KR20090124282A - Mobile router for connecting heterogeneous network and method for connecting heterogeneous network in the mobile router - Google Patents

Abstract

PURPOSE: A mobile router and a network access method of the router capable of accessing heterogeneous network are provided to reduce expense installing a mobile router in the heterogeneous network by supplying the mobile router. CONSTITUTION: A storing unit(121) stores an IP(Internet Protocol) pool and an access network gateway address. A communications unit(123) receives data from a terminal acquiring a service set identifier and broadcasts a plurality of service set identifiers. A controller(124) extracts the heterogeneous gateway address of the storing unit and extracts the access network gateway address corresponding to the set identifier. If the connection request is received from the terminal, the controller assigns the IP address of the terminal with reference to the IP pool.

Description

Mobile router capable of connecting heterogeneous networks and network connection method in the router {MOBILE ROUTER FOR CONNECTING HETEROGENEOUS NETWORK AND METHOD FOR CONNECTING HETEROGENEOUS NETWORK IN THE MOBILE ROUTER}

The present invention relates to a mobile router, and more particularly, to a mobile router that simultaneously accesses heterogeneous networks such as WiBro networks, CDMA networks, and HSDPA networks.

Due to the spread of wireless communication terminals and the development of mobile communication networks, the use of the mobile Internet accessing homepages, blogs, etc. using wireless communication terminals is rapidly increasing. In addition, terminals such as laptops and PDAs (Personal Digital Assistants) equipped with wireless LAN modules are provided with high-speed data services in places where wireless Internet access is possible.

Since the wireless LAN module transmits and receives data through RF (Radio Frequency) signals rather than conventional cables, it is widely used in places where wired networks such as large offices, distribution centers, cafes, etc. are difficult to establish. When accessing the Internet using the WLAN module, a user's terminal generally accesses the Internet network through a mobile router which is a WLAN access point.

Meanwhile, a vehicle mobile router installed in a train, a vehicle, and the like to provide an Internet service to a user has been disclosed. The on-vehicle mobile router allows a user to access the Internet even in a fast moving vehicle or train.

The mobile routers, however, are grouped into one sub-network and only connected to one specified network. That is, the mobile router provides a service connected to only one of a wireless broadband (WiBro) network, a high speed downlink packet access (HSDPA) network, and a code division multiple access (CDMA) network.

Therefore, in order to support all different heterogeneous networks in places such as vehicles, trains, distribution centers and cafes, mobile routers in charge of each network must be separately installed. However, this method increases the installation cost of the mobile router.

The present invention has been proposed to solve the above problems, and an object thereof is to provide a mobile router for accessing a heterogeneous network such as an HSDPA network, a CDMA network, a WiBro network, and a heterogeneous network access method in the mobile router.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to the first aspect of the present invention for achieving the above object, a mobile router for simultaneous access to a heterogeneous access network based on a service set identifier for distinguishing a network includes an IP pool and an access network gateway corresponding to each service set identifier. A storage unit for storing an address; A communication unit that broadcasts a plurality of service set identifiers and, accordingly, receives data from a terminal that has obtained any one service set identifier; And a control unit which extracts an access network gateway address corresponding to the service set identifier obtained by the terminal from the heterogeneous gateway address of the storage unit, and transmits the data to the access network gateway.

In the mobile router for simultaneous access to a heterogeneous access network according to the second aspect of the present invention for achieving the above object, a table in which an IP pool and a heterogeneous access network gateway address are stored corresponding to each service set identifier for distinguishing a network. A method for accessing a heterogeneous network based on (a) receiving data from a terminal and confirming a service set identifier added to the data; (b) extracting an access network gateway address corresponding to the service set identifier from the heterogeneous access network gateway addresses in the table; And (c) transmitting the received data to the extracted access network gateway address.

The present invention provides a mobile router that can be simultaneously connected to a heterogeneous network, thereby reducing the cost of installing a mobile router in charge of each network at a place where a heterogeneous network needs to be connected.

In addition, the present invention provides a method for constructing a heterogeneous network topology, thereby increasing mobile router effectiveness.

In addition, the present invention provides a heterogeneous network interface for each constructed sub-network, and at the same time, blocks access between terminals belonging to different sub-networks, thereby improving the complementarity of the communication network.

In particular, according to the present invention, a user having a wireless communication terminal can selectively connect to any one of a plurality of heterogeneous access networks through a mobile router.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a state connected to a plurality of heterogeneous networks in a mobile router according to an embodiment of the present invention.

Referring to FIG. 1, the wireless communication terminal 110 selects one of the HSDPA network 130, the CDMA network 140, and the WiBor network 150 through the mobile router 120, and access network 130, 140. , 150). That is, the wireless communication terminal 110 obtains any SSID of a plurality of SSIDs (Service Set Identifiers) that are broadcasted from the mobile router 120 and records the SSID in the header of the packet, thereby the mobile router 120 ) May transmit the packet to the access network (130, 140, 150). The wireless communication terminal 110 is a PDA (110a), a notebook (110b), a general purpose computer (110c) having a wireless LAN module, and the like, and wirelessly communicates with the mobile router 120 through the wireless LAN module.

The mobile router 120 is connected to the HSDPA network 130, CDMA network 140, WiBro network 150 and the like, and connects the wireless communication terminal 110 and the access network (130, 140, 150). In addition, the mobile router 120 assigns an IP address of the wireless communication terminal 110, and when a packet transmission is received from the wireless communication terminal 110, based on the SSID recorded in the header of the packet, a specific access network ( 130, 140, 150). In this case, the mobile router 120 may assign the IP address of the wireless communication terminal 110 as a private IP address, and when the packet is transmitted to the access network 130, 140, 150, the mobile router 120 assigns the private IP address to the access network ( 130, 140, and 150 may be changed to a commonly used IP address.

The HSDPA network 130 includes a NodeB, a Radio Network Controller (RNC), a Serving GPRS Support Node (SGSN), a Gateway GPRS Support Node (GGSN), and the like. The NodeB manages radio signal transmission and reception, signal strength measurement, radio resources, and the like, and the RNC performs radio channel assignment and release, intercell handoff, transcoding, vocoding, and the like. In addition, the SGSN performs packet forwarding, security, access control, and the like, and the GGSN serves as a gateway to the external network.

The CDMA network 140 performs a base station controller (BTS) and a packet data serving node (PDSN) to perform a base station transceiver subsystem (BTS) that performs radio signal transmission and reception, radio resource management, and the like. And the like. The CDMA network may be a CDMA EV-DO (Evolution-Data Optimized) network capable of transmitting and receiving high-speed data.

The WiBro network 150 includes a Radio Access Subsystem (RAS) that manages terminal resources, takes charge of control, and performs handoff functions, and an Access Control Router (ACR) that manages IP routing and mobility.

The HSDPA network 130, the CDMA network 140, and the WiBro network 150 are connected to the Internet network 160.

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

3 is a diagram illustrating a table referenced by a mobile router according to an embodiment of the present invention.

2 and 3, the mobile router 120 according to an embodiment of the present invention includes a storage unit 121, an internal communication module 122, an external communication module 123, and a controller 124. .

The storage unit 121 stores a table in which session information and routing information are recorded. The table includes the virtual LAN ID 301, the IP pool 302, the SSID 303, the subnet mask information 304, the gateway address 305 of the heterogeneous network, and the interface 306 of the access network 130, 140, or 150. ), The IP address 307 and the external IP address 308 allocated to the wireless communication terminal 110 are mapped and recorded.

The virtual LAN ID 301 distinguishes a sub network generated by the mobile router 120, and each IP pool 302 records a plurality of IP addresses that can be allocated for each virtual LAN 301. The IP address of the IP pool 302 may be a private IP or a public IP address.

The SSID 303 is a type of network name assigned to each virtual LAN 301. A plurality of SSIDs 303 recorded in the table are broadcast periodically. Meanwhile, the SSID 303 may be set to the hidden mode, in which case the SSID 303 of the hidden mode is not broadcast. Accordingly, the wireless communication terminal 110 that wants to connect to the access network 130, 140, 150 corresponding to the SSID in the hidden mode transmits the SSID input by the user to the mobile router 120.

The subnet mask 304 indicates subnet mask information set for each virtual LAN 301. The gateway address 305 represents the gateway address of the access network 130, 140, 150 to which the packet received from the wireless communication terminal 110 is delivered. The interface 306 represents a communication method of the access network 130, 140, 150 to which the gateway belongs, and the external IP address 308 represents an IP address commonly used in the access network 130, 140, 150 to which a packet is transmitted. . The external IP address is a public IP commonly used in the corresponding access network (130, 140, 150) or a private IP in the access network (130, 140, 150), a plurality of can be recorded for each virtual LAN (301).

Meanwhile, the gateway address may not be recorded in the gateway address 308. If the gateway address is not recorded, the wireless communication terminal 110 that selects the corresponding SSID (eg, KTF_adhoc1 of FIG. 3) may transmit and receive packets by configuring a network in an ad hoc network method. Only packets can be sent and received internally.

The internal communication module 122 performs communication with the wireless communication terminal 110. That is, the internal communication module 122 broadcasts all SSIDs except the SSID set to the hidden mode among the SSIDs recorded in the storage 121 and receives a connection request from the wireless communication terminal 110 in which one of the SSIDs is selected. . In addition, the internal communication module 122 receives a packet from the wireless communication terminal 110 assigned an IP. On the other hand, the internal communication module 122 may receive the SSID directly input by the user from the wireless communication terminal 110.

The external communication module 123 includes an HSDPA module 123a communicating with the HSDPA network 130, a CDMA module 123b communicating with the CDMA network 140, and a WiBro module 123c communicating with the WiBro network 150. do. That is, the external communication module 123 transmits the packet to the access networks 130, 140, and 150 corresponding to the SSID of the packet transmitted from the wireless communication terminal 110 under the control of the controller 124.

The controller 124 controls the components of the mobile router 120. In particular, the controller 124 broadcasts the SSID excluding the hidden mode among the SSIDs 303 recorded in the table of the storage 121 through the internal communication module 122. When the connection request is received from the wireless communication terminal 110 that selects one of the broadcasted SSIDs, the control unit 124 receives the IP pool 302 of the storage unit 121 corresponding to the SSID 303. Based on the IP of the wireless communication terminal 110 can be assigned. That is, the controller 124 may extract an unassigned IP address from the IP pool 302 corresponding to the SSID 303 and assign it as the IP address of the wireless communication terminal 110.

In addition, when the control unit 124 receives the SSID directly input by the user in the internal communication module 122, the controller 124 checks whether an SSID corresponding to the received SSID exists in the table of the storage unit 121, and if it exists, The IP of the wireless communication terminal 110 may be allocated by referring to the IP pool corresponding to the SSID.

In addition, when the control unit 124 receives the packet from the wireless communication terminal 110 in the internal communication module 122, the controller 124 checks the SSID recorded in the header of the packet, and the gateway address 305 corresponding to the SSID 303. ) Is extracted from the table of the storage unit 121, and the packet is transmitted to the gateway of the extracted address. In this case, when the control unit 124 assigns the IP of the wireless communication terminal 110 as a private IP, the controller 124 extracts an external IP address 308 corresponding to the SSID 303, and then extracts the IP of the wireless communication terminal 110. After changing the source address to the external IP address, the packet can be sent to the gateway.

Meanwhile, the controller 124 blocks internal communication between the wireless communication terminals 110 belonging to different virtual LAN IDs 301. That is, the controller 124 allows internal communication between the wireless communication terminals 110 belonging to the same virtual LAN ID 301 (that is, obtained the same SSID), but the wireless communication terminals of different virtual LAN IDs 301 are different. Internal communication is not allowed between the 110.

4 is a flowchart illustrating a method of accessing a heterogeneous network from a mobile router according to an embodiment of the present invention.

Referring to FIG. 4, the mobile router 120 broadcasts a plurality of SSIDs excluding the hidden mode by referring to the table of the storage 121 (S401). Then, the mobile router 120 may receive a connection request from the wireless communication terminal 110 obtained any one of the broadcast SSID (S403). In addition, the mobile router 120 may receive a connection request from the wireless communication terminal 110 including the SSID of the hidden mode or the non-hidden mode directly input by the user.

Then, the mobile router 120 extracts a gateway address corresponding to the SSID, and transmits a message requesting authentication of the wireless communication terminal 110 to the gateway address. Accordingly, the authentication request message is transmitted to the authentication server (not shown) in charge of the network to which the gateway belongs via the gateway, and the authentication server authenticates the validity of the wireless communication terminal 110, and as a result To transmit to the mobile router 120 (S405).

When the mobile router 120 receives the authentication success message, the mobile router 120 selects one unassigned IP address from the IP pool 302 of the storage unit 121 corresponding to the SSID 303 obtained by the wireless communication terminal 110. The extracted information is stored in a table (that is, terminal IP is allocated) and the IP allocated information is transmitted to the wireless communication terminal 110 (S407 and S409).

Next, the mobile router 120 may receive a packet from the IP assigned wireless communication terminal 110 (S411). The SSID obtained by the wireless communication terminal 110 is recorded in the header of the packet. Then, the mobile router 120 checks the SSID recorded in the header of the packet, extracts the gateway address 305 corresponding to the SSID 303 from the table of the storage unit 121, and sends it to the gateway of the address. The received packet is transmitted (S413, S415). At this time, the mobile router 120 extracts the external IP address 308 corresponding to the SSID 303 from the table of the storage unit 121, the IP address (ie, source address) of the wireless communication terminal 110 After changing to an external IP address, the packet can be transmitted to the gateway. The external IP address may be a public IP commonly used in the corresponding access network (130, 140, 150) or a private IP in the access network (130, 140, 150).

On the other hand, when receiving the authentication failure message from the authentication server in step S407, the mobile router 120 transmits a message indicating that access is not possible to the wireless communication terminal (110) (S417).

Meanwhile, when the stored external IP address is less than the private IP address, the mobile router 120 may add a port number to the external IP address when changing the private IP address to the external IP address. That is, when the mobile router 120 converts the private IP address of the wireless communication terminal 110 into an external IP address, the mobile router 120 adds a port number to the external IP address and stores the port number in a table corresponding to the private IP address. do. The port number is a kind of identification number (for example, telnet 23, ftp 21, etc.) indicating a specific service that is shared on the Internet, and the mobile router 120 adopts a port number that is not reserved as a service to an external IP address. Can be added. Accordingly, even if the mobile router 120 receives a packet in which the external IP address is set as the destination address, the mobile router 120 checks the port number recorded in the external IP and changes the external IP address to the private IP address corresponding to the port number. It may be transmitted to the wireless communication terminal 110.

For example, suppose that the table stored in the mobile router 120 is the same as that of FIG. 3, and the PDA 110a acquiring the SSID of KTF_hsdpa1 is assigned a private IP of 10.1.2.3 from the mobile router 120 to the Internet 160. Let's say we send a packet to a specific server requesting to view a web page. At this time, SSID information of KTF_hsdpa1 is recorded in the header of the packet. Then, the mobile router 120 changes the IP address (ie, source address) of the wireless communication terminal 110 from 10.1.2.3 to an external IP address of 132.168.41.97, and records the source port number 50000 in the header of the packet. Forward the packet to the gateway at address 132.168.41.91. Subsequently, the mobile router 120 may receive a web page packet having a destination IP address of 132.168.41.97 and a destination port number 50000 recorded in a header from a server requesting to view the web page. Then, the mobile router 120 confirms that the private IP corresponding to the external IP address 132.168.41.97 and the port number 50000 in the table is 10.1.2.3, and changes the destination IP address to 10.1.2.3 to the PDA 110a. Forward the web page packet. Accordingly, the PDA 110a receives the web page requested by the server and displays it on the screen.

According to the present invention described above, the network manager can establish a plurality of independent sub-networks through the mobile router of the present invention, and can set an access network gateway address, subnet mask, IP pool, etc. for each of the constructed sub-networks. On the other hand, a user having a PDA (110a), a notebook (110b) or a general purpose computer (110c) equipped with a wireless LAN module is any of heterogeneous networks, such as HSDPA network 130, CDMA network 140, WiBro network 150 One can connect selectively. In addition, the present invention provides a separate interface (that is, a heterogeneous network interface) for each constructed subnetwork, and at the same time, blocks the access between terminals belonging to different sub networks, thereby improving the complementaryness of the communication network.

Meanwhile, although the embodiments of the present invention have been described with reference to the HSDPA network, the CDMA network, and the WiBro network in the above-described embodiment, the present invention is not limited thereto, but the present invention is not limited thereto. It can be clearly applied to various networks such as IP Multimedia Subsystem (IMS).

The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in detail any more.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a view showing a state connected to a plurality of heterogeneous networks in a mobile router according to an embodiment of the present invention.

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

3 is a diagram illustrating a table referenced by a mobile router according to an embodiment of the present invention.

4 is a flowchart illustrating a method of accessing a heterogeneous network from a mobile router according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

120: mobile router 121: storage unit

122: internal communication module 123: external communication module

124: control unit

Claims (7)

A mobile router simultaneously accessing a heterogeneous access network based on a service set identifier for identifying a network, A storage unit for storing an IP pool and an access network gateway address corresponding to each service set identifier; A communication unit that broadcasts a plurality of service set identifiers and, accordingly, receives data from a terminal that has obtained any one service set identifier; And And a controller configured to extract an access network gateway address corresponding to the service set identifier obtained by the terminal from the heterogeneous gateway address of the storage unit, and transmit the data to the access network gateway. The method of claim 1, The control unit, When the connection request is received from the terminal, the mobile router, by referring to the IP pool of the storage unit corresponding to the service set identifier obtained by the terminal, allocates the IP address of the terminal. The method of claim 1, The control unit, And transmitting the data to the access network gateway, changing the IP address of the terminal to an IP address commonly used in the access network. A mobile router for simultaneous access to a heterogeneous access network, comprising: a method for accessing a heterogeneous network based on a table in which IP pools and heterogeneous access network gateway addresses are stored for corresponding service set identifiers for distinguishing networks. (a) receiving data from a terminal and confirming a service set identifier added to the data; (b) extracting an access network gateway address corresponding to the service set identifier from the heterogeneous access network gateway addresses in the table; And (c) transmitting the received data to the extracted access network gateway address. The method of claim 4, wherein Before step (a) above, Broadcasting a plurality of service set identifiers, and receiving a connection request from a terminal that has obtained any one of the service set identifiers; And And allocating an IP address of the terminal based on the IP pool corresponding to the service set identifier in the table. The method of claim 4, wherein Before step (a) above, Receiving a connection request from the terminal to which a service set identifier directly input by a user is added; And And allocating an IP address of the terminal based on the IP pool corresponding to the service set identifier in the table. The method according to claim 5 or 6, Step (c) is, Heterogeneous network access method in a mobile router, characterized in that for transmitting the data by changing the IP address of the terminal to the IP address commonly used in the access network.

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