Coordinated Downlink Weight Calculation for Interference Reduction
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Solution Overview
Problem
In coordinated multipoint transmission (CoMP) technologies, especially non-coherent joint transmission (NCJT), the independent calculation of downlink sending weights by transmission points leads to non-orthogonal receiving directions for electronic devices, resulting in excessive interference between data streams.
Innovation Solution
A method where a server determines a second downlink sending weight for a second transmission point based on the first downlink sending weight of a first transmission point, ensuring orthogonal or approximately orthogonal receiving directions for data streams, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission points independently calculate downlink sending weights, then each transmission point can independently optimize its data stream transmission, but receiving directions of different data streams become non-orthogonal causing excessive interference
Solution Approach 1:
The patent introduces a network device as an intermediary that coordinates the downlink sending weights between multiple transmission points. The network device receives first downlink sending weights from transmission points, calculates second downlink sending weights based on these first weights, and provides them to the transmission points. This intermediary coordination ensures that receiving directions of different data streams are orthogonal, thereby resolving the interference problem while maintaining independent optimization capabilities.
2Productivity
If multiple transmission points send data streams simultaneously, then transmission capacity increases, but interference between data streams becomes excessively large
Solution Approach 1:
The patent changes the parameters of downlink sending weights through coordinated calculation. The network device receives first downlink sending weights from transmission points, then calculates second downlink sending weights that are different from the first weights. This parameter transformation ensures orthogonal receiving directions while allowing multiple transmission points to send data streams simultaneously, thus maintaining high transmission capacity without excessive interference.
3Device complexity
If downlink sending weights are calculated independently at each transmission point, then system complexity is reduced, but receiving directions become non-orthogonal leading to reception errors
Solution Approach 1:
The network device serves as an intermediary that centralizes the complex coordination task. Individual transmission points only need to provide their first downlink sending weights to the network device, which then performs the coordinated calculation of second downlink sending weights. This approach maintains relatively simple operations at transmission points while ensuring high reception accuracy through orthogonal receiving directions achieved by the network device's coordination.
Data Source
AI summary
Embodiments of this application provide a data sending method, an apparatus, a device, and a readable storage medium. A server determines a first transmission point from a coordinated set, and determines a first downlink sending weight of the first transmission point. Then, the server determines a second downlink sending weight of a second transmission point based on the first downlink sending weight, and sends the second downlink sending weight to the second transmission point. When sending a data stream to an electronic device, the second transmission point determines a downlink sending weight corresponding to the data stream from a matrix, weights the data stream, and sends the weighted data stream to the electronic device.