Uplink SRS Power Control via Base Station Indication
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Solution Overview
Problem
In wireless communication systems, determining uplink power levels for sounding reference signals (SRS) based on downlink measurements can result in excessive or inadequate power levels, especially in uplink dense deployments where the uplink receive point is unknown, leading to inaccurate path-loss estimation and inefficient power control.
Innovation Solution
A wireless communication device receives an indication of power spectral density from the base station to determine the uplink power level for SRS transmission, reducing the complexity of power level calculation and avoiding reliance on potentially inaccurate path-loss measurements from downlink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uplink power level is determined based on downlink path-loss measurement, then power control can be implemented, but the power level becomes inaccurate in uplink dense deployment where UL Rx point is unknown
Solution Approach 1:
The patent changes the power control parameter from path-loss based calculation to power spectral density based calculation. The base station determines and indicates the power spectral density for SRS transmission, replacing the traditional UE-based path-loss measurement approach. This parameter change enables accurate power control in UL dense deployment where the UL Rx point is unknown to the UE.
2Productivity
If traditional path-loss based power calculation is used, then power control can be implemented, but calculation complexity increases and processing efficiency decreases
Solution Approach 1:
The patent extracts the power level determination function from the UE and relocates it to the base station. Instead of the UE performing complex path-loss calculations and measurements, the base station determines the power spectral density and indicates it to the UE. This extraction simplifies the UE's processing while maintaining accurate power control.
3Reliability
If UE transmits SRS with power based on DL path-loss measurement, then initial access can be established, but power level is excessive or inadequate leading to inefficient communication
Solution Approach 1:
The patent implements a feedback mechanism where the base station receives measured power of the SRS from the UL Rx point and uses this feedback to determine the UL transmitter configuration. This closed-loop feedback enables the base station to adjust the power spectral density indication to achieve optimal power levels, improving both communication reliability and energy efficiency.
Data Source
AI summary
Aspects of the disclosure relate to power control for reference signals, such as a sounding reference signal (SRS) in an uplink (UL) dense deployment. A user equipment (UE) may receive, via a transceiver, an indication of a power spectral density for a sounding reference signal (SRS) from a base station. The UE may then transmit, via the transceiver, the SRS at a power level that is based on the power spectral density. The base station may then receive, from an uplink (UL) receive point via the communication interface, an indication of a measured power of the SRS received by the UL receive point from the UE. The base station may then transmit, to the UE, an UL transmitter configuration based on the indication of the measured power of the SRS. Other aspects, embodiments, and features are also claimed and described.