Apparatus and method for semi distributed resource allocation in a cognitive radio wireless communication system
First Claim
1. A method of operating a User Terminal (UT) in a Cognitive Radio (CR) wireless communication system, the method comprising:
- determining whether a signal of a licensed system is detected in at least one frequency band used by the CR wireless communication system, wherein the licensed system is a system that has priority of the at least one frequency band;
when the signal of the licensed system is detected, determining, by a controller, a per-subcarrier Transmit (Tx) power according to a water filling mechanism in such a manner that a sum rate is maximized without exceeding a current maximum Tx power;
upon receiving a binary message requesting to regulate the maximum Tx power from a Base Station (BS), determining, by the controller, a Penalty Factor (PF) based on at least one of the current maximum Tx power, the per-subcarrier Tx power, a per-subcarrier data rate, a minimum required data rate, and a threshold coefficient for a maximum allowed data rate; and
regulating a new maximum Tx power by multiplying the PF by the current maximum Tx power.
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Accused Products
Abstract
An apparatus and operation method of a Base Station (BS) for allocating a radio resource in a Cognitive Radio (CR) wireless communication system includes, when a licensed system is activated, determining whether each of User Terminals (UTs) located in a cell satisfies Quality of Service (QoS). If all of the UTs satisfy the QoS, a binary message indicating ‘on’ is broadcasted to neighbor BSs. If at least one of the UTs does not satisfy the QoS, a binary message indicating ‘off’ is broadcasted to the neighbor BSs, and when the binary message indicating ‘off’ is received from at least one of the neighbor BSs, the binary message indicating ‘off’ is broadcasted to the UTs.
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Citations
20 Claims
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1. A method of operating a User Terminal (UT) in a Cognitive Radio (CR) wireless communication system, the method comprising:
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determining whether a signal of a licensed system is detected in at least one frequency band used by the CR wireless communication system, wherein the licensed system is a system that has priority of the at least one frequency band; when the signal of the licensed system is detected, determining, by a controller, a per-subcarrier Transmit (Tx) power according to a water filling mechanism in such a manner that a sum rate is maximized without exceeding a current maximum Tx power; upon receiving a binary message requesting to regulate the maximum Tx power from a Base Station (BS), determining, by the controller, a Penalty Factor (PF) based on at least one of the current maximum Tx power, the per-subcarrier Tx power, a per-subcarrier data rate, a minimum required data rate, and a threshold coefficient for a maximum allowed data rate; and regulating a new maximum Tx power by multiplying the PF by the current maximum Tx power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A User Terminal (UT) apparatus in a Cognitive Radio (CR) wireless communication system, the apparatus comprising:
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a controller configured to determine whether a signal of a licensed system is detected in at least one frequency band used by the CR wireless communication system, wherein the licensed system is a system that has priority of the at least one frequency band; wherein the controller further is configured to; determine a per-subcarrier Transmit (Tx) power according to a water filling mechanism in such a manner that a sum rate is maximized without exceeding a current maximum Tx power when the signal of the licensed system is detected, determine, upon receiving a binary message requesting to regulate the maximum Tx power from a Base Station (BS), a Penalty Factor (PF) based on at least one of the current maximum Tx power, the per-subcarrier Tx power, a per-subcarrier data rate, a minimum required data rate, and a threshold coefficient for a maximum allowed data rate, and regulate a new maximum Tx power by multiplying the PF by the current maximum Tx power. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification