Maintaining high signal quality in mobile wireless networks using signal relative importance values

• US 9,232,413 B2
• Filed: 05/02/2013
• Issued: 01/05/2016
• Est. Priority Date: 05/02/2013
• Status: Active Grant

• Current Assignee: United States Cellular Corporation (Telephone & Data Systems, Inc.)
• Original Assignee: United States Cellular Corporation (Telephone & Data Systems, Inc.)
• Inventors: Vela, Mario, Irizarry, Michael Shannon, Saxena, Narothum
• Primary Examiner(s): Elhag, Magdi
• Application Number:
  US13/875,841
• Publication Number:
  US 20140328188A1
• Time in Patent Office: 978 Days
• Field of Search: 455/422.1, 455/423, 455/436, 455/437, 455/446, 455/449, 370/252.328, 370/331, 370/332, 370/252, 370/328
• US Class Current: 1/1
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists

Abstract

A computer-automated method is described for identifying and carrying out reconfiguration actions for a transmitter in a radio network. A computer system is configured to determine, for a first transmitter, a multitude of relative importance values for signal data points relating to the first transmitter, the signal data points being acquired by mobile wireless devices from the first transmitter. Each relative importance value is determined by: (1) calculating a relative relevance for a first signal data point for the first transmitter, acquired by a first mobile wireless device, by comparing a first value for the first signal data point to a second value for a second transmitter, (2) calculating, by a fuzzy logic engine, a quality for the first signal data point, and (3) rendering a relative importance value based upon the relative relevance and the quality for the first signal data point. The results are thereafter used to carry out a reconfiguration action upon at least one transmitter based upon the multitude of relative importance values.

Claims

1. A method, implemented on a computer system, for identifying and carrying out reconfiguration actions for a transmitter in a radio network, the method comprising:

determining, for a first transmitter, a multitude of relative importance values for signal data points relating to the first transmitter, the signal data points being acquired by mobile wireless devices from the first transmitter, each relative importance value being determined by;

calculating a relative relevance for a first signal data point for the first transmitter, acquired by a first mobile wireless device, by comparing a first value for the first signal data point to a second value for a second signal data point for a second transmitter, where the first value and the second value are acquired by the mobile wireless device at a same location,

calculating, by a fuzzy logic engine, a quality for the first signal data point, and

rendering a relative importance value based upon the relative relevance and the quality for the first signal data point; and

carrying out a reconfiguration action upon at least one transmitter based upon the multitude of relative importance values.

2. The method of claim 1 further comprising:

binning the multitude of relative importance values to render a set of count values for individual ones of the multitude of relative importance values within sub-ranges of potential relative importance values; and

identifying a correctable signal condition for the first transmitter, the identifying comprising applying a histogram profile pattern definition corresponding to the correctable signal condition to the set of count values rendered by the binning.

3. The method of claim 2 wherein the transmitter corresponds to a sector of a cellular network base station.

4. The method of claim 2 wherein rendering the relative importance value comprises apply a maximum value function upon normalized values for both the relative relevance and the quality for the first signal data point.

5. The method of claim 2 wherein the relative relevance is a normalized relative relevance value that is determined by applying a logit function to a difference value arising from the comparing the first value for the first signal data point to the second value for a second transmitter.

6. The method of claim 2 wherein calculating the relative relevance for the first signal data point includes applying a correction value, based upon a number of transmitters simultaneously sensed by the first mobile wireless device at a time of receiving the first signal data point, to a delta value arising from comparing the first value to the second value,

wherein the correction value increases the relative relevance for the first signal data point as the number of transmitters decreases from a maximum correction transmitter number to a minimum transmitter number of two transmitters.

7. The method of claim 6 wherein the maximum correction transmitter number for which the correction value modifies the relative relevance is five transmitters.

8. The method of claim 2 wherein the signal data points relating to the first transmitter are signal-to-noise ratio data points.

9. The method of claim 2 wherein the signal data point is acquired by analysis of a message from the transmitter bearing signal-to-noise information, the message being of a type taking from the group consisting of:

a Pilot Strength Message provided in CDMA networks;

a Route Update Message provided in EV-DO networks; and

a Measurement Report Message provided in LTE networks.

10. The method of claim 2 wherein the correctable signal condition for the first transmitter is an over-reaching condition in the transmitter.

11. The method of claim 2 wherein the correctable signal condition for the first transmitter is an under-reaching condition in the transmitter.

12. The method of claim 2 wherein the correctable signal condition for the first transmitter is corrected by issuing, by a programmed closed loop controller, a remedial command to a power level controller for the transmitter.

13. The method of claim 1 wherein the signal data points are derived from messages including a reference transmitter, the reference transmitter being a transmitter of interest and having a plurality of neighboring transmitters for which a hand-off list is maintained for the transmitter of interest, the method further comprising:

summing the multitude of relative importance values to render a set of relative importance value sums, each sum corresponding to one of the plurality of neighboring transmitters enumerated in the hand-off list for the transmitter of interest, and

wherein individual ones of the relative importance values used to create the relative importance value sums is assigned based upon relative importance values calculated for signal data points derived from messages wherein the transmitter/sector of interest is identified as the reference transmitter/sector.

14. The method of claim 13 further comprising:

configuring a rank order listing of the set of relative importance value sums based upon their value, the rank order listing being used to establish a preferred hand-off partner for the transmitter of interest.

15. The method of claim 1 where the first value and the second value are acquired by the mobile wireless device at a same point in time.

16. A non-transitory computer-readable medium including computer executable instructions for identifying and carrying out reconfiguration actions for a transmitter in a radio network, the computer-executable being executed on a computer system to facilitate performing the steps of:

determining, for a first transmitter, a multitude of relative importance values for signal data points relating to the first transmitter, the signal data points being acquired by mobile wireless devices from the first transmitter, each relative importance value being determined by;

calculating a relative relevance for a first signal data point for the first transmitter, acquired by a first mobile wireless device, by comparing a first value for the first signal data point to a second value for a second signal data point for a second transmitter, where the first value and the second value are acquired by the mobile wireless device at a same location,

calculating, by a fuzzy logic engine, a quality for the first signal data point, and

rendering a relative importance value based upon the relative relevance and the quality for the first signal data point; and

carrying out a reconfiguration action upon at least one transmitter based upon the multitude of relative importance values.

17. The non-transitory computer-readable medium of claim 16 further comprising computer-executable instructions for:

binning the multitude of relative importance values to render a set of count values for individual ones of the multitude of relative importance values within sub-ranges of potential relative importance values; and

identifying a correctable signal condition for the first transmitter, the identifying comprising applying a histogram profile pattern definition corresponding to the correctable signal condition to the set of count values rendered by the binning.

18. The non-transitory computer-readable medium of claim 16 wherein the signal data points are derived from messages including a reference transmitter, the reference transmitter being a transmitter of interest and having a plurality of neighboring transmitters for which a hand-off list is maintained for the transmitter of interest, the computer-executable instructions further comprising instructions executed on the computer system to facilitate performing the steps of:

summing the multitude of relative importance values to render a set of relative importance value sums, each sum corresponding to one of the plurality of neighboring transmitters enumerated in the hand-off list for the transmitter of interest, wherein individual ones of the relative importance values used to create the relative importance value sums is assigned based upon relative importance values calculated for signal data points derived from messages wherein the transmitter/sector of interest is identified as the reference transmitter/sector; and

configuring a rank order listing of the set of relative importance value sums based upon their value, the rank order listing being used to establish a preferred hand-off partner for the transmitter of interest.

19. The non-transitory computer-readable medium of claim 16 where the first value and the second value are acquired by the mobile wireless device at a same point in time.

20. A computer system including:

a processor; and

a non-transitory computer-readable medium including computer executable instructions for identifying and carrying out reconfiguration actions for a transmitter in a radio network, the computer-executable being executed on the processor of the computer system to facilitate performing the steps of;

determining, for a first transmitter, a multitude of relative importance values for signal data points relating to the first transmitter, the signal data points being acquired by mobile wireless devices from the first transmitter, each relative importance value being determined by;

calculating a relative relevance for a first signal data point for the first transmitter, acquired by a first mobile wireless device, by comparing a first value for the first signal data point to a second value for a second signal data point for a second transmitter, where the first value and the second value are acquired by the mobile wireless device at a same location,

calculating, by a fuzzy logic engine, a quality for the first signal data point, and

rendering a relative importance value based upon the relative relevance and the quality for the first signal data point; and

carrying out a reconfiguration action upon at least one transmitter based upon the multitude of relative importance values.

21. The computer system of claim 20 wherein the non-transitory computer-readable medium further comprises computer-executable instructions for:

binning the multitude of relative importance values to render a set of count values for individual ones of the multitude of relative importance values within sub-ranges of potential relative importance values; and

identifying a correctable signal condition for the first transmitter, the identifying comprising applying a histogram profile pattern definition corresponding to the correctable signal condition to the set of count values rendered by the binning.

22. The computer system of claim 20 wherein the signal data points are derived from messages including a reference transmitter, the reference transmitter being a transmitter of interest and having a plurality of neighboring transmitters for which a hand-off list is maintained for the transmitter of interest, the computer-executable instructions further comprising instructions executed on the computer system to facilitate performing the steps of:

summing the multitude of relative importance values to render a set of relative importance value sums, each sum corresponding to one of the plurality of neighboring transmitters enumerated in the hand-off list for the transmitter of interest, wherein individual ones of the relative importance values used to create the relative importance value sums is assigned based upon relative importance values calculated for signal data points derived from messages wherein the transmitter/sector of interest is identified as the reference transmitter/sector; and

configuring a rank order listing of the set of relative importance value sums based upon their value, the rank order listing being used to establish a preferred hand-off partner for the transmitter of interest.

23. The system of claim 20 where the first value and the second value are acquired by the mobile wireless device at a same point in time.