US 10,312,981 B2Granted

User equipment and methods for codebook subsampling for enhanced 4TX codebooks

AssigneeIntel IP Corporation

InventorsXiaogang Chen, Yuan Zhu, Qinghua Li

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Abstract

Embodiments of user equipment (UE) and methods for codebook subsampling for enhanced 4TX codebooks in 3GPP LTE wireless networks are generally described herein. In some embodiments, a physical uplink control channel (PUCCH) is configured for transmission of channel state information (CSI) feedback including a rank indicator (RI) and a precoding matrix (W1). The rank indicator (RI) and a precoding matrix (W1) are jointly encoded and codebook subsampling is performed for the enhanced 4Tx codebook for at least one of: PUCCH report type 5 (RI/1st PMI) in PUCCH 1-1 submode 1; PUCCH report type 2c (CQI/1st PMI/2nd PMI) in PUCCH 1-1 submode 2; and PUCCH report type 1a (subband CQI/2nd PMI) in PUCCH 2-1.

Claims15

Dependent claims

An apparatus of a User Equipment (UE) arranged for channel state information (CSI) reporting using a subsampled four transmit (4TX) antenna codebook, the apparatus comprising:

memory;
and
processing circuitry coupled to the memory, to:
configure the UE for periodic physical uplink control channel (PUCCH) channel-state information (CSI) reporting in accordance with one of a plurality of PUCCH reporting types, the CSI reporting including a rank indicator (RI) and a precoding matrix (W1) that are jointly coded using the subsampled 4TX antenna codebook, the PUCCH reporting types including PUCCH reporting types for four antenna ports,
the PUCCH reporting types for four antenna ports including:
a PUCCH reporting type 1a for reporting a subband channel quality indicator (CQI) and a second precoding matrix indicator (PMI),
a PUCCH reporting type 2c for reporting a CQI, a first PMI and the second PMI, and
a PUCCH reporting type 5 for reporting the RI and the first PMI;
and
encode a CSI report for transmission on the PUCCH in accordance with the one of the plurality of PUCCH reporting types,
wherein the PUCCH reporting types indicate a CQI report or a PMI report,
wherein when the UE is configured for PUCCH reporting type 2c, the processing circuitry is configured to select a single precoding matrix from the subsampled enhanced 4Tx codebook,
wherein the CQI is calculated based on the selected single precoding matrix, and
wherein the first PMI and the second PMI correspond to the selected single precoding matrix,
wherein the memory is configured to store configuration information for the PUCCH reporting types and PUCCH reporting sub-modes, and
wherein when the UE is configured to support a maximum 2 layer transmission, there is no subsampling and the RI and the W1 are jointly encoded following Table 1,
TABLE 1
W1 index after
No. W1
RI
sub-sampling
hypotheses
1
0~15
16
2
0~15
16
Total no. W1 + RI hypotheses across ranks 1-2
32 (5 bits)
(max. layers = 2)
and
wherein when the UE is configured to support a maximum layer 4 transmission, the RI and the W1 are jointly encoded following table 2-1 or table 2-2
TABLE 2-1
W1 index after
No. W1
RI
sub-sampling
hypotheses
1
0~15
16
2
0, 2, 4, 6, 8, 10, 12, 14
8
3
0
1
4
0
1
Total no. W1 + RI hypotheses across ranks 1-4
26 (5 bits)
(max. layers = 4)
TABLE 2-2
No. W1
RI
W1 index after sub-sampling
hypotheses
1
0~15
16
2
0~7
8
3
0
1
4
0
1
Total no. W1 + RI hypotheses across ranks 1-4 (max.
26 (5 bits)
layers = 4).

71 more elements

A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a User Equipment (UE), the UE arranged for channel state information (CSI) reporting using a subsampled four transmit (4TX) antenna codebook, the processing circuitry configured to:

configure the UE to perform operations for periodic physical uplink control channel (PUCCH) channel-state information (CSI) reporting in accordance with one of a plurality of PUCCH reporting types for four antenna ports, the CSI reporting including a rank indicator (RI) and a precoding matrix (W1) that are jointly precoded using the subsampled 4TX antenna codebook, the PUCCH reporting types including PUCCH reporting types for four antenna ports,
wherein the PUCCH reporting types for four antenna ports include:
a PUCCH reporting type 1a for reporting a subband channel quality indicator (CQI) and a second precoding matrix indicator (PMI),
a PUCCH reporting type 2c for reporting a CQI, a first PMI and the second PMI, and
a PUCCH reporting type 5 for reporting the RI and the first PMI;
and
configure the UE to encode a CSI report for transmission on the PUCCH in accordance with the one of the plurality of PUCCH reporting types,
wherein the PUCCH reporting types indicate a CQI report or a PMI report
wherein when the UE is configured for PUCCH reporting type 2c, the processing circuitry is configured to select a single precoding matrix from the subsampled 4TX codebook,
wherein the CQI is calculated based on the selected single precoding matrix,
wherein the first PMI and the second PMI correspond to the selected single precoding matrix,
wherein the memory is configured to store configuration information for the PUCCH reporting types and PUCCH reporting sub-modes, and
wherein when the UE is configured to support a maximum 2 layer transmission, there is no subsampling and the RI and the W1 are jointly encoded following Table 1,
TABLE 1
W1 index after
No. W1
RI
sub-sampling
hypotheses
1
0~15
16
2
0~15
16
Total no. W1 + RI hypotheses across ranks 1-2
32 (5 bits)
(max. layers = 2)
and
wherein when the UE is configured to support a maximum layer 4 transmission, the RI and the W1 are jointly encoded following Table 3-1 or Table 3-2
TABLE 3-1
W1 index after
No. W1
RI
sub-sampling
hypotheses
1
0~15
16
2
0~6, 8~14
14
3
0
1
4
0
1
Total no. W1 + RI hypotheses across ranks 1-4
32 (5 bits)
(max. layers = 4)
TABLE 3-2
No. W1
RI
W1 index after sub-sampling
hypotheses
1
0~15
16
2
0~3
14
3
0
1
4
0
1
Total no. W1 + RI hypotheses across ranks 1-4 (max.
32 (5 bits)
layers = 4).

68 more elements

A method for reporting channel state information (CSI) using a subsampled four transmit 4Tx antenna codebook, performed by a User Equipment (UE), the method comprising:

configuring the UE to perform operations for periodic physical uplink control channel (PUCCH) channel-state information (CSI) reporting in accordance with one of a plurality of PUCCH reporting types, the CSI reporting including a rank indicator (RI) and a precoding matrix (W1) that are jointly precoded using the subsampled 4TX antenna codebook, the PUCCH reporting types including PUCCH reporting types for four antenna ports,
wherein the PUCCH reporting types for four antenna ports include:
a PUCCH reporting type 1a for reporting a subband channel quality indicator (CQI) and a second precoding matrix indicator (PMI),
a PUCCH reporting type 2c for reporting a CQI, a first PMI and the second PMI, and
a PUCCH reporting type 5 for reporting the RI and the first PMI;
and
encoding a CSI report for transmission on the PUCCH in accordance with the one of the plurality of PUCCH reporting types,
wherein the PUCCH reporting types indicate one of a CQI report and a PMI report,
wherein UE is configured to store configuration information for the PUCCH reporting types and PUCCH sub-modes
wherein when the UE is configured for PUCCH reporting type 2c, the method further comprises configuring the UE to select a single precoding matrix from the subsampled 4TX codebook,
wherein the CQI is calculated based on the selected single precoding matrix,
wherein the first PMI and the second PMI correspond to the selected single precoding matrix, and for ranks 1 and 2, Table 4-1 or Table 4-2 is used for codebook subsampling
TABLE 4-1
No. W1 + W2
RI
W1 + W2 index after sub-sampling
hypotheses
1
W1:
0, 2, 4, 6, 8, 10, 12, 14 or 1, 3, 5, 7, 9, 11,
128 (7 bits)
13,15
W2:
0~15
2
W1:
0, 2, 4, 6, 8, 10, 12, 14 or 1, 3, 5, 7, 9, 11,
8 × 2 = 16
13, 15
(4 bits)
W2:
for each W1, choose only
(Y1, Y2) = (e1, e1) with all 2 possible
co-phasing, i.e.
W
2
,
n
∈
{
1
2
⁡
[
Y
1
Y
2
Y
1
-
Y
2
]
,
1
2
⁡
[
Y
1
Y
2
j
⁢
⁢
Y
1
-
j
⁢
⁢
Y
2
]
}
,
with
⁢
(
Y
⁢
⁢
1
,
Y
⁢
⁢
2
)
=
(
e
⁢
⁢
1
,
e
⁢
⁢
2
)
TABLE 4-2
No. W1 + W2
RI
W1 + W2 index after sub-sampling
hypotheses
1
W1:
0, 2, 4, 6, 8, 10, 12, 14 or
128 (7 bits)
1, 3, 5, 7, 9, 11, 13, 15
W2:
0~15
2
W1:
0, 4, 8, 12 or 1, 5, 9, 13 or
4 × (2 + 1 + 1) =
2, 6, 10, 14 or 3, 7, 11, 15
16 (4 bits)
W2:
for each W1, choose
(Y1, Y2) = (e1, e1)
with all 2 possible co-phasing, [[i.e.]]
W
2
,
n
∈
{
1
2
⁡
[
Y
1
Y
2
Y
1
-
Y
2
]
,
⁢
1
2
⁡
[
Y
1
Y
2
jY
1
-
jY
2
]
}
,
with
⁢
⁢
(
Y
⁢
⁢
1
,
Y
⁢
⁢
2
)
=
(
e
⁢
⁢
1
,
e
⁢
⁢
1
)
;
and
⁢
⁢
choose
⁢
⁢
(
Y
⁢
⁢
1
,
Y
⁢
⁢
2
)
=
(
e
⁢
⁢
2
,
e
⁢
⁢
4
)
⁢
with
⁢
⁢
W
2
,
n
=
{
1
2
⁡
[
Y
1
Y
2
Y
1
Y
2
]
}
;
and
⁢
⁢
choose
⁢
⁢
(
Y
⁢
⁢
1
,
Y
⁢
⁢
2
)
=
(
e
⁢
⁢
1
,
e
⁢
⁢
3
)
⁢
with
⁢
⁢
W
2
,
n
∈
{
1
2
⁡
[
Y
1
Y
2
Y
2
-
Y
1
]
}
.

295 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/413,182Filed 23 Jan 2017 · continuation
Priority: 31 May 2013
Published: US 2017/0272136 A121 Sep 2017
Granted: 4 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

H04B 7/0456
MIMO systems: selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
H04B 7/0452
MIMO systems: multi-user MIMO systems
H04B 7/0486
Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting: taking channel rank into account
H04B 7/0617
Of weighted versions of same signal: for beam forming

Family

Application61/829,968Us provisional application · filed 31 May 2013
Application14/108,648Parent of this continuation · filed 17 Dec 2013
Application14/739,815Parent of this continuation · filed 15 Jun 2015
US 2017/0272136 A1Pre-grant publication · published 21 Sep 2017
US 9,553,643 B2Parent of this continuation
US 9,071,297 B2Parent of this continuation
US 2014/0355705 A1Published application
US 2016/0006493 A1Published application
US 10,312,981 B2This patent

From the US filing history. Foreign family members aren’t listed.

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