Sidelink Positioning Power Control Under CBR Congestion Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately measuring the location of terminals, especially when they are out of coverage, and there is a need for improved power control methods in sidelink (SL) positioning to enhance positioning accuracy.
Innovation Solution
The method involves power control for SL-positioning reference signals (SL-PRS) based on maximum power for congestion control, considering channel busy ratio (CBR) and priority level, to improve positioning accuracy in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power control for SL-PRS is not optimized, then transmission power may be excessively high or low, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power based on CBR measurements and priority levels. The power control mechanism modifies transmission parameters (power level) according to channel conditions and service priority, achieving optimal positioning accuracy while preventing excessive power consumption.
2Reliability
If maximum power for congestion control is not considered, then signal transmission may be unstable, but power resources are wasted
Solution Approach 1:
The patent implements dynamics by making the maximum power for congestion control adaptable rather than fixed. The gNB configures different maximum power levels based on priority levels, and UEs dynamically adjust their transmission power within these limits based on real-time CBR measurements, ensuring both transmission stability and energy efficiency.
Solution Approach 2:
The system changes the power parameter dynamically based on CBR and priority level. By configuring different maximum power values for different priority levels and adjusting actual transmission power based on measured CBR, the system achieves reliable signal transmission while minimizing power waste.
3Measurement precision
If SL positioning is performed without optimized power control, then positioning function can be provided, but positioning accuracy is insufficient
Solution Approach 1:
The patent implements feedback mechanisms where UEs measure CBR on SL channels and report this information back to the gNB. The gNB uses this feedback to configure appropriate maximum power values for congestion control, creating a closed-loop system that improves positioning accuracy through adaptive power control without excessive complexity.
4Reliability
If congestion control is not considered in power control, then power management is simplified, but signal transmission reliability deteriorates
Solution Approach 1:
The patent integrates congestion control by introducing CBR as a key parameter in power control decisions. The system configures maximum power values based on priority levels and adjusts transmission power according to measured CBR, achieving reliable signal transmission while maintaining manageable complexity through standardized procedures.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a first UE in a wireless communication system includes identifying a transmission power for an SL-PRS based on a maximum power for a congestion control, and transmitting, to a second UE, the SL-PRS on an SL BWP based on the transmission power. In case that a resource for the SL-PRS is also used by a PSSCH, the maximum power for the congestion control is identified based on a CBR measured for the PSSCH and a priority level.