Compression Filter for Massive MIMO RRU-BBU Link Burden
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Solution Overview
Problem
Massive Multiple Input Multiple Output (MIMO) systems face challenges in managing high data throughput requirements due to the large number of antennas, leading to increased link burden between the Remote Radio Unit (RRU) and Baseband Unit (BBU) in thin base station architectures, which can result in inefficiencies and higher operational costs.
Innovation Solution
Implementing a channel estimation-based compression filter at the RRU to reduce the data streams from antenna-proportional to user-proportional, allowing for efficient data compression and transmission over the RRU-BBU interface, thereby alleviating the link burden without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large scale MIMO systems deploy 32 or 64 antennas to acquire spatial multiplexing and beamforming gain, then data transmission rates and user capacity are improved, but link burden between RRU and BBU increases significantly
Solution Approach 1:
The patent segments the data processing function by introducing a dedicated data compression unit at the RRU that operates independently from the BBU. This unit compresses data from multiple antennas before transmission, reducing the overall data throughput requirement on the RRU-BBU link while maintaining the productivity benefits of large scale MIMO
Solution Approach 2:
The patent extracts the data compression function from the BBU and places it at the RRU. This extraction allows the RRU to preprocess and compress data locally, removing the burden of transmitting full-precision data from all antennas to the BBU, thereby reducing link burden while preserving spatial multiplexing capabilities
2Reliability
If data from all antennas is transmitted to BBU without compression, then signal processing accuracy is maintained, but operational costs and link burden increase
Solution Approach 1:
The patent applies preliminary compression action at the RRU before data transmission to the BBU. The data compression unit performs compression in advance, reducing the data volume that needs to be transmitted and processed, thereby lowering operational costs while maintaining signal processing accuracy through controlled compression
Data Source
AI summary
A method of processing signals in a radio processing apparatus of a base station may include obtaining a plurality of aggregated data symbols, wherein each of the plurality of aggregated data symbols corresponds to a receive terminal of a plurality of receive terminals of the base station and is composed of transmitted data symbols from a plurality of transmit terminals; applying a compression filter to the plurality of aggregated data symbols to reduce the plurality of aggregated data symbols into a plurality of isolated data symbols, the compression filter being based on channel estimates between the plurality of receive terminals and the plurality of transmit terminals; and transmitting the plurality of isolated data symbols to a baseband processing apparatus of the base station.