Shared Spectrum Power Allocation via Interference Point Subsetting
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Solution Overview
Problem
The existing iterative allocation process (IAP) for determining transmit power levels in shared spectrum systems, particularly for Citizens Broadband Radio Service (CBRS), is time-consuming due to the sheer volume of CBSD-protection point pairs, especially when dealing with grandfathered wireless protection zones (GWPZ) and priority access licenses (PAL), and requires processing-intensive propagation models like ITM and eHata, which delay analysis.
Innovation Solution
A program product that reduces the number of points for interference margin allocation by determining a subset of points based on average land category and using appropriate propagation models, such as eHata and ITM, to efficiently calculate aggregate interference and maximum transmission power levels, thereby diminishing the need for extensive elevation data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the iterative allocation process (IAP) processes all CBSD-protection point pairs using propagation models like ITM and eHata, then the interference allocation is accurate and reliable, but the processing time and computational complexity increase significantly
Solution Approach 1:
The patent segments the set of protection points into two categories: (1) points that require propagation model calculations (ITM and/or eHata) based on specific criteria such as distance thresholds or terrain characteristics, and (2) points that can use simplified interference calculation methods. This segmentation allows the system to maintain accuracy for critical points while reducing overall processing time by excluding unnecessary points from intensive computation.
2Measurement precision
If multiple propagation models (ITM and eHata) are used to determine path loss for PPAs and GWPZs, then the path loss calculation is more accurate across different distance ranges, but the processing intensity and elevation data requirements increase
Solution Approach 1:
The patent applies different calculation methods to different locations based on local characteristics. Specifically, it identifies regions where propagation model calculations are necessary (e.g., areas with specific distance ranges or terrain features) and applies the appropriate models (ITM for certain conditions, eHata for others), while using simplified methods in other regions. This local quality approach ensures high accuracy where needed while reducing overall processing complexity.
Data Source
AI summary
Techniques are provided for efficiently determining power allocation of radios utilizing shared spectrum by enhancing processing efficiency for determining aggregate interference levels in a region of points where aggregate interference must not exceed a threshold level. Processing efficiency is achieved by techniques identifying a subset of points in the region at which analysis must be performed.