KR20100084465A - Method and apparatus for transmitting/receiving data in wireless communication network - Google Patents

Method and apparatus for transmitting/receiving data in wireless communication network Download PDF

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KR20100084465A
KR20100084465A KR1020090132151A KR20090132151A KR20100084465A KR 20100084465 A KR20100084465 A KR 20100084465A KR 1020090132151 A KR1020090132151 A KR 1020090132151A KR 20090132151 A KR20090132151 A KR 20090132151A KR 20100084465 A KR20100084465 A KR 20100084465A
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South Korea
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message
access point
data
station
cts
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KR1020090132151A
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Korean (ko)
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신선경
이석규
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한국전자통신연구원
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Priority to US12/688,368 priority Critical patent/US20100182987A1/en
Publication of KR20100084465A publication Critical patent/KR20100084465A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE: A method and an apparatus for transmitting/receiving data in a wireless communication network are provided to have compatibility with an existing system without changing the structure of an existing control frame. CONSTITUTION: An AP(Access Point) simultaneously transmits an RTS(Request To Send) message including transmission order information of a CTS(Clear To Send) message to stations(204). The stations receive the CTS message transmitted according to the transmission order information(206). The AP simultaneously transmits the data to the stations(208). The AP broadcasts a request message of a training signal. The stations simultaneously receive the training signal transmitted in response to the request message.

Description

METHOD AND APPARATUS FOR TRANSMITTING / RECEIVING DATA IN WIRELESS COMMUNICATION NETWORK}

The present invention relates to a method and apparatus for transmitting and receiving data, and more particularly, to a method and apparatus for transmitting and receiving data in a wireless communication network.

The present invention is derived from a study performed as part of the IEEE 802.11 VHT ultra-high speed wireless LAN wireless transmission research project of the Ministry of Knowledge Economy. [Task Management Number: 2009-F-046-01, Assignment Name: IEEE 802.11 VHT Ultra High Speed Wireless LAN Wireless Transmission]

Medium Access Control (MAC) of a wireless LAN defined by IEEE 802.11 is an association of one access point (AP) and one or more stations (STAs). Basic Service Set (hereinafter referred to as 'BSS') is supported. In such a BSS environment, one access point and one station form a single channel to transmit data. Therefore, in recent years, multi-channel MAC technology has been studied to enable one access point and a plurality of stations to simultaneously communicate in order to increase data transmission rate.

A method that is being studied to support multiple channels in an ad hoc network environment includes a dedicated control channel approach for allocating a separate channel for transmission of a control frame, a time axis. There is a channel hopping approach for transmitting a control frame by moving a channel without overlapping and a time division approach for separately transmitting data and a control signal on a time axis. As the studies conducted in the ad hoc network environment use a plurality of channels, that is, a plurality of frequency bands, most of them cannot be applied to a WLAN system using a time division duplex method in a predetermined frequency band. .

In a BSS wireless network environment, in order to support multiple channels, a method of changing a structure of a control frame and a method of repeatedly transmitting and receiving RTS / CTS as many stations as desired to communicate with an access point are used.

However, there is a problem that the method of changing the structure of the control frame is not compatible with the existing system. For example, the method of adding additional address ranges to represent multiple transmit / receive addresses in the RTS / CTS frame is not compatible with the existing system and has a disadvantage of increasing the size of the control frame. The method of simultaneously transmitting control frames has a disadvantage in that compatibility with an existing system is not only problematic, but additional processing is required for processing an orthogonal signal. In addition, the method of repeatedly using the RTS / CTS by the number of stations to communicate has a problem in that the transmission efficiency of data is reduced since the interval for transmitting and receiving the control frame becomes longer as the number of stations to communicate increases.

Accordingly, an object of the present invention is to provide a method and apparatus for transmitting and receiving data that is compatible with an existing system and forms multiple channels by not changing the structure of an existing control frame.

Another object of the present invention is to provide a data transmission / reception method and apparatus for improving throughput of a system by efficiently using a control frame transmission / reception interval.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention, which are not mentioned above, can be understood by the following description, and more clearly by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to achieve the above object, a data transmission method according to an embodiment of the present invention is a method in which an access point transmits data to a plurality of stations in a wireless communication network, the method comprising: (a) transmitting a CTS (Clear To Send) message; Simultaneously transmitting a Request To Send (RTS) message including sequence information to the station, (b) receiving the Clear To Send (CTS) message transmitted by the station according to the transmission sequence information, and (c) Simultaneously transmitting the data to the station that transmitted the CTS message.

In a method of receiving data according to an embodiment of the present invention, in a method in which a station receives data from an access point in a wireless communication network, (a) clear to send transmitted by the access point applying beamforming; Receiving a Request To Send (RTS) message including transmission order information of the message; (b) transmitting the CTS message to the access point according to the transmission order information; and (c) transmitting from the access point. Receiving the data to which the beamforming has been applied.

In an apparatus for transmitting data to a plurality of stations in a wireless communication network, a data transmitting apparatus according to an embodiment of the present invention may include a request to send (RTS) message including transmission order information of a clear to send (CTS) message. And a transmitting unit for transmitting to the station at the same time and a receiving unit for receiving the clear to send (CTS) message transmitted by the station according to the transmission order information, wherein the transmitting unit is configured to transmit the data to the station transmitting the CTS message. Simultaneously.

In an apparatus for receiving data from an access point in a wireless communication network, a data receiving apparatus according to an embodiment of the present invention is a transmission order of a clear to send (CTS) message transmitted by the access point by applying beamforming. A receiving unit for receiving a Request To Send (RTS) message including information and a transmitting unit for transmitting the CTS message to the access point according to the transmission order information, wherein the receiving unit is the beam transmitted from the access point. Receive the data to which the shaping has been applied.

According to the present invention, data can be simultaneously transmitted and received between one access point and a plurality of stations while being compatible with the existing system by not modifying the existing control frame structure.

In addition, according to the present invention, the throughput of the system can be improved by efficiently using the control frame transmission / reception intervals.

The above objects, features, and advantages will be described in detail with reference to the accompanying drawings, whereby those skilled in the art to which the present invention pertains may easily implement the technical idea of the present invention. In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

The present invention applies a multi-user Multi User Multi Input Multi Output (MIMO) system to support multiple channels in transmitting and receiving data between an access point and a station in a wireless communication network. The present invention is compatible with the existing system by not modifying the structure of the existing control frame, the access point and the station in the wireless communication network, which can improve the throughput of the system by efficiently using the control frame transmission and reception intervals The present invention relates to a method and an apparatus for simultaneously transmitting and receiving data.

1 is a diagram showing the configuration of a wireless communication network according to an embodiment of the present invention.

Referring to FIG. 1, a wireless communication network includes one access point (AP) 110 and one or more stations (STAs). The access point 110 communicates with one or more stations. Hereinafter, the case where the access point 110 transmits data to a plurality of stations 120-1 to 120-N, N> = 2 will be described. Of course, the present invention can be applied even when the access point 110 transmits data to one station.

The access point 110 may have two or more antennas, and each station 120-1 through 120-N, N> = 2 may have one or more antennas. At this time, the access point 110 should have a number of antennas equal to or greater than the total sum of the number of antennas of the plurality of stations 120-1 to 120 -N, N> = 2 communicating with the access point 110. . In Figure 1 the antenna is represented by an inverted triangle shape.

First, a data transmission apparatus for transmitting data to a plurality of stations 120-1 to 120-N, N> = 2 will be described with reference to FIG. The data transmission apparatus may be, for example, the access point 110. The access point 110 transmits and receives a frame determined according to the MAC protocol as shown in FIG. 3 in order to transmit data to the plurality of stations 120-1 to 120 -N, N> = 2.

Referring to the case in which the access point 110 transmits a predetermined frame according to the MAC protocol as shown in FIG. 3, the access point 110 uses each station 120-1 to 120-N, N> = 2 according to the determined MAC protocol. A frame to be transmitted is determined, and the frame determined to be transmitted is encoded in a PHY physical layer and transmitted through an antenna. The frame includes a data frame and a control frame necessary for controlling the transmission of the data frame.

In this case, the access point 110 may simultaneously transmit frames to be transmitted to each station by assigning different antennas to each of the stations 120-1 to 120 -N and N> = 2. Therefore, the data rate is increased compared to a system in which one access point and one station form a single channel to transmit data. For example, if Station 1 (120-1), Station 2 (120-2), and Station 4 (120-4) each have two antennas, the access point 110 may select one of its antennas and one of the antennas. Transmit the desired frame to the station 1 (120-1) through the antenna 2, transmit the desired frame to the station 2 (120-2) through its antennas 3 and 4, and 5 and 6 The antenna can transmit the desired frame to the station 4 (120-4). As a result, each frame may be simultaneously transmitted to three stations 120-1, 120-2, and 120-4.

In addition, the access point 110 may encode a frame for which transmission is determined, precode the channel information for each station, and then transmit the antenna through the antenna. When precoding is performed, a beam is formed between the access point 110 and each station as shown in FIG. 1. That is, the access point 110 may simultaneously transmit frames to be transmitted to each station without interference by using an independent channel formed through a beamforming technique. The access point 110 does not form a channel by forming a beam for a station that will not transmit data, as in the station 3 (120-3) of FIG.

Referring to the case in which the access point 110 receives a frame determined according to the MAC protocol as shown in FIG. 3, the frame transmitted by each of the stations 120-1 to 120 -N, N> = 2 is transmitted to the access point 110. Is received and decoded through an antenna. As described above, the access point 110 is equal to or larger than the total sum of the number of antennas of the plurality of stations 120-1 to 120 -N, N> = 2 communicating with the access point 110. Should have If the access point 110 has a number of antennas smaller than the total sum of the number of antennas of the plurality of stations 120-1 to 120-N, N> = 2, the plurality of stations 120-1 to 120 This is because a case where -N, N> = 2) cannot simultaneously decode a signal to be transmitted.

Next, when the access point 110 transmits data to the plurality of data receiving apparatuses 120-1 to 120-N, N> = 2, the data receiving apparatuses 120-1 to 120-N, which receive the data, N> = 2) will be described with reference to FIG. Each station 120-1 to 120-N, N> = 2 transmits and receives a frame determined according to the MAC protocol as shown in FIG. 3 in order to receive respective data from the access point 110.

Referring to the case where each station 120-1 to 120-N, N> = 2 transmits a frame determined according to the MAC protocol as shown in FIG. 3, each station 120-1 to 120-N, N> = 2 ) Determines a frame to be transmitted to the access point 110 according to the determined MAC protocol, and then encodes the frame whose transmission is determined in the PHY layer and transmits the same through the antenna.

In addition, each station 120-1 to 120 -N, N> = 2 may receive a frame transmitted by the access point 110 through its antenna and then decode it.

Hereinafter, a method of transmitting and receiving data in a wireless communication network according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3. In the embodiment described with reference to FIG. 3, three access points 110 in a WLAN system conforming to the IEEE 802.11 standard consisting of one access point 110 and four stations 120-1, 120-2, 120-3, and 120-4 Data is transmitted to four stations, that is, station 1 (120-1), station 2 (120-2) and station 3 (120-3).

The access point 110 obtains channel information for each station to which data is to be transmitted (202). The channel information is used by the access point 110 to form a beam for each station, as described below.

As an example, referring to FIG. 3, an access point 110 that obtains a data transmission priority through a backoff procedure 302 has all stations associated with it, that is, station 1 ( 120-1), a message requesting transmission of a training sequence to a station 2 (120-2), a station 3 (120-3) and a station 4 (120-4) (TREQ, below) Broadcasts a 'training signal request message' (304).

The stations 120-1, 120-2, 120-3, and 120-4 that have received the training signal request message 304, after a Short InterFrame Space (SIFS) time, transmit a Response Response (TRSP), ie, to the access point 110. The training signal is transmitted simultaneously (306). As described above, the access point 110 may decode the response signal 306 simultaneously transmitted by four stations 120-1, 120-2, 120-3, and 120-4 using a multi-antenna decoding technique. Can be. That is, since the access point 110 has the number of antennas equal to or greater than the total number of antennas of the four stations 120-1, 120-2, 120-3, and 120-4, the four stations 120-1, 120-2, 120- 3, 120-4) may decode the training signals transmitted simultaneously. As described above, the access point 110 may decode the response signals 306 simultaneously received, and estimate channel information about each of the stations 120-1, 120-2, 120-3, and 120-4.

In order to estimate the channel information to be used for beamforming, the present invention broadcasts the training signal request message 304 and simultaneously receives and decodes the response message 306 for the training signal request message, thereby improving efficiency on the time axis. There is a growing advantage.

The access point 110 simultaneously transmits a transmission request message to a plurality of stations to which data is to be transmitted (204). In this case, the access point 110 may simultaneously transmit a transmission request message by forming a beam based on channel information about each station acquired in step 202. The transmission request message is a message indicating that the access point 110 is ready to transmit data, and performs a function of reserving a channel for data transmission.

As an example, referring to FIG. 3, the transmission request message may be a Request To Send (RTS) message (308). Access point 110 simultaneously transmits an RTS1 message to station1 120-1, an RTS2 message to station2 120-2, and an RTS3 message to station3 120-3 (308).

At this time, the access point 110, based on the channel information for each station (120-1,120-2,120-3) estimated from the response signal received in step 306, to each station (120-1,120-2,120-3) Each RTS message (RTS1, RTS2, RTS3) may be simultaneously transmitted by forming an independent beam. The station 4 120-4, which will not transmit the RTS message, does not form a nulling channel by forming a beam.

Also, the access point 110 transmits a clear to send (CTS) message, which is a response message to the RTS message, after each station 120-1, 120-2, 120-3 receives the RTS message (CTS message transmission order information). ) Can be set and transmitted in the RTS message (308). For example, the access point 110 sets the CTS message transmission sequence 1 of the station 1 120-1 to the RTS1 message, and sets the CTS message transmission sequence 3 of the station 2 120-2 to the RTS2. Message, and the CTS message transmission order (2) of station 3 (120-3) can be set in the RTS3 message, so that the RTS1, RTS2, and RTS3 messages can be simultaneously transmitted (308).

The access point 110 sequentially receives a transmission grant message from one or more stations that have received the transmission request message transmitted in step 204 (206). The transmission acknowledgment message is a message indicating that the station is ready to receive data in response to the transmission request message.

As an example, referring to FIG. 3, the transmission grant message may be a clear to send (CTS) message. Each station 120-1, 120-2, and 120-3 receiving the RTS messages RTS1, RTS2, and RTS3 may transmit the CTS messages CTS1, CTS2, and CTS3 to the access point 110 simultaneously, Each CTS message (CTS1, CTS2, CTS3) is sequentially transmitted to the access point 110 without using. Each station 120-1, 120-2, and 120-3 transmits the CTS messages CTS1, CTS2, and CTS3 to the access point 110 according to the CTS message transmission order information set in each of the RTS messages RTS1, RTS2, and RTS3. (310,314,318). For example, as shown in FIG. 3, the first station 1 120-1 transmits a CTS1 message 310, the second station 3 120-3 transmits a CTS3 message 314, and finally Station 2 (120-2) will send a CTS2 message (318).

As described above, the CTS messages CTS1, CTS2, and CTS3 are sequentially transmitted without using a beamforming scheme, so that the station 4 120-4, which does not participate in data transmission and reception, transmits the CTS messages CTS1, CTS2, and CTS3. This is for receiving and updating a Network Allocation Vector (NAV). The network allocation vector (NAV) indicates that the access point 110 or other station has access to the medium for the set time.

For example, in FIG. 3, since station 4 120-4 may receive the CTS1 310 message transmitted by station 1 120-1, after receiving the CTS1 310 message, the network allocation vector ( NAV (CTS1): 312 is set. In this manner, station 4 (120-4) sets the network allocation vector (NAV (CTS3): 316) after receiving the CTS3 314 message, and receives the network allocation vector (NA) after receiving the CTS2 320 message. NAV (CTS2): 320 is set. Thus, station 4 (120-4) does not check whether the medium is used until the value of the network allocation vector becomes zero. In this way, collision can be avoided while the access point 110 transmits data to each of the stations 120-1, 120-2, and 120-3.

The access point 110 sequentially receives the transmission grant message in step 206, and then simultaneously transmits data to the station that has transmitted the transmission grant message (208).

As an example, referring to FIG. 3, when the access point 110 receives all of the CTS messages CTS1, CTS2, and CTS3 from each of the stations 120-1, 120-2, and 120-3, previously determined data. The data Data1, Data2, and Data3 are simultaneously transmitted to the stations 120-1, 120-2, and 120-3 during the transmission interval 334 (322). According to the embodiment of FIG. 3, the access point 110 transmits data 1 to station 1 120-1, data 2 to station 2 120-1, and station 3. Data 3 may be simultaneously transmitted to 120-3.

In this case, the access point 110 forms a beam based on the channel information of each of the stations 120-1, 120-2, and 120-3 obtained in step 306, and transmits each data (Data 1, Data 2, Data 3) to each station 120-. 1, 120-2 and 120-3 may be simultaneously transmitted (322).

The data transmission section 334 may be preset according to a protocol, or the access point 110 and the stations 120-1, 120-2, and 120-3 may exchange and control a control frame in the control section 332. Since each of the data Data1, Data2, and Data3 may have different sizes, the access point 110 may null the data 2 and the data 3 having a smaller size than the data transmission interval 334 to fit the data transmission interval 334. It may transmit data including null data. In another embodiment, stations 120-2 and 120-3 that have received data smaller than the data transmission interval 334 from the access point 110 wait until the data transmission interval 334 is completed, and then The following procedure 324,326,328 may be performed.

When the data transmission interval 334 is completed, the stations 120-1, 120-2, and 120-3 that have received each of the data Data 1, Data 2, and Data 3 perform a data reception confirmation procedure after the SIFS time. In an embodiment, the stations 120-1, 120-2, and 120-3 that receive the data Data1, Data2, and Data3 may transmit an acknowledgment message (ACKnowledge: ACK) according to the CTS transmission order information. That is, when the data transmission interval 334 is completed, the station 1 120-1 transmits an acknowledgment message to the access point 110 after the SIFS time (324). After the SIFS time after the receipt acknowledgment message transmission 324 of the station 1 120-1, the station 3 120-3 transmits an acknowledgment message to the access point 110 (326), and again after the SIFS time, the station 2 120-2 transmits an acknowledgment message to the access point 110 (328). In another embodiment, after the SIFS time after the data transmission interval 334 is completed, each station 120-1, 120-2, 120-3 may simultaneously transmit an acknowledgment message to the access point 110.

4 is a view showing the structure of a control frame according to an embodiment of the present invention. Referring to FIG. 4, the RTS frames 402 defined in the IEEE 802.11 standard are all composed of 10 octets, and include a frame control field (Frame Control: 404), an interval field (Duration: 406), and a reception address (Receiver Address). : RA, 408, a transmitter address (TA, 410), and a frame check sequence (FCS, 412).

The frame control field 404 used for the control of the frame includes the protocol version (414), type (Type: 416), subtype (Subtype: 418), ToDS (To Distribution Service: 420), FromDS (From Distribution Service: 422), MoreFrag (More Fragment: 424), Retry (Retry: 426), Pwr Mgt (Power Management: 428), More Data (430), Protected Frame: 432, and Sequence ( Order: 434).

According to the IEEE 802.11 standard, as shown in Table 1, some values of a type (Type) 416 subfield '11' and a subtype (Subtype: 418) subfield are not defined in the RTS frame. Accordingly, in the present invention, CTS message transmission order information is set using undefined values of the Type (416) subfield and the Subtype (418) subfield. For example, the type (416) subfield may be set to '11' and the subtype (418) subfield may be set to '0001' in the RTS1 message to be transmitted to the station 1 120-1. In the same manner, the type (416) subfield is set to '11' and the subtype (418) subfield is set to '0003' in the RTS2 message to be transmitted to the station 2 (120-2). In the RTS3 message to be transmitted, the type (Type) 416 subfield may be set to '11', and the subtype (418) subfield may be set to '0002'.

Type value
b3 b2 Type
description Subtype value
b7 b6 b5 b4 Subtype description 00 Management 0000 Association request ... ... ... ... 01 Control 0000-0111 Reserved ... ... ... ... 10 Data 0000 Data ... ... ... ... 11 Reserved 0000-1111 Reserved

In the above, the method of transmitting and receiving data in a WLAN system conforming to the IEEE 802.11 standard including one access point and four stations has been described. However, this method can be applied to all types of wireless communication networks performing control frame transmission for transmitting and receiving data. Of course.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention is compatible with the existing system by not modifying the structure of the existing control frame, the access point and the station in the wireless communication network, which can improve the throughput of the system by efficiently using the control frame transmission and reception intervals Provided are a method and an apparatus for simultaneously transmitting and receiving data therebetween.

1 is a diagram showing the configuration of a wireless communication network according to an embodiment of the present invention.

2 is a flowchart illustrating a data transmission / reception method according to an embodiment of the present invention.

3 is a view for explaining a data transmission and reception method according to another embodiment of the present invention.

4 is a view showing the structure of a control frame according to an embodiment of the present invention.

Claims (16)

A method in which an access point transmits data to a plurality of stations in a wireless communication network, (a) simultaneously transmitting a Request To Send (RTS) message including transmission order information of a Clear To Send (CTS) message to the station; (b) receiving the Clear To Send (CTS) message transmitted by the station according to the transmission order information; And (c) simultaneously transmitting the data to the station that transmitted the CTS message. The method of claim 1, (d) broadcasting a request message of a training signal; (e) simultaneously receiving the training signal that the station transmits in response to the request message; And (f) decoding the training signals received at the same time to obtain channel information; Step (a) or step (c) is, And forming a beam using the channel information and simultaneously transmitting the beam to the station. The method of claim 1, In the RTS message, a type subfield in a frame control field is set to '11', and transmission order information of the CTS message is set in a subtype subfield. . The method of claim 1, The data includes null data for adjusting a transmission interval. The method of claim 1, (g) establishing a network allocation vector (NAV) by a station in the wireless communication network upon receiving the CTS message sent by the station according to the transmission order information. The method of claim 1, (h) receiving an acknowledgment (ACK) message, which the station receiving the data transmits according to the transmission order information. A method in which a station receives data from an access point in a wireless communication network, the method comprising: (a) receiving a Request To Send (RTS) message including transmission order information of a Clear To Send (CTS) message transmitted by the access point by applying beamforming; (b) transmitting the CTS message to the access point according to the transmission order information; And (c) receiving the data from which the beamforming has been applied transmitted from the access point. The method of claim 7, wherein (d) receiving a request message of a training signal broadcast by the access point; And (e) transmitting the training signal to the access point, The beamforming is a method of receiving data, wherein the access point uses channel information obtained by decoding the training signal. The method of claim 7, wherein In the RTS message, a type subfield in a frame control field is set to '11', and transmission order information of the CTS message is set in a subtype subfield. . The method of claim 7, wherein (f) transmitting an acknowledgment (ACK) message for the received data to the access point according to the transmission order information. An apparatus for transmitting data to a plurality of stations in a wireless communication network, A transmitter for simultaneously transmitting a request to send (RTS) message including transmission order information of a clear to send (CTS) message to the station; And Receiving unit for receiving the Clear To Send (CTS) message transmitted by the station according to the transmission order information, And the transmitting unit simultaneously transmits the data to the station that has transmitted the CTS message. The method of claim 11, The receiving unit receives the training signal transmitted from the station at the same time, The transmitting unit broadcasts a message requesting the station to transmit the training signal, and simultaneously forms a beam based on the channel information obtained by decoding the received training signal to transmit the RTS message or the data to the station. A data transmission device that transmits simultaneously to the network. The method of claim 11, In the RTS message, a type subfield in a frame control field is set to '11', and a transmission order information of the CTS message is set in a subtype subfield. . An apparatus for receiving data from an access point in a wireless communication network, the apparatus comprising: A receiving unit for receiving a request to send (RTS) message including transmission order information of a clear to send (CTS) message transmitted by the access point by applying beamforming; And A transmitter for transmitting the CTS message to the access point according to the transmission order information; And the receiving unit receives the data to which the beamforming is applied, transmitted from the access point. The method of claim 14, The receiving unit receives a request message of a training signal broadcast by the access point, The transmitting unit transmits the training signal to the access point, The beamforming is a data receiving apparatus, wherein the access point uses channel information obtained by decoding the training signal. The method of claim 14, In the RTS message, a type subfield in a frame control field is set to '11', and a transmission order information of the CTS message is set in a subtype subfield. .
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WO2014025476A1 (en) * 2012-08-10 2014-02-13 Intel Corporation Methods and arrangements for beamforming reports in wireless networks
WO2014123357A1 (en) * 2013-02-05 2014-08-14 엘지전자 주식회사 Method and apparatus for transmitting downlink in wireless communication system
WO2014123358A1 (en) * 2013-02-06 2014-08-14 엘지전자 주식회사 Method and apparatus for transmitting uplink in wireless communication system
KR20150065140A (en) * 2013-12-04 2015-06-12 한국전자통신연구원 Method for channel sounding and scheduling for interference alignment in wireless local area network
US10993231B2 (en) 2017-05-18 2021-04-27 Electronics And Telecommunications Research Institute Method and device for operation based on multiple channels in sensor network

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Publication number Priority date Publication date Assignee Title
WO2014025476A1 (en) * 2012-08-10 2014-02-13 Intel Corporation Methods and arrangements for beamforming reports in wireless networks
US9743303B2 (en) 2012-08-10 2017-08-22 Intel Corporation Methods and arrangements for beamforming reports in wireless networks
WO2014123357A1 (en) * 2013-02-05 2014-08-14 엘지전자 주식회사 Method and apparatus for transmitting downlink in wireless communication system
US10342045B2 (en) 2013-02-05 2019-07-02 Lg Electronics Inc. Method and apparatus for transmitting downlink in wireless communication system
US10887915B2 (en) 2013-02-05 2021-01-05 Lg Electronics Inc. Method and apparatus for transmitting downlink in wireless communication system
WO2014123358A1 (en) * 2013-02-06 2014-08-14 엘지전자 주식회사 Method and apparatus for transmitting uplink in wireless communication system
KR20150115786A (en) * 2013-02-06 2015-10-14 엘지전자 주식회사 Method and apparatus for transmitting uplink in wireless communication system
US9844037B2 (en) 2013-02-06 2017-12-12 Lg Electronics Inc. Method and apparatus for transmitting uplink in wireless communication system
KR20150065140A (en) * 2013-12-04 2015-06-12 한국전자통신연구원 Method for channel sounding and scheduling for interference alignment in wireless local area network
US10993231B2 (en) 2017-05-18 2021-04-27 Electronics And Telecommunications Research Institute Method and device for operation based on multiple channels in sensor network

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