Elevated Base Station Site Survey Using Beam-Forming Antennas
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Solution Overview
Problem
Conventional site survey equipment is inadequate for evaluating large dimensions of cell coverage (20-75 km) in rural areas, making it costly and inefficient to deploy wireless base stations, particularly in remote regions with sparse population density and rugged terrain.
Innovation Solution
A method and system involving a ground unit with a directionally adjustable beam-forming antenna that transmits wireless signals in N uniformly separated beam directions, received and measured by an elevated unit, allowing for complex power summation and power azimuth angular spectrum determination to assess suitability for high-elevation base station deployments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional base stations are placed on 30-40 meters standard height towers, then coverage can be provided to rural regions, but the cost of deployment becomes very high requiring several towers
Solution Approach 1:
The patent transitions from horizontal distribution of multiple standard-height towers to a vertical dimension solution by deploying a single elevated base station at heights of 100-1000 meters. This dimensional change allows one high-altitude station to cover the same area that would otherwise require multiple ground-level towers, directly resolving the contradiction between coverage area and quantity of base stations.
2Length of stationary object
If base stations are elevated to greater heights, then propagation range is improved to 20-75 km, but site survey equipment is inadequate for evaluating such large dimensions
Solution Approach 1:
The patent segments the site survey process into two parts: a ground-based unit that transmits reference signals, and an elevated unit that measures received signal characteristics. This segmentation allows the survey equipment to be divided between accessible ground locations and the elevated deployment position, making it feasible to evaluate large propagation ranges without requiring complete survey equipment at extreme heights.
Solution Approach 2:
The ground-based survey unit acts as an intermediary between the elevated base station and conventional measurement equipment. It transmits reference signals that enable characterization of the propagation channel between ground and elevated positions, effectively bridging the gap between limited ground-based equipment capabilities and the need to evaluate long-range propagation characteristics.
3Quantity of substance
If elevated base stations serve greater capacity, then demand can be satisfied, but angular spread is reduced requiring high order sectorization
Solution Approach 1:
The patent employs adaptive high-order sectorization where the base station dynamically adjusts beam directions and sector configurations based on measured angular spread characteristics. This dynamic adaptation allows the system to optimize service capacity for different user distributions and channel conditions, managing the complexity through intelligent control rather than fixed static configurations.
4Quantity of substance
If fewer elevated base stations are deployed, then total cost of ownership is reduced, but site survey tools are lacking for larger dimensions
Solution Approach 1:
The patent creates a multi-functional site survey system where the ground-based unit serves dual purposes: it functions as both a conventional ground station and as a reference transmitter for elevated base station characterization. This universal equipment can perform multiple functions including propagation measurement, angular spread characterization, and system calibration, eliminating the need for specialized survey tools for each function.
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
Enables efficient site surveying for high-elevation base stations, reducing the number of deployed units and lowering operational costs by providing improved propagation range and capacity, while supporting adaptive high-order sectorization and optimal tower placement without requiring existing tower infrastructure.
Implementation Method 1
transmitting, by a ground unit, wireless signals while a directionally adjustable beam-forming antenna of the ground unit changes a beam direction of the transmission of the wireless signals to N beam directions
Implementation Method 2
receiving and measuring, by an elevated unit, a magnitude and phase of the wireless signals transmitted by the ground unit through the N beam directions
Implementation Method 3
determining a receive power summation comprising performing a complex summation of the N complex receive power representations
Data Source
AI summary
Apparatuses, methods, and systems for surveying a site are disclosed. One method includes transmitting, by a ground unit, wireless signals while a directionally adjustable beam-forming antenna of the ground unit changes a beam direction of the transmission of the wireless signals to N beam directions, wherein the directionally adjustable beam-forming antenna includes a known motion, receiving and measuring, by an elevated unit, a magnitude and phase of the wireless signals transmitted by the ground unit through the N beam directions, determining N complex receive power representations wherein each complex receive power representation includes the measured magnitude and phase of the received wireless signals corresponding with each of the N beam directions, and determining a receive power summation comprising performing a complex summation of the N complex receive power representations.