KR20060022961A - A subway wireless lan system - Google Patents

Abstract

A Gigabit Gate Router (GGR) serving as a router for interworking with a public network and supporting a hand-off function of mobile subscribers between base stations; A base station router (BSR) for supporting hand-off of a subway wireless LAN subscriber by interworking with the gate router for interworking with a public network; A fixed access switch (FAS) fixed to a subway underground line at fixed intervals; A mobile access router (MAR) installed in a control room of a subway electric vehicle and configured to perform an RF link with the fixed radio repeater (FAS); A plurality of access points (APs) connected to the mobile radio repeater (MAR) in a train by wire to perform wireless interworking with a terminal device; A subway WLAN system comprising a FAS Concentration Switch (FCS) that performs a tangential function of converging a plurality of remote fixed radio repeaters (FAS) to be connected to the base station router (BSR).

Subway, WiFi

Description

Subway wireless LAN system

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

2 is an exemplary view showing a wireless LAN configuration in a subway carriage.

The present invention relates to a wireless LAN system, and more particularly, to a wireless LAN system for providing a wireless LAN service to a subscriber in a train moving in a special environment such as a railway or subway.

Wireless LAN (LAN) is the result of wireless communication technology that provides the advantages of Local Area Network (LAN), which allows a variety of information and resources to be shared, and the convenience of providing unlimited connectivity. Its advantages are flexibility and ease of installation. In addition, since wireless LAN uses electromagnetic waves from an access point (AP) to a terminal, it is possible to construct a network within a relatively quick time compared to a wired LAN. In addition, there is an advantage that wireless communication is possible on the move by using a terminal such as a notebook and a wireless LAN card without staying in a fixed computer environment.

The wireless LAN service using the access point (AP) is currently only available on the ground due to the nature of the access point (AP) service is not available in the subway section. That is, wireless data cannot be transmitted / received between the access point and the WLAN card installed in the user terminal while the subway car is moving. In addition, the access point (AP) is insufficient to support the radio wave reach of the wireless LAN card in the tunnel section of the subway station with poor radio environment, so data transmission and reception between the WLAN card and the access point (AP) is not performed properly. I can't.

In the existing WLAN configuration, a router interworking with a public network and a wireless AP directly connected to the router (or via an L2 switch) are installed in an area to support a service. When the subscriber enters the area, a wireless link is established between the terminal and the wireless AP to provide the WLAN service. Herein, the WLAN service in an electric vehicle includes all IP services such as the Internet, video chat, and games provided by the existing WLAN network. In addition, in the case of a mobile WLAN service for supporting mobility, the use of mobile IP technology is essential.

However, when the subway wireless LAN network is configured with the existing wireless LAN network structure, the electric vehicle forms a barrier of radio waves. Therefore, there is a problem that the electric wave from the wireless AP does not receive from the electric vehicle, or the radio wave of the wireless LAN terminal is not properly transmitted to the AP. In addition, the train is a conductor (conductor) has a problem that can not support a stable wireless environment by acting as a large incomplete shield (Shield Box).

An object of the present invention is to provide a subway wireless LAN service system that can provide a wireless LAN service in a train moving in a special environment, such as railway and subway.

Another object of the present invention is to provide a stable mobile wireless LAN environment for subscribers.

Subway wireless LAN service system according to the present invention for achieving this purpose is to configure the independent wireless LAN network in the electric vehicle and wireless environment between the Mobile Access Router (MAP) and Fixed Access Switch (FAS) It is characterized by the configuration of the configuration.

Features of a concrete configuration of a subway wireless LAN service system according to the present invention serves as a router for interworking with the public network and supports a hand-off function of mobile subscribers between base stations (Gigabit Gate Router: GGR) Wow; A base station router (BSR) for supporting hand-off of a subway wireless LAN subscriber by interworking with the gate router for interworking with a public network; A plurality of fixed access switches (FAS) fixedly installed at regular intervals in the subway station and performing a data buffering function for handoff processing according to the movement of the wireless LAN terminal; The mobile radio is installed in the control room of the subway train and performs radio link with the fixed radio repeater (FAS) and performs handoff processing by an algorithm defined according to the radio strength of the fixed radio repeater (FAS). A repeater (MAR); A plurality of access points (APs) connected to the mobile radio repeater (MAR) by wire in the passenger carriage to perform wireless interworking with a terminal device; It includes a FAS Concentration Switch (FCS) that performs a condensation function for converging a plurality of far-away fixed radio repeaters (FAS) to connect with the base station router (BSR).

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the subway wireless LAN service system according to the present invention.

1 is a schematic view showing a subway wireless LAN service system according to the present invention. As shown, the base station router (BSR) 31, 32 for the interworking of the gate router (GGR) 20 for interworking with the public network, and the lower router switch (FCS) 41, 42 for the gate router 20. And wired linking and mobile radio repeater (MAR) with aggregation switches 41 and 42 having aggregation functions of a plurality of fixed radio repeaters (FAS) 51, 52, 53, and 54 (base station router (BSR)). And a fixed radio repeater (FAS) 51, 52, 53, 54 for wireless interworking with 71, 72, and 73.

The Gigabit Gate Router (GGR) 20 serves as a router for interworking with the integrated management system 10 through a public network. It supports the function of a general router and a mobile subscriber station (Hand Off) function between a base station router (BSR).

The base station routers (BSRs) 31 and 32 work in conjunction with the gate router (GGR) 20 to support handoff of subway wireless LAN subscribers. In addition, a plurality of fixed access switches (FAS) 51, 52, 53, and 54 are managed through the FAS Concentration Switch (FCS) 41, 42.

The FAS Concentration Switch (FCS) 41 and 42 is an L2 switch having a condensation function for converging distant fixed radio repeaters (FAS) and connecting them to the base station routers (BSR) 31 and 32.

Fixed access switch (FAS) (51, 52, 53, 54) is installed on the subway underground line at regular intervals. Preferably fixedly installed at intervals of 500m to 1km. The aggregation switches 41 and 42 perform wired interworking with base station routers 31 and 32 and wireless interworking with a mobile access router (MAR) 60 installed in the subway. The wireless interworking standard uses a standard such as 802.11b.

As shown in FIG. 2, subway wireless LAN subscribers (Notebook, PDA1, PDA2) are connected to vehicle access points (VAPs) 71 and 72 fixedly installed in subway cars. The VAPs 71 and 72 installed for each passenger car are connected to the mobile radio repeater (MAR) 60 installed in the train control room by wire. The mobile radio repeater (MAR) 60 is wirelessly interlocked with the fixed radio repeaters 51, 52, and 53 installed on the subway track. The WLAN subscriber data may be connected to the public network through VAP 71 → MAR 60 → FAS 51 → FCS 41 → BSR 31 → GGR 20 to receive services. During the subway movement, the handoff function of the base station routers (BSR) 31 and 32 and the gate router (GGR) 20 may be supported to receive a seamless service.

As described above, the subway wireless LAN service system according to the present invention has an effect that can be provided without a mobile wireless LAN service in a special environment, such as subway (or railway).

Claims (2)

A Gigabit Gate Router (GGR) serving as a router for interworking with the public network and supporting a hand-off function of a mobile subscriber between base stations; A base station router (BSR) for supporting hand-off of a subway wireless LAN subscriber by interworking with the gate router for interworking with a public network; A plurality of fixed access switches (FAS) fixedly installed at regular intervals in the subway station and performing a data buffering function for handoff processing according to the movement of the wireless LAN terminal; The mobile radio is installed in the control room of the subway train and performs radio link with the fixed radio repeater (FAS) and performs handoff processing by an algorithm defined according to the radio strength of the fixed radio repeater (FAS). A repeater (MAR); A plurality of access points (APs) connected to the mobile radio repeater (MAR) by wire in the passenger carriage to perform wireless interworking with a terminal device; A subway wireless LAN system comprising a FAS concentration switch (FCS) that performs a condensation function of converging a plurality of remote fixed radio repeaters (FAS) in the distance and the base station router (BSR). The subway wireless LAN system according to claim 1, wherein the fixed wireless repeater (FAS) is fixedly installed at an interval of 500 m to 1 km.

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