Sidelink Beacon Power Control for Channel Estimation
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Solution Overview
Problem
Current 5G NR technology faces challenges in optimizing beacon-echo procedures for sidelink communication, particularly in determining effective transmission power levels for beacon and echo reference signals, which affects channel estimation and data transmission efficiency.
Innovation Solution
The proposed solution involves a method where user equipment (UE) receives beacon and echo power levels from a base station, transmits beacon reference signals based on these levels, and calculates transmission power for echo signals based on path loss or target reception power, enabling more accurate channel estimation and parameter determination for sidelink shared channel transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed power levels are used for beacon and echo signals, then device complexity is reduced, but channel estimation precision deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power levels of beacon and echo signals based on channel conditions. The transmitting UE sends beacon signals at different power levels, and the receiving UE measures the received power to calculate path loss, thereby adapting the power parameters to current channel states for optimized channel estimation precision.
Solution Approach 2:
The patent implements feedback mechanisms where the receiving UE measures the received beacon signal power and provides this information back to determine echo signal power levels. This feedback loop enables the system to adjust power parameters based on actual channel conditions, resolving the contradiction between simplified power control and precise channel estimation.
2Measurement precision
If dynamic power adjustment is implemented, then channel estimation precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously determine appropriate power levels based on measurements of received beacon signals. The receiving UE calculates path loss from the beacon signal and uses this information to set the echo signal power, eliminating the need for complex centralized power control while maintaining precise channel estimation.
3Reliability
If higher transmission power is used for beacon signals, then signal reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the beacon signal power level variable rather than fixed. The system adjusts the beacon power dynamically based on channel conditions and requirements, sending higher power when reliability is critical and lower power when conditions permit, thereby optimizing the trade-off between signal reliability and energy consumption.
Data Source
AI summary
Aspects presented herein may improve the efficiency and/or the performance of a beacon-echo procedure between sidelink UEs. In one aspect, an apparatus receives, from a base station, at least one of a beacon power level or an echo power level for a beacon-echo procedure. The apparatus transmits, to a second UE, a beacon RS based on the beacon power level. The apparatus receives, from the second UE, an echo RS based on the beacon RS. The apparatus transmits a PSSCH using one or more parameters determined based at least in part on the echo RS.