METHOD AND APPARATUS FOR MEASURING MULTI-CELL DATA EFFICIENCY IN LINK ADAPTIVE WIRELESS NETWORKS

• US 20130203401A1
• Filed: 02/04/2013
• Published: 08/08/2013
• Est. Priority Date: 02/03/2012
• Status: Active Grant

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Eden Rock Communications LLC (Nokia Corporation)
• Inventors: Ryan, David James, Harrang, Jeffrey Paul, Immendorf, Chaz, Gormley, Eamonn
• Granted Patent: US 8,874,099 B2
• Time in Patent Office: Days
• US Class Current: 455/422.1
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic

Abstract

Network performance related to the evaluation of an interference reduction scheme may include measuring a signal strength value for a signal sent by at least one base station and received by a plurality of user equipment, calculating first signal strength ratios using the first signal strength value, converting the first signal strength ratio into first user equipment spectral efficiency values for each user equipment of the plurality of user equipment, and comparing the first spectral efficiency value to a second spectral efficiency value to evaluate a data efficiency metric associated with an interference reduction scheme that is running on the base station when the signal strength value is measured.

Claims

1. A networked computer system in a cellular communications network comprising:

a processor;

a memory; and

a non-transitory computer readable medium with computer executable instructions stored thereon which, when executed by the processor, perform the following method;

measuring a signal strength value for a signal sent by at least one base station and received by a plurality of user equipment;

calculating first signal strength ratios using the first signal strength value;

converting the first signal strength ratio into first user equipment spectral efficiency values for each user equipment of the plurality of user equipment; and

comparing a first spectral efficiency value corresponding to the first user equipment spectral efficiency values to a second spectral efficiency value to evaluate a data efficiency metric associated with an interference reduction scheme that is running on the base station when the signal strength value is measured.

2. The networked computer system of claim 1, wherein the non-transitory computer readable medium with computer executable instructions stored thereon further includes instructions which, when executed by the processor, further cause the processor to perform the following method:

calculating the first spectral efficiency value using a weighted average of the first user equipment spectral efficiency values for at least a portion of the plurality of user equipment,

wherein the first spectral efficiency value and the second spectral efficiency value are average values.

3. The networked computer system of claim 2, wherein the non-transitory computer readable medium with computer executable instructions stored thereon further includes instructions which, when executed by the processor, further cause the processor to perform the following method:

calculating second signal strength ratios using the signal strength value;

converting the second signal strength ratios into user equipment interference-free spectral efficiency values for each user equipment of the plurality of user equipment; and

calculating an average interference-free spectral efficiency value using a weighted average of the user equipment interference-free spectral efficiency ratios for at least a portion of the plurality of user equipment,

wherein the first spectral efficiency value is a baseline spectral efficiency value, and the second spectral efficiency value is the average interference-free spectral efficiency value.

4. The networked computer system of claim 3, wherein the first signal strength ratios are carrier to interference plus noise ratios (CINR), and the second signal strength ratios are signal to noise ratios (SNR).

5. The networked computer system of claim 2, wherein the non-transitory computer readable medium with computer executable instructions stored thereon further includes instructions which, when executed by the processor, further cause the processor to perform the following method:

measuring throughput data;

measuring spectral resource usage over the period of time;

converting the spectral resource usage and the throughput into an actual spectral efficiency value for user equipment; and

calculating an average actual spectral efficiency value from the actual spectral efficiency values for user equipment;

wherein the second average spectral efficiency value is the average actual spectral efficiency value.

6. The networked computer system of claim 5, wherein the first user equipment spectral efficiency values are baseline spectral efficiency values.

7. The networked computer system of claim 5, wherein the first user equipment spectral efficiency values are interference-free spectral efficiency values.

8. The system of claim 2, further including determining a calibration function that is then used to calculate the user equipment spectral efficiency values.

9. The system of claim 2, wherein the weights applied to calculate the average interference-free spectral efficiency value are a function of the amount of traffic sent to the plurality of user equipment over a time period.

10. The system of claim 1, wherein calculating the first average spectral efficiency value further includes:

arranging the first user equipment spectral efficiency values in order;

selecting a predetermined percentile of the arranged values that is less than fifty percent; and

selecting a spectral efficiency value corresponding to the predetermined percentile,

wherein the selected spectral efficiency value is the first spectral efficiency value.

11. The system of claim 2, wherein calculating the first average spectral efficiency value further includes:

calculating base station spectral efficiency values for each of a cluster of base stations; and

calculating a cluster spectral efficiency value by averaging the base station spectral efficiency values.

12. A method for evaluating the performance of a cellular communication network, comprising:

measuring a signal strength value for a signal sent by at least one base station and received by a plurality of user equipment;

calculating first signal strength ratios using the first signal strength value;

converting the first signal strength ratio into first user equipment spectral efficiency values for each user equipment of the plurality of user equipment; and

comparing a first spectral efficiency value corresponding to the first user equipment spectral efficiency values to a second spectral efficiency value to evaluate a data efficiency metric associated with an interference reduction scheme that is running on the base station when the signal strength value is measured.

13. The method of claim 12, further comprising:

calculating the first spectral efficiency value using a weighted average of the first user equipment spectral efficiency values for at least a portion of the plurality of user equipment,

wherein the first spectral efficiency value and the second spectral efficiency value are average values.

14. The method of claim 13, further comprising:

calculating second signal strength ratios using the signal strength value;

converting the second signal strength ratios into user equipment interference-free spectral efficiency values for each user equipment of the plurality of user equipment; and

calculating an average interference-free spectral efficiency value using a weighted average of the user equipment interference-free spectral efficiency values for at least a portion of the plurality of user equipment,

wherein the first average spectral efficiency value is a baseline spectral efficiency value, and the second average spectral efficiency value is the average interference-free spectral efficiency value.

15. The method of claim 13, further comprising:

measuring throughput data;

measuring spectral resource usage over the period of time;

converting the spectral resource usage and the throughput into an actual spectral efficiency value for user equipment; and

calculating an average actual spectral efficiency value from the actual spectral efficiency values for user equipment;

wherein the second average spectral efficiency value is the average actual spectral efficiency value.

16. The method of claim 14, wherein the first user equipment spectral efficiency values are interference-free spectral efficiency values.

17. A non-transitory computer readable medium with computer executable instructions stored thereon which, when executed by the processor, perform the following method:

measuring a signal strength value for a signal sent by at least one base station and received by a plurality of user equipment;

calculating first signal strength ratios using the first signal strength value;

converting the first signal strength ratio into first user equipment spectral efficiency values for each user equipment of the plurality of user equipment; and

comparing a first spectral efficiency value corresponding to the first user equipment spectral efficiency values to a second spectral efficiency value to evaluate a data efficiency metric associated with an interference reduction scheme that is running on the base station when the signal strength value is measured.

18. The computer readable medium of claim 17, wherein the non-volatile computer readable medium with computer executable instructions stored thereon includes additional instructions which, when executed by the processor, further perform:

calculating the first spectral efficiency value using a weighted average of the first user equipment spectral efficiency values for at least a portion of the plurality of user equipment,

wherein the first spectral efficiency value and the second spectral efficiency value are average values.

19. The computer readable medium of claim 18, wherein the non-volatile computer readable medium with computer executable instructions stored thereon includes additional instructions which, when executed by the processor, further perform:

calculating second signal strength ratios using the signal strength value;

converting the second signal strength ratios into user equipment interference-free spectral efficiency values for each user equipment of the plurality of user equipment; and

calculating an average interference-free spectral efficiency value using a weighted average of the user equipment interference-free spectral efficiency values for at least a portion of the plurality of user equipment,

wherein the first average spectral efficiency value is a baseline spectral efficiency value, and the second average spectral efficiency value is the average interference-free spectral efficiency value.

20. The computer readable medium of claim 18, wherein the non-volatile computer readable medium with computer executable instructions stored thereon includes additional instructions which, when executed by the processor, further perform:

measuring throughput data;

measuring spectral resource usage over the period of time;

converting the spectral resource usage and the throughput into an actual spectral efficiency value for user equipment; and

calculating an average actual spectral efficiency value from the actual spectral efficiency values for user equipment;

wherein the second average spectral efficiency value is the average actual spectral efficiency value.