Backfire Distributed Antenna System Cell Isolation
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Solution Overview
Problem
Traditional cellular network strategies face challenges in providing consistent indoor coverage due to high penetration losses, high power load, and limited cell isolation, which degrade data throughput and increase soft handover zones, especially in high-traffic urban areas.
Innovation Solution
A distributed antenna system (DAS) with a host unit and remotely located antennas, configured in a backfire configuration to provide simultaneous coverage with delayed signal transmission, enhancing cell isolation and reducing interference through MIMO techniques like Space Time Coding and Spatial Multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcells are deployed in high traffic urban areas to provide deep indoor coverage, then coverage quality is improved, but cell isolation between neighboring cells deteriorates
Solution Approach 1:
The patent segments the coverage area into multiple microcells with carefully controlled spatial distribution. By dividing the large coverage area into smaller cells and strategically positioning them, the system achieves deep indoor coverage while maintaining adequate isolation between cells through optimized geometry and spacing.
Solution Approach 2:
The patent transitions from two-dimensional horizontal cell deployment to three-dimensional spatial distribution by deploying microcells at different heights and orientations. This vertical dimension provides additional isolation between neighboring cells while maintaining coverage quality, reducing interference through spatial separation in the third dimension.
2Productivity
If microcells are deployed with typical inter-site distances to boost capacity, then network capacity is improved, but soft handover zones increase loading the backhaul
Solution Approach 1:
The patent applies local quality by creating non-uniform cell geometry and varying inter-site distances based on local traffic patterns and building layouts. In high-traffic areas, cells are positioned to minimize overlap and reduce handover zones, while maintaining adequate coverage. This localized optimization reduces backhaul loading in critical areas while preserving network capacity.
3Area of stationary object
If neighbor cells operate on the same channel to provide coverage, then coverage area is improved, but signal to noise ratio deteriorates
Solution Approach 1:
The patent introduces physical barriers such as building structures, walls, and strategically positioned reflectors as intermediaries between neighbor cells. These intermediaries block or attenuate direct signal paths between cells operating on the same channel, reducing interference and improving signal-to-noise ratio while maintaining coverage area through indirect propagation paths.
Data Source
AI summary
A distributed antenna system (DAS) is provided, comprising a host unit and a plurality of remote placed to define a common coverage area. Each of the plurality of remote units is communicatively coupled to the host unit, points at least partially towards the common coverage area, and simulcasts data from the host unit.