# US 2018/0323948 A1 · User terminal, base station, and radio communication method

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- Number: US 2018/0323948 A1
- Document ID: US20180323948A1
- Status: Published application
- Kind: A1
- Application number: 16/032,339
- Filed: 2018-07-11
- Published: 2018-11-08
- Earliest claimed: 2013-09-26
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuki Takeda; Satoshi Nagata; Hiroyuki Ishii
- Web page: https://patentgrep.com/patent/US20180323948A1

## CPC

- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 72/04: Wireless resource allocation
- H04W 72/044: based on the type of the allocated resource
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- 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 uplink transmission is carried out adequately even when CA is executed by applying different duplex modes between multiple cells. A user terminal that receives downlink control information (DCI) including Downlink Assignment Index (DAI) in a frequency division duplex (FDD) cell and controls, based on the DAI, transmission of a transmission acknowledgement signal for a downlink shared channel that is scheduled to the FDD cell by the DCI.

## Claims

### Claim 1

A user terminal comprising:
a receiving section that receives downlink control information (DCI) including Downlink Assignment Index (DAI) in a frequency division duplex (FDD) cell; and
a control section that controls, based on the DAI, transmission of a transmission acknowledgement signal for a downlink shared channel that is scheduled to the FDD cell by the DCI.

### Claim 2 (depends on 1)

The user terminal according to claim 1, wherein the control section controls transmission of the transmission acknowledgement signal using an uplink control channel of the FDD cell.

### Claim 3 (depends on 1)

The user terminal according to claim 1, wherein the control section controls transmission of the transmission acknowledgement signal to which A/N bundling is applied based on the DAI.

### Claim 4

A radio base station that transmits downlink control information (DCI) including Downlink Assignment Index (DAI) in a frequency division duplex (FDD) cell; and
a control section that controls, based on the DAI, reception of a transmission acknowledgement signal for a downlink shared channel that is scheduled to the FDD cell by the DCI.

### Claim 5 (depends on 2)

The user terminal according to claim 2, wherein the control section controls transmission of the transmission acknowledgement signal to which A/N bundling is applied based on the DAI.