Method and apparatus for CSI codebook parameters
Apparatuses and methods for channel state information (CSI) codebook parameters. A method performed by a user equipment (UE) includes receiving information about a channel state information (CSI) report, the information indicating N>1 CSI reference signal (CSI-RS) resources and a codebook. The codebook includes a spatial-domain (SD) basis component, a frequency-domain (FD) basis component, and a coefficient component. The SD basis component includes L r basis vectors for each CSI-RS resource r=1, . . . , N. The FD basis component includes M v basis vectors. The coefficient component includes coefficients associated with (SD, FD) basis vector pairs. The information includes codebook parameters. The method further includes, based on the information, measuring the N CSI-RS resources; determining, based on the codebook parameters, the SD basis component, the FD basis component, and the coefficient component; and transmitting the CSI report.
1 . A user equipment (UE) comprising:
a transceiver configured to receive, via higher layer signaling, first configuration information on a channel state information (CSI) report and second configuration information on N TRP >1 CSI reference signal (CSI-RS) resources, wherein the first configuration information includes codebook configuration information, and wherein the codebook configuration information includes codebook type information indicating a Type II coherent joint transmission (CJT) codebook; and
a processor operably coupled to the transceiver, the processor configured to:
determine codebook parameters for the Type II CJT codebook based on the codebook configuration information, wherein the codebook parameters include:
p
v
=
{
1
8
for
v
=
1
,
2
1
1
6
for
v
=
3
,
4
,
(
L
1
,
L
2
,
…
,
L
N
)
,
and β where:
p v is a codebook parameter associated with M v vectors,
v is a number of layers, and
β is a parameter associated with a number of non-zero coefficients; and
determine the CSI report based on L r vectors, M v vectors, and the non-zero coefficients for the Type II CJT codebook, wherein r=1, . . . , N TRP AND L r corresponds to a CSI-RS resource among the N TRP CSI-RS resources,
wherein the transceiver is further configured to transmit the CSI report.
2 . The UE of claim 1 , wherein, when
N
=
2
,
β
=
1
4
and
(
L
1
,
L
2
)
=
(
2
,
2
)
,
(
L
1
,
L
2
)
=
(
2
,
4
)
,
or
(
L
1
,
L
2
)
=
(
4
,
2
)
.
3 . The UE of claim 1 , wherein the N TRP CSI-RS resources correspond to N TRP transmission and reception points (TRPs) associaed with the Type II CJT codebook.
4 . The UE of claim 1 , wherein, when
N
=
3
,
β
=
1
4
or
1
2
and
(
L
1
,
L
2
,
L
3
)
=
(
2
,
2
,
2
)
,
(
L
1
,
L
2
,
L
3
)
=
(
2
,
2
,
4
)
,
(
L
1
,
L
2
,
L
3
)
=
(
2
,
4
,
2
)
,
(
L
1
,
L
2
,
L
3
)
=
(
4
,
2
,
2
)
,
or
(
L
1
,
L
2
,
L
3
)
=
(
4
,
4
,
4
)
.
5 . The UE of claim 1 , wherein, when
N
=
4
,
β
=
1
4
and
(
L
1
,
L
2
,
L
3
,
L
4
)
=
(
2
,
2
,
2
,
2
)
,
or
(
L
1
,
L
2
,
L
3
,
L
4
)
=
(
2
,
2
,
2
,
4
)
.
6 . The UE of claim 1 , wherein, when
N
=
4
,
β
=
1
2
and
(
L
1
,
L
2
,
L
3
,
L
4
)
=
(
4
,
4
,
4
,
4
)
.
7 . The UE of claim 1 , wherein:
L r vectors are spatial domain, SD, basis vectors of SD basis component for the Type II CJT codebook, and
the My vectors are frequency domain, FD, basis vectors of FD basis component for the Type II CJT codebook.
8 . The UE of claim 1 , wherein:
the codebook parameters further include L max , where L max ≥Σ N TRP r=1 L r ,
the processor is further configured to determine L r for r=1, 2, . . . , N TRP under a constraint of L max ≥Σ r=1 N L r , and
the CSI report further includes an indicator indicating L r for r=1, 2, . . . , N TRP .
9 . A base station (BS) comprising:
transceiver configured to:
transmit, via higher layer signaling, first configuration information on a channel state information (CSI) report and second configuration information on N TRP >1 CSI reference signal (CSI-RS) resources, wherein:
the first configuration information includes codebook configuration information and
the codebook configuration information includes codebook type information indicating a Type II coherent joint transmission (CJT) codebook,
codebook parameters for the Type II CJT codebook are based on the codebook configuration information, and
the codebook parameters include:
p
v
=
{
1
8
for
v
=
1
,
2
1
1
6
for
v
=
3
,
4
,
(
L
1
,
L
2
,
…
,
L
N
)
,
and β where:
p v is a codebook parameter associated with M v vectors,
V is a number of layers, and
β is a parameter associated with a number of non-zero coefficients; and
receive the CSI report; and
a processor operably coupled to the transceiver, the processor configured to determine, based on the CSI report, L r , vectors, the M v vectors and the non-zero coefficients for the Type II CJT codebook, wherein r = 1 , . . . , N TRP and L, corresponds to a CSI-RS resource among the N TRP CSI-RS resources.
10 . The BS of claim 9 , wherein, when
N
=
2
,
β
=
1
4
and
(
L
1
,
L
2
)
=
(
2
,
2
)
,
(
L
1
,
L
2
)
=
(
2
,
4
)
,
or
(
L
1
,
L
2
)
=
(
4
,
2
)
.
11 . The BS of claim 9 , wherein the N TRP CSI-RS resources correspond to N TRP transmission and reception points (TRPs) associated with the Type II CJT codebook.
12 . The BS of claim 9 , wherein, when
N
=
3
,
β
=
1
4
or
1
2
and
(
L
1
,
L
2
,
L
3
)
=
(
2
,
2
,
2
)
,
(
L
1
,
L
2
,
L
3
)
=
(
2
,
2
,
4
)
,
(
L
1
,
L
2
,
L
3
)
=
(
2
,
4
,
2
)
,
(
L
1
,
L
2
,
L
3
)
=
(
4
,
2
,
2
)
,
or
(
L
1
,
L
2
,
L
3
)
=
(
4
,
4
,
4
)
.
13 . The BS of claim 9 , wherein, when
N
=
4
,
β
=
1
4
and
(
L
1
,
L
2
,
L
3
,
L
4
)
=
(
2
,
2
,
2
,
2
)
,
or
(
L
1
,
L
2
,
L
3
,
L
4
)
=
(
2
,
2
,
2
,
4
)
.
14 . The BS of claim 9 , wherein, when
N
=
4
,
β
=
1
2
and
(
L
1
,
L
2
,
L
3
,
L
4
)
=
(
4
,
4
,
4
,
4
)
.
15 . The BS of claim 9 , wherein:
L r vectors are spatial domain, SD, basis vectors of SD basis component for the Type II CJT codebook, and
the My vectors are frequency domain, FD, basis vectors of FD basis component for the Type II CJT codebook.
16 . The BS of claim 15 , wherein:
the codebook parameters further include L max , where L max ≥Σ N TRP r=1 L r ,
L r for r=1, 2, . . . , N TRP is under a constraint of L max ≥Σ r=1 N L r , and
the CSI report further includes an indicator indicating L r for r=1, 2, . . . , N.
17 . A method performed by a user equipment (UE), the method comprising:
receiving, via higher layer signaling, first configuration information on a channel state information (CSI) report and second configuration information on N TRP >1 CSI reference signal (CSI-RS) resources, wherein the first configuration information includes codebook configuration information, and wherein the codebook configuration information includes codebook type information indicating a Type II coherent joint transmission (CJT) codebook;
determining codebook parameters for the Type II CJT codebook based on the codebook configuration information, wherein the codebook parameters include:
p
v
=
{
1
8
for
v
=
1
,
2
1
1
6
for
v
=
3
,
4
,
(
L
1
,
L
2
,
…
,
L
N
)
,
and β where:
p v is a codebook parameter associated with M v vectors,
v is a number of layers, and
β is a parameter associated with a number of non-zero coefficients of the coefficient;
determining the CSI report based on L r vectors, the M v vectors, and the non-zero coefficients for the Type II CJT codebook, wherein r=1, . . . , N TRP and L r corresponds to a CSI-RS resource among the N TRP CSI-RS resources; and
transmitting the CSI report.
18 . The method of claim 17 , wherein, when
N
=
2
,
β
=
1
4
and
(
L
1
,
L
2
)
=
(
2
,
2
)
,
(
L
1
,
L
2
)
=
(
2
,
4
)
,
or
(
L
1
,
L
2
)
=
(
4
,
2
)
.
19 . The method of claim 17 , wherein the N TRP CSI-RS resources correspond to N TRP transmission and reception points (TRPs) associated with the Type II CJT codebook.
20 . The method of claim 17 , wherein, when
N
=
3
,
β
=
1
4
or
1
2
and
(
L
1
,
L
2
,
L
3
)
=
(
2
,
2
,
2
)
,
(
L
1
,
L
2
,
L
3
)
=
(
2
,
2
,
4
)
,
(
L
1
,
L
2
,
L
3
)
=
(
2
,
4
,
2
)
,
(
L
1
,
L
2
,
L
3
)
=
(
4
,
2
,
2
)
,
or
(
L
1
,
L
2
,
L
3
)
=
(
4
,
4
,
4
)
.