CSI-RS antenna ports extension and 3D codebook design

Patent metadata

Field	Value
Publication number	US-9438451-B2
Application number	US-201314128338-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Sep 27, 2013
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A system and a method is disclosed for selecting at least one vertical precoding vector of a three-dimensional Multiple Input Multiple Output (3D-MIMO) configuration based on Channel State Information-Reference Signal (CSI-RS) information that is feedback from a wireless terminal device to an evolved Node B (eNB). The 3D-MIMO CSI-RS process is configured for a plurality of CSI-RS ports in which the plurality of CSI-RS ports that are grouped into a plurality of CSI-RS port groups and in which corresponds to the 3D arrangement of antennas. CSI configuration information for the different CSI-RS port groups can be a time-domain-based CSI-RS process, a frequency-domain-based CSI-RS process, a code-domain-based CSI-RS process, or a combination thereof. CSI-RS information is measured for each CSI-RS group and feedback for selection of the at least one vertical precoding vector.

First claim

The invention claimed is:

1. A method to measure Channel State Information-Reference Signal (CSI-RS) information for a three-dimensional Multiple Input Multiple Output (3D-MIMO) configuration of a 3 rd Generation Partnership Project Long Term Evolution (3GPP LTE) wireless network, the method comprising:
receiving at a wireless terminal device Channel State Information (CSI) configuration information for a plurality of CSI-RS ports, the plurality of CSI-RS ports corresponding to a 3D arrangement of antennas and being grouped into a plurality of CSI-RS port groups, wherein the plurality of CSI-RS ports comprises greater than eight CSI-RS ports, and wherein each of the plurality of CSI-RS port groups comprises a corresponding CSI process;
measuring at the wireless terminal device CSI-RS information corresponding to each respective CSI-RS group, wherein a first combination of the CSI processes is performed in a first group of physical resource blocks, and a second combination of the CSI processes performed in a second group of physical resource blocks, the second combination being different from the first combination, until CSI-RS measurements have been obtained for the greater than eight CSI-RS ports; and
sending from the wireless terminal device the CSI-RS information as feedback for selecting at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement.

2. The information-handling system according to claim 1 , wherein the CSI configuration information comprises configuration information for a time-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured with a different time offset from other CSI-RS groups, a frequency-domain-based CSI-RS process in which the measured CSI-RS information for each respective CSI-RS group is measured in different Physical Resource Blocks (PRBs) that have been interlaced in the frequency domain, a code-domain-based CSI-RS process, or a combination thereof.

3. The method according to claim 1 , wherein the CSI configuration information comprises configuration information for a code-domain-based CSI-RS process that is initialized specifically for the wireless terminal device.

4. The method according to claim 1 , further comprising:
receiving at an evolved Node B (eNB) of the 3GPP LTE wireless network the feedback CSI-RS information; and
selecting the at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement.

5. The method according to claim 4 , wherein the at least one selected vertical precoding vector comprises
W V =[W V 1 , W V 2 , . . . , W V r V ]

in which W V i for i=1, 2, . . . , r V comprises a N V ×1 vector, N V represents the number of antenna ports having the same index and in which r V represents the number of vertical rank in MIMO transmission.

6. The method according to claim 5 , wherein the at least one selected vertical precoding vector is selected based on a number of antenna ports comprising a same index and to correspond to horizontal precoding vectors comprising the same antenna port index.

7. The method according to claim 6 , wherein

W
V
i

=

[

1

exp
⁡

(

-
j

⁢

⁢
2
⁢

⁢
π
⁢

d
λ

⁢

cos
⁡

(

θ
i

)

)

⋮

exp
⁡

(

-
j

⁢

⁢
2
⁢

⁢
π
⁢

r
V

⁢
d

λ

⁢

cos
⁡

(

θ
i

)

)

]

,

0
<

θ
i

<
π

in which d comprises a distance between different antenna elements and λ comprises a wavelength.

8. A method to select at least one precoding vector for a three-dimensional Multiple Input Multiple Output (3D-MIMO) configuration of a 3 rd Generation Partnership Project Long Term Evolution (3GPP LTE) wireless network, the method comprising:
sending from an evolved Node B (eNB) of the 3GPP LTE

Assignees

• Intel Corp

Inventors

• Chen Xiaogang
• Zhu Yuan
• Li Qinghua
• Davydov Alexei V
• Shirani-Mehr Hooman

Classifications

• H04B7/0479

  for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI] · CPC title

• H04B7/0413 Primary

  MIMO systems · CPC title

• H04L25/03929 Primary

  with layer mapping, e.g. codeword-to layer design (for space-time coding H04L1/0618) · CPC title

• H04B7/0478

  Special codebook structures directed to feedback optimisation · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title