Interference management based on enhanced pilot measurement reports

• US 8,599,705 B2
• Filed: 01/26/2009
• Issued: 12/03/2013
• Est. Priority Date: 02/01/2008
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Agrawal, Avneesh, Khandekar, Aamod D., Bhushan, Naga, Gorokhov, Alexei Y., Palanki, Ravi
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): BROCKMAN, ANGEL T
• Application Number:
  US12/359,612
• Publication Number:
  US 20100039948A1
• Time in Patent Office: 1,772 Days
• Field of Search: 370/252, 370/329
• US Class Current: 370/252
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Techniques for managing interference in a wireless network are described. A base station may receive enhanced pilot measurement reports from user equipments (UEs) and may make an interference management decision based on the received reports. The base station may select a serving base station for a UE based on an enhanced pilot measurement report received from the UE. The base station may determine resources with a low target interference level at a neighbor base station and may avoid scheduling a UE for uplink transmission on the resources. The base station may also determine whether to reserve resources for a neighbor base station based on data performance of the neighbor base station, whether the neighbor base station observes high interference from UEs served by the base station, or whether UEs served by the neighbor base station observe high interference from the base station, which may be determined based on the enhanced pilot measurement reports.

Claims

1. A method for wireless communication, comprising:

receiving enhanced pilot measurement reports from a plurality of user equipments at a first base station, each enhanced pilot measurement report including pilot measurements for a set of base stations and further including base station information broadcast by base stations in the set of base stations; and

making a decision relating to resource allocation, or scheduling, or both affecting at least one of the plurality of user equipments based on the pilot measurements and the base station information in the received enhanced pilot measurement reports.

2. The method of claim 1, wherein the base station information in each enhanced pilot measurement report includes at least one of a transmit power level of each base station in the set of base stations, pathloss for each base station, loading of each base station, achieved data performance of each base station, an interference level observed by each base station, or a target interference level for each base station.

3. The method of claim 1, wherein each enhanced pilot measurement report further includes at least one of achieved data performance of a user equipment sending the enhanced pilot measurement report, data requirements of a user equipment, an interference level observed by the user equipment, or a target interference level for the user equipment.

4. The method of claim 1, further comprising:

selecting a high-power base station or a low-power base station to serve a user equipment based on an enhanced pilot measurement report received from the user equipment.

5. The method of claim 1, further comprising:

determining pathloss from a user equipment to each base station in a set of base stations included in an enhanced pilot measurement report received from the user equipment, and

selecting one base station in the set of base stations to serve the user equipment based on the pathloss for each base station in the set of base stations.

6. The method of claim 5, wherein the determining the pathloss from the user equipment to each base station comprises

obtaining a transmit power level of the base station from the enhanced pilot measurement report,

obtaining a received power level of the base station at the user equipment from the enhanced pilot measurement report, and

determining the pathloss from the user equipment to the base station based on the transmit power level and the received power level of the base station.

7. The method of claim 1, wherein the making a decision comprises

determining resources with a low target interference level on uplink at a second base station based on the enhanced pilot measurement reports, and

avoiding scheduling a user equipment for uplink transmission on the resources to reduce interference to the second base station.

8. The method of claim 1, wherein the making a decision comprises determining whether to reserve resources for a second base station based on the enhanced pilot measurement reports.

9. The method of claim 8, wherein the reserved resources comprise at least one interlace on uplink, or at least one subband on the uplink, or at least one interlace on downlink, or at least one subband on the downlink, or a combination thereof.

10. The method of claim 8, further comprising:

broadcasting the reserved resources for the second base station to user equipments within reception range of the first base station.

11. The method of claim 1, wherein the making a decision comprises

determining whether a second base station observes high interference from user equipments served by the first base station based on the enhanced pilot measurement reports, and

reserving resources on uplink for the second base station if the second base station observes high interference from the user equipments served by the first base station.

12. The method of claim 1, wherein the making a decision comprises

determining whether user equipments served by a second base station observe high interference from the first base station based on the enhanced pilot measurement reports, and

reserving resources on downlink for the second base station if the user equipments served by the second base station observe high interference from the first base station.

13. The method of claim 1, wherein the making a decision comprises

determining data performance of a second base station based on the enhanced pilot measurement reports, and

determining whether to reserve resources for the second base station based on the data performance of the second base station and data performance of the first base station.

14. The method of claim 1, wherein the making a decision comprises determining a transmit power level of the first base station based on the enhanced pilot measurement report.

15. The method of claim 1, further comprising:

sending a broadcast transmission comprising information for the first base station, the information for the first base station being used for enhanced pilot measurement reports sent by user equipments detecting the first base station.

16. The method of claim 1, further comprising:

sending a low reuse pilot from the first base station for use by user equipments to detect the first base station.

17. An apparatus for wireless communication, comprising:

at least one processor configured to;

receive enhanced pilot measurement reports from a plurality of user equipments at a first base station, each enhanced pilot measurement report including pilot measurements for a set of base stations and further including base station information broadcast by base stations in the set of base stations, and

make a decision relating to resource allocation, or scheduling, or both affecting at least one of the plurality of user equipments based on the pilot measurements and the base station information in the received enhanced pilot measurement reports.

18. The apparatus of claim 17, wherein the at least one processor is configured to determine pathloss from a user equipment to each base station in a set of base stations included in an enhanced pilot measurement report received from the user equipment, and to select one base station in the set of base stations to serve the user equipment based on the pathloss for each base station in the set of base stations.

19. The apparatus of claim 17, wherein the at least one processor is configured to determine resources with a low target interference level on uplink at a second base station based on the enhanced pilot measurement reports, and to avoid scheduling a user equipment for uplink transmission on the resources to reduce interference to the second base station.

20. The apparatus of claim 17, wherein the at least one processor is configured to determine whether to reserve resources for a second base station based on the enhanced pilot measurement reports.

21. An apparatus for wireless communication, comprising:

means for receiving enhanced pilot measurement reports from a plurality of user equipments at a first base station, each enhanced pilot measurement report including pilot measurements for a set of base stations and further including base station information broadcast by base stations in the set of base stations; and

means for making a decision relating to resource allocation, or scheduling, or both affecting at least one of the plurality of user equipments based on the pilot measurements and the base station information in the received enhanced pilot measurement reports.

22. The apparatus of claim 21, further comprising:

means for determining pathloss from a user equipment to each base station in a set of base stations included in an enhanced pilot measurement report received from the user equipment, and

means for selecting one base station in the set of base stations to serve the user equipment based on the pathloss for each base station in the set of base stations.

23. The apparatus of claim 21, wherein the means for making a decision comprises

means for determining resources with a low target interference level on uplink at a second base station based on the enhanced pilot measurement reports, and

means for avoiding scheduling a user equipment for uplink transmission on the resources to reduce interference to the second base station.

24. The apparatus of claim 21, wherein the means for making a decision comprises means for determining whether to reserve resources for a second base station based on the enhanced pilot measurement reports.

25. A computer program product, comprising:

a non-transitory computer-readable medium comprising;

code for causing at least one computer to receive enhanced pilot measurement reports from a plurality of user equipments at a first base station, each enhanced pilot measurement report including pilot measurements for a set of base stations and further including base station information broadcast by base stations in the set of base stations, and

code for causing the at least one computer to make a decision relating to resource allocation, or scheduling, or both affecting at least one of the plurality of user equipments based on the pilot measurements and the base station information in the received enhanced pilot measurement reports.

26. A method for wireless communication, comprising:

generating an enhanced pilot measurement report including pilot measurements for a set of base stations detected by a user equipment and further including base station information broadcast by base stations in the set of base stations; and

sending the enhanced pilot measurement report to at least one base station in the set of base stations for use to make decisions relating to resource allocation, or scheduling, or both affecting at least one user equipment based on the pilot measurements and the base station information in the enhanced pilot measurement report.

27. The method of claim 26, further comprising:

receiving broadcast transmissions from the base stations in the set of base stations; and

obtaining the base station information from the broadcast transmissions.

28. The method of claim 26, wherein the enhanced pilot measurement report includes at least one of a transmit power level of each base station in the set of base stations, pathloss for each base station, loading of each base station, achieved data performance of each base station, an interference level observed by each base station, or a target interference level for each base station.

29. The method of claim 26, wherein the base station information in the enhanced pilot measurement report includes at least one of achieved data performance of the user equipment, data requirements of the user equipment, an interference level observed by the user equipment, or a target interference level for the user equipment.

30. The method of claim 26, further comprising:

communicating with a serving base station selected for the user equipment based on the enhanced pilot measurement report.

31. The method of claim 30, wherein the serving base station is selected based on pathloss or data performance determined based on the enhanced pilot measurement report.

32. The method of claim 26, wherein the at least one base station comprises at least one of a serving base station for the user equipment, base stations causing high interference to the user equipment on downlink, or base stations observing high interference from the user equipment on uplink.

33. An apparatus for wireless communication, comprising:

at least one processor configured to;

generate an enhanced pilot measurement report including pilot measurements for a set of base stations detected by a user equipment and further including base station information broadcast by base stations in the set of base stations, and

send the enhanced pilot measurement report to at least one base station in the set of base stations for use to make decisions relating to resource allocation, or scheduling, or both affecting at least one user equipment based on the pilot measurements and the base station information in the enhanced pilot measurement report.

34. The apparatus of claim 33, wherein the at least one processor is configured to receive broadcast transmissions from the base stations in the set of base stations, and to obtain the base station information from the broadcast transmissions.

35. The apparatus of claim 33, wherein the at least one processor is configured to communicate with a serving base station selected for the user equipment based on the enhanced pilot measurement report.