Codebook Subset Restriction Signaling

• US 20180131420A1
• Filed: 01/11/2016
• Published: 05/10/2018
• Est. Priority Date: 01/14/2015
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Faxr, Sebastian, Frenne, Mattias, Jrmyr, Simon, Jngren, George, Wernersson, Niklas
• Granted Patent: US 10,193,600 B2
• Time in Patent Office: Days
• CPC Class Codes: H03M 7/3068 Precoding preceding compression, e.g. Burrows-Wheeler transformation
• CPC Class Codes: H03M 7/3082 Vector coding for television signals, see H04N19/94
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• 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 7/0658 Feedback reduction

Abstract

A network node (10) signals to a wireless communication device (14) which precoders in a codebook are restricted from being used. The network node (10) in this regard generates codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component (e.g., a certain beam precoder) that the precoders in the group have in common. This signaling may be for instance rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders'"'"' transmission rank. Regardless, the network node (10) sends the generated signaling to the wireless communication device (14).

Claims

1-38. -38. (canceled)

39. A method implemented by a network node for signaling to a wireless communication device which precoders in a codebook are restricted from being used, the method characterized by:

generating codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component that the precoders in the group have in common; and

sending the generated signaling from the network node to the wireless communication device.

40. The method of claim 39, wherein the codebook subset restriction signaling is rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders'"'"' transmission rank.

41. The method of claim 39, wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

42. The method of claim 39, wherein the certain component comprises a beam precoder.

43. The method of claim 42, wherein a beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

44. The method of claim 43, wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

45. The method of claim 42, wherein a beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission, wherein different scaled versions of that beamforming vector are transmitted on different polarizations;

46. The method of claim 39, wherein a beam precoder is a Kronecker product of first and second beamforming vectors with first and second indices, wherein the first and second beamforming vectors are associated with different dimensions of a multi-dimensional antenna array, and wherein the codebook subset restriction signaling jointly restricts the precoders in a group of precoders that have the same pair of values for the first and second indices.

47. A method implemented by a wireless communication device for decoding signaling from a network node indicating which precoders in a codebook are restricted from being used, the method characterized by:

receiving codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component that the precoders in the group have in common; and

decoding the received signaling as jointly restricting precoders in each of the one or more groups of precoders.

48. The method of claim 47, wherein the codebook subset restriction signaling is rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders'"'"' transmission rank.

49. The method of claim 47, wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

50. The method of claim 47, wherein the certain component comprises a beam precoder.

51. The method of claim 50, wherein a beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

52. The method of claim 51, wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

53. The method of claim 50, wherein a beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission, wherein different scaled versions of that beamforming vector are transmitted on different polarizations;

54. The method of claim 47, wherein a beam precoder is a Kronecker product of first and second beamforming vectors with first and second indices, wherein the first and second beamforming vectors are associated with different dimensions of a multi-dimensional antenna array, and wherein the codebook subset restriction signaling jointly restricts the precoders in a group of precoders that have the same pair of values for the first and second indices.

55. A network node for signaling to a wireless communication device which precoders in a codebook are restricted from being used, the network node comprising:

a processor and a memory, the memory containing instructions executable by the processor whereby the network node is configured to;

generate codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component that the precoders in the group have in common; and

send the generated signaling from the network node to the wireless communication device.

56. The network node of claim 55, wherein the codebook subset restriction signaling is rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders'"'"' transmission rank.

57. The network node of claim 55, wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

58. The network node of claim 55, wherein the certain component comprises a beam precoder.

59. The network node of claim 58, wherein a beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

60. The network node of claim 59, wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

61. The network node of claim 58, wherein a beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission, wherein different scaled versions of that beamforming vector are transmitted on different polarizations;

62. The network node of claim 55, wherein a beam precoder is a Kronecker product of first and second beamforming vectors with first and second indices, wherein the first and second beamforming vectors are associated with different dimensions of a multi-dimensional antenna array, and wherein the codebook subset restriction signaling jointly restricts the precoders in a group of precoders that have the same pair of values for the first and second indices.

63. A wireless communication device for decoding signaling from a network node indicating which precoders in a codebook are restricted from being used, the wireless communication device comprising:

a processor and a memory, the memory containing instructions executable by the processor whereby the wireless communication device is configured to;

receive codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component that the precoders in the group have in common; and

decode the received signaling as jointly restricting precoders in each of the one or more groups of precoders.

64. The wireless communication device of claim 63, wherein the codebook subset restriction signaling is rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders'"'"' transmission rank.

65. The wireless communication device of claim 63, wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

66. The wireless communication device of claim 63, wherein the certain component comprises a beam precoder.

67. The wireless communication device of claim 66, wherein a beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

68. The wireless communication device of claim 67, wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

69. The wireless communication device of claim 66, wherein a beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission, wherein different scaled versions of that beamforming vector are transmitted on different polarizations;

70. The wireless communication device of claim 63, wherein a beam precoder is a Kronecker product of first and second beamforming vectors with first and second indices, wherein the first and second beamforming vectors are associated with different dimensions of a multi-dimensional antenna array, and wherein the codebook subset restriction signaling jointly restricts the precoders in a group of precoders that have the same pair of values for the first and second indices.