Automatic color code (SAT) assignment method used in frequency planning for wireless networks

• US 6,507,742 B1
• Filed: 11/11/1999
• Issued: 01/14/2003
• Est. Priority Date: 11/11/1999
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Shi, Jianxu James, Lin, Zongde
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): Quach, Henry M.
• Application Number:
  US09/438,748
• Time in Patent Office: 1,160 Days
• Field of Search: 455/446, 455/447, 455/422, 455/456, 455/450, 455/423, 455/54.1, 455/503, 455/67.6
• US Class Current: 455/446
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

A method of automatically adaptively assigning color codes to radio channels in the wireless network. The method comprises the steps of assigning an initial color code to a channel using a propagation prediction technique and automatically optimizing the initial color code assignment of the channel using radio disturbance measurement data when an alternate color code with the least amount of disturbance is identified.

Claims

1. In a telecommunications network having a plurality of cell sites, a method of automatically assigning color codes to channels in the network, comprising the steps of:

assigning an initial color code to a channel by performing a propagation prediction technique wherein said technique includes calculating the expected signal strength of cell sites within the network;

automatically optimizing the initial color code assignment of said channel when an alternate color code with the least amount of disturbance is identified;

utilizing Radio Disturbance Recordings (RDR) having an interference level value and an associated interference duration value;

calculating an accumulated average interference for each color code from the RDR; and

selecting an optimal accumulated average interference for each color code by multiplying each said interference level value for the color code by its associated interference duration value and summing each of the resulting values.

2. The method of claim 1 wherein said step of performing a propagation prediction technique further comprises the step of determining the type of cell site equipment and terrain.

3. The method of claim 1 wherein said assigning step further comprises the step of predicting the interference between cell sites having the same color code.

4. The method of claim 1 wherein said assigning step further comprises the step of choosing the color code with the minimum predicted interference.

5. The method of claim 1 wherein said step of automatically optimizing the initial color code assignment comprises utilizing Radio Disturbance Recordings (RDR) to determine channel propagation characteristics.

6. The method of claim 1 wherein said step of automatically optimizing the initial color code assignment further comprises the step of calculating the accumulated average interference for each color code.

7. The method of claim 6 wherein said step of automatically optimizing the initial color code assignment further comprises setting the color code of a cell site to the color code having the optimal accumulated average interference.

8. In a telecommunications network having a plurality of cell sites, a method of automatically assigning color codes to channels in the network, comprising the steps of:

assigning an initial color code to a channel in the network by predicting propagation patterns between neighboring cells in said network;

automatically optimizing the initial color code assignment of said channel when an alternate color code with the least amount of disturbance is identified;

utilizing Radio Disturbance Recordings (RDR) having an interference level value and an associated interference duration value;

calculating an accumulated average interference for each color code from the RDR; and

selecting an optimal accumulated average interference for each color code by multiplying each of said interference level value for the color code by its associated interference duration value and summing each of the resulting values.

9. The method of claim 8 wherein said step of performing a propagation prediction technique further comprises the step of determining the type of cell site equipment.

10. The method of claim 8 wherein said step of performing a propagation prediction technique further comprises the step of determining the type of cell site terrain.

11. The method of claim 9 wherein said step of determining the type of cell site equipment further comprises the steps of determining antenna height, direction, pattern and downtilt, and BSS transmit power.

12. The method of claim 10 wherein said step of determining the type of cell site terrain further comprises the steps of determining land usage, terrain height variation, and distance from the cell site.

13. The method of claim 8 wherein said assigning step further comprises the step of predicting the interference between each cell site and all co-channel cells having the same color code.

14. The method of claim 8 wherein said assigning step further comprises the step of choosing the color code with the minimum predicted interference.

15. The method of claim 8 wherein said Radio Disturbance Recordings interference level values are measured during a pre-determined period of time for each cell site.

16. The method of claim 8 wherein said Radio Disturbance Recordings further comprises the step of recording interference level values which are larger than a pre-determined threshold interference level value.

17. The method of claim 8 wherein said step of automatically optimizing the initial color code assignment further comprises the step of setting the color code of a cell site to a post color code having said optimal accumulated average interference if the post color code is different from the initial color code.

18. The method of claim 8 wherein said step of automatically optimizing the initial color code assignment further comprises the step of setting the color code of a cell site to any of two post color codes having the same said optimal accumulated average interference if the post color codes are different from the initial color codes.

19. The method of claim 8 wherein said step of automatically optimizing the initial color code assignment further comprises the step of leaving the assignment of a color code of a cell site at the initial color code if the accumulated average interference is the same for all color codes.

20. A system for automatic color coding in a telecommunications network having cell sites comprising:

a means for assigning an initial color code to a channel in the network by predicting propagation patterns between said cell sites in said network;

a means for automatically optimizing the initial color code assignment of said channel when an alternate color code with the least amount of disturbance is identified, said means utilizing Radio Disturbance Recordings (RDR) having a interference level value and an associated interference duration value;

a means for calculating an accumulated average interference for each color code from the RDR; and

a means for selecting an optimal accumulated average interference for each color code by multiplying each of said interference level value for the color code by its