Method for addressing user location errors in a cognitive radio system
First Claim
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1. A method of utilizing a geo-location database to avoid interference from a cognitive radio (CR) unit to at least one primary incumbent system, comprising:
- estimating, at the CR unit, an Operational Location Uncertainty region for the CR unit, wherein the Operational Location Uncertainty Region comprises a plurality of location points, wherein estimating further comprises;
estimating an operating location for the CR unit;
estimating an operating location estimate accuracy for the estimated operating location;
providing an allowed location determination error for the CR unit by a regulatory authority; and
wherein an Allowed Location Error Region is determined as being centered on the operating location of the CR unit, and extends outward to a distance equal to the difference between the allowed location determination error and the operating location estimate accuracy;
deriving, from the geo-location database, a plurality of location-based system operating parameters that are capable of avoiding interference to the at least one primary incumbent system, wherein the geo-location database represents each of the plurality of location points in the Operational Location Uncertainty Region by a corresponding location-based system operating parameter;
examining the corresponding location-based system operating parameter at each of the plurality of location points in the Operational Location Uncertainty Region to determine a location-based system operating parameter from among the plurality of location points; and
operating the CR unit with the determined location-based system operating parameter that avoids interference to the at least one primary incumbent system, and further comprising;
determining an updated location-based system operating parameter by selecting a maximum location-based system operating parameter from among a plurality of location points over the Allowed Location Error Region, wherein a location point corresponding to a center of the Allowed Location Error Region is a location point corresponding to a minimum location-based system operating parameter selected from among the plurality of location points in the Operational Location Uncertainty Region; and
operating the CR unit using the updated location-based system operating parameter.
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Abstract
A cognitive radio (CR) system (102) includes CR units (108, 110) that determine and update location-based system operating parameters to avoid interference with other systems operating in the same frequency band. Operational Location Uncertainty region and Allowed Location Error regions can be applied. The CR unit trades off between both, available channels and maximum system operating parameters, such that as Location Uncertainty of the CR device increases, available CR channels and location-based CR system operating parameters decrease over a maximum network reach.
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Citations
32 Claims
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1. A method of utilizing a geo-location database to avoid interference from a cognitive radio (CR) unit to at least one primary incumbent system, comprising:
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estimating, at the CR unit, an Operational Location Uncertainty region for the CR unit, wherein the Operational Location Uncertainty Region comprises a plurality of location points, wherein estimating further comprises; estimating an operating location for the CR unit; estimating an operating location estimate accuracy for the estimated operating location; providing an allowed location determination error for the CR unit by a regulatory authority; and wherein an Allowed Location Error Region is determined as being centered on the operating location of the CR unit, and extends outward to a distance equal to the difference between the allowed location determination error and the operating location estimate accuracy; deriving, from the geo-location database, a plurality of location-based system operating parameters that are capable of avoiding interference to the at least one primary incumbent system, wherein the geo-location database represents each of the plurality of location points in the Operational Location Uncertainty Region by a corresponding location-based system operating parameter; examining the corresponding location-based system operating parameter at each of the plurality of location points in the Operational Location Uncertainty Region to determine a location-based system operating parameter from among the plurality of location points; and operating the CR unit with the determined location-based system operating parameter that avoids interference to the at least one primary incumbent system, and further comprising; determining an updated location-based system operating parameter by selecting a maximum location-based system operating parameter from among a plurality of location points over the Allowed Location Error Region, wherein a location point corresponding to a center of the Allowed Location Error Region is a location point corresponding to a minimum location-based system operating parameter selected from among the plurality of location points in the Operational Location Uncertainty Region; and operating the CR unit using the updated location-based system operating parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 31, 32)
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11. A cognitive radio (CR) communication network, comprising:
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a CR base station located within a network Location Uncertainty Region, the CR base station having an estimated maximum network reach and further storing a geo-location database comprising CR system operating parameters; a prospective subscriber CR device, the prospective subscriber CR device having an Allowed Location Error Region about its center; and the prospective subscriber CR device increasing its Location Uncertainty about the network Location Uncertainty Region in exchange for a decrease in available channels from the CR base station and a decrease in transmit power from the CR base station; wherein the CR base station accesses the geo-location database to derive CR system operating parameters that are capable of avoiding interference to at least one primary incumbent system and further wherein the CR base station examines the derived CR system operating parameters by applying a maximization technique for trading off the Location Error Region for maximum allowed system operating parameters and applying a minimization technique for trading off the Location Uncertainty Region for minimum allowed system operating parameters to utilize a least amount of transmit power for communicating with the prospective subscriber device while avoiding interference to the at least one primary incumbent system; and
,the network Location Uncertainty Region and Allowed Location Error Region being updated in response to an update in the location of the subscriber CR device; and the CR system operating parameters being updated in response to the update in the at Allowed Location Error Region or Location Uncertainty Region; and the prospective subscriber CR device being operated with the updated location-based system operating parameters that avoid interference to the at least one primary incumbent system. - View Dependent Claims (12)
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13. A method of updating a cognitive radio (CR) location-based operating parameters for communicating within a CR communication network comprising:
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determining, at the CR unit, an Allowed Location Error Region for the CR unit, wherein the Allowed Location Error Region comprises a plurality of location points; determining, at the CR unit, an Operational Location Uncertainty Region of the CR unit, wherein the Operational Location Uncertainty Region comprises a plurality of location points; deriving, from a geo-location database, a plurality of location-based system operating parameters that are capable of avoiding interference to at least one primary incumbent system, wherein the geo-location database represents each location point in the Allowed Location Error Region and the Operational Location Uncertainty Region by a corresponding location-based system operating parameter; examining the corresponding location-based system operating parameter at each of the plurality of location points in the operational Location Uncertainty Region to determine a minimum location-based system operating parameter from among the plurality of location points, wherein a location point corresponding to a center of the Allowed Location Error Region is a location point corresponding to the minimum location-based system operating parameter; examining the corresponding location-based system operating parameter at each of the plurality of location points in the Allowed Location Error Region to determine a maximum location-based system operating parameter from among the plurality of location points; updating the CR location-based system operating parameters with the maximum location-based system operating parameter; and operating the CR unit with the maximum location-based system operating parameter that avoids interference to the at least one primary incumbent system. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A cognitive radio (CR) device, comprising:
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a transmitter; a controller coupled to the transmitter, the controller and transmitter maintaining a geo-location database comprising system operating parameters for the CR device; and the CR device operating within an Operation Location Uncertainty region comprising a plurality of location points, and the CR device having an Allowed Location Error Region about its center, the CR device accessing the geo-location database to derive CR system operating parameters that are capable of avoiding interference to at least one primary incumbent system and further trading off between both available channels and maximum system operating parameters, such that as Location Uncertainty of the CR device increases, available CR channels and CR system operating parameters decrease, wherein the CR device is operated with the decrease in CR system operating parameters that avoid interference to the at least one primary incumbent system; wherein the derived CR system operating parameters correspond to transmit power levels, and further wherein the maximum system operating parameters include a maximum allowable transmit power level that is determined as a maximum of a plurality of transmit power levels from among the plurality of location points in the Allowed Location Error Region, and further wherein the minimum allowed system operating parameters include a least amount of transmit power level that is determined as a minimum of a plurality of transmit power levels from among the plurality of location points in the Operation Location Uncertainty Region; and the Location Uncertainty being updated based on updates to the location of the CR device, and the CR system operating parameters being updated in response to the update in the Location Uncertainty; and
the CR device being operated with the updated CR system operating parameters that avoid interference to the at least one primary incumbent system. - View Dependent Claims (20, 21)
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22. A method of communicating in a cognitive radio (CR) communication network having at least a mobile CR unit, comprising:
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at the mobile CR unit; estimating the location of the mobile CR unit; determining at least one of an Allowed Location Error Region or Operational Location Uncertainty Region for the CR unit, wherein the Allowed Location Error Region or the Operational Location Uncertainty Region comprises a plurality of location points— deriving, from a geo-location database, a plurality of location-based system operating parameters that is capable of avoiding interference to at least one primary incumbent system, wherein the geo-location database represents each location point in the Allowed Location Error Region or the Operational Location Uncertainty Region by a corresponding location-based system operating parameter, wherein each derived location-based system operating parameter corresponds to a transmit power level; examining the corresponding location-based system operating parameter at each of the plurality of location points either in the Allowed Location Error Region or Operational Location Uncertainty Region to determine a location-based system operating parameter from among the plurality of location points, wherein the step of examining, comprises; determining the Allowed Location Error Region for the CR unit and applying a maximization technique for trading off Location Error Region for maximum allowed system operating parameters, wherein the maximum allowed system operating parameters include a maximum allowable transmit power level that is determined as a maximum of a plurality of transmit power levels from among the plurality of location points in the Allowed Location Error Region; and determining the Operational Location Uncertainty Region for the CR unit and applying a minimization technique for trading off a Location Uncertainty Region for minimum allowed system operating parameters, wherein the minimum allowed system operating parameters include a least amount of transmit power level that is determined as a minimum of a plurality of transmit power levels from among the plurality of location points in the Operation Location Uncertainty Region; updating the at least one of Location Uncertainty Region and Location error Region based on an update in the location of the mobile CR unit; and updating the location-based system operating parameter in response to the update in the at least one of the Allowed Location Error Region or Operational Location Uncertainty Region; and operating the CR unit with the updated location-based system operating parameter that avoids interference to the at least one primary incumbent system. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification