US 2022/0029674 A1 · Methods and Apparatuses for Feedback Reporting in a Wireless Communications Network

Abstract

The embodiments herein relate to a method performed by a UE (900) for providing a channel state information (CSI) feedback in a wireless communication system including at least the UE and a gNB (800) or a radio network node. The UE (900) is operative, by means of e.g. the processor (910) to: estimate the MIMO channel between the gNB (800) and the UE (910) based on received DL reference signals for the configured resource blocks. The UE (900) is further operative to calculate, based on a performance metric, a precoder matrix, for a number of antenna ports of the gNB (800) and configured subbands, the precoder matrix being based on two codebooks and a set of combination coefficients for complex scaling/combining one or more of vectors selected from a first codebook and a second codebook, and the UE (900) is operative to report a CSI feedback and/or a PMI and/or a PMI/RI, to the gNB (800), used to indicate the precoder matrix for the configured antenna ports and resource blocks.

Claims26

Dependent claims

1-49. (canceled)

A method performed by a User Equipment (UE) the method comprising:

receiving from a network node, a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
estimating said MIMO channel based on said received at least one DL reference signal for configured resource blocks;
calculating a precoding matrix for a number of antenna ports of the network node and configured subbands;
the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix;
quantizing the combining coefficients per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l) is a product of three coefficients al,p,i, bl,p,i,j and dl,p,i,j, and is given by:
γp,i,j(l)=al,p,ibl,p,i,jdl,p,i,j,
where al,p,i is a real-valued coefficient representing a common amplitude across all combining coefficients associated with a i-th beam, p-th polarization and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes al,p,i are partitioned, per layer, into at least two disjoint subsets, and each subset is assigned a single and different value for said quantization, and wherein each subset contains the amplitudes al,p,i with respect to a single polarization;
and
reporting, to the network node, a Channel State Information (CSI) feedback and/or a Precoder Matrix Indicator (PMI) and/or a PMI/Rank Indicator (PMI/RI) used to indicate the precoding matrix for the configured antenna ports and subbands, wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of said set of quantized combining coefficients included in the report transmitted to the network node.

58 more elements

A method performed by a User Equipment (UE) the method comprising:

receiving from a network node, a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
estimating said MIMO channel based on said received at least one DL reference signal for configured resource blocks;
calculating a precoding matrix for a number of antenna ports of the network node and configured subbands;
the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix;
quantizing the combining coefficients per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l) is a product of three coefficients cl,p,j, bl,p,i,j and dl,p,i,j,
γp,i,j(l)=cl,p,jbl,p,i,jdl,p,i,j,
where cl,p,j is a polarization-dependent real-valued coefficient representing a common amplitude across all combining coefficients associated with the j-th delay vector and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes cl,p,j are partitioned, per layer, into at least two disjoint subsets, and each subset is assigned a single and different value for said quantization;
and wherein each subset contains the amplitudes cl,p,j with respect to a single polarization;
and
reporting, to the network node, a Channel State Information (CSI) feedback and/or a Precoder matrix Indicator, PMI and/or a PMI/Rank Indicator, PMI/RI, used to indicate the precoding matrix for the configured antenna ports and subbands, wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of said set of quantized combining coefficients included in the report transmitted to the network node.

59 more elements

A method performed by a network node the method comprising:

transmitting to a User Equipment (UE) a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
and
receiving, from the UE, a report including a Channel State Information (CSI) feedback and/or a Precoder Matrix Indicator (PMI) and/or a PMI/Rank Indicator (PMI/RI) used to indicate a precoding matrix for configured antenna ports and configured subbands, the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix,
wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of a set of quantized combining coefficients included in the received report from the UE, wherein the combining coefficients are quantized by the UE per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l), is a product of three coefficients al,p,i, bl,p,i,j and dl,p,i,j, and is given by:
γp,i,j(l)=al,p,ibl,p,i,jdl,p,i,j,
where al,p,i is a real-valued coefficient representing a common amplitude across all combining coefficients associated with a i-th beam, p-th polarization and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes al,p,i are partitioned, per layer, into at least two disjoint subsets, and wherein each subset is assigned a single and different value for said quantization, and wherein each subset contains the amplitudes al,p,i with respect to a single polarization.

55 more elements

A method performed by a network node the method comprising:

transmitting to a User Equipment (UE) a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
and
receiving, from the UE, a report including a Channel State Information (CSI) feedback and/or a Precoder Matrix Indicator (PMI) and/or a PMI/Rank Indicator (PMI/RI) used to indicate a precoding matrix for configured antenna ports and configured subbands, the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix, and
wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of a set of quantized combining coefficients included in the received report from the UE, wherein the combining coefficients are quantized by the UE per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l) is a product of three coefficients cl,p,j, bl,p,i,j and dl,p,i,j,
γp,i,j(l)=cl,p,jbl,p,i,jdl,p,i,j,
where cl,p,j is a polarization-dependent real-valued coefficient representing a common amplitude across all combining coefficients associated with the j-th delay vector and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes cl,p,j are partitioned, per layer, into at least two disjoint subsets, and each subset is assigned a single and different value for said quantization;
and wherein each subset contains the amplitudes cl,p,j with respect to a single polarization.

56 more elements

A User Equipment (UE) comprising a processor and a memory, said memory containing instructions executable by said processor whereby said UE is operative to:

receive, from a network node, a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
estimate said MIMO channel based on said received at least one DL reference signal for configured resource blocks;
calculate a precoding matrix for a number of antenna ports of the network node and configured subbands, the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix;
quantize the combining coefficients per beam of the precoding matrix, wherein each combining coefficient γp,i,jd(l) is a product of three coefficients al,p,i, bi,p,i,j and dl,p,i,j, and is given by:
γp,i,j(l)=al,p,ibl,p,i,jdl,p,i,j,
where al,p,i is a real-valued coefficient representing a common amplitude across all combining coefficients associated with a i-th beam, p-th polarization and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes al,p,i are partitioned, per layer, into at least two disjoint subsets, and each subset is assigned a single and different value for said quantization, and wherein each subset contains the amplitudes al,p,i with respect to a single polarization;
and
report, to the network node, a Channel State Information (CSI) feedback and/or a Precoder matrix Indicator (PMI) and/or a PMI/Rank Indicator, (PMI/RI), used to indicate the precoding matrix for the configured antenna ports and subbands, wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of said set of quantized combining coefficients included in the report transmitted to the network node.

57 more elements

A network node comprising a processor and a memory, said memory containing instructions executable by said processor whereby said network node is operative to:

transmit, to a User Equipment (UE) a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
and
receive, from the UE, a report including a Channel State Information (CSI) feedback and/or a Precoder Matrix Indicator (PMI) and/or a PMI/Rank Indicator (PMI/RI) used to indicate a precoding matrix for configured antenna ports and configured subbands, the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix, and
wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of a set of quantized combining coefficients included in the received report from the UE, wherein the combining coefficients are quantized by the UE per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l) is a product of three coefficients al,p,i, bl,p,i,j and dl,p,i,j, and is given by:
γp,i,j(l)=al,p,ibl,p,jdl,p,i,j,
where al,p,i is a real-valued coefficient representing a common amplitude across all combining coefficients associated with a i-th beam, p-th polarization and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l), wherein the amplitudes al,p,i are partitioned, per layer, into at least two disjoint subsets, and wherein each subset is assigned a single and different value for said quantization, and wherein each subset contains the amplitudes al,p,i with respect to a single polarization.

54 more elements

A User Equipment (UE) comprising a processor and a memory, said memory containing instructions executable by said processor whereby said UE is operative to:

receive, from a network node, a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
estimate said MIMO channel based on said received at least one DL reference signal for configured resource blocks;
calculate a precoding matrix for a number of antenna ports of the network node and configured subband, the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix;
quantize the combining coefficients per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l) is a product of three coefficients cl,p,j, bl,p,i,j and dl,p,i,j,
γp,i,j(l)=cl,p,jbl,p,i,jdl,p,i,j,
where cl,p,j is a polarization-dependent real-valued coefficient representing a common amplitude across all combining coefficients associated with the j-th delay vector and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes cl,p,j are partitioned, per layer, into at least two disjoint subsets, and each subset is assigned a single and different value for said quantization;
and wherein each subset contains the amplitudes cl,p,j with respect to a single polarization;
and
report, to the network node, a Channel State Information (CSI) feedback and/or a Precoder matrix Indicator (PMI) and/or a PMI/Rank Indicator (PMI/RI) used to indicate the precoding matrix for the configured antenna ports and subbands, wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of said set of quantized combining coefficients included in the report transmitted to the network node.

58 more elements

A network node comprising a processor and a memory, said memory containing instructions executable by said processor whereby said network node is operative:

transmit to a User Equipment (UE) a radio signal via a Multiple Input Multiple Output (MIMO) channel, wherein the radio signal contains at least one DownLink (DL) reference signal according to a DL reference signal configuration;
and
receive, from the UE, a report including a Channel State Information (CSI) feedback and/or a Precoder Matrix Indicator (PMI) and/or a PMI/Rank Indicator (PMI/RI) used to indicate a precoding matrix for configured antenna ports and configured subbands, the precoding matrix being based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook, wherein the first codebook contains one or more transmit-side spatial beam components/vectors of the precoding matrix and the second codebook contains one or more delay components/vectors of the precoding matrix, and
wherein the report contains a bitmap for indicating at least selected delay vectors and spatial beam vectors associated with non-zero combining coefficients of a set of quantized combining coefficients included in the received report from the UE, wherein the combining coefficients are quantized by the UE per beam of the precoding matrix, wherein each combining coefficient γp,i,j(l) is a product of three coefficients cl,p,j, bl,p,i,j and dl,p,i,j,
γp,i,j(l)=cl,p,jbl,p,i,jdl,p,i,j,
where cl,p,j is a polarization-dependent real-valued coefficient representing a common amplitude across all combining coefficients associated with the j-th delay vector and l-th layer, bl,p,i,j is a real-valued normalized combining-coefficient representing the amplitude associated with the i-th beam, j-th delay vector, p-th polarization and l-th layer, and
d
l
,
p
,
i
,
j
=
exp
⁡
(
j
⁢
2
⁢
π
⁢
n
2
N
)
;
n
∈
{
0
,
1
,
…
⁢
,
2
N
-
1
}
,
N
∈
{
1
,
2
,
3
,
4
}
is a coefficient to indicate the phase of γp,i,j(l);
wherein the amplitudes cl,p,j are partitioned, per layer, into at least two disjoint subsets, and each subset is assigned a single and different value for said quantization;
and wherein each subset contains the amplitudes cl,p,j with respect to a single polarization.

56 more elements

Dependencies are inferred from the claim text.

Methods and Apparatuses for Feedback Reporting in a Wireless Communications Network

Life of this patent

Methods and Apparatuses for Feedback Reporting in a Wireless Communications Network

Life of this patent

Abstract

Claims26