Method for database driven channel quality estimation in a cognitive radio network
First Claim
1. A method of predicting an available link budget information for a secondary device operating in a spectrum of a primary system, the method comprising:
- gathering operating characteristics of the primary system and at least one of a plurality of secondary devices in a geo-location database, wherein the operating characteristics comprise at least a transmitter splatter level, transmitter location, antenna height, and antenna pattern, for the primary system and the at least one secondary device;
computing, based on the operating characteristics in the geo-location database, an allowed transmission power level at a first location for a specified operating frequency of a first secondary device of the plurality of secondary devices, wherein the allowed transmission power level is computed based on allowable harmful interference levels to the primary system and proximity of the first secondary device to the primary system;
predicting, based on the operating characteristics in the geo-location database, an aggregate interference level at a second location for the specified operating frequency of a second secondary device of the plurality of secondary devices;
predicting an available link budget at the second location for the specified operating frequency based on the difference between the computed allowed transmission power level at the first location and the aggregate interference level at the second location.
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Accused Products
Abstract
A method of determining operating parameters for a secondary system transmitter is described. The transmitter characteristics, including location and operating frequency band, are provided to a geo-location database. The database determines the maximum allowable transmission power that meets various specifications for different channels and conveys the power and channel(s) to the transmitter. The database estimates channel incumbent signal strengths based on the transmitter location and primary and higher-priority secondary incumbent systems, estimates the splatter levels, determines whether adjacent and co-channel interference protection ratios are met, and adjusts the allowable power level accordingly. The database also estimates aggregate co- and adjacent channel primary and secondary incumbent system interference levels at the transmitter location and predicts channel quality for each allowable channel. The estimated levels are updated using measurements of actual levels at the transmitter location. The database dynamically allocates channels using the secondary system priorities.
72 Citations
24 Claims
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1. A method of predicting an available link budget information for a secondary device operating in a spectrum of a primary system, the method comprising:
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gathering operating characteristics of the primary system and at least one of a plurality of secondary devices in a geo-location database, wherein the operating characteristics comprise at least a transmitter splatter level, transmitter location, antenna height, and antenna pattern, for the primary system and the at least one secondary device; computing, based on the operating characteristics in the geo-location database, an allowed transmission power level at a first location for a specified operating frequency of a first secondary device of the plurality of secondary devices, wherein the allowed transmission power level is computed based on allowable harmful interference levels to the primary system and proximity of the first secondary device to the primary system; predicting, based on the operating characteristics in the geo-location database, an aggregate interference level at a second location for the specified operating frequency of a second secondary device of the plurality of secondary devices; predicting an available link budget at the second location for the specified operating frequency based on the difference between the computed allowed transmission power level at the first location and the aggregate interference level at the second location. - View Dependent Claims (2, 3, 4, 5, 6, 19, 21, 23, 24)
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7. A method of determining operating characteristics for secondary system usage in a network containing a geo-location database, a primary incumbent system and secondary devices, the database containing information of the primary incumbent system and secondary devices including locations of transmitters and receivers of the primary incumbent system and locations of the secondary devices, the method comprising:
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determining a first location of a secondary transmitter; providing to the database transmitter information including the first location of the secondary transmitter and a frequency band of operation of the secondary transmitter; the database; determining an allowable transmission power at the first location of the secondary transmitter for a channel in the frequency band of operation to meet interference tolerance specifications at the location of at least one of the primary receivers, wherein determining the allowable transmission power of the secondary transmitter is based on the transmitter location, a transmitter splatter level, antenna height, and antenna pattern, for the primary and secondary transmitters, further wherein the allowable transmission power is determined based on allowable harmful interference levels to the primary incumbent system and proximity of the secondary transmitter to the primary system; indicating the allowable transmission power level and an allowable transmission channel in the frequency band of operation for the first location of the secondary transmitter to the secondary transmitter; predicting an aggregate interference level at a second location of a secondary receiver based on on-channel and off-channel emissions of the primary and secondary transmitters; and predicting an available link budget for the channel at the second location of the secondary receiver based on the difference between the allowable transmission power level at the first location and the predicted aggregate interference level at the second location. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22)
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Specification