KR100757862B1 - Wireless network system and communication channel setting method - Google Patents

Abstract

The present invention relates to a wireless network system and a method for setting a communication channel of the system, and transmits a probe message to the at least one access point for channel detection in use by at least one access point located in a range. It is to set the channel for communication with at least one terminal located in the service area by using the channel interval and the number of times of use of the channel information included in the probe response message received from the access point of the.

Description

Wireless network system and communication channel setting method of the system {WIRELESS NETWORK SYSTEM AND METHOD FOR SETTING COMMUNICATION CHANNEL THEREOF}

1 is a diagram showing a connection configuration of a wireless network system to which the present invention is applied.

2 is a block diagram of an access point according to an embodiment of the present invention.

Figure 3 is an illustration of the channel interval and the frequency of use for the channels being used in the peripheral access point for the communication channel setting according to the present invention.

4 is a diagram illustrating a communication channel setting flow of a wireless network system according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

200: channel change control unit 202: channel analysis unit

204: channel changing unit 210: wireless transceiver

The present invention relates to a wireless network system and a communication channel setting method of the system.

In general, terminals such as a personal computer, a personal digital assistant, a notebook computer, and the like are connected to a local area network (hereinafter referred to as "LAN") and share various types of data or information with each other.

Such a LAN system may be classified into a wired LAN system and a wireless LAN system according to whether a terminal can be moved.

The wired LAN system shares information and resources in a fixed place through a cable, which is inconvenient to move because it is connected by wire, and requires professional cable work during installation. In addition, the wired LAN system takes a long time to maintain, causing many inconveniences such as interrupting work.

A wireless LAN system refers to a system that performs communication between terminals through a wireless medium by using radio frequency or optical.

This wireless LAN system has been developed in recent years due to the rapid development of Internet service and wireless communication technology. It is installed in a place where wired network is not easy to establish, maintenance and repair such as network connection between buildings or large office or distribution center. Because of its simplicity, its use is soaring.

A wireless LAN system is composed of an access point and a station.

An access point is a device that transmits radio waves so that wireless LAN users within a transmission distance can use the Internet connection and network, and act as a base station of a mobile phone or a hub of a wired network.

Wireless high-speed Internet service provided by an ISP (Internet Service Provider) also has an equipment called an access point in the service area.

The station must be equipped with a wireless LAN card in order to perform wireless network communication, and there are terminals such as a PC (including a laptop) or a PDA.

The most common wireless LAN standard used today is IEEE 802.11, which stands for "Standard for Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements-Parts 11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY). ) Specifications follow the 1999 edition.

The basic building block of the network proposed in the IEEE 802.11 standard is a basic service set (hereinafter referred to as "BSS").

In IEEE 802.11 networks, Independent BSS (Independent BSS), which directly communicates with stations within a BSS, and the Infrastructure BSS, in which an access point is involved when a station in a BSS communicates with a station inside or outside the BSS. ) And an extended service set that extends a service area by connecting a BSS and a BSS.

The wireless LAN system uses the 2.4 ~ 2.4835GHz ISM (Industrial, Scientific, and Medical) band defined by IEEE 802.11b.

The 2.4 to 2.4835 GHz frequency band is divided into 22 MHz per channel and has 13 channels.

By the way, the channel of the frequency band prescribed | regulated by IEEE 802.11b does not require permission.

That is, the 802.11b standard wireless network device (station, access point, etc.) can use the frequency channel of the 2.4 ~ 2.4835GHz frequency band without permission.

Thus, interference may occur between frequency channels that wireless network devices use for communication. As a result, communication quality through a specific channel may be degraded.

As a method for preventing communication quality degradation due to such channel interference, the following methods have been proposed.

First, a method of providing a channel with less interference to the access point by providing a server that collects all channel information in use in the BSS of one or more access points.

Secondly, the access point is a method of avoiding the interference generated between the channels by examining the packet transmission interval (duration) for each channel in use in its BSS.

This second method uses a larger number of access points using a channel with a larger packet transmission interval.

Third, the access point manages each channel information being used in its BSS as a table, and selects a channel with less interference between channels according to a set algorithm.

In the first method, a communication channel to be used in all access points is selected by the server and provided to the access point. Therefore, the access point does not have to perform an operation for selecting a channel with less channel interference.

However, in the case of the first method, since a separate server must be provided, a problem arises in that a configuration cost of the wireless network system is much used.

In the case of the second and third methods, there is a disadvantage in that the access point is heavily loaded to find a channel with low interference.

Accordingly, the present invention is to solve the above problems, and to provide a wireless network system and a communication channel setting method of the system to reduce the load of the access point generated when the channel setting with less channel interference.

Another object of the present invention is to provide a wireless network system and a communication channel setting method of the system in which channel setting with low channel interference is made by an access point without using a separate server.

An access point according to an aspect of the present invention for achieving the above object, and transmits a probe message to the at least one access point for channel identification in use in at least one access point located in a range, the at least one And a channel setting controller configured to set a channel for communication with at least one terminal located in a service area by using channel intervals and channel usage times between channel information included in a probe response message received from an access point.

The channel setting controller transmits the channel information being used to the at least one access point according to the channel information request being used from the at least one access point.

The channel setting controller checks the largest channel interval among the channel intervals of the channel information included in the probe response message, and selects a channel having the least number of times of use in at least one channel forming the largest channel interval. It is preferable to set the channel for communication with at least one terminal located within.

A wireless network system according to an aspect of the present invention for achieving the above object, and transmits a probe message to the at least one access point for channel detection in use at least one access point located in a range, the at least one An access point configured to transmit a channel for communication with at least one terminal located in a service area by using channel intervals and channel usage times between channel information included in a probe response message received from an access point of the access point; And at least one terminal for setting a channel for communication with the access point using the channel information received from the access point.

In the wireless network system according to another aspect of the present invention, the access point transmits the channel information being used to the at least one access point according to the channel information request being used from the at least one access point.

In the wireless network system according to another aspect of the present invention, the access point checks the largest channel interval among the channel intervals of the channel information included in the probe response message, and at least one channel forming the largest channel interval. It is preferable to set the channel having the lowest number of times of use as a channel for communication with at least one terminal located in the service area.

In accordance with an aspect of the present invention, there is provided a method of setting a communication channel of an access point, the method comprising: transmitting a probe message to the at least one access point to identify a channel being used by at least one access point located in a predetermined range; step; And setting a channel for communication with at least one terminal located in a service area by using channel intervals and channel usage times between channel information included in probe response messages received from the at least one access point.

The method of setting a communication channel of an access point according to an aspect of the present invention further includes transmitting channel information being used to the at least one access point according to a channel information request being used from the at least one access point. It is preferable.

In accordance with another aspect of the present invention, there is provided a method for setting a communication channel of an access point, the method comprising: transmitting a probe message to an access point located in a predetermined range to identify a channel being used by the access points located in a predetermined range; step; Checking the largest channel interval among channel intervals of the channel information included in the probe response message; And setting and transmitting a channel having the least number of times of use in at least one or more channels forming the largest channel interval as a channel for communication with at least one terminal located in the service area.

In accordance with an aspect of the present invention, there is provided a method for setting a communication channel in a wireless network system including at least one access point and a terminal, wherein the first access point is a second to Nth access point located in a predetermined range. Transmitting a probe message to the second to Nth access points to identify a channel being used in the UE; The first access point is a channel for communication with at least one terminal located in a service area by using channel intervals and channel usage times between channel information included in probe response messages received from the second to Nth access points. Setting and transmitting; And at least one terminal located in a service area of the first access point, establishing a channel for communication with the first access point using channel information received from the first access point.

In a method of setting a communication channel in a wireless network system according to an aspect of the present invention, the first access point may use the channel information being used according to the channel information request being used from the second to Nth access points. Preferably, the method further includes transmitting to the Nth access point.

The first access point examines the largest channel interval among the channel intervals of the channel information included in the probe response message, and provides the service with the least number of times of use in the at least one channel forming the largest channel interval. It is preferable to set the channel for communication with at least one terminal located in the area.

According to another aspect of the present invention, there is provided a method for setting a communication channel in a wireless network system including at least one access point and a terminal. Transmitting a probe message to the second to Nth access points to identify a channel being used in the UE; The first access point may include: checking a largest channel interval among channel intervals between channel informations included in probe response messages received from the second to Nth access points; The first access point may include transmitting a channel having the least number of times of use in the at least one channel forming the largest channel interval as a channel for communication with at least one terminal located in the service area; And at least one terminal located in a service area of the first access point, establishing a channel for communication with the first access point using channel information received from the first access point.

Hereinafter, a wireless network system and a channel setting method of the system according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, it should be noted that the same reference numerals are given to the same elements, although belonging to different drawings for convenience of understanding.

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

As shown in FIG. 1, a wireless network system in accordance with the present invention includes one or more access points 100, 110, 112, 114.

The access point 100 broadcasts probe messages to BSS2, BSS3, and BSS4, respectively, in order to determine the frequency channels being used by the neighboring access points 110, 112, and 114.

Here, the probe message may preferably include a basic service set identification (BSSID) of the access point 100.

That is, the access point 100 includes the ID assigned to BSS1 in the probe message and broadcasts it to BSS2, BSS3, and BSS4.

As the probe message is received, at least one neighboring access point 110, 112, and 114 includes channel information, size of transmit power, frame rate, and its own BSSID in the probe response message, respectively. Transmit to the access point 100.

The access point 100 compares channel information included in probe response messages received from neighboring access points 110, 112, and 114, respectively, in response to the probe message, selects the channel with the least interference, and selects a station in the BSS1. Transmit to (102, 104).

Accordingly, the stations 102 and 104 set the channel information received from the access point 100 as a communication channel for communication between the access points 100 to perform communication.

On the other hand, each of the access point 100, as the probe message is received from the neighboring access points (110, 112, 114), the channel information being used, the size of the transmit power (Power), the frame rate, its own BSSID It is included in the probe response message and transmitted to BSS2, BSS3, and BSS4.

Each of the neighboring access points 110, 112, and 114 compares channel information included in probe response messages received from other access points, including the access point 100, and selects a channel having the least interference. Transmit to at least one station in its BSS.

2 is a diagram illustrating a block configuration of an access point according to an embodiment of the present invention.

As shown in FIG. 2, the access point according to the present invention includes a channel change controller 200 and a wireless transceiver 210.

The channel change controller 200 includes a channel analyzer 202 and a channel changer 204.

The channel analyzer 202 broadcasts a probe message to the BSS of the neighboring access point through the wireless transceiver 210 to determine the frequency channel being used by the neighboring access point.

In this case, the probe message may include a basic service set identification (BSSID) of the access point.

That is, the channel analyzer 202 broadcasts the BSSID of the access point in which the channel analyzer is installed in the probe message to the neighboring access points.

At this time, the probe message is preferably broadcast every set period.

The channel analyzer 202 compares channel information included in each probe response message received from the neighboring access points through the wireless transceiver 210 in response to the probe message, and compares the channel with the least interference with that of the access point. Set as a channel for communication with stations in the BSS.

In this case, the probe response message may include channel information being used, a magnitude of transmit power, a frame rate, and a BSSID of a neighboring access point.

Hereinafter, a channel selection having the least inter-channel interference among channel information included in probe response messages received from neighboring access points will be described in more detail with reference to FIG. 3.

As illustrated in FIG. 3, the channel analyzer 202 examines channels forming the largest channel interval by comparing channel intervals between channel information received from neighboring access points.

As shown in FIG. 3, the channel analyzer 202 has at least one or more cases where the difference in channel intervals is largest (channel interval '4' between channel 2 and 6, channel 6 and channel 10). Channel interval '4') and channel interval with the largest difference in channel interval is at least one channel among the least used channels (number of channel 2, channel 6, channel 10 Check whether channel 10 of '3' and existing channel are the same.

The channel analyzer 202 does not change the channel when the channel with the lowest number of times of use and the existing channel are the same, and the stations within the access point BSS when the channel with the lowest number of times of use are not the same as the channel. Set as the channel for communication.

That is, the channel analyzer 202 sets the channel for communication with the stations in the access point BSS using the channel interval and the number of times of use of the channel information received from the neighboring access points.

The channel changer 204 includes the communication channel set by the channel analyzer 202 in the channel change message and transmits the communication channel to the at least one station in the access point BSS through the wireless transceiver 210.

Here, the channel change message preferably includes the BSSID of the access point.

Meanwhile, as the probe message is received from the neighboring access points, the channel analyzer 202 includes the channel information, the size of the transmit power, the frame rate, and the BSSID in use in the access point in the probe response message. The wireless transceiver 210 transmits the BSSs to the neighboring access points.

4 is a diagram illustrating a communication channel setting flow of a wireless network system according to an embodiment of the present invention.

As shown in FIG. 4, the access point 402 broadcasts a Probe message to the BSS of the neighboring access points 404 to determine the frequency channel in use at the neighboring access points 404. (broad cast) to (S400).

In this case, the probe message may include a basic service set identification (BSSID) of the access point.

That is, the access point 402 includes its BSSID in the probe message and broadcasts it to the neighboring access points 404.

At this time, the probe message is preferably broadcast every set period.

As the probe message is received, neighboring access points 404 include channel information, size of transmission power, frame rate, and their BSSID in the probe response message as the probe message is received. The data is transmitted to the access point 402 (S402).

In this case, the probe response message preferably includes BSSIDs of neighboring access points 404, respectively.

The access point 402 compares the channel information included in each probe response message received from the neighboring access points 404, and sets the channel with the least interference as the channel for communication with the stations in the access point BSS. (S404).

Hereinafter, a channel selection with the least interference among channels among channel information included in probe response messages received from neighboring access points will be described in more detail.

The access point 402 compares the channel intervals between the channel information received from the neighboring access points 404 and examines the channel forming the largest channel interval.

When the difference in the channel interval is at least one or more cases, the access point 402 checks whether the channel having the lowest frequency of use and the existing channel are the same among the at least one channel forming the largest channel interval.

The access point 402 does not change the channel when the channel with the lowest number of times of use is the same as the existing channel, and communicates with stations in the access point BSS when the channel with the lowest number of times of use is not the same as the channel. Set to the channel for.

That is, the access point 402 establishes a channel for communication with the station 400 in the access point BSS by using the channel interval and the channel usage frequency of the channel information received from the neighboring access points 404. .

Thereafter, the access point 402 includes the established communication channel in the channel change message and transmits it to at least one station 400 located in its BSS (S406).

On the other hand, the access point 402 is a probe response message to the channel information, the size of the transmit power (Power), the frame transmission rate, its own BSSID and the like as each probe message is received from the neighboring access points 404 Include in and transmit to the surrounding access points (404).

Each of the neighboring access points 404 includes the access point 402 and compares channel information included in probe response messages received from other access points, selects the channel with the least interference, and selects a channel having the least interference. Transmit to at least one station.

As described above, according to the wireless network system and the communication channel setting method of the system according to the present invention, the stations in the service area by using the channel interval and the number of times of use of the channel information from the access points located in a certain range By setting the channel to communicate with the mobile station, it is possible to reduce the load on the access point generated when the channel is set up with less channel interference.

In addition, according to the wireless network system and the communication channel setting method of the system according to the present invention, the station in the service area by using the channel interval and the number of times of use of the channel information in use from the access point located in a certain range by the access point By setting up a channel for communication with each other, it is possible to prevent the channel setting with less channel interference from being made by a separate server.

Claims (14)

Transmitting a probe message to the at least one access point to identify the channel being used by at least one access point located in a certain range, and channel intervals among the channel information included in the probe response message received from the at least one access point. And a channel setting control unit configured to set a channel having the least number of times of use in the largest channels as a channel for communication with at least one terminal located in the service area. The method of claim 1, The channel setting control unit, And transmitting the channel information being used to the at least one access point according to the channel information request being used from the at least one access point. delete In a wireless network system, Transmitting a probe message to the at least one access point to identify the channel being used by at least one access point located in a certain range, and channel intervals among the channel information included in the probe response message received from the at least one access point. An access point configured to transmit a channel having the fewest number of times of use in the largest channels as a channel for communication with at least one terminal located within its service area; Wow And at least one terminal for setting a channel for communication with the access point using the channel information received from the access point. The method of claim 4, wherein The access point is, And transmitting the channel information being used to the at least one access point according to the channel information request being used from the at least one access point. delete Transmitting a probe message to the at least one access point for channel identification in use by at least one access point located in a range; Wow Among the channel information included in the probe response message received from the at least one access point, the channel having the lowest number of times of use of the channel in the channel having the largest channel interval is used as a channel for communication with at least one terminal located in the service area. A communication channel setting method of an access point comprising the step of setting. The method of claim 7, wherein And transmitting the channel information being used to the at least one access point according to the channel information request being used from the at least one access point. delete In the communication channel setting method of a wireless network system comprising at least one access point and a terminal, The first access point may include transmitting a probe message to the second to Nth access points to identify a channel being used by the second to Nth access points within a predetermined range; The first access point may include at least one channel having the lowest number of times of use of channels among the channel information included in the probe response messages received from the second to Nth access points within its service area. Setting and transmitting a channel for communication with one terminal; And At least one terminal located in a service area of the first access point comprises establishing a channel for communication with the first access point by using channel information received from the first access point. How to set communication channel. The method of claim 10, The first access point, And transmitting the channel information being used to the second to Nth access points according to the channel information request being used from the second to Nth access points. delete Transmitting a probe message to the access points located in a range to detect a channel being used by the access points located in a range; Checking the largest channel interval among channel intervals of channel information included in probe response messages received from the access points located in the predetermined range; And And setting and transmitting a channel having the least number of times of use in at least one or more channels forming the largest channel interval as a channel for communication with at least one terminal located in a service area. delete

Images