Joint Channel Correction for Multiple Radio Remote Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies face challenges in achieving joint channel correction among multiple Radio Remote Units (RRUs) in Time Division Duplex (TDD) systems, particularly in ensuring reciprocal uplink and downlink channel ratios, which is essential for coherent transmission and is not adequately addressed by existing methods.
Innovation Solution
A method and apparatus for joint channel correction among multiple RRUs, involving self-correction coefficients acquisition, transmission and reception of correction signals, and compensation coefficients calculation to align uplink and downlink channel ratios across multiple RRUs, using a combination of self-correction, antenna selection, and channel compensation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel correction is performed to each cell respectively using single cell beamforming techniques, then individual cell channel correction is achieved, but inter-cell channel ratio alignment for joint transmission cannot be achieved
Solution Approach 1:
The patent combines self-correction coefficients obtained from individual RRUs with mutual correction coefficients obtained from inter-RRU channel measurements to generate comprehensive correction coefficients. This merging approach enables both individual cell correction and inter-cell alignment, resolving the contradiction between single-cell correction capability and joint transmission requirement
Solution Approach 2:
The patent introduces correction reference signals as an intermediary mechanism that enables RRUs to measure and exchange channel information between them. This intermediary signal facilitates the acquisition of mutual correction coefficients, which serve as the mediator to align channel ratios across different cells for joint transmission
2Productivity
If multiple RRUs are used for joint transmission, then transmission coverage and throughput are improved, but channel ratio inconsistency among RRUs degrades coherent transmission performance
Solution Approach 1:
The patent implements a feedback mechanism where correction reference signals are transmitted and received between RRUs, and the measured channel responses are used to calculate correction coefficients. These coefficients are then applied to compensate for channel ratio inconsistencies, creating a closed-loop feedback system that maintains channel alignment across multiple RRUs
Solution Approach 2:
The patent changes the parameters of correction coefficients by combining self-correction coefficients (obtained from individual RRU calibration) with mutual correction coefficients (obtained from inter-RRU measurements). This parameter transformation enables the system to adapt channel responses dynamically, ensuring consistent channel ratios across different RRUs despite hardware variations
Data Source
Figure 1
Figure 2
Figure 3
AI summary
According to the present invention, a first self-correction coefficient and a second self-correction coefficient are acquired by performing a self-correction to an RRUO and an RRU1 respectively, then a first compensation coefficient and a second compensation coefficient are acquired through transmitting and receiving correction signals to or from each other via any antenna of the RRUO and any antenna of the RRU1, a first correction coefficient and a second correction coefficient are acquired according to the first self-correction coefficient, the first compensation coefficient, the second self-correction coefficient and the second compensation coefficient, and channel compensation is performed to the RRUO and the RRU1 respectively, thus the joint channel correction among multiple RRUs are realized.