Sidelink Power Allocation for Stable Synchronization Signal Switching
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Solution Overview
Problem
In sidelink communication using unlicensed spectrum, ensuring stable channel transmit power and preventing communication interruptions due to fluctuations in transmit power during synchronization signal switching is a challenge.
Innovation Solution
Determine a frequency domain resource set for synchronization signals and adjust transmit power based on a maximum power and a parameter to maintain stable power, ensuring consistent transmission performance by minimizing power fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal contends for channel through listen-before-talk in unlicensed spectrum, then the terminal can use spectrum resources through contention, but the transmit power fluctuates during synchronization signal switching causing communication interruptions
Solution Approach 1:
The patent applies preliminary action by pre-determining the quantity of frequency domain resource sets (Q) that can be used for synchronization signals before actual transmission. This preliminary configuration allows the terminal to plan power distribution in advance, avoiding power fluctuations during runtime synchronization switching and maintaining reliable transmit power levels while enabling flexible spectrum utilization through contention-based access
2Productivity
If the terminal shares channel resource with another terminal after successful LBT, then spectrum efficiency is improved, but transmit power stability becomes harder to maintain
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the quantity of frequency domain resource sets (Q) allocated for synchronization signals based on channel sharing conditions. When multiple terminals share the channel, the system modifies the parameter Q to optimize power distribution across synchronization signals, maintaining transmit power stability while enabling efficient spectrum sharing and improving overall productivity
Data Source
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AI summary
This application provides a communication method and an apparatus. The method includes: determining a first frequency domain resource set in a first time unit, determining a transmit power for a first message based on a maximum transmit power of a first device and a first parameter, and sending the first message in the first time unit based on the transmit power for the first message. The transmit power for the first message does not exceed a difference between the maximum transmit power of the first device and the first parameter, the first frequency domain resource set includes a frequency domain resource of a synchronization signal used for synchronization, the first frequency domain resource set is included in M frequency domain resource sets that carry the first message, M is a quantity of frequency domain resource sets occupied by the first message in a BWP, Q is a maximum quantity of frequency domain resource sets used for sending a synchronization signal in the BWP, M is less than or equal to Q, and Q is an integer greater than or equal to 2. According to the method disclosed in this application, fluctuation in a signal power for transmitting the synchronization signal on the first frequency domain resource set can be avoided, ensuring transmission performance.