Timer-Based Sidelink DRX for UE Power Optimization
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Solution Overview
Problem
In wireless communication systems, UEs face inefficiencies in power consumption and battery life due to continuous monitoring for sidelink communications, leading to increased power usage and decreased battery life, especially when sidelink traffic is intermittent.
Innovation Solution
Implementing a timer-based discontinuous reception (DRX) mode for sidelink communications, where UEs are configured with common active and inactive durations, using an inactivity timer to govern monitoring periods, allowing UEs to periodically monitor and reduce power consumption by pausing or terminating the timer during inactive periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs continuously monitor for sidelink communications, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where UEs periodically switch between active monitoring periods and inactive sleep periods. During active periods, UEs monitor sidelink communications; during inactive periods, UEs pause monitoring to conserve power. This periodic action resolves the contradiction by ensuring communication reliability is maintained during active periods while reducing power consumption through scheduled inactive periods.
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms where UEs can adapt their monitoring behavior based on traffic conditions. The inactivity timer dynamically extends or terminates active periods based on whether new sidelink communications are detected. This dynamic approach allows the system to maintain reliability when needed while optimizing power consumption during low-activity periods.
2Loss of information
If UEs monitor sidelink channel during inactive durations, then detection of additional sidelink communications is improved, but power consumption increases
Solution Approach 1:
The patent employs feedback through the inactivity timer mechanism. When a UE detects a sidelink communication during an active period, the inactivity timer is extended, providing feedback that maintains the active state. If no new communications are detected before the timer expires, the UE transitions to inactive state. This feedback loop ensures complete detection of sidelink communications while optimizing power consumption by avoiding unnecessary monitoring during truly inactive periods.
3Use of energy by moving object
If UEs use timer-based DRX mode, then power consumption is reduced, but monitoring precision deteriorates
Solution Approach 1:
The patent utilizes parameter changes by adjusting the inactivity timer duration based on traffic conditions and UE configurations. The timer can be configured with different values to balance power consumption and monitoring precision requirements. This parameter adjustment allows the system to maintain adequate monitoring precision for detecting sidelink communications while achieving significant power savings through optimized inactive periods.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described related to timer-based sidelink discontinuous reception (DRX). A UE may receive configuration information for a sidelink DRX mode from a base station or another UE, which may indicate one or more parameters of the sidelink DRX mode. When operating in the sidelink DRX mode, a group of UEs may have shared active durations and inactive durations for coordinating sidelink communications. In a timer-based sidelink DRX mode, if a UE receives or transmits a sidelink communication, the UE may initiate an inactivity timer, and the UE may continue to monitor a sidelink channel for other sidelink communications while the timer is running. One or more rules may govern the operation of an inactivity timer with respect to the shared inactive durations.