NR Uplink Beam Power Control for Interference-Aware PUSCH
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Solution Overview
Problem
Uplink power control mechanisms in New Radio (NR) systems face challenges due to path loss, channel fades, and inter-cell interference, which affect target performance and require adjustments to maintain optimal transmission.
Innovation Solution
The method involves transmitting uplink signals using multiple beams with common and beam-specific parameters, including target receive power, MCS offsets, and transmit power control commands, to optimize transmission power based on deployment, mobility, and interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink power control adjusts transmit power to counter path loss and channel fades, then target performance is maintained, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by introducing beam-specific parameters (estimated path loss, configurable fractional power compensation factor, configurable maximum transmit power level) alongside common parameters. Each beam receives customized power control adjustments based on its specific channel conditions, allowing the system to maintain target performance for each beam while minimizing interference to other cells through localized optimization.
2Productivity
If multiple beams are transmitted with beam-specific power control, then transmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent segments power control parameters into two categories: common parameters (target receive power, MCS specific offset, TPC command) that apply to all beams, and beam-specific parameters (estimated path loss, fractional power compensation factor, maximum transmit power level) that are customized for each beam. This segmentation allows efficient power control across multiple beams while managing system complexity through structured parameter organization.
3Object-generated harmful factors
If transmit power is dynamically adjusted based on interference levels, then inter-cell interference is minimized, but power control complexity increases
Solution Approach 1:
The patent implements dynamics by allowing beam-specific parameters (particularly the configurable fractional power compensation factor and maximum transmit power level) to be adjusted dynamically or semi-statically based on deployment scenarios, WTRU mobility, and interference levels. This enables the system to adapt to changing conditions and minimize inter-cell interference while maintaining manageable power control complexity through structured parameter adjustment.
Data Source
AI summary
The disclosed method and an apparatus are directed to determine an uplink transmission power in in New Radio (NR) systems by a wireless transmit/receive unit (WTRU) for transmitting at least one physical uplink shared channel (PUSCH), using multiple beams toward multiple Tx/Rx points (TRPs). The method includes determining common parameters like a target receive power, a modulation and coding scheme (MCS) specific offset, and a transmit power control (TPC) command parameters common to the multiple beams. The method also includes determining beam-specific parameters like path loss for each beam, a configurable fractional power compensation factor for each beam, and a configurable maximum transmit power level of the each beam, wherein the fractional power compensation factor and the configurable maximum transmit power level for the each beam are determined dynamically or semi-statically based on at least deployment, WTRU mobility, or interference level. The method further includes transmitting at least one codeword to at least one receiving station using at least one of the multiple beams, which having a transmit power calculated based on the common parameters and the beam-specific parameters.