Uplink Power Control for Carrier Frequency Differences
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Solution Overview
Problem
In wireless communication systems, a significant difference in carrier frequencies between uplink and downlink carriers poses a challenge for transmitting uplink signals effectively, as path losses on different carriers are not directly interchangeable, leading to potential failure in sending uplink data.
Innovation Solution
An access network device determines and communicates a power parameter to a terminal, which includes initial transmit power and power adjustment parameters, allowing the terminal to adjust its transmit power based on received signals and path loss differences between carriers, enabling reliable uplink transmission even with large frequency differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If path loss obtained through measurement on one carrier is directly used for uplink transmission on another carrier, then power control simplicity is improved, but transmission reliability deteriorates due to large frequency differences causing significant path loss variations
Solution Approach 1:
The patent introduces a path loss compensation mechanism as an intermediary between the measured path loss and the actual transmit power calculation. The network device provides path loss compensation information that adjusts the directly measured path loss value, enabling the terminal to compensate for frequency difference effects while maintaining the simplicity of direct path loss measurement and application.
2Adaptability or versatility
If carrier frequency difference between shared carrier and dedicated carrier is increased to enable multi-system coexistence, then frequency band utilization is improved, but path loss accuracy deteriorates making direct path loss application infeasible
Solution Approach 1:
The patent changes the path loss parameter by introducing path loss compensation information from the network device. This compensation information adjusts the measured path loss value to account for frequency differences, enabling accurate path loss representation across carriers with significantly different frequencies while maintaining multi-system coexistence capabilities.
3Productivity
If 5G NR and LTE systems share the same frequency band with different carrier frequencies, then spectral efficiency is improved, but uplink transmission reliability on shared carrier deteriorates due to inability to directly apply dedicated carrier path loss
Solution Approach 1:
The patent implements a feedback mechanism where the network device measures the uplink signal received from the terminal on the shared carrier and provides path loss compensation information based on this measurement. This closed-loop feedback enables the terminal to adjust its transmit power accurately, ensuring reliable uplink transmission while maintaining efficient frequency band sharing between 5G NR and LTE systems.
Data Source
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AI summary
This application discloses a communication method, an access network device, and a terminal. The method includes: determining, by an access network device, a power parameter, where the power parameter includes at least one of a transmit power of a terminal on a first carrier and a power adjustment parameter, and the first carrier is an uplink carrier; and receiving, by the access network device, an uplink signal sent by the terminal based on the power parameter. According to this application, a problem that an uplink signal cannot be sent due to a relatively large difference between frequencies of communication carriers can be resolved.