# US 2019/0173535 A1 · System and Method for Multi-User Multiple Input Multiple Output Communications

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- Number: US 2019/0173535 A1
- Document ID: US20190173535A1
- Status: Published application
- Kind: A1
- Application number: 16/256,139
- Filed: 2019-01-24
- Published: 2019-06-06
- Earliest claimed: 2014-11-21
- Assignees: Futurewei Technologies, Inc.
- Applicants: Futurewei Technologies, Inc.
- Inventors: Zhengxiang Ma
- Web page: https://patentgrep.com/patent/US20190173535A1

## CPC

- H04B 7/0452: Multi-user MIMO systems
- H04B 7/0469: {taking special antenna structures, e.g. cross polarized antennas into account}
- H04B 7/0473: {taking constraints in layer or codeword to antenna mapping into account}
- H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]}
- H04L 5/0023: {Time-frequency-space}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for operating a communications controller in a wireless communications system includes scheduling a pair of user equipments (UE) located in different ones of a plurality of split beams using an appropriate code pair that produces the plurality of split beams for multi-user multiple-input multiple output (MU-MIMO) mode transmission, and transmitting data packets to the pair of UEs in accordance with the appropriate code pair.

## Claims

### Claim 1

(canceled)

### Claim 2

A method for configuring a 3-sector wireless communications system, the method comprising:
generating a plurality of split beams covering a first sector of the 3-sector communications system;
mapping the plurality of split beams to baseband antenna ports to equalize reference signal coverage between the baseband antenna ports; and
transmitting one or more signals over one or more of the plurality of split beams in accordance with the mapping between the plurality of split beams and the baseband antenna ports.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
generating a widebeam from a subset of the plurality of split beams; and
transmitting a signal over the widebeam.

### Claim 4 (depends on 2)

The method of claim 2, wherein at least a portion of the mapping is implemented in a radio frequency (RF) domain after a power amplifier to direct power to a particular split beam.

### Claim 5 (depends on 2)

The method of claim 2, wherein at least a portion of the mapping is implemented in a radio frequency (RF) domain prior to a power amplifier.

### Claim 6 (depends on 2)

The method of claim 2, wherein at least a portion of the mapping is implemented in a digital domain.

### Claim 7 (depends on 2)

The method of claim 2, wherein the plurality of split beams consists of two split beams.

### Claim 8

An evolved NodeB (eNB) in a wireless communications system, the eNB comprising:
a processor; and
a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
generate a plurality of split beams covering a first sector of the 3-sector communications system;
map the plurality of split beams to baseband antenna ports to equalize reference signal coverage between the baseband antenna ports; and
transmit one or more signals over one or more of the plurality of split beams in accordance with the mapping between the plurality of split beams and the baseband antenna ports.

### Claim 9 (depends on 8)

The eNB of claim 8, wherein the programming further includes instructions to:
generate a widebeam from a subset of the plurality of split beams; and
transmit a signal over the widebeam.

### Claim 10 (depends on 8)

The eNB of claim 8, wherein at least a portion of the mapping is implemented in a radio frequency (RF) domain after a power amplifier to direct power to a particular split beam.

### Claim 11 (depends on 8)

The eNB of claim 8, wherein at least a portion of the mapping is implemented in a radio frequency (RF) domain prior to a power amplifier.

### Claim 12 (depends on 8)

The eNB of claim 8, wherein at least a portion of the mapping is implemented in a digital domain.

### Claim 13 (depends on 8)

The eNB of claim 8, wherein the plurality of split beams consists of two split beams.

### Claim 14

A non-transitory computer readable storage medium storing programming for execution by a processor, the programming including instructions to:
generate a plurality of split beams covering a first sector of the 3-sector communications system;
map the plurality of split beams to baseband antenna ports to equalize reference signal coverage between the baseband antenna ports; and
transmit one or more signals over one or more of the plurality of split beams in accordance with the mapping between the plurality of split beams and the baseband antenna ports.

### Claim 15 (depends on 14)

The non-transitory computer readable storage medium of claim 14, wherein the programming further includes instructions to:
generate a widebeam from a subset of the plurality of split beams; and
transmit a signal over the widebeam.

### Claim 16 (depends on 14)

The eNB of claim 14, wherein at least a portion of the mapping is implemented in a radio frequency (RF) domain after a power amplifier to direct power to a particular split beam.

### Claim 17 (depends on 14)

The eNB of claim 14, wherein at least a portion of the mapping is implemented in a radio frequency (RF) domain prior to a power amplifier.

### Claim 18 (depends on 14)

The eNB of claim 14, wherein at least a portion of the mapping is implemented in a digital domain.

### Claim 19 (depends on 14)

The eNB of claim 14, wherein the plurality of split beams consists of two split beams.