Uplink Power Control in CoMP Terminals
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Solution Overview
Problem
In new-generation radio access technologies, particularly in CoMP scenarios, there is a challenge in effectively controlling the transmit power on uplink channels to ensure efficient communication, especially when reporting CSI or sending UCI, due to non-ideal backhaul links and the need for coordinated power management between serving and cooperating cells.
Innovation Solution
A power control method that determines transmit power on uplink channels based on multiple transmit power control commands, allowing for efficient power allocation and improved system performance by considering relative or absolute power adjustments and propagation losses, enabling proper power management across multiple network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal separately reports CSI to serving cell and cooperating cell using PUCCH or PUSCH, then the CSI feedback delay is avoided in non-ideal backhaul scenarios, but the uplink power control complexity increases due to multiple power control commands from different network devices
Solution Approach 1:
The patent segments the power control commands into two distinct types: first power control commands from the serving cell and second power control commands from the cooperating cell. Each type is handled through separate receiving processes, allowing the terminal to independently manage power adjustments for each cell while avoiding the complexity of integrated power control. This segmentation enables the terminal to determine first transmit power based on first power control commands and second transmit power based on second power control commands separately.
Solution Approach 2:
The patent introduces a new dimension of power control management by establishing separate power control command reception and processing channels for serving cells and cooperating cells. Instead of handling all power control commands through a single unified mechanism, the system adds a dimensional distinction based on cell type, enabling parallel power control operations that reduce interference and improve coordination in CoMP scenarios.
2Reliability
If the terminal controls transmit power on uplink channels in CoMP scenarios, then communication reliability is improved, but the power allocation efficiency decreases due to conflicting power control commands from multiple network devices
Solution Approach 1:
The patent implements dynamic power control by enabling the terminal to adaptively adjust transmit power based on real-time power control commands received from both serving and cooperating cells. The terminal dynamically determines first transmit power using first power control commands and second transmit power using second power control commands, allowing flexible and responsive power allocation that maintains communication reliability while improving efficiency through adaptive adjustment rather than static power settings.
Solution Approach 2:
The patent establishes a feedback mechanism where the terminal receives power control commands from network devices, processes these commands to determine appropriate transmit power levels, and adjusts its uplink transmissions accordingly. This closed-loop feedback system ensures that power allocation remains efficient and adaptive, with the terminal continuously responding to power control instructions from both serving and cooperating cells to optimize communication performance.
3Adaptability or versatility
If the terminal uses multiple transmit power control commands from different network devices, then proper power management across CoMP cells is achieved, but the device complexity increases due to the need to handle multiple power control protocols
Solution Approach 1:
The patent implements a universal power control architecture where the terminal is designed to handle multiple types of power control commands through a unified processing framework. The terminal can receive and process both first power control commands from serving cells and second power control commands from cooperating cells using the same fundamental mechanisms, making the device versatile and adaptable to different cell types without requiring separate specialized processing paths for each protocol type.
Data Source
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AI summary
This application provides a power control method, a terminal, and a network device. The power control method includes: receiving, by a terminal, at least one piece of downlink control information (DCI) sent by at least one network device, where the at least one piece of DCI includes at least two transmit power control commands; and determining, by the terminal, a transmit power on an uplink channel in a same carrier based on the at least two transmit power control commands. According to the power control method in the embodiments of this application, the terminal can determine the transmit power on the uplink channel based on a plurality of transmit power control commands, thereby ensuring efficient and proper power allocation and improving overall system performance.