KR101205721B1 - Apparatus and method for transmitting/receiving data in a wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for efficiently transmitting and receiving data using a channel that is a resource in a wireless communication system using multiple channels and multiple antennas, and searching for a plurality of channels formed by a plurality of antennas. Collecting the channel information of the searched channels and analyzing the searched channels, selecting a master channel among the analyzed channels, and determining the remaining channels except the master channel as slave channels, Determine the rank of the slave channels, determine a Modulation Coding Scheme (MCS) level for the master channel, determine antennas corresponding to the master channel among the plurality of antennas, and determine the master channel Check the number of remaining antennas except for the corresponding antennas, and the identified number Correspondingly determines the antenna corresponding to the slave channel, transmits and receives data via the plurality of channels, using the determined antenna.

WLAN, Multiple Antennas, Multiple Channels, OFDM, CSMA / CA

Description

Apparatus and method for transmitting / receiving data in a wireless communication system

The present invention relates to a wireless communication system, and more particularly, to an apparatus and method for efficiently transmitting and receiving data using a channel that is a resource in a wireless communication system using multiple channels and multiple antennas.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy [Task Management Number: 2006-S-014-03, Task name: 200Mbps IEEE 802.11n modem and RF chipset development].

In the next generation communication system, active researches are being conducted to provide users with services having high quality of service (QoS: Quality of Service, hereinafter referred to as 'QoS'). In particular, research on a wireless local area network (WLAN) system as an example of a wireless communication system is actively conducted through the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. It is becoming. In addition, the WLAN system performs communication using only one channel for a single antenna, and recently, a study for applying multiple antennas to an IEEE 802.11 system has been conducted. In order to improve performance of such a wireless communication system, various methods for effectively using resources such as channels, time, and space have been proposed.

BACKGROUND ART Currently, a wireless communication system has been widely used. An orthogonal frequency division multiplexing (OFDM) scheme has been proposed. The OFDM communication system is a system for transmitting a large amount of data in a wide bandwidth, and each subcarrier constituting a channel has orthogonality to transmit more data. In addition, the OFDM communication system is a system having various advantages such as robustness to a channel environment by minimizing interference between transmitted symbols. When multiple antennas are applied to such an OFDM communication system, a spatial dimension is added to have a high data rate, and the performance of the system can be improved by obtaining diversity gain.

However, there are limited channels for easy access by more users to a communication system using a wide band as described above, and in particular, carrier sense multiple access / collision avoidance (CSMA / CA) used in WLAN systems. When applying media access control (MAC: Media Access Control, hereinafter referred to as 'MAC') protocols such as Access / Collision Avoidance (hereinafter referred to as 'CSMA / CA'), certain The above much waiting time is required, and the problem which inevitably throws away much time arises simultaneously.

In addition, according to the number of users and the amount or type of traffic (traffic) assigned to the channel, a lot of time that the channel is not used, thereby causing a problem that the use efficiency of the limited channel is reduced. In order to solve these problems, various methods for using a limited channel more efficiently using a multi-channel MAC technology have been considered in recent years, but specific methods have not been proposed yet.

Therefore, while using multiple antennas in the above-described OFDM system, a method of transmitting and receiving data using multiple antennas and channels in order to improve the utilization rate of a channel possible in a given environment and to maintain a high data rate at the same time is possible. need.

Accordingly, an object of the present invention is to provide an apparatus and method for transmitting and receiving data in a wireless communication system.

Another object of the present invention is to provide a data transmission / reception apparatus and method for improving the throughput of an entire system by making a relationship between multiple antennas and channels in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for transmitting and receiving data using multiple antennas and multiple channels in a wireless communication system.

In addition, another object of the present invention is to provide an apparatus and method for efficiently transmitting and receiving data using a limited channel through multiple antennas in a wireless communication system including multiple channels.

In addition, another object of the present invention is to improve the performance of the system by increasing the data rate in a wireless communication system using multiple channels and multiple antennas, an apparatus for efficiently transmitting and receiving data using the channel, time and space, etc. And providing a method.

An apparatus of the present invention for achieving the above objects, the collection unit for searching a plurality of channels formed by a plurality of antennas, and collecting channel information of the searched channels; A selecting unit for analyzing the searched channels using the channel information and selecting a master channel from the analyzed channels; A determination unit for determining the remaining channels other than the master channel as slave channels, determining the rank of the slave channels, and determining a modulation and coding scheme (MCS) level for the master channel; A switching unit configured to determine an operation mode of the antennas corresponding to the master channel among the plurality of antennas and an operation mode of the antennas corresponding to the slave channels; And a processor configured to process data transmitted / received through the channels using the antennas in which the operation mode is determined.

A method of the present invention for achieving the above objects, the method comprising the steps of: searching a plurality of channels formed by a plurality of antennas, collecting channel information of the searched channels to analyze the searched channels; Selecting a master channel among the analyzed channels, and determining the remaining channels other than the master channel as slave channels, and determining the rank of the slave channels; After determining a modulation coding scheme (MCS) level for the master channel, the antennas corresponding to the master channel are determined among the plurality of antennas, and the other antennas except for the antennas corresponding to the master channel are determined. Checking a number and determining antennas corresponding to the slave channels according to the checked number; And transmitting and receiving data through the plurality of channels using the determined antennas.

The present invention can improve data throughput and transmission rate by transmitting and receiving data using multiple antennas and multiple channels in a wireless communication system, thereby improving performance of the system. In addition, the present invention not only improves the performance of the system within a given channel, but also efficiently allocates resources by combining spatial resources (antennas) and frequency resources (channels), which are radio resources allocated to users' stations. Can be used as

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention provides an apparatus and method for transmitting and receiving data in a wireless communication system, such as a wireless local area network (WLAN) system and an Institute of Electrical and Electronics Engineers (IEEE) 802.11 system. Suggest. Here, although an embodiment of the present invention to be described below is described with an example of a WLAN and IEEE 802.11 system, the data transmission and reception method proposed in the present invention can be applied to other communication systems.

In addition, the present invention proposes an apparatus and method for transmitting and receiving data by efficiently using multiple channels using multiple antennas in a wireless communication system. In an embodiment of the present invention to be described later, by applying a multi-antenna applied to a communication system of Orthogonal Frequency Division Multiplexing (OFDM) scheme to a WLAN system including a multi-channel data An apparatus and method for transmitting and receiving are proposed. In an embodiment of the present invention, while using multiple antennas in the OFDM system, multiple antennas and channels are used to improve the utilization rate of a channel that is possible in a given environment and to maintain a high data rate at the same time. An apparatus and method for transmitting and receiving data are provided.

In addition, the present invention proposes a data transmission / reception apparatus and method for improving the throughput of an entire system by making a relationship between multiple antennas and channels in a wireless communication system. Here, in an embodiment of the present invention, a medium access control such as Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) (hereinafter referred to as 'CSMA / CA') used in a WLAN system (MAC: Media Access Control, hereinafter referred to as 'MAC') When the protocol is applied to an OFDM type communication system, a station that is a terminal of users who want to transmit and receive data (Station, hereinafter referred to as 'STA') They each communicate within the channel assigned to them, improve data throughput within the channel assigned to them using multiple antennas, and improve data rate by obtaining diversity gain through multiple antennas. Let's do it.

In addition, in an exemplary embodiment of the present invention, even when there are no users or sufficient margins in other channels by using multiple antennas in a given channel, when there are many users or a lot of traffic in a given channel, the overall data throughput rate is increased. This prevents it from falling. In addition, in an embodiment of the present invention, in order to increase the data throughput for any user, a method in which a channel allocated to the user and an adjacent channel are combined and used as one channel, and the channel as described above. In order to combine the other channels to randomly empty the channel to use efficiently.

Here, in an embodiment of the present invention, a wireless communication system connects to a plurality of access points (APs), like the WLAN system, through the plurality of APs to provide a communication service. It has a communication environment in the form of a basic service set (BSS: Basic Service Set, hereinafter referred to as a 'BSS') including a plurality of STAs. In addition, in an exemplary embodiment of the present invention, in a general WLAN environment in which the BSS is present through a plurality of channels for convenience of description, a plurality of adjacent channels exist and are used in the form of one channel through a combination of channels. In this case, the description will be omitted. Next, a wireless communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 1.

1 is a view schematically showing the structure of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, the wireless communication system is connected to a plurality of APs, for example, AP1 160, AP2 170, and AP3 180, and the plurality of APs 160, 170, and 180 to communicate with each other. It includes a STA (100) for transmitting and receiving data to receive. Here, the APs 160, 170, and 180 include at least one antenna. Hereinafter, for convenience of description, AP1 160 is an AP corresponding to a master channel for the STA 100, and the remaining APs. That is, AP2 170 and AP3 180 are APs corresponding to slave channels, and AP3 180 is an AP that combines two APs and is an AP capable of multi-channel controllable. It is assumed that the description will be made.

The STA 100 includes a plurality of antennas 132.134.136.138 that form a plurality of wireless channels with the antennas 162, 164, 172, 182, 184 of the APs 160, 170, 180, and the STA 100 and the APs 160, 170, 180. ) Transmits and receives data using multiple antennas and multiple channels. And, the STA 100, a processing unit 110 for processing data transmitted and received through the plurality of antennas (132, 134, 136, 138) and RF signals for transmission and reception on the plurality of wireless channels, and the processing unit 110 ) And a reconstruction unit 120 coupling between the plurality of antennas 132, 134, 136, and 138.

The reconstruction unit 120 of the STA 100 includes: a switching unit 122 for switching the plurality of antennas 132.134.136.138 to a transmission mode (TX mode) and a reception mode (RX mode), and the plurality of antennas Selector 124 for selecting a corresponding channel for data transmission / reception among channels formed between the antennas 132.134.136.138 and the antennas 162, 164, 172, 182 and 184 of the APs 160, 170 and 180, and combining the adjacent channels among the formed channels. The unit 136 and a filter 128 that performs channel filtering on the available channel to the STA 100.

Although not specifically illustrated in FIG. 1, the STA 100 searches for channels formed between the plurality of antennas 132.134.136.138 and the antennas 162, 164, 172, 182, and 184 of the APs 160, 170, 180. It includes a collector (not shown) for collecting the channel information of the searched channels. The selector 124 of the STA 100 selects a master channel of the STA 100 using the collected channel information. In addition, the STA 100, after determining the remaining channels other than the master channel as a slave channel to determine the rank of the slave channels, the modulation and coding scheme (MCS: Modulation Coding Scheme, And a decision unit (not shown) for determining a level. Here, the determination unit determines the number of antennas to be used for data transmission and reception when determining the MCS level, and if the antenna number is determined in this way, the antennas operating in the transmission mode and the antennas operating in the reception mode by the switching unit 122. Decide Accordingly, a channel to be used for data transmission and reception is allocated to the STA 100.

In addition, when the power is turned on, the STA 100 has two time phases, that is, phases 1 (210, 230) and phases, on a time interval (time axis), as shown in FIG. 2 (220,240), and repeats the operation of phase 1 (210,230) and phase 2 (220,240). 2 is a diagram illustrating a time interval operation of an STA in a wireless communication system according to an exemplary embodiment of the present invention.

In more detail, as described above, the STA 100 repeatedly operates in phase 1 (210, 230) and phase 2 (220, 240) as described above, respectively. The phase 1 (210, 230), the channel formed between the STA 100 and the APs (160, 170, 180), that is, a channel listening period (listening channels) for listening to multiple channels, the STA 100 is a channel that can be connected to Check. Then, in phase 1 (210, 230), the STA 100, after deriving the magnitude of the signal input through the identified channel and the statistical characteristics of the identified channel, and determines the transmission method of data in the identified channel. In addition, the phase 2 (220, 240) is a data transmission and reception period (transmitting / receiving data) in which the STA 100 performs the transmission and reception of the actual data using the information obtained through the phase 1 (210, 230).

That is, when the power is turned on, the STA 100 enters the first phase 1 210 of the above-described time phases 210, 220, 230, and 240. During the first phase 1 210, the STA 100 collects channel information as described above, and in particular, analyzes channel occupancy of each channel. Here, the STA 100, the number of users of each interval in the channel and the degree of traffic (for example, traffic classification by analyzing the shape of the transmission and reception data (for example, to the service type of the communication service that the STA 100 is to be provided) Corresponding data size)) confirms the channel occupancy of the channel, and the channel occupancy of the channel includes information on the access time of the channel and the average time occupying the channel.

The STA 100 analyzes each channel as described above, and selects a channel having the lowest channel occupancy and the highest channel state among the analyzed channels as a master channel, and excluding the master channel. Channels are determined as slave channels and the slave channels are ranked. Here, the channel state may include a received signal strength indicator (RSSI) and a signal to noise ratio (SNR). And channel response characteristics (CRC: Channel Response Characteristics, hereinafter referred to as 'CRC') are determined and taken into consideration. The ranking of the slave channels may be determined based on channel occupancy of the slave channels, channel status, and the like. When the master channel selection for the channels and the rank of the slave channel are determined in this way, the MCS level of the data that can be transmitted through the master channel is determined. At this time, the number of antennas to be used for data transmission and reception is determined. When the number of antennas is determined in this way, the determined antennas are switched to a transmission mode and a reception mode.

In addition, the STA 100 checks the number of remaining antennas that are physically usable except for the determined antennas, and at this time, to use the remaining channels by the checked antennas or to monitor the channel state. The MCS level for the master channel is determined so that the above antenna can be allocated.

Here, when there is only one remaining antenna, the STA 100 determines to use the remaining antenna as a transmitting antenna and a receiving antenna, and in this case, the remaining antenna can switch to a transmission mode and a reception mode, so that the slave Select one of the channels to improve the efficiency of the channel. In addition, the STA 100 may use the remaining antennas in a RX only mode, where the remaining antennas are used only for monitoring channel status, for example, occupancy of the channel. The remaining antennas are used to monitor channel use opportunities when the occupancy of the slave channels is large throughout the system, and the remaining antennas are transmitted to a transmission mode and a reception mode when there is room in any slave channel. Can be used to reset to switch.

On the other hand, when there are three or more remaining antennas, the STA 100 determines the MCS level for the first ranked slave channel among the determined slave channels, that is, masts antennas of the first ranked slave channel. The MCS level for the highest priority slave channel is determined, such as the allocation to the channel's antenna, that is, the MCS for the master channel. Here, when only two antennas are available in the remaining antennas, the STA 100 may allocate each antenna to a transmit only mode and a receive only mode antenna.

When the two antennas are allocated to the transmit-only mode and the receive-only mode antennas, the STA 100 may combine and transmit one or more channels during data transmission through the transmit-only mode antenna. That is, the STA 100 combines channels through an Inverse Fast Fourier Transform (IFFT) in the frequency domain, or for each channel. Modulated signals can be mixed and transmitted in the time domain.

In addition, the STA 100 performs a channel selection filter on available channels other than the master channel already selected as described above and the slave channel set to the transmission mode and the reception mode switching, as described above, through the reception-only mode antenna. The filter 128, which performs the function, performs channel filtering. In addition, the filter 128 of the STA 100 performs a channel filtering so that no data is received by being fed back to the channel in which data transmitted through the transmission-only mode antenna exists. For channels, open channels so that they can always receive data.

The STA 100, which has allocated all possible antennas to the available channels, enters the phase 2 220 and performs data transmission and reception with the APs 160, 170, and 180, and a general channel during the phase 2 220 period. Performs each CSMA / CA operation. The STA 100, which has transmitted and received data, enters phase 2 220 from phase 2 220 and performs channel information for each channel as described in phase 1 210 during the phase 3 230. After analysis, channel and antenna reallocation is performed. Accordingly, the STA 100 adaptively allocates resources of the antenna and the channel in response to the change of the channel (eg, the addition of another user and the change of data). Next, an operation process of the STA in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 3.

3 is a diagram schematically illustrating an operation process of an STA in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, when the power is turned on in step 302, the STA enters a channel listening section PHASE1 to search for multiple channels formed by multiple antennas, collects channel information of the found multiple channels, After analyzing the multiple channels using the collected channel information, a master channel is selected from the analyzed multiple channels, and the ranking of the slave channel is determined as a slave channel except for the selected master channel. Here, the master channel is the channel having the lowest channel occupancy and the highest channel state in the analyzed multi-channel, and the rank of the slave channel is determined in consideration of channel occupancy or channel state. For example, as shown in FIG. 4, the STA selects channel 44 as a master channel in multiple channels formed through its multiple antennas, and the remaining channels, that is, channels 40, 48, and 52 are slave channels. In this case, the rank of the slave channel is determined. In other words, the channel 40 is determined as the slave channel 1, the channel 52 as the slave channel 2, and the channel 48 as the slave channel 3. 4 is a diagram schematically illustrating multiple channels of an STA in a wireless communication system according to an exemplary embodiment of the present invention.

Next, in step 304, the MCS level for the selected master channel, that is, channel 44, is determined, and at this time, the number of antennas to be used for data transmission and reception through the master channel is determined. Here, switching to the transmission mode and the reception mode for the determined antenna. In operation 306, the number of remaining antennas that are physically usable except for the determined antennas is checked, and then the number of remaining antennas is determined to be greater than one.

As a result of the determination in step 306, if the number of remaining antennas exceeds one, it is determined in step 308 whether the number of remaining antennas is two. As a result of the determination in step 308, when there are two remaining antennas, in step 310, one of the two remaining antennas is determined to be a transmit only mode antenna, and the other remaining antennas are receive only mode antennas.

Next, in step 312, the mobile station enters the transmission / reception period PHASE2 and transmits / receives data through channels using the determined antennas. In step 314, it is determined whether the transmission / reception period PHASE2 ends. As a result of the determination in step 314, when the transmission / reception period PHASE2 ends, in step 316, it is determined whether to end data transmission / reception with the APs. The power of the STA is turned off.

On the other hand, as a result of the determination in step 316, if data is continuously transmitted and received with the AP, it enters the next channel listening interval, and accordingly proceeds to step 302 to analyze the multi-channel using the multi-channel channel information. After that, the master channel is selected and the slave channel is ranked.

In addition, if the transmission and reception period PHASE2 is not terminated as a result of the determination in step 314, the process proceeds to step 312 to transmit and receive data through channels. As a result of the determination in step 308, if the number of remaining antennas is two or more, the flow proceeds to step 304, and in step 304, the MCS level of the slave channel having the highest priority among the slave channels is determined. That is, the antenna of channel 40, which is the slave channel of the first priority, is assigned to the antenna of channel 44, which is the mast channel, and for this purpose, the channel, which is the slave channel of the highest priority, is determined as MCS for channel 44, which is the master channel. Determine the MCS level for 40.

In operation 306, if the number of remaining antennas is one, it is determined in step 318 whether the channel occupancy of the channel formed by the remaining antennas is greater than the appropriate channel occupancy. Here, the appropriate channel occupancy degree refers to the reference channel occupancy degree required to enable data transmission and reception when transmitting and receiving data through the corresponding channel.

As a result of the determination in step 318, if the channel occupancy of the remaining channels is greater than the appropriate channel occupancy, in step 320 it is determined to use the remaining antennas as the transmitting antenna and the receiving antenna. In this case, since the remaining antennas can switch to the transmission mode and the reception mode, one channel among the slave channels is selected to improve the use efficiency of the channel. In addition, the remaining antennas can be used in a receive only mode (RX only mode), where the remaining antennas are applied to use only to monitor the occupancy of the channel. Here, the occupancy monitoring of the channel is to use the remaining antennas to monitor the channel usage opportunity when the occupancy of the slave channels in the system is large, and the remaining antennas when there is room in any slave channel among the slave channels. Can be reset and used to switch to transmit mode and receive mode.

Then, in step 322, it enters the transmission and reception period PHASE2 and determines whether the channel occupancy of any slave channel is smaller than the appropriate channel occupancy degree among the monitored slave channels through the occupancy monitoring of the channel as described above. As a result of the determination in step 322, if the channel occupancy of the arbitrary slave channel is smaller than the appropriate channel occupancy, the process proceeds to step 312, and transmits and receives data through the channels using the determined antennas in step 312.

On the other hand, if the channel occupancy degree of the arbitrary slave channel is greater than the appropriate channel occupancy degree as a result of the determination in step 322, the process proceeds to step 324 since there is room in the arbitrary slave channel as described above. After resetting to switch the remaining antennas to the transmission mode and the reception mode, that is, determining the transmission mode and the reception mode switching in step 324, the process proceeds to step 312, and the channels are determined using the determined antennas in step 312. Send and receive data through

In operation 318, when the channel occupancy of the remaining channels is smaller than the appropriate channel occupancy, the flow proceeds to step 324 to determine transmission mode and reception mode switching of the remaining antennas.

As such, in a wireless communication system according to an exemplary embodiment of the present invention, a STA includes a plurality of transmit / receive antennas, for example, four transmittable antennas as shown in FIG. 1, and four channels as shown in FIG. 4. In an environment where channels (channel 40, channel 44, channel 48, and channel 52) having continuous 20 MHz frequency bands can be used, the channel information is collected by searching the channels in a channel listening period when turned on. Then, the master channel is selected using the channel information, the remaining channels are determined as slave channels, and the order of slave channels is determined according to the channel status of the slave channels.

Then, the STA determines the MCS level for the selected master channel, and also determines the number of antennas to transmit and receive data through the master channel. For example, as described with reference to FIG. 1, when the AP corresponding to the master channel is AP1 160, two transmit / receive antennas are included in the AP1 160 that transmits and receives data through the master channel. Since Spatial Division Multiplexing (SDM) can be applied, two antennas, for example, antenna 1 132 and antenna 2 134 are preferentially allocated to the master channel to obtain the maximum data rate.

In addition, the remaining antennas and channels of the STA, such as antenna 3 (136) and antenna 4 (138), channels (e.g., slave channel 1 (channel 40), slave channel 2 (channel 52), and slave channel 3 ( In order to efficiently use channel 48, the above-described operation is performed to allocate the remaining antennas, for example, as an AP corresponding to slave channels, AP2 172 including one antenna and multi-channel control are performed. When the AP3 180 is checked, the antenna 3 136 and the antenna 4 138 are allocated to the transmit-only mode antenna and the receive-only mode antenna, respectively, where the receive-only mode antenna is a channel except the master channel. That is, the channel selection filtering function is applied to the slave channels. When data is transmitted through the transmission-only mode antenna, the channel selection filtering function is applied to the channels except for the data transmission channel. This document applies channel select filtering to be performed.

Further, the STA transmits and receives data through the multi-antenna and the multi-channel allocated in the data transmission / reception interval, and when the channel listening period is again, the STA checks the overall channel state and performs the above-described operation again to perform the multi-antenna and the multi-channel. Reallocate Accordingly, in the embodiment of the present invention, while using multiple antennas, a plurality of channels can improve the utilization of a channel possible in a given environment, and at the same time maintain a high data rate to improve the performance of the overall system.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a view schematically showing the structure of a wireless communication system according to an embodiment of the present invention.

2 is a diagram illustrating a time interval operation of an STA in a wireless communication system according to an exemplary embodiment of the present invention.

3 is a diagram schematically illustrating an operation process of an STA in a wireless communication system according to an exemplary embodiment of the present invention.

4 is a diagram schematically illustrating multiple channels of an STA in a wireless communication system according to an embodiment of the present invention.

Claims (20)

In the method of transmitting and receiving data in a wireless communication system, Searching for a plurality of channels formed by a plurality of antennas, collecting channel information of the searched channels, and analyzing the searched channels; Selecting a master channel among the analyzed channels, and determining the remaining channels other than the master channel as slave channels, and determining the rank of the slave channels; After determining a modulation coding scheme (MCS) level for the master channel, the antennas corresponding to the master channel are determined among the plurality of antennas, and the other antennas except for the antennas corresponding to the master channel are determined. Checking a number and determining antennas corresponding to the slave channels according to the checked number; And And transmitting and receiving data through the plurality of channels using the determined antennas; The determining of the antennas may include: determining to switch the antennas corresponding to the master channel to a transmission mode and a reception mode, and to convert the antennas corresponding to the slave channels into the transmission mode and the reception mode according to the identified number. A method for transmitting or receiving data, characterized in that the switching or the transmission-only mode or the reception-only mode. The method of claim 1, The transmitting and receiving of data is performed in a data transmission / reception section on a time interval, and the remaining steps except for transmitting and receiving data are performed in a channel listening section on the time interval. . The method of claim 1, The selecting of the master channel may include selecting a channel having the lowest channel occupancy and the highest channel state among the analyzed channels as the master channel. The method of claim 3, The channel occupancy degree is determined by the number of users and the traffic of each channel in the searched channels, and includes access time information of the searched channels and average time information occupying the searched channels. A data transmission / reception method. delete The method of claim 1, The determining of the antennas may include: when the antennas corresponding to the slave channels are equal to or greater than a preset number of antennas, determine a modulation and coding scheme level for the highest slave channel in the rank of the slave channels, and then correspond to the highest slave channel. And determining to switch the antenna to the transmission mode and the reception mode. The method of claim 1, The determining of the antennas may include determining antennas corresponding to the slave channels as the transmission only mode and the reception only mode when the antennas corresponding to the slave channels are less than or equal to a preset number of antennas. How to send and receive. The method of claim 1, The reception-only mode, the channel state of the channel monitoring through the channel selection filtering, the transmission-only mode, the data transmission and reception method characterized in that to combine the adjacent channels to transmit the data in the combined multiple channels. The method of claim 1, The determining of the antennas may include comparing the channel occupancy rate of the slave channels with a preset channel occupancy rate when there are one antenna corresponding to the slave channels, and corresponding to the comparison result, an antenna corresponding to the slave channels. And transmitting the signal to the reception-only mode. 10. The method of claim 9, The determining of the antennas may include determining that the antennas corresponding to the slave channels are switched to the reception mode and the transmission mode when the channel occupation rate of the slave channels is smaller than the preset channel occupation degree. How to send and receive. An apparatus for transmitting and receiving data in a wireless communication system, A collecting unit for searching a plurality of channels formed by a plurality of antennas and collecting channel information of the searched channels; A selecting unit for analyzing the searched channels using the channel information and selecting a master channel from the analyzed channels; A determination unit for determining the remaining channels other than the master channel as slave channels, determining the rank of the slave channels, and determining a modulation and coding scheme (MCS) level for the master channel; A switching unit configured to determine an operation mode of the antennas corresponding to the master channel among the plurality of antennas and an operation mode of the antennas corresponding to the slave channels; And And a processor configured to process data transmitted / received through the channels using the antennas in which the operation mode is determined; The switching unit determines to switch the antennas corresponding to the master channel to a transmission mode and a reception mode, and switches the antennas corresponding to the slave channels to the transmission mode and the reception mode, or transmits only a transmission mode or a reception only mode. Data transmission and reception apparatus characterized in that determined by. 12. The method of claim 11, The selecting unit, characterized in that for selecting the channel having the lowest channel occupancy and the highest channel state among the analyzed channel as the master channel. The method of claim 12, The channel occupancy degree is determined by the number of users and the traffic of each channel in the searched channels, and includes access time information of the searched channels and average time information occupying the searched channels. A data transmitting and receiving device. 12. The method of claim 11, The determining unit may determine the number of antennas corresponding to the master channel and the number of antennas corresponding to the slave channels. delete The method of claim 14, When the antennas corresponding to the slave channels are equal to or greater than a preset number of antennas, the determination unit determines a modulation and coding scheme level for the highest slave channel in the rank of the slave channels, And when the antennas corresponding to the slave channels are less than or equal to the preset number of antennas, the switching unit determines the antennas corresponding to the slave channels as the transmission only mode and the reception only mode. 17. The method of claim 16, And the switching unit determines to switch the antenna corresponding to the highest slave channel to the transmission mode and the reception mode. 12. The method of claim 11, The reception-only mode, the channel transmission of the channel through the channel selection filtering, the transmission-only mode, the data transmission and reception apparatus, characterized in that for transmitting data in the combined multiple channels by combining adjacent channels. 12. The method of claim 11, The determining unit, when there is one antenna corresponding to the slave channels, the data transmission and reception device, characterized in that for comparing the channel occupancy of the slave channels with a predetermined channel occupancy. 20. The method of claim 19, When the channel occupancy of the slave channels is greater than the preset channel occupancy, the switching unit determines the antenna corresponding to the slave channels as the reception only mode, and the channel occupancy of the slave channels is greater than the preset channel occupancy. And if it is small, determining to switch the antennas corresponding to the slave channels to the reception mode and the transmission mode.

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