Method of determining RF coverage area in a point-to-multipoint transmission system
View Patent ↗A method of determining RF coverage area in a point-to-multi-point RF transmission system and creating model maps showing serviceable business addresses within a given region. The method includes selecting a standard design signal strength level required to provide suitable service; obtaining field measurements of received signal strength from base stations at various points in the region under investigation; creating a model map of received signal strength having a signal strength level greater than the system standard signal strength level and excluding areas whose field strength measurements do not indicate suitable service; and creating a model map having a signal strength level smaller than the system standard signal strength level. The method is capable of providing more than 90% accuracy, and prevents needless dispatching of installation crews to a customer premise that is outside the effective RF coverage of the system.
1. A method of determining radio coverage in an RF broadcast system that includes a plurality of fixed wireless base stations by creating a map depicting a serviceable business address in a coverage area, the method comprising:
a. using a mathematical model for calculating propagation loss in an urban environment, wherein a link budget reduction margin value is additionally included in the model to create a “model map minus” of the coverage area, and wherein a link budget positive margin value is additionally included in the model to create a “model map plus” of the coverage area;
b. collecting field measurements relative to fixed wireless base stations in the coverage area, including geographic coordinate records and associated signal strength indicators, to create a plurality of measurement data points;
c. processing the field measurements to create a “field service map” of a first subset of the plurality of the measurement data points that indicate a serviceable geographic area, and a “field non-service map” of a second subset of the plurality of the measurement data points that indicate a non-serviceable geographic area;
d. creating a “model map minus enhanced” of the coverage area by removing data from the “model map minus” by subtracting the second subset of the plurality of the measurement data that indicate a “field non-service map”;
e. creating a “model map plus enhanced” of the coverage area by overlaying the “model map plus” with geographic shapes and data based on the first subset of the plurality of the measurement data points that indicate a “field service map”; and
f. combining the geographic shapes and data from the “model map minus enhanced” with the geographic shapes and data from the “model map plus enhanced” to create the desired map depicting a serviceable business address in a coverage area.
2. The method of claim 1 , wherein the RF broadcast system is a point-to-point RF transmission system.
3. The method of claim 1 , wherein the RF broadcast system is a point-to-multipoint RF transmission system.
4. The method of claim 1 , further compromising using the “field service map” to create a single geographical shape encompassing all of the plurality of measurement data points indicating a serviceable area by drawing either a first shape around each data point or a second shape around a series of consecutive data points, the resulting geographic shape indicating a serviceable geographical area based on the field measurements.
5. The method of claim 1 , further compromising using the “field non-service map” to create a single geographical shape encompassing all of the plurality of measurement data points indicating a non-serviceable area by drawing either a first shape around each data point or a second shape around a series of consecutive data points, the resulting geographic shape indicating a non-serviceable geographical area based on the field measurements.
6. A method of determining radio coverage in a point-to-multi-point radio transmission system that includes a plurality of fixed wireless base stations by creating a map depicting a serviceable business area in a coverage area, the method comprising:
a. using a mathematical model for calculating propagation loss in an urban environment, wherein a link budget reduction margin value is additionally included in the model to create a “model map minus” of the coverage area, and wherein a link budget positive margin value is additionally included in the model to create a “model map plus” of the coverage area;
b. collecting field measurements relative to fixed wireless base stations in the coverage area, including geographic coordinate records and associated signal strength indicators, to create a plurality of measurement data points;
c. processing the field measurements using a subset of the plurality of the measurement data points that indicate suitable service to create a “field service map”;
d. processing the field measurements using a subset of the plurality of measurement data points that do not indicate suitable service to create a “field non-service map”;
e. using the “field service map” to create a single geographical shape encompassing all of the plurality of measurement data points indicating a serviceable area by drawing either a first shape around each data point or a second shape around a series of consecutive data points, the resulting geographic shape indicating a serviceable geographical area based on the field measurements;
f. using the “field non-service map” to create a single geographical shape encompassing all of the plurality of measurement data points indicating a non-serviceable area by drawing either a first shape around each data point or a second shape around a series of consecutive data points, the resulting geographic shape indicating a non-serviceable geographical area based on the field measurements;
g. removing data from the “model map minus” by subtracting the geographical area of the “field non-service map” to create a “model map minus enhanced”;
h. overlaying the “field service map” on top of the “model map plus” such that the field service map inherits geographical information from the “model map plus enhanced”; and
i. combining the geographic shapes and data fields from the “model map plus enhanced” with the “model map minus enhanced” by associating the fixed wireless base stations between both sources to complete the map depicting a serviceable business address in a coverage area.
7. The method of claim 6 , wherein the field measurements collected in step (b) include measurements of signal strength received from each wireless base station.
8. The method of claim 6 , wherein the field measurements collected in step (b) include measurements of received signal strength of test signals transmitted from equipment associated with a test vehicle at various frequencies and received at each wireless base station.
9. The method of claim 6 , wherein the field measurements collected in step (b) include measurements collected in the street where a particular business address is located and measurements collected at a building located at the business address.
10. The method of claim 6 , wherein in step (e) the “field service map” takes into account the difference between field measurements collected in the street where a particular business address is located versus field measurements collected at the building located at the business address.
11. The method of claim 6 , wherein in step (b) a mobile test unit including a test receiver is used for collecting the field measurements.
12. The method of claim 6 , wherein a portable device is used for collecting field measurements at the building located at the business address.
13. The method of claim 6 , wherein the information of step (h) includes the best serving fixed wireless base station names and locations in addition to clusters of radios that supply service to that particular geographic area.
14. The method of claim 9 , wherein in step (b) the field measurements collected in the street where a particular business address is located are collected approximately every twenty meters.