KR20030088729A - Apparatus and Method for public WLAN service in subway area - Google Patents

Abstract

PURPOSE: A device for supplying a public wireless LAN service in a subway and a method therefor are provided to support a roaming service between an access point on the ground and radio points in subway stations through an access managing device, thereby giving a seamless service. CONSTITUTION: An AP(Access Point)(111) and RPs(Radio Points)(111:111a,111b) perform wireless sectional communication with a mobile terminal. An access managing device(120) manages the AP(111) and the RPs(111:111a,111b) in connection with the AP(111) and the RPs(111:111a,111b). A router(130) connects between the access managing device(120) and a network(10). An AAA(Accounting Authentication Authorization) unit(140), an NMS(Network Management System)(150), and an address assignment/location register(160) communicate with each other. A DNS(Domain Name Server)(170) communicates with the location register(160) over the Internet(20).

Description

Apparatus and method for public WLAN service in subway {Apparatus and Method for public WLAN service in subway area}

The present invention relates to an apparatus and method for providing a public wireless LAN service in a subway. More specifically, the wireless LAN service on the ground and a service in a subway section are provided seamlessly and wirelessly when moving on a subway. The present invention relates to a public wireless LAN service providing apparatus and method for providing a LAN service without interruption.

In general, a wireless LAN service using an access point (AP) cannot be serviced in a subway section due to characteristics of the access point. In other words, the subway does not transmit and receive data when moving. In addition, data transmission from the access point is not properly performed in the subway tunnel section where the radio wave environment is poor. In addition, the radio wave reaching distance from the access point is also insufficient to support the subway tunnel section.

The present invention was created to solve the above problems, the object of which is to provide a public wireless LAN (public wireless LAN) service in the subway section, in particular, even when children ride the subway to provide a seamless service It is to provide an apparatus and method for providing a public wireless LAN service in the subway.

1 is a block diagram of a public wireless LAN service providing apparatus according to an embodiment of the present invention,

2 is a flow chart for explaining the basic operation of the apparatus of FIG.

3 is a flowchart illustrating a process of supporting mobility based on mobile IP in a system configured as shown in FIG. 1 and basically operating as shown in FIG. 2 according to the present invention;

4 is a view for explaining the configuration and operation when the system of the present invention is applied to a real subway.

※ Explanation of code for main part of drawing

50: mobile terminal 111: access point

112, 112a, 112b, 112c: Radio points 120, 121, 122: Access management apparatus

130: router 140: billing / authentication server

150: network management system 160: address assignment / location registration device

170: domain name server

In order to achieve the above object, an apparatus for providing a public wireless LAN service in a subway according to the present invention includes: a first wireless connection means for wireless connection with a mobile terminal in a subway section; Second connecting means for wireless connection with the mobile terminal in a ground area; Connection management means connected to a plurality of said first access means and at least one said second access means for managing said connected access means, and for mobility management based on mobile IP; On the basis of the location registration request from the mobile terminal via the connection management means, the mobile station dynamically allocates an IP address as a reserved resource to the mobile terminal, and assigns the assigned IP address to the identification information of the connection management means. Address assignment / location registration means for registering, updating or registering in association with; And address management means for registering, updating, and deleting the assigned address in response to a request of the address assignment / location registration means to link the mobile terminal with the Internet network.

The second connecting means is composed of an access point, the first connecting means having the same function as the access point, but in the range of frequency band and service coverage in consideration of the degree of line of sight and / or the speed of the subway vehicle in the subway section. Is set to at least the corresponding performance of the second connecting means.

In addition, at least one first connecting means may be installed in the underground subway station and at least one of the first connecting means may be installed in the underground tunnel section between subway stations in accordance with the distance and the degree of bending of the corresponding section. Is characterized in that installed in the ground area of the history.

In order to achieve the above object, the public WLAN service providing method in the subway according to the present invention comprises the address assignment / location registration means for providing the public WLAN service in the subway seamlessly using the apparatus of claim 1. 10. A method in E, comprising: a first step of dynamically allocating a reserved IP address to the mobile terminal upon receiving a location registration request message from a subscriber mobile terminal through any first management means; Registering the assigned IP address in association with identification information for the mobile terminal and the first management means; And updating the cooperatively registered information such that upon receipt of a location registration request message from the mobile terminal through a new second management means, identification information of the first management means is replaced with identification information of the second management means. If the location registration request message is not received for more than a predetermined time period is configured to delete the registration.

Hereinafter, an apparatus and method for providing a public WLAN service in a subway according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an apparatus for providing a public wireless LAN service according to an embodiment of the present invention. As shown in FIG. 1, an access point for wireless section communication with a mobile terminal such as a laptop or a PDA is provided. Access Point (AP) 111 and Radio Point (RP) (111: 111a, 111b); A connection management device (120) as a node connected to the access point (111) and the radio point (111a, 111b) and managing them; A router 130 connecting the connection management device 120 and a network 10; A billing / authentication server (AAA) 140 connected to the network 10 to communicate with the connection management device 120 through the router 130, a network management system (NMS) 150 and the address assignment / location registration device 160; And a domain name server (DNS) 170 that communicates with the address assignment / location registration device 160 via the Internet 20.

The access point 111 represents a well-known end node utilized for existing WLAN service.

The radio point 112 replaces the access point 111 to provide a wireless LAN service in a subway environment, and a transmission data rate may be smaller than that of the access point 111 (that is, 11 Mbps). It is defined as having strong characteristics in the radio wave environment. In particular, even if a line of sight is not secured, communication with a mobile terminal is possible. In addition, the access point 111 is difficult to transmit and receive data when the speed is 30Km / h or more, but the radio point 112 does not have a problem in transmission and reception at the subway speed level. The use frequency band of the radio point 112 is a band of 2 to 5 GHz and the service coverage is several hundred m or more. In addition, the radio point 112 is to be installed in a subway station and a tunnel section, and between the station and the station. The number installed in the tunnel section may vary depending on the distance and the degree of bending.

At least one radio point 112 is installed in the underground subway station, and at least one radio point 112 is installed in the underground tunnel section between subway stations in which the subway is operated, depending on the distance and the degree of bending. 111 is preferably installed in the ground area of the history. As described above, the radio point 112 has different characteristics in the wireless section with the access point 111, but a function related to network connection is the access. Has the same / similar function as the point 111.

That is, the radio point 112 has the same / similar function as the access point 112, but the range of the frequency band and the service coverage, etc. in consideration of the degree of the line of sight in the subway section and / or the speed of the subway vehicle is at least the above. It is characterized by more than the corresponding performance of the access point (112).

The access management device 120 is a node for managing the access point 111 and / or the radio point 112, and assists a user's access or manages mobility and quality of service using a mobile IP. A node that performs QoS) management and VPN (VPN) functions.

The router 130 communicates the access management device 120 with the billing / authentication server 140, the network management system 150, or the address assignment / location registration device 160 according to the type of the transmission / reception message. Device.

The billing / authentication server 140 is the same as that used for the existing WLAN service, but may further consider a function for discriminating billing by distinguishing the use in the subway section.

The network management system 150 manages the access point 111, the radio point 112, the access management device 120, and the like as a server for managing the entire network. It is similar to the function used for existing WLAN service.

The address assignment / location registration device 160 dynamically allocates an IP address as a reserved resource to the mobile terminal based on a location registration request from the corresponding mobile terminal through the connection management device 120. And register, update, or delete the allocated IP address in association with identification information of the access management apparatus 120.

The domain name server 170 collectively manages an IP address on the Internet, and registers, updates, and deletes the assigned address in response to a request from the address assignment / location registration device 160. Function to interwork with Internet network.

In addition, the mobile terminal (laptop, PDA, etc.) used in the present embodiment is to be provided with a wireless LAN card capable of data communication in the wireless section with the access point 111 and the radio point 112.

2 is a flow chart for explaining the basic operation of the apparatus of FIG.

First, the mobile terminal 50 located in the wireless LAN is connected to the access point 111 on the ground and connected to the radio point 112 in the subway section (association) (S201), according to the authentication procedure of 801.1x. The authentication procedure through the authentication / charging server 140 is performed (S202).

Subsequently, the mobile IP stack provided in the mobile terminal 50 performs a procedure for receiving an IP address with the address assignment / location registration device 160 and 160 (MIP solicitation & advertisement) (S203).

After performing the protocol related to the mobile IP as in step S203, the mobile terminal 50 uses the network access identifier (NAI) value, ID (ID), password (Password), etc. When requesting registration of its own location to the address assignment / location registration device 160 through 120 (Registration Request) (S204 and S205), the address assignment / location registration device 160 may request the billing / authentication server ( In step 140, an access request message (Access Request) is sent to allow billing to be started (S206), and a response message (Access Response) thereto is received (S207). Subsequently, if user authentication and mobile IP registration from the billing / authentication server 140 and the address assignment / location registration device 160 are successful as a result of the process, the address assignment / location registration device 160 performs the step S204. And assigns an IP address to the mobile terminal 50 through the access management device 120 and the access point 111 or the radio point 112 in response to S205. Data communication is performed using the assigned IP address as a destination address (S208, S209).

3 is a flowchart illustrating a process of supporting mobility based on mobile IP in a system configured as shown in FIG. 1 and basically operating as shown in FIG. 2 according to the present invention.

First, in the same process as the steps S204 and S205 of FIG. 2, the subscriber mobile terminal 50 having a specific host name (hereinafter referred to as 'han') is registered with the address assignment / location through the first access management device 121. When requesting location registration from the device 160 (S301, S302), the address assignment / location registration device 160 is provided by itself based on the location registration request message transmitted from the first connection management device 121. One of the IP address resources (hereinafter referred to as ip1) is allocated to the corresponding terminal 50 (S303), and the allocated IP address resource ip1 is 'han' which is the host name of the terminal 50 and the currently connected. The location registration is performed in association with the recognition information of the first access management apparatus 121 (S304), and the registration of the IP address for the han: ip1 based on the location registration message is performed by the domain name server (DNS) ( 170) request to the side (S305), the DNS server 170 based on the request: register a 'han ip1' (S306).

In this way, the terminal 50 is connected to the first connection management apparatus 121, and the location registration and IP address resources are registered, and then the second connection management neighboring to the first connection management apparatus 121 moves. When the device 122 requests a location registration together with information of its host name 'han' and the assigned IP address 'ip1' through the device 122 (S307 and S308), The address assignment / location registration device 160 is based on the location registration request message transmitted from the second connection management device 122. The address assignment / location registration device 120 of the cooperatively registered 'han: ip1' 120 ) Is changed from the first address assignment / location registration device 121 to the second address assignment / location registration device 122, and the 'han: ip1' is converted into the second address assignment / location registration device ( The location is registered in association with the recognition information of step 122) (S309).

The address assignment / location registration device 160 allocates an IP address resource based on the location registration request message as described above, registers the allocated IP address, and requests a location registration for the registered 'han: ip1'. Check whether the message is received to calculate the unreceived duration (S310), and if the calculated unreceived duration exceeds the preset time (S311), the registered 'han: ip1' to the DNS server 170 Request to delete (S312), the DNS server 170 deletes the registered 'han: ip1' registration information based on the deletion request message (S313), and the address assignment / location registration that the deletion is completed. The device 170 is notified so that the allocated address resource ip1 can be dynamically allocated to another terminal (S314).

With reference to FIG. 1 to FIG. 3, an example of a service process by a method for providing a public WLAN service in a subway according to an embodiment of the present invention will be described with reference to FIG. 4. As follows.

First, it is assumed that a passenger (a user subscribed to a wireless LAN service) waiting for the subway in the subway premises has started using the service.

If the user travels from the subway station A to the subway station B while using the wireless LAN service continuously, the user can receive the service using the laptop or the PDA as in the existing wireless LAN service.

When a user connects to a wireless LAN using his terminal 50, a service is started through interworking with the access management device 120 and the authentication / billing server 140.

In the premises 410 of the subway station A, the radio point 111a installed in the premises 410 starts transmitting data to the user 50.

Then, when the subway car 430 passes between the station and the station, a new radio point 111b installed in the subway tunnel is in charge of the wireless LAN service. That is, roaming is performed from the radio point 111a of the station A to the radio point 111b in the subway tunnel through the connection management device 120.

Upon arrival at subway station B, the radio point 111c is roamed from the radio point 111b to the radio point 111c in the premises 420 of the station B by the same process as described above.

To this end, the connection management device 120 manages three radio points 111a, 111b and 111c respectively installed in the premises 410 of the subway station A, the premises 420 of the underground station B and the underground tunnel section between the stations. In addition to roaming between them, the connection management apparatus 120 supports a seamless WLAN service based on mobile IP between neighboring connection management apparatuses 121 and 122 as described with reference to FIG. 3. .

Even if a user who has received the service from the access point 111 on the ground uses the subway, the connection management device 130 roams between the ground access point 111 and the radio point 111a or 111c in the subway station. This support enables uninterrupted service delivery.

As described in detail above, according to the apparatus and method for providing a public wireless LAN service in a subway according to the present invention, by providing a wireless LAN service to users in a subway where a user's desire to use the Internet is very high, it may contribute to an increase in profits of an operator. In addition, it is possible to meet the needs of users, and also to ensure that the service provided on the ground and underground is seamless, and the service is made even when the subway moves.

Claims (7)

In public WLAN, First connection means for wireless connection with a mobile terminal in a subway section; Second connecting means for wireless connection with the mobile terminal in a ground area; Connection management means connected to a plurality of said first access means and at least one said second access means for managing said connected access means, and for mobility management based on mobile IP; On the basis of the location registration request from the mobile terminal via the connection management means, the mobile station dynamically allocates an IP address as a reserved resource to the mobile terminal, and assigns the assigned IP address to identification information of the management means. Address assignment / location registration means for registering, updating or registering and deleting in association; And And an address management means for registering, updating and deleting the assigned address at the request of the address assignment / location registration means to link the mobile terminal with the internet network. LAN service providing device. The method of claim 1, The second connecting means is composed of an access point, the first connecting means having the same function as the access point but in the range of frequency band and service coverage in consideration of the degree of line of sight and / or the speed of the subway vehicle in the subway section Apparatus for providing a public wireless LAN service in a subway, characterized in that is set to at least the corresponding performance of the second connection means. The method of claim 2, At least one first connecting means is installed in the underground subway station and at least one of the first connecting means is installed in the underground tunnel section between subway stations in which the subway is operated, depending on the distance and the degree of bending. Public wireless LAN service providing apparatus in the subway, characterized in that installed in the ground area of the history. The method of claim 1, The address management means is a public wireless LAN service providing apparatus in a subway, characterized in that configured as a Domain Name Server (Domain Name Server: DNS). A method in the address assignment / location registration means for seamlessly providing a public wireless LAN service in a subway using the apparatus of claim 1, A first step of dynamically allocating a reserved IP address to the mobile terminal upon receiving a location registration request message from the subscriber mobile terminal through any first management means; Registering the assigned IP address in association with identification information for the mobile terminal and the first management means; And A third step of updating the cooperatively registered information such that upon receipt of a location registration request message from the mobile terminal through a new second management means, identification information of the first management means is replaced with identification information of the second management means. Public wireless LAN service providing method in the subway, characterized in that configured to include. The method of claim 5, And deleting the registration when the location registration request message is not received for the predetermined time period and / or when the deletion request information is received from the mobile terminal. The method of claim 6, The deletion request information is a public wireless LAN service providing method in the subway, characterized in that the information about the power off of the mobile terminal.