# US 2020/0288501 A1 · User terminal and radio communication method

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- Number: US 2020/0288501 A1
- Document ID: US20200288501A1
- Status: Published application
- Kind: A1
- Application number: 16/646,082
- Filed: 2017-09-11
- Published: 2020-09-10
- Earliest claimed: 2017-09-11
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuaki Takeda; Kazuki Takeda; Satoshi Nagata
- Web page: https://patentgrep.com/patent/US20200288501A1

## CPC

- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04W 72/12: Wireless traffic scheduling
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- 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 to properly transmit a scheduling request, a random access preamble, and a sounding reference signal when single-UL communication is applied to a non-stand-alone radio communication system. A user terminal controls the transmission of at least one of the scheduling request, the random access preamble and the sounding reference signal in the first RAT based at least on UL/DL configurations.

## Claims

### Claim 1

A user terminal comprising:
a transmission section that transmits a first uplink signal (UL) of a first radio access technology (RAT) and a second UL signal of a second RAT, at different times, the first RAT controlling a timing for transmitting delivery acknowledgment information in frequency division duplexing (FDD) and/or a timing for scheduling UL data, based on a UL/DL configuration to be used in time division duplexing (TDD); and
a control section that controls transmission of at least one of a scheduling request (SR), a random access preamble and a sounding reference signal (SRS) in the first RAT based on at least a UL transmission timing specified by the UL/DL configuration.

### Claim 2 (depends on 1)

The user terminal according to claim 1, wherein the control section controls the timing for transmitting the scheduling request based on a user terminal-specific time offset and an SR configuration, in which the timing for transmitting the scheduling request is set forth.

### Claim 3 (depends on 1)

The user terminal according to claim 1, wherein the control section controls the timing for transmitting the random access preamble based on a random access channel configuration to be configured for FDD.

### Claim 4 (depends on 1)

The user terminal according to claim 1, wherein the control section controls the timing for transmitting the random access preamble based on a random access channel configuration to be configured for TDD.

### Claim 5 (depends on 1)

The user terminal according to claim 1, wherein the control section controls the timing for transmitting the sounding reference signal based on an SRS configuration to be configured for FDD.

### Claim 6

A radio communication method comprising the steps of:
transmitting a first uplink signal (UL) of a first radio access technology (RAT) and a second UL signal of a second RAT, at different times, the first RAT controlling a timing for transmitting delivery acknowledgment information in frequency division duplexing (FDD) and/or a timing for scheduling UL data, based on a UL/DL configuration to be used in time division duplexing (TDD); and
controlling transmission of at least one of a scheduling request (SR), a random access preamble and a sounding reference signal (SRS) in the first RAT based on at least a UL transmission timing specified by the UL/DL configuration.

### Claim 7 (depends on 2)

The user terminal according to claim 2, wherein the control section controls the timing for transmitting the random access preamble based on a random access channel configuration to be configured for FDD.

### Claim 8 (depends on 2)

The user terminal according to claim 2, wherein the control section controls the timing for transmitting the random access preamble based on a random access channel configuration to be configured for TDD.

### Claim 9 (depends on 2)

The user terminal according to claim 2, wherein the control section controls the timing for transmitting the sounding reference signal based on an SRS configuration to be configured for FDD.

### Claim 10 (depends on 3)

The user terminal according to claim 3, wherein the control section controls the timing for transmitting the sounding reference signal based on an SRS configuration to be configured for FDD.

### Claim 11 (depends on 4)

The user terminal according to claim 4, wherein the control section controls the timing for transmitting the sounding reference signal based on an SRS configuration to be configured for FDD.