SOUNDING REFERENCE SIGNAL ENHANCEMENTS FOR WIRELESS COMMUNICATION

• US 20110294529A1
• Filed: 12/01/2010
• Published: 12/01/2011
• Est. Priority Date: 12/03/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Montojo, Juan, Chen, Wanshi, Gaal, Peter, Luo, Xiliang
• Granted Patent: US 9,531,514 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

A wireless communication method includes determining whether a wireless device desires dynamic sounding reference signal (SRS) resources and providing, based on the determination, a dynamic SRS resource allocation to the wireless device.

Claims

1. A method for wireless communication, comprising:

determining whether a wireless device desires dynamic sounding reference signal (SRS) resources; and

providing, based on the determination, a dynamic SRS resource allocation to the wireless device.

2. The method of claim 1, wherein the determining includes receiving a request for the dynamic SRS resources from the wireless device.

3. The method of claim 1, wherein the providing includes signaling the dynamic SRS resource allocation in a portion of an uplink or downlink scheduling grant.

4. The method of claim 1, wherein the providing includes signaling the dynamic SRS resource allocation along with a group of dynamic SRS resource allocations over a physical downlink control channel.

5. The method of claim 1, further comprising dynamically allocating semi-persistent SRS resources to the wireless device.

6. The method of claim 1, wherein the determining includes estimating an operational parameter for a communication channel with the wireless device.

7. The method of claim 6, wherein the operational parameter includes one of a traffic activity and an error rate for the communication channel with the wireless device.

8. The method of claim 1, further comprising configuring, semi-statically, a resource set for the dynamic SRS resource allocation for the wireless device.

9. The method of claim 8, wherein the resource set comprises orthogonal SRS resources.

10. The method of claim 9, wherein the dynamic SRS resource allocation is made using the resources from the resource set.

11. A wireless communication apparatus, comprising:

a memory configured to store instructions to;

determine whether a wireless device desires dynamic sounding reference signal (SRS) resources; and

provide, based on the determination, a dynamic SRS resource allocation to the wireless device; and

a processor configured to execute the instructions from the memory.

12. The wireless communications apparatus of claim 11, wherein the memory further stores instructions to receive a request for the dynamic SRS resources from the wireless device.

13. The wireless communication apparatus of claim 11, wherein the memory further stores instructions to estimate an operational parameter for a communication channel with the wireless device.

14. An apparatus for wireless communication, comprising:

means for determining whether a wireless device desires dynamic sounding reference signal (SRS) resources; and

means for providing, based on the determination, a dynamic SRS resource allocation to the wireless device.

15. A computer program product, comprising:

a tangible computer-readable medium, comprising;

code for causing at least one computer to determine whether a wireless device desires dynamic sounding reference signal (SRS) resources; and

code for causing the at least one computer to provide, based on the determination, a dynamic SRS resource allocation to the wireless device.

16. A method for wireless communication, comprising:

receiving a dynamic sounding reference signal (SRS) resource allocation; and

transmitting SRS according to the dynamic SRS resource allocation.

17. The method of claim 16, further comprising:

determining whether dynamic SRS resources are needed; and

requesting, based on the determination, the dynamic SRS resources.

18. A wireless communication apparatus, comprising:

a memory configured to store instructions to;

receive a dynamic sounding reference signal (SRS) resource allocation; and

transmit SRS according to the dynamic SRS resource allocation; and

a processor configured to execute the instructions from the memory.

19. A wireless communication apparatus, comprising:

means for receiving a dynamic sounding reference signal (SRS) resource allocation; and

means for transmitting SRS according to the dynamic SRS resource allocation.

20. A computer program product, comprising:

a tangible computer-readable medium, comprising;

code for causing at least one computer to receive a dynamic sounding reference signal (SRS) resource allocation; and

code for causing the at least one computer to transmit SRS according to the receiving dynamic SRS resource allocation.

21. A method for wireless communication, comprising:

configuring a plurality of common sounding reference signal (SRS) subframes shared with one or more cooperating cells; and

providing an SRS configuration parameter to a wireless device to facilitate an orthogonal SRS transmission over at least one of the plurality of common SRS subframes.

22. The method of claim 21, wherein the providing includes allocating a frequency comb to the wireless device that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes.

23. The method of claim 21, wherein the providing includes allocating a portion of bandwidth in at least one of the plurality of common SRS subframes to the wireless device that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes.

24. The method of claim 21, wherein the providing includes providing a configuration index to the wireless device that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes.

25. The method of claim 21, wherein the providing includes providing a cyclic shift to the wireless device for transmitting SRSs that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes.

26. A wireless communications apparatus, comprising:

a memory storing instructions to;

configure a plurality of common sounding reference signal (SRS) subframes along with one or more cooperating cells; and

provide an SRS configuration parameter to a wireless device to facilitate orthogonal SRS transmission over at least one of the plurality of common SRS subframes; and

a processor configured to execute the instructions from the memory.

27. A wireless communication apparatus, comprising:

means for configuring a plurality of common sounding reference signal (SRS) subframes shared with one or more cooperating cells; and

means for providing an SRS configuration parameter to a wireless device to facilitate an orthogonal SRS transmission over at least one of the plurality of common SRS subframes.

28. The wireless communication apparatus of claim 27, wherein the means for providing include one of:

means for allocating a frequency comb to the wireless device that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes;

means for allocating a portion of bandwidth in at least one of the plurality of common SRS subframes to the wireless device that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes;

means for providing a configuration index to the wireless device that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes; and

means for providing a cyclic shift to the wireless device for transmitting SRSs that facilitates orthogonality between SRS transmissions from the wireless device and SRS transmissions from a plurality of disparate wireless devices over the plurality of common SRS subframes.

29. A computer program product, comprising:

a tangible computer-readable medium, comprising;

code for causing at least one computer to configure a plurality of common sounding reference signal (SRS) subframes along with one or more cooperating cells; and

code for causing the at least one computer to provide an SRS configuration parameter to a wireless device to facilitate orthogonal SRS transmission over at least one of the plurality of common SRS subframes.

30. A method for wireless communication, comprising:

receiving a sounding reference signal (SRS) configuration parameter; and

performing, based on the SRS configuration parameter, an SRS transmission.

31. The method of claim 30, wherein the receiving includes receiving one of a frequency comb, a configuration index and a cyclic shift value.

32. A wireless communication apparatus, comprising:

means for receiving a sounding reference signal (SRS) configuration parameter; and

means for performing, based on the SRS configuration parameter, an SRS transmission.

33. The wireless communication apparatus of claim 32, wherein SRS configuration parameter includes one of a frequency comb, a configuration index and a cyclic shift value.

34. A computer program product, comprising:

a tangible computer-readable medium comprising;

code for receiving a sounding reference signal (SRS) configuration parameter; and

code for performing, based on the received SRS configuration parameter, an SRS transmission.

35. A wireless communication method, comprising:

determining a cell-specific SRS frequency hopping pattern over SRS resources for a wireless device; and

assigning the cell-specific SRS frequency hopping pattern to the wireless device to mitigate collisions with SRS transmissions from other wireless devices.

36. The method of claim 35, wherein the determining the cell-specific SRS frequency hopping pattern includes computing the cell-specific SRS frequency hopping pattern as a function of a physical cell identifier of a cell.

37. The method of claim 35, wherein the determining the cell-specific SRS frequency hopping pattern includes shifting one or more variables involved in the computing the cell-specific SRS frequency hopping pattern in time.

38. The method of claim 35, wherein the determining the cell-specific SRS frequency hopping pattern includes selecting one or more SRS frequency hopping patterns from a plurality of SRS frequency hopping patterns according to a physical cell identifier of a cell.

39. The method of claim 38, further comprising allowing a starting physical resource block index that determines the SRS frequency hopping pattern to hop over time.

40. A wireless communications apparatus, comprising:

a memory for storing instructions to;

determine a cell-specific sounding reference signal (SRS) frequency hopping pattern over SRS resources for a wireless device; and

assign the cell-specific SRS frequency hopping pattern to the wireless device to mitigate SRS collision with a disparate wireless device; and

a processor for executing the instructions from the memory.

41. An apparatus for wireless communication, comprising:

means for determining a cell-specific sounding reference signal (SRS) frequency hopping pattern over SRS resources for a wireless device; and

means for assigning the cell-specific SRS frequency hopping pattern to the wireless device to mitigate SRS collision with a disparate wireless device.

42. The apparatus of claim 41, wherein the means for determining include one of:

means for computing the cell-specific SRS frequency hopping pattern as a function of a physical cell identifier of a cell;

means for shifting one or more variables involved in the computing the cell-specific SRS frequency hopping pattern in time; and

means for selecting one or more SRS frequency hopping patterns from a plurality of SRS frequency hopping patterns according to a physical cell identifier of a cell.

43. A computer program product, comprising:

a tangible computer-readable medium, comprising;

code for causing at least one computer to determine a cell-specific sounding reference signal (SRS) frequency hopping pattern over SRS resources for a wireless device; and

code for causing the at least one computer to assign the cell-specific SRS frequency hopping pattern to the wireless device to mitigate SRS collision with a disparate wireless device.

44. A wireless communication method, comprising:

receiving a cell-specific sounding reference signal (SRS) frequency hopping pattern at a wireless device;

determining SRS transmission resources based on the hopping pattern; and

performing an SRS transmission according to the SRS transmission resources.

45. The method of claim 44, wherein the determining includes determining SRS transmission resources using a physical cell identifier of a cell in which the wireless device is operating.

46. The method of claim 44, wherein the determining includes determining SRS transmission resources by cyclically shifting the hopping pattern.

47. The method of claim 44, wherein the determining includes determining transmission resources based on a frequency domain position indicated in the hopping pattern.

48. A wireless communications apparatus, comprising:

a memory for storing instructions to;

receive a cell-specific sounding reference signal (SRS) frequency hopping pattern at a wireless device;

determine SRS transmission resources based on the hopping pattern; and

perform an SRS transmission according to the SRS transmission resources; and

a processor to execute the instructions from the memory.

49. An apparatus for wireless communication, comprising:

means for receiving a cell-specific sounding reference signal (SRS) frequency hopping pattern at a wireless device;

means for determining SRS transmission resources based on the hopping pattern; and

means for performing an SRS transmission according to the determined SRS transmission resources.

50. A computer program product, comprising:

a tangible computer-readable medium, comprising;

code for causing at least one computer to receive a cell-specific sounding reference signal (SRS) frequency hopping pattern at a wireless device;

code for causing the at least one computer to determine SRS transmission resources based on the hopping pattern; and

code for causing the at least one computer to perform an SRS transmission according to the SRS transmission resources.