KR20090012774A - Wireless communication system and communication method thereof - Google Patents

Abstract

The present invention relates to a wireless communication system, and more particularly, to a wireless communication system and a communication method thereof capable of wirelessly communicating with an optimal communication channel in a system to which ubiquitous computing technology is applied. To this end, the present invention provides a wireless communication system for performing communication in a plurality of channels in a specific frequency band, comprising: a plurality of wireless communication devices performing a specific specific function; A radio channel controller for calculating an optimal channel based on channel state information transmitted from the plurality of radio communication devices, wherein the radio channel controller transmits a channel change request signal corresponding to the calculated optimal channel to the plurality of radio channel controllers. Transmitting to a wireless communication device, wherein the wireless communication device is configured to dynamically change and communicate with an optimal channel by the channel change request signal.

Description

Wireless communication system and communication method thereof {WIRELESS COMMUNICATION SYSTEM AND COMMUNICATING METHOD THEREOF}

The present invention relates to a wireless communication system, and more particularly, to a wireless communication system and a communication method thereof capable of wirelessly communicating with an optimal communication channel in a system to which ubiquitous computing technology is applied.

Recently, with the proliferation of wireless communication, the demand for the wireless sensor network is increasing among various applications for the wireless network. Accordingly, the low power and wireless communication method based on the IEEE 802.15.4 standard plays an important role in ubiquitous computing.

Ubiquitous computing refers to a human-centered computing environment in which computer chips are embedded in all things to optimize the invisible living environment through mutual communication. In order to realize ubiquitous, the advancement of information technology, nanotechnology, and biotechnology that can be applied to all everyday things such as home appliances, furniture, and automobiles is required.

In the ubiquitous computing, there is a wireless communication method and system using a frequency band of 2.4 GHz, and various such as WLAN, Bluetooth, RF ID, Zigbee, and the like.

Therefore, various mechanisms have been proposed for solving the coexistence problem in the 2.4 GHz frequency band.

Among them, a method for in-band channel selection is to reduce the degradation of the signal-to-noise ratio (S / N) caused by the in-band channel interference signal to satisfy the desired packet error rate. In addition, a method for out-of-band channel selection is used to reduce the degradation of the signal-to-noise ratio caused by the out-of-band channel interference signal.

Such a channel selection method can significantly reduce power consumption by an efficient transmitter power control loop by lowering the minimum detectable signal of the receiver, thereby increasing battery life.

However, the wireless communication system using the 2.4 GHz frequency band described above is optimized by the interference signals of the system using the 2.4 GHz frequency band, even though communication is performed in a frequency channel for reducing the power consumption of the transmitter. There is a problem that adversely affects the selection and allocation of channels. For this reason, there is a problem in that communication between wireless communication systems using a frequency band of 2.4 GHz is degraded and malfunctions.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless communication system and a communication method thereof capable of wirelessly communicating with an optimal communication channel in a system to which ubiquitous computing technology is applied.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication system and a communication method thereof that enable a channel to be automatically changed when a channel condition deteriorates in a system using a 2.4 GHz band.

In addition, an object of the present invention is to enable the radio channel controller to periodically measure the signal strength (strength) for each channel received from each wireless communication device, and to automatically change the communication channel of the wireless communication system according to the measured signal strength. A wireless communication system and a communication method thereof are provided.

According to an aspect of the present invention, there is provided a wireless communication system for performing communication in a plurality of channels in a specific frequency band, comprising: a plurality of wireless communication devices performing a specific specific function; A radio channel controller for calculating an optimal channel based on channel state information transmitted from the plurality of radio communication devices, wherein the radio channel controller transmits a channel change request signal corresponding to the calculated optimal channel to the plurality of radio channel controllers. And transmits to a wireless communication device, and the wireless communication device dynamically changes to an optimal channel according to the channel change request signal to communicate.

Preferably, the wireless channel controller comprises: a wireless communication unit for receiving channel state information for each channel from the plurality of wireless communication devices and transmitting a channel change request signal to the plurality of wireless communication devices; A memory in which the channel state information and a program according to automatic channel change are stored; A control unit which stores the channel state information at predetermined intervals, analyzes the stored channel state information, transmits a channel change request signal requesting a change to an optimal channel at the predetermined periodic intervals, and controls to change to the optimal channel. Characterized in that configured to include.

The wireless channel controller receives channel state information for each channel from the plurality of wireless communication devices at predetermined intervals, calculates an average value of the received channel state information, and outputs a channel change request signal based on the calculated result. And transmit to a plurality of wireless communication devices.

Preferably, when the wireless channel controller receives a response message notifying a channel change according to a channel change request signal from a plurality of wireless communication devices, the wireless channel controller changes to an optimal channel to perform communication with the plurality of wireless communication devices. If a message is not received from the plurality of wireless communication devices, the previous channel maintenance command is transmitted to the corresponding wireless communication device that has transmitted the response message, and the communication is performed by the previous channel.

Preferably, when the wireless channel controller receives a response message indicating a channel changeable state from a plurality of wireless communication devices according to a channel change request signal, the wireless channel controller changes to an optimal channel to communicate with the plurality of wireless communication devices. If the response message is not received from the plurality of wireless communication devices, it is characterized by maintaining the current channel.

In addition, the present invention for achieving the above object, the wireless communication system for performing communication in a plurality of channels in a specific frequency band, a plurality of wireless communication devices for performing a specific specific function; A radio channel controller for calculating an optimal channel in consideration of channel state information; A gateway provided between the plurality of wireless communication devices and a wireless channel controller to relay communication, the gateway communicating with the wireless channel controller to receive a channel change request signal corresponding to an optimal channel, and the wireless communication The device may change and communicate with the optimal channel dynamically by the channel change request signal from the gateway.

In addition, the present invention for achieving the above object, between a plurality of wireless communication devices performing a specific function, and the wireless communication device and a wireless channel controller for communicating in a specific frequency band and controlling the specific function A communication method, comprising: receiving, by the radio channel controller, channel state information for each channel from the plurality of radio communication devices; Transmitting a channel change request signal to the plurality of wireless communication devices to request a change to an optimal channel in consideration of the received channel state information; Determining whether a channel of a plurality of wireless communication devices has been changed by the channel change request signal, and performing communication between the plurality of wireless communication devices and a wireless channel controller using an optimal channel based on the determination result. Characterized by made.

Preferably, the step of transmitting to the plurality of wireless communication devices comprises: calculating an average value for the received channel state information; And transmitting a channel change request signal to the plurality of wireless communication devices based on the calculated average value.

Preferably, the performing of the communication between the plurality of wireless communication devices and the radio channel controller determines whether the radio channel controller receives a response message indicating a channel change according to the channel change request signal from the plurality of wireless communication devices. Making a step; When the response message indicating the channel change is received from the plurality of wireless communication devices, the wireless channel controller changing to an optimal channel to communicate with the plurality of wireless communication devices; If the response message is not received from the plurality of wireless communication devices, transmitting a previous channel maintenance command to the corresponding wireless communication device that has sent the response message; And wherein said wireless communication device comprises maintaining a previous channel and communicating with said wireless communication device by a received previous channel hold command.

Preferably, the communication between the plurality of wireless communication devices and the radio channel controller may include receiving a response message from the plurality of wireless communication devices indicating that the channel change is possible according to the channel change request signal. Determining; If the response message is received from a plurality of wireless communication devices, changing the wireless channel controller to an optimal channel to communicate with the plurality of wireless communication devices; And if it is determined that the response message is not received from the plurality of wireless communication devices, maintaining and maintaining a current channel.

As described in detail above, the present invention provides an optimal communication channel obtained by monitoring a channel state of a plurality of wireless communication devices by a wireless channel controller in a system to which ubiquitous computing technology is applied. It is effective to communicate in the optimal communication environment without interference signal generated by other system in specific frequency band used by various systems. As a malfunction of the wireless communication system does not occur, there is an effect of increasing the reliability to the user.

In addition, by performing communication in an optimal communication environment without interference signal, there is an effect that can reduce the power consumption.

In addition, it is possible to solve the frequency congestion phenomenon of various wireless communication systems in software while maintaining the existing wireless communication system, and to reduce the cost when mass-producing the product, thereby reducing the purchase cost of consumers. have.

Hereinafter, exemplary 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 and 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.

Also in the following description specific details of the wireless communication system and method of communication thereof of the present invention are shown to provide a more general understanding of the present invention. It will be apparent to one of ordinary skill in the art that the present invention may be readily practiced without these specific details and also by their modifications.

In the following description, the channel state information will be used immediately to mean a received signal strength indication (RSSI) of a channel-specific signal that the wireless channel controller receives from the wireless communication device. In addition, in the following description, an optimal channel will be used immediately to mean a frequency channel in which interference signals of other systems generated while performing communication using specific frequency bands used by various systems are excluded. The specific frequency band refers to a frequency band in which various systems are commonly used. Hereinafter, to help understand the present invention, it will be described as limited to the frequency band of 2.4GHz. Thus, in the following description, the wireless communication between the wireless channel controller and the plurality of wireless communication devices may be any one selected from WLAN, Bluetooth, RF ID, and Zigbee. .

In addition, in the following description, a wireless channel controller wirelessly controls specific functions of a plurality of wireless communication devices, and will be immediately used to mean an IPTV set-top or an integrated web pad behavior terminal. In addition, in the following description, a wireless communication device will be used immediately to mean a device for remotely performing a specific function by receiving a control signal from the radio channel controller. In addition, in the following description, the matters of signal processing (modulation / demodulation) between wireless communication systems are obvious matters, and description thereof will be omitted since it is a general technology.

On the other hand, the wireless communication system and the communication method of the present invention, when an interference signal is generated in the communication situation between a wireless channel controller and a plurality of wireless communication devices that perform a specific function by receiving a control signal from the wireless channel controller, We propose a technical configuration to perform communication by automatically switching to the excluded optimal channel. To this end, the radio channel controller receives channel state information for each channel from the plurality of radio communication devices every predetermined period. The predetermined period is set in consideration of the communication state at the time of mass production. However, the user using the wireless communication system may be set in consideration of the communication state and the frequency of use. Thus, the radio channel controller controls the channels of the plurality of wireless communication devices to be changed to the optimal channel obtained by analyzing the received channel state information. Thereafter, the radio channel controller performs communication in a communication environment in which interference signals are excluded from the plurality of radio communication devices changed to the optimal channel.

Meanwhile, as an embodiment of the present invention, in the case of a wireless channel controller having a gateway for changing a channel and performing wireless communication, wireless communication is directly performed with a plurality of wireless communication devices. However, according to another embodiment of the present invention, the gateway and the plurality of wireless communication devices perform wireless communication, and the gateway and the wireless channel controller perform wired communication. In this case, the radio channel controller is a controller rich in computing resources, calculates an optimal channel, and transmits the information about the wire to the gateway. Thus, if computing resources are abundant, the wireless channel controller may be replaced by a washing machine and a refrigerator.

1 is a schematic diagram showing the configuration of a wireless communication system according to an embodiment of the present invention. Here, mutual wireless communication between the first to n-th wireless communication devices 10a to 10n may be possible.

Referring to FIG. 1, the wireless communication system of the present invention includes first to n-th wireless communication devices 10a to 10n, a radio channel controller 100, and a gateway 200.

The first to n-th wireless communication devices (10a to 10n) is a functional module to communicate with the gateway 200 or the wireless channel controller 100 in a wireless communication scheme in a specific frequency band (for example, 2.4GHz) (Transmission / reception module and control unit) (not shown) is provided. In addition, the first to n-th wireless communication devices 10a to 10n receive a control signal from the radio channel controller 100 to perform a specific function remotely. Here, the first to n-th wireless communication devices 10a to 10n perform different functions or perform the same function. In addition, the first to n-th wireless communication devices 10a to 10n sequentially transmit channel state information for each channel to the wireless channel controller 100. The channel state information for each channel is transmitted while the first to n-th wireless communication devices 10a to 10n communicate with the wireless channel controller 100 in a specific communication scheme. Since the method of transmitting the channel state information for each channel is generally known, a detailed description thereof will be omitted. The first to n-th wireless communication devices 10a to 10n also receive a channel change request signal according to channel state information from the radio channel controller 100. Thus, the first to n-th wireless communication devices 10a to 10n change to an optimal channel to perform wireless communication with the radio channel controller 100.

The radio channel controller 100 performs radio communication with the first to nth radio communication devices 10a to 10n in a specific frequency band. In addition, the radio channel controller 100 requests transmission of channel state information for each channel of the first to nth wireless communication devices 10a to 10n through the gateway 200. Accordingly, the wireless channel controller 100 receives and stores channel state information for each channel of the first to nth wireless communication devices 10a to 10n, and considers (analyzes) the channel state information for each channel to determine an optimal channel. And transmit the channel change request signal to the first to n-th wireless communication devices 10a to 10n. The radio channel controller 100 also performs radio communication with the first to n-th radio communication devices 10a to 10n changed to the optimal channel. That is, the radio channel controller 100 receives channel state information for each channel from the first to nth wireless communication devices 10a to 10n at predetermined intervals, and calculates an average value of the received channel state information. . Therefore, the channel change request signal is transmitted to the first to n-th wireless communication devices 10a to 10n based on the calculation result, and the wireless communication is performed on the changed channel with the first to n-th wireless communication devices 10a to 10n. Do this. In this case, the wireless channel controller 100 may be integrated with a gateway 200 to be described later. When the gateway 200 is provided in the wireless channel controller 100, the wireless channel controller 100 and the first to n-th wireless communication devices 10a to 10n may directly perform wireless communication. However, as shown in FIG. 1, when the wireless channel controller 100 and the gateway 200 are separate units, the wireless channel controller 100 and the gateway 200 use a wired (eg RS232) communication scheme. Will perform. Therefore, since the need for the wireless channel controller 100 to have a wireless communication module therein is eliminated, wired communication is possible, and computing resources are abundant so that an optimal channel can be calculated in consideration of channel state information for each channel. do.

The gateway 200 relays the communication between the radio channel controller 100 and the first to n-th wireless communication devices 10a to 10n. At this time, the gateway 200 and the wireless channel controller 100 communicate based on a wired communication method. Here, the process of communicating by the wired communication method will be omitted since it is a general technology. In addition, the gateway 200 may be provided inside the radio channel controller 100 to be integrated.

Referring to FIG. 1 and FIG. 2, the operation of a wireless communication system performing wireless communication with an optimal channel for preventing channel congestion will be described below.

First, the radio channel controller 100 requests channel state information for each channel to the first to n-th wireless communication devices 10a to 10n through the gateway 200 at predetermined intervals. Then, the first to n-th wireless communication devices 10a to 10n transmit channel state information for each channel through the gateway 200 to the radio channel controller 100. Accordingly, the radio channel controller 100 receives channel state information for each channel from the first to nth wireless communication devices 10a to 10n and stores channel state information for each channel. The channel state information for each channel may be stored in the form of Cb = [q1, q2, q3 .... qn]. Where b denotes a channel number, and q1, q2, q3 .... qn denotes received signal strengths of the first to nth wireless communication devices 10a to 10n. In this case, the channel state information is preferably stored in a table of the channel state information of the first to n-th wireless communication device (10a to 10n) for each channel.

Thereafter, the radio channel controller 100 calculates an average value of the channel state information for each channel. When the channel state information is received signal strength, the lowest average value among the calculated average values, that is, the channel having the lowest received signal strength is recognized as an optimal channel.

Thus, as shown in FIG. 3, the radio channel controller 100 transmits a channel change request signal according to an optimal channel to the first to n-th wireless communication devices 10a to 10n through the gateway 200. . Accordingly, the first to n-th wireless communication devices 10a to 10n transmit a response message indicating whether the channel is changed or whether the channel is changeable through the gateway 200 to the radio channel controller 100. The radio channel controller 100 changes the channel to an optimal channel according to whether the response message is received or the content of the response message (whether the channel is changed or whether the channel is changeable). Performs wireless communication with That is, the radio channel controller 100 receives a response message from the first to n-th wireless communication devices 10a to 10n or indicates that the channel of the first to n-th wireless communication devices 10a to 10n is changed. In the case of receiving a message, the message is changed to an optimal channel to perform stable communication with the first to n-th wireless communication devices 10a to 10n. At this time, the wireless channel controller 100 notifies that the channel has been changed through an external display screen. In addition to the visual notification through the external display screen, an acoustic notification through a notification sound is also possible. However, if the response message is not received for a predetermined time or the response message notifying that the channel has been changed, the radio channel controller 100 maintains the current channel in communication, and the first to n-th wireless communication device 10a. Command to maintain previous channel to corresponding device that sent response message. When the response message indicates whether the channel can be changed by the channel change request signal, when the radio channel controller 100 receives the channel changeable response message from all the first to n-th wireless communication devices 10a to 10n. Change the first to nth wireless communication devices 10a to 10n to an optimal channel; However, if a channel change impossible response message is received from the first to n-th wireless communication devices 10a to 10n, there is no need to issue a previous channel maintenance command to the first to n-th wireless communication devices 10a to 10n. .

The internal structure of the above-described radio channel controller 100 will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing the internal configuration of a radio channel controller in FIG.

Referring to FIG. 4, the wireless channel controller 100 of the present invention includes a wireless communication unit 101, a memory 103, a control unit 105, and a display unit 107.

First, the wireless communication unit 101 receives channel state information for each channel from the first to n-th wireless communication devices 10a to 10n, and transmits a channel change request signal to the plurality of wireless communication devices. In this case, the wireless communication unit 101 operates based on a wireless communication method in a specific frequency band.

The memory 103 may be composed of a program memory and a data memory. The program memory stores programs for controlling general operations of the radio channel controller. In addition, the program memory stores a program for automatically changing a channel to communicate in consideration of channel state information of the first to nth wireless communication devices 10a to 10n according to an embodiment of the present invention. In addition, the data memory temporarily stores data generated during the execution of the programs. The data memory also stores channel state information for each channel of the first to nth wireless communication devices 10a to 10n. In this case, channel state information of the first to n-th wireless communication devices 10a to 10n is stored in a table for each channel.

The controller 105 performs a function of controlling the overall operation of the radio channel controller. In addition, the control unit 105 includes a codec for encoding and decoding signals transmitted and received according to a wireless communication method. In addition, the control unit 105 stores the channel state information received through the wireless communication unit 101 at predetermined intervals in the memory 103, analyzes the stored channel state information, and requests a change to an optimal channel. The change request signal is transmitted at the predetermined periodic intervals, and the wireless communication device is controlled to perform wireless communication with the first to n-th wireless communication devices 10a to 10n through the optimum channel. In this case, the controller 105 may include a counter for counting time to change the optimal channel at predetermined intervals.

The display unit 107 displays messages generated during program execution under the control of the controller 105. In addition, the display unit 107 displays the channel state for each channel of the first to n-th wireless communication devices 10a to 10n. In addition, the display unit 107 indicates whether the channel of the first to n-th wireless communication devices 10a to 10n is changed according to the channel change request signal. In addition, the display unit 21 may include an LCD controller, a memory capable of storing image data, and an LCD display device.

5 is a flowchart illustrating a communication method of a wireless communication system according to an exemplary embodiment of the present invention. Herein, the wireless communication system will be described under the premise that communication is performed in an optimal channel according to the communication method of the wireless communication system of the present invention. In addition, an optimal channel change to be described later may be made at a predetermined main interval.

Referring to FIG. 5, first, in step 501, the wireless channel controller 100 and the first to n-th wireless communication devices 10a to 10n communicate with each other through an optimal channel in an excellent communication environment.

During communication on the optimal channel, the wireless channel controller 100 requests channel state information for each channel from the first to n-th wireless communication devices 10a to 10n in step 503.

Accordingly, in step 505, the first to n-th wireless communication devices 10a to 10n transmit channel state information for each channel according to the channel state information request for each channel.

In step 507, the wireless channel controller 100 receives channel state information for each channel transmitted from the first to nth wireless communication devices 10a to 10n and stores channel state information for each channel in the memory 103. The channel state information for each channel is tabulated to store channel state information of the plurality of wireless communication devices for each channel.

In step 509, the radio channel controller 100 analyzes channel state information for each channel stored in the memory 103. The channel state information analysis means calculating an average value of the channel state information for each channel.

Next, in step 511, the radio channel controller 100 receives a channel change request signal for requesting a change to a channel having an optimal communication state in consideration of the average value of the calculated channel state information, from the first to nth wireless communication devices 10a to 10n. To send).

In step 513, the first to n-th wireless communication devices 10a to 10n change to an optimal channel by using the received channel change request signal, and at the same time, respond to the wireless channel controller 100 to inform whether the channel is changed. Send. However, the channel may not be changed to an optimal channel depending on the operating states of the first to n-th wireless communication devices 10a to 10n.

In step 515, the radio channel controller 100 determines whether a response message is received from the first to n-th wireless communication devices 10a to 10n. It is apparent that the response message should be received from the first to n-th wireless communication devices 10a to 10n. Accordingly, if all response messages are not received from the first to nth wireless communication devices 10a to 10n, the wireless channel controller 100 transmits a previous channel maintenance command to the corresponding wireless communication device which has transmitted the response message. When the response message notifies whether the channel can be changed, it is possible to request the channel change after confirming whether the channel can be changed from the first to n-th wireless communication devices 10a to 10n.

If the response message is not received, the wireless channel controller 100 maintains a communication channel with the first to n-th wireless communication devices 10a to 10n and performs communication in step 517.

As a result of the determination, when a response message is received, in step 519, the radio channel controller 100 automatically changes a channel to an optimal channel for communication with the first to n-th wireless communication devices 10a to 10n.

Thereafter, in step 523, communication between the radio channel controller 100 and the first to n-th wireless communication devices 10a to 10n is performed.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

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

2 is an exemplary diagram for explaining a process of channel state information according to an exemplary embodiment of the present invention.

3 is an exemplary view for explaining a channel change process according to an embodiment of the present invention.

4 is a block diagram showing the internal configuration of a radio channel controller in FIG.

5 is a flowchart illustrating a communication method of a wireless communication system according to an exemplary embodiment of the present invention.

<Description of main reference numerals in the drawings>

10a to 10n: first to n-th wireless communication device 100: radio channel controller

101: wireless communication unit 103: memory

105: control unit 107: display unit

200: gateway

Claims (22)

In a wireless communication system for performing communication in a plurality of channels in a specific frequency band, A plurality of wireless communication devices for performing unique specific functions; A radio channel controller for calculating an optimal channel based on channel state information transmitted from the plurality of radio communication devices, The radio channel controller transmits a channel change request signal corresponding to the calculated optimal channel to the plurality of radio communication devices, and the radio communication device dynamically changes to an optimal channel by the channel change request signal. Wireless communication system, characterized in that. The method of claim 1, wherein the radio channel controller, A wireless communication unit which receives channel state information for each channel from the plurality of wireless communication devices and transmits a channel change request signal to the plurality of wireless communication devices; A memory in which the channel state information and a program according to automatic channel change are stored; A control unit which stores the channel state information at predetermined intervals, analyzes the stored channel state information, transmits a channel change request signal requesting a change to an optimal channel at the predetermined periodic intervals, and controls to change to the optimal channel. Wireless communication system, characterized in that configured to include. The memory of claim 2, wherein the memory includes: And channel state information of the plurality of wireless communication devices is stored in a table for each channel. The method of claim 1 or 2, wherein the radio channel controller, Receive channel state information for each channel from the plurality of wireless communication devices at predetermined intervals, calculate an average value of the received channel state information, and generate a channel change request signal based on the calculated result. Wireless communication system, characterized in that configured to transmit to. The method of claim 1, wherein the channel state information, And a received signal strength (RSSI). The method of claim 1, wherein the radio channel controller, And a display unit for displaying channel status of each channel of the plurality of wireless communication devices and indicating whether the plurality of wireless communication devices change a channel according to a channel change request signal. The method of claim 1, wherein the radio channel controller, When receiving a response message notifying a channel change according to a channel change request signal from a plurality of wireless communication devices, change to an optimal channel to communicate with the plurality of wireless communication devices, And if the response message is not received from the plurality of wireless communication devices, transmitting a previous channel maintenance command to the corresponding wireless communication device that has transmitted the response message and communicating by the previous channel. The method of claim 1, wherein the radio channel controller, When a response message indicating a channel changeable state is received from a plurality of wireless communication devices according to a channel change request signal, communication with the plurality of wireless communication devices is performed by changing to an optimal channel. And if the response message is not received from the plurality of wireless communication devices, maintaining the current channel for communication. The method of claim 1, wherein the specific frequency band, A wireless communication system, characterized in that the frequency band of 2.4GHz. The method of claim 1, wherein the wireless communication system, Wireless communication system characterized in that any one selected from the wireless LAN, Bluetooth (Bluetooth) and RFID (RFID) and Zigbee (Zigbee) is applied. In a wireless communication system for performing communication in a plurality of channels in a specific frequency band, A plurality of wireless communication devices for performing unique specific functions; A radio channel controller for calculating an optimal channel in consideration of channel state information of the plurality of radio communication devices; A gateway provided between the plurality of wireless communication devices and a radio channel controller to relay communication; The gateway communicates with the radio channel controller to receive a channel change request signal corresponding to an optimal channel, and the wireless communication device dynamically changes to an optimal channel by a channel change request signal transmitted from the gateway. Wireless communication system, characterized in that. The method of claim 11, wherein The radio channel controller, Wireless communication system characterized in that for communicating with the gateway in a wired communication method. The method of claim 11, wherein The gateway, Receiving channel state information from the plurality of wireless communication devices by a wireless communication method, and receiving an optimal channel change request signal calculated from the channel state information from the wireless channel controller by a wired communication method. Wireless communication system. A communication method between a plurality of wireless communication devices performing a specific function and a wireless channel controller communicating with the wireless communication device in a channel in a specific frequency band and controlling a specific function, Receiving, by the radio channel controller, channel state information for each channel from the plurality of wireless communication devices; Transmitting a channel change request signal to the plurality of wireless communication devices to request a change to an optimal channel in consideration of the received channel state information; Determining whether a channel of a plurality of wireless communication devices has been changed by the channel change request signal, and performing communication between the plurality of wireless communication devices and a wireless channel controller using an optimal channel based on the determination result. Communication method of a wireless communication system, characterized in that made. The method of claim 14, Transmitting to the plurality of wireless communication devices, Storing, by the radio channel controller, the received channel state information at predetermined intervals; Analyzing the stored channel state information, and transmitting a channel change request signal to the plurality of wireless communication devices at predetermined intervals according to the analysis result. Communication method of communication system. The method of claim 14, The channel state information is, And channel state information of the plurality of wireless communication devices for each channel is stored in the wireless channel controller. The method of claim 14, Transmitting to the plurality of wireless communication devices, Calculating an average value of the received channel state information; And transmitting a channel change request signal to the plurality of wireless communication devices based on the calculated average value. The method of claim 14, The channel state information is, A communication method of a wireless communication system, characterized in that the received signal strength (RSSI). The method of claim 14, Transmitting to the plurality of wireless communication devices, And displaying, by the radio channel controller, channel status for each channel of the plurality of wireless communication devices in accordance with the received channel state information. The method of claim 14, The process of performing communication between the plurality of wireless communication devices and a wireless channel controller, Determining, by the radio channel controller, whether a response message notifying a channel change according to the channel change request signal is received from a plurality of wireless communication devices; When the response message indicating the channel change is received from the plurality of wireless communication devices, the wireless channel controller changing to an optimal channel to communicate with the plurality of wireless communication devices; If the response message is not received from the plurality of wireless communication devices, transmitting a previous channel maintenance command to the corresponding wireless communication device that has sent the response message; And the wireless communication device maintains a previous channel and communicates with the wireless communication device by a received previous channel hold command. The method of claim 14, The process of performing communication between the plurality of wireless communication devices and a wireless channel controller, Determining, by the radio channel controller, whether a response message indicating that the channel change is possible is received from a plurality of wireless communication devices according to the channel change request signal; In response to the response message being received from a plurality of wireless communication devices, changing the wireless channel controller to an optimal channel to communicate with the plurality of wireless communication devices; And if it is determined that the response message is not received from the plurality of wireless communication devices, maintaining the current channel to communicate with the wireless communication system. The method of claim 14, wherein the wireless communication system, Communication method of a wireless communication system, characterized in that any one selected from a wireless LAN, Bluetooth (Bluetooth) and RFID (RFID) and Zigbee (Zigbee) is applied.

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