Sidelink Transmit Power Control for NR Communication
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Solution Overview
Problem
In sidelink communication, the poor signal receiving performance due to separate determination and transmission of transmit powers for physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) in New Radio (NR) systems, leading to resource waste and inaccurate channel estimation.
Innovation Solution
A method to determine the actual transmit power for sidelink communication, which remains constant across multiple symbols, based on the sidelink transmit power, uplink transmit power, and maximum transmit power, eliminating the need for power switching and reducing processing complexity, thereby improving signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transmit power is calculated for PSCCH and PSSCH in different symbols, then transmit power can be optimized for each channel, but signal receiving performance deteriorates and processing complexity increases
Solution Approach 1:
The patent merges the transmit power determination for PSCCH and PSSCH into a single unified process. Instead of separately calculating transmit power for each channel in different symbols, the terminal device determines a single transmit power value that applies to both channels, thereby simplifying processing while maintaining reliable signal reception.
Solution Approach 2:
The patent changes the transmit power parameter from being dynamically adjusted per channel and symbol to being constant across multiple symbols. This parameter change eliminates the need for power switching operations, reducing processing complexity and improving signal receiving performance by avoiding phase changes.
2Productivity
If power switching is performed between different symbols, then transmit power can be adjusted for different channels, but resource waste increases and signal transmission performance deteriorates
Solution Approach 1:
The patent ensures continuous transmit power application across multiple symbols without interruption for power switching. By maintaining constant transmit power throughout the transmission period, the system eliminates gaps and transitions associated with power switching, thereby improving signal transmission performance and avoiding resource waste.
3Measurement precision
If transmit power varies across symbols, then channel-specific power optimization is achieved, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent creates equipotential conditions by maintaining constant transmit power across all symbols used for sidelink transmission. This uniform power level ensures that the receive end can perform accurate channel estimation without being affected by power variations, thereby improving measurement precision while maintaining sufficient power adaptability through the unified power determination mechanism.
Data Source
AI summary
The disclosure describes example methods. One example method includes obtaining sidelink transmit power and uplink transmit power, where the sidelink transmit power is transmit power of a sidelink in a first time unit, and the uplink transmit power is transmit power of an uplink in the first time unit. An actual transmit power of the sidelink in the first time unit based on the sidelink transmit power, the uplink transmit power, and maximum transmit power. The first time unit includes N first time subunits, M second time subunits in the N first time subunits overlap uplink resources, M is less than or equal to N. The N first time subunits are time subunits used for sidelink transmission in the first time unit, and the actual transmit power of the sidelink is constant in the N first time subunits.