# US 2019/0320344 A1 · User terminal and wireless communication method

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- Number: US 2019/0320344 A1
- Document ID: US20190320344A1
- Status: Published application
- Kind: A1
- Application number: 16/341,218
- Filed: 2017-08-02
- Published: 2019-10-17
- Earliest claimed: 2016-10-13
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Yuki Matsumura; Kazuki Takeda; Satoshi Nagata
- Web page: https://patentgrep.com/patent/US20190320344A1

## CPC

- H04W 28/04: Error control
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0082: {at predetermined intervals}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A user terminal (20) is provided with: an error detection unit (205) that detects the presence/absence of an error concerning a downlink data signal and generates ACK or NACK which are error detection results; and a mapping unit (207) that maps a transmission signal on a first frequency resource in one symbol and corresponding to ACK when the error detection result is ACK, and maps a transmission signal on a second frequency resource different from the first frequency resource in the same symbol corresponding to NACK when the error detection result is NACK.

## Claims

### Claim 1

A user terminal, comprising:
an error detector that detects presence or absence of an error with respect to a downlink data signal, and generates an ACK or NACK which is an error detection result; and
a mapper that maps, when the error detection result is ACK, a transmission signal to a first frequency resource in one symbol associated with the ACK, and that maps, when the error detection result is NACK, the transmission signal to a second frequency resource which is different from the first frequency resource in a same symbol and which is associated with the NACK.

### Claim 2 (depends on 1)

The user terminal according to claim 1, wherein
in a resource block defined by a plurality of subcarriers and one symbol,
the first frequency resource is one of an odd-numbered subcarrier or an even-numbered subcarrier among the plurality of the subcarriers, and
the second frequency resource is another one of the odd-numbered subcarrier or the even-numbered subcarrier among the plurality of the subcarriers.

### Claim 3 (depends on 1)

The user terminal according to claim 1, wherein
in a resource block defined by a plurality of subcarriers and one symbol,
the first frequency resource is, among the plurality of the subcarriers, a subcarrier of a high frequency side or a low frequency side including a subcarrier serving as a reference, and
the second frequency resource is, among the plurality of the subcarriers, a subcarrier other than the subcarrier included in the first frequency resource.

### Claim 4 (depends on 3)

The user terminal according to claim 3, wherein
a number of the subcarriers included in the first frequency resource is less than a number of the subcarriers included in the second frequency resource.

### Claim 5 (depends on 1)

The user terminal according to claim 1, wherein
in each of the first frequency resource and the second frequency resource, different frequency resources are associated with a plurality of the user terminals.

### Claim 6

A radio communication method, comprising:
detecting presence or absence of an error with respect to a downlink data signal, and generating ACK or NACK as an error detection result; and
mapping, when the error detection result is ACK, a transmission signal to a first frequency resource in one symbol associated with the ACK, and mapping, when the error detection result is NACK, the transmission signal to a second frequency resource which is different from the first frequency resource in a same symbol and which is associated with the NACK.