# US 10,375,580 B2 · Higher order MU-MIMO for LTE-A

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- Number: US 10,375,580 B2
- Document ID: US10375580B2
- Status: Granted
- Kind: B2
- Application number: 15/717,687
- Filed: 2017-09-27
- Published: 2018-02-01
- Granted: 2019-08-06
- Earliest claimed: 2017-09-27
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Yuan Zhu; Alexei Vladimirovich Davydov
- Web page: https://patentgrep.com/patent/US10375580B2

## CPC

- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04B 7/0452: Multi-user MIMO systems
- H04B 7/0665: {Feed forward of transmit weights to the receiver}
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/06: using space diversity
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An access node of a 3GPP LTE-based wireless communication network comprises a transmitter portion that transmits downlink control information (DCI) to at least one wireless station of a plurality of wireless stations wirelessly accessing the node as a Multi-User Multiple Input Multiple Output (MU-MIMO) wireless communication network. The DCI comprises at least one code word indicating a rank of a channel matrix between the transmitter portion of the node and the wireless station greater than 4 and a spatial-related configuration for the wireless station. In one exemplary embodiment, the transmitter portion transmits the DCI from one substantially localized geographical transmission point forming a single-cell access point for the plurality of wireless stations. In another exemplary embodiment, the transmitter portion transmits the DCI from multiple geographically substantially isolated transmission points forming a single-cell access point.

## Claims

### Claim 1

An apparatus of a user equipment (UE), comprising:
a baseband processor to decode downlink control information (DCI) received from a node of a network, wherein the DCI includes an indication of one or more antenna ports, a scrambling identifier (ID), a number of layers, and up to a length-4 orthogonal cover code (OCC) for the UE to transmit or receive a Multi-user Multiple-Input Multiple-Output (MU-MIMO) data signal; and
a memory to store the downlink control information;
wherein the downlink control information includes values corresponding to a table comprising:
One Codeword:
Two Codewords:
Codeword 0 enabled,
Codeword 0 enabled,
Codeword 1 disabled
Codeword 1 enabled
Value
Message
Value
Message
0
1 layer, port 7, nSCID = 0
0
2 layers, ports 7-8, nSCID = 0
1
1 layer, port 7, nSCID = 1
1
2 layers, ports 7-8, nSCID = 1
2
1 layer, port 8, nSCID = 0
2
3 layers, ports 7-9
3
1 layer, port 8, nSCID = 1
3
4 layers, ports 7-10
4
2 layers, ports 7-8, nSCID = 0
4
5 layers, ports 7-11
5
3 layers, ports 7-9
5
6 layers, ports 7-12
6
4 layers, ports 7-10
6
7 layers, ports 7-13
7
1 layer, port 7, nSCID = 2
7
8 layers, ports 7-14
8
1 layer, port 7, nSCID = 3
8
2 layers, ports 7-8, nSCID = 2
9
1 layer, port 8, nSCID = 2
9
2 layers, ports 7-8, nSCID = 3
10
1 layer, port 8, nSCID = 3
10
2 layers, ports 7-8, nSCID =
0, 2 DMRS Group
11
2 layers, ports 7-8, nSCID = 1
11
2 layers, ports 11, 13, nSCID =
0, 2 DMRS Group
12
2 layers, ports 7-8, nSCID = 2
12
2 layers, ports 9-10, nSCID =
0, 2 DMRS Group
13
2 layers, ports 7-8, nSCID = 3
13
2 layers, ports 12, 14, nSCID =
0, 2 DMRS Group
14
1 layer, port 11, nSCID = 0
14
3 layers, ports 10, 12, 11
15
1 layer, port 13, nSCID = 0
15
4 layers, ports 11, 13, 12, 14.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein up to rank 8 MU-MIMO is supported for the UE to transmit using one layer and four scrambling IDs.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein up to rank 4 MU-MIMO is supported with orthogonal Demodulation Reference Signals (DMRS).

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein up to rank 8 MU-MIMO is supported for the UE to transmit using two layers using different Demodulation Reference Signals (DMRS) and scrambling ID combinations.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein up to rank 8 MU-MIMO is supported for the UE to transmit using two layers, wherein each layer is mapped to one code word.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein up to rank 8 MU-MIMO is supported for the UE to transmit using two layers such that the Demodulation Reference Signals (DMRS) are orthogonal.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the UE has rank 3 or 4 and is to be paired with another UE having rank 3 or 4, respectively.

### Claim 8

An apparatus of an evolved Node B (eNB), comprising:
a baseband processor to encode downlink control information (DCI) for one or more user equipment (UE) devices on a network, wherein the DCI includes an indication of one or more antenna ports, a scrambling identifier (ID), a number of layers, and up to a length-4 orthogonal cover code (OCC) for the one or more UE devices to transmit or receive a Multi-user Multiple-Input Multiple-Output (MU-MIMO) data signal; and
a memory to store the downlink control information;
wherein the downlink control information includes values corresponding to a table comprising:
One Codeword:
Two Codewords:
Codeword 0 enabled,
Codeword 0 enabled,
Codeword 1 disabled
Codeword 1 enabled
Value
Message
Value
Message
0
1 layer, port 7, nSCID = 0
0
2 layers, ports 7-8, nSCID = 0
1
1 layer, port 7, nSCID = 1
1
2 layers, ports 7-8, nSCID = 1
2
1 layer, port 8, nSCID = 0
2
3 layers, ports 7-9
3
1 layer, port 8, nSCID = 1
3
4 layers, ports 7-10
4
2 layers, ports 7-8,
4
5 layers, ports 7-11
nSCID = 0
5
3 layers, ports 7-9
5
6 layers, ports 7-12
6
4 layers, ports 7-10
6
7 layers, ports 7-13
7
1 layer, port 7, nSCID = 2
7
8 layers, ports 7-14
8
1 layer, port 7, nSCID = 3
8
2 layers, ports 7-8, nSCID = 2
9
1 layer, port 8, nSCID = 2
9
2 layers, ports 7-8, nSCID = 3
10
1 layer, port 8, nSCID = 3
10
2 layers, ports 7-8, nSCID =
0, 2 DMRS Group
11
2 layers, ports 7-8,
11
2 layers, ports 11, 13, nSCID =
nSCID = 1
0, 2 DMRS Group
12
2 layers, ports 7-8,
12
2 layers, ports 9-10, nSCID =
nSCID = 2
0, 2 DMRS Group
13
2 layers, ports 7-8,
13
2 layers, ports 12, 14, nSCID =
nSCID = 3
0, 2 DMRS Group
14
1 layer, port 11, nSCID = 0
14
3 layers, ports 10, 12, 11
15
1 layer, port 13, nSCID = 0
15
4 layers, ports 11, 13, 12, 14.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein the DCI includes a configuration to support up to rank 8 MU-MIMO for the one or more UE devices to transmit using one layer and four scrambling IDs.

### Claim 10 (depends on 8)

The apparatus of claim 8, wherein the DCI includes a configuration to support up to rank 4 MU-MIMO with orthogonal Demodulation Reference Signals (DMRS).

### Claim 11 (depends on 8)

The apparatus of claim 8, wherein the DCI includes a configuration to support up to rank 8 MU-MIMO for the one or more UE devices to transmit using two layers using different Demodulation Reference Signals (DMRS) and scrambling ID combinations.

### Claim 12 (depends on 8)

The apparatus of claim 8, wherein the DCI includes a configuration to support up to rank 8 MU-MIMO for the one or more UE devices to transmit using two layers, wherein each layer is mapped to one code word.

### Claim 13 (depends on 8)

The apparatus of claim 8, wherein the DCI includes a configuration to support up to rank 8 MU-MIMO for the one or more UE devices to transmit using two layers such that the Demodulation Reference Signals (DMRS) are orthogonal for up to four of the UE devices.

### Claim 14 (depends on 8)

The apparatus of claim 8, wherein the DCI includes a configuration for one UE device to have rank 3 or 4 to be paired with another UE device to have rank 3 or 4, respectively.