Distributed Radio Unit Architecture for MIMO Capacity
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Solution Overview
Problem
Current communication base station configurations, which combine digital and radio signal processing units in a single physical system, limit the optimization of cell design and maximize system capacity, necessitating a novel structure and transmission method to enhance radio capacity.
Innovation Solution
A signal processing system comprising a digital unit connected to a core system and multiple radio units using MIMO transmission with two antennas, where the digital unit controls the transmission of reference signals based on signal strength differences to determine terminal location and allocate resources accordingly, using cell-specific or user-specific reference signals depending on the terminal's position within a cell or at the boundary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single base station includes both digital signal processing unit and radio signal processing unit in one physical system, then the system structure is simple, but cell design optimization is limited and system capacity cannot be maximized
Solution Approach 1:
The base station is segmented into a digital unit and multiple radio units that are physically separated. The digital unit handles digital signal processing while radio units handle radio frequency operations. This segmentation allows independent optimization of each component and enables multiple antennas to be connected to a single base station, thereby improving cell design optimization and system capacity while maintaining structural simplicity through modular architecture.
2Area of stationary object
If multiple antennas are connected to a single base station to improve cell design, then cell coverage is improved, but system capacity cannot be maximized
Solution Approach 1:
The system dynamically adapts reference signal transmission based on terminal location. Terminals in cell boundary areas receive different reference signals than those in cell centers. This dynamic adaptation enables the system to simultaneously maintain good cell coverage and maximize system capacity by optimizing resource allocation and reference signal usage according to terminal positions, thereby resolving the contradiction between coverage improvement and capacity maximization.
3Ease of operation
If cell-specific reference signals are used for all terminals, then transmission is simplified, but channel prediction accuracy deteriorates for terminals in cell boundary areas
Solution Approach 1:
The system applies different reference signal transmission strategies to different spatial locations. Terminals in cell boundary areas receive user-specific reference signals for accurate channel prediction, while terminals in cell centers receive cell-specific reference signals for simplified transmission. This local differentiation ensures that each terminal receives the appropriate reference signal type based on its location, thereby maintaining both transmission simplicity and channel prediction accuracy.
Data Source
AI summary
A signal processing system and a signal processing method are provided.The signal processing system includes: a digital unit connected to a core system and configured to process a radio digital signal; and a plurality of radio units physically separated from the digital unit, configured to convert and amplify a digital signal received from the digital unit and transmit the amplified signal to a terminal based on a multi-input multi-output (MIMO) transmission using two antennas, and receive a signal transmitted from a terminal based on MIMO using the two antennas and deliver the received signal to the digital unit, wherein two radio units, among the plurality of radio units, transmit data signals by using a cell-specific reference signal to a terminal located within a cell, rather than being located in a cell boundary area, under the control of the digital unit, and with respect to a terminal located in the cell boundary area and adjacent to a cell, a radio unit of the adjacent cell transmits a data signal by using a user-specific reference signal to the terminal.