KR20120108464A - Push server system for resolving a nat traversal and conrolling method therefor - Google Patents

Abstract

PURPOSE: A push server system for preventing a NAT(Network Address Translation) traversal and a control method thereof are provided to easily receive a PUSH message by maintaining NAT binding of a mobile communication terminal and a PUSH server. CONSTITUTION: Terminal equipment(1A-1N) periodically transmits a message for location registration information to higher level equipment through a session process. A PUSH server(2) always obtains a transmission path through the location registration information of the terminal equipment. The PUSH server transmits a PUSH message to corresponding terminal equipment using the obtained equipment transmission path. The PUSH server comprises a registrar module(3) transmitting a connection request message through the obtained transmission path in the state that the location registration message is received and a PUSH service module(4) transmitting the PUSH message. NAT equipment(5) changes a source IP address of the terminal equipment into a public IP address. A firewall(6) blocks service data using a different port. [Reference numerals] (7) Mobile radio communication network

Description

      PUSH server system for resolving a NAT TRAVERSAL and conrolling method therefor}

The present invention relates to a PUSH server system that solves NAT TRAVERSAL, and a control method thereof. In particular, after the Registra module is provided in the PUSH server, the mobile communication terminal periodically maintains NAT Binding through a register message and manages its path. The present invention relates to a PUSH server system and a method of controlling the NAT TRAVERSAL that improve the operational stability of the PUSH server system.

In general, network technology is being further expanded by including wireless and mobile communication technology, through which information is downloaded and widely used through mobile wireless units such as desktop systems, mobile phones, PDAs, and notebook computers. In particular, the prominent service feature of such information communication is the "push" (hereinafter referred to as "PUSH") feature, also known as the "notification" or "warning" feature. This PUSH feature allows a client to request service or information from a server in a typical client / server model.

In addition, the server widely uses a "pull" technique in the form of sending and responding information to the client, the client pulls the information from the server. For example, when a Uniform Resource Locator (URL) is entered at a client device, it is a full transaction that the client sends to the server to extract the relevant information. On the other hand, the PUSH technology generally refers to a method of transmitting information to one or more devices without user execution in advance. Therefore, there is no explicit request from the client before the server sends the server's information, so the PUSH technique essentially involves a server-initiated transaction. In recent years, the PUSH technology may be used in connection with various protocols and mobile communication technologies. In such a case, a client, such as a mobile terminal, communicating over a mobile network, typically has a communication session with the server (e.g. SIP) via a Network Address Translator (NAT) located between the client and the server, such as a "PULL" technology. Communication session), where the NAT can replace the client's private IP address with a public IP address that the server can recognize.

      Then, referring to FIG. 1 of the conventional PUSH communication system including a NAT as described above, a client device that registers by providing its own information to a higher level device through a session process in order to process various content information and obtain necessary information ( 70A-N);

      A PUSH server 71 for registering and managing individual information provided from the client device 70A-N and transmitting the content information to the client device 70A-N if there is content information to be pushed;

      It is installed between the client device 70A-N and the PUSH server 71 to refer to the local IP address and the global IP address of the client device 70A-N and the local address of the client device 70A-N included in this message. A NAT device 72 for converting the IP address into a global IP address or vice versa;

     Installed between the client device 70A-N and the PUSH server 71, the service data using only the port corresponding to the port number is passed by referring to the port number assigned to the data push service, and the service data using another port. It is configured to include a firewall 73 to block the.

      On the other hand, the operation of the PUSH communication system including the conventional NAT as described above, first, each of the client equipment (70A-N) undergoes a session process to register with the PUSH server 71, the client device (70A) Since the NAT device 72 and the firewall 73 exist between -N) and the PUSH server 71, the client device 70A-N and the PUSH server 71 must pass through these devices to communicate with each other.

      That is, when the client devices 70A-N register with the PUSH server 71, the NAT device 72 converts the local IP address of the registering client device 70A-N into a global IP address. Send to firewall 73. The firewall 73 transmits the data transmitted from the NAT device 72 to the PUSH server 71 when the port number is assigned to the data push service. Then, the PUSH server 71 is the individual information of the client devices 70A-N received from the client devices 70A-N through the NAT device 72 and the firewall 73 during the session process. For example, information about client devices 70A-N such as a local IP address, a global IP address, and a port number assigned to a data push service is received and registered.

      When the PUSH service data occurs after the registration process as described above, the PUSH server 71 uses the individual information of the client devices 70A-N registered in advance to the corresponding client devices 70A-N. In this case, the PUSH information is first transmitted to the NAT device 72 through the firewall 73 by the pre-registered port number of the client device 70A-N. Then, the NAT device 72 converts the global IP address of the PUSH server 71 into a local IP address included in the individual information of the corresponding client device 70A-N provided from the PUSH server 71, and the corresponding client device. The PUSH content information is transmitted to 70A-N to execute the normal PUSH service.

However, in the PUSH communication system including the conventional NAT as described above, each time the PUSH server wants to push data, the individual information of the client device must be provided to the NAT device and the firewall. In this case, the data PUSH object of the PUSH server as described above must be managed not only with one client device but also with a plurality of client devices, so maintaining information of all of them is a significant load on the PUSH server. There was a problem that it works.

      Moreover, the PUSH communication system including the conventional NAT as described above is provided with a function that the NAT device generally performs address translation for a session initiated by a client, and performs address translation for a session initiated by a PUSH server. In this process, there is a problem that the PUSH service is stopped in this process, which significantly lowers the stability of the PUSH service.

Accordingly, the present invention has been invented to solve the above problems, and since the PUSH server and the mobile communication terminal always maintain NAT Binding, even if the terminal is located in the NAT solves NAT TRAVERSAL can be easily transmitted PUSH message Its purpose is to provide a PUSH server system and its control method.

Another object of the present invention is to reduce the maintenance and maintenance costs of the network, because even if the mobile communication terminal is under a NAT environment, the PUSH server can immediately send a message through the secured path without requiring additional equipment. The present invention provides a PUSH server system that solves TRAVERSAL and its control method.

In the present invention for achieving the above object in the PUSH system that the network is connected through NAT equipment,

      A terminal device that periodically transmits a message for location registration information to a higher device through a session process in order to process various content information and obtain necessary information to the PUSH system;

      Always secure the transmission path through the location registration information of the terminal equipment periodically transmitted from the terminal equipment (1A-N), if there is a PUSH message to push the PUSH message to the corresponding terminal equipment using the transmission path of the secured equipment Provides a PUSH server system that solves NAT TRAVERSAL, including a PUSH server for transmitting.

      Another feature of the present invention includes a terminal equipment location registration information process in which a registrar module of a PUSH server receives location registration information signals from terminal devices and registers location information of corresponding terminal devices;

A NATbinding process in which, after the terminal device location registration information process, the terminal device periodically transmits the location registration information to the registrar module of the PUSH server through the secured transmission path to maintain the NAT Binding state;

A PUSH message checking step of checking whether a PUSH message to be transmitted is periodically polled by a PUSH server's registrar module after the NATbinding process;

A connection connection request process for securing a transmission path by transmitting a connection connection request signal to terminal devices by a registrar module of the PUSH server when a PUSH message to be transmitted to the PUSH service module is found during the PUSH message checking process;

After the connection connection request process, the PUSH service module of the PUSH server includes a PUSH message transmission process of transmitting a PUSH message using the connection connection information of the corresponding terminal device obtained through the connection connection request message of the registrar module as a destination address. Provides control method of PUSH server system that solves NAT TRAVERSAL.

The present invention as described above is provided with a Registra module in the PUSH server, and the PUSH server and the mobile communication terminal by transmitting a PUSH message through the path while managing to maintain the NAT Binding always through the Register message periodically with the mobile communication terminal Since the NAT Binding is always maintained, PUSH messages can be easily transmitted even if the terminal is located in the NAT, thereby improving the operational stability of the PUSH server system.

In addition, according to the present invention, even if the mobile communication terminal is in a NAT environment, it is possible to immediately transmit a message through the secured path when a PUSH server is needed without adding a separate device, thereby significantly reducing the maintenance operation cost of the network. There is also.

1 is an explanatory diagram illustrating an example of a PUSH communication system including a conventional NAT.
2 is an explanatory diagram illustrating a PUSH server system that solves NAT TRAVERSAL according to the present invention;
3 is a flowchart of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

PUSH system according to the present invention is a terminal equipment (1A-N) to periodically transmit a message for the location registration information to the higher-level equipment through the session process in order to process various content information and obtain necessary information as shown in FIG. Wow;

      Always secure the transmission path through the location registration information of the terminal equipment periodically transmitted from the terminal equipment (1A-N), if there is a PUSH message to push the corresponding terminal equipment (1A-) by using the transmission path of the secured equipment N) is configured to include a PUSH server (2) for sending a PUSH message.

      In this case, the PUSH server 2 receives the location registration message periodically from the terminal equipment 1A-N and manages to maintain the NAT Binding at all times, and if there is a PUSH message, the PUSH server 2 connects through the secured path when receiving the location registration message. A registrar module (3) for sending a request message,

    When the PUSH message is generated, it is notified at the time of periodic polling of the registrar module 3 and the PUSH message using the source IP and PORT of the corresponding terminal equipment 1A-N according to the connection request message of the registrar module 3 as a destination address. It further comprises a PUSH service module (4) for transmitting the.

      And, between the terminal equipment (1A-N) and the PUSH server (2) with reference to the source IP address and the public IP address of the terminal equipment (1A-N) source of the terminal equipment (1A-N) included in this message A NAT device 5 for converting an IP address into a public IP address or vice versa;

     It further includes a firewall 6 for passing only service data using a port corresponding to the port number by referring to a port number assigned to the data PUSH service by the PUSH server 2 and blocking service data using another port. Can be configured.

      Here, the PUSH server 2 may be connected to the NAT device (5) via a communication network (7) or may be directly connected.

Next, the control method of the present invention having the above configuration will be described.

In the method of the present invention, as shown in FIG. 3, in the initial state S1, a registrar module of a PUSH server receives location registration information signals from terminal devices and registers location information of corresponding terminal devices. (S2);

A NATbinding process (S3) in which, after the terminal equipment location registration information process (S2), the terminal equipment periodically transmits the location registration information to the registrar module of the PUSH server through the secured transmission path to maintain a NAT binding state;

After the NATbinding process (S3), the PUSH message checking step (S4) for the registrar module of the PUSH server periodically polls the PUSH service module of the PUSH server and whether there is a PUSH message to be transmitted;

If there is no PUSH message to be transmitted to the PUSH service module as a result of the PUSH message checking process (S4), the registrar module of the PUSH server returns to the transmission path obtaining process (S3) and repeats the loop.

If there is a PUSH message to be transmitted to the PUSH service module as a result of the PUSH message checking process (S4), the connection connection request process of the registrar module of the PUSH server transmitting the connection connection request signal to the terminal devices to secure the transmission path ( S5);

After the connection connection request process (S5), the PUSH service module of the PUSH server transmits the PUSH message using the connection connection information of the corresponding terminal device secured through the connection connection request message of the registrar module as a destination address ( S6) is configured to include.

The connection connection information of the PUSH message transmission process S6 includes source IP and PORT information of the corresponding device.

In other words, each terminal equipment 1A-N connected to the PUSH server 2 of the present invention first undergoes a session process to register with the PUSH server 2.

At this time, the terminal equipment (1A-N) is installed between the terminal equipment (1A-N) and the PUSH server (2) NAT device (5) and the firewall (6) to register their location information The equipment (5, 6) must first go through.

Therefore, the terminal equipment 1A-N first transmits to the NAT device 5 including the source IP for identifying itself in the location registration information and the port number assigned to the data PUSH service. Then, the NAT device 5 converts the source IP address of the terminal equipment 1A-N for location registration into a public IP address assigned to the PUSH server 2 and transmits it to the firewall 6. The firewall 6 transmits the data transmitted from the NAT device 5 to the PUSH server 2 when the port number is assigned to the data push service.

Accordingly, the registrar module 3 of the PUSH server 2 transmits the corresponding terminal devices received from the respective terminal devices 70A-N through the NAT device 5 and the firewall 6 during the session process. Individual information of 1A-N), for example, receives and registers information about terminal devices 1A-N such as a source IP address, a public IP address, and a port number allocated to a data PUSH service.

Meanwhile, after the terminal equipments 1A-N register the location through the above process, the terminal equipments 1A-N periodically register the registrar module 3 of the PUSH server 2 through the secured transmission path. Keeps the NAT Binding state as it continues to send location properties.

In other words, between the registrar module 3 of the PUSH server 2 and the terminal equipments 1A-N, a transmission path capable of transmitting and receiving data is always secured.

In addition, during the process, the registrar module 3 of the PUSH server 2 periodically checks whether there is a PUSH message to be transmitted by polling the PUSH service module 4.

During the polling process, the registrar module 3 of the PUSH server 2 repeatedly performs the polling process when there is no PUSH message to be transmitted to the PUSH service module 4.

However, the registrar module 3 of the PUSH server 2 transmits the connection connection request signal to the terminal equipments 1A-N when there is a PUSH message to be transmitted to the PUSH service module 4, and then sends a response. After receiving the transmission path, the connection connection information, that is, source IP and PORT information of the corresponding equipment is transmitted to the PUSH service module 4 of the PUSH server 2.

Then, the PUSH service module 4 of the PUSH server 2 is the connection connection information of the corresponding terminal equipment 1A-N secured through the connection connection request message of the registrar module 3, that is, the source IP of the equipment and The PUSH message is pushed to the destination address using the PORT information. At this time, the PUSH message including the connection connection information is first passed through the firewall 6 by the pre-registered port number of the terminal equipment 1A-N. Transmitted to the NAT device (5). Then, the NAT device 5 converts the public IP address of the PUSH server 2 into the source IP address included in the individual information of the corresponding terminal device 1A-N provided from the PUSH server 2 to the corresponding terminal device. Since the PUSH message information is transmitted to (1A-N), even if the terminal equipment is located in the NAT environment, the PUSH service can be easily executed.

1A-N: Terminal Equipment 2: PUSH Server
3: registrar module 4: PUSH service module
5: NAT equipment 6: firewall
7: communication network

Claims (5)

In the PUSH system in which a network is connected through a NAT device,
A terminal device that periodically transmits a message for location registration information to a higher device through a session process to process various content information and obtain necessary information to the PUSH system;
Always secure the transmission path through the location registration information of the terminal equipment periodically transmitted from the terminal equipment (1A-N), if there is a PUSH message to push the PUSH message to the corresponding terminal equipment using the transmission path of the secured equipment PUSH server system that solves NAT TRAVERSAL, including a PUSH server for transmitting. The method of claim 1, wherein the PUSH server periodically receives a location registration message from the terminal equipment and manages to maintain NAT binding at all times, and if there is a PUSH message, the PUSH server transmits a connection request message through the secured path when receiving the location registration message. A registrar module,
When the PUSH message is generated, it is configured to include a PUSH service module for notifying the registrar module of periodic polling and transmitting the PUSH message with the connection address of the corresponding terminal equipment according to the connection request message of the registrar module as a destination address. PUSH server system that solves NAT TRAVERSAL, characterized in that.       The PUSH server system of claim 2, wherein the connection connection information includes source IP and PORT information of a terminal device. A terminal equipment location registration information process of receiving a registration information signal from terminal devices by a registrar module of the PUSH server and registering location information of corresponding terminal devices;
A NATbinding process in which, after the terminal device location registration information process, the terminal device periodically transmits the location registration information to the registrar module of the PUSH server through the secured transmission path to maintain the NAT Binding state;
A PUSH message checking step of checking whether a PUSH message to be transmitted is periodically polled by a PUSH server's registrar module after the NATbinding process;
A connection connection request process for securing a transmission path by transmitting a connection connection request signal to terminal devices by a registrar module of the PUSH server when a PUSH message to be transmitted to the PUSH service module is found during the PUSH message checking process;
After the connection connection request process, the PUSH service module of the PUSH server includes a PUSH message transmission process of transmitting a PUSH message using the connection connection information of the corresponding terminal device obtained through the connection connection request message of the registrar module as a destination address. Control method of PUSH server system that solved NAT TRAVERSAL. 5. The PUSH server system of claim 4, wherein the PUSH message transmission process further comprises a connection connection information configuring step of configuring connection connection information including source IP and PORT information of a terminal device. Control method.

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