Sidelink Power Allocation for High MCS Levels
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Solution Overview
Problem
In wireless communication systems, determining optimal transmission powers for physical sidelink control channels (PSCCH) and physical sidelink shared channels (PSSCH) is challenging, especially when high modulation and coding scheme (MCS) levels are used, as existing methods may degrade error vector magnitude (EVM) performance and lead to in-band or out-band emission issues.
Innovation Solution
A method and apparatus for determining transmission powers of PSCCH and PSSCH in a wireless communication system, where no power offset is applied to the PSCCH when both channels are transmitted in one subframe, and the available power is allocated to increase the PSSCH transmission power, especially when the MCS level is 64-quadrature amplitude modulation (QAM) or higher, to prevent performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power offset value is applied to increase PSCCH transmission power, then control channel reliability is improved, but EVM performance deteriorates and in-band/out-band emission issues occur when using high MCS levels
Solution Approach 1:
The patent changes the power allocation parameters dynamically based on MCS level. When MCS level is 10 or higher, the power offset for PSCCH is set to 0 dB instead of the conventional positive offset, preventing EVM degradation while maintaining control channel reliability through alternative power management strategies.
2Productivity
If transmission power is increased for high MCS levels, then data transmission rate is improved, but signal distortion and emission issues worsen
Solution Approach 1:
The patent modifies the power allocation parameters specifically for high MCS levels (10 and above) by setting the PSCCH power offset to 0 dB, which prevents the signal distortion and emission issues that would otherwise occur when transmitting high-order modulation signals with conventional power boosting.
3Reliability
If power is allocated to PSCCH using conventional methods, then control information is transmitted reliably, but available power for PSSCH is reduced
Solution Approach 1:
The patent changes the power distribution parameters by eliminating the PSCCH power offset at high MCS levels, thereby reallocating the power resources to the PSSCH data channel and increasing the available transmission power for high-rate data transmission while maintaining sufficient control channel reliability.
Data Source
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AI summary
One embodiment of the present invention relates to a method for transmission a sidelink signal by a terminal in a wireless communication system, and the method comprises: a step of determining a transmission power of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH); and a step of transmitting the PSCCH and the PSSCH with the determined transmission power, wherein the PSCCH and the PSSCH are frequency division multiplexed (FDM) in one subframe and transmitted, and when a modulation and coding scheme (MCS) or a modulation order is equal to or larger than a predetermined value, the power offset value for increasing the transmission power is not applied when determining the PSCCH transmission power.