Timer-Based Beacon Echo Procedure for Sidelink Channel Estimation
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Solution Overview
Problem
The existing beacon and echo procedures in wireless communication systems, such as 5G NR, face delays due to the failure of echo signals to arrive at the first UE, often due to physical obstructions or interference, leading to prolonged monitoring of periodic resource pools and subsequent delays in sidelink data transmission, impacting user experience.
Innovation Solution
A timer-based approach where the first UE transmits a beacon signal, starts a timer, and monitors for an echo signal until timer expiration, incrementing a counter if no echo is detected, and retransmits the beacon if the counter is below a threshold, determining channel unavailability if the counter exceeds a threshold, and performing neighbor discovery if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first UE monitors the periodic resource pool for an extended period to detect the echo signal, then the channel estimation reliability is improved, but the time delay for sidelink data transmission increases
Solution Approach 1:
The patent applies preliminary action by having the second UE transmit the echo signal immediately after receiving the beacon signal, before the first UE completes its monitoring period. This allows the first UE to set a timer with a duration longer than the echo transmission time, enabling early completion of the beacon and echo procedure while maintaining reliable channel estimation.
2Measurement precision
If the first UE continuously monitors the periodic resource pool without timer expiration, then the echo signal detection accuracy is improved, but the productivity of sidelink data transmission decreases
Solution Approach 1:
The second UE performs preliminary action by transmitting the echo signal promptly after receiving the beacon. This enables the first UE to use a timer-based approach where the timer duration is set longer than the echo transmission time, allowing accurate detection without continuous monitoring, thus improving productivity.
Solution Approach 2:
The system uses self-service by having the second UE automatically transmit the echo signal in response to the beacon without requiring continuous manual monitoring or intervention from the first UE, enabling efficient automatic channel estimation.
3Reliability
If the first UE waits for echo signal arrival without time limitation, then the channel availability assessment accuracy is improved, but the user experience is worsened due to prolonged delays
Solution Approach 1:
The second UE transmits the echo signal as a preliminary action immediately after receiving the beacon, enabling the first UE to use a timer-based approach with duration longer than the echo transmission time. This ensures accurate channel availability assessment while preventing prolonged delays and improving user experience.
Data Source
AI summary
The aspects described herein may avoid delays and may improve performance at a first apparatus when monitoring a periodic resource pool for an echo signal during a beacon and echo procedure with a second apparatus. The first apparatus transmits a beacon signal using one or more resources in a periodic resource pool, starts a timer, and monitors the periodic resource pool for an echo signal from the second apparatus until expiration of the timer.