Apparatus and method for joint power control in a wireless communication system
First Claim
1. A method for controlling power in a cognitive radio wireless communication system, the method comprising:
- selecting a plurality of customer premise equipments of the cognitive radio wireless communication system wherein the plurality of customer premise equipments affect an incumbent system different than the cognitive radio wireless communication system;
allocating a transmit power of each of the selected customer premise equipments;
calculating an interference level of each of the selected customer premise equipments using the transmit power of each of the selected customer premise equipments and a path loss of each of the selected customer premise equipments according to a distance between the each customer premise equipment and a protected contour of the incumbent system; and
calculating a total interference level affecting the incumbent system by summing the interference levels of the selected customer premise equipments.
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Abstract
An apparatus and a method for joint power control in a wireless communication system are provided, in which customer premise equipments to be serviced are selected by scheduling, upon receipt of service requests from the customer premise equipments, the interference level of each of the selected customer premise equipments that affects an incumbent system is calculated, a total interference level affecting the incumbent system is calculated by summing the interference levels of the selected customer premise equipments, and a transmit power of the each customer premise equipment is reduced, if the total interference level is larger than a threshold.
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Citations
24 Claims
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1. A method for controlling power in a cognitive radio wireless communication system, the method comprising:
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selecting a plurality of customer premise equipments of the cognitive radio wireless communication system wherein the plurality of customer premise equipments affect an incumbent system different than the cognitive radio wireless communication system; allocating a transmit power of each of the selected customer premise equipments; calculating an interference level of each of the selected customer premise equipments using the transmit power of each of the selected customer premise equipments and a path loss of each of the selected customer premise equipments according to a distance between the each customer premise equipment and a protected contour of the incumbent system; and calculating a total interference level affecting the incumbent system by summing the interference levels of the selected customer premise equipments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for controlling power in a cognitive radio wireless communication system, the apparatus comprising:
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a scheduler configured to select a plurality of customer premise equipments of the cognitive radio wireless communication system wherein the plurality of customer premise equipments affect an incumbent system different than the cognitive radio wireless communication system; a power controller configured to allocate a transmit power of each of the selected customer premise equipments; and a path loss calculator configured to calculate an interference level for each of the selected customer premise equipments using the transmit power of each of the selected customer premise equipments and a path loss of each of the selected customer premise equipments according to a distance between the each customer premise equipment and a protected contour of the incumbent system, and calculate a total interference level that reaches a protected contour of the incumbent system using the interference levels of the selected customer premise equipments; the power controller further configured, when the total interference level is larger than a threshold, to reduce a transmit power of the customer premise equipment. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for controlling power in a cognitive radio wireless communication system, the method comprising:
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calculating an interference level of each of a plurality of base stations of the cognitive radio wireless communication system that affects an incumbent system different than the cognitive radio wireless communication system, using a transmit power of each of the base stations and a path loss of each of the base stations according to a distance between the each base station and a protected contour of the incumbent system; calculating a total interference level affecting the incumbent system by summing the interference levels of the base stations; and reducing a transmit power of at least one of the base stations, when the total interference level is larger than a threshold. - View Dependent Claims (22)
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23. A method for controlling power in a cognitive radio wireless communication system, the method comprising:
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acquiring an interference level of each of neighboring base stations of the cognitive radio wireless communication system adjacent to a first base station, the interference level affecting an incumbent system different than the cognitive radio wireless communication system, the interference level calculated using a transmit power of each of the neighboring base stations and a path loss of each of the neighboring base stations according to a distance between the each neighboring base station and a protected contour of the incumbent system; calculating a total interference level affecting the incumbent system by summing the interference level of the first base station and interference levels of the neighboring base stations; and reducing a transmit power of each of the first base station and the neighboring base stations, when the total interference level is larger than a threshold. - View Dependent Claims (24)
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Specification