Interference management and network performance optimization in small cells

• US 9,060,289 B2
• Filed: 04/22/2013
• Issued: 06/16/2015
• Est. Priority Date: 04/23/2012
• Status: Active Grant

• Current Assignee: Wildfire.Exchange, Inc. (Plume Design, Inc.)
• Original Assignee: Wildfire.Exchange, Inc. (Plume Design, Inc.)
• Inventors: Madan, Ritesh K., Chandrasekhar, Vikram, Goldsmith, Andrea, Krishna, Santhosh
• Primary Examiner(s): Siddiqui, Kashif
• Application Number:
  US13/867,993
• Publication Number:
  US 20130281089A1
• Time in Patent Office: 785 Days
• Field of Search: 455418-420, 455/434, 455450-453, 455/522, 370328-338
• US Class Current: 1/1
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method of configuring small cell base stations in a cellular network is disclosed. A constraint on a performance-related metric associated with at least a portion of the cellular network is received. In some embodiments, the constraint on the performance-related metric comprises a constraint on a performance-related metric associated with one or more macrocells. Measurement data from one or more small cell base stations is received via a control interface. One or more optimized values of one or more parameters associated with one or more small cell base stations are searched. The searching is based at least in part on the received measurement data and subject to the constraint on the performance-related metric associated with the at least a portion of the cellular network. The one or more optimized values of the one or more parameters to the associated small cell base stations are transmitted.

Claims

1. A method of configuring small cell base stations in a cellular network, comprising:

receiving a constraint on a performance-related metric associated with at least a portion of the cellular network;

receiving measurement data from one or more small cell base stations via a control interface;

searching, using a processor, for one or more optimized values of one or more parameters associated with one or more small cell base stations, wherein the searching is based at least in part on the received measurement data and subject to the constraint on the performance-related metric associated with the at least a portion of the cellular network, wherein the one or more parameters comprise a parameter corresponding to a cell range extension bias towards a small cell base station, and wherein the searching optimizes the parameter corresponding to the cell range extension bias based on whether the small cell base station is integrated with or co-located with a Wi-Fi access point; and

transmitting the one or more optimized values of the one or more parameters to the associated small cell base stations.

2. The method of claim 1, where the constraint on the performance-related metric comprises a constraint on a performance-related metric associated with one or more macrocells.

3. The method of claim 1, wherein the searching is based on a set of network performance optimization goals.

4. The method of claim 3, wherein the network optimization goal comprises one of the following:

increasing the average network throughput, increasing the geometric mean throughput, reducing interference, reducing outage probability, increasing coverage, improving fairness, and supporting specific quality-of-service metrics for high-priority traffic.

5. The method of claim 3, wherein the set of network performance optimization goals comprises one of the following:

network performance optimization goals corresponding to small cells, network performance optimization goals corresponding to macrocells, and a weighted combination of network performance optimization goals corresponding to small cells and macrocells.

6. The method of claim 1, wherein the performance-related metric comprises one of the following:

interference, throughput, delay, number of dropped calls, and coverage.

7. The method of claim 1, wherein the measurement data comprises measurement data collected by a small cell base station from a user equipment (UE) connected to the small cell base station.

8. The method of claim 7, wherein the measurement data collected by the small cell base station comprises information corresponding to the UE.

9. The method of claim 7, wherein the measurement data collected by the small cell base station comprises information corresponding to a neighboring base station that the UE can hear from.

10. The method of claim 1, wherein the measurement data comprises measurement data collected by a small cell base station from a neighboring base station.

11. The method of claim 1, wherein the measurement data comprises one of the following:

signal strength, interference, channel quality, throughput, packet error rate, and load information.

12. The method of claim 1, wherein the one or more parameters comprise a parameter corresponding to one of the following:

frequency channel, fractional frequency reuse, power, interference coordination, antenna, time-division, cell range extension, and handoff.

13. The method of claim 1, wherein two or more parameters are jointly optimized.

14. The method of claim 1, further comprising:

detecting whether a base station has failed or whether a new base station has been installed; and

initiating the search in response to the detection.

15. The method of claim 1, wherein the searching is performed periodically and wherein the measurement data is received periodically.

16. The method of claim 1, further comprising:

receiving additional measurement data from another manager managing a macrocell base station; and

wherein the searching of the one or more optimized values of the one or more parameters is further based on the additional measurement data.

17. A cellular network manager for configuring small cell base stations in a cellular network, comprising:

a control interface in communication with a plurality of small cell base stations;

a processor; and

a memory storing a set of network performance optimization goals, wherein the memory is coupled with the processor, and wherein the memory is configured to provide the processor with instructions which when executed cause the processor to;

receive a constraint on a performance-related metric associated with at least a portion of the cellular network;

receive measurement data from one or more small cell base stations;

search for one or more optimized values of one or more parameters associated with one or more small cell base stations, wherein the searching is based at least in part on the received measurement data and subject to the constraint on the performance-related metric associated with the at least a portion of the cellular network, wherein the one or more parameters comprise a parameter corresponding to a cell range extension bias towards a small cell base station, and wherein the searching optimizes the parameter corresponding to the cell range extension bias based on whether the small cell base station is integrated with or co-located with a Wi-Fi access point; and

transmit the one or more optimized values of the one or more parameters to the associated small cell base stations.

18. The system of claim 17, where the constraint on the performance-related metric comprises a constraint on a performance-related metric associated with one or more macrocells.

19. The system of claim 17, wherein the searching is based on a set of network performance optimization goals.

20. The system of claim 19, wherein the network optimization goal comprises one of the following:

increasing the average network throughput, increasing the geometric mean throughput, reducing interference, reducing outage probability, increasing coverage, improving fairness, and supporting specific quality-of-service metrics for high-priority traffic.

21. The system of claim 19, wherein the set of network performance optimization goals comprises one of the following:

network performance optimization goals corresponding to small cells, network performance optimization goals corresponding to macrocells, and a weighted combination of network performance optimization goals corresponding to small cells and macrocells.

22. The system of claim 17, wherein the performance-related metric comprises one of the following:

interference, throughput, delay, number of dropped calls, and coverage.

23. The system of claim 17, wherein the measurement data comprises measurement data collected by a small cell base station from a user equipment (UE) connected to the small cell base station.

24. The system of claim 23, wherein the measurement data collected by the small cell base station comprises information corresponding to the UE.

25. The system of claim 23, wherein the measurement data collected by the small cell base station comprises information corresponding to a neighboring base station that the UE can hear from.

26. The system of claim 17, wherein the measurement data comprises measurement data collected by a small cell base station from a neighboring base station.

27. The system of claim 17, wherein the measurement data comprises one of the following:

signal strength, interference, channel quality, throughput, packet error rate, and load information.

28. The system of claim 17, wherein the one or more parameters comprise a parameter corresponding to one of the following:

frequency channel, fractional frequency reuse, power, interference coordination, antenna, time-division, cell range extension, and handoff.

29. The system of claim 17, wherein two or more parameters are jointly optimized.

30. The system of claim 17, wherein the memory is further configured to provide the processor with instructions which when executed cause the processor to:

detect whether a base station has failed or whether a new base station has been installed; and

initiate the search in response to the detection.

31. The system of claim 17, wherein the searching is performed periodically and wherein the measurement data is received periodically.

32. The system of claim 17, wherein the memory is further configured to provide the processor with instructions which when executed cause the processor to:

receive additional measurement data from another manager managing a macrocell base station; and

wherein the searching of the one or more optimized values of the one or more parameters is further based on the additional measurement data.

33. A computer program product for configuring small cell base stations in a cellular network, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:

receiving a constraint on a performance-related metric associated with at least a portion of the cellular network;

receiving measurement data from one or more small cell base stations via a control interface;

searching, using a processor, for one or more optimized values of one or more parameters associated with one or more small cell base stations, wherein the searching is based at least in part on the received measurement data and subject to the constraint on the performance-related metric associated with the at least a portion of the cellular network, wherein the one or more parameters comprise a parameter corresponding to a cell range extension bias towards a small cell base station, and wherein the searching optimizes the parameter corresponding to the cell range extension bias based on whether the small cell base station is integrated with or co-located with a Wi-Fi access point; and

transmitting the one or more optimized values of the one or more parameters to the associated small cell base stations.

34. The computer program product of claim 33, where the constraint on the performance-related metric comprises a constraint on a performance-related metric associated with one or more macrocells.