Channel-state-information reference signals for advanced wireless systems
A mobile station includes a receiver configured to receive containing a complex-valued modulation symbol from a base station, a processor configured to extract the complex-valued modulation symbol from the signal, wherein in response to being configured with code-division multiplex-4 (CDM-4), the complex-valued modulation symbol is mapped using a reference signal sequence. A base station includes a processor configured to generate a reference signal sequence for each subcarrier and OFDM symbol, and in response to being configured with code-division multiplex-4 (CDM-4), map a reference signal sequence to the complex-valued modulation symbols. Other embodiments including a method for performing communication on multiple input multiple output (MIMO) radio links are also disclosed.
1. A mobile station comprising:
a receiver configured to receive a signal including a complex-valued modulation symbol a k,l (p′) from a base station;
a processor configured to extract the complex-valued modulation symbol a k,l (p′) from the signal,
wherein in response to being configured with code-division multiplex-4 (CDM-4), the complex-valued modulation symbol a k,l (p′) is mapped using a reference signal sequence r l,n s (m according to:
a k,l (p′) =w p′ ( i )· r l,n s ( m ′)
where p′ is a CSI-RS antenna port number per CSI-RS resource and w p′ (i) is a sequence to apply on resource elements, and
k
=
k
′
+
12
m
-
{
k
″
for
p
′
∈
{
15
,
16
,
19
,
20
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
k
″
+
6
for
p
′
∈
{
17
,
18
,
21
,
22
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
6
k
″
for
p
′
∈
{
15
,
16
,
17
,
18
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
4
l
=
l
′
+
{
l
″
CSI
reference
signal
configurations
0
-
19
,
normal
cyclic
prefix
2
l
″
CSI
reference
signal
configurations
20
-
31
,
normal
cyclic
prefix
l
″
=
0
,
1
k
″
=
0
,
1
for
normal
cyclic
prifix
i
=
2
k
″
+
l
″
m
=
0
,
1
,
…
,
N
RB
DL
-
1
m
′
=
m
+
⌊
N
RB
max
,
DL
-
N
RB
DL
2
⌋
,
wherein N ports CSI is a number of CSI-RS antenna ports per resource, wherein when a total number of antenna ports is 12, a number of CSI-RS antenna ports per resource, N ports CSI-RS is 4 and number of CSI-RS resources, N res CSI-RS is 3, and when the total number of CSI-RS antenna ports is 16, the number of CSI-RS antenna ports per resource, N ports CSI-RS is 8 and the number of CSI-RS resources, N res CSI-RS is 2.
2. The mobile station of claim 1 , wherein when the total number of CSI-RS antenna ports is 12, CSI-RS antenna ports p′=15, 16, 17 and 18 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
3. The mobile station of claim 1 , wherein when the total number of CSI-RS antenna ports is 16, CSI-RS antenna ports p′=15, 16, 19 and 20 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively and CSI-RS antenna ports 17, 18, 21 and 22 are assigned with OCC indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
4. The mobile station of claim 1 , wherein an antenna port number p is determined based on a number of the CSI-RS antenna port number p′, according to p=p′+iN ports CSI-RS , where p′ε{15, 16, . . . , 15+N ports CSI-RS −1}, wherein i=n−1 and nε{1, . . . , N res CSI-RS }.
5. A method comprising:
receiving a signal including a complex-valued modulation symbol a k,l (p′) from a base station; and
extracting the complex-valued modulation symbol a k,l (p′) from the signal,
wherein in response to being configured with code-division multiplex-4 (CDM-4), the complex-valued modulation symbol a k,l (p′) is mapped using a reference signal sequence r l,n s (m′) according to:
a k,l (p′) =w p′ ( i )· r l,n s ( m ′)
where p′ is a CSI-RS antenna port number per CSI-RS resource and w p′ (i) is a sequence to apply on resource elements, and
k
=
k
′
+
12
m
-
{
k
″
for
p
′
∈
{
15
,
16
,
19
,
20
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
k
″
+
6
for
p
′
∈
{
17
,
18
,
21
,
22
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
6
k
″
for
p
′
∈
{
15
,
16
,
17
,
18
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
4
l
=
l
′
+
{
l
″
CSI
reference
signal
configurations
0
-
19
,
normal
cyclic
prefix
2
l
″
CSI
reference
signal
configurations
20
-
31
,
normal
cyclic
prefix
l
″
=
0
,
1
k
″
=
0
,
1
for
normal
cyclic
prifix
i
=
2
k
″
+
l
″
m
=
0
,
1
,
…
,
N
RB
DL
-
1
m
′
=
m
+
⌊
N
RB
max
,
DL
-
N
RB
DL
2
⌋
,
wherein N ports CSI is a number of CSI-RS antenna ports per resource, wherein when a total number of antenna ports is 12, a number of CSI-RS antenna ports per resource, N ports CSI-RS is 4 and number of CSI-RS resources, N res CSI-RS is 3, and when the total number of CSI-RS antenna ports is 16, the number of CSI-RS antenna ports per resource, N ports CSI-RS is 8 and the number of CSI-RS resources, N res CSI-RS is 2.
6. The method of claim 5 , wherein when the total number of CSI-RS antenna ports is 12, CSI-RS antenna ports p′=15, 16, 17 and 18 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
7. The method of claim 5 , wherein when the total number of CSI-RS antenna ports is 16, CSI-RS antenna ports p′=15, 16, 19 and 20 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively and CSI-RS antenna ports p′=17, 18, 21 and 22 are assigned with OCC indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
8. The method of claim 5 , wherein antenna port number p is determined based on a number of CSI-RS antenna port number p′, according to p=p′+iN ports CSI-RS , where p′ε{15, 16, . . . , 15+N ports CSI-RS −1}, wherein i=n−1 and nε{1, . . . , N res CSI-RS }.
9. A base station comprising:
a processor configured to:
generate a reference signal sequence for a plurality of subcarriers and OFDM symbols; and
in response to being configured with code-division multiplex-4 (CDM-4), map a reference signal sequence r l,n s (m′) to a complex-valued modulation symbol a k,l (p′) according to:
a k,l (p′) =w p′ ( i )· r l,n s ( m ′)
where p′ is a CSI-RS antenna port number per CSI-RS resource and w p′ (i) is a sequence to apply on resource elements, and
k
=
k
′
+
12
m
-
{
k
″
for
p
′
∈
{
15
,
16
,
19
,
20
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
k
″
+
6
for
p
′
∈
{
17
,
18
,
21
,
22
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
6
k
″
for
p
′
∈
{
15
,
16
,
17
,
18
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
4
l
=
l
′
+
{
l
″
CSI
reference
signal
configurations
0
-
19
,
normal
cyclic
prefix
2
l
″
CSI
reference
signal
configurations
20
-
31
,
normal
cyclic
prefix
l
″
=
0
,
1
k
″
=
0
,
1
for
normal
cyclic
prifix
i
=
2
k
″
+
l
″
m
=
0
,
1
,
…
,
N
RB
DL
-
1
m
′
=
m
+
⌊
N
RB
max
,
DL
-
N
RB
DL
2
⌋
,
wherein N ports CSI is a number of CSI-RS antenna ports per resource, wherein when a total ports number of antenna ports is 12, a number of CSI-RS antenna ports per resource, N ports CSI-RS is 4 and number of CSI-RS resources, N res CSI-RS is 3, and when the total number of CSI-RS antenna ports is 16, the number of CSI-RS antenna ports per resource, N ports CSI-RS is 8 and the number of CSI-RS resources, N REs CSI-RS is 2.
10. The base station of claim 9 , wherein when the total number of CSI-RS antenna ports is 12, CSI-RS antenna ports p′=15, 16, 17 and 18 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
11. The base station of claim 9 , wherein when the total number of CSI-RS antenna ports is 16, CSI-RS antenna ports p′=15, 16, 19 and 20 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively and CSI-RS antenna ports p′=17, 18, 21 and 22 are assigned with OCC indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
12. The base station of claim 9 , wherein antenna port number p is determined based on a number of CSI-RS antenna port number p′, according to p=p′+iN ports CSI-RS , where p′ε{15, 16, . . . , 15+N ports CSI-RS −1}, wherein i=n−1 and nε{1, . . . , N res CSI-RS }.
13. A method comprising:
generating a reference signal sequence for a plurality of subcarriers and OFDM symbols; and
in response to being configured with code-division multiplex-4 (CDM-4), mapping a reference signal sequence r l,n s (m′) to a complex-valued modulation symbol a k,l (p′) according to:
a k,l (p′) =w p′ ( i )· r l,n s ( m ′)
where p′ is a CSI-RS antenna port number per CSI-RS resource and w p′ (i) is a sequence to apply on resource elements, and
k
=
k
′
+
12
m
-
{
k
″
for
p
′
∈
{
15
,
16
,
19
,
20
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
k
″
+
6
for
p
′
∈
{
17
,
18
,
21
,
22
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
8
6
k
″
for
p
′
∈
{
15
,
16
,
17
,
18
}
,
normal
cyclic
prefix
,
N
ports
CSI
=
4
l
=
l
′
+
{
l
″
CSI
reference
signal
configurations
0
-
19
,
normal
cyclic
prefix
2
l
″
CSI
reference
signal
configurations
20
-
31
,
normal
cyclic
prefix
l
″
=
0
,
1
k
″
=
0
,
1
for
normal
cyclic
prifix
i
=
2
k
″
+
l
″
m
=
0
,
1
,
…
,
N
RB
DL
-
1
m
′
=
m
+
⌊
N
RB
max
,
DL
-
N
RB
DL
2
⌋
,
wherein N ports CSI is a number of CSI-RS antenna ports per resource, wherein when a total number of antenna ports is 12, a number of CSI-RS antenna ports per resource, N ports CSI-RS is 4 and number of CSI-RS resources, N res CSI-RS is 3, and when the total number of CSI-RS antenna ports is 16, the number of CSI-RS antenna ports per resource, N ports CSI-RS is 8 and the number of CSI-RS resources, N res CSI-RS is 2.
14. The method of claim 13 , wherein when the total number of CSI-RS antenna ports is 12, CSI-RS antenna ports p′=15, 16, 17 and 18 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
15. The method of claim 13 , wherein when the total number of CSI-RS antenna ports is 16, CSI-RS antenna ports p′=15, 16, 19 and 20 are assigned with Orthogonal Covering Code (OCC) indices 0, 1, 2 and 3, respectively and CSI-RS antenna ports p′=17, 18, 21 and 22 are assigned with OCC indices 0, 1, 2 and 3, respectively,
wherein the sequence w p′ (i) is identified according to a following table:
OCC index
[w p′ (0) w p′ (1) w p′ (2) w p′ (3)]
0
[1 1 1 1]
1
[1 −1 1 −1]
2
[1 1 −1 −1]
3
[1 −1 −1 1].
16. The method of claim 13 , wherein antenna port number p is determined based on a number of CSI-RS antenna port number p′, according to p=p′+iN ports CSI-RS , where p′ε{15,16, . . . ,15+N ports CSI-RS −1}, wherein i=n−1 and nε{1, . . . , N res CSI-RS }.