DM-RS BASED DECODING USING CSI-RS-BASED TIMING

• US 20130182799A1
• Filed: 01/10/2013
• Published: 07/18/2013
• Est. Priority Date: 01/13/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Geirhofer, Stefan, Chen, Wanshi, Luo, Tao, Gaal, Peter, Xu, Hao
• Granted Patent: US 9,374,253 B2
• Time in Patent Office: Days
• US Class Current: 375/340
• CPC Class Codes: H04L 27/00 Modulated-carrier systems
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

Certain aspects of the present disclosure relate to a method of wireless communication that includes receiving one or more channel state information reference signal (CSI-RS) resources. The method further includes performing timing estimation based on the one or more CSI-RS resources, receiving a demodulation reference signal (DM-RS) based transmission, and utilizing the timing estimation to decode the DM-RS based transmission.

Claims

1. A method for wireless communications by a UE, comprising:

receiving one or more channel state information reference signal (CSI-RS) resources;

performing timing estimation based on the one or more CSI-RS resources;

receiving a demodulation reference signal (DM-RS) based transmission; and

utilizing the timing estimation to decode the DM-RS based transmission.

2. The method of claim 1, further comprising determining which CSI-RS resources to use for performing the timing estimation.

3. The method of claim 2, wherein the determination is based, at least in part, on signaling received from a network.

4. The method of claim 3, wherein the signaling received from the network comprises a combination of:

semi-static signaling from the network indicating one or more configuration states, wherein each configuration state is associated with one CSI-RS resource; and

dynamic signaling indicating which of the one or more configuration states should be utilized for performing the timing estimation.

5. The method of claim 3, wherein the signaling indicates CSI-RS resources to be used for performing the timing estimation via at least one bit included in a grant associated with the DM-RS based transmission.

6. The method of claim 3, wherein the determination is based, at least in part, on the type of grant associated with the DM-RS based transmission.

7. The method of claim 3, wherein the signaling indicates CSI-RS resources to be used for performing the timing estimation via a scrambling code identity (SCID) bit in the grant.

8. The method of claim 3, wherein:

the signaling is provided in a first subframe; and

the DM-RS based transmission is transmitted in a second subframe subsequent to the first subframe.

9. The method of claim 3, wherein the CSI-RS resource to be used for timing estimation is selected as the one for which an aperiodic feedback report has been reported or requested most recently.

10. The method of claim 3, wherein the determination is based on a virtual cell ID.

11. The method of claim 2, wherein the determination is dependent, at least in part, on a type of subframe.

12. The method of claim 11, wherein:

the CSI-RS resources used for timing estimation are dependent, at least in part, on whether a subframe containing the CSI-RS is subject to reduced interference by other transmission points.

13. The method of claim 1, wherein the DM-RS based transmission comprises a data transmission.

14. The method of claim 1, wherein the DM-RS based transmission comprises control information.

15. The method of claim 14, wherein the DM-RS based transmission comprises an enhanced physical downlink control channel (EPDCCH).

16. The method of claim 15, wherein:

the EPDCCH comprises multiple decoding sets; and

the determination of the CSI-RS resource associated with the DM-RS based transmission depends, at least in part, on signaling received by the network that associates each of the decoding sets with a CSI-RS resource.

17. A method for wireless communications by a base station (BS), comprising:

transmitting signaling that indicates, to a user equipment (UE) a set of one or more channel state information reference signal (CSI-RS) resources to be used for performing timing estimation; and

sending a demodulation reference signal (DM-RS) based transmission to the UE, the DM-RS transmission to be decoded by the UE, based on the timing estimation performed using the indicated CSI-RS resources.

18. The method of claim 17, wherein the signaling comprises a combination of:

semi-static signaling indicating one or more configuration states, wherein each configuration state is associated with one CSI-RS resource; and

dynamic signaling indicating which of the one or more configuration states should be utilized for performing the timing estimation.

19. The method of claim 17, wherein the signaling indicates CSI-RS resources to be used for performing the timing estimation via at least one bit included in a grant associated with the DM-RS based transmission.

20. The method of claim 19, wherein the indication is based, at least in part, on the type of grant associated with the DM-RS based transmission.

21. The method of claim 17, wherein the signaling indicates CSI-RS resources to be used for performing the timing estimation via a scrambling code identity (SCID) bit in the grant.

22. The method of claim 17, wherein:

the signaling is provided in a first subframe; and

the DM-RS based transmission is transmitted in a second subframe subsequent to the first subframe.

23. The method of claim 17, wherein the CSI-RS resource to be used for timing estimation is selected as the one for which an aperiodic feedback report has been reported or requested most recently.

24. The method of claim 17, wherein the determination is based on a virtual cell ID.

25. The method of claim 17, wherein the CSI-RS resources to be used depend, at least in part, on a type of subframe.

26. The method of claim 25, wherein:

the CSI-RS resources used for timing estimation are dependent, at least in part, on whether a subframe containing the CSI-RS is subject to reduced interference by other transmission points.

27. The method of claim 17, wherein the DM-RS based transmission comprises a data transmission.

28. The method of claim 17, wherein the DM-RS based transmission comprises control information.

29. The method of claim 28, wherein the DM-RS based transmission comprises an enhanced physical downlink control channel (EPDCCH).

30. The method of claim 29, wherein:

the EPDCCH comprises multiple decoding sets; and

the signaling associates each of the decoding sets with a CSI-RS resource.

31. An apparatus for wireless communications, comprising:

means for receiving one or more channel state information reference signal (CSI-RS) resources;

means for performing timing estimation based on the one or more CSI-RS resources;

means for receiving a demodulation reference signal (DM-RS) based transmission; and

means for utilizing the timing estimation to decode the DM-RS based transmission.

32. The apparatus of claim 31, further comprising means for determining which CSI-RS resources to use for performing the timing estimation.

33. The apparatus of claim 32, wherein the determination is based, at least in part, on signaling received from a network.

34. The apparatus of claim 33, wherein the means for signaling received from the network comprises a combination of:

means for semi-static signaling from the network indicating one or more configuration states, wherein each configuration state is associated with one CSI-RS resource; and

means for dynamic signaling indicating which of the one or more configuration states should be utilized for performing the timing estimation.

35. The apparatus of claim 33, wherein the means for signaling indicates CSI-RS resources to be used for performing the timing estimation via at least one bit included in a grant associated with the DM-RS based transmission.

36. The apparatus of claim 33, wherein the determination is based, at least in part, on the type of grant associated with the DM-RS based transmission.

37. The apparatus of claim 33, wherein the means for signaling indicates CSI-RS resources to be used for performing the timing estimation via a scrambling code identity (SCID) bit in the grant.

38. The apparatus of claim 33, wherein:

the means for signaling is provided in a first subframe; and

the DM-RS based transmission is transmitted in a second subframe subsequent to the first subframe.

39. The apparatus of claim 33, wherein the CSI-RS resource to be used for timing estimation is selected as the one for which an aperiodic feedback report has been reported or requested most recently.

40. The apparatus of claim 33, wherein the determination is based on a virtual cell ID.

41. The apparatus of claim 32, wherein the determination is dependent, at least in part, on a type of subframe.

42. The apparatus of claim 41, wherein:

the CSI-RS resources used for timing estimation are dependent, at least in part, on whether a subframe containing the CSI-RS is subject to reduced interference by other transmission points.

43. The apparatus of claim 31, wherein the DM-RS based transmission comprises a data transmission.

44. The apparatus of claim 31, wherein the DM-RS based transmission comprises control information.

45. The apparatus of claim 44, wherein the DM-RS based transmission comprises an enhanced physical downlink control channel (EPDCCH).

46. The apparatus of claim 45, wherein:

the EPDCCH comprises multiple decoding sets; and

the determination of the CSI-RS resource associated with the DM-RS based transmission depends, at least in part, on signaling received by the network that associates each of the decoding sets with a CSI-RS resource.

47. An apparatus for wireless communications, comprising:

means for transmitting signaling that indicates, to a user equipment (UE) a set of one or more channel state information reference signal (CSI-RS) resources to be used for performing timing estimation; and

means for sending a demodulation reference signal (DM-RS) based transmission to the UE, the DM-RS transmission to be decoded by the UE, based on the timing estimation performed using the indicated CSI-RS resources.

48. The apparatus of claim 47, wherein the means for signaling comprises a combination of:

means for semi-static signaling indicating one or more configuration states, wherein each configuration state is associated with one CSI-RS resource; and

means for dynamic signaling indicating which of the one or more configuration states should be utilized for performing the timing estimation.

49. The apparatus of claim 47, wherein the means for signaling indicates CSI-RS resources to be used for performing the timing estimation via at least one bit included in a grant associated with the DM-RS based transmission.

50. The apparatus of claim 49, wherein the indication is based, at least in part, on the type of grant associated with the DM-RS based transmission.

51. The apparatus of claim 47, wherein the means for signaling indicates CSI-RS resources to be used for performing the timing estimation via a scrambling code identity (SCID) bit in the grant.

52. The apparatus of claim 47, wherein:

the means for signaling provides signaling in a first subframe; and

the DM-RS based transmission is transmitted in a second subframe subsequent to the first subframe.

53. The apparatus of claim 47, wherein the CSI-RS resource to be used for timing estimation is selected as the one for which an aperiodic feedback report has been reported or requested most recently.

54. The apparatus of claim 47, wherein the determination is based on a virtual cell ID.

55. The apparatus of claim 47, wherein the CSI-RS resources to be used depend, at least in part, on a type of subframe.

56. The apparatus of claim 55, wherein:

the CSI-RS resources used for timing estimation are dependent, at least in part, on whether a subframe containing the CSI-RS is subject to reduced interference by other transmission points.

57. The apparatus of claim 47, wherein the DM-RS based transmission comprises a data transmission.

58. The apparatus of claim 47, wherein the DM-RS based transmission comprises control information.

59. The apparatus of claim 58, wherein the DM-RS based transmission comprises an enhanced physical downlink control channel (EPDCCH).

60. The apparatus of claim 59, wherein:

the EPDCCH comprises multiple decoding sets; and

the means for signaling provides signaling that associates each of the decoding sets with a CSI-RS resource.

61. A user equipment, comprising:

at least one processor; and

a memory coupled to said at least one processor, wherein said at least one processor is configured to receive one or more channel state information reference signal (CSI-RS) resources, perform timing estimation based on the one or more CSI-RS resources;

receive a demodulation reference signal (DM-RS) based transmission; and

utilize the timing estimation to decode the DM-RS based transmission.

62. A base station, comprising:

at least one processor; and

a memory coupled to said at least one processor, wherein said at least one processor is configured to transmit signaling that indicates, to a user equipment (UE) a set of one or more channel state information reference signal (CSI-RS) resources to be used for performing timing estimation, and send a demodulation reference signal (DM-RS) based transmission to the UE, the DM-RS transmission to be decoded by the UE, based on the timing estimation performed using the indicated CSI-RS resources.

63. A computer program product comprising a non-transitory computer readable medium having instructions stored thereon, the instructions executable by one or more processors for:

receiving one or more channel state information reference signal (CSI-RS) resources;

performing timing estimation based on the one or more CSI-RS resources;

receiving a demodulation reference signal (DM-RS) based transmission; and

utilizing the timing estimation to decode the DM-RS based transmission.

64. A computer program product comprising a non-transitory computer readable medium having instructions stored thereon, the instructions executable by one or more processors for:

transmitting signaling that indicates, to a user equipment (UE) a set of one or more channel state information reference signal (CSI-RS) resources to be used for performing timing estimation; and

sending a demodulation reference signal (DM-RS) based transmission to the UE, the DM-RS transmission to be decoded by the UE, based on the timing estimation performed using the indicated CSI-RS resources.