KR20090087661A - Gateway loaded with hsdpa device driver based on linux and its operating method - Google Patents

Abstract

A gateway in which a Linux-based mobile communication device driver is mounted and a driving method thereof are provided to connect a sensor network to the Internet efficiently through the previously constructed mobile communication network infra. A mobile communication module(30) performs the connection to a mobile communication network. The first USB(Universal Serial Bus) interfacing unit(21) performs the internal data communication between a processor(20) and the mobile communication module. The second USB interfacing unit(31) performs the internal data communication between the mobile communication module and processor. By loading a mobile communication device driver for the mobile communication module on a Linux kernel stage, the processor controls the mobile communication module through the first and second USB interfacing units.

Description

Gateway loaded with hsdpa device driver based on linux and its operating method}

The present invention relates to a gateway for performing a function of relaying data between different networks (for example, to transfer information collected from a sensor network to the Internet) and a driving method thereof, and more particularly to mobile communication based on Linux. The present invention relates to a gateway equipped with a Linux-based mobile communication device driver and a driving method thereof for mounting a device driver in a gateway to access a mobile communication network through interworking of a mobile communication module and a USB interface.

Recently, thanks to the development of Ubiquitous Sensor Network (USN) technology, wireless sensors installed in a specific location can collect information about the location and provide it to an information server on the Internet.

Meanwhile, in order to relay information collected from a plurality of wireless sensors on the sensor network to the Internet, a gateway connecting the sensor network to the Internet should be provided.

For example, the sensor network uses a wireless communication protocol such as RFID communication, Zigbee communication, etc., whereas the Internet uses TCP / IP protocol and UDP protocol. Cannot send data directly to information servers on the Internet. Thus, a gateway for relaying data between different networks as described above is provided.

However, in the prior art as described above, referring to the gateway connecting the sensor network and the Internet, in consideration of the communication coverage range of the plurality of wireless sensors, the gateway is capable of communicating with the sensor network side, preferably close to the plurality of wireless sensors. In particular, the sensor network is typically formed in an area that is difficult to build by wire, and there is a problem in that the gateway is connected to a router, which is an Internet access device, using a long wired cable.

That is, considering the current sensor network technology, due to the limitation of the communication distance between the wireless sensors and the gateway, the gateway has to be installed near the wireless sensors, but the latest wireless data communication technology, which is difficult to establish by wire, Although it is possible to connect the gateway to the Internet through an infrastructure such as a mobile communication network that can cover the same sensor network area, it can be seen that it is very inefficient to configure the gateway as a wired network access equipment as in the prior art.

In addition, considering that the demand for gateways will increase exponentially as each sensor network construction area increases in the future, it is possible to configure gateways at low specification (low specification) and low cost so that they can be connected to the mobile communication network smoothly. There is also an urgent need for technology.

Accordingly, the present invention has been proposed in order to solve the above problems and meet the above requirements, and to mount a mobile communication device driver in a gateway based on Linux to a mobile communication network through interworking with a mobile communication module and a USB interface. The purpose of the present invention is to provide a gateway equipped with a Linux-based mobile communication device driver and a method of driving the same.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above 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.

The present invention for achieving the above object, the gateway comprising: a mobile communication module for connecting to a mobile communication network; First USB interfacing means for performing internal data communication between the mobile communication module and a processor; Second USB interfacing means for performing internal data communication between the processor and the mobile communication module; And a processor for controlling the mobile communication module through the first USB interfacing means and the second USB interfacing means by uploading a mobile communication device driver relating to the mobile communication module to a Linux kernel terminal.

On the other hand, the present invention provides a gateway, comprising: a mobile communication module for connecting to a mobile communication network; Communication means for performing internal data communication of the mobile communication module; And Linux kernel means for registering the mobile communication module as a device of a gateway through the communication means using a mobile communication device driver relating to the mobile communication module to use the mobile communication network connection.

On the other hand, the method of the present invention, the gateway driving method, comprising the steps of recognizing (detecting) the mobile communication module to the USB host function by loading the mobile communication device driver as the Linux operating system of the gateway; Registering the recognized mobile communication module with a Linux kernel to activate the mobile communication module inside a gateway; Executing a PPP daemon that manages a PPP connection mode through a network driver of the gateway; And transmitting the PPP access command by the executed PPP daemon to the mobile communication module using the loaded mobile communication device driver.

The present invention as described above has an effect that can be efficiently connected to the Internet through a mobile communication network infrastructure that is difficult to establish a wired sensor network.

In addition, the present invention can easily configure the device (H / W) and software (S / W) of the gateway by connecting to the mobile communication network through the interworking of the mobile communication module and the USB interface using a Linux-based mobile communication device driver It works.

In addition, the present invention has the effect of making it easy to build a sensor network by configuring the gateway at low specifications (low specification), low cost.

The above objects, features, and advantages will become more apparent from the detailed description given hereinafter with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains may share the technical idea of the present invention. It will be easy to implement. 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 network diagram illustrating a gateway equipped with a Linux-based mobile communication device driver according to the present invention.

As shown in FIG. 1, a gateway (hereinafter referred to as "gateway") 10 equipped with a Linux-based mobile communication device driver according to the present invention is constructed from a plurality of wireless sensors (not shown) on a sensor network. The received information is relayed to a destination such as an information server 90, a mobile terminal 91, a computer 92, and the like on the Internet through a mobile communication network. Of course, the gateway 10 also relays data for controlling a specific wireless sensor from the information server 90 or the like onto the sensor network.

Hereinafter, the sensor network and the Internet shown in FIG. 1 will be described in describing the present invention. However, the gateway 10 may be applied to any network that relays data between different networks through a mobile communication network connection. It will be easy to understand at the level.

In addition, in the present invention, the mobile communication network means a 3G data network using a wireless Internet access standard such as HSDPA, etc. The "mobile communication module" provided in the gateway to be described below is preferably "HSDPA module", The "mobile communication device driver" may be a representative example of the "HSDPA device driver", respectively.

2 is a diagram illustrating an embodiment of a gateway equipped with a Linux-based mobile communication device driver according to the present invention.

As shown in Fig. 2, the gateway 10 according to the present invention includes a processor 20, a USB interface unit (e.g., a USB port) 21 on the processor side, a mobile communication module 30, and the mobile communication. And a USB interface unit (eg, a USB port) 31 on the module side, a sensor network communication module 40, and the like. Here, the gateway may be configured by replacing the sensor network communication module 40 with the corresponding network communication module according to the type of network in which the gateway according to the present invention is installed (used, constructed).

The gateway according to the present invention is based on a Linux operating system (Linux OS), and in the internal data communication between the processor 20 and the mobile communication module 30, a USB communication scheme, for example, through the USB interface unit 21 on the processor side. Data transmission / reception is performed using a USB host function and a USB client function (USB Client) through the USB interface unit 31 on the mobile communication module side.

Meanwhile, in order to perform USB communication between the processor 20 and the mobile communication module 30, a mobile communication device driver for the mobile communication module 30 is required, and the mobile communication device driver is installed on a Linux kernel (Lunux). Kernel).

Particularly, in the present invention, the PPP daemon (Point-to-Point Protocol Daemon) ["pppd"] is executed in a state in which the mobile communication device driver is uploaded to the Linux kernel. The communication module 30 is used to connect to the mobile communication network. As such, the present invention provides a mobile communication device driver for Linux, which will be described in detail with reference to FIG. 3.

3 is an internal layer diagram of a gateway equipped with a Linux-based mobile communication device driver according to the present invention.

As shown in FIG. 3, the gateway according to the present invention includes a mobile communication module 30, a USB interface unit 31 on the mobile communication module side, and a USB interface unit 21 on the processor side in a hardware layer. The Linux kernel 60 is installed in the operating system layer, the network application 71 is installed in the application layer, and the PPP daemon [Pppd] is implemented in the Linux kernel 60. The network protocol stack 61, the mobile communication device driver 62, and the network API system call 63 on which the network driver is installed are installed.

In the gateway of the present invention, the internal communication with the mobile communication module 30 is performed using the mobile communication device driver 62 on the Linux kernel 60, and the network protocol stack 61 and the internal communication are performed using the PPP daemon provided in the network driver. Perform communication.

The mobile device driver 62 consists of a specification defined in the USB standard protocol, preferably according to the "Embedded Linux Kernel 2.6.15" version and is compatible with any processor having a USB host function.

The Linux kernel 60 uses the mobile communication device driver 62 to recognize, register and use the mobile communication module 30 as a gateway device through the USB interface unit 31 on the mobile communication module side.

That is, in the present invention, the Linux kernel 60 allows the processor 20 to access and control the mobile communication module 30 using the USB interface, and the Linux kernel 60 uses the USB interface. 30 to be connected to the mobile communication network using a PPP network access method.

Meanwhile, the PPP network access method used in the present invention will be briefly described.

In the present invention, in the mobile communication device driver, the mobile communication network is connected through the interface interworking between the Linux kernel 60 and the mobile communication module 30 using PPP. The data link layer protocol [HDLC; High-Level Data Link Control Protocol] is designed to meet mobile device driver's frame structure (e.g. maximum 1,500 bytes). As described above, according to the present invention, a mobile communication device driver is created based on PPP, and thus data error detection, data recovery, and fast data transfer can be implemented through buffer management and data transfer according to the PPP frame structure on the gateway. It is.

Table 1 below shows the frame structure of PPP.

In [Table 1], the header of the PPP frame is composed of three fields of 8 bits each, the data is variable, the trailer is composed of 16 bits, and the “F” of the header is a start / stop frame. Frame, "A" represents Address, "C" represents Control, and "FCS" of the trailer represents a Frame Check Sequence.

The protocol of the PPP is composed of an LCP layer (Link Control Protocol Layer) and an NCP layer (Network Control Protocol Layer), and in the LCP layer, data link establishment is performed that does not depend on a protocol of a higher layer, and in the NCP layer, Data processing depending on the protocol of the upper layer is performed.

Then, the method for driving the gateway according to the present invention described above will be described in detail with reference to FIG. 4 as follows. The processor 20 performs the procedure.

FIG. 4 is an exemplary diagram illustrating an internal driving procedure of a gateway equipped with a Linux-based mobile communication device driver according to the present invention.

As the gateway according to the present invention is driven, the Linux kernel 60 loads the mobile communication device driver 62 and is connected to the USB interface unit 31 through the USB interface unit 31 on the mobile communication module side. That is, the mobile communication module 30 is recognized (detected). That is, as shown in FIG. 4, as the Linux kernel 60 is loaded inside the gateway and the system is booted, the Linux kernel 60 is located at "/ etc / ppp / option" using "modprobe option". The configuration file corresponding to the mobile communication device driver is read, and the mobile communication device driver 62 is loaded to recognize (detect) the mobile communication module 30 through the USB interface unit 31. At this time, the gateway detects the mobile communication module 30, which is a corresponding serial interface device, by connecting the mobile communication module by extending the USB interface through the mobile device driver as the mobile device driver is loaded into the Linux kernel. It is.

Thereafter, the Linux kernel 60 registers the mobile communication module 30 by registering the network interface name "ttyUSB0" regarding the detected mobile communication module 30 in the "/ dev" position using the "modprobe option". Activate it. Meanwhile, the Linux kernel 60 may perform a process of initializing a structure allocation and a mobile communication module operation for controlling the mobile communication module as hardware prior to registering the mobile communication module.

Then, as the mobile communication module having the network interface name "ttyUSB0" is registered in the Linux kernel 60 as described above, the Linux kernel 60 relates to the PPP connection mode located in "/ etc / ppp / option". The configuration file is read and the PPP daemon ["pppd"] is executed through the network driver on the network protocol stack 61.

Thereafter, the Linux kernel 60 reads the "AT Command" configuration file located in "etc / ppp / chatscripts" and transmits the PPP connection command by the PPP daemon through the mobile communication device driver 62 to the mobile communication module 30. The mobile communication module 30 accesses the mobile communication network by performing an operation according to the corresponding PPP access command. PPP connection commands used here include "connect / usr / sbin / chat -v -f / etc / ppp / chatscripts" for mobile network connection and "ipcp-accept-remote" for remote IP configuration. For example, "ipcp-accept-local" for setting local IP is used. On the other hand, in "/ etc / ppp / chatscripts", a PPP connection command, preferably a PPP connection script, is set. For example, the script "ABORT BUSY" refers to a string exiting the PPP connection execution routine when a call is in progress. do.

As described above, the gateway performs an operation according to a PPP access command (eg, performs an authentication procedure with a mobile communication system [not shown] [ID / password authentication of USIM card] and IP address assignment procedure) and accesses a mobile communication network. Application [relay information received from the wireless sensor on the sensor network to the information server on the Internet through a mobile communication network, etc.].

As described above, in the present invention, the mobile communication module has a structure such as a serial modem, and is connected to the mobile communication network through a PPP connection through a modem. To this end, the mobile communication device driver proposed in the present invention provides a communication interface between the PPP daemon and the mobile communication module [performs a function of initializing a mobile communication module, setting a mobile communication module, and making a call through an AT command]. For example, when a "call command for mobile communication" is generated by the PPP daemon, the command is passed from the Linux kernel to the mobile communication module on the hardware layer.

In addition, in the present invention, the network application 71 calls the network API system call 63 to connect to the mobile communication network using the mobile communication module 30 performing an operation according to the PPP connection instruction by the PPP daemon. It can be. For example, as the network application 71 is executed at the gateway, the network application 71 calls a network API system call 63 to construct a packet through the network protocol stack 61, which packet is a PPP daemon. Is transmitted to the mobile communication module 30 connected to the USB interface unit 31 through the mobile communication device driver 62 and transmitted to the mobile communication network. As such, it can be seen that the mobile communication device driver 62 performs a bridge function for transmitting / receiving internal data between the Linux kernel 60 and the hardware 50.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

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.

1 is a network diagram illustrating a gateway equipped with a Linux-based mobile communication device driver according to the present invention;

2 is a diagram illustrating an embodiment of a gateway on which a Linux-based mobile communication device driver is mounted according to the present invention;

3 is an internal layer diagram of a gateway equipped with a Linux-based mobile communication device driver according to the present invention;

FIG. 4 is an exemplary diagram illustrating an internal driving procedure of a gateway equipped with a Linux-based mobile communication device driver according to the present invention.

* Explanation of symbols on the main parts of the drawing

20: processor

21: USB interface of the process side

30: mobile communication module

31: USB interface unit on the mobile communication module side

60: Linux kernel

61: network protocol stack (network driver)

62: mobile communication device driver

63: Network API System Calls

71: network applications

Claims (11)

For the gateway, A mobile communication module for connecting to a mobile communication network; First USB interfacing means for performing internal data communication between the mobile communication module and a processor; Second USB interfacing means for performing internal data communication between the processor and the mobile communication module; And The processor for controlling the mobile communication module through the first USB interfacing means and the second USB interfacing means by uploading a mobile communication device driver relating to the mobile communication module to a Linux kernel terminal; Gateway based Linux-based mobile device driver is included. The method of claim 1, The processor is connected to a sensor network, and the mobile communication module is connected to the internet through the mobile communication network. For the gateway, A mobile communication module for connecting to a mobile communication network; Communication means for performing internal data communication of the mobile communication module; And Linux kernel means for registering the mobile communication module as a device of a gateway through the communication means using a mobile communication device driver for the mobile communication module for use in a mobile communication network connection Linux-based mobile device driver that includes a gateway. The method of claim 3, wherein The Linux kernel means, And running the PPP daemon while registering the mobile communication module to use the mobile communication module through an interface interworking between the PPP daemon and the mobile device driver. The method of claim 4, wherein The Linux kernel means, The internal communication with the mobile communication module using the mobile communication device driver, and the internal communication with the network protocol stack using the PPP daemon on the network driver. . The method of claim 4, wherein The PPP daemon, And a script-based PPP connection command generated under the control of the Linux kernel means to allow the mobile communication module to access the mobile communication network in a PPP connection mode. The method of claim 3, wherein The Linux kernel means, As the Linux operating system of the gateway is driven, the Linux-based mobile communication device driver is loaded with the mobile communication device driver and recognizes (detects) the mobile communication module with a USB host function through the communication means. Gateway. The method of claim 7, wherein The Linux kernel means, And a network interface name related to the recognized mobile communication module to the [Linux kernel means] to activate the mobile communication module. The method of claim 3, wherein The mobile device driver is a gateway equipped with a Linux-based mobile device driver, characterized in that consisting of the USB standard protocol and the specifications defined in "Embedded Linux Kernel". The method according to any one of claims 3 to 9, And the mobile communication device driver is designed (created) according to a frame structure of a data link layer protocol (HDLC) defined in PPP. In the gateway driving method, Recognizing (detecting) the mobile communication module with a USB host function by loading the mobile communication device driver as the Linux operating system of the gateway is driven; Registering the recognized mobile communication module with a Linux kernel to activate the mobile communication module inside a gateway; Executing a PPP daemon that manages a PPP connection mode through a network driver of the gateway; And Transferring the PPP access command by the executed PPP daemon to the mobile communication module using the loaded mobile communication device driver; Linux-based mobile communication device driver including a method of driving a gateway.

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