Method and apparatus for optimizing spectrum utilization by a cognitive radio network
First Claim
1. A method for selecting a cognitive radio (CR) channel, comprising the steps at a CR mobile subscriber:
- scanning frequency bands to determine the availability of one or more CR base stations at the location of the CR mobile subscriber;
determining a transmit power level for each available CR base station;
measuring a received power level for each available CR base station;
computing an estimated link budget for each candidate channel, wherein the estimated link budget comprises a difference between the transmit power level of the CR base station and the corresponding measured received power level for the CR base station;
calculating required transmit power by the CR mobile subscriber to reach each CR base station and avoid interference to identified incumbents;
ranking the CR base stations based on the estimated link budget, required transmit power and maximum allowed transmit power level of the CR mobile subscriber;
selecting and utilizing a highest ranked CR base station and channel for transmission from the CR mobile subscriber; and
maintaining CR mobile subscriber communication by switching CR base stations in response to detected mobility of the CR mobile subscriber and further wherein the detected mobility meets a predefined criteria.
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Abstract
A technique for a secondary communication system to utilize spectrum designated to another (or primary) communication system is provided. By ranking a plurality of secondary base stations based on base station transmit power, calculated required transmit power and path loss, a set of criteria is developed for selecting a highest ranked secondary base station for operation within a primary'"'"'s spectrum. The ranking may be adapted based on mobility of the secondary'"'"'s subscriber; and as such the secondary system communicates within the primary'"'"'s spectrum using the adaptively ranked base stations. Channel selection may also be ranked. The technique and apparatus allows a cognitive radio (CR) network to operate within an incumbent network'"'"'s spectrum.
40 Citations
9 Claims
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1. A method for selecting a cognitive radio (CR) channel, comprising the steps at a CR mobile subscriber:
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scanning frequency bands to determine the availability of one or more CR base stations at the location of the CR mobile subscriber;
determining a transmit power level for each available CR base station;
measuring a received power level for each available CR base station;
computing an estimated link budget for each candidate channel, wherein the estimated link budget comprises a difference between the transmit power level of the CR base station and the corresponding measured received power level for the CR base station;calculating required transmit power by the CR mobile subscriber to reach each CR base station and avoid interference to identified incumbents;
ranking the CR base stations based on the estimated link budget, required transmit power and maximum allowed transmit power level of the CR mobile subscriber;selecting and utilizing a highest ranked CR base station and channel for transmission from the CR mobile subscriber; and maintaining CR mobile subscriber communication by switching CR base stations in response to detected mobility of the CR mobile subscriber and further wherein the detected mobility meets a predefined criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification