SRS Power Control for Beam Management in NR Systems
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Solution Overview
Problem
In New Radio (NR) systems, the selection of transmit power for Sounding Reference Signals (SRS) significantly affects beam management and channel state information acquisition, but existing methods lack effective power control mechanisms.
Innovation Solution
A wireless communications method that determines a closed-loop power control parameter for an SRS resource group based on an uplink or downlink signal, allowing for targeted transmit power adjustment to optimize SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power for SRS is not controlled, then beam management and channel state information acquisition can be performed, but the selection of receive beam and transmit beam is affected and cannot be optimized
Solution Approach 1:
The patent implements closed-loop power control by determining power control parameters based on downlink reference signals received from the network side. The terminal device uses feedback information about downlink signal quality to adjust SRS transmit power, enabling the system to optimize beam selection and channel state information acquisition through iterative power adjustment.
Solution Approach 2:
The patent changes the transmit power parameter of SRS signals dynamically based on determined power control parameters. By adjusting the power level of SRS transmissions according to downlink signal conditions, the system optimizes both beam management performance and channel state information acquisition without requiring complex manual control.
2Measurement precision
If transmit power for SRS is increased, then signal strength for beam selection is improved, but energy consumption increases and may cause interference
Solution Approach 1:
The patent dynamically adjusts the transmit power parameter of SRS signals based on determined power control parameters. By optimizing the power level according to downlink signal conditions, the system achieves sufficient signal strength for accurate beam selection while minimizing energy consumption and interference, avoiding both too low and too high power transmission.
Solution Approach 2:
The system uses feedback about downlink reference signal quality to determine appropriate SRS transmit power levels. This feedback mechanism ensures that power is increased only when necessary for adequate signal strength measurement, while reducing power when conditions permit, thereby optimizing the balance between measurement precision and energy consumption.
3Productivity
If different power control parameters are used for different SRS resources, then power optimization is achieved, but system complexity increases
Solution Approach 1:
The patent determines power control parameters based on downlink reference signals that serve multiple purposes. The same downlink signal used for channel state information acquisition also serves as the basis for determining SRS power control parameters, allowing one reference signal to fulfill multiple functions and reducing overall system complexity while maintaining power optimization efficiency.
Data Source
AI summary
Embodiments of this application provide a wireless communications method and device, to perform appropriate power control on an SRS. The method includes: determining a closed-loop power control parameter for a sounding reference signal SRS resource group according to a first uplink signal or a first downlink signal corresponding to the SRS resource group; determining a target transmit power for the SRS resource group according to the closed-loop power control parameter; and sending an SRS to a network device on an SRS resource in the SRS resource group according to the target transmit power.