Sidelink PRS Power Allocation Under CBR and Path Loss Constraints
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Solution Overview
Problem
Existing sidelink communication technologies face inefficiencies and accuracy issues due to unbalanced power allocation during simultaneous transmission of Positioning Reference Signals (PRS) and other signals, leading to transmission errors and reduced efficiency during peak periods.
Innovation Solution
A method for determining base transmission power of PRS based on PCMAX, PMAX,CBR, and PPRS,SL(i), and allocating PRS transmission power equal to or greater than the base power, ensuring balanced power allocation among PRS, PSSCH, and PSCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If simultaneous transmission of PRS and multiple types of signals is supported, then signal transmission capability is improved, but power allocation balance deteriorates
Solution Approach 1:
The patent segments the total transmission power into distinct power components for different signals (PRS, PSSCH, PSCCH). By calculating separate power values for each signal type based on their specific requirements and path loss conditions, the system achieves balanced power allocation while maintaining simultaneous transmission capability. This segmentation prevents any single signal from dominating the power budget.
Solution Approach 2:
The patent applies local quality by assigning different power levels to different signals based on their specific transmission requirements. PRS receives power calculated considering positioning accuracy requirements, while PSSCH and PSCCH receive power based on their data transmission needs. Each signal type gets optimized power allocation tailored to its specific function and conditions.
2Ease of manufacture
If fixed power allocation method is used, then implementation simplicity is improved, but transmission efficiency deteriorates during peak periods
Solution Approach 1:
The patent transitions from fixed power allocation to dynamic power allocation by calculating power values in real-time based on current transmission conditions. The power allocation adjusts according to path loss measurements, signal type requirements, and available power budget, enabling the system to adapt to changing conditions and maintain high transmission efficiency during peak periods.
Solution Approach 2:
The patent changes power allocation parameters dynamically based on transmission conditions. By calculating power values using formulas that incorporate path loss compensation, signal type-specific parameters, and remaining power budget, the system optimizes power allocation for each transmission occasion rather than using a fixed predetermined allocation.
3Loss of energy
If PRS power is not sufficiently allocated, then overall power efficiency is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent performs preliminary power calculation for PRS before final power allocation. By first determining the base power for PRS based on positioning accuracy requirements and path loss conditions, and then adjusting the remaining power budget for other signals, the system ensures positioning accuracy is maintained while optimizing overall power efficiency.
Solution Approach 2:
The patent incorporates feedback mechanisms where path loss measurements and signal quality indicators are used to adjust power allocation. The system continuously monitors transmission conditions and adjusts power values accordingly, ensuring PRS receives sufficient power for accurate positioning while the overall system maintains power efficiency through adaptive allocation.
Data Source
AI summary
A Positioning Reference Signal (PRS) supporting sidelink power allocation method is provided. The method includes: determining base transmission power of a PRS based on PCMAX, PMAX,CBR and PPRS,SL(i); and allocating PRS transmission power for the PRS, wherein the PRS transmission power is larger than or equal to the base transmission power of the PRS; wherein PCMAX is a maximum transmission power of a terminal, PMAX,CBR is a maximum transmission power of the terminal under a given Channel Busy Ratio (CBR) PPRS,SL(i) is path loss compensation power of the PRS at an i-th positioning occasion of transmitting the PRS, and i indicates that the i-th positioning occasion is transmitted.