# US 9,520,978 B2 · Apparatus, system, and method for signaling a quantity of antenna ports in a wireless communication system

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- Number: US 9,520,978 B2
- Document ID: US9520978B2
- Status: Granted
- Kind: B2
- Application number: 14/862,426
- Filed: 2015-09-23
- Published: 2016-01-14
- Granted: 2016-12-13
- Earliest claimed: 2008-12-22
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Mattias Frenne; Branislav Popovic; Jianghua Liu
- Web page: https://patentgrep.com/patent/US9520978B2

## CPC

- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04B 7/06: at the transmitting station
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 5/0023: {Time-frequency-space}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 88/02: Terminal devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A quantity of antenna ports of a transmitting apparatus is signalled in a wireless communication system. The quantity of antenna ports of the transmitting apparatus is encoded into a first type information and a second type information. The first type information is transmitted on a physical broadcast channel (PBCH) and the second type information is transmitted on a physical downlink shared channel (PDSCH). The PDSCH is transmitted on at least one antenna port indicated by the first type information.

## Claims

### Claim 1

A method of signaling a quantity of antenna ports of a transmitting apparatus in a wireless communication system, the method comprising:
transmitting, by the transmitting apparatus, a first type information on a physical broadcast channel (PBCH), wherein the first type information indicates a first number of an antenna port of the transmitting apparatus corresponding to a cell-specific reference signal (CRS); and
transmitting, by the transmitting apparatus, a second type information on a physical downlink shared channel (PDSCH), wherein the second type information indicates a second number of an antenna port of the transmitting apparatus corresponding to a channel state information reference signal (CSI-RS), wherein the PDSCH is transmitted on an antenna port indicated by the first type information.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first type information is detectable to both a long term evolution user equipment (LTE UE) and a long term evolution-advanced user equipment (LTE-A UE).

### Claim 3 (depends on 2)

The method of claim 2, wherein the second type information is only detectable to the LTE-A UE.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first type information indicates the first number of the antenna port of the transmitting apparatus corresponding to the CRS being one, two, or four.

### Claim 5 (depends on 1)

The method of claim 1, wherein the second type information indicates the second number of the antenna port of the transmitting apparatus corresponding to the CSI-RS being zero, two, four, or eight.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first type information is used for demodulating a control channel.

### Claim 7 (depends on 1)

The method of claim 1, wherein the second type information is used for channel measurement.

### Claim 8 (depends on 1)

The method of claim 1, wherein the transmitting apparatus supports more than four layers transmission.

### Claim 9 (depends on 1)

The method of claim 1, wherein the transmitting apparatus is a base station.

### Claim 10

A transmitting apparatus, comprising at least one processor configured to:
transmit a first type information on a physical broadcast channel (PBCH), wherein the first type information indicates a first number of an antenna port of the transmitting apparatus corresponding to a cell-specific reference signal (CRS); and
transmit a second type information on a physical downlink shared channel (PDSCH), wherein the second type information indicates a second number of an antenna port of the transmitting apparatus corresponding to a channel state information reference signal (CSI-RS), the PDSCH configured to be transmitted on an antenna port indicated by the first type information.

### Claim 11 (depends on 10)

The transmitting apparatus of claim 10, wherein the first type information is detectable to both a long term evolution user equipment (LTE UE) and a long term evolution-advanced user equipment (LTE-A UE).

### Claim 12 (depends on 11)

The transmitting apparatus of claim 11, wherein the second type information is only detectable to the LTE-A UE.

### Claim 13 (depends on 10)

The transmitting apparatus of claim 10, wherein the first type information indicates the first number of the antenna port of the transmitting apparatus corresponding to the CRS being one, two, or four.

### Claim 14 (depends on 10)

The transmitting apparatus of claim 10, wherein the second type information indicates the second number of the antenna port of the transmitting apparatus corresponding to the CSI-RS being zero, two, four, or eight.

### Claim 15 (depends on 10)

The transmitting apparatus of claim 10, wherein the first type information is configured to be used for demodulating a control channel.

### Claim 16 (depends on 10)

The transmitting apparatus of claim 10, wherein the second type information is configured to be used for channel measurement.

### Claim 17 (depends on 10)

The transmitting apparatus of claim 10, wherein the transmitting apparatus supports more than four layers transmission.

### Claim 18 (depends on 10)

The transmitting apparatus of claim 10, wherein the transmitting apparatus is a base station.

### Claim 19

A wireless communication system, comprising a transmitting apparatus and a receiving apparatus, wherein the transmitting apparatus comprises at least one processor configured to:
transmit a first type information to the receiving apparatus on a physical broadcast channel (PBCH), wherein the first type information indicates a first number an antenna port of the transmitting apparatus corresponding to a cell-specific reference signal (CRS); and
transmit a second type information to the receiving apparatus on a physical downlink shared channel (PDSCH), wherein the second type information indicates a second number of an antenna port of the transmitting apparatus corresponding to a channel state information reference signal (CSI-RS), the PDSCH being transmitted on an antenna port indicated by the first type information.

### Claim 20 (depends on 19)

The system of claim 19, wherein the first type information indicates the first number of the antenna port of the transmitting apparatus corresponding to the CRS being one, two, or four.

### Claim 21 (depends on 20)

The system of claim 20, wherein the second type information indicates the second number of the antenna port of the transmitting apparatus corresponding to the CSI-RS being zero, two, four, or eight.