KR100863487B1 - Wireless local area network access point using public computer device and method for emboding the same - Google Patents

Abstract

The present invention relates to a wireless LAN access point and a method for implementing the same, using a general-purpose computer as a general-purpose computer device to easily perform the functions of the access point as well as to expand the function of the access point without requiring a separate hardware configuration. will be.

A wireless LAN access point and an implementation method thereof implemented as a general-purpose computer device according to the present invention may be implemented as a general-purpose computer device wirelessly communicating with a plurality of user computers to perform a bridging operation for a wired network connection of a user computer. The computer device includes a wireless LAN card having a wireless medium access control (MAC) to wirelessly communicate with the user computer, a wired LAN card having a wired medium access control (MAC) to communicate with a wired network, and a wired network of the user computer. Wireless MAC (Medium Access Control) frame transmitted from the user computer while performing connection authentication of the user computer, bridging between a wireless network and a wired network, forming a cell for wireless LAN communication, roaming function between cells, and the like so as to make a communication connection with the user computer. By checking the frequency of data transmission errors, the number of data transmission errors exceeds the standard value. In the case of fishing vessels, the program unit is provided with an access point program for controlling wireless power transmission to each user computer by increasing its wireless power and lowering its wireless power when the number of data transmission errors is lower than the reference value. DHCP is configured to set Internet access information including IP (Internet Protocol), gateway, and DNS (Domain Name Server) information for Internet access, and to assign IP (Internet Protocol) to the user computer authenticated according to the operation of the program unit. (Network Set) to perform Dynamic Host Configuration Protocol (NAT) and Network Address Translation (NAT) functions, SSID (Service Set IDentifier) and WEP (Wired Equivalency Privacy) used to authenticate the user computer according to the access authentication routine of the program unit. Network authentication information storage unit storing the key information, the program unit Medium access control (MAC) address information of each node collected according to the routing routine, port state information of the corresponding communication port, and transmission path information of wired / wireless medium access control (MAC) frame data according to Spanning Tree Algorithm (STA) processing And a filtering information storage unit for storing the Internet access information storage unit for storing the Internet access information.

Description

Wireless local area network access point using public computer device and its implementation method {Wireless local area network access point using public computer device and method for emboding the same}

1 is a block diagram showing the configuration of a conventional WLAN system.

Figure 2 is a block diagram showing the configuration of a wireless LAN system according to the present invention.

Figure 3 is a functional block diagram functionally showing the configuration of a wireless LAN access point implemented by a general-purpose computer device according to the present invention.

4 is a data configuration diagram showing a structure of wired MAC frame data of IEEE 802.3;

5 is a data configuration diagram showing a structure of wireless MAC frame data of IEEE 802.11;

6 is a flow chart briefly illustrating a bridging process between a wireless network and a wired network according to the present invention.

7 is a protocol hierarchy diagram for explaining the operation of a wireless LAN access point implemented by a general-purpose computer device according to the present invention.

8 is a flowchart illustrating the operation of a WLAN access point implemented by a general-purpose computer device according to the present invention.

9 is a view for explaining a roaming operation of a wireless LAN access point implemented by a general-purpose computer device according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10 (10 ₁ ~ 10 _n ): user computer, 20: access point,

30: hub, 40: router,

50: network operator server, 100: computer device,

110: program unit, 111: bridging processing block,

113: logical link control block, 115: access point management block,

120: network authentication information storage unit, 130: filtering information storage unit,

140: wireless LAN card, 150: wired LAN card,

160: network connection unit, 170: Internet connection information storage unit.

The present invention relates to a WLAN access point, and in particular, a cell of an access point is formed using a general-purpose computer, roaming between cells, bridging between a wired LAN and a wireless LAN without requiring a separate hardware configuration. The present invention relates to a wireless LAN access point implemented by a general-purpose computer device capable of easily performing bridging, power control and authentication functions of wireless stations, and an implementation method thereof.

In general, a wireless local area network (WLAN) (hereinafter referred to as a 'wireless LAN') transmits and receives data between a computer and a computer or another communication system using a radio frequency (RF) / infrared ray. Speaks LAN to perform wirelessly.

In the conventional wired LAN, since computers constituting a network are connected through a UTP cable and a hub, there is a problem in that cable wiring is difficult as well as expansion of an effective space in a building. The wireless LAN solves the problems of the wired LAN by wirelessly establishing a LAN environment of computers. The use of such wireless LANs is rapidly increasing in places where wired networks are not easy to build, such as building networks between buildings, large offices, and logistics centers.

1 is a block diagram showing the configuration of a conventional WLAN system.

In FIG. 1, reference numeral 10 (10 ₁ to 10 _n ) denotes a plurality of user computers used by a wireless LAN user, which is a universal personal computer memory card international association (PCMCIA) communication port or a peripheral component interconnect (PCI) slot. In general, such as a laptop computer, a desktop computer or a personal digital assistant (PDA) equipped with a wireless LAN card that supports a wireless MAC is installed.

In FIG. 1, reference numeral 20 denotes bridging between a wireless network and a wired network, cell formation, and roaming between cells to communicate with a plurality of user computers 10 and a hub 30 so as to relay wireless LAN communication of the user computer 10. An access point that performs a function.

The access point 20 of FIG. 1 generally includes a predetermined WLAN chipset (Chip Set) and an ASIC controller (not shown) for performing the above functions. In FIG. 1, reference numeral 30 denotes a hub, 40 denotes a router, and 50 denotes a network operator server for providing Internet (1) access service to a user. The network operator server 50 may be linked with the access point 20 to perform an authentication operation for accessing the Internet 1 of the user computer 10.

Hereinafter, the operation of the conventional WLAN system having the configuration of FIG. 1 will be briefly described.

When the Internet 1 is connected, the WLAN card of the user computer 10 of FIG. 1 performs data link processing such as securing a communication channel according to a wireless LAN standard (eg, IEEE 802.11b), and access point 20. Receives the SSID (Service Set IDentifier) and the WEP (Wired Equivalency Privacy) key information (hereinafter referred to as “network authentication information”) of the user computer 10 to perform the connection authentication operation of the user computer 10. The Internet of the user computer 10 is then used by using predetermined Internet Protocol (IP), Gateway, and Domain Name Server (DNS) information (hereinafter referred to as "Internet connection information") of the user computer 10. (1) IP allocation (flow / fixed IP) processing for access is performed.

In addition, the access point 20 of FIG. 1 bridges the wireless LAN port to which the user computer 10 is connected and the wired LAN port connected to the Internet 1, and the user computer 10 accesses the access point 20. Is connected to the Internet 1 via the path of the hub 30 and the router 40.

In addition, a plurality of user computers 10 located in a cell formed by the access point 20 of FIG. 1 set an Ad-Hoc / Peer to Peer communication mode among unique functions of a WLAN card. Depending on the function, they are connected to each other to perform data transmission and reception. In this case, the network authentication information of the plurality of user computers 10 constituting the ad-hook / peer-to-peer network is set the same.

Although the access point 20 used in the above-described conventional WLAN system is implemented through a WLAN chipset and an ASIC controller (not shown), the access point 20 has an advantage of having a compact configuration, but in the form of a one chip type. In order to aggregate bridging between a wired LAN and a wireless LAN, cell formation, and roaming function between cells in an ASIC controller (not shown), a manufacturing cost of the access point 20 may increase.

In addition, since the conventional access point 20 is made of hardware, functions related to user authentication and security of the user, power control of the user computer 10 connected to the wireless network (in particular, control of wireless power transmitted from the WLAN card) When new functions such as) are improved / added, there is a problem of redesigning the internal ASIC controller.

SUMMARY OF THE INVENTION The present invention was created to solve the above problems, and requires the use of a general-purpose computer to form a cell of an access point, roaming between cells, bridging between a wired LAN and a wireless LAN, and power control and authentication functions of a wireless station without a separate hardware configuration. An object of the present invention is to provide a wireless LAN access point and a method for implementing the same, which are implemented by a general-purpose computer device capable of easily performing the operation.

Wireless LAN access point implemented by a general-purpose computer device according to the present invention for achieving the above object is implemented as a general-purpose computer device for performing a bridging operation for a wired network connection of the user computer by wirelessly connected to a plurality of user computers, The general purpose computer device includes a wireless LAN card having a wireless medium access control (MAC) to wirelessly communicate with the user computer, a wired LAN card having a wired medium access control (MAC) to communicate with a wired network, and the user computer. Wireless MAC (Medium Access Control) transmitted from the user computer while performing connection authentication of the user computer, bridging between the wireless network and the wired network, forming a cell for wireless LAN communication, roaming function between the cells, and the like so as to make a communication connection with a wired network. ) Check the transmission error frequency of frame data to The program unit includes an access point program for controlling wireless power transmission to each user computer by increasing wireless power when exceeding a reference value and lowering wireless power when the number of data transmission errors is lower than a reference value. DHCP is configured to set Internet access information including IP (Internet Protocol), gateway, and DNS (Domain Name Server) information for Internet access, and to assign IP (Internet Protocol) to the user computer authenticated according to the operation of the program unit. (Network Set) to perform Dynamic Host Configuration Protocol (NAT) and Network Address Translation (NAT) functions, SSID (Service Set IDentifier) and WEP (Wired Equivalency Privacy) used to authenticate the user computer according to the access authentication routine of the program unit. Network authentication information storage unit storing the key information, the program unit Transmission path of wired / wireless medium access control (MAC) frame data according to medium address control (MAC) address information of each node collected according to the bridging routine of the node, port state information of the corresponding communication port, and spanning tree algorithm (STA) processing And a filtering information storage unit for storing information and an internet access information storage unit for storing the Internet access information.

In addition, a wireless LAN access point implementation method implemented by a general-purpose computer device according to the present invention for achieving the above object is connected between a wireless network and a wired network and the transmission and reception of the first and second frame data conforming to the standards of each network; An access point implementation method implemented by a general-purpose computer device for performing a related bridging operation, the method comprising: checking a source and destination medium access control (MAC) address of the first frame data and a communication port operation state of a source and a destination; A learning process step of databaseting MAC (Medium Access Control) addresses and port state information of all nodes wirelessly / wired to the device, and a loop occurs when the first frame data is transmitted according to the result of Spanning Tree Algorithm (STA) processing. Filtering processing step to database transmission path information that has been removed, MAC (Medium Access Control) A data conversion processing step of converting a data format of the first frame data into the second frame data by modifying a header field, and a medium access control (MAC) address and port state information for each node collected according to the learning processing step; And a forwarding processing step of determining a forwarding port based on the information and the transmission path information set according to the filtering processing step, and transmitting the second frame data to a MAC (Medium Access Control) address of a corresponding destination. It is done.

In addition, a method for implementing a WLAN access point using a general purpose computer device according to the present invention for achieving the above object is an access point implementation method implemented by a general purpose computer device connected to a wireless network and a wired network to perform a bridging operation, Setting network authentication information including Service Set IDentifier (SSID) and Wired Equivalency Privacy (WEP) key information to a plurality of user computers wirelessly connected to the general purpose computer device, wherein the general purpose computer device forms a cell; Confirming the network authentication information set in the user computer to permit / deny the communication connection to a wireless network; when the communication connection of the user computer is permitted, the general purpose computer device is configured to perform an IP (for IP connection) of the user computer. Internet Protocol), wherein the general purpose computer device Collecting the MAC (Medium Access Control) address information and collecting and storing the port state information of the corresponding communication port, the universal computer device is a wireless / wired MAC (Medium Access Control) frame transmitted from the user computer or a wired network Checking transmission error of data and performing flow control; and setting, by the general purpose computer apparatus, STA processing on received wireless / wired medium access control (MAC) frame data to set transmission path information without a loop And converting, by the general purpose computer device, a header field of received wireless / wired medium access control (MAC) frame data and converting a data format into frame data of a transmission target network, wherein the general purpose computer device converts a data format of the transmission target network. Forwards the frame data converted into the destination MAC (Medium Access Control) address. And further characterized in that made in a step of performing a transmission error check and flow control of the data frame in which the general-purpose computer device is forwarded.

Therefore, according to the above configuration, a wireless LAN access point implemented by a general-purpose computer device that facilitates the expansion of the function of the access point as well as performing the operation of the conventional access point using a general-purpose computer without requiring a separate hardware configuration and its It is possible to provide a method of implementation.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a configuration of a wireless LAN system according to the present invention. In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.                     

In FIG. 2, reference numeral 100 denotes bridging according to the IEEE 802.1d standard between a wireless network and a wired network, cell formation for WLAN communication, and roaming between cells to connect a plurality of user computers 10 to a wired network via a wireless network. A computer device equipped with a predetermined access point program configured to perform a roaming function and the like.

The computer device 100 is a general-purpose computer such as a general desktop computer, a server, a notebook computer, and the like, and drives the access point program. In this case, the access point program is configured to operate in an operating system such as Linux, Unix, Windows 98, ME, 2000, XP, NT, and the like.

Meanwhile, although only one computer device 100 is illustrated in FIG. 2, it is also possible to provide a plurality of computer devices 100 to form a plurality of cells. In this case, each computer device 100 is connected to each other through a hub 30 or an Ethernet switch (not shown) of FIG. In this case, the user computer 10 can roam from one cell to another. The roaming operation between the cells will be described later.

FIG. 3 is a functional block diagram functionally showing the computer device 100 shown in FIG. 2. The configuration of FIG. 3 omits a general configuration of a computer device such as a microprocessor and a main board for convenience of description.

In FIG. 3, reference numeral 110 denotes a program unit 110 provided with the above access point program, which is a security / authentication related to bridging according to the IEEE 802.1d standard between a wireless network and a wired network, and a wireless network connection of a user computer 10. Bridging processing block 111 for controlling the processing, cell formation for wireless network connection of a plurality of user computers 10, inter-cell roaming as the user computer 10 moves, and wireless of the user computer 10 Logic link control block 113 for controlling power transmission operation and performing flow error check and flow control of wired / wireless medium access control (MAC) frame data, and an ad hook of a wireless LAN. -Provides screen interface for communication mode setting such as Hoc) / InfraStructure mode, communication channel setting and network authentication information setting such as SSID, WEP, and overall control of the setting operation. The access point management block 115 is configured for the purpose.

In FIG. 3, reference numeral 120 denotes a network authentication information storage unit for storing SSID and WEP key information as network authentication information, and 130, MAC address information of all nodes collected according to the operation of the bridging processing block 111; The filtering information storage unit stores port state information of a communication port through which wired / wireless MAC frame data is transmitted / received and predetermined transmission path information of wired / wireless MAC frame data collected according to STA processing to be described later.

In FIG. 3, reference numeral 140 denotes a wireless LAN card for wirelessly communicating with a plurality of user computers 10, which directly performs data transmission / reception through a wireless MAC means 141 implemented by an ASIC controller and a physical layer. And PHY means 143 for the construction. The WLAN card 140 uses a general WLAN card that supports a mixed mode (Promiscuous Mode).

In the mixed mode, wireless MAC frame data transmitted from all the wireless stations (user computer 10) of the cell formed by the computer apparatus 100 is received, and the network authentication information included in the frame data is checked to determine the frame. Refers to an operation mode for determining whether to transmit data.

In FIG. 3, reference numeral 150 is a general wired LAN card provided with a wired MAC means 151 and a PHY means 153 to communicate with a hub 30 by wire.

In FIG. 3, reference numeral 160 denotes Internet connection information such as IP, gateway, DNS information for accessing the Internet 1 of the user computer 10, and a user computer 10 having a connection request according to the Internet access information. Dynamic Host Configuration Protocol (DHCP) server and NAT (Network Address Translation) function to assign dynamic / fixed IP.

In the present embodiment, the network connection unit 160 uses a general network management program included in an operating system such as, for example, Windows or Linux. In FIG. 3, reference numeral 170 is an Internet access information storage unit for storing the Internet access information such as IP, gateway, DNS information, and the like.

Hereinafter, the bridging process between the wired network and the wireless network processed through the bridging processing block 111 will be described with reference to FIGS. 4 to 6. The WLAN system shown in FIG. 2 uses a wired MAC as well as a wireless MAC.

4 shows a structure of wired MAC frame data of IEEE 802.3, which is a preamble for synchronization of a wired LAN, a start frame delimiter (SFD) indicating a start of a frame, and a DA (destination MAC address); Destination Address), Source Address (SA) indicating the source MAC address, Length / Type (L / T) indicating the number of frames (length) / MAC type, data to be transferred, and FCS (for transmission error check). Frame Check Sequence).

FIG. 5 illustrates the structure of IEEE 802.11 wireless MAC frame data, which indicates a frame type (FC) indicating a frame type, power control, and whether a frame is encrypted, and a DU (Duration) indicating a frame occupancy time. / ID, Ad1 to Ad4 indicating address fields, SC (Sequence Control) indicating whether a frame is fragmented, data to be transmitted, and FCS for transmission error checking.

The FC includes WEP key information for authentication of the user computer 10 that is communicatively connected to the computer device 100. The address fields of Ad1 to Ad4 include SSIDs, source and destination MAC address information, which are identification IDs of cells formed by the computer apparatus 100.

That is, as shown in FIGS. 4 and 5, the MAC header field of the frame data transmitted through the wired network and the MAC header field of the frame data transmitted through the wireless network have a different structure. In order to transmit and receive frame data, a conversion process between two different MAC header fields is required, and the conversion process is performed through the bridging process block 111.

6 is a flowchart briefly illustrating a bridging process between a wireless network and a wired network. First, in FIG. 6, when the first frame data is wired MAC frame data, the second frame data is wireless MAC frame data. On the contrary, when the first frame data is wireless MAC frame data, the second frame data is wired MAC frame data. do.

The bridging process of FIG. 6 checks the source and destination MAC addresses of the first frame data received from the wireless network and the wired network, and checks the communication port operating states of the source and destination. Based on the learning process (ST1)-> Spanning Tree Algorithm (STA) processing result to database the MAC address and port status information of the node), the predetermined transmission is performed so that a loop does not occur when the first frame data is transmitted. Filtering process of converting the path information into a database (ST2)-> Data conversion process of converting the format of the first frame data into the format of the second frame data by modifying the MAC header field (ST3)-> the filtering information And a forwarding process (ST4) for determining a forwarding port and transmitting the second frame data to the corresponding destination. The.

In the learning processing step ST1, the port state information includes blocking, learning, forwarding, and disabled state information of each communication port. When the communication port is blocked or disabled, frame data transmission / reception to the corresponding communication port is blocked. In the learning state, the learning processing process ST1 is executed, and in the forwarding state, the forwarding processing process ST4 is executed. Therefore, transmission / reception of data from another communication port is blocked.

The STA processing performed in the filtering process ST2 is a process for creating a network topology of a tree structure so as to remove a loop on a communication path. Since the detailed processing is described in the IEEE 802.1 standard, the detailed description thereof will be omitted. According to the STA process, a single communication path without a loop is established between any two terminals connected to the wired / wireless network, and the communication port to which the two terminals are connected is switched to a forwarding state capable of transmitting frame data.

Hereinafter, the operation of the WLAN access point implemented by the general purpose computer device according to the present invention will be described with reference to FIGS. 7 and 9.

7 is a protocol hierarchy diagram for explaining the operation of a wireless LAN access point implemented by a general-purpose computer device according to the present invention.

In FIG. 7, reference numeral H1 is a wireless MAC layer formed by the WLAN card 140 of FIG. 3, H2 is a wired MAC layer formed by the wired LAN card 150, and S1 is formed by the bridging processing block 111. As a first data link layer, MAC address information of all nodes is collected, port state information of a corresponding communication port is collected, and an STA algorithm for bridging is performed in the first data link layer S1. Is performed. In FIG. 7, reference numeral S2 denotes a second data link layer formed by the logical link control block 113, and this layer corresponds to an LLC layer.

8 is a flowchart illustrating the operation of a WLAN access point implemented by a general-purpose computer device according to the present invention, which illustrates a bridging operation for transmitting frame data from a wireless network to a wired network.

First, the administrator of the computer device 100 sets up Internet access information such as IP, gateway, DNS information, etc. through the network connection unit 160 of FIG. 3 and also provides the predetermined access point provided through the access point management block 115 of FIG. Network authentication information, that is, SSID and WEP key of a cell formed by the corresponding computer device 100 is set using the screen interface.

Also, the user of each user computer 10 sets the same information as the SSID and WEP key information as network authentication information by using a predetermined client program provided by the manufacturer of the WLAN card / computer apparatus 100. In this case, the client program may be configured to automatically receive the network authentication information from the computer apparatus 100 (step ST801).

Thereafter, the logical link control block 113 of the computer device 100 of FIG. 3 forms one cell such that a plurality of user computers 10 are wirelessly connected through the WLAN card 140. In addition, a plurality of user computers 10 located in a cell of the computer device 100 transmit the network authentication information to the computer device 100, and the bridging processing block 111 of FIG. The network authentication information transmitted from the network authentication information is compared with the information previously stored in the network authentication information storage unit 120 of FIG. 3 to allow / deny the communication connection of each user computer 10 (step ST802).

In addition, the network connection unit 160 of the computer device 100 that permits communication connection reads Internet connection information such as IP, gateway, DNS information, etc. from the Internet connection information storage unit 170, thereby allowing a user computer (eg, communication connection) to be permitted. 10) IP is allocated for the Internet 1 connection. Therefore, each user can save the trouble of having to directly set the Internet access information on his or her user computer 10 (ST803).

Thereafter, the plurality of user computers 10 to which the IP is assigned transmit wireless MAC frame data. The bridging processing block 111 of the computer apparatus 100 of FIG. 3, which has received wireless MAC frame data in the wireless MAC layer H1 of FIG. 7, receives the wireless MAC received in the first datalink layer S1 of FIG. 7. By decapsulating the frame data, the source / destination MAC address information of all the user computers 10 connected to the communication are collected at predetermined intervals, and the operation state of the communication port of the source / destination is checked at predetermined intervals. The MAC address information of the node and the port state information of the corresponding communication port are updated and stored in the filtering information storage unit 130 of FIG. 3 (step ST804).

At this time, the logical link control block 113 in the computer device 100 of FIG. 3 checks a transmission error of wireless MAC frame data transmitted from a plurality of user computers 10 in the second data link layer S2 of FIG. Then, the flow control is performed (ST805).

In the first data link layer S1 of FIG. 7, the bridging processing block 111 of FIG. 3 executes the STA processing to set one transmission path information without generating a loop when transmitting frame data, and sets the predetermined transmission path information. Transmission path information is stored in the filtering information storage unit 130 of FIG. The transmission path information is set for each of a plurality of user computers 10 transmitting / receiving data via the Internet (step ST806).

Subsequently, in the first data link layer S1 of FIG. 7, the bridging processing block 111 of FIG. 3 replaces the wireless MAC header field (FIG. 5) of the wireless MAC frame data transmitted from the wireless network with the wired MAC header field (FIG. 4). (Step ST807)

In the first data link layer S1 of FIG. 7, the bridging processing block 111 of FIG. 3 encapsulates the frame data obtained by converting the MAC header field into wired MAC frame data to the filtering information storage unit 130. It forwards to the destination MAC address based on the stored destination MAC address, port status information, and predetermined transmission path information according to STA processing (step ST808).

In the second data link layer S2 of FIG. 7, the logical link control block 113 of FIG. 3 checks a transmission error of wired MAC frame data transmitted to a destination MAC address of the wired network, and performs the flow control. (ST809 step)

The operations of steps ST801 to ST809 illustrate a process of transmitting frame data from a wireless network to a wired network. The process of transmitting frame data from a wired network to a wireless network is performed in a reverse direction, and a detailed description thereof will be omitted.

Meanwhile, the logical link control block 113 of FIG. 3 checks the transmission error frequency of the frame data transmitted from the plurality of user computers 10 connected to the communication, and increases the wireless power when the number of data transmission errors exceeds a predetermined reference value. When the number of data transmission errors is lower than the reference value, the wireless power transmission to each user computer 10 is controlled by lowering the wireless power.

9 illustrates a roaming operation of a WLAN access point using a general-purpose computer device according to the present invention.

As shown in FIG. 9, when a user computer 10 located in a cell C _A formed by the computer device 100 _A moves to a cell C _B formed by another computer device 100 _B , the other computer device is moved. (100 _B) is the one receiving the wireless MAC frame data to the user computer 10 is transmitted, verifies the network authentication information included in the frame data.

If this time the check information is judged to be the same as the network authentication information registered in the computer device (100 _B) the computer device (100 _B) is to reassign the IP for the Internet 1 connected to the corresponding user computer 10 As a result, the user computer 10 can perform continuous data communication even when moving between different cells.

And as shown in FIG. 9, the computer device 100 _A and the computer device 100 _B forming the cells C _A and C _B are communicatively connected to each other through a hub / Ethernet switch, and the hub / Ethernet switch is not shown. It will be connected to the Internet 1 through a router.

Meanwhile, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical spirit of the present invention.

For example, the present embodiment is proposed according to the WLAN standard of IEEE 802.11b, but by replacing the WLAN card 140 of Figure 3 with a LAN card according to the IEEE 802.11a / 802.11g standard to build a wireless LAN system of the standard It is possible.

As described above, according to the present invention, there is provided a WLAN access point and a method for implementing the same, which are implemented as a general-purpose computer device that can perform operations of a conventional access point using a general-purpose computer without requiring a separate hardware configuration. It becomes possible.

In addition, according to the present invention, since the WLAN chipset and ASIC controller are not required to implement the access point, the manufacturing cost can be greatly reduced, and the access point can be easily expanded by modifying the access point program.

In addition, according to the present invention, it is possible to easily build a wireless LAN system of various standards by replacing the wireless LAN card in the computer device operating as an access point in accordance with the desired wireless LAN standard.

Claims (5)

It is implemented as a general-purpose computer device that wirelessly communicates with a plurality of user computers and performs bridging operations for a wired network connection of the user computer. The general purpose computer device includes a wireless LAN card equipped with a wireless medium access control (MAC) to wirelessly communicate with the user computer; Wired LAN card equipped with a wired MAC (Medium Access Control) to connect to the wired network, Wireless MAC transmitted from the user computer while performing connection authentication of the user computer, bridging between the wireless network and the wired network, forming a cell for wireless LAN communication, roaming function between the cells, and the like to connect the user computer to the wired network. Medium Access Control) Checks the frequency of transmission error of frame data to increase the wireless power when the number of data transmission errors exceeds the standard value, and to reduce the wireless power when the number of data transmission errors is lower than the standard value. A program unit having an access point program for controlling power transmission; Set Internet access information including IP (Internet Protocol), gateway, and DNS (Domain Name Server) information for the Internet access of the user computer, and access the user computer authenticated according to the operation of the program unit. Network connections configured to perform Dynamic Host Configuration Protocol (DHCP) and Network Address Translation (NAT) functions, A network authentication information storage unit for storing SSID (Service Set IDentifier) and WEP (Wired Equivalency Privacy) key information used for access authentication of the user computer according to the access authentication routine of the program unit; The MAC (Medium Access Control) address information of each node collected according to the bridging routine of the program unit, the port state information of the corresponding communication port, and the wired / wireless MAC (Medium Access Control) frame data according to the Spanning Tree Algorithm (STA) processing. A filtering information storage unit for storing transmission path information; Wireless access point implemented as a general-purpose computer device characterized in that it comprises an Internet access information storage unit for storing the Internet access information. The method of claim 1, The program unit bridging according to the IEEE 802.1d standard between a wireless network and a wired network, a bridging processing block for controlling security / authentication processing associated with a wireless network connection of the user computer; Cell formation for wireless network access of the user computer, inter-cell roaming according to the movement of the user computer, wireless power transmission operation of the user computer, and transmission / wireless medium access control (MAC) frame data transmission error A logical link control block for performing check and flow control; Provides screen interface for setting communication mode including ad-hook / infrastructure mode of wireless LAN, network authentication information setting including communication channel setting, Service Set IDentifier (SSID), and Wired Equivalency Privacy (WEP). Wireless access point implemented as a general-purpose computer device characterized in that it comprises an access point management block for controlling the setting operation as a whole. delete An access point implementation method implemented by a general-purpose computer device connected between a wireless network and a wired network and performing a bridging operation related to transmission and reception of first and second frame data conforming to a standard of each network, The source and destination medium access control (MAC) addresses of the first frame data and the communication port operation states of the source and destination are checked to provide medium access control (MAC) addresses and ports of all nodes wirelessly / wiredly connected to the computer device. Learning processing step to database the state information, A filtering processing step of databaseting transmission path information such that a loop does not occur when the first frame data is transmitted according to a result of Spanning Tree Algorithm (STA) processing; A data conversion processing step of converting a data format of the first frame data into the second frame data by modifying a medium access control (MAC) header field; A forwarding port is determined based on the medium access control (MAC) address and port state information for each node collected according to the learning processing step and the transmission path information set according to the filtering processing step, and the second frame data is determined. A method of implementing a WLAN access point implemented by a general-purpose computer device, comprising: forwarding a step of transmitting to a medium access control (MAC) address of a destination. An access point implementation method implemented by a general-purpose computer device connected to a wireless network and a wired network to perform a bridging operation, Setting network authentication information including SSID (Service Set IDentifier) and WEP (Wired Equivalency Privacy) key information to a plurality of user computers wirelessly connected to the general purpose computer device; Forming, by the general-purpose computer apparatus, a cell and confirming the network authentication information set in the user computer to permit / deny communication connection to a wireless network; Allocating an IP (Internet Protocol) for accessing the Internet of the user computer by the general-purpose computer device when the communication connection of the user computer is permitted; Collecting, by the general purpose computer device, MAC (Medium Access Control) address information of all nodes and collecting and storing port state information of a corresponding communication port; Checking, by the general purpose computer device, a transmission error of wireless / wired medium access control (MAC) frame data transmitted from the user computer or a wired network, and performing flow control; Setting up transmission path information without a loop by performing STA processing on the received wireless / wired medium access control (MAC) frame data; Converting, by the general purpose computer device, a header field of received wireless / wired medium access control (MAC) frame data to convert a data format into frame data of a transmission target network;  Forwarding, by the general purpose computer device, frame data converted into a data format of a transmission target network to a destination medium access control (MAC) address; And performing the transmission error check and flow control of the forwarded frame data by the general purpose computer device.

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