NR Uplink Power Control Using SRS and CSI-RS for Multi-TRP
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Solution Overview
Problem
Existing wireless communication technologies face challenges in power control for multi-antenna panel and multi-TRP scenarios, particularly in New Radio (NR) systems, where beam pairs between base stations and user equipment change frequently, leading to issues in determining transmission parameters and power headroom reports.
Innovation Solution
A method and apparatus for determining transmission parameters, powers, and power headroom reports by acquiring SRS resource sets, utilizing CSI-RS resources for precoding information, and employing downlink control information to manage power control in multi-TRP/multi-panel scenarios, including methods for determining PHR in cases of simultaneous or overlapping uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam mode transmission is used to concentrate energy for high-frequency signals, then coverage is improved, but transmission power control complexity increases in multi-antenna panel/multi-TRP scenarios
Solution Approach 1:
The patent segments the power control process by introducing separate power control parameters for different antenna panels and TRPs. Each panel/TRP can have independent power control settings, allowing the system to manage complex multi-antenna scenarios through modular, segmented control rather than monolithic power management.
Solution Approach 2:
The patent implements dynamic power control by allowing real-time adjustment of power parameters based on beam pair changes and channel conditions. The power control mechanism adapts dynamically to the varying beam scenarios in multi-TRP environments, transitioning power allocations as beams are updated or reconfigured.
2Reliability
If flexible beam update mechanism is implemented to adapt to changing beam pairs, then communication reliability is improved, but transmission parameter determination complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring power control parameters and transmission parameter templates for different beam scenarios. When beam pairs change, the system can quickly select and apply pre-prepared parameter sets rather than calculating everything from scratch, reducing the complexity of real-time parameter determination while maintaining reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors beam pair changes and channel conditions, then adjusts transmission parameters accordingly. The feedback loop provides real-time information about beam performance and power utilization, enabling automated parameter optimization without manual intervention, thus improving reliability while managing complexity through intelligent control.
3Productivity
If multiple uplink transmissions are performed simultaneously in multi-TRP scenarios, then data throughput is improved, but power headroom report accuracy deteriorates
Solution Approach 1:
The patent segments the power headroom reporting by introducing separate PHR measurements for different antenna panels and TRPs. Instead of a single aggregated power report, the system generates segmented power headroom information for each transmission point, allowing accurate power management even when multiple uplink transmissions occur simultaneously across different panels/TRPs.
Solution Approach 2:
The patent adds a spatial dimension to power headroom reporting by associating power measurements with specific antenna panels and TRPs. This dimensional expansion transforms the power headroom report from a single scalar value into a multi-dimensional structure that captures power status across different spatial transmission points, enabling accurate power control for simultaneous multi-TRP uplink transmissions.
Data Source
AI summary
Provided is a method for determining a transmission parameter, including: acquiring a sounding reference signal (SRS) resource set; and determining a transmission parameter of uplink transmission according to at least one channel state information-reference signal (CSI-RS) resource in the SRS resource set. Further provided is a method for determining a transmission power, including: acquiring downlink control information; and determining a transmission power of a second number of uplink transmissions according to a first number of transmission power control (TPC) commands indicated by the downlink control information. Further provided is a method for determining a power headroom report (PHR), including: in a case that there are multiple uplink transmissions that occupy the same time domain resource in one time period, or there are multiple uplink transmissions with the same starting time, determining a PHR in the time period.