink resources with sidelink resources to improve overall efficiency while maintaining the independence of each link's DRX configuration through flexible parameter adjustment.
Data Source
AI summary
An operation method of a first terminal comprises receiving, from a base station, DRX state information indicating a Uu DRX state in a Uu link between the base station and the first terminal and a first SL DRX state in a first SL between the first terminal and a second terminal, performing communication with the base station on the Uu link based on the Uu DRX state indicated by the DRX state information and performing communication with the second terminal on the first SL based on the first SL DRX state indicated by the DRX state information.