# US 2018/0323949 A1 · Radio base station, user terminal and radio communication method

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- Number: US 2018/0323949 A1
- Document ID: US20180323949A1
- Status: Published application
- Kind: A1
- Application number: 16/039,485
- Filed: 2018-07-19
- Published: 2018-11-08
- Earliest claimed: 2013-04-12
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Satoshi Nagata; Chunyi Wang; Xiaolin Hou; Atsushi Harada
- Web page: https://patentgrep.com/patent/US20180323949A1

## CPC

- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/12: Wireless traffic scheduling
- H04W 72/20: Control channels or signalling for resource management
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- 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

In order to provide feedback information of a transmission acknowledgement signal or the like appropriately even in change in DL/UL configuration in TDD, a radio base station that communicates with a user terminal by time division duplex that is capable of controlling change in DL/UL configuration is provided. The user terminal includes a receiver that receives information to change a DL/UL configuration in time division duplex, receives higher layer signaling including first information about HARQ feedback timing, and receives downlink control information including second information about the HARQ feedback timing. The user terminal determines the HARQ feedback timing for a downlink shared channel based on the first information and the second information.

## Claims

### Claim 1

A user terminal comprising:
a receiver that receives information to change a DL/UL configuration in time division duplex, receives higher layer signaling including first information about HARQ feedback timing, and receives downlink control information including second information about the HARQ feedback timing; and
a processor that determines the HARQ feedback timing for a downlink shared channel based on the first information and the second information.