# US 2019/0174484 A1 · Method for transmitting a response request frame and a response frame in a multi-user based wireless communication system

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- Number: US 2019/0174484 A1
- Document ID: US20190174484A1
- Status: Published application
- Kind: A1
- Application number: 16/253,292
- Filed: 2019-01-22
- Published: 2019-06-06
- Earliest claimed: 2009-11-24
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Yun Joo KIM; Jee Yon CHOI; Sok-Kyu LEE
- Web page: https://patentgrep.com/patent/US20190174484A1

## CPC

- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 74/002: {Transmission of channel access control information}
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04W 28/04: Error control
- H04W 74/004: {in the uplink, i.e. towards network}
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- 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

The present invention relates to a method for efficient transmission of a request frame such as an RTS/CTS frame and a response frame in response to the request frame in a multi-user based wireless communication system. The method of the present invention comprises: a process where wireless terminals transmit a response frame at their own response frame transmission time through a request frame that contains information about a plurality of wireless terminals and information about the response frame transmission time of the respective wireless terminals; a process where the respective wireless terminals transmit a response frame according to a token scheme such that the response frame is transmitted to a final access point; and a process where only a representative wireless terminal selected depending on a given wireless environment receives the response frame.

## Claims

### Claim 1

A method of transmitting a response frame in a wireless communication system, the method comprising:
receiving, by a first station, from an access point, a request frame for requesting channel information to the first station and a second station, the request frame including time information, a first user field identifying the first station and a second user field identifying the second station; and
transmitting, by the first station, to an access point, a response frame as a response to the request frame,
wherein the time information is determined based on a sum of an estimated time required for the first station to transmit the response frame plus at least one Short Interframe Space (SIFS), and
wherein the request frame sequentially includes the time information, the first user field and the second user field.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first user field includes an association identifier (AID) of the first station and the second user field includes an AID of the second station.

### Claim 3 (depends on 1)

The method of claim 1, wherein the time information includes a duration field.

### Claim 4

A device for transmitting a response frame in a wireless local area network, the device comprising a processor configured to:
receive, from an access point, a request frame for requesting channel information to the first station and a second station, the request frame including time information, a first user field identifying the device and a second user field identifying the second station; and
transmit, to an access point, a response frame as a response to the request frame,
wherein the time information is determined based on a sum of an estimated time required for the device to transmit the response frame plus at least one Short Interframe Space (SIFS), and
wherein the request frame sequentially includes the time information, the first user field and the second user field.

### Claim 5 (depends on 4)

The device of claim 4, wherein the first user field includes an association identifier (AID) of the device and the second user field includes an AID of the second station.

### Claim 6 (depends on 4)

The device of claim 4, wherein the time information includes a duration field.