CSI-RS antenna ports extension and 3D codebook design
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.
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 wireless network to a wireless terminal device Channel State Information (CSI) configuration information for a plurality of Channel State Information-Reference Signal (CSI-RS) ports at the eNB, 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, and 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; and
receiving at the eNB from the wireless terminal device CSI-RS information as feedback; and
selecting at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement.
9. The information-handling system according to claim 8 , 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.
10. The method according to claim 8 , 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.
11. The method according to claim 8 , 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.
12. The method according to claim 11 , 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.
13. The method according to claim 11 , 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.
14. An information-handling system, comprising:
a receiver capable of receiving a 3 rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) signal containing 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;
a processor coupled to the receiver, the processor being configured to
measure 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
send 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.
15. The information-handling system according to claim 14 , 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.
16. The information-handling system according to claim 14 , 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.
17. The information-handling system according to claim 14 , wherein the information-handling system comprises a cellular telephone, smartphone, smart-type device, or tablet-type device.
18. The information-handling system according to claim 17 , wherein the cellular telephone, smartphone, smart-type device, or tablet-type device further comprises a touchscreen display capable of receiving input information from a touch of a user or a stylus.
19. An information-handling system, comprising:
a transmitter capable of transmitting a 3 rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) signal containing 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, and 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;
a receiver capable of receiving CSI-RS information as feedback; and
a processor coupled to the receiver configured to select at least one vertical precoding vector for configuring the CSI-RS ports of the 3D antenna arrangement.
20. The information-handling system according to claim 19 , 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.
21. The information-handling system according to claim 19 , 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.
22. The information-handling system according to claim 19 , 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.
23. The information-handling system according to claim 22 , 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.
24. The information-handling system according to claim 22 , 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.