# US 11,310,830 B2 · Terminal, radio base station, radio communication method, and system for a physical uplink shared channel and sounding reference signal

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- Number: US 11,310,830 B2
- Document ID: US11310830B2
- Status: Granted
- Kind: B2
- Application number: 16/890,516
- Filed: 2020-06-02
- Published: 2020-09-17
- Granted: 2022-04-19
- Earliest claimed: 2016-02-04
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuki Takeda; Satoshi Nagata; Hiroki Harada
- Web page: https://patentgrep.com/patent/US11310830B2

## CPC

- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 25/0228: {with direct estimation from sounding signals}
- H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)}
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A terminal is disclosed that includes a transmitter that transmits a physical uplink shared channel (PUSCH) and a measurement reference signal (sounding reference signal (SRS)) and a processor that performs sensing and controls to contiguously transmit the PUSCH and the SRS after the sensing. In other aspects, a radio communication method and a base station are disclosed.

## Claims

### Claim 1

A terminal comprising:
a receiver that receives a downlink (DL) signal;
a transmitter that transmits a physical uplink shared channel (PUSCH) and a sounding reference signal (SRS); and
a processor that controls the transmitter to transmit each of the PUSCH and the SRS in accordance with a downlink control information (DCI) included in the DL signal, the SRS being triggered by the DCI,
wherein the processor allocates the PUSCH to symbols in an uplink (UL) subframe except the last one or more symbols in the UL subframe, and transmits the PUSCH following transmission of the SRS, based on the DCI included in the DL signal, and
wherein the processor performs listening prior to the transmission of the SRS.

### Claim 2 (depends on 1)

The terminal according to claim 1, wherein a time required for the listening varies depending on a value of a contention window size.

### Claim 3

A radio base station comprising:
a transmitter that transmits, to a terminal, a downlink (DL) signal including downlink control information (DCI) to trigger each of transmission of a physical uplink shared channel (PUSCH) and transmission of a sounding reference signal (SRS); and
a receiver that receives the PUSCH and the SRS that are transmitted from the terminal in accordance with the DCI such that the PUSCH is received after the SRS,
wherein the transmitter transmits, to the terminal, the DL signal including the DCI to allocate the PUSCH to symbols in an uplink (UL) subframe except the last one or more symbols in the UL subframe.

### Claim 4

A radio communication method performed by a terminal, comprising:
receiving a downlink (DL) signal;
transmitting a physical uplink shared channel (PUSCH) and a sounding reference signal, SRS; and
controlling to transmit each of the PUSCH and the SRS in accordance with a downlink control information (DCI) included in the DL signal, the SRS being triggered by the DCI,
wherein the terminal allocates the PUSCH to symbols in an uplink (UL) subframe except the last one or more symbols in the UL subframe, and transmits the PUSCH following transmission of the SRS, based on the DCI included in the DL signal, and
wherein the terminal performs listening prior to the transmission of the SRS.

### Claim 5 (depends on 1, 3)

A system comprising a terminal according to claim 1 and a radio base station according to claim 3.