Path Loss Determination in High-Frequency Communications
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Solution Overview
Problem
In high-frequency communications systems, the existing method of notifying user terminals of only one transmit power for reference signals in LTE systems fails to satisfy path loss measurement requirements, leading to inadequate uplink power control due to different transmit powers across signals.
Innovation Solution
A method where the base station pre-configures correspondences between multiple signals and their transmit powers, sending this information to terminals, allowing them to accurately measure path loss and determine transmit powers for each signal, thereby ensuring proper uplink power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station notifies the user terminal of only one reference signal transmit power (as in LTE system), then the device complexity is reduced and ease of operation is improved, but the path loss measurement precision deteriorates when different transmit powers are used
Solution Approach 1:
The patent segments the reference signals into multiple groups (first group and second group) with different transmit powers. The base station separately notifies the user terminal of transmit powers for reference signals in different groups, enabling accurate path loss measurement for each group while maintaining manageable system complexity through structured organization.
Solution Approach 2:
The patent applies local quality by allowing different reference signals within the same group to have the same transmit power (local uniformity), while different groups can have different transmit powers (local differentiation). This enables precise path loss measurement for each local group while managing overall system complexity through localized power configuration.
2Adaptability or versatility
If multiple reference signals with different transmit powers are used in high-frequency communications, then the adaptability to high frequency characteristics is improved, but the path loss measurement precision deteriorates without proper power notification
Solution Approach 1:
The patent introduces dynamic power configuration for reference signals in high-frequency systems. The base station can dynamically assign different transmit powers to different reference signal groups and notify the user terminal accordingly, enabling the system to adapt to varying high-frequency channel conditions while maintaining accurate path loss measurement through proper power information provision.
3Loss of information
If the base station notifies transmit powers for multiple reference signal groups, then the path loss measurement precision is improved, but the loss of information is reduced and uplink power control is enhanced
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure and notify the user terminal of transmit powers for different reference signal groups before uplink transmission. This preliminary power information provision enables the user terminal to perform accurate path loss measurement and calculate appropriate uplink transmit powers in advance, reducing information loss and improving power control efficiency without excessive complexity.
Data Source
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AI summary
This application provides a path loss determining method and apparatus. The method includes: measuring a receive power of a signal sent by a network device; determining a transmit power of the signal based on pre-configuration information, where the pre-configuration information is used to indicate correspondences between a plurality of signals and transmit powers, transmit powers of some or all of the plurality of signals are different, and the signal is one of the plurality of signals; and determining a path loss based on the receive power of the signal and the transmit power of the signal. This application can satisfy a path loss measurement requirement when there are different transmit powers.