Sidelink DRX Wake-Up Control via Feedback Signal Detection
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Solution Overview
Problem
In sidelink communication, devices are often required to remain constantly awake to monitor feedback channels, leading to high energy consumption, especially in power-constrained scenarios, which limits the applicability of sidelink communication.
Innovation Solution
Implementing sidelink discontinuous reception (DRX) based on feedback signal detection to extend the wake-up time of devices, allowing them to conserve energy by monitoring feedback channels only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices remain constantly awake to monitor feedback channels, then feedback signal detection reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the receiver alternates between active monitoring periods and sleep periods. During active periods, the receiver monitors feedback channels for signals. During sleep periods, the receiver conserves energy by not monitoring. This periodic action resolves the contradiction by providing reliability during active periods while reducing energy consumption through sleep periods, eliminating the need for constant wakefulness.
Solution Approach 2:
The patent uses feedback signals transmitted by the receiver to inform the transmitter about reception status. When the transmitter detects these feedback signals indicating successful reception, it can stop transmissions and allow the receiver to enter sleep mode. This feedback mechanism enables the system to maintain reliability by ensuring proper reception while reducing energy consumption by eliminating unnecessary continuous monitoring and transmissions.
2Use of energy by moving object
If devices use discontinuous reception to conserve energy, then energy consumption is reduced, but feedback signal detection capability deteriorates
Solution Approach 1:
The patent implements resource indication where the transmitter pre-allocates and indicates specific time-frequency resources for feedback signals before the actual data transmissions occur. The receiver uses this advance information to know exactly when and where to monitor for feedback signals during its active periods. This preliminary action ensures that even with discontinuous reception, the receiver can reliably detect feedback signals when needed while maintaining energy savings during sleep periods.
3Use of energy by moving object
If wake-up time is extended continuously, then energy consumption is reduced through longer sleep periods, but transmission responsiveness deteriorates
Solution Approach 1:
The patent implements dynamic wake-up time extension where the receiver extends its wake-up time based on detected feedback signals and transmission patterns. When feedback signals indicate ongoing transmissions or potential retransmissions, the receiver dynamically extends its active period to maintain responsiveness. When no such signals are detected, the receiver returns to shorter active periods for maximum energy savings. This dynamic adjustment resolves the contradiction by adapting wake-up time to actual transmission needs.
Data Source
AI summary
Disclosed is a method comprising receiving a first transmission from a first terminal device, wherein the first transmission indicates one or more resources to be used at least for a second transmission, monitoring one or more physical feedback channel resources associated with the indicated one or more resources, detecting one or more feedback signals from the monitored one or more physical feedback channel resources, and extending a wake-up time based at least partly on the detected one or more feedback signals.