CBSD Location Determination Using Building Point Clouds
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Solution Overview
Problem
In shared spectrum systems, accurately determining the location of secondary user CBSDs within structures like buildings is challenging due to signal obstruction, leading to non-optimal transmission power assignments and increased interference with primary users and other CBSDs.
Innovation Solution
A program product that creates a point cloud of the structure, obtains absolute location data, and identifies CBSDs to determine their precise location, enabling optimal maximum transmit power allocation and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If CBSDs are deployed within buildings to provide coverage, then coverage area is improved, but location determination accuracy deteriorates due to signal obstruction
Solution Approach 1:
The patent introduces an intermediary system comprising a point cloud representation of the building structure and multiple reference points with known absolute locations. This intermediary framework mediates between the obstructed GNSS signals and the CBSDs, enabling accurate location determination through relative position calculations rather than direct satellite reception.
Solution Approach 2:
The patent replaces the direct GNSS satellite signal reception mechanism with an alternative localization mechanism based on structured environmental mapping and reference point relationships. This substitution eliminates dependency on unobstructed satellite signals while achieving comparable or superior location accuracy.
2Area of stationary object
If maximum transmission power is assigned to CBSDs to enhance coverage, then coverage area is improved, but interference to primary users and other CBSDs increases
Solution Approach 1:
The patent implements a feedback mechanism where the Spectrum Access System continuously receives location information from CBSDs and adjusts transmission power assignments based on real-time spatial relationships. This closed-loop control ensures that power levels are optimized for coverage while automatically reducing interference to primary users and other CBSDs.
Solution Approach 2:
The patent applies local quality optimization by assigning different transmission power levels to different CBSDs based on their specific locations, surrounding environment, and interference conditions. Rather than uniform power assignment, each CBSD receives customized power parameters tailored to its local operational context.
3Object-generated harmful factors
If transmission power is reduced to minimize interference, then interference to primary users is reduced, but CBSD coverage area is diminished
Solution Approach 1:
The patent employs dynamic power adjustment where transmission power levels are continuously adapted based on changing spatial relationships, primary user activity, and network conditions. This dynamic approach allows the system to maximize coverage when interference conditions permit while automatically reducing power when primary users are active nearby.
Data Source
AI summary
Techniques are provided for accurately determining actual and prospective location(s) of radio(s) located in a structure and controlled by a shared spectrum system. By more accurately knowing the location(s) of the radios, the shared spectrum system can more efficiently allocate maximum transmission power(s) to the radio(s), enhance corresponding radio coverage area(s), and/or diminish interference to other radio(s) and/or primary user(s).