KR100685740B1 - Terminal of performing hand-over using link information of data link layer - Google Patents

Abstract

A terminal apparatus for performing a hand-over using link information of a data link layer is provided to support an mSCTP(mobile Stream Control Transmission Protocol) hand-over between different networks by dynamically allocating an IP(Internet Protocol) address based on data link layer information. A terminal apparatus for performing a hand-over using link information of a data link layer includes a link layer information collection unit(20), a database unit(30), a hand-over performance determining unit(40), a hand-over performance unit(60), a session management unit(70), and a dynamic address setting management unit(50). The link layer information collection unit(20) collects link information in real time which includes information associated with an activity of network interface modules. The link information management database unit(30) stores the link information collected by the link layer information collection unit(20). The hand-over performance determining unit(40) determines to perform a hand-over based on link information of the link information management database unit(30). The hand-over performance unit(60) performs the hand-over according to a determination of the hand-over performance determination unit(40). The session management unit(70) operates the link layer information collection unit(40), initializes a session or terminates a predetermined session to terminate a communication based on an allotted IP address for a network interface module which is detected by the link layer information collection unit(20). The dynamic address setting management unit(50) sets the IP address to the hand-over performance unit(60) so that the dynamic address setting management unit(50) checks whether the IP address of the collected link information is used in a current session, adds, deletes or changes the IP address to the current session according to a request of the hand-over performance determining unit(40).

Description

Terminal device performing handover by using link information of data link layer {TERMINAL OF PERFORMING HAND-OVER USING LINK INFORMATION OF DATA LINK LAYER}

1 is a block diagram showing the overall network system to which the terminal device according to an embodiment of the present invention is applied.

2 is a block diagram schematically illustrating an internal configuration of a terminal device according to an exemplary embodiment of the present invention.

3 is a flowchart sequentially illustrating an operation of a link layer information collecting unit of a terminal device according to an exemplary embodiment of the present invention.

4 is a flowchart sequentially illustrating operations of a handover execution determiner of a terminal device according to an exemplary embodiment of the present invention.

5 is a flowchart sequentially illustrating operations of a dynamic address setting management unit of a terminal device according to an exemplary embodiment of the present invention.

6 is a flowchart sequentially illustrating operations of a handover performing unit of a terminal device according to an exemplary embodiment of the present invention.

7 is a flowchart sequentially illustrating a process of processing a message received by a counterpart terminal communicating with a terminal apparatus according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

120: terminal device

20: link layer information collecting unit

30: Link Information Management Database

40: handover performance determination unit

50: dynamic address setting management unit

60: handover performer

70: session management unit

The present invention relates to a terminal device having a handover function based on a mobile stream control transmission protocol (mSCTP), and more particularly, an mSCTP hand between different heterogeneous networks using link information of a data link layer. A terminal device having a dynamic address setting function for supporting over.

Conventionally, in order to ensure IP mobility for a mobile terminal, IP address information used by the mobile terminal for communication with the counterpart terminal is registered in a location management server installed on a network, and the counterpart terminal is registered with the location management server. Set up a connection with a mobile terminal using IP address information. However, this conventional method requires additional investment in network equipment such as a location management server in order to provide mobility of the terminal. In addition, in order to support handover for a mobile terminal, there is a problem in that efficient handover is not guaranteed because tunneling between routers and structural changes to a network are required.

An object of the present invention for solving the above problems is to provide a terminal device having a dynamic address setting function to support handover using only link information of the data link layer, without the installation of a network equipment such as a separate location management server will be.

A feature of the present invention for achieving the above technical problem relates to a terminal device equipped with at least one network interface module to support handover between different heterogeneous networks,

A link layer information collector configured to collect link information including information related to activation or deactivation of network interface modules in real time;

A link information management database unit for storing link information collected by the link layer information collecting unit;

A handover performance determination unit determining whether to perform a handover by using link information of the link information management database unit;

A handover execution unit which performs handover according to the determination of the handover execution determination unit;

A session management unit which operates the link layer information collecting unit, initializes a session using an IP address assigned to the network interface module first detected by the link layer information collecting unit, or terminates a predetermined session for terminating communication; , And

At the request of the handover performance determining unit, the handover execution unit may be configured to check whether an IP address of the collected link information is in use in the current session or to add, delete, or change the IP address in the current session. And an address setting management unit.

The session manager of the terminal device having the above-mentioned characteristics initializes the session using an IP address assigned to the network interface module first detected by the link layer information collecting unit, or terminates the communication with a preset network interface module. It is desirable to delete the assigned IP address from the current session.

The link layer information collecting unit of the terminal device having the above-described feature

Searching for at least one network interface module installed in the terminal device, real-time monitoring of the searched and verified modules to collect newly activated or deactivated link information, and storing the collected link information in the link information management database. It features.

The handover performance determination unit of the terminal device having the above-described characteristics

Read link information from the link information management database,

If the newly detected network interface module is detected in the read link information, request confirmation to the dynamic address configuration manager whether the IP address assigned to the detected network interface module is used in the current session.

If the IP address is not in use in the current session, request the dynamic address setting manager to add the IP to the current session.

If the signal strength of the read link information is larger than the preset threshold, request the dynamic address setting management unit to change the data transmission path to the IP address.

If it detects the network interface module inactivated in the read link information, it is preferable to request the dynamic address setting management unit to delete from the current session the IP address assigned to the detected network interface module.

The dynamic address setting manager of the terminal device having the above-described feature

If receiving a message requesting to confirm whether the IP address is in use in the current session from the handover performing decision unit, it checks whether the IP address is used in the current session and transmits the result to the handover performing decision unit.

If a message is received from the handover performing decision unit requesting to add an IP address to the current session, the handover execution unit is set to add the IP address to the current session.

If a message requesting to change the IP address to the data transmission path of the current session is received from the handover execution decision unit, the handover execution unit is set to change the data transmission path of the current session to the corresponding IP address.

If receiving a message requesting to delete the IP address from the current session from the handover performance determining unit, it is preferable to set the handover performing unit to delete the IP address from the current session.

The handover execution unit of the terminal device having the aforementioned characteristics

If session initialization is set by the session manager, it initializes a session for communication between the terminal device and the counterpart terminal.

If the dynamic address setting manager is configured to add a new IP address to the current session, the corresponding IP address is added to the current session and notified to the counterpart terminal.

If the dynamic address setting management unit is configured to change the data transmission / reception path of the current session to a new IP address, the data transmission / reception path of the current session is changed to the corresponding IP address and notified to the counterpart terminal.

If the dynamic address setting manager is configured to delete the IP address of the current session, it is preferable to delete the IP address from the current session and notify the counterpart terminal of the IP address.

The terminal device having the above-described feature is equipped with an mSCTP protocol stack, and the session preferably supports the mSCTP protocol.

Another aspect of the present invention relates to a computer-readable recording medium having recorded thereon a program for supporting handover of a mobile terminal device using information of a data link layer.

A link layer information collector configured to collect link information including information related to activation of network interface modules in real time;

A link information management database unit for storing link information collected by the link layer information collecting unit;

A handover performance determination unit determining whether to perform a handover by using link information of the link information management database unit;

A handover execution unit which performs handover according to the determination of the handover execution determination unit;

A session management unit which executes the link layer information collecting unit, initializes a session using an IP address assigned to the network interface module first detected by the link layer information collecting unit, or terminates a preset session for terminating communication; , And

At the request of the handover performance determining unit, the handover execution unit may be configured to check whether an IP address of the collected link information is in use in the current session or to add, delete, or change the IP address in the current session. Including address setting management,

By using link information of the data link layer, it is possible to set up a dynamic address to support handover between different heterogeneous networks.

Hereinafter, with reference to the accompanying drawings, a terminal capable of dynamic address setting capable of supporting mSCTP handover between heterogeneous networks based on information of a data link layer among OSI 7 layers according to an exemplary embodiment of the present invention. The configuration and operation of the device will be described in detail.

FIG. 1 is a block diagram schematically illustrating an entire network system including a terminal device capable of dynamic address setting capable of supporting handover between heterogeneous networks based on information of a link layer according to an exemplary embodiment of the present invention. Referring to FIG. 1, the entire network system 10 is composed of different heterogeneous networks 100 and 110 based on IP, and terminal devices 120 moving along heterogeneous networks are based on information of a link layer. It is equipped with a module and mSCTP stack that enable one dynamic address setting.

The terminal device 120 includes at least one network interface module supporting a network interface therein, and the network interface module includes a portable internet interface module supporting a wireless Internet and a wireless LAN supporting a wireless LAN. LAN interface module, CDMA interface module supporting CDMA communication and the like.

The terminal device 120 that moves a network composed of different heterogeneous networks receives an IP address for communication from a base station in charge of an area (area A) where it is located. The terminal device 120 assigned an IP address searches for network interface modules attached to itself and monitors whether the found modules are activated before starting communication with the counterpart terminal to communicate with. When the terminal device 120 detects an activated network interface module, the terminal device 120 sets an IP address allocated from a base station to a session based on mSCTP. Through this process, the mSCTP session with the counterpart terminal device is initiated using the IP address set and communication is performed. While the communication is in progress, when the terminal device continuously moves to enter a new area B, the network interface module corresponding to the network of the area B among the network interface modules of the terminal device is activated. The terminal device detects this at the link layer and determines whether to perform a handover. If it is determined to perform the handover, the terminal device performs the mSCTP handover using the dynamic address management method.

FIG. 2 is a block diagram schematically illustrating an internal configuration of a terminal device capable of dynamic address setting for supporting handover between heterogeneous networks based on link layer information according to an embodiment of the present invention. Referring to FIG. 2, the terminal device 120 according to the present invention includes a link layer information collecting unit 20, a link information management database 30, a handover performance determining unit 40, a dynamic address setting managing unit 50, It consists of a handover performer 60 and a session manager 70. Hereinafter, the configuration and operation of each component constituting the aforementioned terminal device will be described in detail.

The link layer information collecting unit 20 searches for network interface modules installed in the terminal device, detects network interface modules that are activated or deactivated according to the movement of the terminal device, and collects link information about them in real time. The link information management database 30 is stored.

3 is a flowchart sequentially illustrating a process in which the link layer information collecting unit 20 determines whether the network interface modules of the terminal device are active or inactive. Referring to FIG. 3, after initially discovering network interface modules mounted in a link layer of a terminal device (step 200), the network interface modules that are activated for the first time are monitored by real-time monitoring of the identified network interface modules. Link information about the data is stored in the link information management database 30 (step 210). Next, the network interface modules detected and checked are monitored, and the network interface module newly activated or deactivated is monitored in the link layer of the terminal device in real time (step 220). If the newly activated network interface module is detected (step 230), the link information for the newly activated network interface module is stored in the link information management database (step 240), and then, whether the existing network interface module is deactivated is detected. (Step 250). If the existing network interface module is deactivated, the link information for the deactivated interface module is stored in the link information management database and then terminated (step 260).

The link information management database 30 includes information on network interface modules of the terminal device, information on activated network interface modules, corresponding IP information, signal strength, etc. by the link layer information collecting unit. And so on.

The handover performance determiner 40 reads and analyzes the information stored in the link information management database 30 and then determines whether to perform a handover. The handover performance determiner 40 activates the network according to the movement of the terminal device. The link state information and the signal strength information of the interface module determine whether to perform handover.

Hereinafter, a process of determining whether to perform the handover by the above-described handover performance determiner 40 will be described in detail with reference to FIG. 4. Referring to FIG. 4, the handover performance determination unit 40 reads link information from the link information management database (step 400), and determines whether to perform handover using the read link information (step 410). When a newly activated network interface module is detected from the link information read from the link information management database (step 420), link information of the corresponding interface module is dynamically determined to confirm whether or not to use an IP address corresponding to the detected network interface module. The request is transmitted to the address setting manager to check whether the corresponding IP address is used in the session (step 430).

If it is confirmed by the dynamic address setting management unit that the IP address is not used (step 440), the dynamic address setting management unit is requested to add the IP address to the current session (step 450).

Next, if the signal strength for the newly activated network interface module is greater than the preset threshold (step 460), the data transmission / reception path for communication between the terminal device and the counterpart terminal in the current session is changed to the corresponding IP address. The request is made to the dynamic address setting management unit (step 470).

Next, if it is detected from the received link information that the network interface module corresponding to the IP address being used in the current session is deactivated, the dynamic address setting management unit is requested to delete the IP address from the currently connected session (step 480). ), To end.

The dynamic address setting manager 50 checks whether the IP address for the newly activated network interface module is being used in the current session or determines whether the handover performance determination unit is performing the handover. If not, add it, check or change whether the data transmission / reception path has been changed, and confirm or delete the existing IP address.

Hereinafter, a process of performing a handover by the aforementioned dynamic address setting manager will be described in detail with reference to FIG. 5. Referring to FIG. 5, a request message related to performing a handover is received from a handover performing determiner (step 500). When receiving a message requesting confirmation whether a specific IP address is in use in the current session from the handover performing decision unit (step 510), the dynamic address setting manager verifies whether the IP address is used in the current session, and responds. The message is transmitted to the handover performance determination unit (step 512).

If a message is received from the handover performing determination unit requesting to add the corresponding address to the current session for handover determination (step 520), the dynamic address setting management unit performs the handover to add the corresponding IP address to the current session. Set to negative (step 522).

If the message for requesting to change the IP address from the current session to the data transmission / reception path is received from the handover decision determination unit (step 530), the dynamic address setting management unit determines the data transmission / reception path to the corresponding IP address. Set to the handover execution unit to change to (step 532).

If a message is received from the handover performing decision unit requesting to remove the corresponding IP address from the current session in order to determine whether to perform the handover (step 540), the dynamic address setting management unit removes the IP address from the current session. It sets in the over execution part (step 542).

The handover execution unit 60 performs the actual handover as set by the dynamic address setting management unit and receives a request and response from the counterpart terminal.

Hereinafter, a handover process performed by the handover performing unit will be described in detail with reference to FIG. 6. Referring to FIG. 6, if session initialization is set by the session manager, the handover performer initializes a session for communication between the mobile terminal device and the counterpart terminal.

If the addition of a new IP address to the current session is configured by the dynamic address setting management unit, the handover performer adds the received IP address to the session connected between the mobile terminal device and the counterpart terminal and notifies the counterpart terminal.

If the dynamic address setting management unit is configured to change the data transmission / reception path to a new IP address, the handover execution unit changes the address of the data transmission / reception path with the counterpart terminal to the corresponding IP address and uses the data transmission / reception path of the changed IP address. Request the other terminal to perform communication.

If it is configured to remove the previously used IP address from the current session by the dynamic address setting manager, the handover execution unit deletes the corresponding IP address from the current session and requests the counterpart terminal to delete the corresponding IP address.

The session manager 70 executes the operation of the link layer information collector, initiates a session using the IP address of the first activated network interface module detected by the link layer information collector, and communicates with the counterpart terminal. When the session is terminated, the session with the counterpart terminal ends.

Hereinafter, a process of processing messages received from the mobile terminal apparatus by the counterpart terminal communicating with the mobile terminal apparatus according to the present invention having the above-described configuration will be described sequentially.

Referring to FIG. 7, when the counterpart terminal receives a request message from the mobile terminal device (step 700), the counterpart terminal determines whether to respond to the received request message.

If the mobile station receives a message requesting to add a new IP address to the current session (step 710), the counterpart terminal adds the IP address to the current session and transmits a request confirmation message (step 712).

If the mobile station apparatus receives a message requesting a change of the IP address of the data transmission / reception path (step 720), the counterpart terminal changes the data transmission / reception path to the corresponding IP address and transmits a confirmation message (step 722).

If the mobile terminal receives a message requesting to delete the existing IP address from the current session (step 730), the counterpart terminal deletes the corresponding IP address from the current session and transmits a response message (step 732).

Although the present invention has been described above with reference to preferred embodiments thereof, this is merely an example and is not intended to limit the present invention, and those skilled in the art do not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not possible in the scope. And differences relating to such modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

According to the present invention, even if a separate location management server is not disposed on a network, terminal devices moving through networks of different heterogeneous networks dynamically allocate IP addresses using information of a data link layer. By doing so, it is possible to efficiently support mSCTP handover between heterogeneous networks.

In addition, according to the present invention, as the terminal device moves, detecting activation of a network interface module corresponding to a network corresponding to a new area and dynamically adding an address corresponding to the mSCTP session to provide seamless handover of the session. You can do it.

According to the present invention, it is possible to provide mSCTP-based IP handover by using link layer information in a next-generation All-IP based wireless communication network. In particular, 802.16e-based portable Internet network (Wibro), which is currently in the commercialization stage, is provided. In the interworking network between the WLAN and the WLAN, or the interworking network between the mobile Internet network (Wibro) and the CDMA, it is possible to provide a continuous and automatic mSCTP handover of the mobile terminal.

In addition, since the present invention can provide a handover only by software, when only the mSCTP protocol stack is installed in the mobile terminal and the counterpart terminal, an efficient and automatic handover is achieved by adding software only without additional investment of network equipment. Can be provided.

Claims (8)

A terminal device equipped with at least one network interface module to support handover between different heterogeneous networks, A link layer information collecting unit configured to collect link information including information related to activation of network interface modules in real time; A link information management database unit for storing link information collected by the link layer information collecting unit; A handover performance determination unit that determines whether to perform a handover by using link information of the link information management database unit; A handover performer configured to perform handover according to the decision of the handover performer; A session management unit which operates the link layer information collecting unit, initializes a session using an IP address assigned to the network interface module first detected by the link layer information collecting unit, or terminates a predetermined session for terminating communication; ; And At the request of the handover performance determining unit, the handover execution unit may be configured to check whether an IP address of the collected link information is in use in the current session or to add, delete, or change the IP address in the current session. An address setting manager; Terminal device having a dynamic address setting function for supporting handover between different heterogeneous networks using link information of the data link layer, characterized in that it comprises a. The method of claim 1, wherein the session manager initializes the session using an IP address assigned to the network interface module first detected by the link layer information collector, or assigns a preset network interface module when the communication ends. And a dynamic address setting function for supporting handover between different heterogeneous networks using link information of a data link layer, characterized in that an IP address is deleted from a current session. The method of claim 1, wherein the link layer information collecting unit Searching for at least one network interface module installed in the terminal device, real-time monitoring of the searched and verified modules to collect newly activated or deactivated link information, and storing the collected link information in the link information management database. A terminal device having a dynamic address setting function for supporting handover between different heterogeneous networks by using link information of a data link layer. The method of claim 1, wherein the handover performance determination unit Read link information from the link information management database, If the newly detected network interface module is detected in the read link information, request confirmation to the dynamic address configuration manager whether the IP address assigned to the detected network interface module is used in the current session. If the IP address is not in use in the current session, request the dynamic address setting manager to add the IP to the current session. If the signal strength of the read link information is larger than the preset threshold, request the dynamic address setting management unit to change the data transmission path to the IP address. If the deactivated network interface module is detected in the read link information, the link information of the data link layer is requested to the dynamic address setting management unit to delete the IP address assigned to the detected deactivated network interface module from the current session. Terminal device having a dynamic address setting function for supporting handover between different heterogeneous networks by using a. The method of claim 1, wherein the dynamic address setting management unit If receiving a message requesting to confirm whether the IP address is in use in the current session from the handover performing decision unit, it checks whether the IP address is used in the current session and transmits the result to the handover performing decision unit. If a message is received from the handover performing decision unit requesting to add an IP address to the current session, the handover execution unit is set to add the IP address to the current session. If a message requesting to change the IP address to the data transmission path of the current session is received from the handover execution decision unit, the handover execution unit is set to change the data transmission path of the current session to the corresponding IP address. If a message is received from the handover performing decision unit requesting the IP address to be deleted from the current session, the link information of the data link layer is set to the handover performing unit to delete the corresponding IP address from the current session. Terminal device having a dynamic address setting function for supporting handover between different heterogeneous networks by using. The method of claim 1, wherein the handover performing unit If session initialization is set by the session manager, it initializes a session for communication between the terminal device and the counterpart terminal. If the dynamic address setting manager is configured to add a new IP address to the current session, the corresponding IP address is added to the current session and notified to the counterpart terminal. If the dynamic address setting management unit is configured to change the data transmission / reception path of the current session to a new IP address, the data transmission / reception path of the current session is changed to the corresponding IP address and notified to the counterpart terminal. If the dynamic address setting management unit is configured to delete the IP address of the current session, different heterogeneous networks are used by using the link information of the data link layer, wherein the corresponding IP address is deleted from the current session and notified to the opposite terminal. Terminal device having a dynamic address setting function for supporting handover of the. The heterogeneous manganese according to any one of claims 1 to 6, wherein the terminal device is equipped with an mSCTP protocol stack and the session supports the mSCTP protocol. Terminal device having a dynamic address setting function for supporting handover of the. A link layer information collecting unit configured to collect link information including information related to activation of network interface modules in real time; A link information management database unit for storing link information collected by the link layer information collecting unit; A handover performance determination unit that determines whether to perform a handover by using link information of the link information management database unit; A handover performer configured to perform handover according to the decision of the handover performer; A session management unit which executes the link layer information collecting unit, initializes a session using an IP address assigned to the network interface module first detected by the link layer information collecting unit, or terminates a preset session for terminating communication; ; And At the request of the handover performance determining unit, the handover execution unit is configured to check whether an IP address among the collected link information is in use in the current session, or to add, delete, or change the IP address in the current session. A dynamic address setting manager; And a program for enabling dynamic address setting to support handover between different heterogeneous networks using link information of a data link layer.

Images