JPH08181713A - Position registration method and system thereof - Google Patents

Abstract

PURPOSE: To attain sure position registration of a mobile terminal equipment by informing a moving end message to a 1st sub-network before movement via a 2nd sub-network. CONSTITUTION: A terminal identifier management server 614 receiving a message 615 from a mobile terminal equipment 608 selects an identifier depending on a sub-network not in use at present and informs a position identifier depending on the sub-network to a mobile terminal equipment 608 as a connection end message 616 and stores sets of a logic identifier independently of the sub- network to which the mobile terminal equipment 608 is connected at present and a position identifier depending on the sub network informed to the mobile terminal equipment 608. Upon the receipt of the connection end message 616 from a terminal equipment identifier management server 614, the mobile terminal equipment 608 updates the identifier depending on the sub network in the sub network 601 possessed by the mobile terminal equipment 608 before movement and makes connection procedure to the sub network 602.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location registration method in a computer network, and more particularly to a computer network in which a plurality of sub-networks are connected to each other by a repeater and a mobile terminal moves between the plurality of sub-networks. In, the present invention relates to a location registration method required to support mobile terminals.

[0002]

2. Description of the Related Art Conventionally, in this kind of computer network, in order to support mobile terminals, an address (logical address) for identifying the terminal itself regardless of the position of the terminal and an address (position address) dependent on the position of the terminal ) Is known (for example, Fumio Teraoka, Yasuhiko Yokote, Mario Tokoro, “Transportability of Hosts in Wide Area Network”, Computer Software, Vol. 9, No. 3 (1992), pp50-6
4).

Conventionally, in a computer network that uses two addresses as described above, when a mobile terminal moves, the location address that the mobile terminal used before the movement is completed is compared to the subnetwork before the movement. A disconnection procedure is being performed to notify the sub-network before moving that it cannot be used.

FIG. 9 is a flowchart showing a processing procedure of the disconnection procedure in the mobile terminal.

It is always confirmed whether or not there is a power-off interrupt (step 200). When moving, the connected network is monitored (step 201) to check whether the connected network changes (step 202). If the connection network does not change, the process returns to step 200 and the above operation is repeated. When the connection network changes, a disconnection procedure is performed to notify the pre-movement network that the previously used location address is unavailable (step 20).
3) For the moved network to which a new location address is assigned, a connection procedure for notifying the logical address is performed (step 204).

In the case of the procedure shown in FIG. 9, information about which sub-network the mobile terminal is currently connected to and information about whether the mobile terminal has moved to another sub-network are required. The mobile terminal can know the movement of the subnetwork to which the mobile terminal is currently connected and the movement by detecting the physical line, detect the movement in this way, and further detect the detection result. The disconnection procedure is performed on the sub-network before and after the move by.

[0007]

However, when it is detected that the mobile terminal has moved to a new sub-network, such as when the mobile terminal is connected by a wireless line,
It may not be possible to connect to the sub-network before moving. In such a case, there is a problem that the disconnection procedure in the network before the movement cannot be normally performed by the conventional method as described above.

The present invention has been made in view of the problems of the above-described conventional techniques, and ensures the location registration of a mobile terminal even if the mobile terminal moves between sub-networks. It is an object of the present invention to realize a location registration method and method capable of performing.

[0009]

According to the location registration method of the present invention, in a network in which a plurality of sub-networks are mutually connected by a repeater and a mobile terminal moves between the plurality of sub-networks, the first sub-network is provided. A location registration method performed when an existing mobile terminal moves to a second sub-network, wherein the mobile terminal detects a) that the mobile terminal has moved to the second sub-network, and b) the second sub-network. And a disconnection procedure for notifying a movement completion message to the pre-movement first subnetwork via the second subnetwork. Is performed.

According to the location registration method of the present invention, in a network in which a plurality of sub-networks are mutually connected by a repeater and the mobile terminal moves between the plurality of sub-networks, the mobile terminal existing in the first sub-network is the first. A location registration method performed when moving to a second sub-network, wherein the mobile terminal: a) means for detecting that the mobile terminal has moved to the second sub-network; Means for performing a connection procedure for notifying a movement notification message, and c) performing a disconnection procedure for notifying a movement completion message to the pre-movement first sub-network via the second sub-network And means.

In this case, the mobile terminal: a) does not depend on the position of the mobile terminal, and does not change even if the mobile terminal moves between a plurality of sub-networks;
And b) a second terminal identifier that changes as the mobile terminal moves between a plurality of sub-networks, and detection may be performed using each of these identifiers. .

Further, each of the plurality of sub-networks may include a) a sub-network identifier for identifying each of the sub-networks, and b) means for periodically reporting the sub-network identifier. .

The mobile terminal further comprises: a) means for receiving the subnetwork identifier, b) means for storing the received subnetwork identifier as a current subnetwork identifier, and c) the current subnetwork identifier and the current subnetwork identifier. Means for comparing the received sub-network identifier and detecting that the mobile terminal has moved to a different sub-network if the current sub-network identifier and the received sub-network identifier are different; ,
May be included.

Further, the subnetwork has: a) means for receiving a movement notification message from the mobile terminal, b) means for receiving a movement completion message from the mobile terminal, and c) the mobile terminal that has transmitted the movement notification message. A means for newly allocating a second terminal identifier, d) means for transmitting the movement completion message based on the movement notification message when the movement notification message is received, and e) the movement completion message And a means for releasing the allocation of the second terminal identifier on the basis of the movement completion message, the terminal identifier management server may be provided.

Further, the means for notifying the sub-network identifiers: a) As the sub-network identifiers of the respective sub-networks, the sub-network identifiers and the identifiers of the terminal identifier management servers managing the respective sub-networks are notified as a pair. Good.

Further, the movement notification message includes: a) a first terminal identifier, b) a second terminal identifier, c) a subnetwork identifier for identifying the first subnetwork, and d) the first subnetwork. The identifier of the terminal identifier management server existing in the network may be included.

Further, the means for performing the disconnection procedure includes: a) the terminal management server managing the second sub-network 2 notifies the terminal identifier management server managing the first sub-network of a movement completion message. May be

Further, the movement completion message may include a) a subnetwork identifier for identifying the second subnetwork, and b) a first mobile terminal identifier.

[0019]

In the present invention, when a mobile terminal moves to a different sub-network, the disconnection procedure for the sub-network before the movement is performed through the sub-network after the movement.
Therefore, even when the terminal moves and the mobile terminal cannot communicate with the pre-movement sub-network, the disconnection procedure in the pre-movement sub-network can be normally performed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing an operation of a mobile terminal according to an embodiment of the present invention. The operation of this embodiment will be described with reference to FIG.

In FIG. 1, step 100 is a mobile terminal power-off interrupt detection step, step 101 is a connection network monitoring step, step 102 is a connection network change detection step, step 103 is a connection step to a post-movement subnetwork, step 104.
Is a disconnection step to the pre-movement subnetwork.

In the power-off interrupt detection step 100, it is detected whether the power of the mobile terminal is turned off,
When the power of the mobile terminal is turned off, the communication is ended and all the flows are ended. If it is confirmed in the power-off interrupt detection step 100 that the power-off interrupt does not occur, the network monitor step 1
By 01, the network is monitored to obtain information on which sub-network the mobile terminal is currently connected to.

Here, the mobile terminal has two identifiers, an identifier (location identifier) that depends on the sub-network to which the mobile terminal is currently connected and an identifier (logical identifier) that does not depend on the sub-network to which the mobile terminal is currently connected. .

Assuming that the above-mentioned two identifiers are, for example, the identifiers of the terminals based on the Internet protocol (IP) hierarchized in the network identification unit and the terminal identification unit, as shown in FIG. The location identifier 300 of the mobile terminal is composed of a currently connected subnetwork address 302 and a host address 303 for identifying the terminal within the subnetwork, and the logical identifier 301 is a subnetwork (home network) that manages the mobile terminal. The address 304 and the host address 305 for identifying the mobile terminal in the home network
Can consist of:

Network monitor step 10
1 can be realized as follows by using the network model shown in FIG. 3, for example. In FIG. 3, 400 to 402 are bus-shaped sub-networks, 40
3, 404 are relays connecting the sub-networks 400 to 402, and 405 to 407 are sub-networks 400 to
A sub-network identifier notifying server that periodically notifies each sub-network identifier of 402, and periodically broadcasts the sub-network identifiers to the sub-networks 400 to 402, respectively. Reference numeral 408 is a mobile terminal, and reference numerals 409 to 411 are subnetwork identifiers notified by 405 to 407 by the subnetwork identifier notification server.

As the sub-network identifiers 409 to 411, the sub-network address 302 in connection in FIG. 2 defined by the sub-networks 400 to 402 can be used. The mobile terminal 408 connected to the sub-network 401 can identify the currently connected sub-network by receiving the sub-network identifier 410 broadcast by the sub-network 401.

In the model shown in FIG. 3, when the mobile terminal 408 connected to the sub-network 401 moves to another sub-network, for example, the sub-network 400, the mobile terminal 408 detects the connection network change detection shown in FIG. Step 102 detects that the connected sub-network has changed.

The connecting network detecting step 102 in the mobile terminal can be realized based on the flowchart shown in FIG.

In FIG. 4, (a) is a flowchart showing the operation of the mobile terminal 408 in the initial state, and (b) is a flowchart showing the operation in the steady state.

First, the operation of the mobile terminal 408 in the initial state will be described with reference to FIG.

The mobile terminal 408 is the subnetwork 40.
When the power is turned on at 0, the subnetwork 40
The received signal flowing to 0 is monitored (step 501),
It is confirmed whether or not the sub network identifier is received from the sub network identifier notification server 405 (step 502). When the receipt of the sub-network identifier is confirmed, the sub-network identifier is stored as the currently connected sub-network (step 503). As described above, when the current connected subnetwork identifier is stored, the mobile terminal enters the steady state operation shown in the flowchart of FIG.

In the steady state, when the mobile terminal 408 has completed the initial state in the sub-network 400 and is still connected, the signal flowing to the sub-network 400 is monitored (step 511) and the sub-network identifier notifying server 405 It is confirmed whether the subnetwork identifier of is received (step 51).
2). When the reception of the sub-network identifier is confirmed, it is confirmed whether the received sub-network identifier is the same as the stored sub-network identifier (step 513).
The operations 1 to 513 are repeated. If the received sub-network identifier is different from the stored sub-network identifier, the stored sub-network identifier is updated to a new sub-network identifier (step 514) and the process ends.

The operation of the mobile terminal which operates according to the above-mentioned flowchart will be specifically described with reference to FIG.

The mobile terminal 408 is the subnetwork 401.
When moving to, the mobile terminal 408 cannot receive the sub-network identifier notified from the sub-network identifier notification server 405, and receives the sub-network identifier notified from the sub-network identifier notification server 406. At this time, the subnetwork identifier received by the mobile terminal 408 from the subnetwork identifier notification server 406 is different from the stored subnetwork identifier. The mobile terminal 408 uses the stored subnetwork identifier as the subnetwork identifier notification server 406.
Updated to the new subnetwork identifier obtained from
Judge that you have moved to a different subnetwork.

As described above, when it is detected that the mobile terminal has moved to a different sub-network, the mobile terminal connects to the sub-network after the moving step 103 (FIG. 1).
By referring to (1), the subnetwork after the movement is notified that the subnetwork has moved, and the subnetwork after the movement is connected.

The step 103 of connecting to the sub-network after the movement can be realized as follows by using the network model shown in FIG. 5, for example.

In FIG. 5, reference numerals 600 to 602 are bus-shaped sub-networks, 603 and 604 are relays connecting the sub-networks, and 605 to 607 are periodic notifications of the respective sub-network identifiers of the sub-networks 600 to 602. Sub-network identifier notification server,
608 is a mobile terminal, 609 to 611 are sub-network identifiers to be notified, 612 to 614 are terminal identifier management servers, 615 is a movement notification message, and 616 is a connection completion message.

The mobile terminal 608 is a subnetwork 601.
The case of moving from the network to the sub-network 602 will be described as an example.

Subnetwork identifier notification server 606
Notifies the subnetwork identifier for identifying the subnetwork 602 and the identifier of the terminal identifier management server 614 as one subnetwork identification message. The mobile terminal 608 is the sub-network identifier notification server 6
When the sub-network identification message from 06 is received, the connected network detection means 102 knows that the sub-network 602 has been moved and the identifier of the terminal identifier management server 614.

The mobile terminal 608 requests the location identifier 300 (see FIG. 2) depending on the sub-network in the sub-network 602 by transmitting the movement notification message 615 to the terminal identifier management server 614. Move notification message 615 from mobile terminal 608
The terminal identifier management server 614 that has received the message selects an identifier that is dependent on the sub-network that is not currently used, notifies the location identifier 300 that is dependent on the sub-network to the mobile terminal 608 as a connection completion message 616, and also notifies the mobile terminal 608. A pair of the logical identifier 301 that does not depend on the currently connected sub-network and the location identifier 300 that depends on the sub-network notified to the mobile terminal 608 is stored. The mobile terminal 608 receives the connection completion message 616 from the terminal identifier management server 614.
When the mobile terminal 608 receives the request, the mobile terminal 608 updates the sub-network-dependent identifier 300 in the sub-network 601 that the mobile terminal 608 had before moving, and performs a connection procedure to the sub-network 602.

As described above, after the connection to the sub-network after the movement is completed, the disconnection step 104 (see FIG. 1) to the sub-network before the movement disconnects the connection with the sub-network before the movement. The location registration of the mobile terminal is completed.

The disconnection step 104 to the pre-movement sub-network can be realized as follows by using the network model shown in FIG. 6, for example.

In FIG. 6, reference numerals 700 to 702 are bus-shaped sub-networks, 703 and 704 are relays connecting the sub-networks, and 705 to 707 are periodic notifications of the sub-network identifiers of the sub-networks 700 to 702. Sub-network identifier notification server,
Reference numeral 708 is a mobile terminal, 709 to 711 are subnetwork identifiers to be notified, 712 to 714 are terminal identifier management servers, 715 is a movement completion message, 716 is a movement notification message, 717 is a connection completion message, and 718 is a confirmation message. The mobile terminal 708 sends the move notification message 716 as follows:
1) Identifier-Terminal identifier management server 7 of the sub-network before moving
13 identifiers-The terminal identifier management server 714 is notified of a message including the logical identifier 301 that the mobile terminal 708 does not depend on the currently connected sub-network. A state transition diagram showing an embodiment of the terminal identifier management servers 712 to 714 is shown in FIG. 7, and the disconnection operation to the pre-movement subnetwork will be described with reference to FIGS. 6 and 7.

The terminal identifier management server 714 is in the reception waiting state (800) and receives the movement notification message 716 (transition 804 by receiving the movement notification message).
And as the sub-network dependent position identifier 300 in the sub-network 702 of the mobile terminal 708,
For example, referring to the terminal identifier management table 900 as shown in FIG. 8, an identifier dependent on a sub-network not currently used by the sub-network 702 is assigned (80
1). Furthermore, with respect to the terminal identifier management server 713 in the sub-network 701 in which the mobile terminal 708 existed before the movement, the sub-network after the movement (the sub-network 70
2) Identifier-Mobile terminal 70 selected by the terminal identifier management server 714
8 subnetwork 702 dependent on the currently connected subnetwork location identifier 300. Sending a migration complete message 715 including a logical identifier 301 that does not depend on the currently connected subnetworks of the mobile terminal 708 (movement complete) Transition 808 due to message transmission. When the terminal identification management server 713 receives the movement completion message 715 (transition 806 by the reception of the movement completion message), the mobile terminal 708 sub-subscribes based on the identifier 301 that does not depend on the currently connected sub-network of the mobile terminal 708. The sub-network-dependent identifier 301 that was used when it was present in the network 701 is detected, and the movement that the terminal identification management server 714 included in the movement completion message 715 selects the detected sub-network-dependent identifier 301 The identifier 300 depending on the currently connected sub-network in the sub-network 702 of the terminal 708 is updated (terminal identification table update 802). When this update operation is completed, the terminal identifier management server 713
To the terminal identifier management server 714, a confirmation message 718 including a logical identifier 301 that does not depend on the currently connected subnetwork of the mobile terminal 708
It is transmitted as a response of No. 5 (transition 807 by transmission of confirmation message). The terminal identifier management server 714 receives the confirmation message 718 (transition 808 due to reception of the confirmation message), and then knows that the mobile terminal 708 has completed disconnection in the pre-movement subnetwork, and the terminal identifier management server 714 determines that the terminal identifier In the management table 900,
The identifier assigned in the assignment state 801 of the terminal identifier 2 (location identifier 300 depending on the subnetwork in the subnetwork 702 of the mobile terminal 708) and the logical identifier 301 that does not depend on the currently connected subnetwork of the mobile terminal 708. Set the pair. Further, the terminal identifier management server 714 uses the confirmation message 7
After receiving 18, the connection completion message 717 is transmitted to the mobile terminal 708, and the state shifts to 800 (805).

In the present embodiment described above, the terminal identifier management server 714 notifies the terminal identifier management server 713 of the movement completion message, but the mobile terminal 708 may also notify the terminal identifier management server 713. It is possible.

[0046]

Since the present invention is configured as described above, in a network in which a plurality of sub-networks are interconnected by a repeater, even if the mobile terminal moves between the sub-networks, the mobile terminal There is an effect that the location registration of can be performed normally.

[Brief description of drawings]

FIG. 1 is a flowchart showing the operation of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of an address for identifying a mobile terminal.

FIG. 3 is a diagram showing a network model for explaining an embodiment of a network monitor means.

4A and 4B are flowcharts showing the operation of the mobile terminal in the embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a network model for explaining a connection operation to a sub-network after moving.

FIG. 6 is a diagram showing a configuration of a network model for explaining a disconnection operation to a sub-network after moving.

FIG. 7 is a state transition diagram showing the operation of an embodiment of the terminal identifier management server.

FIG. 8 is a table showing an example of a terminal identifier management table.

FIG. 9 is a flowchart showing an operation of a conventional example.

[Explanation of symbols]

100 to 104 Step 300 Location identifier 301 Logical identifier 302 Address of currently connected subnetwork 303 Address to identify terminal in currently connected subnetwork 304 Sub that home terminal does not depend on connected subnetwork Address of network 305 Address for identifying terminal in home sub-network 400-402 Sub-network 403,404 Repeater 405-407 Sub-network identifier notification server 408 Mobile terminal 409-411 Sub-network identifier 501-503, 511-514 Step 600 -602 Sub-network 603,604 Repeater 605-607 Sub-network identifier notification server 608 Mobile terminal 609-611 Sub-network identifier 612-61 Terminal identifier management server 615 Movement notification message 616 Connection completion message 700 to 702 Sub network 703, 704 Repeater 705 to 707 Sub network identifier notification server 708 Mobile terminal 709 to 711 Sub network identifier 712 to 714 Terminal identifier management server 715 Movement completion message 716 Move notification message 717 Connection completion message 718 Confirmation message 800 Reception waiting state 801 Terminal identifier 2 allocation state 802 Terminal identifier management table update state 803 Confirmation message waiting state 804 Transition due to reception of movement notification message 805 Transmission of completion message to mobile station By 806 Transition by reception of movement completion message 807 Transition by transmission of confirmation message 808 To other terminal identification management server Transition According have sent movement completion message

Claims (10)

[Claims] 1. In a network in which a plurality of sub-networks are connected to each other by a repeater and a mobile terminal moves between the plurality of sub-networks, a mobile terminal existing in a first sub-network moves to a second sub-network. The location registration method performed when the mobile terminal performs: a) the mobile terminal detects that the mobile terminal has moved to the second sub-network, and b) notifies the second sub-network of a movement notification message. A location registration method, comprising: performing a connection procedure; and c) performing a disconnection procedure for notifying a movement completion message to the pre-movement first sub-network via the second sub-network. 2. In a network in which a plurality of sub-networks are mutually connected by a relay and a mobile terminal moves between the plurality of sub-networks, a mobile terminal existing in a first sub-network moves to a second sub-network. The location registration method performed when the mobile terminal performs the following: a) means for detecting that the mobile terminal has moved to the second sub-network; and b) a movement notification message to the second sub-network. A means for performing a connection procedure for notifying, and c) means for performing a disconnection procedure for notifying a movement completion message to the first sub-network before movement via the second sub-network. A location registration method characterized by. 3. The location registration system according to claim 2, wherein the mobile terminal: a) does not depend on the location of the mobile terminal, and does not change even when the mobile terminal moves among a plurality of sub-networks. 1
And b) a second terminal identifier that changes as the mobile terminal moves between a plurality of sub-networks, and the detection is performed using each of these identifiers. A characteristic location registration method. 4. The location registration method according to claim 2, wherein each of the plurality of sub-networks is a) a sub-network identifier for identifying each of the sub-networks, and b) the sub-network identifier. A location registration method characterized by having means for periodically informing. 5. The location registration method according to claim 4, wherein the mobile terminal comprises: a) means for receiving a subnetwork identifier, and b) means for storing the received subnetwork identifier as a current subnetwork identifier. c) comparing the current sub-network identifier with the received sub-network identifier, and if the current sub-network identifier and the received sub-network identifier are different, the mobile terminal is Means to detect that you have moved to the network,
A location registration method characterized by having. 6. The location registration method according to claim 3, wherein the sub-network includes: a) means for receiving a movement notification message from the mobile terminal, b) means for receiving a movement completion message from the mobile terminal, and c. ) Means for newly allocating a second terminal identifier to the mobile terminal which has transmitted the movement notification message, and d) When the movement notification message is received, the movement completion message is transmitted based on the movement notification message. And a means for releasing the allocation of the second terminal identifier on the basis of the movement completion message when the movement completion message is received. Registration method. 7. The location registration method according to claim 6, wherein the means for notifying the sub-network identifier comprises: a) a sub-network identifier for each sub-network, and a terminal identifier management server for managing each sub-network. A location registration method characterized in that the identifiers of the above are notified in pairs. 8. The location registration method according to claim 5, wherein the movement notification message comprises: a) a first terminal identifier, b) a second terminal identifier, and c) a first terminal identifier. Location registration system, which comprises: a subnetwork identifier for identifying the subnetwork of d); and d) an identifier of a terminal identifier management server existing in the first subnetwork. 9. The location registration method according to claim 6, wherein the means for performing the disconnection procedure comprises: a) a terminal management server that manages the second sub-network 2 sets up the first sub-network. A location registration method characterized in that a movement completion message is notified to a terminal identifier management server to be managed. 10. The location registration method according to claim 7, wherein the movement completion message is a) a subnetwork identifier for identifying the second subnetwork, and b) the first mobile terminal. A location registration method characterized by including an identifier and.