# US 11,121,837 B2 · User equipment and method of SRS transmission

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- Number: US 11,121,837 B2
- Document ID: US11121837B2
- Status: Granted
- Kind: B2
- Application number: 16/483,314
- Filed: 2018-02-02
- Published: 2019-12-12
- Granted: 2021-09-14
- Earliest claimed: 2017-02-03
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.; DOCOMO Innovations, Inc.
- Inventors: Yuichi Kakishima; Ryosuke Osawa; Kazuaki Takeda; Satoshi Nagata
- Web page: https://patentgrep.com/patent/US11121837B2

## CPC

- 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)}
- H04B 7/0417: Feedback systems
- H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

A user equipment (UE) is disclosed including a receiver that receives Sounding Reference Symbol (SRS) configuration information that indicates a first resource used for transmission of a predetermined reference signal from a base station (BS). The UE includes a transmitter that transmits an SRS using a second resource that is the first resource. The UE further includes a processor that determines a precoder applied to the SRS based on the predetermined reference signal. The transmitter transmits the SRS precoded using the determined precoder. The predetermined reference signal is a Channel State Information Reference Signal (CSI-RS), an SRS, or a Synchronization Signal Block (SSB)/Physical Broadcast Channel (PBCH).

## Claims

### Claim 1

A terminal comprising:
a receiver that receives information indicating a relationship between a Sounding Reference Symbol (SRS) and a Synchronization Signal Block (SSB)/Physical Broadcast Channel (PBCH); and
a processor that selects, based on the information, a beam that is used in the receiving of the SSB/PBCH as a beam for use in transmission of the SRS.

### Claim 2 (depends on 1)

The terminal according to claim 1,
wherein the processor determines a precoder applied to the SRS based on the SSB/PBCH, and
wherein the terminal further comprises a transmitter that transmits the SRS precoded using the precoder determined by the processor.

### Claim 3 (depends on 1)

The terminal according to claim 1, wherein the receiver receives the information using higher layer signaling.

### Claim 4

A radio communication method for a terminal comprising:
receiving information indicating a relationship between a Sounding Reference Symbol (SRS) and a Synchronization Signal Block (SSB)/Physical Broadcast Channel (PBCH); and
selecting, based on the information, a beam that is used in the receiving of the SSB/PBCH as a beam for use in transmission of the SRS.

### Claim 5 (depends on 4)

The radio communication method according to claim 4, further comprising:
determining a precoder applied to the SRS based on the SSB/PBCH, and
transmitting the SRS precoded using the determined precoder.

### Claim 6 (depends on 4)

The radio communication method according to claim 4, wherein the information is received using higher layer signaling.

### Claim 7

A base station comprising:
a transmitter that transmits information indicating a relationship between a Sounding Reference Symbol (SRS) and a Synchronization Signal Block (SSB)/Physical Broadcast Channel (PBCH); and
a receiver that receives the SRS transmitted from a terminal,
wherein a beam, used in the receiving of the SSB/PBCH, is selected in the terminal, based on the information, as a beam for use in transmission of the SRS.

### Claim 8

A system comprising a base station and a terminal, wherein
the base station comprises:
a transmitter that transmits information indicating a relationship between a Sounding Reference Symbol (SRS) and a Synchronization Signal Block (SSB)/Physical Broadcast Channel (PBCH), and
the terminal comprises:
a receiver that receives the information; and
a processor that selects, based on the information, a beam that is used in the receiving of the SSB/PBCH as a beam for use in transmission of the SRS.