Methods and systems for spectrum management
In the static and exclusive spectrum allocation paradigm, the spectrum-access parameters for a service are chosen to mitigate potential harmful-interference and ensure minimum performance under worst-case conditions. The new dynamic spectrum-sharing paradigm necessitates dynamically defining and enforcing the spectrum-access rights while accommodating the dynamics of the RF environment and the spectrum-access scenarios. To enforce spectrum-access rights, emphasis is placed on capturing the use of spectrum by an individual transceiver. Spectrum-access rights are articulated in terms of the characterization of the spectrum used by an individual transceiver in the space, time, and frequency dimensions. In order to estimate the use of spectrum in real time, an RF-sensor network is employed, the network uses interference-tolerant algorithms to estimate the transceiver spectrum-access parameters and to characterize the propagation environment.
1. A method for determining whether to grant a request for spectrum access, comprising:
electronically receiving the request for spectrum access, wherein the request comprises a desired frequency band; a desired time period, a requested transmit power, and a requested transmitter location;
determining a geographical region based on the requested transmitter location and requested transmit power;
dividing the geographical region into a set of unit-spectrum-spaces, each unit-spectrum-space comprising a unit-region of space having a sample point, a time quanta, and a frequency band;
receiving, from an RF sensor network, current spectrum consumption information for transmitters and receivers in the geographical region;
quantifying utilized-spectrum for the geographical region by:
calculating the power received from each transmitter in the geographical region at each of a plurality of sample points, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a spectrum-occupancy for each sample point by aggregating the power received from each transmitter at the respective sample point and the average ambient noise power at the respective sample point;
calculating a spectrum-occupancy for each unit-spectrum-space within the geographical region; and
aggregating the spectrum-occupancy of each unit-spectrum-space
quantifying available-spectrum for the geographical region; and
granting or denying the request for spectrum access according to the utilized-spectrum and available-spectrum.
2. The method of claim 1 , wherein calculating the power received from each transmitter comprises:
calculating a transmitter-occupancy at each sample point for each transmitter in the geographical region;
calculating a transmitter-occupancy in each unit-spectrum-space within the geographical region; and
aggregating the transmitter-occupancy of each unit-spectrum-space.
3. The method of claim 1 , wherein quantifying available-spectrum for the geographical region, further comprises:
calculating the power received from each transmitter in the geographical region at each of a plurality of sample points, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a spectrum-occupancy for each sample point by aggregating the power received from each transmitter at the respective sample point and the average ambient noise power at the respective sample point;
calculating a spectrum-occupancy for each unit-spectrum-space within the geographical region;
calculating a receiver interference-margin for each receiver in the geographical region at each of a plurality of sample points, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a receiver-imposed interference-opportunity for each receiver in the geographical region at each of the plurality of sample points;
calculating a spectrum-opportunity at each sample point, wherein the spectrum-opportunity is a minimum value of the calculated receiver-imposed interference-opportunity for each receiver at the respective sample point;
calculating a unit-spectrum-space opportunity for each unit-spectrum-space within the geographical region;
calculating a unit-spectrum-space liability by subtracting the unit-spectrum-space occupancy and unit-spectrum-space opportunity from the maximum spectrum-consumption for each unit-spectrum-space within the geographical region; and
aggregating the unit-spectrum-space liability of each unit-spectrum-space.
4. The method of claim 3 , wherein calculating the power received from each transmitter in the geographical region comprises:
calculating a receiver-liability at each of a plurality of sample points and for each receiver in the geographical region, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a receiver-liability in each unit-spectrum-space within the geographical region; and
aggregating the receiver-liability of each unit-spectrum-space.
5. A system for controlling spectrum access, comprising:
a communication port;
a processor in electronic communication with the communication port, the processor programmed to:
receive a request for spectrum access at the communication port, wherein the request comprises a desired frequency band; a desired time period, a requested transmit power, and a requested transmitter location;
determine a geographical region based on the requested transmitter location and requested transmit power;
receive at the communication port, from an RF sensor network, current spectrum consumption information for transmitters and receivers in the geographical region;
quantify utilized-spectrum for the geographical region by:
calculating the power received from each transmitter in the geographical region at each of a plurality of sample points, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a spectrum-occupancy for each sample point by aggregating the power received from each transmitter at the respective sample point and the average ambient noise power at the respective sample point;
calculating a spectrum-occupancy for each unit-spectrum-space within the geographical region; and
aggregating the spectrum-occupancy of each unit-spectrum-space;
quantify available-spectrum for the geographical region; and
transmit a response granting the request for spectrum access according to the utilized-spectrum and available-spectrum.
6. The system of claim 5 , wherein the processor is programmed to calculate the power received from each transmitter by:
dividing the geographical region into a set of unit-spectrum-spaces, each unit-spectrum-space comprising a unit-region of space having a sample point, a time quanta, and a frequency band;
calculating a transmitter-occupancy at each sample point for each transmitter in the geographical region;
calculating a transmitter-occupancy in each unit-spectrum-space within the geographical region; and
aggregating the transmitter-occupancy of each unit-spectrum-space.
7. The system of claim 5 , wherein the processor is programmed to quantify available-spectrum for the geographical region by:
calculating the power received from each transmitter in the geographical region at each of a plurality of sample points, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a spectrum-occupancy for each sample point by aggregating the power received from each transmitter at the respective sample point and the average ambient noise power at the respective sample point;
calculating a spectrum-occupancy for each unit-spectrum-space within the geographical region;
calculating a receiver interference-margin for each receiver in the geographical region at each of a plurality of sample points, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a receiver-imposed interference-opportunity for each receiver in the geographical region at each of the plurality of sample points;
calculating a spectrum-opportunity at each sample point, wherein the spectrum-opportunity is a minimum value of the calculated receiver-imposed interference-opportunity for each receiver at the respective sample point;
calculating a unit-spectrum-space opportunity for each unit-spectrum-space within the geographical region;
calculating a unit-spectrum-space liability by subtracting the unit-spectrum-space occupancy and unit-spectrum-space opportunity from the maximum spectrum-consumption for each unit-spectrum-space within the geographical region; and
aggregating the unit-spectrum-space liability of each unit-spectrum-space.
8. The system of claim 7 , wherein the processor is programmed to calculate the power received from each transmitter in the geographical region by:
calculating a receiver-liability at each of a plurality of sample points and for each receiver in the geographical region, wherein each sample point of the plurality of sample points corresponds to a unit-region of the geographical region;
calculating a receiver-liability in each unit-spectrum-space within the geographical region; and
aggregating the receiver-liability of each unit-spectrum-space.