System and method of quantifying the degree of balance on forward link and reverse link channels

• US 6,167,259 A
• Filed: 06/19/1998
• Issued: 12/26/2000
• Est. Priority Date: 06/19/1998
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Shah, Ali R.
• Primary Examiner(s): SMITH, SHEILA B
• Application Number:
  US09/100,278
• Time in Patent Office: 921 Days
• Field of Search: 455/504, 455/506, 455/63, 455/65, 455/67.1, 455/69, 455/453, 455/452, 455/517, 455/423, 455/424, 455/443, 455/9, 455/10, 370/329, 370/337, 370/280, 370/468
• US Class Current: 455/424
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

A telecommunications system and method is disclosed for analyzing the speech quality, e.g., the Bit Error Rate (BER), on the forward and reverse links to determine whether the links are balanced. For a target cell, the BER on the forward and reverse links can first be measured. The determination of whether the links in the target cell are balanced depends upon whether the BER percentage is known or only the BER class information is available. If the BER percentage is known, the relative difference of the mean BER on the reverse and forward links can be compared to determine the degree of the balance. However, if only the BER class is available, the relative distribution of occurrences of the BER classes on the reverse and forward links can be analyzed to determine whether the links are balanced. The analysis of the path balance can also be used to benchmark speech quality balance in cellular systems.

Claims

1. A telecommunications system for quantifying the degree of balance of a forward link channel and a reverse link channel within a cell within a cellular network, said telecommunications system comprising:

a base station within said cell, said base station measuring a plurality of bit error rates on said reverse link channel;

measuring means for measuring a plurality of bit error rates on said forward link channel; and

quantifying means for quantifying the degree of balance of said forward and reverse link channels based upon said bit error rates on said reverse link channel and said bit error rates on said forward link channel, the degree of balance indicating the degree to which said bit error rates on said forward and reverse link channels are equal.

2. The telecommunications system of claim 1, further comprising a balancing node in communication with said base station, said balancing node receiving said bit error rates on said reverse link from said base station and said bit error rates on said forward link.

3. The telecommunications system of claim 2, wherein said quantifying means are within said balancing node.

4. The telecommunications system of claim 2, wherein said balancing node is a mobile switching center.

5. The telecommunications system of claim 1, further comprising a mobile terminal in wireless communication with said base station, said measuring means being located within said mobile terminal.

6. The telecommunications system of claim 1, wherein the degree of balance of said forward and reverse links is determined by said quantifying means determining a first average of said bit error rates on said forward link and a second average of said bit error rates on said reverse link, said quantifying means determining a value corresponding to the difference between said first average and said second average.

7. The telecommunications system of claim 1, wherein said bit error rates on said forward and reverse links are bit error rate classes.

8. The telecommunications system of claim 7, wherein said quantifying means converts each of said bit error rate classes on said forward and reverse links into median bit error rate percentages, said quantifying means determining a first average of said mean bit error rate percentages on said forward link and a second average of said mean bit error rate percentages on said reverse link, said quantifying means determining a value corresponding to the difference between said first average and said second average, said quantifying means quantifying the degree of balance of said forward and reverse links using said value.

9. The telecommunications system of claim 7, wherein said quantifying means determines the number of each of said bit error rate classes on said forward link and the number of each of said bit error rate classes on said reverse link, said quantifying means computing a metric from the number of each of said bit error rate classes on said forward link and the number of each of said bit error rate classes on said reverse link.

10. The telecommunications system of claim 9, wherein said quantifying means determines a chisquare cumulative distribution based upon the number of each of said bit error rate classes on said forward link and the number of each of said bit error rate classes on said reverse link, said quantifying means calculating an observed level of significance based upon said chisquare cumulative distribution, said quantifying means determining the degree of balance of said forward and reverse links based upon said metric and said observed level of significance.

11. A method for quantifying the degree of balance of a forward link channel and a reverse link channel within a cell within a cellular network, said method comprising the steps of:

measuring, by a base station within said cell, a plurality of bit error rates on said reverse link channel;

measuring a plurality of bit error rates on said forward link channel; and

quantifying the degree of balance of said forward and reverse link channels based upon said bit error rates on said reverse link channel and said bit error rates on said forward link channel, the degree of balance indicating the degree to which said bit error rates on said forward and reverse link channels are equal.

12. The method of claim 11, further comprising, before said step of quantifying, the step of:

receiving, by a balancing node in communication with said base station, said bit error rates on said reverse link from said base station and said bit error rates on said forward link.

13. The method of claim 12, wherein said step of quantifying is performed by said balancing node.

14. The method of claim 12, wherein said balancing node is a mobile switching center.

15. The method of claim 11, wherein said step of measuring said bit error rates on said reverse channel is performed by a mobile terminal in wireless communication with said base station.

16. The method of claim 11, wherein said step of quantifying is performed by determining a first average of said bit error rates on said forward link and a second average of said bit error rates on said reverse link, and determining a value corresponding to the difference between said first average and said second average.

17. The method of claim 11, wherein said bit error rates on said forward and reverse links are bit error rate classes.

18. The method of claim 17, wherein said step of quantifying is performed by converting each of said bit error rate classes on said forward and reverse links into median bit error rate percentages, determining a first average of said mean bit error rate percentages on said forward link and a second average of said mean bit error rate percentages on said reverse link, and determining a value corresponding to the difference between said first average and said second average.

19. The method of claim 17, wherein said step of quantifying is performed by determining the number of each of said bit error rate classes on said forward link and the number of each of said bit error rate classes on said reverse link, and computing a metric from the number of each of said bit error rate classes on said forward link and the number of each of said bit error rate classes on said reverse link.

20. The method of claim 19, wherein said step of quantifying is further performed by determining a chisquare cumulative distribution based upon the number of each of said bit error rate classes on said forward link and the number of each of said bit error rate classes on said reverse link, calculating an observed level of significance based upon said chisquare cumulative distribution, said step of quantifying the degree of balance of said forward and reverse links being based upon said metric and said observed level of significance.