# US 10,873,979 B2 · User terminal and radio communication method

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- Number: US 10,873,979 B2
- Document ID: US10873979B2
- Status: Granted
- Kind: B2
- Application number: 16/300,386
- Filed: 2017-05-11
- Published: 2019-04-11
- Granted: 2020-12-22
- Earliest claimed: 2016-05-12
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuaki Takeda; Kazuki Takeda; Yousuke Sano; Satoshi Nagata
- Web page: https://patentgrep.com/patent/US10873979B2

## CPC

- H04W 74/085: {collision avoidance}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 72/04: Wireless resource allocation
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- 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
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W 74/0891: {for synchronized access}
- H04W 76/14: Direct-mode setup
- 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 to reduce the latency due to collisions in UL transmission when contention-based UL data transmission is employed. A user terminal communicates using a second transmission time interval (TTI), having a shorter TTI duration than a first TTI, and this user terminal has a transmission section that transmits multiple UL data without a UL grant from a radio base station, and a control section that controls allocation of the multiple UL data individually, and the control section applies frequency hopping to allocate the multiple UL data to resources of different second TTIs.

## Claims

### Claim 1

A terminal that communicates using a shorter time interval than a subframe, comprising:
a transmission section that transmits multiple UL data without a UL grant from a radio base station; and
a control section that controls allocation of the multiple UL data,
wherein the control section allocates the multiple UL data to resources of different time intervals by applying frequency hopping.

### Claim 2 (depends on 1)

The terminal according to claim 1, further comprising a receiving section that receives DL data transmitted from the radio base station,
wherein the receiving section receives the DL data that is allocated to resources of the time interval by frequency hopping.

### Claim 3 (depends on 2)

The terminal according to claim 2, wherein the receiving section determines a frequency hopping pattern of the DL data based on downlink control information and/or higher layer signaling transmitted from the radio base station.

### Claim 4

A radio communication method for a terminal that communicates using a shorter time interval than a subframe, the radio communication method comprising:
transmitting multiple UL data without a UL grant from a radio base station; and
controlling allocation of the multiple UL data,
wherein the terminal allocates the multiple UL data to resources of different time intervals by applying frequency hopping.