KR101859602B1 - Apparatus and Method for Exchanging Data Frame Adaptively in Wireless Lan System - Google Patents

Apparatus and Method for Exchanging Data Frame Adaptively in Wireless Lan System Download PDF

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Publication number
KR101859602B1
KR101859602B1 KR1020170058932A KR20170058932A KR101859602B1 KR 101859602 B1 KR101859602 B1 KR 101859602B1 KR 1020170058932 A KR1020170058932 A KR 1020170058932A KR 20170058932 A KR20170058932 A KR 20170058932A KR 101859602 B1 KR101859602 B1 KR 101859602B1
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South Korea
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mode setting
value
setting parameter
exchange
data frame
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KR1020170058932A
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Korean (ko)
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김태준
박원배
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충북대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

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

Abstract

An apparatus and a method for adaptively exchanging data frames in a wireless LAN system are disclosed. According to an aspect of the present invention, an objective is to provide an apparatus and a method for adaptively selecting a mode of exchanging a data frame according to an environment, in order to minimize loss and overhead due to collision that may occur during the exchange of the data frame. The apparatus includes a communication mode setting part; a control part; and a radio communication part.

Description

[0001] Apparatus and method for adaptively exchanging data frames in a wireless LAN system [

The present embodiment relates to an apparatus and method for adaptively exchanging data frames according to a situation in a wireless LAN system.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

Unlike other wireless communication networks, in a wireless LAN system of IEEE 802.11, since a plurality of terminals share the same channel in communicating with one access point (AP) There is a possibility of collision between data streams. Conventional wireless LAN systems have used CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) to avoid the risk of collision between data streams that are always present. The CSMA / CA technique is a technique in which a UE detects a carrier before transmitting a data frame, confirms whether there is another UE occupying the channel, and then transmits a data frame to avoid collision between data streams as much as possible . To this end, a specific UE checks whether another wireless medium exists before it transmits a data frame, and determines whether the channel is empty. If it is determined that the channel is empty, it waits for a predetermined time (IFS: Inter Frame Space) and then transmits a data frame when the channel is empty. However, even if the CSMA / CA scheme is used, there is a possibility of collision when two or more UEs transmit data frames at the same time.

A technique designed to prevent this problem is a Request to Send (RTS) / Clear to Send (CTS) exchange scheme. A certain terminal transmits an RTS frame, which is relatively much smaller than a data frame, to the access point before attempting to occupy the channel. When a specific terminal receives a CTS frame from an access point and succeeds in exclusive occupation of a channel, a specific terminal transmits a data frame, and if not, transmits an RTS frame again. As described above, since the data frame collision is prevented in advance by using the exchange of the RTS / CTS frame, the loss due to the collision of the data frame is greatly reduced, thereby further improving the performance.

However, even when the number of terminals to be connected to the access point is not large, a loss may occur in case of using the RTS / CTS exchange scheme. For example, if the number of terminals to be connected to the access point is not large and there is little concern of loss of data frames due to collision between data streams, if the RTS / CTS exchange scheme is used, the RTS / There is a problem that the CTS overhead becomes large and the efficiency becomes low.

Therefore, there is a need for a method of exchanging data frames between a terminal and an access point using an appropriate communication method depending on the situation.

An object of the present invention is to provide an apparatus and method for adaptively selecting a method of exchanging data frames according to environments in order to minimize loss and overhead due to collisions that may occur during exchange of data frames have.

According to an aspect of the present invention, there is provided a method of adaptively exchanging data frames in a wireless LAN system, the method comprising: a setting step of setting an initial value of a mode setting parameter according to whether a predetermined condition is satisfied; An adjustment step of adjusting the value of the mode setting parameter according to whether exchange of a data frame is possible or not and an initial value of the mode setting parameter or a value of a mode setting parameter adjusted in the adjusting process exceeds a preset reference value, And determining whether to use a Request-To-Send or CTS (Clear-To-Send) frame exchange scheme.

According to another aspect of the present invention, there is provided a transmission apparatus for adaptively exchanging data frames in a wireless LAN system, the transmission apparatus including an initial value of a mode setting parameter according to whether a predetermined condition is satisfied, The communication method is set according to whether the initial value of the mode setting parameter or the value of the mode setting parameter adjusted in the adjusting process exceeds a preset reference value by adjusting the value of the mode setting parameter according to whether or not the frame can be exchanged. (RTS) or a CTS (Clear) according to the control of the control unit, and a control unit for controlling the communication mode setting unit -To-Send ") frame, and a wireless communication unit It provides Im transport.

As described above, according to one aspect of the present embodiment, by providing an apparatus and method for adaptively selecting a method of exchanging data frames according to an environment, it is possible to reduce a loss due to a collision that may occur during data frame exchange, Can be minimized.

1 is a diagram illustrating a wireless LAN system according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.
3 is a diagram illustrating a configuration of a communication mode setting unit according to an embodiment of the present invention.
4 is a flowchart illustrating an operation method of a terminal according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, throughout the specification, it is to be understood that when an element is referred to as being "comprising" or "comprising", it should be understood that it does not exclude other elements, it means. In addition, '... Quot ;, " module ", and " module " refer to a unit that processes at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.

1 is a diagram illustrating a wireless LAN system according to an embodiment of the present invention.

Referring to FIG. 1, a wireless LAN system 100 according to an exemplary embodiment of the present invention includes an access point 110, terminals 120, 122 and 124, and an Internet network 130.

An access point (AP) 110 is an apparatus that connects the Internet network 130 and the terminals 120, 122, and 124 to allow the terminals 120, 122, and 124 to use the wireless network. The access point 110 has public service identification information and accesses one or more terminals 120, 122, and 124 using public service identification information. The access point 110 is connected to the Internet network 230 so that the terminals 120, 122 and 124 connected to the access point 110 can be connected to the Internet network 130. Here, the identification information refers to information capable of identifying the access point 110 and may be typically an SSID (Service Set Identifier).

The access point 110 receives the shanghai link data stream from the terminals 120, 122 and 124 and transmits the stream data to the Internet network 130 or receives the downlink data stream from the Internet network 130, 124). However, unlike other wireless communication repeaters, the access point 110 exchanges data streams using the same channel as a plurality of terminals, so that the risk of collision between data streams needs to be prevented.

The access point 110 periodically transmits a beacon to the terminals 120, 122, and 124. A beacon is a signal transmitted by the access point 110 unilaterally to inform the existence of a wireless network and allow the terminals 120, 122, and 124 to participate in the wireless network. The access point 110 may transmit the number of terminals to be connected to the Internet network 130 to the terminals 120, 122, and 124 by using the beacon.

The access point 110 may be implemented as any device capable of relaying the Internet network 130 and the terminals 120, 122, and 124. Although FIG. 1 illustrates the access point 110 as a relay device, the present invention is not limited thereto. The access point 110 may be implemented as a terminal, and a specific terminal may relay other terminals 120, 122, and 124.

The terminals 120, 122, and 124 are devices that access the access point 110 to use the wireless LAN. The terminals 120, 122, and 124 include all communication devices such as a smart phone, a tablet PC, and a smart watch. In addition to smart devices, all of the IoT (Internet of Things ) Equipment.

The terminals 120, 122, and 124 exchange data frames with the receiving apparatus using a method selected according to the communication environment. When only a specific data frame exchange scheme is used, the terminals 120, 122, and 124 can not prevent collision between data frames according to a communication environment, or prevent overhead of a frame. Therefore, the terminals 120, 122, and 124 exchange data frames with the receiving apparatus using the CSMA / CA scheme in consideration of the communication environment, or exchange data frames with the receiving apparatus using the RTS / CTS exchange scheme. Here, the receiving apparatus may be an access point 110, but it is not limited thereto. The receiving apparatus may receive a data frame transmitted from the terminal 120, 122, or 124 such as another terminal, ≪ / RTI > Hereinafter, a receiving apparatus will be described as an access point 110. [ A method for exchanging data frames with the access point 110 using a method selected according to a communication environment by the terminal will be described in detail with reference to FIGS. 2 to 4. FIG.

2 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.

2, terminals 120, 122 and 124 according to an embodiment of the present invention include a wireless communication unit 210, a communication mode setting unit 220, a control unit 230, and a memory unit 240 .

The wireless communication unit 210 exchanges data frames according to the established communication method with the access point 110. [ When the CSMA / CA scheme is set, the wireless communication unit 210 exchanges data frames with the access point 110. On the other hand, when the RTS / CTS exchange scheme is set, the wireless communication unit 210 exchanges RTS frames and CTS frames before exchanging data frames with the access point 110, and then exchanges data frames.

The wireless communication unit 210 may receive a data frame from another terminal or receive a beacon from the access point 110. [

The communication mode setting unit 220 sets a communication mode for exchanging data streams with the access point 110 in consideration of the communication environment. A detailed description thereof will be described with reference to Fig.

3 is a diagram illustrating a configuration of a communication mode setting unit according to an embodiment of the present invention.

3, a communication mode setting unit 220 according to an embodiment of the present invention includes a condition determination unit 310, an initial value setting unit 320, and a mode determination unit 330.

The condition determination unit 310 determines whether the current communication environment satisfies predetermined conditions. The communication environment to be determined includes at least one of the number of other terminals to which the terminals 120, 122 and 124 desire to access the access point 110 and the data rate of the current data frame. In this case, the condition determining unit 310 determines whether the wireless communication unit 210 receives the data frame received from another terminal or the beacon received from the access point 110, . The wireless communication unit 210 may receive a data frame to be transmitted to an access point by another terminal. The data frame includes an identifier for identifying each terminal such as a MAC address of the terminal. Therefore, the condition determination unit 310 can identify the terminals that transmitted the respective data frames using the data frame received by the wireless communication unit 210, and determine how many other terminals are to access the access point 110. Alternatively, the access point 110 may determine the number of terminals that transmitted the data frame in order to make a connection thereto. The access point 110 transmits the beacon by including the corresponding information in the beacon so that the number of the terminals attempting to access the access point 110 can be known. The access point 110 transmits a beacon including the information so that the number of other terminals existing around the specific terminal can be known even if the specific terminal is not accessing the terminal itself. The condition determination unit 310 can confirm how many other terminals are to access the access point 110 by using the beacon received from the access point 110 by the wireless communication unit 210. [

The initial value setting unit 320 sets the initial value of the mode setting parameter according to the determination result of the condition determination unit 310. [ The mode setting parameter is a numerical value of the communication environment to be considered for determining the communication mode, and has a different value depending on the communication environment. The initial value setting unit 320 assigns the initial values of the mode setting parameters as shown in the following table.

Figure 112017045007109-pat00001

Here, N denotes the number of other terminals to be connected to the access point 110, and R denotes a data rate of the current data frame. Referring to the table, when the same value is N, the initial value setting unit 320 sets a smaller value as the initial value of the mode setting parameter as R becomes larger, and when the value R has the same value, the initial value setting unit 320 The smaller N is, the smaller the initial value of the mode setting parameter is set. That is, the initial value setting unit 320 sets the initial value of the mode setting parameter to a smaller value as the number of other terminals to access the access point 110 is smaller, and the data rate of the current data frame is higher. The above-described table shows an example in which the initial value setting unit 320 sets the initial value of the mode setting parameter, and the initial value of the mode setting parameter is not limited thereto.

On the other hand, if some or all of the numbers of other terminals to be connected to the access point 110 and the data rate of the current data frame are changed while setting the initial value of the mode setting parameter, the initial value setting unit 320 sets The initial value of the new method setting parameter is reset according to the condition.

The mode determination unit 330 adjusts the value of the mode setting parameter and determines the communication mode according to whether the value of the mode setting parameter exceeds a preset reference value. The smaller value of the mode setting parameter means that the number of other terminals to access the access point 110 is small and the data rate of the current data frame is high. In such an environment, it is more preferable to exchange the RTS frame and the CTS frame separately and exchange the data frame immediately without increasing the overhead due to the exchange of the frame. On the other hand, the value of the mode setting parameter is large, which means that the number of other terminals to access the access point 110 is large and the data rate of the current data frame is low. If data frames are directly exchanged in such an environment, there is a high possibility that collision between data frames occurs, so that it is preferable that the RTS / CTS exchange method is used because an access point may not receive data frames correctly. The mode determination unit 330 determines the communication mode according to the value of the mode setting parameter by adjusting the value of the mode setting parameter.

First, the mode determination unit 330 adjusts the value of the mode setting parameter. The UEs 120, 122, and 124 attempt to exchange data frames with the access point by transmitting data frames using the CSMA / CA scheme, and the exchange of data frames fails (that is, Response is not received), the mode determination unit 330 increases the value of the mode setting parameter by a preset value. For example, when the value of the mode setting parameter has the same value as the above-described table, the mode determination unit 330 may increase the value of the mode setting parameter by one when the data frame is not exchanged with the access point.

In adjusting the value of the mode setting parameter, the mode determination unit 330 changes the number of times of adjustment according to the initial value of the mode setting parameter. The smaller the initial value of the mode setting parameter, the more the opportunity for the mode determination unit 330 to adjust the mode setting parameter value. For example, when the predetermined reference value is set to 0 and the initial value of the mode setting parameter is set to -3, the mode determination section 330 determines the number of times that the mode setting parameter value may exceed -3 from 0 You can grant an adjustment opportunity by four times. Conversely, when the initial value of the mode setting parameter is set to 1 or more, the mode determination unit 330 does not give an opportunity to adjust the mode setting parameter value. As more opportunity for adjusting the method configuration parameter value is given, the number of times that the terminals 120, 122, and 124 attempt to exchange data frames with the access point using the CSMA / CA method increases. This is because, as described above, as the initial value of the mode setting parameter is smaller, the terminal 120, 122, 124 is in a communication environment in which it is preferable to use the CSMA / CA method, and the larger the initial value of the mode setting parameter, 120, 122, and 124 are in a communication environment where it is desirable to use the RTS / CTS exchange scheme.

The mode determination unit 330 determines whether the value of the mode setting parameter exceeds a preset reference value. When the value of the adjusted mode setting parameter or the initial value of the mode setting parameter exceeds the predetermined reference value through the above-described adjustment process, the mode determination unit 330 determines whether or not the access using the RTS / CTS exchange method And decides to exchange points and data frames. For example, when the reference value is set to 0, the mode determination unit 330 determines whether the value of the mode setting parameter exceeds 0 or not. When the number of other terminals to be connected to the access point 110 is 10 and the current rate is smaller than R1, the initial value of the mode setting parameter is set to 2. [ The mode determination unit 330 determines to use the RTS / CTS exchange mode immediately without adjusting the value of the mode setting parameter because the initial value of the set mode setting parameter exceeds 0, which is a preset reference value. Alternatively, if the number of other terminals to be connected to the access point 110 is five and the current transmission rate is greater than R3, the initial value of the mode setting parameter is set to -2. Therefore, the opportunity to adjust the value of the mode setting parameter may be given three times, and the mode determination unit 330 tries to exchange the data frame with the access point using the CSMA / CA method three times. When the exchange of the data frame with the access point fails, the mode determination unit 330 increments the value of the mode setting parameter by 1, and the value of the mode setting parameter exceeds 0. As described above, the mode determination unit 330 determines to use the RTS / CTS exchange method even when the value of the mode setting parameter that has undergone the adjustment process exceeds a predetermined reference value. On the other hand, if the exchange of the data frame is successful by attempting to exchange data frames with the access point using the CSMA / CA scheme through the above-described adjustment process, the mode determination unit 330 uses the CSMA / To decide to exchange data frames.

Referring back to FIG. 2, the controller 230 controls the wireless communication unit 210 to operate according to the communication mode determined by the communication mode setting unit 220. If the communication mode setting unit 220 determines that the value of the mode setting parameter or the initial value exceeds the preset reference value and uses the RTS / CTS exchange mode, the controller 230 determines And controls the wireless communication unit 210 to transmit the RTS frame. On the other hand, when the communication mode setting unit 220 determines that the initial value of the mode setting parameter does not exceed the preset reference value and the exchange of data frames with the access point is successful during the adjustment process and uses the CSMA / CA exchange mode, 230 controls the wireless communication unit 210 to exchange data frames immediately without transmitting another RTS frame according to the determination.

The memory unit 240 may store data required to be stored in the communication mode setting process of the communication mode setting unit 220. Alternatively, the memory unit 240 may store connection information, authentication information, and the like so that the terminals 120, 122, and 124 may attempt to connect to the access point 110 or continue.

4 is a flowchart illustrating an operation method of a terminal according to an embodiment of the present invention.

The communication mode setting unit 220 sets the initial value of the mode setting parameter according to whether the current communication environment satisfies the predetermined condition (S410). The condition determination unit 310 determines whether the current communication environment satisfies a predetermined condition. The communication environment to be determined is determined by the condition determination unit 310 that the terminal 120, 122, or 124 accesses the access point 110 And the data rate of the current data frame. The initial value setting unit 320 sets the initial value of the mode setting parameter according to the determination result of the condition determining unit 310. [ The smaller the transmission rate of the current data frame and the smaller the number of other terminals to access the access point 110, the smaller the initial value of the mode setting parameter.

The communication mode setting unit 220 adjusts the value of the mode setting parameter according to the exchange of data frames with the receiving end (S420). The UEs 120, 122, and 124 attempt to exchange data frames with the access point by transmitting data frames using the CSMA / CA scheme, and when the exchange of data frames fails, the mode determination unit 330 determines Increase the value of the parameter by a preset value. At this time, in adjusting the value of the mode setting parameter, the mode determination unit 330 changes the number of times of adjustment according to the initial value of the mode setting parameter. The smaller the initial value of the mode setting parameter, the more the opportunity for the mode determination unit 330 to adjust the value of the mode setting parameter. That is, as the initial value of the mode setting parameter is smaller, the terminals 120, 122, and 124 have more opportunities to exchange data frames with the access point using the CSMA / CA scheme.

The communication mode setting unit 220 determines whether the mode setting parameter value exceeds a predetermined reference value (S430). The mode determination unit 330 determines whether a mode setting parameter value that has undergone the adjustment process or an initial value of the mode setting parameter that has not undergone a separate adjustment process exceeds a preset reference value.

If the mode setting parameter value exceeds the preset reference value, the communication mode setting unit 220 determines to use the RTS / CTS exchange mode (S440). If the mode setting parameter value after the adjustment process exceeds the preset reference value, the mode determination unit 330 determines to use the RTS / CTS exchange mode. On the other hand, when the initial value of the mode setting parameter exceeds the preset reference value, the mode determination unit 330 determines to use the RTS / CTS exchange mode immediately without any adjustment opportunity.

If the mode setting parameter value does not exceed the preset reference value, the CSMA / CA mode is determined to be used (S450). When the exchange of the data frame is attempted by exchanging the data frame with the access point using the CSMA / CA scheme, the mode determination unit 330 exchanges data frames with the access point using the CSMA / CA scheme .

In FIG. 4, it is described that each process is sequentially executed, but this is merely illustrative of the technical idea of an embodiment of the present invention. In other words, those skilled in the art will appreciate that various changes and modifications may be made without departing from the essential characteristics of one embodiment of the present invention, And FIG. 4 is not limited to the time-series order because it can be variously modified and modified by being executed in parallel.

Meanwhile, the processes shown in FIG. 4 can be implemented as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. That is, a computer-readable recording medium includes a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g., CD ROM, And the like). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

The foregoing description is merely illustrative of the technical idea of the present embodiment, and various modifications and changes may be made to those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than restrictive, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

100: wireless LAN system 110: repeater
120, 122, 124: terminal 130:
210: wireless communication unit 220: communication mode setting unit
230: control unit 240: memory unit
310: condition determination unit 320: initial value setting unit
330:

Claims (9)

A method for a transmitting apparatus adaptively exchanging data frames in a wireless LAN system,
A setting process of setting an initial value of the mode setting parameter according to whether the predetermined condition is satisfied;
An adjustment step of adjusting a value of the mode setting parameter according to whether exchange of a data frame with a receiving apparatus is possible; And
To-send (CTS) or clear-to-send (CTS) frame according to whether the initial value of the mode setting parameter or the value of the mode setting parameter adjusted in the adjusting process exceeds a predetermined reference value The decision process to decide whether to use
Wherein the setting step sets the initial value of the mode setting parameter to a smaller value as the number of other transmission devices to exchange data frames with the receiving device is smaller or the transmission rate of the current data frame of the transmitting device is larger, / RTI > wherein the method comprises the steps of: The method according to claim 1,
In the setting process,
Wherein at least one of a number of other transmission apparatuses to exchange data frames with the receiving apparatus and a transmission rate of a current data frame of the transmission apparatus is considered in determining whether the predetermined condition is satisfied, Exchange method. delete A method for a transmitting apparatus adaptively exchanging data frames in a wireless LAN system,
A setting process of setting an initial value of the mode setting parameter according to whether the predetermined condition is satisfied;
An adjustment step of adjusting a value of the mode setting parameter according to whether exchange of a data frame with a receiving apparatus is possible; And
Determining whether to use an exchange method of an RTS or a CTS frame according to whether an initial value of the mode setting parameter or a value of a mode setting parameter adjusted in the adjusting process exceeds a preset reference value
Wherein the adjusting step adjusts the number of adjustment to the value of the mode setting parameter according to an initial value of the mode setting parameter. 5. The method of claim 4,
In the adjustment process,
Wherein the value of the mode setting parameter is adjusted more as the initial value of the mode setting parameter is smaller. The method according to claim 1,
In the adjustment process,
And if the exchange of the data frame with the receiving apparatus fails, the mode setting parameter value is increased by a preset value. The method according to claim 1,
In the determination process,
Determining whether to use an exchange scheme of RTS and CTS frames if the scheme setting parameter value exceeds a preset reference value and if the scheme setting parameter value does not exceed a preset reference value, The method comprising the steps of: (a) determining whether to use a direct exchange of frames. A transmission apparatus for adaptively exchanging data frames in a wireless LAN system,
The initial value of the mode setting parameter is set according to whether or not the preset condition is satisfied and the value of the mode setting parameter adjusted when the value of the mode setting parameter is adjusted according to whether or not exchange of the data frame with the receiving apparatus is possible, A communication mode setting unit that sets a communication mode according to whether the number of the communication channels exceeds a predetermined threshold value;
A control unit configured to control the communication mode setting unit to communicate according to the communication mode set by the communication mode setting unit; And
A wireless communication unit for transmitting / receiving a data frame to / from the receiving device under control of the control unit or transmitting / receiving an RTS or CTS frame;
Wherein the communication mode setting unit sets the initial value of the mode setting parameter to a smaller value as the number of other transmission devices to exchange data frames with the receiving device is smaller or the transmission rate of the current data frame of the transmitting device is larger Wherein the data frame transmission apparatus comprises: 9. The method of claim 8,
Wherein the communication mode setting unit comprises:
A condition determiner for determining whether the predetermined condition is satisfied;
An initial value setting unit for setting an initial value of the mode setting parameter according to the determination result of the condition determination unit; And
The method comprising the steps of: receiving an RTS and / or an RTS frame from the receiving apparatus; and adjusting the value of the mode setting parameter according to whether or not the data frame can be exchanged with the receiving apparatus, if the initial value of the mode setting parameter or the adjusted mode setting parameter exceeds a preset reference value. Determining to use a scheme of exchanging CTS frames, and when the value of the adjusted scheme setting parameter does not exceed a preset reference value, determining a scheme of using a scheme of directly exchanging data frames without exchange of RTS and CTS frames Wherein the data frame transmission unit comprises:
KR1020170058932A 2017-05-11 2017-05-11 Apparatus and Method for Exchanging Data Frame Adaptively in Wireless Lan System KR101859602B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070060597A (en) * 2005-12-09 2007-06-13 삼성전자주식회사 Apparatus and method for controlling transmission rate according to collision in wireless lan
KR20090129009A (en) * 2008-06-12 2009-12-16 주식회사 케이티 Method for detecting hidden station problem, to apply and cancel adapatable rts/cts exchage method
KR20140091279A (en) * 2013-01-11 2014-07-21 주식회사 엘지유플러스 Method of transmitting data in wireless communication system and apparatus thereof
KR20160048110A (en) * 2013-08-28 2016-05-03 퀄컴 인코포레이티드 Adaptive rts/cts in high-efficiency wireless communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070060597A (en) * 2005-12-09 2007-06-13 삼성전자주식회사 Apparatus and method for controlling transmission rate according to collision in wireless lan
KR20090129009A (en) * 2008-06-12 2009-12-16 주식회사 케이티 Method for detecting hidden station problem, to apply and cancel adapatable rts/cts exchage method
KR20140091279A (en) * 2013-01-11 2014-07-21 주식회사 엘지유플러스 Method of transmitting data in wireless communication system and apparatus thereof
KR20160048110A (en) * 2013-08-28 2016-05-03 퀄컴 인코포레이티드 Adaptive rts/cts in high-efficiency wireless communications

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