Sidelink Transmit Power Control via Path Loss Feedback
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Solution Overview
Problem
Current sidelink communication systems lack effective power control methods to manage transmit power based on path loss between terminals, leading to inefficient power consumption and increased interference.
Innovation Solution
The method involves terminals receiving sidelink resource allocation information, measuring path loss, and adjusting transmit power accordingly, with the base station instructing one terminal to calculate path loss and the other terminal providing received signal strength information to determine optimal transmit power, using different resource pools for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to ensure reliable sidelink communication, then communication reliability is improved, but power consumption increases and interference to other cells increases
Solution Approach 1:
The patent implements feedback mechanisms where terminals report path loss measurements and received signal strength indicators (RSSI) to the base station. The base station uses this feedback to dynamically adjust and allocate optimal transmit power for sidelink communications, ensuring reliable communication while minimizing power consumption and interference.
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on measured path loss and RSSI values. By adjusting the power parameter according to actual channel conditions rather than using fixed high power, the system achieves reliable communication with optimized power consumption.
2Reliability
If transmit power is increased to overcome path loss, then communication coverage is improved, but interference to neighbor cells increases
Solution Approach 1:
The patent dynamically adjusts the transmit power parameter based on measured path loss between terminals and RSSI measurements at the base station. This ensures sufficient coverage by compensating for path loss while avoiding excessive power that would cause interference to neighbor cells.
Solution Approach 2:
The base station receives feedback containing path loss measurements and RSSI values from terminals, then uses this information to allocate optimal transmit power levels. This feedback-driven approach ensures coverage while minimizing harmful interference to other cells.
3Measurement precision
If path loss measurement and power control signaling is implemented, then power control accuracy is improved, but system complexity increases
Solution Approach 1:
The patent enables terminals to autonomously measure path loss and RSSI values using their own resources and capabilities. Terminals perform these measurements and report results to the base station, which then makes power allocation decisions. This self-service approach improves measurement accuracy without significantly increasing overall system complexity.
Data Source
AI summary
An operation method of a first terminal, performed in a communication system, may comprise receiving sidelink resource allocation information from a base station; receiving a first sidelink signal from a second terminal based on the sidelink resource allocation information; calculating a path loss experienced by the first sidelink signal based on the first sidelink signal; transmitting a second sidelink signal including information on the path loss experienced by the first sidelink signal to the second terminal; and receiving, from the second terminal, a third sidelink signal to which a sidelink transmit power determined based on the path loss is allocated.