COORDINATED MULTIPOINT (COMP) TRANSMISSION METHOD SELECTION AND FEEDBACK REQUIREMENTS

• US 20130021925A1
• Filed: 07/22/2011
• Published: 01/24/2013
• Est. Priority Date: 07/22/2011
• Status: Abandoned Application

• Current Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yin, Zhanping, Khoshnevis, Ahmad, Choudhury, Sayantan
• Application Number:
  US13/189,420
• Publication Number:
  US 20130021925A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A method for configuring coordinated multipoint (CoMP) transmission by an eNode B is described. Feedback information is received from a user equipment (UE). A CoMP transmission measurement set is determined. The CoMP transmission measurement set is sent to the UE. A channel state information (CSI) report of the CoMP measurement set is received from the UE. A CoMP transmission method used for each CoMP transmission point in the CoMP measurement set is selected.

Claims

1. A method for configuring coordinated multipoint (CoMP) transmission by an eNode B, comprising:

receiving feedback information from a user equipment (UE);

determining a CoMP transmission measurement set;

sending the CoMP transmission measurement set to the UE;

receiving a channel state information (CSI) report of the CoMP measurement set from the UE; and

selecting a CoMP transmission method used for each CoMP transmission point in the CoMP measurement set.

2. The method of claim 1, further comprising reconfiguring feedback requirements for each CoMP transmission point based on the selected CoMP transmission method used for each CoMP transmission point.

3. The method of claim 1, wherein the feedback information comprises a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

4. The method of claim 1, wherein determining a CoMP transmission measurement set comprises:

determining CoMP transmission candidate points of the UE; and

adding a CoMP transmission candidate point to the CoMP transmission measurement set if an interference level of the CoMP transmission candidate point is more than a CoMP transmission threshold.

5. The method of claim 1, further comprising configuring a channel state information reference signal (CSI-RS) of the CoMP transmission points in the CoMP transmission measurement set.

6. The method of claim 1, wherein selecting a CoMP transmission method comprises determining whether an interference level of a CoMP transmission point with a best precoding matrix indicator (PMI) is lower than a coordinated beamforming/coordinated scheduling (CS/CB) threshold.

7. The method of claim 6, wherein the interference level of the CoMP transmission point with a best PMI is lower than the CS/CB threshold, and further comprising setting no CoMP transmission method for the CoMP transmission point.

8. The method of claim 6, wherein the interference level of the CoMP transmission point with a best PMI is not lower than the CS/CB threshold, and further comprising determining whether an interference level of the CoMP transmission point with a worst PMI is lower than the CS/CB threshold.

9. The method of claim 8, wherein the interference level of the CoMP transmission point with a worst PMI is not lower than the CS/CB threshold, and wherein joint processing (JP) is selected as the CoMP transmission method.

10. The method of claim 9, further comprising selecting between joint transmission (JT) and dynamic point selection (DPS) as a CoMP transmission sub-method.

11. The method of claim 8, wherein the interference level of the CoMP transmission point with a worst PMI is lower than the CS/CB threshold, and further comprising determining whether the eNode B can schedule a suitable UE in the CoMP transmission point for CS/CB.

12. The method of claim 11, wherein the eNode B can not schedule a suitable UE in the CoMP transmission point for CS/CB, and wherein joint processing (JP) is selected as the CoMP transmission method.

13. The method of claim 12, further comprising selecting between joint transmission (JT) and dynamic point selection (DPS) as a CoMP transmission sub-method.

14. The method of claim 11, wherein the eNode B can schedule a suitable UE in the CoMP transmission point for CS/CB, and further comprising determining whether increasing UE throughput is more desirable.

15. The method of claim 14, wherein increasing UE throughput is more desirable, and wherein joint processing (JP) is selected as the CoMP transmission method.

16. The method of claim 15, further comprising selecting between joint transmission (JT) and dynamic point selection (DPS) as a CoMP transmission sub-method.

17. The method of claim 14, wherein increasing UE throughput is not more desirable, and wherein CS/CB is selected as the CoMP transmission method.

18. The method of claim 1, wherein the CSI report comprises at least one of a relative phase between a serving cell and a CoMP transmission point, a relative signal strength between the serving cell with a best precoding matrix indicator (PMI) and a CoMP transmission point, a relative strength between a signal with a worst PMI and a best PMI of a CoMP transmission point and a relative strength between a CoMP transmission point with a worst PMI and a serving cell with a best PMI.

19. An eNode B for configuring coordinated multipoint (CoMP) transmission, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable to;

receive feedback information from a user equipment (UE);

determine a CoMP transmission measurement set;

send the CoMP transmission measurement set to the UE;

receive a channel state information (CSI) report of the CoMP measurement set from the UE; and

select a CoMP transmission method used for each CoMP transmission point in the CoMP measurement set.

20. The eNode B of claim 19, wherein the instructions are further executable to reconfigure feedback requirements for each CoMP transmission point based on the selected CoMP transmission method used for each CoMP transmission point.

21. The eNode B of claim 19, wherein the feedback information comprises a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

22. The eNode B of claim 19, wherein the instructions executable to determine a CoMP transmission measurement set comprise instructions executable to:

determine CoMP transmission candidate points of the UE; and

add a CoMP transmission candidate point to the CoMP transmission measurement set if an interference level of the CoMP transmission candidate point is more than a CoMP transmission threshold.

23. The eNode B of claim 19, wherein the instructions are further executable to configure a channel state information reference signal (CSI-RS) of the CoMP transmission points in the CoMP transmission measurement set.

24. The eNode B of claim 19, wherein the instructions executable to select a CoMP transmission method comprise instructions executable to determine whether an interference level of a CoMP transmission point with a best precoding matrix indicator (PMI) is lower than a coordinated beamforming/coordinated scheduling (CS/CB) threshold.

25. The eNode B of claim 24, wherein the interference level of the CoMP transmission point with the best PMI is lower than the CS/CB threshold, and wherein the instructions are further executable to set no CoMP transmission method for the CoMP transmission point.

26. The eNode B of claim 24, wherein the interference level of the CoMP transmission point with the best PMI is not lower than the CS/CB threshold, and wherein the instructions are further executable to determine whether an interference level of the CoMP transmission point with a worst PMI is lower than the CS/CB threshold.

27. The eNode B of claim 26, wherein the interference level of the CoMP transmission point with the worst PMI is not lower than the CS/CB threshold, and wherein joint processing (JP) is selected as the CoMP transmission method.

28. The eNode B of claim 27, wherein the instructions are further executable to select between joint transmission (JT) and dynamic point selection (DPS) as a CoMP transmission sub-method.

29. The eNode B of claim 26, wherein the interference level of the CoMP transmission point with the worst PMI is lower than the CS/CB threshold, and wherein the instructions are further executable to determine whether the eNode B can schedule a suitable UE in the CoMP transmission point for CS/CB.

30. The eNode B of claim 29, wherein the eNode B can not schedule a suitable UE in the CoMP transmission point for CS/CB, and wherein joint processing (JP) is selected as the CoMP transmission method.

31. The eNode B of claim 30, wherein the instructions are further executable to select between joint transmission (JT) and dynamic point selection (DPS) as a CoMP transmission sub-method.

32. The eNode B of claim 29, wherein the eNode B can schedule a suitable UE in the CoMP transmission point for CS/CB, and wherein the instructions are further executable to determine whether increasing UE throughput is more desirable.

33. The eNode B of claim 32, wherein increasing UE throughput is more desirable, and wherein joint transmission (JT) is selected as the CoMP transmission method.

34. The eNode B of claim 33, wherein the instructions are further executable to select between joint processing (JP) and dynamic point selection (DPS) as a CoMP transmission sub-method.

35. The eNode B of claim 32, wherein increasing UE throughput is not more desirable, and wherein CS/CB is selected as the CoMP transmission method.

36. The eNode B of claim 19, wherein the CSI report comprises at least one of a relative phase between a serving cell and a CoMP transmission point, a relative signal strength between the serving cell with a best precoding matrix indicator (PMI) and a CoMP transmission point, a relative strength between a signal with a worst PMI and a best PMI of a CoMP transmission point and a relative strength between a CoMP transmission point with a worst PMI and a serving cell with a best PMI.

37. A method for sending feedback corresponding to coordinated multipoint (CoMP) transmission operations, comprising:

sending feedback information to a serving cell;

receiving a CoMP transmission measurement set from the serving cell;

measuring channel state information (CSI) for each CoMP transmission point in the CoMP transmission measurement set;

generating a CSI report that comprises the CSI; and

sending the CSI report to the serving cell.

38. The method of claim 37, wherein the serving cell is an eNode B.

39. The method of claim 37, wherein the feedback information comprises a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

40. The method of claim 37, wherein the CSI comprises a relative phase between the serving cell and a CoMP transmission point.

41. The method of claim 37, wherein the CSI comprises a relative signal strength between the serving cell with a best precoding matrix indicator (PMI) and a CoMP transmission point.

42. The method of claim 37, wherein the CSI comprises a relative strength between a signal with a worst precoding matrix indicator (PMI) and a best PMI of a CoMP transmission point.

43. The method of claim 37, wherein the method is performed by a user equipment (UE).

44. The method of claim 43, wherein the UE is in a cell edge region, and wherein each CoMP transmission point in the CoMP transmission measurement set is a neighbor cell to the UE.

45. A user equipment (UE) configured for sending feedback corresponding to coordinated multipoint (CoMP) transmission operations, comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to;

send feedback information to a serving cell;

receive a CoMP transmission measurement set from the serving cell;

measure channel state information (CSI) for each CoMP transmission point in the CoMP transmission measurement set;

generate a CSI report that comprises the CSI; and

send the CSI report to the serving cell.

46. The UE of claim 45, wherein the serving cell is an eNode B.

47. The UE of claim 45, wherein the feedback information comprises a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

48. The UE of claim 45, wherein the CSI comprises a relative phase between the serving cell and a CoMP transmission point.

49. The UE of claim 45, wherein the CSI comprises a relative signal strength between the serving cell with a best precoding matrix indicator (PMI) and a CoMP transmission point.

50. The UE of claim 45, wherein the CSI comprises a relative strength between a signal with a worst precoding matrix indicator (PMI) and a best PMI of a CoMP transmission point.

51. The UE of claim 45, wherein the UE is in a cell edge region, and wherein each CoMP transmission point in the CoMP transmission measurement set is a neighbor cell to the UE.