Radio Unit Signal Transformation and Compression for Bandwidth Reduction

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Solution Overview

Problem

The rapid development of wireless communication technologies, particularly with the emergence of LTE and LTE-A, increases the bandwidth requirements between baseband processing units and remote radio units, leading to significant pressure on communication bandwidth, which existing systems struggle to manage without compromising Quality of Service.

Innovation Solution

Implementing a radio unit with a transformation unit to convert uplink time domain signals to frequency domain, followed by compression using a compression algorithm, and a decompression unit to handle downlink signals, thereby reducing data traffic and alleviating bandwidth pressure by transferring compressed signal data between the radio unit and the baseband processing unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the radio unit is remote from the baseband processing unit and they communicate via optical fiber, then long-range communication is enabled, but communication bandwidth pressure increases significantly with advanced technologies like LTE-A and MIMO

Engineering Contradiction:

Improvedistance between radio unit and baseband processing unitVSAvoidcommunication bandwidth

Core Design Contradiction:

Length of stationary objectVSQuantity of substance

Solution Approach 1:

The patent extracts the Fourier transformation function from the baseband processing unit and relocates it to the radio unit. This allows the radio unit to perform local signal transformation, reducing the amount of data that needs to be transmitted over the optical fiber connection, thereby alleviating bandwidth pressure while maintaining remote operation capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies compression algorithms to signal data before transmission between the radio unit and baseband processing unit. By compressing the data in advance, the transmission bandwidth requirement is reduced, enabling remote deployment without being constrained by bandwidth limitations

Inventive Principle:

Principle #10Preliminary action

2Reliability

If signal data is transmitted in time domain between radio unit and baseband processing unit, then complete signal information is preserved, but data traffic volume is large causing bandwidth pressure

Engineering Contradiction:

Improvesignal information completenessVSAvoiddata traffic volume

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent transforms signal data from time domain to frequency domain using Fourier transformation. This dimensional change in the signal representation allows for more efficient compression and processing, reducing data traffic volume while preserving essential signal characteristics needed for reliable communication

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS9220004B2Radio unit, baseband processing unit and base station system

Publication Date: 2015.12.22 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A radio unit configured to connect to a baseband processing unit includes a transformation unit configured to obtain uplink time domain signal data and transform the uplink time domain signal data into uplink frequency domain signal data; and a compression unit configured to compress the uplink frequency domain signal data by using a compression algorithm.