System, method, and program for correcting radiowave environment data

1. A radiowave environment data correcting system, comprising correction data determining means that determines correction data for correcting radiowave environment data for sub-areas, the sub-areas being regions into which a peripheral area of a base station provided for a wireless communications system is divided, on the basis of data measurement results obtained at measuring points belonging to the sub-areas,

wherein the radiowave environment data is information that indicates radiowave environment characteristics in the peripheral area of the base station,

wherein division into the regions of the sub-areas is based on an area usage division that is a division predefined according to a particular layout of objects or spaces in the peripheral area of the base station, and

wherein the correction data determining means includes correction data calculating means that calculates the correction data in the sub-areas using the data measurement results obtained at the measuring points existing in the sub-areas; and

the system further comprising sub-area dividing means that divides the base station peripheral area into the sub-areas in accordance with the area usage division, and

radiowave environment data correcting means that corrects the radiowave environment data in the sub-areas using the correction data calculated by the correction data calculating means.

2. The radiowave environment data correcting system according to claim 1 , further comprising correction data retaining means that retains the correction data,

wherein the radiowave environment data correcting means corrects the radiowave environment data by using the retained correction data, in case parameters of the base station corresponding to the radiowave environment data to be corrected are the same as parameters of the base station that are used during the determination of the correction data retained in the correction data retaining means, or in case any differences between the two sets of parameters stay within a predetermined range.

3. The radiowave environment data correcting system according to claim 1 , using an area usage division in which a road having its own angle variation rate decreasing below a preset level is defined as the same sub-area as that of the peripheral area, in case the base station peripheral area is provided outdoors.

4. The radiowave environment data correcting system according to claim 1 , using an area usage division in which the same room or same floor as that of the peripheral area is defined as the same sub-area, in case the base station peripheral area is provided indoors.

5. The radiowave environment data correcting system according to claim 1 , using regions into which a sub-area obtained by division based on the area usage division has been further divided according to a particular azimuth relative to, or distance from, the base station, as sub-areas to be each subjected to independent data correction.

6. The radiowave environment data correcting system according to claim 1 , using regions into which a sub-area obtained by division based on the area usage division has been further divided according to a particular distribution of the measured data, as sub-areas to be each subjected to independent data correction.

7. The radiowave environment data correcting system according to claim 1 ,

wherein the radiowave environment data is data estimated from calculations based upon radiowave propagation simulation.

8. The radiowave environment data correcting system according to claim 7 ,

wherein the radiowave propagation simulation uses a ray-tracing method.

9. A radiowave environment data correcting method comprising:

determining correction data for correcting radiowave environment data for sub-areas, the sub-areas being regions into which a peripheral area of a base station provided for a wireless communications system is divided, on the basis of data measurement results obtained at measuring points belonging to the sub-areas,

wherein the radiowave environment data is information that indicates radiowave environment characteristics in the peripheral area of the base station, and

wherein division into the regions of the sub-areas is based on an area usage division that is a division predefined according to a particular layout of objects or spaces in the peripheral area of the base station;

dividing the base station peripheral area into sub-areas in accordance with the area usage division;

calculating the correction data in the sub-areas using the data measurement results obtained at the measuring points existing in sub-areas; and

correcting the radiowave environment data in the sub-area using the calculated correction data.

10. The radiowave environment data correcting method according to claim 9 , further comprising:

allowing a storage device to retain the correction data; and

correcting the radiowave environment data using the retained correction data, in case parameters of the base station corresponding to the radiowave environment data to be corrected are the same as parameters of the base station that are used during the determination of the retained correction data, or in case any differences between the two sets of parameters stay within a predetermined range.

11. The radiowave environment data correcting method according to claim 9 , further comprising: using an area usage division in which a road having its own angle variation rate decreasing below a preset level is defined as the same sub-area as that of the peripheral area, in case the base station peripheral area is provided outdoors.

12. The radiowave environment data correcting method according to claim 9 , further comprising: using an area usage division in which the same room or same floor as that of the peripheral area is defined as the same sub-area, in case the base station peripheral area is provided indoors.

13. The radiowave environment data correcting method according to claim 9 , further comprising: using regions into which a sub-area obtained by division based on the area usage division has been further divided according to a particular azimuth relative to, or distance from, the base station, as sub-areas to be each subjected to independent data correction.

14. The radiowave environment data correcting method according to claim 9 , further comprising: using regions into which a sub-area obtained by division based on the area usage division has been further divided according to a particular distribution of the measured data, as sub-areas to be each subjected to independent data correction.

15. The radiowave environment data correcting method according to claim 9 ,

wherein the radiowave environment data is data estimated from calculations based upon radiowave propagation simulation.

16. The radiowave environment data correcting method according to claim 15 ,

wherein the radiowave propagation simulation uses a ray-tracing method.

17. A radiowave environment data correcting program for making a computer perform:

determining correction data for correcting radiowave environment data for sub-areas, the sub-areas being regions into which a peripheral area of a base station provided for a wireless communications system is divided, on the basis of data measurement results obtained at measuring points belonging to the sub-areas, wherein the radiowave environment data is information that indicates radiowave environment characteristics in the peripheral area of the base station, and wherein division into the regions of the sub-areas is based on an area usage division that is a division predefined according to a particular layout of objects or spaces in the peripheral area of the base station;

dividing the base station peripheral area into sub-areas in accordance with the area usage division;

calculating the correction data in the sub-areas using the data measurement results obtained at the measuring points existing in the sub-areas; and

correcting the radiowave environment data in the sub-areas using the calculated correction data.

18. The radiowave environment data correcting program according to claim 17 , the program making the computer with correction data retaining means perform:

correcting the radiowave environment data using the retained correction data, in case parameters of the base station corresponding to the radiowave environment data to be corrected are the same as parameters of the base station that are used during the determination of the retained correction data, or in case any differences between the two sets of parameters stay within a predetermined range.

19. The radiowave environment data correcting program according to claim 17 , the program making the computer perform:

using an area usage division in which a road having its own angle variation rate decreasing below a preset level is defined as the same sub-area as that of the peripheral area, in case the base station peripheral area is provided outdoors.

20. The radiowave environment data correcting program according to claim 17 , the program making the computer perform:

using an area usage division in which the same room or same floor as that of the peripheral area is defined as the same sub-area, in case the base station peripheral area is provided indoors.

21. The radiowave environment data correcting program according to claim 17 , the program making the computer perform:

using regions into which a sub-area obtained by division based on the area usage division has been further divided according to a particular azimuth relative to, or distance from, the base station, as sub-areas to be each subjected to independent data correction.

22. The radiowave environment data correcting program according to claim 17 , the program making the computer perform:

using regions into which a sub-area obtained by division based on the area usage division has been further divided according to a particular distribution of the measured data, as sub-areas to be each subjected to independent data correction.