# US 2019/0357248 A1 · User terminal and radio communication method

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- Number: US 2019/0357248 A1
- Document ID: US20190357248A1
- Status: Published application
- Kind: A1
- Application number: 16/482,591
- Filed: 2018-02-01
- Published: 2019-11-21
- Earliest claimed: 2017-02-01
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuki Takeda; Satoshi Nagata; Lihui Wang; Xiaolin Hou; Huiling Jiang
- Web page: https://patentgrep.com/patent/US20190357248A1

## CPC

- H04L 5/0041: {Frequency-non-contiguous}
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04L 27/2607: {Cyclic extensions}
- H04W 72/04: Wireless resource allocation
- H04W 72/12: Wireless traffic scheduling
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- 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

The present invention is designed so that, even when a demodulation reference signal for an uplink data channel is multiplexed in a short TTI, this demodulation reference signal can be transmitted adequately. A user terminal according to one aspect of the present invention has a receiving section that receives information about the number of combs that are supported, and a control section that controls transmission of a demodulation reference signal for an uplink data channel in a second transmission time interval (TTI), which is shorter than a first TTI, and the control section maps the demodulation reference signal to a comb-shaped resource set, and maps the uplink data channel to a frequency resource of a bandwidth associated with the number of combs supported.

## Claims

### Claim at position 1

-6. (canceled)

### Claim 7

A terminal comprising:
a processor that maps a demodulation reference signal for an uplink shared channel to a set of equally spaced multiple subcarriers based on information of the demodulation reference signal; and
a transmitter that transmits the demodulation reference signal.

### Claim 8 (depends on 7)

The terminal according to claim 7, wherein the information of the demodulation reference signal is a cyclic shift field included in a downlink control information for scheduling the uplink shared channel.

### Claim 9 (depends on 7)

The terminal according to claim 7, wherein the demodulation reference signal is a demodulation reference signal for the uplink shared channel in a Transmission Time Interval (TTI) shorter than a subframe.

### Claim 10 (depends on 8)

The terminal according to claim 8, wherein the demodulation reference signal is a demodulation reference signal for the uplink shared channel in a Transmission Time Interval (TTI) shorter than a subframe.

### Claim 11 (depends on 7)

The terminal according to claim 7, wherein the processor applies transmission power control to the demodulation reference signal, which is different from transmission power control applied to a demodulation reference signal for an uplink shared channel that is not mapped to the set of equally spaced multiple subcarriers.

### Claim 12 (depends on 8)

The terminal according to claim 8, wherein the processor applies transmission power control to the demodulation reference signal, which is different from transmission power control applied to a demodulation reference signal for an uplink shared channel that is not mapped to the set of equally spaced multiple subcarriers.

### Claim 13 (depends on 9)

The terminal according to claim 9, wherein the processor applies transmission power control to the demodulation reference signal, which is different from transmission power control applied to a demodulation reference signal for an uplink shared channel that is not mapped to the set of equally spaced multiple subcarriers.

### Claim 14

A radio communication method for a terminal, comprising:
mapping a demodulation reference signal for an uplink shared channel to a set of equally spaced multiple subcarriers based on information of the demodulation reference signal; and
transmitting the demodulation reference signal.