Methods for generating radio frequency maps of networks

1. A method of generating a radio frequency (RF) map of a network, the method comprising:

obtaining, by a controller, received signal strengths of at least one user equipment (UE) in a first technology network;

determining, by the controller, a back projection of a second technology network based on the received signal strengths, the back projection representing an attenuation function of a coverage area of the second technology network; and

generating, by the controller, an RF map of the second technology network based on the determining, the RF map illustrating the attenuation function of the coverage area of the second technology network.

2. The method of claim 1 , wherein determining the back projection is based on an inverse Radon transform function.

3. The method of claim 2 , wherein the received signal strengths represent a Radon transform of the attenuation function of the second technology network.

4. The method of claim 1 , wherein the obtaining includes obtaining the received signal strengths during a first drive test.

5. The method of claim 4 , wherein the generating generates the RF map without a second drive test.

6. The method of claim 1 , further comprising:

transmitting a pilot before the obtaining, the received signal strength being based on a transmit power of the pilot.

7. The method of claim 1 , wherein the generating generates the RF map, the RF map representing attenuation coefficients associated with locations in second technology network.

8. The method of claim 1 , wherein the determining determines the back projection, the back projection representing the attenuation function for the second technology network.

9. The method of claim 1 , wherein the first technology network and the second technology network have overlapping coverage areas.

10. A method of generating a radio frequency (RF) map of a first network, the method comprising:

obtaining, by a controller, test data for a second network;

determining, by the controller, a back projection of the network based on the test data, the back projection representing an attenuation function of a coverage area of the first network; and

generating, by the controller, an RF map of the first network based on the determining, the RF map illustrating an attenuation function of a coverage area of the first network.

11. The method of claim 10 , wherein determining the back projection is based on an inverse Radon transform function.

12. The method of claim 10 , wherein the test data are received signal strengths of at least one user equipment (UE).

13. The method of claim 10 , wherein the obtaining includes obtaining the received signal strengths during a first drive test.

14. The method of claim 13 , wherein the generating generates the RF map without a second drive test.

15. The method of claim 10 , further comprising:

transmitting a pilot before the obtaining, the test data being based on a transmit power of the pilot.

16. The method of claim 10 , wherein the generating generates the RF map, the RF map representing attenuation coefficients associated with locations in the first network.

17. The method of claim 10 , wherein the determining determines the back projection, the back projection representing the attenuation function for the first network.

18. The method of claim 10 , wherein the first network is a LTE network and the second network is a UMTS network.

19. The method of claim 10 , wherein the first network and the second network have overlapping coverage areas.