Uplink Power Control in CoMP Systems
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Solution Overview
Problem
In LTE systems, the existing methods for determining uplink transmit power control parameters in CoMP transmission scenarios fail to consider coordinated multi-point transmission factors, leading to reduced cell throughput and increased UE power consumption.
Innovation Solution
A method for obtaining uplink transmit power control parameters in CoMP transmission environments, where a base station calculates the downlink path loss and transmit power control command by considering the downlink path loss of the serving cell and coordinated cells, using a sum of differences between path losses and signal-to-interference ratios, to determine accurate power control parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing LTE uplink transmit power control parameters are used in CoMP transmission scenarios, then the system maintains compatibility with standard LTE protocols, but cell throughput is reduced and UE power consumption increases
Solution Approach 1:
The patent modifies the uplink transmit power control parameters by introducing CoMP-specific path loss calculations. Instead of using the standard single-cell path loss, the system calculates path loss based on multiple coordinated cells, dynamically adjusting the power control parameters to match the multi-point transmission scenario, thereby resolving the throughput and power consumption issues
Solution Approach 2:
The patent segments the power control calculation into multiple components corresponding to different coordinated cells. Each cell's path loss is calculated separately and then combined, allowing the system to optimize power distribution across multiple transmission points rather than treating it as a single unified parameter
2Productivity
If uplink transmit power control parameters are determined without considering coordinated multi-point transmission factors, then the calculation process remains simple and fast, but the accuracy of power control deteriorates leading to reduced cell throughput
Solution Approach 1:
The patent implements a feedback mechanism where the base station calculates the downlink path loss for each coordinated cell and provides this information to the UE. The UE uses this feedback to adjust its uplink transmit power control parameters, creating a closed-loop system that continuously optimizes power control accuracy based on actual channel conditions in the CoMP scenario
Solution Approach 2:
The patent performs preliminary calculation of the downlink path loss and sum of differences between coordinated cells before the UE determines the uplink transmit power. This advance preparation of path loss parameters ensures that when the UE calculates the final power control parameters, it already has accurate multi-cell path loss information, improving both accuracy and efficiency
3Measurement precision
If the base station calculates downlink path loss considering multiple coordinated cells, then the power control parameter accuracy improves, but the calculation complexity and processing overhead increase
Solution Approach 1:
The patent creates a universal path loss calculation framework that can handle both traditional single-cell LTE scenarios and CoMP scenarios. The same base station infrastructure and signaling mechanisms are used for both cases, with the multi-cell path loss calculation being an extension rather than a completely separate system, thereby managing complexity while maintaining accuracy
Data Source
AI summary
The present invention provides a method for obtaining an uplink transmit power control parameter, where the method is applicable to a radio communication system using a CoMP transmission technology and includes: obtaining, by an base station, a downlink path loss of a serving cell serving for a UE and a sum of a each difference between a downlink path loss of each coordinated cell serving for the UE and the downlink path loss of the serving cell; obtaining, by the base station, a downlink path loss of the UE in a coordinated multi-point transmission environment and a transmit power control command of the UE in the coordinated multi-point transmission environment according to the downlink path loss of the serving cell and the sum of differences between downlink path losses. Thereby, the reduction of cell throughput and waste of UE power consumption is avoided.