Uplink Power Control Using PHR Feedback for Channel Changes
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Solution Overview
Problem
Existing communication systems face resource waste due to inadequate power allocation by network devices, which cannot adapt to changing channel conditions, leading to suboptimal communication performance.
Innovation Solution
A power control method that involves reporting changes in power class or full power transmission mode by a terminal device, using power headroom reports (PHR) to inform the network device, allowing it to adjust transmission parameters to optimize communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the network device allocates transmit power to the terminal based on terminal capability, then full power transmission can be implemented, but the transmit power cannot adapt to channel status changes
Solution Approach 1:
The terminal device monitors channel status and feeds back power headroom information to the network device. When the actual transmit power differs from the allocated power by a threshold (e.g., 3dB), the terminal sends a PHR message containing power headroom values and full power transmission mode indicators, enabling the network device to adjust power allocation based on real-time channel conditions.
Solution Approach 2:
The system transitions from static power allocation based on terminal capability to dynamic power adjustment based on real-time channel status. The terminal device dynamically determines full power transmission modes (mode 0, mode 1, or mode 2) based on current channel conditions and power class, and the network device continuously updates power allocation in response to PHR feedback.
2Reliability
If the network device cannot learn of channel status changes, then power allocation remains simple, but communication performance deteriorates
Solution Approach 1:
The terminal device sends PHR messages containing power headroom information and full power transmission mode indicators to the network device. This feedback mechanism ensures the network device receives real-time channel status information, enabling it to make informed power allocation decisions and improve communication reliability.
Solution Approach 2:
The terminal device pre-calculates power headroom values and determines appropriate full power transmission modes based on monitored channel status before sending PHR messages. This preliminary preparation ensures the network device receives ready-to-use information for immediate power allocation adjustments.
3Loss of energy
If power headroom report is used to carry first information, then overhead is reduced, but the report structure becomes more complex
Solution Approach 1:
The patent combines multiple information elements (power headroom values, full power transmission mode indicators, and other PHR elements) into a single PHR message structure. By merging these information types into one standardized report format, the system reduces overall signaling overhead while managing complexity through unified structure design.
Data Source
AI summary
This application provides a power control method, and a communication apparatus and system. The power control method is applicable to uplink transmission. In the power control method, when a transmission mode or a power class changes, a terminal device reports the change to a network device, or reports a changed transmission mode, so that the network device learns of a channel status change in a timely manner, and properly allocates transmission