Codebook subset restriction signaling

Patent metadata

Field	Value
Publication number	US-10193600-B2
Application number	US-201615105648-A
Country	US
Kind code	B2
Filing date	Jan 11, 2016
Priority date	Jan 14, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

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 ).

First claim

What is claimed is:

1. 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, 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; and
sending the generated signaling from the network node to the wireless communication device.

2. The method of claim 1 , wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

3. The method of claim 1 , wherein the certain component comprises a beam precoder.

4. The method of claim 3 , wherein a beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

5. The method of claim 4 , wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

6. The method of claim 3 , wherein the beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission; and wherein different scaled versions of that beamforming vector are transmitted on different polarizations.

7. The method of claim 3 , wherein the 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.

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

9. The method of claim 8 , wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

10. The method of claim 8 , wherein the certain component comprises a beam precoder.

11. The method of claim 10 , wherein the beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

12. The method of claim 11 , wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

13. The method of claim 10 , wherein the beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission; and wherein different scaled versions of that beamforming vector are transmitted on different polarizations.

14. The method of claim 8 , 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.

15. 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, 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; and
send the generated signaling from the network node to the wireless communication device.

16. The network node of claim 15 , wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

17. The network node of claim 15 , wherein the certain component comprises a beam precoder.

18. The network node of claim 17 , wherein the beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

19. The network node of claim 18 , wherein the different beamforming vectors comprise Discrete Fourier Transform (DFT) vectors.

20. The network node of claim 17 , wherein the beam precoder is a beamforming vector used to transmit on a particular layer of a multi-layer transmission; and wherein different scaled versions of that beamforming vector are transmitted on different polarizations.

21. The network node of claim 17 , wherein the 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.

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

23. The wireless communication device of claim 22 , wherein a precoder comprising one or more beam precoders is restricted if at least one of its one or more beam precoders is restricted.

24. The wireless communication device of claim 22 , wherein the certain component comprises a beam precoder.

25. The wireless communication device of claim 24 , wherein the beam precoder is a Kronecker product of different beamforming vectors associated with different dimensions of a multi-dimensional antenna array.

26. The wireless commu

Assignees

• Ericsson Telefon Ab L M

Inventors

• Faxér Sebastian
• Frenne Mattias
• Järmyr Simon
• Jöngren George
• Wernersson Niklas

Classifications

• H04B7/0658

  Feedback reduction · CPC title

• H03M7/3082

  Vector coding (for television signals, see H04N19/94) · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H03M7/3068 Primary

  Precoding preceding compression, e.g. Burrows-Wheeler transformation · CPC title

• H04B7/0469 Primary

  taking special antenna structures, e.g. cross polarized antennas into account · CPC title