# US 2018/0323938 A1 · User terminal, radio base station and radio communication method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2018/0323938 A1
- Document ID: US20180323938A1
- Status: Published application
- Kind: A1
- Application number: 15/772,915
- Filed: 2016-11-02
- Published: 2018-11-08
- Earliest claimed: 2015-11-05
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuki Takeda; Satoshi Nagata; Lihui Wang; Liu Liu; Huiling Jiang
- Web page: https://patentgrep.com/patent/US20180323938A1

## CPC

- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04W 28/04: Error control
- H04W 52/545: {modifying TPC bits in special situations}
- H04W 72/04: Wireless resource allocation
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- 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 it is possible to feed back HARQ-ACKs adequately even when a plurality of component carriers are configured in a radio communication system. The present invention provides a receiving section that receives DL signals transmitted from a plurality of component carriers (CCs), and a control section that controls transmission of an HARQ-ACK in response to a received DL signal based on a counter DAI included in the downlink control information, and the counter DAI is configured to three or more bits in predetermined downlink control information. Also, the counter DAI can be comprised of varying numbers of bits depending on the number of CCs configured in the user terminal or the number of CCs where listening is applied to DL transmission.

## Claims

### Claim at position 1

-10. (canceled)

### Claim 11

A user terminal, comprising:
a receiving section that receives DL signals transmitted from a plurality of cells; and
a control section that controls transmission of HARQ-ACK in response to the DL signals received;
wherein an uplink control channel resource used for the transmission of HARQ-ACK is determined by a bit value of TPC command included in downlink control information and an uplink control channel format.

### Claim 12 (depends on 11)

The user terminal according to claim 11, wherein a number of bits of the TPC command is common among different uplink control channel formats.

### Claim 13 (depends on 11)

The user terminal according to claim 11, wherein the uplink control channel format is switched in accordance with a number of bits of uplink control information including at least one of the HARQ-ACK, a scheduling request and channel state information.

### Claim 14

A user terminal comprising:
a receiving section that receives DL signals transmitted from a plurality of cells; and
a control section that controls transmission of HARQ-ACK in response to the DL signals received, based on a counter DAI included in downlink control information;
wherein the counter DAI is configured with a number of bits that is different depending on a number of cells configured with the user terminal.