CN201328128Y

CN201328128Y - Safe vehicle-borne gateway supporting vertical handoff function

Info

Publication number: CN201328128Y
Application number: CNU2008200717885U
Authority: CN
Inventors: 刘衍珩; 魏达; 余雪岗; 曲良东; 王健
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2008-04-30
Filing date: 2008-04-30
Publication date: 2009-10-14
Anticipated expiration: 2018-04-30

Abstract

The utility model provides a safe vehicle-borne gateway supporting vertical handoff function, which comprises a vehicle-borne CAN bus, a wireless network interface, a vertical handoff module (1), and a VPN module (2), wherein the vehicle-borne CAN bus interface is connected with vehicle-borne various CAN node electronic equipment networking; the wireless network interface is used for connecting various wireless internet equipment; the vertical handoff module (1) can automatically select switch-in manner according to each network interface connection state; and the gateway can conduct visit control and encryption and decryption to data receiving and sending through the VPN module (2).

Description

Support the vertical safe car borne gateway that switches

Technical field

The utility model relates to radio communication, computer network and automobile mounted equipment, relates in particular to a kind of vehicle-mounted gateway device of safety that utilizes vertical handoff technique that the Internet is connected with In-vehicle networking.

Technical background

Along with network technology, wireless communication technology and development of computer, the Web vehicle that collection radio communication, internet access and computer real-time are handled arises at the historic moment.Web vehicle is compared the function that has many advanced persons with orthodox car, for example internet access, global location navigation, remote fault diagnosis etc.And In-vehicle networking has different types of network at different application demands, as be most widely used, have and support the abundantest controller local area network CAN of components and parts; Vehicle-mounted media network MOST etc.In the Web vehicle intelligence system, an automobile should have the function that receives and relevant information is provided, and for example the receiving remote control command receives locating information, sends this car state information, request service etc.

Since 21 century, mobile communication presents varied, and application such as CDMA, GPRS, IEEE802.11, IEEE802.16 all provide feasible wireless access function, and wherein CDMA and being connected that GPRS provides, have the wide characteristics of area coverage, but access speed is slow, expense is higher; And IEEE802.11 and IEEE802.16 provide though to be connected scope less, access speed is fast, expense is cheap.Select suitable access way balance application and cost effectively.

The application of intelligent transportation system certainly will make that Web vehicle becomes one of terminal in the Internet.Following Web vehicle can provide any network information service relevant with internet, applications, and car owner and related management department all can inquire about or carry out Long-distance Control where necessary the information of automobile.And will realize that these functions need a car borne gateway equipment with In-vehicle networking and Internet connection, and can provide comparatively reasonable connection way and safe its communication ability.

Summary of the invention

The utility model provides a kind of safe vehicle gateway device of supporting vertical handoff functionality.This vehicle gateway device comprises: vehicle-mounted CAN bus, radio network interface, vertical handover module, VPN module.Wherein the vehicle-mounted CAN bus interface is connected with the networking of vehicle-mounted various CAN node electronic equipment; Radio network interface is used to connect various radio networking devices, and is connected into the Internet by radio networking device; Vertical handover module can be selected connected mode automatically according to the connection status of various network device, promptly switches voluntarily in various connected modes, and connected mode comprises supports CDMA and WLAN.The VPN module is carried out safeguard protection to the data that receive and send from gateway; all to encrypt from the data that car borne gateway flows out through the VPN module; and the data from remote access to the car borne gateway; select no matter adopt which kind of connected mode all will conduct interviews to control, then need deciphering for the data that allow to receive by the VPN module.。

Following Web vehicle can provide any network information service relevant with internet, applications, and car owner and related management department all can inquire about or carry out Long-distance Control where necessary the information of automobile.

This vehicle gateway device is In-vehicle networking and Internet connection, and the comparatively its communication ability of reasonable connection way and safety can be provided.

Description of drawings

Fig. 1 car borne gateway architecture

The vertical handover module workflow of Fig. 2

Fig. 3 VPN module workflow

Embodiment

Hardware is formed

● processor, adopt ARM framework series CPU;

● memory, adopt 64MB RAM, 16MB flash;

● the Wireless Telecom Equipment interface, adopt serial ports, USB mouth, PCMCIA mouth or CF mouth;

● the In-vehicle networking interface, adopt the CAN bus interface;

● Wireless Telecom Equipment, adopt the CDMA/GPRS dial number card, WLAN/WMAN wireless network card software is formed:

● built-in Linux operating system;

● the Wireless Telecom Equipment driver;

● the In-vehicle networking driver;

● vertical handover module (1);

● the VPN module; (2)

After possessing above-mentioned hardware condition, need in embedded Linxu operating system, load corresponding various device driver, comprise Wireless Telecom Equipment driver and In-vehicle networking driver, the various device driver can be provided by production firm.After each equipment normal load and work, need to load vertical handover module (1) and VPN module (2), these two modules realize by the C language.The workflow of vertical handover module (1) is seen Fig. 2, tackles virtual network interface from the data that car borne gateway sends, and selects concrete Wireless Telecom Equipment to send data according to the connection status of various connected modes then.And from the data that Wireless Communication Equipment is received, the location that only selects your destination is the data of this machine, is forwarded to VPN module (2) by virtual network interface then, submits to upper layer application by VPN module (2).VPN module workflow is seen figure (3), and the left side sends to the process of corresponding vehicle-mounted bus from virtual network interface by the VPN module for data among the figure, and the right side is data send to virtual network interface by the VPN module from vehicle-mounted bus a process.Cryptographic algorithm is that symmetric data is encrypted.For the connection request that receives, according to the application control that conducts interviews.

The whole workflow of this car borne gateway is as follows:

1. system power-up guides (SuSE) Linux OS to start, and operating system loads Wireless Telecom Equipment and In-vehicle networking device driver, loads vertical handover module (1) and VPN module (2) then;

2.VPN module (2) selects suitable access way to connect remote server by the virtual network device module automatically;

3. when sending data, In-vehicle networking is submitted to the on-vehicle information data and sends in the buffer queue, by VPN module (2) reading of data from send buffer queue, send to vertical handover module (1) then, select suitable Wireless Telecom Equipment that data are sent by virtual network interface wherein, the data that send all are through encrypting.

4. when receiving data, after Wireless Telecom Equipment arrives Data Receiving, virtual network interface by vertical handover module (1) judges whether and can receive, the data that can not receive directly abandon, receivable data then are decrypted, and by VPN module (2) data are sent to corresponding In-vehicle networking receiving cache queue then.

Claims

1 one kinds of safe vehicle gateway devices of supporting vertical handoff functionality, this vehicle gateway device comprises: vehicle-mounted CAN bus, radio network interface, vertical handover module, VPN module, and it is characterized in that: the vehicle-mounted CAN bus interface is connected with the networking of vehicle-mounted various CAN node electronic equipment; Radio network interface connects radio networking device, and connects the Internet by radio networking device; CDMA or WLAN radio network interface are selected in the output of vertical handover module; The VPN module connects by the selected radio network interface of vertical handover module, and connects the vehicle-mounted CAN interface.

The 2 safe vehicle gateway devices according to the vertical handoff functionality of the described support of claim 1 is characterized in that: be equipped with two heterogeneous radio network interfaces, CDMA and WLAN.