System and method for obtaining optimum RF performance when co-siting cellular base stations

• US 6,895,247 B2
• Filed: 11/01/2001
• Issued: 05/17/2005
• Est. Priority Date: 11/01/2001
• Status: Expired due to Fees

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Mostafa, Ayman
• Primary Examiner(s): Gelin, Jean
• Application Number:
  US09/999,578
• Publication Number:
  US 20030083072A1
• Time in Patent Office: 1,293 Days
• Field of Search: 455/448, 455/449, 455/232.1, 455/239.1, 455/240.1, 455/245.1, 455/245.2, 455/562.1, 455/13.3, 455/19, 455/422.1, 455/426.1, 455/426.2, 455/446, 455/520, 455/62, 455/63.1, 455/63.2, 455/82, 455/83, 455/550.1, 455/555, 455/560, 455/561, 455/13.1, 455/92, 455/67.11, 455/123, 455/125, 455/127.1, 455/138
• US Class Current: 455/448
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures

Abstract

A method of obtaining optimum RF performance for a slave base station when co-siting a master base station with said slave base station involves calculating operating characteristics of the slave base station that is sharing an antenna assembly with the master base station. The third order intercept (IP3) and the noise figure (NF) characteristics of the slave base station are calculated and plotted versus a range of upfront gain values. The plots are studied and compared against vendor specifications and standalone performance characteristics. A desired upfront gain value is then selected to achieve a particular IP3 and NF characteristic for the slave base station. Upon selection, the upfront gain supplied to the slave base station is adjusted via an attenuator placed in-line before the slave base station to match the desired upfront gain.

Claims

1. A method of obtaining optimum RF performance for a slave base station when co-siting a master base station with said slave base station, said method comprising:

calculating the third order intercept (IP3) characteristics of the slave base station that is sharing an antenna assembly with said master base station;

calculating the noise figure (NF) characteristics of the slave base station;

plotting the IP3 and NF characteristics of the slave base station versus a range of up-front gain values;

selecting a desired upfront gain value to achieve a particular IP3 and NF characteristic; and

adjusting the upfront gain supplied to the slave base station to match the desired up-front gain.

2. The method of claim 1 further comprising plotting vendor specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired up-front gain value such that the desired selection is optimized with respect to the vendor specifications for IP3 and NF characteristics.

3. The method of claim 2 further comprising plotting standalone specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the standalone IP3 and NF characteristics.

4. The method of claim 1 further comprising plotting industry specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the industry IP3 and NF characteristics.

5. A system for obtaining optimum RF performance for a slave base station when co-siting a master base station with said slave base station, said system comprising:

means for calculating the third order intercept (IP3) characteristics of the slave base station that is sharing an antenna assembly with said master base station;

means for calculating the noise figure (NF) characteristics of the slave base station;

means for plotting the IP3 and NF characteristics of the slave base station versus a range of upfront gain values;

means for selecting a desired upfront gain value to achieve a particular IP3 and NF characteristic; and

means for adjusting the upfront gain supplied to the slave base station to match the desired upfront gain.

6. The system of claim 5 further comprising means for plotting vendor specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the vendor specifications for IP3 and NF characteristics.

7. The system of claim 6 further comprising means for plotting standalone specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the standalone IP3 and NF characteristics.

8. The system of claim 5 further comprising plotting industry specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the industry IP3 and NF characteristics.

9. A system for obtaining optimum RF performance for a slave base station when co-siting a master base station with said slave base station, said system comprising:

a slave base station coupled by an electrical cable to an antenna assembly via an antenna sharing unit within a master base station;

an attenuator coupled to said electrical cable for adjusting the upfront gain supplied to said slave base station,

wherein said attenuator is adjusted according to calculations of the third order intercept (IP3) and noise figure (NF) characteristics of the slave base station, and wherein said upfront gain is adjusted via said attenuator according to calculations of the third order intercept (IP3) and noise figure (NF) characteristics of the slave base station plotted against calculations of IP3 and NF characteristics with respect to vendor specifications.

10. The system of claim 9 wherein said upfront gain is adjusted via said attenuator according to calculations of the third order intercept (IP3) and noise figure (NF) characteristics of the slave base station plotted against calculations of IP3 and NF with respect to standalone specifications.

11. A computer program product for obtaining optimum RF performance for a slave base station when co-siting a master base station with said slave base station, the computer program product having a medium with a computer program embodied thereon, the computer program product comprising:

computer program code for calculating the third order intercept (IP3) characteristics of the slave base station that is sharing an antenna assembly with said master base station;

computer program code for calculating the noise figure (NF) characteristics of the slave base station;

computer program code for plotting the IP3 and NF characteristics of the slave base station versus a range of upfront gain values;

computer program code for selecting a desired upfront gain value to achieve a particular IP3 and NF characteristic; and

computer program code for adjusting the upfront gain supplied to the slave base station to match the desired upfront gain.

12. The computer program product of claim 11 further comprising computer program code for plotting vendor specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the vendor specifications for IP3 and NF characteristics.

13. The computer program product of claim 11 further comprising computer program code for plotting standalone specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the standalone IP3 and NF characteristics.

14. The computer program product of claim 11 further comprising plotting industry specifications with respect to IP3 and NF characteristics in order to assist in the selection of the desired upfront gain value such that the desired selection is optimized with respect to the industry IP3 and NF characteristics.