Distributed Antenna System Dynamic Sectorization
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Solution Overview
Problem
Distributed antenna systems (DAS) face challenges in efficiently managing traffic loads across multiple sectors and MIMO systems, leading to underutilization of bandwidth and increased costs due to the need for multiple optical fibers.
Innovation Solution
Implementing a dynamic sectorization structure using dense wavelength division multiplexers (DWDM) and sector selectors to dynamically share bandwidth and capacity between sectorized base stations, allowing for optimized signal distribution over a reduced number of optical fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple optical fibers are used to support multi-sector and MIMO systems, then signal distribution capacity is improved, but system cost and complexity increase
Solution Approach 1:
The patent combines multiple optical signals carrying different sector data into a single optical fiber using wavelength division multiplexing (WDM). Each sector's data is modulated onto a different wavelength, allowing concurrent transmission of multiple sector signals through the same physical medium, thereby reducing the number of optical fibers required while maintaining full multi-sector functionality
Solution Approach 2:
The system enables a single optical fiber to perform multiple functions by simultaneously carrying data for multiple sectors through different wavelengths. The optical infrastructure becomes universal, serving all sectors through one fiber rather than requiring dedicated fibers for each sector, thus reducing both quantity and complexity
2Productivity
If bandwidth is dynamically shared between sectors, then capacity utilization is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic bandwidth sharing where the system can flexibly allocate wavelength resources between different sectors based on real-time traffic demands. The wavelength assignment is not fixed but can be dynamically reconfigured, allowing sectors to borrow bandwidth from others when needed, thereby maximizing overall capacity utilization while maintaining manageable complexity through standardized control mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances signal distribution and capacity utilization across the system, reducing the need for multiple optical cables and associated expenses, while ensuring efficient traffic management and peak usage handling.
Implementation Method 1
utilizing wavelength division multiplexing (WDM), and in particular dense wavelength division multiplexing (DWDM)
Data Source
AI summary
A distributed antenna system includes a plurality of remote units configured to service different regions of a service area, and a head-end unit configured to process and transmit downlink signals from base stations to the remote units over optical cables, and to process and transmit uplink signals from the remote units to the base stations, wherein the remote units are configured to adjust or filter a level of downlink signals from the head-end unit and to transmit the adjusted or filtered downlink signals to mobile stations, and to process and transmit uplink signals from mobile stations to the head-end unit over the optical cables.