CN1291557C - Communication device, communication system and programme - Google Patents

Abstract

To provide a communication device that can effectively utilize network resources, especially wireless communication resources (wireless channels) in data communication, and even if the connection is disconnected on the terminal side, no reconnection procedure is required from the application or user side. In this device: store the connection information and the IP address assigned by the server at the moment when the initial dial-up IP connection was made; cut off the connection when the timed data communication is interrupted; when restarting the communication step according to the IP address, start again Carry out dial-up connection and accept the distribution of new IP address; After reconnecting, as the address of terminal, set described IP address in the data packet for terminal, set new IP address in the data packet for server.

Description

Communication device, communication system and method thereof

technical field

The invention relates to a communication device, in particular to a data communication modem card.

Background technique

In conventional data communication via wireless communication lines such as personal handy phone systems or public telephone lines, the connection between the terminal side, the communication line network, and the server side is always maintained even when the transmission data is not being received.

In addition, in dial-up IP connection (PPP (Point to point protocol: Point-to-point protocol) connection), the server side assigns an IP address to the connected terminal, and then communicates based on this IP address. And, this IP address is released when disconnecting, and a new IP address is assigned when reconnecting. Therefore, the application program (Web browser, etc.) on the terminal side performs communication processing from the IP address that was first connected. If the call is once disconnected, the IP address has changed next time, so the procedure for reconnection must be performed on the application side again.

As mentioned above, in a wireless communication line such as a personal handheld telephone system, if the terminal side, the base station, and the server side are constantly connected, the use efficiency of the wireless channel will be reduced, and the use of network resources including public telephone lines will be reduced. on waste.

In addition, if the IP connection via dial-up is disconnected, the procedure for reconnection must be carried out again on the application side, so that the user needs to bear additional costs.

Contents of the invention

In view of the above-mentioned problems, the present invention provides a communication device that can effectively use network resources, especially wireless communication resources (wireless channels) in data communication. On the terminal side, even if the connection is cut off, from From the perspective of the application side or the user side, no reconnection procedure is required.

The communication device of the present invention is connected to a server via a communication line in a dial-up IP mode in response to a connection request from a terminal, and is characterized in that it is provided with: storing connection information for performing a dial-up IP connection to the server and implementing a dial-up IP connection A storage device for an IP address provided from a server at a time; a connection management device for cutting off a connection when data communication is interrupted for a predetermined time; Carry out dial-up IP connection again to described server, accept the distribution of the new IP address that provides from described server, and store the reconnecting device of this new IP address in described memory device; After connecting again, as described terminal address, The IP address is set in the data packet for the terminal, and the address conversion device for setting the new IP address in the data packet for the server, the communication line is a wireless communication line, and the communication means It is a data communication card.

In addition, the communication device of the present invention, in response to a connection request from a terminal, dials an IP connection to a server via a communication line, and is characterized in having: storing connection information for performing a dial-up IP connection to the server; storage means of the IP address provided by the server; the connection is cut off due to the main reason on the communication line, and then the communication is restarted based on the IP address from the terminal, and the dial-up IP connection can be made to the server again according to the connection information, Receive the distribution of the new IP address that provides from described server, and store the reconnection device of this new IP address in described storage device; The IP address is set, and the address conversion device for setting the new IP address in the data packet to the server, the communication line is a wireless communication line, and the communication device is a data communication card.

In addition, the present invention may be a communication system composed of the communication device and a computer as the terminal.

In addition, the structure of the communication system may further include: a communication line including a wireless communication line and the Internet, and the server connected through the communication line.

In addition, the method of the present invention is a method for controlling the data communication card in the data communication card that dials the IP connection to the server through the wireless communication line in response to the connection request from the terminal, and is characterized in that it includes: storing the dial-up IP address to the server. The step of connection information for connection; the step of storing the IP address provided by the server when implementing the dial-up IP connection; the step of cutting off the connection when the data communication for a predetermined time is interrupted; after the connection is cut off, according to the IP address from the terminal When the address restarts communication, the step of dialing the IP connection again to the server according to the connection information; accepting the new IP address allocation provided by the server, and storing the new IP address; after reconnecting, as the terminal address, setting the IP address in the data packet for the terminal, and setting the new IP address in the data packet for the server.

In addition, the method of the present invention is a method for controlling the data communication card in the data communication card that responds to the connection request from the terminal and wirelessly dials the IP connection to the server through the communication line, and is characterized in that it includes: storing the The step of the connection information of the server; the step of storing the IP address provided by the server when performing the dial-up IP connection; when the connection is cut off due to the main reason on the communication line, and when the communication is newly started according to the IP address from the terminal, Carry out the step of dialing IP again to connect to the server according to the connection information; accept the new IP address allocation provided by the server, and store the new IP address; after reconnection, as the address of the terminal, in the The step of setting the IP address in the data packet for the terminal, and setting the new IP address in the data packet for the server.

Description of drawings

Fig. 1 is a schematic block diagram representing the structure of a data communication card of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the overall configuration of PC to server (RAS) including the data communication card of the embodiment.

Fig. 3 is a schematic diagram of communication steps between the data communication card of the described embodiment, PC and RAS;

Explanation of symbols: 1 is a data communication card (communication device); 1a is a wireless communication device; 1b is a PC interface device; 1c is a CPU (connection management device, reconnection device, address conversion device); 1d is a memory (storage device) .

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a data communication card as an embodiment of the present invention. Fig. 2 includes the data communication card of the same embodiment, and schematically shows the overall configuration from the PC to the server (RAS).

In Fig. 1, symbol 1 is the data communication card of this embodiment. In addition, reference numeral 1a is a wireless communication device. This wireless communication device 1a performs transmission signal modulation and reception signal demodulation while performing transmission and reception of wireless signals based on wireless communication standards stipulated in personal portable telephone systems and the like. Also, symbol 1b is a PC interface device, and this PC interface device 1b is an interface for electrically connecting the data communication card and a personal computer (hereinafter referred to as PC). In this embodiment, a structure based on the PC Card (PC Card) standard or the Compact Flash memory card (Compact Flash) standard is adopted.

In addition, the symbol 1c is a CPU (Central Processing Unit), which controls the operation of each part of the data communication card 1, and performs data communication control while performing the procedure of dialing IP to the server (RAS: Remote Access Server). For example, if it is a personal handy phone system, it can complete the access to the Internet according to the regulations of PIAFS (Personal handy system Internet Access Forum Standard). In addition, hereinafter, for the sake of simplicity, the above-mentioned RAS configuration is an access point for a dial-up IP connection (PPP connection), and various services are provided to the PC side.

In addition, symbol 1d is a memory, which is composed of RAM (Random-Access Memory) and ROM (Read-Only Memory). RAM is used for storing: as the working area of above-mentioned CPU 1c, the IP address (the original IP address and the new IP address described later) that distributes when dial-up IP connection; As the connection information for carrying out dial-up IP connection; From PC side The telephone number and authentication information (account number, password, etc.) of the dial-up IP connection target party (access point) imported; On the other hand, the ROM stores control programs loaded and executed by the CPU 1c and various data necessary for communication processing.

As described above, in the data communication card 1 of the present embodiment, the CPU 1c controls the communication procedure based on the above-mentioned standard with respect to the wireless communication device 1a and the PC interface device 1b.

The data communication card 1 of this structure is shown in Figure 2, is electrically connected with PC 2, and transmits to the RAS 3 located in ISP (Internet Service Provider) through the wireless communication line network of wireless communication (Figure 2: symbol 10～12) connect.

The data communication card 1 of the present embodiment has the above-mentioned structure, but it is a conventional data communication card connected to a PC, and has the common structure and function of a data communication card for data communication through a personal hand-held telephone system. That is to say, from the data communication card connected to the PC, through the wireless communication line network of the personal handy phone system, the dial-up IP connection to the RAS is implemented, from the start of the data communication to the disconnection of the connection in the normal processing mode, their The function is the same. The differences and features of the data communication card 1 of this embodiment from conventional data communication cards are discussed below.

The data communication card 1 responds to the connection request from the application on the PC side, and performs the first dial-up IP connection as usual. After this initial dial-up IP connection, the above-mentioned connection information input from the PC side by the IP address assigned by the RAS side (hereinafter referred to as the original IP address) is stored in the memory 1d. At this time, when the original IP address and connection information are stored after completing the first dial-up IP connection that was normally handled in the past, the acquired original IP address and connection information are rewritten and stored.

As above, complete the initial dial-up IP connection. After connection, carry out normal data communication, the time that is set separately (this time is set in the RAM specified on the network side, but it can also be stored in ROM in advance, or set in RAM from the PC side), data communication When interrupting, CPU 1c cuts off the dial-up IP connection of current connection to RAS request, ends present dial-up IP connection (hereinafter referred to as the state that is in connection logically on the application side, and intentionally cuts off 3 physical connections as dormant (Dormant) state ). There is also a case where such disconnection of the dial-up IP connection is caused by some factors on the communication line. In this case, in this embodiment, the PC side is not notified that the connection is disconnected. Thus, the PC-side application continues to operate in a logically connected state.

Thereafter, when the application on the PC side accesses the RAS again, that is, when the communication procedure is restarted according to the original IP address, the CPU 1c starts the process of dialing up the IP connection to the RAS again. At this time, the RAS is accessed based on the connection information stored in the RAM, and the assignment of a new IP address (hereinafter, this IP address is referred to as a new IP address) is received. Then, the assigned new IP address is stored in the memory 1d. At this time, when the new IP address that has been previously stored when the reconnection is completed in the past exists, it is rewritten as the new IP address obtained this time and saved (and, as connection information, when further storing information for connecting with other RAS, so that It is possible to switch the RAS of the connection destination).

Then, for access to the RAS using the original IP address from the PC, the CPU 1c converts its own address (transmission source IP address) contained in the transmitted data packet (transmission data packet) from the original IP address to a new IP address, and Send this data packet. On the other hand, the destination IP address of the packet data (received data packet) received from the RAS is converted from the new IP address to the original IP address and provided to the PC. Through such processing, the application program on the PC side can perform data communication in the same connection state (setting state) as when the dial-up IP connection was started, and the user can operate without realizing that the connection disconnection has occurred.

The above processing is carried out from the application on the PC side to the reception of the request to disconnect the dial-up IP connection.

Next, the operation of the data communication card 1 of this embodiment configured in this way, and the operations of the PC and the RAS connected via the data communication card 1 will be described together. Fig. 3 shows the communication steps between the data communication card 1, PC and RAS.

Initially, accepting a call connection request from the PC to the RAS, the data communication card 1 starts a call connection to the RAS according to the telephone number included in the connection information, and returns a response notifying this point to the PC after the call connection is established.

Thereafter, the PC starts a communication procedure of a dial-up IP connection (PPP connection) to the RAS. Correspondingly, the data communication card 1 performs a process of PPP connection to the RAS, and establishes a data link between the PC and the RAS. At this time, an IP address (original IP address) is assigned to the PC from the RAS side. In the above process, the data communication card 1 stores the connection information and the original IP address input from the PC side.

Thereafter, between the PC and the RAS, the above-mentioned original IP address is used as the address of the PC for data communication, but if the data communication is interrupted at a predetermined time, the data communication card 1 executes the process of cutting off the currently connected call, and starts to stop state. From this point on, the application on the PC side still maintains the original communication state logically, but it has been cut off physically, and the original IP address and its session period are released on the RAS side.

Thereafter, if the data communication from the PC side is started again, the data communication card 1 performs the reconnection of the RAS call according to the telephone number contained in the connection information, and after the call connection is established, the PPP connection process to the RAS is performed again , to establish a data link between the data communication card 1 and the RAS. At this time, a new IP address (new IP address) is assigned from the RAS, and the data communication card 1 stores this new IP address.

Thereafter, the data communication card 1 corresponds to the access from the PC to the RAS, transforms the address of the PC side as the sending destination IP address from the original IP address to a new IP address, and sends data packets. For the data packets received from the RAS, Convert the PC side address which is the IP address of the transmission destination from the new IP address to the original IP address, and provide it to the PC.

Then, the process of starting the call disconnection in the above-mentioned pause state and restarting the data communication after the pause state is terminated is repeated until a connection disconnection request is received from the PC side.

In addition, the processing procedure demonstrated above is an example, and is not limited to the flow of said processing.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to the embodiments, and configurations and the like that do not depart from the scope of the present invention are also included. For example, the function of the processing device in FIG. 1 may be added to a computer system such as a personal computer, and the computer system may perform dial-up IP connection/reconnection processing. In addition, the "computer system" referred to here includes hardware such as an OS and peripheral devices. In addition, when using the WWW system, it is assumed that the "computer system" also includes a home page providing environment (or display environment).

In addition, it is also possible to record a program for realizing the functions of the processing device in FIG. 1 on a computer-readable recording medium, and make the above-mentioned computer system read and execute the program recorded on the recording medium. Perform dial-up IP connection/reconnect processing.

Here, the "computer-readable recording medium" refers to removable media such as flexible discs, magneto-optical discs, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems. "Computer-readable recording medium" also includes the volatile memory (RAM) included in the server and client when the program is transmitted through a network such as the Internet and a communication line such as a telephone line. A memory device that can hold a program for a certain period of time.

In addition, the above-mentioned program is transmitted from a computer system storing the program in a storage device or the like to another computer system through a transmission medium or a transmission wave in the transmission medium. Here, the "transmission medium" of the transmission program refers to a medium having a function of transmitting information through a network (communication network) such as the Internet or a communication line (communication network) such as a telephone line.

In addition, the above-mentioned program may realize only a part of the above-mentioned functions. In addition, it is not a program that can realize the above-mentioned functions by combining with a program already stored in the computer system, that is, a so-called differential file (difference program).

As described in detail above, according to the present invention, when a data communication interruption occurs as a predetermined time, the connection is cut off, and when the communication step is restarted based on the IP address from the terminal, after reconnection, as the address of the terminal, The IP address is set in the data packet for the terminal, and the IP address conversion of the new IP address is set in the data packet for the server. Therefore, even if the physical connection of the terminal that output the original connection request is blocked It is also possible to continue the logical dial-up IP connection even after disconnection, and use the IP address provided for the first dial-up IP connection to access the original connection destination. That is, even if the connection is disconnected on the terminal side, no reconnection procedure is required from the application or the user side. Moreover, since the connection is cut off when the data communication is interrupted for a predetermined time, network resources in data communication, especially wireless communication resources (wireless channels) can be effectively used.

Furthermore, according to the present invention, even if the connection is disconnected due to reasons on the communication line, the communication device can reconnect and perform the above-mentioned address conversion, so that the terminal can continue to connect to the original connection destination. This is especially effective when the communication line is a wireless communication line that is likely to be disconnected due to factors on the communication line.

Furthermore, by adding the above-mentioned functions to the data communication card, it is not necessary to change or develop the network equipment, thereby reducing the cost of development.

Claims (6)

1. a communicator responds the connection request of self terminal to be connected to server via communication line by dialup ip, it is characterized in that being provided with:

Storage is in order to the link information of carrying out connecting to described server dialup ip and the moment that is connected at the enforcement dialup ip storage device from the IP address that server provides;

Cut off the connection management device that connects during the predetermined time data communication disruption;

After connecting cut-out, when beginning communication steps again according to described IP address from described terminal, carrying out dialup ip according to described link information once more to described server connects, acceptance is from the distribution of the new IP address that described server provides, and in described storage device the jockey again of this new IP address of storage;

After connecting again,, in giving described terminal data grouping, set described IP address, in giving described server data grouping, set the address conversion device of described new IP address as described terminal address;

Described communication line is a wireless communication line; Described communicator is a data communication card.

2. a communicator responds the connection request of self terminal to be connected to server via communication line by the dialup ip connected mode, it is characterized in that being provided with:

Storage in order to the link information of carrying out connecting to described server dialup ip with implementing the storage device that dialup ip is connected the IP address that the moment provides by server;

Because connecting, the main cause on the communication line is cut off, and when beginning communication steps again according to described IP address from described terminal, carrying out dialup ip according to described link information once more to server connects, reception is from the distribution of the new IP address that described server provides, and in described storage device the jockey again of this new IP address of storage;

After connecting again,, in giving the packet of described terminal, set described IP address, in giving described data in server grouping, set the address conversion device of described new IP address as described terminal address;

Described communication line is a wireless communication line; Described communicator is a data communication card.

3. communication system is characterized in that:

The computer of terminal constitutes by the communicator described in right request 1 or 2 and as described in becoming.

4. the communication system of being put down in writing as right request 3 is characterized in that further being provided with:

The communication line that comprises wireless communication line and internet, and pass through the described server that this communication line connects.

5. method of coming the connection request of self terminal via wireless communication line this data communication card of control in the data communication card that server connects with dialup ip in response is characterized in that comprising:

Storage is carried out the step that dialup ip connects the link information of usefulness to described server;

Be stored in the step of having implemented the IP address that moment that dialup ip connects provides by server;

When interrupting, the data communication of the scheduled time cuts off step of connecting;

After connecting cut-out, when communicating step again, carry out dialup ip step of connecting once more to described server according to described link information according to described IP address from described terminal;

The new IP address assignment that acceptance is provided by described service, and store the step of this new IP address;

After connecting again,, in giving the packet of described terminal, set described IP address, in giving described data in server grouping, set the step of described new IP address as described terminal address.

6. one kind is come the self terminal connection request to control the method for this data communication card via wireless communication line in the data communication card that server connects in the dialup ip mode in response, it is characterized in that comprising:

Storage is used for the step that dialup ip is connected to the link information of described server;

Be stored in the step of having carried out the IP address that moment that dialup ip connects provides by server;

Be cut off because of the main cause on the communication line connects, and when communicating step again, carry out once more the step that dialup ip is connected to described server according to described link information according to described IP address from described terminal;

Acceptance is from the distribution of the new IP address that described server provides, and stores the step of this new IP address;

After connecting again, as the address of described terminal, in the packet of described terminal, setting described IP address, in the step of in described data in server grouping, setting described new IP address.

Images