System and methods for rapidly determining CDMA network performance

• US 6,549,781 B1
• Filed: 04/12/2000
• Issued: 04/15/2003
• Est. Priority Date: 12/15/1999
• Status: Expired due to Term

• Current Assignee: Verizon Laboratories Incorporated (Verizon Communications Inc.)
• Original Assignee: Verizon Laboratories Incorporated (Verizon Communications Inc.)
• Inventors: Yurik, Aline, Kalofonos, Dimitris, Yang, Ning, Ganesh, Rajamani, Fagen, Donna, OʼByrne, Vincent A.
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US09/547,970
• Time in Patent Office: 1,098 Days
• Field of Search: 455/62, 455/63, 455/67.1, 455/67.2, 455/67.3, 455/67.6, 455/423, 455/424, 455/68, 455/422, 455/446, 455/447, 455/453, 455/456, 455/500, 455/501, 455/448, 455/449, 455/450, 455/463, 455/517
• US Class Current: 455/446
• CPC Class Codes: H04L 1/24 Testing correct operation
• CPC Class Codes: H04W 16/18 Network planning tools

Abstract

A system (200) provides a network designer with a mechanism by which to quickly estimate the performance of a code division multiple access wireless communication network. The system (200) allows the designer to enter a group of network and sector parameters. Based on these parameters, the user can choose one of three methods depending on a desire for speed, accuracy, and generality of result. The system (200) determines the pilot strength and interference for each location in the network. The system (200) determines pilot strength to interference values for each location. The system (200) estimates the performance of the communication network using these determined values and accounting for user-defined network parameters.

Claims

1. A method for estimating a performance of a digital network having one or more sectors, the method comprising:

identifying probable servers for every location in the network;

determining network conditions;

determining hand-down traffic to analog;

generating a traffic map based on the determined hand-down traffic;

re-computing the network conditions based on the generated traffic map; and

estimating the performance of the network using the re-computed network conditions.

2. The method of claim 1 wherein the determining network conditions includes:

determining a traffic load of each sector,

determining a cell site transmit power, and

determining a total interference power.

3. The method of claim 1 wherein the identifying probable servers includes:

determining a strength of a received pilot signal at each location from every sector,

determining a minimum interference power at each location,

determining pilot strength-to-interference values for every location within a sector, and

determining an initial best server area for each location.

4. The method of claim 3 wherein the identifying probable servers includes further includes:

sorting the determined pilot strength-to-interference values for each location, and

storing the determined pilot strength-to-interference values.

5. The method of claim 3 wherein the determining an initial best server area includes:

comparing determined pilot strength-to-interference values for a location with a threshold value, and

selecting those determined pilot strength-to-interference values that exceed the threshold value.

6. The method of claim 5 wherein the sorting includes:

sorting the selected values in descending order.

7. The method of claim 1 wherein the determining a cell site transmit power includes:

determining the cell site transmit power for each sector using the determined traffic load for a respective sector and user-defined parameters.

8. The method of claim 7 wherein the determining a cell site transmit power includes:

determining the cell site transmit power for each sector using the determined traffic load for a respective sector and one or more of a voice activity factor, a traffic channel power value, a sync channel power value, and a paging channel power value.

9. The method of claim 3 wherein the determining hand-down traffic includes:

comparing, at one or more locations, a determined pilot strength-to-interference value of a beacon pilot signal to a beacon threshold value,

comparing, at one or more locations, a determined pilot strength-to-interference value of a border pilot signal to a border threshold criterion, and

identifying traffic as hand-down traffic when the determined pilot strength-to-interference value of the beacon pilot signal exceeds the beacon threshold or the determined pilot strength-to-interference value of the border pilot signal satisfies the border threshold criterion.

10. A system for estimating a performance of a digital network having one or more sectors, the system comprising:

means for identifying probable servers for every location in the network;

means for determining network conditions;

means for determining hand-down traffic to analog;

means for generating a traffic map based on the determined hand-down traffic;

means for re-computing the network conditions based on the generated traffic map; and

means for estimating the performance of the network using the re-computed network conditions.

11. A system for estimating a performance of a digital network having one or more sectors, the system comprising:

a memory for storing instructions; and

a processor configured to execute the instructions to identify probable servers for every location in the network, determine network conditions, determine hand-down traffic to analog, generate a traffic map based on the determined hand-down traffic, re-compute the network conditions based on the generated traffic map, and estimate the performance of the network using the re-computed network conditions.

12. The system of claim 11 wherein, when determining network conditions, the processor is further configured to:

determine a traffic load of each sector,

determine a cell site transmit power, and

determine a total interference power.

13. The system of claim 11 wherein, when identifying probable servers, the processor is further configured to:

determine a strength of a received pilot at each location from every sector,

determine a minimum interference power at each location,

determine pilot strength-to-interference values for every location within a sector, and

determine an initial best server area for each location.

14. The system of claim 13 wherein, when identifying probable servers, the processor is further configured to:

sort the determined pilot strength-to-interference values for each location, and

store the determined pilot strength-to-interference values in the memory.

15. The system of claim 13 wherein, when determining an initial best server area, the processor is further configured to:

compare determined pilot strength-to-interference values for a location with a threshold value, and

select those determined pilot strength-to-interference values that exceed the threshold value.

16. The system of claim 15 wherein, when sorting, the processor is further configured to:

sort the selected values in descending order.

17. The system of claim 11 wherein, when determining a cell site transmit power, the processor is further configured to:

determine the cell site transmit power for each sector using the determined traffic load for a respective sector and user-defined parameters.

18. The system of claim 17 wherein, when determining a cell site transmit power, the processor is further configured to:

determine the cell site transmit power for each sector using the determined traffic load for a respective sector and one or more of a voice activity factor, a traffic channel power value, a sync channel power value, and a paging channel power value.

19. The system of claim 13 wherein, when determining hand-down traffic, the processor is further configured to:

compare, at one or more locations, a determined pilot strength-to-interference value of any beacon pilot signal to a beacon threshold value, and

compare, at one or more locations, a determined pilot strength-to-interference value of any border pilot signal to a border threshold criterion; and

mark traffic as hand-down traffic when the determined pilot strength-to-interference value of the beacon pilot signal exceeds the beacon threshold or the determined pilot strength-to-interference value of the border pilot signal satisfies the border threshold criterion.

20. A method for estimating a performance of a network having one or more sectors, the method comprising:

determining a pilot strength value at each portable location in the network;

determining an interference value at each portable location in the network;

determining pilot strength-to-interference values at each portable location in the network based on the determined pilot strength values and the interference values;

determining network conditions;

determining hand-down traffic to analog;

generating a traffic map based on the determined hand-down traffic;

re-computing the network conditions based on the generated traffic map; and

estimating the performance of the network based on the determined pilot strength-to-interference values, the estimating including using one or more of traffic channel power, sync channel power, paging channel power, forward cable loss, head loss, frequency, portable antenna gain, portable noise figure, sector size, sector type, number of channels, and power per channel to estimate the performance.

21. The method of claim 20 wherein the determining an interference value includes:

determining an interference value based on path loss data and at least one user-provided parameter.

22. The method of claim 21 wherein the determining pilot strength-to-interference values includes:

determining an interference value based on path loss data and at least one channel power value.

23. The method of claim 20 wherein the one or more of traffic channel power, sync channel power, paging channel power, forward cable loss, head loss, frequency, portable antenna gain, portable noise figure, sector size, sector type, number of channels, and power per channel are provided by a user.

24. The method of claim 20 further comprising:

graphically providing a representation of the estimating to a user, the graphical representation distinguishing different levels of pilot strength-to-interference values.

25. The method of claim 20 wherein the determining an interference value includes:

determining an interference value at a point in the network based on a predetermined point-to-point path loss and at least one user-provided parameter.

26. The method of claim 25 wherein the determining an interference value includes:

determining the interference value based on the predetermined point-to-point path loss and at least one channel power value.

27. The method of claim 25 further comprising:

determining pilot strength-to-interference values at the point in the network that are above a threshold;

determining a distance between the point in the network and a base station; and

determining whether the distance is within a sector size of the base station.

28. The method of claim 27 further comprising:

determining if a sector in which the point is located is a traffic, border, or beacon sector.

29. The method of claim 27 wherein the estimating includes:

graphically providing a representation of the estimating to a user, the graphical representation depicting a list of the pilot strength to interference values above the threshold for the point in the network.

30. A system for estimating a performance of a network having one or more sectors, the method comprising:

a memory for storing instructions; and

a processor configured to execute the instructions to determine a pilot strength value at each portable location in the network;

determine an interference value at each portable location in the network;

determine pilot strength-to-interference values at each portable location in the network using the determined pilot strength and interference values;

determine network conditions;

determine hand-down traffic to analog;

generate a traffic map based on the determined hand-down traffic;

recompute the network conditions based on the generated traffic map; and

estimate the performance of the network based on the determined pilot strength-to-interference values and using one or more of traffic channel power, sync channel power, paging channel power, forward cable loss, head loss, frequency, portable antenna gain, portable noise figure, sector size, sector type, number of channels, and power per channel.

31. The system of claim 30 wherein, when determining an interference value, the processor is further configured to:

determine an interference value based on path loss data and at least one user-provided parameter.

32. The system of claim 31 wherein, when determining an interference value, the processor is further configured to:

determine the interference value based on path loss data and at least one channel power value.

33. The system of claim 30 wherein the one or more of traffic channel power, sync channel power, paging channel power, forward cable loss, head loss, frequency, portable antenna gain, portable noise figure, sector size, sector type, number of channels, and power per channel are provided by a user.

34. The system of claim 30 wherein the processor is further configured to:

provide a result of the estimating to a user, the result being a graphical representation distinguishing different levels of pilot strength-to-interference values.

35. The system of claim 30 wherein, when determining an interference value, the processor is further configured to:

determine an interference value at a point in the network based on a predetermined point-to-point path loss and at least one user-provided parameter.

36. The system of claim 35 wherein, when determining an interference value, the processor is further configured to:

determine the interference value based on the predetermined point-to-point path loss and at least one channel power value.

37. The system of claim 35 wherein the processor is further configured to:

determine pilot strength-to-interference values at the point in the network that are above a threshold;

determine a distance between the point in the network and a base station; and

determine whether the distance is within a sector size of the base station.

38. The system of claim 37 wherein the processor is further configured to:

determine if a sector in which the point is located is a traffic, border, or beacon sector.

39. The system of claim 37 wherein, when estimating, the processor is further configured to:

provide a result of the estimating to a user, the result having a list of the pilot strength to interference values above the threshold for the point in the network.

40. A computer-readable medium containing instructions for controlling at least one processor to perform a method that estimates performance of a network, the method comprising:

determining a pilot strength value at each portable location in the network;

determining an interference value at each portable location in the network;

determining pilot strength-to-interference values at each portable location in the network;

determining network conditions;

determining hand-down traffic to analog;

generating a traffic map based on the determined hand-down traffic;

re-computing the network conditions based on the generated traffic map;

estimating the performance of the network based on the determined pilot strength-to-interference values; and

graphically providing a representation of the estimating to a user, the graphical representation depicting a list of pilot strength-to-interference values above a threshold for a user-specified point in the network.

41. The computer-readable medium of claim 40 wherein the estimating includes:

graphically providing a representation of the estimating to a user, the graphical representation distinguishing different levels of pilot strength-to-interference values.

42. A computer-readable medium containing instructions for controlling at least one processor to perform a method that estimates performance of a digital network, the method comprising:

identifying probable servers for every location in the network;

determining network conditions;

determining hand-down traffic to analog;

generating a traffic map based on the determined hand-down traffic;

re-computing the network conditions based on the generated traffic map; and

estimating the performance of the network using the re-computed network conditions.