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Independently Managing Wireless Transmission By Individual Spectrum Access Systems In A Shared Radio Frequency Spectrum
Published Patent Application Numer: 2021/0385664 A1
Abstract
The invention is a new method for protecting an incumbent in shared radio frequency spectrum from aggregate interference exceeding a specified percentile from emitters managed by multiple Spectrum Access Systems (SASs). The current state of the art is for each SAS to exchange detailed information on the emitters it manages with every other SAS on a regular (daily) basis. With a global picture of all emitters, each SAS then uses a common algorithm to determine which emissions would have to be suspended to protect a geographic area from excessive aggregate interference. The new method (the invention) allows each SAS to calculate its own list of emitters to suspend without detailed knowledge of the other SAS’s emitters, with a guarantee that a specified percentile of the aggregate of all SASs’ managed emissions will not exceed a threshold. It represents a significant simplification over the current method and offers flexibility to each SAS to independently manage its emitters.
patent description
The invention is a new method for protecting an incumbent in shared radio frequency spectrum from aggregate interference exceeding a specified percentile from emitters managed by multiple Spectrum Access Systems (SASs). The novelty of this method is that each SAS can independently determine which of its emitters to suspend without exchanging detailed information with the other SASs. The invention uses a bound on the cumulative distribution function of the stochastic aggregate interference and partitioning of the overall interference budget among the SASs. There is a tradeoff in terms of spectral efficiency from using this method, but our preliminary tests of practical scenarios in the CBRS band shows this tradeoff to be small in most cases for moderate numbers of SASs.
Features
The current practice is for each SAS to exchange detailed information on the emitters it manages with every other SAS on a regular (daily) basis. With a global picture of all emitters, each SAS then uses a common, standardized algorithm to determine which emissions would have to be suspended to protect a geographic area from excessive aggregate interference. The invention allows each SAS to calculate its own list of emitters to suspend without detailed knowledge of the other SAS’s emitters, with a guarantee that a specified percentile of the aggregate of all SASs’ managed emissions will not exceed a threshold. It does so without requiring each SAS to share potentially sensitive information on its customers with other SASs, and without requiring that they use a common algorithm, and offers flexibility to each SAS to independently manage its emitters provided it does not exceed its allotted interference budget.