D2D Terminal Power Control Using Path Loss and Channel Quality
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Solution Overview
Problem
Existing power control methods in device-to-device communication result in unnecessary power consumption due to the use of transmission powers higher than required, especially when terminals are close to each other and channel quality is not considered.
Innovation Solution
A power control method that determines transmission power based on both path loss and channel quality status between terminals, allowing for more accurate power determination and reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If path loss between terminal and network device is used to determine transmission power, then transmission power can be controlled to avoid interference, but terminal may use power greater than required when terminals are close to each other
Solution Approach 1:
The patent changes the parameter basis for power determination from path loss between terminal and network device to path loss between two terminals. By measuring the actual path loss between transmitting and receiving terminals directly, the system adjusts the power calculation parameters to match the actual communication scenario, enabling more precise power control that reflects the true distance and channel conditions between D2D terminals.
2Device complexity
If transmission power is determined without considering channel quality status, then power control can be simplified, but unnecessary power waste occurs when terminals are close
Solution Approach 1:
The patent introduces feedback mechanisms where terminals measure and report channel quality status (CQI) and path loss information to the network device. The network device uses this feedback to determine appropriate power parameters, creating a closed-loop control system that continuously adapts power levels based on actual channel conditions, thereby eliminating power waste while maintaining manageable system complexity through automated feedback processing.
Solution Approach 2:
The patent replaces manual or simplified power control mechanisms with an automated system that substitutes direct measurement and calculation of path loss and channel quality. Instead of using predetermined or network-device-centric path loss values, the system automatically measures actual terminal-to-terminal path loss and channel conditions, substituting mechanical/simplified control with intelligent adaptive control that reduces power waste.
Data Source
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AI summary
This application provides a power control method, a terminal, and a network device. In the method, when any one of two terminals that perform direct communication determines a transmission power of the terminal, the terminal determines the transmission power based on at least one of a path loss between the two terminals that perform direct communication and a channel quality status of another terminal used as a receive end in the two terminals that perform direct communication, so that a more accurate power can be determined, and therefore signal transmission can be performed based on the determined transmission power, to avoid, to some extent, using a power higher than an actually required transmission power to perform signal transmission.