Distributed Antenna Host Architecture for Multi-Band RF Modularity
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Solution Overview
Problem
Existing distributed antenna systems (DAS) face challenges in efficiently managing and adapting to different wireless service providers, frequency bands, and communication protocols, leading to suboptimal performance and flexibility in wireless coverage.
Innovation Solution
A DAS design that integrates a host unit with a base station subsystem and a DAS subsystem, featuring a modular architecture with a baseband interface and switch, allowing for physical installation and removal of RF channel modules to support multiple service providers, frequency bands, and communication protocols, and enables concurrent operation on IP data and baseband digital signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a distributed antenna system uses a traditional host unit architecture, then the system structure is simple, but the system cannot efficiently manage and adapt to different wireless service providers, frequency bands, and communication protocols
Solution Approach 1:
The host unit is segmented into separate functional modules: a base station subsystem that handles baseband processing for multiple service providers, and a DAS subsystem that manages signal distribution. This modular architecture allows independent configuration of each module to support different frequency bands and protocols without redesigning the entire system.
Solution Approach 2:
The base station subsystem is designed with universal functionality to support multiple wireless service providers, frequency bands, and communication protocols simultaneously. The system can configure different RF channel modules to handle various standards (e.g., GSM, CDMA, LTE) through a single unified platform, eliminating the need for separate host units for each provider.
2Productivity
If the DAS system integrates base station and DAS subsystems separately, then each subsystem can be optimized independently, but the overall system coordination and signal flow management become complex
Solution Approach 1:
An intermediary interface is introduced between the base station subsystem and the DAS subsystem that standardizes signal exchange protocols. This intermediary layer handles the coordination and signal flow management, allowing each subsystem to be optimized independently while maintaining simple, standardized interactions through defined interfaces for baseband digital signal transmission.
3Adaptability or versatility
If RF channel modules are permanently installed in the host unit, then the system structure is stable, but the system cannot adapt to changing service provider requirements and frequency band needs
Solution Approach 1:
The RF channel modules are designed with dynamic installation and removal capabilities through hot-swappable connectors and modular bay structures. Modules can be dynamically added, removed, or replaced without powering down the system, allowing real-time adaptation to changing service provider requirements and frequency band allocations while maintaining system operational stability.
4Quantity of substance
If the system supports multiple frequency bands and protocols simultaneously, then the wireless coverage capacity increases, but the system resource management and interference coordination become difficult
Solution Approach 1:
The base station subsystem incorporates feedback mechanisms that continuously monitor signal quality, interference levels, and resource utilization across all active frequency bands and protocols. This feedback enables dynamic resource allocation and coordination, allowing the system to simultaneously support multiple services while automatically adjusting parameters to minimize interference and optimize performance for each band.
Data Source
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AI summary
One embodiment is directed to a distributed antenna system (DAS) including a host unit and a plurality of remote units. The host unit includes a plurality of base transceiver stations and a switch. Each of the base transceiver stations is configured to provide a downstream baseband digital signal to the switch and to receive an upstream baseband digital signal from the switch, wherein each downstream baseband digital signal and upstream baseband digital signal is a digital representation of the RF channel at baseband of the respective base transceiver station. The switch is configured to route each of the downstream baseband digital signals to a respective subset of the remote units as one or more downstream serial data streams and to route each of the upstream baseband digital signals from one or more upstream serial data streams to a respective subset of the base transceiver stations.