Uplink Power Control for Millimeter Wave Beam Pairs
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Solution Overview
Problem
In LTE systems, the existing power control methods for uplink transmission using millimeter waves are inaccurate due to path loss deviations caused by beam width adjustments for adapting to changing channel conditions, leading to incorrect transmit power determination.
Innovation Solution
A power control method that involves obtaining parameter information including beam reception and sending gains, interference values, and target power settings to accurately determine uplink transmit power for target beams or beam pairs, thereby improving power control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam width is adjusted to adapt to different channel transmission conditions, then beam sending gain and beam reception gain are improved, but path loss estimation accuracy deteriorates
Solution Approach 1:
The patent segments the power control parameters into beam-specific parameters (beam sending gain, beam reception gain) and terminal-specific parameters. By separating the path loss estimation into beam-specific path loss and terminal-specific path loss components, the system can independently adjust beam width for reliability while maintaining accurate path loss estimation through the segmented parameter structure.
2Ease of operation
If existing LTE power control method is used, then implementation simplicity is maintained, but transmit power accuracy deteriorates due to path loss deviation
Solution Approach 1:
The patent introduces beam-specific parameters (beam sending gain, beam reception gain, beam-specific path loss) as additional parameters to the existing LTE power control framework. These parameter changes enable accurate transmit power determination for millimeter wave beam transmission while maintaining the overall power control structure and implementation approach of the LTE system.
3Measurement precision
If beam-specific parameters are considered in power control, then transmit power accuracy is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary calculation and configuration of beam-specific parameters (beam sending gain, beam reception gain, beam-specific path loss) before actual uplink transmission. The network device pre-determines these parameters based on downlink channel measurements and beam training results, then configures them to the terminal through RRC signaling or MAC CE. This preliminary action eliminates the need for complex real-time calculations during transmission, reducing system complexity while maintaining high accuracy.
Data Source
AI summary
A power control method includes obtaining, by a first terminal, parameter information required for power control, where the parameter information includes at least one of a first parameter, a second parameter, and a third parameter, and determining, by the first terminal based on the parameter information, uplink transmit power used when uplink transmission is performed on a target beam or a target beam pair; where the first parameter includes a beam reception gain of a network device and/or a beam sending gain of the first terminal, where the second parameter is used to indicate interference caused by a second terminal to the first terminal on the target beam, and where the third parameter includes beam-specific target power and/or terminal-specific target power.