Methods and systems for environmental sensing capability planning in a shared spectra
Techniques for planning locations of receiver systems for an environmental sensing capabilities (ESC) system are provided. An ESC system is used to detect activity of primary users in shared spectra. The techniques can be used to reduce dead zone area(s), created by the receiver systems, for radios of secondary systems using the shared frequency spectrum.
1. A method, comprising:
receiving parameter data of a receiver system of an environmental sensing capability (ESC) system and configuration data, wherein the configuration data comprises data, other than receiver system parameter data, including a region of impact (ROI) around the receiver system, wherein the ESC system is configured to detect transmissions of an incumbent user in shared frequency spectrum in a dynamic protection area;
using the ROI, determining prospective locations, in the ROI, of radios configured to transmit in the shared frequency spectrum, and a number of such radios;
using the determined prospective locations, determining a first radio transmit power level, for a radio in each determined prospective location, by allocating a transmit power level to each radio in a neighborhood area around the receiver system so that an aggregate interference at the receiver system from each radio in the neighborhood area does not exceed an interference threshold level;
identifying any radio whose first transmit power level is less than a minimum power threshold level for a category type of a corresponding radio;
determining a second radio transmit power level, for the radio in each determined prospective location except for any identified radio, by allocating another transmit power level to each radio in the neighborhood area around the receiver system so that the aggregate interference at the receiver system from each radio in the neighborhood area does not exceed the interference threshold level;
determining a dead zone ratio of identified radios with respect to a number of possible radios in the shared frequency spectrum and in the ROI; and
based upon at least one of a protection region coverage ratio (PRCR) and the dead zone ratio, recommending changing at least one parameter of the receiver system, wherein the PRCR is a ratio of (a) a portion of a protection region in which the receiver system can detect a signal above a threshold power level with respect to (b) a total area of the protection region, and wherein the protection region is an area where aggregate interference must be below the interference threshold level.
2. The method of claim 1 , wherein, based upon the at least one of the PRCR and the dead zone ratio, recommending changing the at least one parameter of the receiver system comprises:
determining if the dead zone ratio is less than a dead zone threshold level;
determining that the dead zone ratio is less than the dead zone threshold level, then determining the PRCR;
determining if the PRCR is greater than a first protection region coverage ratio level (PRCRL 1 );
determining that the PRCR is not greater than the PRCRL 1 , then determining if the PRCR is greater than a second protection region coverage ratio level (PRCRL 2 ), wherein the PRCRL 2 is less than the PRCRL 1 ;
determining that the PRCR is greater than the PRCRL 2 , then recommending increasing receiver system front end gain;
determining that the PRCR is not greater than the PRCRL 2 , then recommending changing at least one receiver system parameter;
determining that the dead zone ratio is not less than the dead zone threshold level, then determining if any radios are in a line of sight (LOS) of a main beam of an antenna of the receiver system;
determining that at least one radio is in the LOS of the main beam of the antenna of the receiver system, then recommending changing antenna azimuth;
determining that no radio is in the LOS of the main beam of the antenna of the receiver system, then determining if terrain around the antenna of the receiver system is flat;
determining that terrain around the antenna is flat, then recommending reducing receiver system front end gain; and
determining that the terrain around the antenna is not flat, then recommending reducing at least one of receiver system antenna height and receiver system front end gain;
wherein receiver system parameters comprise receiver system azimuth, receiver system location, receiver system antenna height, and receiver system front end gain.
3. The method of claim 1 , wherein the configuration data further comprises at least one of: at least one candidate geographic location, at least one candidate receiver system location, a dead zone threshold level, a first protection region threshold level, a second protection region threshold level, at least one population density, a market penetration factor, a channel factor, an aggregate interference power spectral density threshold at a receiver system from radios, a confidence level, a radiated peak power spectral density level, a dead zone threshold level, a first protection region coverage ratio level, a second protection region coverage ratio level, a threshold flatness level, a population density threshold level, at least one minimum inter-radio distance, at least one number of users per radio, population data for at least one geographic region, at least one receiver system parameter increment, a first threshold transmit power spectral density level, and a second threshold transmit power spectral density level.
4. The method of claim 1 , wherein determining the prospective locations, in the ROI, comprises:
obtaining population data for at least one geographic region;
determining a number of radios per channel in the region of impact; and
determining a number of candidate geographic locations.
5. The method of claim 4 , wherein determining the number of candidate geographic locations comprises determining ceil(Deployment Scaling Factor*R i *N i ), wherein the Deployment Scaling Factor is a scaling factor whose unit is candidate geographic locations per radio and is a positive number constrained by a minimum inter-radio distance, R i is a unitless scaling factor for an i th geographic region and relates to candidate radio locations, and N i , is a number of radios per channel in the i th geographic region.
6. The method of claim 1 , further comprising:
determining whether an automated mode was selected;
determining that the automated mode was selected, then determining whether the receiver system parameters were classified as satisfactory;
determining that the receiver system parameters were not classified as satisfactory, then incrementing a number of iterations;
determining if the number of iterations performed is greater than a maximum number of iterations; and
determining that the number of iterations performed is not greater than a maximum number of iterations, then proceed to the determining prospective locations of the radios configured to transmit in the shared frequency spectrum in the region of impact.