Functional Split Data Transmission for C-RAN Bandwidth Constraints
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Solution Overview
Problem
The existing C-RAN architecture faces limitations in large-scale deployment due to bandwidth constraints of the CPRI interface between BBU and RRU, especially with high-bandwidth and massive MIMO technologies, requiring innovative functional split methods for efficient data transmission.
Innovation Solution
Implementing a data transmission method that processes radio frequency signals in multiple functional split manners, allowing the first communications apparatus to divide and process signals differently, and send them to the second communications apparatus for further processing, thereby optimizing the functional split and reducing the processing complexity and bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional CPRI interface is used for data transmission between BBU and RRU, then network deployment is simple, but bandwidth limitation prevents large-scale deployment with massive MIMO
Solution Approach 1:
The patent segments the baseband processing functions by dividing the frequency spectrum into multiple subcarriers and allocating different processing tasks to different units. The RRU performs processing on subcarriers while the BBU handles other subcarriers, effectively segmenting the overall processing load to bypass the CPRI bandwidth limitation.
Solution Approach 2:
The patent introduces a frequency-domain dimension to the functional split by processing different subcarriers at different locations. Instead of transmitting all data through the limited CPRI bandwidth, the system utilizes frequency diversity to distribute the data transmission across multiple frequency channels, thereby increasing the effective capacity.
2Quantity of substance
If functional split is implemented to meet high CPRI bandwidth requirement, then large-scale deployment is enabled, but processing complexity increases
Solution Approach 1:
The patent applies different processing qualities and complexities to different parts of the signal based on local requirements. Important subcarriers requiring high processing quality are handled by the BBU, while less critical subcarriers are processed at the RRU, creating a non-uniform processing distribution that balances complexity and performance.
3Device complexity
If all signals are processed in the same functional split manner, then processing is simplified, but bandwidth requirements cannot be optimized
Solution Approach 1:
The patent applies different processing qualities and complexities to different parts of the signal based on local requirements. Important subcarriers requiring high processing quality are handled by the BBU, while less critical subcarriers are processed at the RRU, creating a non-uniform processing distribution that balances complexity and performance.
Data Source
AI summary
Embodiments of this application relate to the communications field, and provide a data transmission control method. The method includes: obtaining, by the first communications apparatus, radio frequency signals; processing, by the first communications apparatus, at least two parts of signals in the radio frequency signals in at least two functional split manners, to generate at least two parts of transmission signals, where each part of signals in the radio frequency signals is processed in one functional split manner, and different parts of signals in the radio frequency signals are processed in different functional split manners; and sending, by the first communications apparatus, the at least two parts of transmission signals to the second communications apparatus.