Peripheral Base Station Antenna Radiation Pattern Modification
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Solution Overview
Problem
Satellite radiotelephone systems face challenges in densely populated areas due to signal blocking and penetration issues, leading to underutilization of satellite band spectrum, and existing dual mode systems are costly and inefficient due to duplication of components.
Innovation Solution
A communications system with a terrestrial network of base stations, including interior and peripheral stations, is designed to provide modified antenna radiation patterns and frequency reuse, allowing reduced interference and increased capacity by directing transmissions and receptions differently based on location and frequency usage, with some stations acting as receive-only to manage power and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terrestrial networks reuse satellite frequency bands in densely populated areas, then system capacity and economic viability are enhanced, but interference between terrestrial and satellite signals increases
Solution Approach 1:
The service area is divided into interior and peripheral portions, with different base station configurations deployed in each segment. Interior base stations provide full coverage while peripheral base stations use modified radiation patterns to reduce interference in specific directions, allowing frequency reuse while managing interference through spatial segmentation.
Solution Approach 2:
Different radiation pattern characteristics are applied to different locations. Peripheral base stations transmit signals with modified radiation patterns that provide greater power toward interior portions of the coverage area while reducing power away from interior portions, creating location-specific transmission characteristics that reduce interference in satellite frequency bands.
2Area of stationary object
If peripheral base stations transmit with equal power in all directions, then coverage area is maximized, but interference with satellite signals increases
Solution Approach 1:
The radiation pattern of peripheral base stations is modified to create non-uniform power distribution in different directions. Signals are transmitted with greater power toward interior portions of the coverage area where coverage is needed, and reduced power away from interior portions where interference with satellite signals occurs, achieving location-specific optimization.
Solution Approach 2:
The radiation pattern intentionally creates asymmetric power distribution rather than uniform omnidirectional transmission. The pattern is designed to be stronger in directions toward the interior coverage area and weaker in directions away from it, breaking the symmetry to reduce interference while maintaining necessary coverage.
3Reliability
If dual mode satellite and terrestrial systems are implemented, then service availability is improved, but system cost increases due to component duplication
Solution Approach 1:
The system merges satellite and terrestrial communication capabilities into a unified network architecture. Terrestrial base stations reuse satellite frequency bands and coordinate with satellite cells, combining the strengths of both systems while sharing infrastructure and reducing the need for separate dual-mode terminal hardware, thereby lowering overall system cost.
Solution Approach 2:
The terrestrial base stations are designed to perform multiple functions: providing coverage in densely populated areas, reusing satellite frequency bands, and coordinating with satellite cells. This multi-functionality reduces the need for separate specialized equipment and enhances service availability through a unified system rather than requiring duplicate satellite and terrestrial infrastructure.
Data Source
AI summary
A wireless communications system may include a terrestrial network including a plurality of base stations providing communications service for radioterminals over a terrestrial network coverage area. The plurality of base stations may include interior base stations providing communications service for radioterminals in an interior portion of the terrestrial network coverage area and peripheral base stations providing communications service for radioterminals at a peripheral portion of the terrestrial network coverage area. At least one of the peripheral base stations provides transmissions directed toward an interior portion of the terrestrial network coverage area with greater power than transmissions directed away from interior portions of the terrestrial network coverage area. Related methods are also discussed.