Channel state information measurement method and device, and signal transmission method and device
View Patent ↗The present disclosure provides a CSI measurement method and a CSI measurement device. The CSI measurement method includes steps of: receiving channel state measurement information from a network side, the channel state measurement information including a CRS from a set of CRS ports corresponding to vertical beams having an identical V shift in a vertical dimension, the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and performing CSI measurement in accordance with the channel state measurement information. According to the embodiments of the present disclosure, the CSI measurement is performed in accordance with the CRS of the set of CRS ports corresponding to the vertical beams having an identical V shift in the vertical dimension, so that a common signal/channel in the vertical dimension is covered by several vertical beams. Each vertical beam has a small main lobe width, so a constant modulus weight vector may be used. As a result, it is able to improve the power efficiency.
1. A Channel State Information (CSI) measurement method, comprising steps of:
receiving channel state measurement information from a network side, the channel state measurement information comprising a Cell-specific Reference Signal (CRS) from a set of CRS ports corresponding to vertical beams having an identical V shift in a vertical dimension, wherein the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension, in a frequency domain; and
performing CSI measurement in accordance with the channel state measurement information,
wherein in the case that a signal a k,l (p) is transmitted via a CRS port p (port number) over a sub-carrier k (sub-carrier index) and an OFDM symbol l (symbol number), a relationship among p, k, l and V shift is shown as follows:
k
=
6
m
+
(
v
+
v
shift
)
mod
6
l
=
{
0
,
N
symb
DL
-
3
if
p
∈
{
0
,
1
}
1
if
p
∈
{
2
,
3
}
,
m
=
0
,
1
,
…
,
2
·
N
RB
DL
-
1
wherein V shift =0, . . . 5, N symb DL represents the number of the OFDM symbols in each time slot, and N RB DL represents the number of downlink Resource Blocks (RBs).
2. The CSI measurement method according to claim 1 , wherein in the case that there is only one CRS port corresponding to the vertical beams having the identical V shift , the CRS is transmitted over a Physical Broadcast Channel (PBCH) in a single-port via the CRS port corresponding to all the vertical beams;
in the case that there are two CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PBCH in a Space Frequency Block Code (SFBC) via the set of CRS ports corresponding to the vertical beams having the identical V shift ; and
in the case that there are four CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PBCH both in an SFBC and a Frequency Switched Transmit Diversity (FSTD) via the set of CRS ports corresponding to the vertical beams having the identical V shift .
3. The CSI measurement method according to claim 1 , wherein the step of performing the CSI measurement in accordance with the channel state measurement information comprises performing measurement on channels on a set of CRS ports corresponding to each V shift , so as to determine CSI.
4. The CSI measurement method according to claim 3 , wherein the step of performing the CSI measurement in accordance with the channel state measurement information further comprises reporting the determined CSI corresponding to all the vertical beams, or reporting the determined CSI corresponding to parts of the vertical beams and serial numbers of the parts of the vertical beams.
5. The CSI measurement method according to claim 1 , wherein the CSI comprises at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI).
6. A Channel State Information (CSI) measurement device, comprising:
a reception module configured to receive channel state measurement information from a network side, the channel state measurement information comprising a Cell-specific Reference Signal (CRS) from a set of CRS ports corresponding to vertical beams having an identical V shift in a vertical dimension, wherein the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and
a measurement module configured to perform CSI measurement in accordance with the channel state measurement information,
wherein in the case that a signal a k,l (p) is transmitted via a CRS port p (port number) over a sub-carrier k (sub-carrier index) and an OFDM symbol l (symbol number), a relationship among p, k, l and V shift is shown as follows:
k
=
6
m
+
(
v
+
v
shift
)
mod
6
l
=
{
0
,
N
symb
DL
-
3
if
p
∈
{
0
,
1
}
1
if
p
∈
{
2
,
3
}
,
m
=
0
,
1
,
…
,
2
·
N
RB
DL
-
1
wherein V shift =0, . . . , 5, N symb DL represents the number of the OFDM symbols in each time slot, and N RB DL represents the number of downlink Resource Blocks (RBs).
7. The CSI measurement device according to claim 6 , wherein in the case that there is only one CRS port corresponding to the vertical beams having the identical V shift , the CRS is transmitted over a Physical Broadcast Channel (PBCH) in a single-port via the CRS port corresponding to all the vertical beams;
in the case that there are two CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PBCH in a Space Frequency Block Code (SFBC) via the set of CRS ports corresponding to the vertical beams having the identical V shift ; and
in the case that there are four CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PBCH both in an SFBC and a Frequency Switched Transmit Diversity (FSTD) via the set of CRS ports corresponding to the vertical beams having the identical V shift .
8. The CSI measurement device according to claim 6 , wherein the measurement module is configured to perform measurement on channels on a set of CRS ports corresponding to each V shift , so as to determine CSI.
9. The CSI measurement device according to claim 8 , wherein the measurement module is further configured to report the determined CSI corresponding to all the vertical beams, or report the determined CSI corresponding to parts of the vertical beams and serial numbers of the parts of the vertical beams.
10. The CSI measurement device according to claim 6 , wherein the CSI comprises at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI).
11. A signal transmission method, comprising steps of:
determining Cell-specific Reference Signal (CRS) ports of vertical beams in a vertical dimension, and determining a V shift of the vertical beam corresponding to each CRS port in the vertical dimension, wherein the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and
transmitting CRS via the CRS port in accordance with the V shift ,
wherein in the case that a signal a k,l (p) is transmitted via a CRS port p (port number) over a sub-carrier k (sub-carrier index) and an OFDM symbol l (symbol number), a relationship among p, k, l and V shift is shown as follows:
k
=
6
m
+
(
v
+
v
shift
)
mod
6
l
=
{
0
,
N
symb
DL
-
3
if
p
∈
{
0
,
1
}
1
if
p
∈
{
2
,
3
}
,
m
=
0
,
1
,
…
,
2
·
N
RB
DL
-
1
wherein V shift =0, . . . , 5, N symb DL represents the number of the OFDM symbols in each time slot, and N RB DL represents the number of downlink Resource Blocks (RBs).
12. The signal transmission method according to claim 11 ,
wherein in the case that there is only one CRS port corresponding to the vertical beams having the identical V shift , the CRS is transmitted over a Physical Downlink Control Channel (PDCCH) in a single-port via the CRS port corresponding to all the vertical beams;
in the case that there are two CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PDCCH in a Space Frequency Block Code (SFBC) via the set of CRS ports corresponding to the vertical beams having the identical V shift ; and
in the case that there are four CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PDCCH both in an SFBC and a Frequency Switched Transmit Diversity (FSTD) via the set of CRS ports corresponding to the vertical beams having the identical V shift .
13. The CSI measurement method according to claim 11 , wherein the CSI comprises at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI).
14. A signal transmission device, comprising:
a determination module configured to determine CRS ports of vertical beams in a vertical dimension, and determine a V shift of the vertical beam corresponding to each CRS port in the vertical dimension, wherein the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and
a transmission module configured to transmit CRS via the CRS port in accordance with the V shift ,
wherein in the case that a signal a k,l (p) is transmitted via a CRS port p (port number) over a sub-carrier k (sub-carrier index) and an OFDM symbol l (symbol number), a relationship among p, k, l and V shift is shown as follows:
k
=
6
m
+
(
v
+
v
shift
)
mod
6
l
=
{
0
,
N
symb
DL
-
3
if
p
∈
{
0
,
1
}
1
if
p
∈
{
2
,
3
}
,
m
=
0
,
1
,
…
,
2
·
N
RB
DL
-
1
wherein V shift =0, . . . , 5, N symb DL represents the number of the OFDM symbols in each time slot, and N RB DL represents the number of downlink Resource Blocks (RBs).
15. The signal transmission device according to claim 14 , wherein in the case that there is only one CRS port corresponding to the vertical beams having the identical V shift , the CRS is transmitted over a Physical Downlink Control Channel (PDCCH) in a single-port via the CRS port corresponding to all the vertical beams;
in the case that there are two CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PDCCH in a Space Frequency Block Code (SFBC) via the set of CRS ports corresponding to the vertical beams having the identical V shift ; and
in the case that there are four CRS ports corresponding to the vertical beams having the identical V shift , the CRS is transmitted over the PDCCH both in an SFBC and a Frequency Switched Transmit Diversity (FSTD) via the set of CRS ports corresponding to the vertical beams having the identical V shift .
16. The CSI measurement method according to claim 14 , wherein the CSI comprises at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI).
17. A signal transmission method, comprising steps of:
receiving a Cell-specific Reference Signal (CRS) from a network side;
determining a CRS port corresponding to a Physical Downlink Shared Channel (PDSCH), and determining a V shift of a vertical beam corresponding to the CRS port in a vertical dimension, wherein the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and
performing channel estimation using CRS in accordance with the V shift , and performing data demodulation,
wherein in the case that a signal a k,l (p) is transmitted via a CRS port p (port number) over a sub-carrier k (sub-carrier index) and an OFDM symbol l (symbol number), a relationship among p, k, l and V shift is shown as follows:
k
=
6
m
+
(
v
+
v
shift
)
mod
6
l
=
{
0
,
N
symb
DL
-
3
if
p
∈
{
0
,
1
}
1
if
p
∈
{
2
,
3
}
,
m
=
0
,
1
,
…
,
2
·
N
RB
DL
-
1
wherein V shift =0, . . . , 5, N symb DL represents the number of the OFDM symbols in each time slot, and N RB DL represents the number of downlink Resource Blocks (RBs).
18. The CSI measurement method according to claim 17 , wherein the CSI comprises at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI).
19. A signal transmission device, comprising:
a reception module configured to receive a Cell-specific Reference Signal (CRS) from a network side;
a determination module configured to determine a CRS port corresponding to a Physical Downlink Shared Channel (PDSCH), and determine a V shift of a vertical beam corresponding to the CRS port in a vertical dimension, wherein the V shift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and
a processing module configured to perform channel estimation using CRS in accordance with the V shift parameter, and perform data demodulation,
wherein in the case that a signal a k,l (p) is transmitted via a CRS port p (port number) over a sub-carrier k (sub-carrier index) and an OFDM symbol l (symbol number), a relationship among p, k, l and V shift is shown as follows:
k
=
6
m
+
(
v
+
v
shift
)
mod
6
l
=
{
0
,
N
symb
DL
-
3
if
p
∈
{
0
,
1
}
1
if
p
∈
{
2
,
3
}
,
m
=
0
,
1
,
…
,
2
·
N
RB
DL
-
1
wherein V shift =0, . . . , 5, N symb DL represents the number of the OFDM symbols in each time slot, and N RB DL represents the number of downlink Resource Blocks (RBs).
20. The CSI measurement device according to claim 19 , wherein the CSI comprises at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI).