User terminal and radio communication method

Patent metadata

Field	Value
Publication number	US-11881968-B2
Application number	US-201716958510-A
Country	US
Kind code	B2
Filing date	Dec 27, 2017
Priority date	Dec 27, 2017
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

A user terminal according to one aspect of the present disclosure includes: a transmitting section that transmits an uplink shared channel by applying a precoder; and a control section that specifies a number of ports used to determine the precoder when a Sounding Reference Signal (SRS) resource is not configured. According to one aspect of the present disclosure, even when an SRS resource is not configured, it is possible to appropriately determine a precoder of a UL signal.

First claim

The invention claimed is:

1. A terminal comprising:
a processor that determines a number of ports used to transmit a Physical Uplink Shared Channel (PUSCH) is only one based on a downlink control information scheduling the PUSCH, in response to a Sounding Reference Signal (SRS) resource not being configured by a higher layer signaling; and
a transmitter that transmits the PUSCH,
wherein the downlink control information does not include an SRS resource index.

2. The terminal according to claim 1 , wherein the transmitter transmits the PUSCH by applying a precoder when the SRS resource is not configured by the higher layer signaling.

3. A radio communication method of a terminal comprising:
determining a number of ports used to transmit a Physical Uplink Shared Channel (PUSCH) is only one based on a downlink control information scheduling the PUSCH, in response to a Sounding Reference Signal (SRS) resource not being configured by a higher layer signaling; and
transmitting the PUSCH,
wherein the downlink control information does not include an SRS resource index.

4. A base station comprising:
a transmitter that transmits a higher layer signaling without a configuration of a Sounding Reference Signal (SRS) resource to a terminal; and
a receiver that receives a Physical Uplink Shared Channel (PUSCH) transmitted using only one port from the terminal based on a downlink control information scheduling the PUSCH, in response to the SRS resource not being configured by the higher layer signaling,
wherein the downlink control information does not include an SRS resource index.

5. A system comprising:
a terminal comprising:
a processor that determines a number of ports used to transmit a Physical Uplink Shared Channel (PUSCH) is only one based on a downlink control information scheduling the PUSCH in response to a Sounding Reference Signal (SRS) resource not being configured by a higher layer signaling;
a transmitter of the terminal that transmits the PUSCH,
wherein the downlink control information does not include an SRS resource index; and

a base station comprising:
a transmitter of the base station that transmits the higher layer signaling without a configuration of the SRS resource to the terminal; and
a receiver that receives the PUSCH transmitted using the only one port from the terminal based on the downlink control information scheduling the PUSCH.

Assignees

• Ntt Docomo Inc

Inventors

• Osawa Ryosuke
• Kakishima Yuichi

Classifications

• H04L25/0226 Primary

  sounding signals per se · CPC title

• H04B7/0482

  Adaptive codebooks · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title