# US 2021/0243733 A1 · Receiver device, transmitter device, reception method, and transmission method

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- Number: US 2021/0243733 A1
- Document ID: US20210243733A1
- Status: Published application
- Kind: A1
- Application number: 17/153,654
- Filed: 2021-01-20
- Published: 2021-08-05
- Earliest claimed: 2012-02-16
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Ayako Horiuchi; Hidetoshi Suzuki; Akihiko Nishio; Masayuki Hoshino
- Web page: https://patentgrep.com/patent/US20210243733A1

## CPC

- H04B 7/0417: Feedback systems
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)}
- H04B 7/0671: {using different delays between antennas}
- H04B 7/068: {using space frequency diversity (space-frequency coding H04L1/0606)}
- H04B 7/0689: {using different transmission schemes, at least one of them being a diversity transmission scheme}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 25/0204: {of multiple channels}
- H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length}
- H04L 27/2649: {Demodulators}
- H04W 16/28: using beam steering
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A communication apparatus includes circuitry and a transmitter. The circuitry maps a precoded downlink control signal to one of a plurality of mapping candidates. The precoded downlink control signal is prepared using a first precoding for single-antenna port transmission with a single antenna port in localized allocation mode. The precoded downlink control signal is prepared using a second precoding for multi-antenna ports transmission with two antenna ports in distributed allocation mode. The plurality of mapping candidates is comprised of a plurality of aggregation levels, and one or more of the aggregation levels that is higher than a boundary among the plurality of aggregation levels is associated with only the multi-antenna ports transmission, the boundary being determined based on signaling indicated from the base station apparatus. The transmitter transmits the precoded downlink control signal.

## Claims

### Claim 1

A communication apparatus comprising:
circuitry, which, in operation, maps a precoded downlink control signal to one of a plurality of mapping candidates,
wherein the precoded downlink control signal is prepared using a first precoding for single-antenna port transmission with a single antenna port in localized allocation mode,
wherein the precoded downlink control signal is prepared using a second precoding for multi-antenna ports transmission with two antenna ports in distributed allocation mode, and
wherein the plurality of mapping candidates is comprised of a plurality of aggregation levels, and one or more of the aggregation levels that is higher than a boundary among the plurality of aggregation levels is associated with only the multi-antenna ports transmission, the boundary being determined based on signaling indicated from the base station apparatus; and
a transmitter, which, in operation, transmits the precoded downlink control signal.

### Claim 2 (depends on 1)

The communication apparatus according to claim 1, wherein the second precoding for the multi-antenna ports transmission is a precoding for transmission diversity.

### Claim 3 (depends on 1)

The communication apparatus according to claim 1, wherein three or more antenna ports provide several subsets of antenna ports, and one of the several subsets of antenna ports is used in the distributed allocation mode.

### Claim 4 (depends on 1)

The communication apparatus according to claim 1, wherein resources in the localized allocation mode are localized in a frequency domain, and resources in the distributed allocation mode are distributed in the frequency domain.

### Claim 5 (depends on 1)

The communication apparatus according to claim 1, wherein a plurality of first aggregation levels used in the distributed allocation mode at least partially overlaps with a plurality of second aggregation levels used in the localized allocation mode and includes at least one more aggregation level that is higher than any one of the second aggregation levels.

### Claim 6 (depends on 1)

The communication apparatus according to claim 1, comprising at least one input node, which, in operation, inputs data.

### Claim 7 (depends on 1)

The communication apparatus according to claim 1, comprising at least one output node, which, in operation, outputs data.

### Claim 8

A communication method comprising:
mapping a precoded downlink control signal to one of a plurality of mapping candidates,
wherein the precoded downlink control signal is prepared using a first precoding for single-antenna port transmission with a single antenna port in localized allocation mode,
wherein the precoded downlink control signal is prepared using a second precoding for multi-antenna ports transmission with two antenna ports in distributed allocation mode, and
wherein the plurality of mapping candidates is comprised of a plurality of aggregation levels, and one or more of the aggregation levels that is higher than a boundary among the plurality of aggregation levels is associated with only the multi-antenna ports transmission, the boundary being determined based on signaling indicated from the base station apparatus; and
transmitting the precoded downlink control signal.

### Claim 9 (depends on 8)

The communication method according to claim 8, wherein the second precoding for the multi-antenna ports transmission is a precoding for transmission diversity.

### Claim 10 (depends on 8)

The communication method according to claim 8, wherein three or more antenna ports provide several subsets of antenna ports, and one of the several subsets of antenna ports is used in the distributed allocation mode.

### Claim 11 (depends on 8)

The communication method according to claim 8, wherein resources in the localized allocation mode are localized in a frequency domain, and resources in the distributed allocation mode are distributed in the frequency domain.

### Claim 12 (depends on 8)

The communication method according to claim 8, wherein a plurality of first aggregation levels used in the distributed allocation mode at least partially overlaps with a plurality of second aggregation levels used in the localized allocation mode and includes at least one more aggregation level that is higher than any one of the second aggregation levels.

### Claim 13 (depends on 8)

The communication method according to claim 8, comprising at least one input node, which, in operation, inputs data.

### Claim 14 (depends on 8)

The communication method according to claim 8, comprising at least one output node, which, in operation, outputs data.