Distributed Antenna System Synchronization for Multi-Service Integration
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Solution Overview
Problem
Distributed Antenna Systems (DAS) face challenges in supporting multiple wireless services due to the need for separate, dedicated Base Transceiver Stations (BTS) for each service, leading to high costs and complexity in installation and maintenance.
Innovation Solution
A DAS architecture that integrates a GPS receiver or envelop detector to provide a 1 pulse per second (1 pps) synchronization signal, allowing multiple wireless services to share the same physical infrastructure, with a centralized management system monitoring and configuring all active elements, and using a reference clock signal to synchronize components, thereby reducing the need for multiple BTS devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate dedicated BTS devices are used for each wireless service, then service reliability and performance are improved, but device complexity and installation costs increase
Solution Approach 1:
The patent combines multiple wireless services (cellular, WiFi, WiMAX, etc.) onto a single shared physical infrastructure including common antennas, transmission lines, and wiring closets. This merging approach maintains service reliability through dedicated logical channels while reducing overall device complexity by eliminating the need for separate BTS hardware for each service type.
Solution Approach 2:
The patent creates a universal DAS platform that can simultaneously support multiple wireless services and frequency bands through a single infrastructure. The system uses universal components like broadband antennas and multiplexers that can handle different service types (TDD, FDD, licensed, unlicensed) through configuration rather than requiring service-specific hardware, thereby reducing device complexity while maintaining multi-service reliability.
2Reliability
If multiple dedicated BTS devices are deployed for different wireless services, then service performance is improved, but installation and maintenance costs increase
Solution Approach 1:
The patent merges multiple service delivery functions into a single shared infrastructure, consolidating antennas, transmission media, and wiring closet equipment. This reduces the total number of hardware units that need to be installed and maintained, directly lowering installation and maintenance costs while preserving service performance through proper signal management and isolation.
Solution Approach 2:
The patent implements universal infrastructure components that can serve multiple services simultaneously. The broadband antennas, multiplexers, and switch fabric can be configured to support different wireless standards and frequency bands, eliminating the need for service-specific hardware installations and reducing ongoing maintenance requirements across multiple device types.
3Device complexity
If a single antenna is used to radiate signals for all services and frequency bands, then device complexity is reduced, but antenna design and performance requirements become more stringent
Solution Approach 1:
The patent merges multiple service signals onto common antennas through the use of multiplexers and frequency division techniques. This allows a single antenna to efficiently handle multiple services by separating them in the frequency domain, reducing overall device complexity while managing antenna design requirements through systematic signal management.
Solution Approach 2:
The patent employs universal broadband antennas designed to operate across wide frequency ranges (e.g., 400 MHz to 6 GHz) to support multiple services. These antennas incorporate design features like wideband matching networks and polarization diversity to maintain acceptable performance across all required bands, making the antenna subsystem universally applicable to different services without requiring service-specific antenna designs.
Data Source
AI summary
A system for supporting multiple time division duplexed (TDD) based wireless services or frequency division duplexed (FDD) wireless services on a Distributed Antenna System (DAS). TDD based services use a common clock signal to synchronize the components of the DAS for transmission and reception of TDD signals. The DAS includes a GPS receiver which extracts a timing signal from a GPS signal and distribute the timing signal to components of the DAS to enable synchronization of the components for transmitting and receiving TDD signals. The GPS receiver can be part of the interface that connects a TDD based service to the DAS. The DAS distributes a reference clock signal to the DAS components to maintain zero frequency shift while manipulating with the carrier frequencies of the various wireless services carried by the DAS.