# US 12,603,736 B2 · Communication device and communication method

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- Number: US 12,603,736 B2
- Document ID: US12603736B2
- Status: Granted
- Kind: B2
- Application number: 18/260,581
- Filed: 2021-07-09
- Published: 2024-03-07
- Granted: 2026-04-14
- Earliest claimed: 2021-01-15
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Jun Minotani; Yoshio Urabe; Takashi Iwai; Tomofumi Takata
- Web page: https://patentgrep.com/patent/US12603736B2

## 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)}
- H04L 25/0226: {sounding signals per se}
- H04W 72/20: Control channels or signalling for resource management
- H04L 25/0204: {of multiple channels}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- 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 improves channel estimation accuracy in wireless communication. This communication device comprises: a control circuit that sets, to a control signal, information relating to an additional reference signal for each destination device; and a transmission circuit that transmits the control signal.

## Claims

### Claim 1

A communication apparatus, comprising:
control circuitry, which, in operation, sets, to an extremely high throughput physical layer convergence procedure protocol data unit (EHT PPDU), information on an extra reference signal for each destination apparatus; and
transmission circuitry, which, in operation, transmits the EHT PPDU,
wherein,
the information is included in a common field of an EHT signal (EHT-SIG) as an extra subfield of a universal signal (U-SIG), and
the control circuitry sets a number of EHT long training fields (EHT-LTFs) in the EHT PPDU greater than a number of EHT-LTFs specified based on a number of spatial streams.

### Claim 2 (depends on 1)

The communication apparatus according to claim 1, wherein the information on the extra reference signal is information indicating presence or absence of the extra reference signal.

### Claim 3 (depends on 1)

The communication apparatus according to claim 1, wherein the information on the extra reference signal is information indicating a number of the extra reference signals.

### Claim 4 (depends on 1)

The communication apparatus according to claim 1, wherein the information on the extra reference signal is information indicating a multiple of an original number of the reference signals.

### Claim 5 (depends on 1)

The communication apparatus according to claim 1, wherein the control circuitry switches a configuration of the EHT PPDU in accordance with presence or absence of the extra reference signal.

### Claim 6 (depends on 5)

The communication apparatus according to claim 5, wherein, in a case of the presence of the extra reference signal, the control circuitry sets a bitmap to common information for a plurality of the destination apparatuses in the EHT PPDU, the bitmap indicating the presence or absence of the extra reference signal for each of the plurality of destination apparatuses.

### Claim 7 (depends on 1)

The communication apparatus according to claim 1, wherein the control circuitry sets, to individual information for each of a plurality of the destination apparatuses in the EHT PPDU, assignment information of a row component of a mapping matrix that is added to the extra reference signal.

### Claim 8

A communication method, comprising:
configuring, by a communication apparatus, to an extremely high throughput physical layer convergence procedure protocol data unit (EHT PPDU), information on an extra reference signal for each destination apparatus; and
transmitting, by the communication apparatus, the EHT PPDU,
wherein,
the information is included in a common field of an EHT signal (EHT-SIG) as an extra subfield of a universal signal (U-SIG), and
a number of EHT long training fields (EHT-LTFs) in the EHT PPDU is set greater than a number of EHT-LTEs specified based on a number of spatial streams.

### Claim 9

An integrated circuit, comprising:
control circuitry, which, in operation, sets, to an extremely high throughput physical layer convergence procedure protocol data unit (EHT PPDU), information on an extra reference signal for each destination apparatus; and
transmission circuitry, which, in operation, controls transmission of the EHT PPDU,
wherein,
the information is included in a common field of an EHT signal (EHT-SIG) as an extra subfield of a universal signal (U-SIG), and
a number of EHT long training fields (EHT-LTFs) in the EHT PPDU is set greater than a number of EHT-LTFs specified based on a number of spatial streams.