# US 2018/0027591 A1 · Wireless communication system, wireless communication method, wireless lan access point, and wireless lan station

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- Number: US 2018/0027591 A1
- Document ID: US20180027591A1
- Status: Published application
- Kind: A1
- Application number: 15/547,405
- Filed: 2016-02-23
- Published: 2018-01-25
- Earliest claimed: 2015-02-24
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Shoko SHINOHARA; Yasuhiko INOUE; Akira KISHIDA; Riichi KUDO; Masato MIZOGUCHI
- Web page: https://patentgrep.com/patent/US20180027591A1

## CPC

- H04W 74/0816: with collision avoidance
- H04B 7/0452: Multi-user MIMO systems
- H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/12: Wireless traffic scheduling
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/002: {Transmission of channel access control information}
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/06: using polling
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- 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)
- H04B: TRANSMISSION

## Abstract

A predetermined STA includes a station information collection unit collecting from the STA itself and other STAs station information used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission, and a simultaneous-transmission request unit knowing occurrence of a QoS data frame based on the station information and transmitting a request frame requesting the simultaneous transmission to an AP. The AP includes a station information collection unit; a simultaneous-transmission determination unit selecting a combination of the STAs performing the simultaneous transmission based on the station information by reception of the request frame; and a trigger transmission unit transmitting to each of the STAs performing the simultaneous transmission a trigger frame instructing to performs the simultaneous transmission and including information necessary for controlling the simultaneous transmission. Each of the STAs designated by the trigger frame is configured to simultaneously transmit the wireless frames to the AP.

## Claims

### Claim 1

A wireless communication system in which one wireless LAN access point (which is hereinafter referred to as an “AP”) and a plurality of wireless LAN stations (each of which is hereinafter referred to as an “STA”) are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of STAs to the AP in a multiple access scheme, wherein:
the AP includes:
a station information collection unit that collects from the plurality of STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission;
a simultaneous-transmission determination unit that selects a combination of STAs performing the simultaneous transmission based on the station information; and
a trigger transmission unit that transmits to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission, and
each of STAs that is designated by the trigger frame is configured to simultaneously transmit the wireless frame to the AP.

### Claim 2

A wireless communication system in which one wireless LAN access point (which is hereinafter referred to as an “AP”) and a plurality of wireless LAN stations (each of which is hereinafter referred to as an “STA”) are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of STAs to the AP in a multiple access scheme, wherein:
a predetermined STA among the plurality of STAs includes:
a station information collection unit that collects from the STA itself and other STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission; and
a simultaneous-transmission request unit that knows occurrence of a Quality of Service (QoS) data frame based on the station information and that transmits a request frame requesting the simultaneous transmission to the AP, and
the AP includes:
a station information collection unit that collects from the plurality of STAs the station information which is used for the selection of the STAs performing the simultaneous transmission and for the control of the simultaneous transmission;
a simultaneous-transmission determination unit that selects a combination of the STAs performing the simultaneous transmission based on the station information by reception of the request frame that is transmitted by the predetermined STA; and
a trigger transmission unit that transmits to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission, and
each of STAs that is designated by the trigger frame is configured to simultaneously transmit the wireless frame to the AP.

### Claim 3 (depends on 1)

The wireless communication system according to claim 1, wherein
in a case when individual CSMA/CA control is performed on each of the wireless frame destined for the STA and the trigger frame destined for the plurality of STAs performing the simultaneous transmission, the AP includes an access control unit that
sets a parameter of CSMA/CA control at which one of transmission-waiting frames having a greater number and transmission-waiting data having a larger amount easily acquires a channel access right, and
transmits one of the wireless frame and the trigger fame that acquired the channel access right by performing individual CSMA/CA control.

### Claim 4 (depends on 1)

The wireless communication system according to claim 1, wherein
in a case when common CSMA/CA control is performed on each of the wireless frame destined for the STA and the trigger frame destined for the plurality of STAs performing the simultaneous transmission, the AP includes an access control unit that
selects one of the wireless frame and the trigger frame having one of a greater number of transmission-waiting frames and a larger amount of transmission-waiting data, and
transmits one of the wireless frame and the trigger frame being selected that acquired the channel access right by performing the common CSMA/CA control.

### Claim 5 (depends on 1)

The wireless communication system according to claim 1, wherein:
the station information collection unit is configured to collect traffic information of the STA as the station information; and
the simultaneous-transmission determination unit is configured to determine or predict the presence or absence of the wireless frame transmitted from the STA to the AP based on the traffic information to be used for the selection of the combination of STAs performing the simultaneous transmission.

### Claim 6 (depends on 1)

The wireless communication system according to claim 1, wherein:
the station information collection unit is configured to collect propagation characteristic information of the STA as the station information; and
the simultaneous-transmission determination unit is configured to compare data transmission efficiency of the simultaneous transmission when performed in the combination of STAs with data transmission efficiency of a transmission when performed by a single STA based on the propagation characteristic information being collected, and to select the combination of STAs as the combination of STAs performing the simultaneous transmission when the data transmission efficiency of the simultaneous transmission is higher.

### Claim 7 (depends on 1)

The wireless communication system according to claim 1, wherein
the trigger transmission unit includes a modulation method when performing the simultaneous transmission and penalty information for decreasing a coding rate in the trigger frame.

### Claim 8 (depends on 1)

The wireless communication system according to claim 1, wherein:
the simultaneous-transmission determination unit is configured to transmit an announcement frame indicating that the simultaneous transmission has become possible to the STAs performing the simultaneous transmission, to make the STAs which received the announcement frame to acquire a channel access right for performing the simultaneous transmission, and to reselect the combination of STAs performing the simultaneous transmission based on the station information according to a request frame transmitted from the STA which acquired the channel access right; and
the STAs which received the announcement frame are configured to acquire the channel access right for performing the simultaneous transmission and to transmit the request frame to the AP.

### Claim 9 (depends on 2)

The wireless communication system according to claim 2, wherein
the simultaneous-transmission request unit of the predetermined STA is configured to acquire a channel access right for performing the simultaneous transmission before transmitting the request frame to the AP.

### Claim 10

A wireless communication method in which one wireless LAN access point (which is hereinafter referred to as an “AP”) and a plurality of wireless LAN stations (each of which is hereinafter referred to as an “STA”) are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of STAs to the AP in a multiple access scheme, wherein:
the AP includes:
a first step collecting from the plurality of STAs station information which is used for selection of STAs performing the simultaneous transmission and for control of the simultaneous transmission;
a second step of selecting a combination of STAs performing the simultaneous transmission based on the station information; and
a third step of transmitting to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission, and
each of STAs that is designated by the trigger frame simultaneously transmits the wireless frame to the AP.

### Claim 11

A wireless communication method in which one wireless LAN access point (which is hereinafter referred to as an “AP”) and a plurality of wireless LAN stations (each of which is hereinafter referred to as an “STA”) are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of STAs to the AP in a multiple access scheme, wherein:
a predetermined STA among the plurality of STAs includes:
a first step collecting from the STA itself and other STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission; and
a second step knowing occurrence of a Quality of Service (QoS) data frame based on the station information and transmitting a request frame requesting the simultaneous transmission to the AP, and
the AP includes:
a first step collecting from the plurality of STAs the station information which is used for the selection of the STAs performing the simultaneous transmission and for the control of the simultaneous transmission;
a second step selecting a combination of the STAs performing the simultaneous transmission based on the station information by reception of the request frame that is transmitted from the predetermined STA; and
a third step transmitting to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission, and
each of STAs that is designated by the trigger frame simultaneously transmits the wireless frame to the AP.

### Claim 12 (depends on 10)

The wireless communication method according to claim 10, wherein
in a case when individual CSMA/CA control is performed on each of the wireless frame destined for the STA and the trigger frame destined for the plurality of STAs performing the simultaneous transmission, the AP
sets a parameter of CSMA/CA control at which one of transmission-waiting frames having a greater number and transmission-waiting data having a larger amount easily acquires a channel access right, and
transmits one of the wireless frame and the trigger frame that acquired the channel access right by performing individual CSMA/CA control.

### Claim 13 (depends on 10)

The wireless communication method according to claim 10, wherein
in a case when common CSMA/CA control is performed on each of the wireless frame destined for the STA and the trigger frame destined for the plurality of STAs performing the simultaneous transmission, the AP
selects one of the wireless frame and the trigger frame having one of a greater number of transmission-waiting frames and a larger amount of transmission-waiting data, and
transmits one of the wireless frame and the trigger frame being selected that acquired the channel access right by performing the common CSMA/CA control.

### Claim 14 (depends on 10)

The wireless communication method according to claim 10, wherein:
in the first step, traffic information of the STA is collected as the station information; and
in the second step that is performed in the AP, the presence or absence of the wireless frame transmitted from the STA to the AP is determined or predicted based on the traffic information to be used for the selection of the combination of STAs performing the simultaneous transmission.

### Claim 15 (depends on 10)

The wireless communication method according to claim 10, wherein:
in the first step, propagation characteristic information of the STA is collected as the station information; and
in the second step that is performed in the AP, data transmission efficiency of the simultaneous transmission when performed in the combination of STAs and data transmission efficiency of transmission when performed by a single STA are compared based on the propagation characteristic information being collected, and the combination of STAs is selected as the combination of STAs performing the simultaneous transmission when the data transmission efficiency of the simultaneous transmission is higher.

### Claim 16 (depends on 10)

The wireless communication method according to claim 10, wherein
in the third step, a modulation method when performing the simultaneous transmission and penalty information for decreasing a coding rate are included in the trigger frame.

### Claim 17 (depends on 10)

The wireless communication method according to claim 10, wherein:
in the second step that is performed in the AP, an announcement frame indicating that the simultaneous transmission has become possible is transmitted to the STAs performing the simultaneous transmission, the STAs which received the announcement frame are made to acquire a channel access right for performing the simultaneous transmission, and the combination of STAs performing the simultaneous transmission based on the station information is reselected according to a request frame transmitted from the STA which acquired the channel access right; and
the STAs which received the announcement frame acquire the channel access right for performing the simultaneous transmission and transmit the request frame to the AP.

### Claim 18 (depends on 11)

The wireless communication method according to claim 11, wherein
in the second step that is performed in the predetermined STA, a channel access right for performing the simultaneous transmission is acquired before transmitting the request frame to the AP.

### Claim 19

A wireless LAN access point in a wireless communication system in which one wireless LAN access point and a plurality of wireless LAN stations (each of which is hereinafter referred to as an “STA”) are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of STAs to the wireless LAN access point in a multiple access scheme, the wireless LAN access point comprising:
a station information collection unit that collects from the plurality of STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission;
a simultaneous-transmission determination unit that selects a combination of STAs performing the simultaneous transmission based on the station information; and
a trigger transmission unit that transmits to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission.

### Claim 20 (depends on 19)

The wireless LAN access point according to claim 19, further comprising:
in a case when individual CSMA/CA control is performed on each of the wireless frame destined for the STA and the trigger frame destined for the plurality of STAs performing the simultaneous transmission, an access control unit that
sets a parameter of CSMA/CA control at which one of transmission-waiting frames having a greater number and transmission-waiting data having a larger amount easily acquires a channel access right, and
transmits one of the wireless frame and the trigger fame that acquired the channel access right by performing individual CSMA/CA control.

### Claim 21 (depends on 19)

The wireless LAN access point according to claim 19, further comprising:
in a case when common CSMA/CA control is performed on each of the wireless frame destined for the STA and the trigger frame destined for the plurality of STAs performing the simultaneous transmission, an access control unit that
selects one of the wireless frame and the trigger frame having one of a greater number of transmission-waiting frames and a larger amount of transmission-waiting data, and
transmits one of the wireless frame and the trigger frame being selected that acquired the channel access right by performing the common CSMA/CA control.

### Claim 22

A wireless LAN station in a wireless communication system in which one wireless LAN access point (which is hereinafter referred to as an “AP”) and a plurality of wireless LAN stations are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of wireless LAN stations to the AP in a multiple access scheme, the wireless LAN station comprising:
a station information collection unit that collects from a wireless LAN station itself and other wireless LAN stations station information which is used for selection of wireless LAN stations performing simultaneous transmission and for control of the simultaneous transmission; and
a simultaneous-transmission request unit that knows occurrence of a Quality of Service (QoS) data frame by the station information and transmits a request frame requesting the simultaneous transmission to the AP.