POWER CONTROL IN COGNITIVE RADIO SYSTEMS BASED ON SPECTRUM SENSING SIDE INFORMATION
First Claim
1. A method for controlling transmit power of a cognitive radio device sharing spectrum with a primary device without interfering with the primary device'"'"'s use of the spectrum, comprising:
- determining a parameter relating to a distance between a primary transmitter of the primary device and the cognitive radio device based on sensing information from a spectrum sensing process that senses the presence of the primary device on the spectrum based on signals emitted from the primary transmitter; and
dynamically controlling a transmit power of the cognitive radio device based on the parameter to fulfill a QoS requirement of the primary device.
3 Assignments
0 Petitions
Accused Products
Abstract
For cognitive radio systems, the transmit power of a cognitive radio device is controlled so that the cognitive, unlicensed radio device does not interfere with the use of a shared spectrum by a primary, licensed device. Controlling the transmit power includes determining a distance, or a function of the distance, between a primary transmitter of the primary device and the cognitive radio device based on sensing information from a spectrum sensing process. The maximum transmit power of the cognitive radio device is then dynamically controlled based on the distance, or the function of the distance, while considering a worst case scenario of an underlying cognitive radio model, to guarantee a quality of service requirement of the primary device.
-
Citations
20 Claims
-
1. A method for controlling transmit power of a cognitive radio device sharing spectrum with a primary device without interfering with the primary device'"'"'s use of the spectrum, comprising:
-
determining a parameter relating to a distance between a primary transmitter of the primary device and the cognitive radio device based on sensing information from a spectrum sensing process that senses the presence of the primary device on the spectrum based on signals emitted from the primary transmitter; and dynamically controlling a transmit power of the cognitive radio device based on the parameter to fulfill a QoS requirement of the primary device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A cognitive radio device employing spectrum sensing for sensing the presence of a primary device on a designated portion of a network spectrum based on signals emitted from a primary transmitter of the primary device, comprising:
-
a spectrum sensing component for sensing presence information about utilization of the designated portion of the network spectrum by the primary device, whereby the cognitive radio device shares the designated portion of the network spectrum with the primary device; and a power control component for controlling a transmission power of the cognitive radio device based on at least one output from the spectrum sensing component such that the use of the designated portion of the network spectrum by the cognitive radio device does not interfere with use by the primary device, wherein the power control component controls the transmit power based on a worst case location associated with the primary device in order to guarantee a QoS requirement of the primary device. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. A method for controlling power of a cognitive radio device in a cognitive radio system to prevent interference with licensed devices, comprising:
-
deriving at least one set of candidate distances corresponding to at least one licensed device from the cognitive radio device based on spectrum sensing side information including, for each licensed device of the at least one licensed device, determining a shortest distance of the set of candidate distances to the corresponding licensed device; and dynamically controlling transmit power of the cognitive radio based on the one or more shortest distances to the at least one licensed device thereby substantially preventing interference by the cognitive radio device with the at least one licensed device. - View Dependent Claims (17, 18, 19)
-
-
20. A system for performing power control for a cognitive radio device in a cognitive radio system, comprising:
-
means for determining a minimum distance, or a function related to the minimum distance, between a primary transmitter of a primary device and a cognitive radio device based on information from a spectrum sensing process for sensing the presence of the primary device on a shared spectrum based on signals emitted from the primary transmitter; and means for dynamically controlling a maximum transmit power of the cognitive radio device based on the minimum distance, or the function related to the minimum distance, output from the means for determining to guarantee a quality of service requirement of the primary device while the cognitive radio device shares the shared spectrum with the primary device.
-
Specification