Baseband Unit and Remote Unit Architecture for Switched Ethernet RAN
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Solution Overview
Problem
The increasing demand for mobile data transmission and consistent RF coverage in densely populated areas, such as buildings, poses challenges for traditional Distributed Antenna Systems (DAS) in efficiently managing radio frequency signals and network capacity.
Innovation Solution
A communication system comprising remote units and a controller, where the remote units exchange RF signals with mobile devices and the controller, connected to an external network, performs real-time scheduling of data and compresses baseband data for transmission over an intermediate switched Ethernet network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional Distributed Antenna Systems (DAS) are used for RF signal distribution in buildings, then RF coverage can be provided, but network capacity and data transmission efficiency are limited
Solution Approach 1:
The system divides the base station functionality into separate Remote Units (RUs) distributed throughout the building and a centralized Controller Unit (CU). Each RU handles local RF signal transmission and reception, while the CU manages data processing and network connectivity. This segmentation enables improved data transmission capacity through centralized control while maintaining distributed RF coverage, directly resolving the contradiction between productivity and device complexity.
2Reliability
If more remote units are deployed to improve RF coverage in densely populated areas, then coverage quality increases, but network complexity and data handling requirements increase
Solution Approach 1:
Multiple Remote Units are merged under a single centralized Controller Unit, which aggregates data from all RUs and manages their coordination. This merging approach allows the system to deploy multiple RUs for improved RF coverage consistency while the centralized CU manages the complexity of coordinating these units, thus resolving the contradiction between reliability and device complexity.
3Productivity
If real-time data scheduling and compression are implemented at the controller, then network efficiency and data transmission capacity improve, but processing complexity increases
Solution Approach 1:
The Controller Unit performs data compression and scheduling in advance before transmitting data over the intermediate network to Remote Units. By conducting these processing operations preliminarily at the CU rather than in real-time at each RU, the system achieves improved network efficiency and data transmission capacity while concentrating the processing complexity in a single centralized location, thus resolving the contradiction between productivity and device complexity.
Data Source
AI summary
One embodiment is directed to a communication system comprising a plurality baseband units; and a plurality of remote units communicatively coupled to the baseband units using a switched Ethernet network. Each baseband unit is associated with a respective subset of the remote units. Each baseband unit is configured to communicate baseband data with the respective subset of the remote units associated with that baseband unit over the switched Ethernet network. Each baseband unit and remote unit is configured to perform at least some baseband processing associated with serving the respective cell. The communication system is configured so that one of the baseband units is a master baseband unit and is configured to transmit time stamp messages with the remote units associated with the master baseband unit and with the remote units associated with the other baseband units of the plurality of baseband units.