JP2001285348A - Communication system for data, transit device for the same, communication device for the same, communication method for the same and storage media - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an efficient data transferring by using radio band efficiently even at moving of the terminal. SOLUTION: In this communication system, at setting of Label, a PV setting part 508 gives Path Vector. A PV analyzer 512 retrieves the given Path Vector. An ER setting part 513 sets the retrieved Path vector as an Explicitly Route. A LSP assignment demand part 510 specifies the Explicitly Route set at the ER setting part 513 so as to set the Label.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system, a data relay device, and a data communication device for performing data transfer using a network.

[0002]

2. Description of the Related Art Wireless / mobile communication and portable information terminals (PD)
A) Mobile computing is known, which effectively cooperates with a computer and communication technology using the Internet or the Internet, and enables processing such as information exchange, collection, search, organization, and storage while moving. . In order to realize a seamless mobile environment in which communication can be performed in the same environment regardless of where the user moves, a network control technique for controlling the movement of the mobile terminal is essential. Hereinafter, a conventional data transfer method will be described using a wired network constituted by wired relay devices R1 to R12 as an example. FIG. 9 shows a configuration example of a system in this network. At this time, the communication terminals (T1) 713 and (T2) 714, and the relay devices (R1) 701, (R2) 702,... (R12) 712
Are shown in FIGS. 10 and 11, respectively. The operation of the prior art will be described with reference to the sequence shown in FIG.

[0003] The communication terminal (T1) 713 to the communication terminal (T1)
2) The transmission data to 714 is sent out on the communication path via the data transmission unit 802 and the communication unit 801 (1001 in FIG. 12). The transmission data transmitted by the communication terminal (T1) 713 onto the communication path is received by the relay device (R1) 701 via the communication unit 901 and the data reception unit 903. Upon receiving this transmission data, the connection destination determination unit 904 determines the connection destination, and the LSP allocation request unit 906 sets the relay device (R12)
An LSP setting message (Label Request) for establishing an LSP (Line Switched Path) with the G.712 is generated and transmitted on a communication path via the data transmission unit 902 and the communication unit 901.

[0004] The label request message transmitted by the relay device (R1) 701 on the communication path is transmitted to the relay device (R2) 7
02 via the communication unit 901 and the data receiving unit 903
It is received by the SP processing unit 905. The LSP processing unit 905 includes:
Analyze the received Label Request message and add a new Lab
An el Request message is generated, and the data transmission unit 90
2. The data is transmitted to a communication path via the communication unit 901.

Hereinafter, similarly, R1 → R1 shown by a solid line in FIG.
R2 → R3 → R4 → R8 → R12 (route 7)
Then, the Label Request message is transferred to the relay device R12 (1002 in FIG. 12). This route 7 is determined by the route information set in each relay device.

[0006] The label request message thus transferred is finally received by the relay device (R12) 712 by the LSP allocation notifying unit 907 via the communication unit 901 and the data receiving unit 903. The LSP allocation notifying unit 907 analyzes the received Label Request message, generates a Label Mapping message, and sends the data to the data transmitting unit 902 and the communication unit 90.
1 through the communication path. At this time, the LSP allocation notifying unit 511 registers the mapped Label in the LSP table 908.

[0007] The Label Mapping message sent by the relay device (R12) 712 onto the communication path is transmitted to the relay device (R8).
708 is received by the LSP processing unit 905 via the communication unit 901 and the data receiving unit 903. LSP processing unit 905
Analyzes the received Label Mapping message, generates a new Label Mapping message, and sends it out to the communication path via the data transmission unit 902 and the communication unit 901.
At this time, the LSP processing unit 905 registers the mapped Label in the LSP table 908.

Each relay device similarly transfers a Label Mapping message, and transmits the Label Mapping message to the relay device (R1) 701.
A Mapping message is transmitted (100 in FIG. 12).
3). The route at this time is the same as the route to which the Label Request message has been transferred, and is a route that follows the route of route 7 in the opposite direction.

The label mapping message thus transferred is finally transmitted to the communication unit 9 by the relay device (R1) 701.
01, received by the LSP allocation request unit 906 via the data receiving unit 903. LSP allocation request unit 906 has received
Label mapping message analyzed and Label mapped
l is registered in the LSP table 908.

Thus, LS for transmitting data from communication terminal (T1) 713 to communication terminal (T2) 714
The setting of P is completed. Thereafter, the communication terminal (T1) 713
The transmission data from the communication device (T2) 714 to the communication terminal (T2) 714 is transmitted from the relay unit via the communication unit 901 and the data reception unit 903 to the LS.
The data is received by the P processing unit 905, transmitted to the communication path via the data transmission unit 902 and the communication unit 901 with reference to the LSP table 908, and transferred to the corresponding relay device or communication terminal (1004 and 1005 in FIG. 12). ). Similarly, transmission data from the communication terminal (T2) 714 to the communication terminal (T1) 713 is transmitted on a communication path via the data transmission unit 802 and the communication unit 801 (1006 in FIG. 12).

[0011] The transmission data transmitted by the communication terminal (T 2) 714 on the communication path is received by the relay device (R 12) 712 via the communication unit 901 and the data receiving unit 903. Upon receiving this transmission data, the connection destination determination unit 904 determines the connection destination, and the LSP allocation request unit 906 transmits the relay device (R1) 7
01, an LSP setting message (Label Request) for opening an LSP is generated, and a data transmitting unit 902,
The data is transmitted to a communication path via the communication unit 901.

The label request message sent by the relay device (R12) 712 on the communication path is transmitted to the relay device (R1)
1711 is received by the LSP processing unit 905 via the communication unit 901 and the data receiving unit 903. LSP processing unit 905
Analyzes the received Label Request message, generates a new Label Request message, and sends it out to the communication path via the data transmission unit 902 and the communication unit 901. Hereinafter, similarly, R12 → R11 → R1 indicated by broken lines in FIG.
The Label Request message is transferred to the relay device R1 via the route 0 → R9 → R5 → R1 (route 8) (FIG. 1).
2, 1007). This route 8 is determined by the route information set in each relay device.

The label request message transferred in this manner is finally transmitted to the communication unit 9 by the relay device (R1) 701.
01, received by the LSP allocation notifying unit 907 via the data receiving unit 903. LSP allocation notifying section 907 has received
Analyzes the Label Request message, generates a Label Mapping message, and sends the data transmission unit 902 and the communication unit 901.
Via the communication path. At this time, the LSP allocation notifying unit 511 registers the mapped Label in the LSP table 908.

The label mapping message transmitted by the relay device (R1) 701 onto the communication path is transmitted to the relay device (R5) 7
05 via the communication unit 901 and the data reception unit 903
It is received by the SP processing unit 905. The LSP processing unit 905 includes:
Analyzes the received Label Mapping message and creates a new Lab
An el Mapping message is generated, and the data transmission unit 90
2. The data is transmitted to a communication path via the communication unit 901. At this time, the LSP processing unit 905 converts the mapped Label to an LSP
Register in the table 908.

Each of the repeaters transfers the Label Mapping message in the same manner, and sends the Label Mapping message to the repeater (R12) 712.
l Mapping message is transmitted (100 in FIG. 12)
8). Since the route at this time is common to the route to which the Label Request message has been transferred, the route follows the route of route 8 in the opposite direction.

The label mapping message thus transferred is finally received by the relay device (R12) 712 by the LSP assignment requesting unit 906 via the communication unit 901 and the data receiving unit 903. The LSP assignment request unit 906 analyzes the received Label Mapping message, and
bel is registered in the LSP table 908.

Thus, the LS for transmitting data from the communication terminal (T2) 714 to the communication terminal (T1) 713
The setting of P is completed.

After that, the transmission data from the communication terminal (T2) 714 to the communication terminal (T1) 713 is transmitted to the LSP via the radio communication unit 901 and the data reception unit 903 by each relay device.
The data is received by the processing unit 905, is referred to the LSP table 908, is transmitted to the communication path via the data transmission unit 902 and the communication unit 901, and is transferred to the corresponding relay device or communication terminal (1009, 1010 in FIG. 12). .

[0019]

However, in the prior art, the communication terminal (T1) 713 is connected to the communication terminal (T1).
2) The data communication path (path 7) of 714 and the communication terminal (T
2) It is general that the communication path (path 8) from the 714 to the communication terminal (T1) 713 is different, and when applied to a wireless system having a common uplink / downlink radio band such as PHS, Alternatively, there is a problem in that a limited radio band is wasted because no one-sided data flows. The communication terminal (T1) 71
3 moves, an LSP for transmitting data from the communication terminal (T1) 713 to the communication terminal (T2) 714.
Can be reset, but the communication terminal (T2) 71
Since the LSP for transmitting data from the communication terminal 4 to the communication terminal (T1) 713 has already been set, there is a problem that data is transmitted to the relay device connected before the movement.

That is, in the prior art, when the communication terminal T1 and the communication terminal T2 perform data communication wirelessly, a wireless device for relaying data, such as the relay devices R1 and R12, has two transmission and reception devices. Since the wireless bands are separately secured, there is a problem that a useless wireless band is secured when applied to a wireless system having a common uplink / downlink wireless band such as PHS or when a terminal moves. There is a problem that data is transferred to the relay device connected before the movement.

[0021] The present invention has been made in view of the above circumstances, and provides a data communication system capable of efficiently using a wireless band and effectively realizing data transfer even when a terminal moves. Data relay device, data communication device,
It is an object to provide a data communication method and a storage medium.

[0022]

According to one aspect of the present invention, there is provided a data communication unit having a data transmitting unit for performing a data transfer process and a data receiving unit for performing a data receiving process. LSP (Label Switched Pa)
th) an LSP having an LSP assignment request unit for making an assignment request
A data transfer unit having an allocation request unit and an LSP processing unit for performing LSP allocation request / notification processing;
And a LSP allocation notifying unit having an LSP allocation notifying unit for notifying the P allocation.
A PV setting unit for giving a V (Path Vector);
The SP allocation notifying unit is configured to include the P included in the LSP allocation request.
A PV analyzer for analyzing a V (Path Vector), an ER setting unit for setting a PV designated by the PV analyzer as an ER (Explicitly Route), and the LSP allocation request unit,
The LSP allocation request unit in the LSP allocation request unit is LS
When the P allocation request is transmitted, the E set by the ER setting unit is set.
A data communication system, wherein R is designated.

According to a ninth aspect of the present invention, in the data communication method, a data communication unit for transmitting and receiving data and an LSP (Label
In a data transfer system including an LSP allocation request unit for performing an allocation request for a Switched Path, a data transfer unit for performing the LSP allocation request / notification process, and an LSP allocation notification unit for performing an LSP allocation notification, The unit sends P to the LSP allocation request.
V. (Path Vector), the LSP allocation notifying unit analyzes the PV included in the LSP allocation request, specifies the specified PV as ER (Explicitly Route), and sets the LSP allocation request unit to the LSP allocation request. When transmitting the ER, the set ER is specified.

According to a tenth aspect of the present invention, there is provided a recording medium, comprising: a data communication unit for performing data transmission / reception processing;
Switched Path), an LSP allocation request unit for performing an allocation request, a data transfer unit for performing the LSP allocation request / notification process, and an LSP allocation notification unit for performing LSP allocation notification.
A recording medium recording a first program used for the data transfer unit and a second program used for the LSP allocation notification unit, wherein the first program is:
The computer sends a PV (Path Vect
or), and the second program causes the computer to execute the PSP included in the LSP allocation request.
The procedure to analyze V and the specified PV to ER (Explicitly
Route), and when the LSP assignment request unit transmits an LSP assignment request,
Record the program that causes the procedure to specify R to be performed.

According to the present invention, when the PV setting unit sets a Label, a Path Vector is assigned, and the PV analysis unit extracts the assigned Path Vector, and outputs an ER (Explicitly Route).
The setting unit sets the extracted Path Vector as the Explicitly Route, and the LSP allocation request unit specifies the Explicitly Route set in the ER setting unit and sets the Label, so that the bidirectional route can be shared. The data communication can be continued even if the terminal moves.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data transfer system according to the present invention will be described below using a network constituted by relay devices R1 to R12 as an example. FIG. 1 shows a configuration example of a system in this network. At this time, the wireless communication terminals (T1) 113 and (T2) 114 and the relay devices (R1) 101, (R2) 102,..., (R12) 11
2 and 3 are shown in FIGS. 4 and 5, respectively.

In this embodiment, the LSP (Label Switched Pat)
h) As a control procedure, LDP (Label Distribution Protocol)
The operation will be described along the sequence shown in FIG.

Before the wireless communication terminal (T1) 113 communicates with the wireless communication terminal (T2) 114, the wireless communication terminal (T1)
1) The LSP allocation request control unit 406 at 113 generates an LSP setting request message and sends it out to the wireless communication path via the data transmitting unit 403 and the wireless communication unit 402 (601 in FIG. 6).

The LSP setting request message transmitted by the radio communication terminal (T1) 113 on the radio communication path is transmitted from the relay apparatus (R1) 101 to the LSP allocation request section 510 via the data communication section 504 and the data reception section 506. Receive.
Upon receiving the LSP setting request message, the LSP allocation request unit 501
LSP setting message (Label Reques
t), the data transmission unit 505 and the data communication unit 504
Via the data communication path.

The label request message transmitted by the relay device (R1) 101 on the data communication path is transmitted to the relay device (R1).
2) 102 is the data communication unit 504, the data reception unit 50
6 and received by the LSP processing unit 507. The LSP processing unit 507 analyzes the received LabelRequest message and generates a new LabelRequest message. At this time, the PV setting unit 508 sets its own device to L as the Path Vector.
Add to abel Request message. LSP processing unit 50
7 sends the Label Request message to which the Path Vector is added to the data communication path via the data transmission unit 505 and the data communication unit 504.

Hereinafter, similarly, R1 indicated by a solid line in FIG.
The Label Request message is transferred to the relay device R12 via a route (route 1) of → R2 → R3 → R4 → R8 → R12 (602 in FIG. 6). This route 1 is determined by the route information set in each relay device.

The label request message thus transferred is finally received by the relay device (R12) 112 by the LSP allocation notifying unit 511 via the data communication unit 504 and the data receiving unit 506. The LSP allocation notifying unit 511 analyzes the received Label Request message and generates an LSP notification message. The generated LSP notification message is sent out onto the data communication path via the data transmission unit 505 and the data communication unit 504 (603 in FIG. 6).

The PV analysis unit 512 receives the Label
Extract the path included in the PathVector included in the Request message. For example, as shown in the sequence shown in FIG. 6, the Path Vector included in the Label Request message received by (R2) 102 includes (R1) 101 as the path, and the Label Request message received by (R3) 103 The included Path Vector contains (R2) 1 as the route.
02, (R1) 101, and (R12) 11
Path included in Label Request message received by 2
In the Vector, (R8) 104, (R4) 10
3, (R3) 103, (R2) 102, (R1) 101
Is included. The path of the extracted Path Vector is specified as an Explicitly Route in the ER setting unit 513. That is, as shown in FIG. 6, the ER setting unit 5 of (R12) 112
13 sets ER = {R8, R4, R3, R2, R1}, and (R8) 1
The ER setting unit 512 of 08 sets ER = {R4, R3, R2, R1}, and thereafter, similarly, the ER setting unit 512 of (R2) 102.
Sets ER = {R1}.

The LSP notification message sent out on the outgoing data communication path by the relay device (R12) 112 is transmitted by the radio communication terminal (T2) 114 to the radio communication unit 402 and the data reception unit 40.
4 and received by the LSP allocation notification control unit 407. L
Upon receiving the LSP notification message, the SP allocation notification control unit 407 generates an LSP response message and sends it out to the wireless communication path via the data transmitting unit 403 and the wireless communication unit 402 (604 in FIG. 6).

The LSP response message sent by the wireless communication terminal (T2) 114 on the wireless communication path is transmitted to the relay device (R1
2) 112 is the data communication unit 504, the data reception unit 50
6, and is received by the LSP allocation notifying unit 511. LS
Upon receiving the LSP response message, the P assignment notifying unit 511 generates a Label Mapping message and sends it out to the data communication path via the data transmitting unit 505 and the data communication unit 504. At this time, the LSP allocation notifying unit 511
Registers the mapped Label in the LSP table 509.

The label mapping message sent by the relay device (R12) 112 onto the data communication path is received by the relay device (R8) 108 by the LSP processing unit 507 via the data communication unit 504 and the data receiving unit 506. LSP
The processing unit 507 analyzes the received Label Mapping message, generates a new Label Mapping message,
The data is transmitted to the data communication path via the data transmission unit 505 and the data communication unit 504. At this time, the LSP processing unit 507
Registers the mapped Label in the LSP table 509.

Each of the relay devices transfers the Label Mapping message in the same manner, and transmits the Label Mapping message to the relay device (R1) 101.
A Mapping message is transmitted (605 in FIG. 6). Since the route at this time is common to the route to which the Label Request message has been transferred, the route following the route of route 1 is reversed, that is, R12 → R8 shown by the broken line in FIG.
A route (route 2) of → R4 → R3 → R2 → R1 is established.

The label mapping message thus transferred is finally received by the relay device (R1) 101 at the LSP allocation requesting unit 510 via the data communication unit 504 and the data receiving unit 506. The LSP assignment request unit 510 analyzes the received Label Mapping message and generates an LSP setting response message. The generated LSP setting response message is transmitted to the data transmission unit 505 and the data communication unit 504.
Via the data communication path (606 in FIG. 6).
At this time, the LSP assignment request unit 510 sends the mapped Lab
el is registered in the LSP table 509.

The LSP setting response message transmitted by the relay device (R1) 101 on the data communication path is transmitted to the terminal (T1) 1
13 via the wireless communication unit 402 and the data reception unit 404, the LSP allocation request control unit 406 receives the data from the wireless communication terminal (T1) 113 to the wireless communication terminal (T2).
The setting of the LSP for transmitting data to 114 is completed.

The LSP of the relay device (R12) 112
The assignment request unit 510 synchronizes with the transmission of the Label Mapping message, and the Explicitly Route specified by the ER setting unit 513.
Is generated, and sent to the data communication path via the data transmission unit 505 and the data communication unit 504.

The label request message transmitted by the relay device (R12) 112 onto the data communication path is received by the relay device (R8) 108 by the LSP processing unit 507 via the data communication unit 504 and the data receiving unit 506. LSP
The processing unit 507 analyzes the received Label Request message, generates a new Label Request message,
The data is transmitted to the data communication path via the data transmission unit 505 and the data communication unit 504.

Each of the relay devices similarly transfers the Label Request message, and sends the Label Request message to the relay device (R1) 101.
The Request message is transferred (607 in FIG. 6). The route at this time is a route designated as an Explicitly Route, that is, R12 → R8 → R4 indicated by a broken line in FIG.
→ R3 → R2 → R1 (route 2).

The label request message thus transferred is finally received by the relay device (R1) 101 by the LSP allocation notifying unit 511 via the data communication unit 504 and the data receiving unit 506. The LSP allocation notifying unit 511 analyzes the received Label Request message, and
An ng message is generated and sent out on the data communication path via the data transmission unit 505 and the data communication unit 504. At this time, the LSP allocation notifying unit 511 sends the mapped Lab
el is registered in the LSP table 509.

The label mapping message transmitted by the relay device (R1) 101 on the data communication path is transmitted to the relay device (R1).
2) 102 is the data communication unit 504, the data reception unit 50
6 and received by the LSP processing unit 507. The LSP processing unit 507 analyzes the received LabelMapping message, generates a new Label Mapping message, and sends it out to the data communication path via the data transmission unit 505 and the data communication unit 504. At this time, the LSP processing unit 507
The mapped Label is registered in the LSP table 509.

Each relay device transfers the Label Mapping message in the same manner, and sends the Label Mapping message to the relay device (R12) 112.
An l Mapping message is transmitted (608 in FIG. 6).
Since the route at this time is common to the route to which the Label Request message has been transferred, the route follows the route opposite to the route 2, that is, the route 1.

The label mapping message thus transferred is finally received by the relay device (R1) 101 at the LSP allocation requesting unit 510 via the data communication unit 504 and the data receiving unit 506. At this time, the LSP allocation request unit 5
Reference numeral 10 registers the mapped Label in the LSP table 509.

Thus, the radio communication terminal (T2) 114
Then, the setting of the LSP for transmitting data to the wireless communication terminal (T1) 113 is completed.

Here, an LSP setting request message and an LSP setting response message are used between the radio communication terminal (T1) 113 and the relay device (R1) 101, and the radio communication terminal (T2) 114 and the relay device (R12) 112 Between, LS
Although the description has been made using the P notification message and the LSP response message, the wireless communication terminal (T1) 113 and the wireless communication terminal (T2) 114 transmit the LDP (LSP assignment request unit 50).
2 and the LSP assignment notification unit 503), a Label Request message is used as it is instead of an LSP setting request message or an LSP notification message, or a Label Mapping message is used instead of an LSP setting response message or an LSP response message. It is also possible. Also, an LSP allocation request unit of the relay device,
Although the LSP allocation notifying unit and the LSP processing unit are separately configured into an LSP allocation request unit, an LSP allocation notifying unit, and a data transfer unit, all may be realized by the LSP processing unit in common.

When data is transmitted from the radio communication terminal (T1) 113 to the radio communication terminal (T2) 114, and when data is transmitted from the radio communication terminal (T2) 114 to the radio communication terminal (T1) 11
When transmitting data to the LSP3, the relay devices receive the data in the LSP processing unit 507 via the data communication unit 504 and the data reception unit 506, refer to the LSP table 509, and execute the data transmission unit 505 and the data communication unit. The data is transmitted to the data communication path via the 504 to transfer the data (609 and 610 in FIG. 6).

By the above processing, the radio communication terminal (T1)
Data transmitted from the wireless communication terminal 113 to the wireless communication terminal (T2) 114 is transferred along a route 1 of R1, R2, R3, R4, R8, and R12 (609 in FIG. 6).
2) Data to be transmitted from 114 to the wireless communication terminal (T1) 113 is transferred via the route 2 of R12 → R8 → R4 → R3 → R2 → R1 (610 in FIG. 6), and bidirectional data transfer Since a common route is set as the route, efficient wireless band allocation can be realized.

When the wireless communication terminal (T1) 113 moves under the control of the relay device (R5) 105, the movement detecting unit 405 of the wireless communication terminal (T1) 113 switches the connected relay device. Then, the LSP assignment request control unit 406 generates an LSP setting request, and uses the same procedure as described above to route 3 (R5 → R6 → R7 → R8) in FIG.
→ R12), Route 4 (R12 → R8 → R7 → R6 → R
By setting the LSP of 5), the bidirectional data communication path can be switched (611 to 621 in FIG. 6). Thereby, even when the wireless communication terminal moves, both the two-way data communication paths can be switched and the wireless band can be used efficiently. Wireless communication terminal (T
1) When both 113 and (T2) 114 move, the route 5 (R5 → R6 → R7 → R8) as shown in FIG.
By setting the LSP of the route 6 (R8 → R7 → R6 → R5), the bidirectional data communication route can be switched.

FIG. 7 is a flowchart showing the operation of the terminal. When the wireless communication terminal, for example, (T1) 113 performs communication with the wireless communication terminal (T2) 114, in step S1, an LSP setting request message is generated before performing communication. Next, in step S5, the generated LSP setting request is transmitted to (T2) 114 via the relay device.
Then, in step S7, a response from (T2) 114 is waited. L from the terminal (T2) 114 via the relay device
Receive the SP setting response.

On the other hand, when the LSP setting request is received in step S1, the LSP setting request is received in step S3.
A setting response is transmitted, and the process proceeds to step S9. If data is to be transmitted in step S9, data transmission processing is performed in step S11. If data is to be received, data reception processing is performed in step S13.

In the case of switching the relay device (for example,
(T1) 113 is a subordinate of (R1) 101 to (R5) 1
05), the process returns to step S5, and the processes of steps S5 to S9 are repeated again.

FIG. 8 is a flowchart showing the operation of the relay device.

In step S21, the relay device sets LS
One of a P setting request message, a Label Request message, and data is received.

When receiving the LSP setting request message,
In step S25, the relay device transmits the L
It is determined whether the message is an SP setting request message. In the case of a message addressed to a subordinate terminal (for example, L from (T1) 113)
If the destination of the SP setting request is a terminal under the control of (R1) 101, an LSP notification message is transmitted in step S27, and a response is waited in step S29.

When an LSP response message is received in step S29, terminal information is registered in step S31, an LSP response message is transmitted in step S33, and the process returns to step S21.

On the other hand, if it is determined in step S25 that the packet is not addressed to a terminal under its control, then in step S35, the path
tor (PV) is set, and in step S37, Label Req
Send uest message. Then, the process waits for a response message in step S39.

In step S39, Label Mapping
Is received, in step S41, the mapped Label is registered in the LSP table 509, and the process proceeds to step S41.
At 43, an LSP response message is transmitted, and at step S44, reception is awaited. Then, in step S46, the mapped Label is registered in the LSP table 509. Then, in step S48,
The label mapping is transmitted, and the process returns to step 21.

On the other hand, upon receiving the Label Request, in step S45, it is determined whether or not the received Label Request message is addressed to a terminal under its control. If it is not for the terminal under the control, in step S47, Path Vecto
r (PV) is set, and in step S49, the LSP Request
The message is transmitted, and in step S51, a response is waited. In step S51, when the Label Mapping is received, in step S53, the mapped L
abel is registered in the LSP table 509, and step S55 is performed.
Generates and transmits a Label Mapping message. Thereafter, the process returns to step S21 to wait for reception.

On the other hand, in step S45, the received
If the Label Request message is addressed to a subordinate terminal,
In step S57, the Path Vector is stored. Then, an LSP notification message is transmitted in step S59. Then, in step S61, a response is waited for. Thereafter, when an LSP response message is received in step S61, in step S63, Mappin
The obtained Label is registered in the LSP table 509, and in step S65, a Label Mapping message is transmitted. Then, the Path Vec stored in step S67
Set tor to ExplicitlyRoute (ER). Then, a Label Request message is transmitted in step S69, and a response is waited in step S71. When the label mapping is received in step S71, the mapped Label is registered in the LSP table 509 in step S73, and the process returns to step S21 to wait for reception.

On the other hand, if data is received in step S21, data transfer processing is performed in step S23, and the process returns to step S21.

In the operation flow of the relay apparatus shown in FIG. 8, steps S25 to S75 have this state transition for each terminal, and in each state transition, the operation in the state of waiting for reception for another terminal is performed. I do.

In the above embodiment, the data transfer when the terminal moves is described as an example. However, the present invention is not limited to this, and the present invention is not limited to this.
It is applicable in data transfer on a P network.

The data communication unit 40 shown in FIG.
1, the LSP allocation notification unit 503 and the data transfer unit 501 shown in FIG. 5 may be configured in the form of a card, and may be configured to be detachable from the wireless communication terminal and the relay device, respectively.

The communication between the relay devices may be wireless or wired.

[0068]

According to the present invention, it is possible to use a common bidirectional data transfer path, and when applied to a wireless communication system, the wireless band can be used efficiently,
Data communication can be continued even when the terminal moves.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first configuration example of a data transfer system according to the present invention.

FIG. 2 is an explanatory diagram showing a second configuration example of the data transfer system according to the present invention.

FIG. 3 is an explanatory diagram showing a third configuration example of the data transfer system according to the present invention.

FIG. 4 shows a data transfer system according to the present invention.
FIG. 3 is a block diagram illustrating a configuration of a wireless communication terminal.

FIG. 5 shows a data transfer system according to the present invention.
FIG. 3 is a block diagram illustrating a configuration of a relay device.

FIG. 6 shows a data transfer system according to the present invention.
FIG. 9 is a diagram illustrating an example of a data transfer sequence.

FIG. 7 is a flowchart showing the operation of the terminal device according to the present invention.

FIG. 8 is a flowchart showing the operation of the relay device according to the present invention.

FIG. 9 is a diagram illustrating a configuration example of a data transfer system according to the related art.

FIG. 10 is a block diagram illustrating a configuration of a wireless communication terminal according to the related art.

FIG. 11 is a block diagram illustrating a configuration of a wireless relay device in the related art.

FIG. 12 is a diagram showing an example of a data transfer sequence in the related art.

[Explanation of symbols]

 T1, T2 Terminal R1 to R12 Relay device 401 Data communication unit 402 Wireless communication unit 403 Data transmission unit 404 Data reception unit 405 Movement detection unit 406 LSP allocation request control unit 407 LSP allocation notification control unit 501 data transfer unit 502 LSP allocation request unit 503 LSP allocation notification unit 504 data communication unit 505 data transmission unit 506 data reception unit 507 LSP processing unit 508 PV setting unit 509 LSP table 510 LSP allocation Request part 511 LSP allocation notification part 512 PV analysis part 513 ER setting part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA03 HA08 HC13 JA11 JL01 JT09 KA05 LB05 LB19 5K033 AA01 CB01 DA17 9A001 BB04 CC05 CC07 JJ12 KK56

Claims (10)

[Claims] An LSP allocation request unit having a data transmission unit for performing data transfer processing and a data reception unit for performing data reception processing, and an LSP allocation request unit for performing an LSP (Label Switched Path) allocation request. A data transfer unit having an LSP processing unit for performing LSP allocation request / notification processing, and an LSP having an LSP allocation notification unit for performing LSP allocation notification
In a data transfer system comprising: an assignment notifying unit, the data transfer unit transmits a PV (Path
The LSP allocation notification unit includes a PV analysis unit that analyzes a PV (Path Vector) included in the LSP allocation request, and a PV specified by the PV analysis unit as an ER (E
xplicitly route) and the LS setting section and the LS
A P allocation request unit, wherein the LSP allocation request unit in the LSP allocation request unit is LS
When the P allocation request is transmitted, the E set by the ER setting unit is set.
A data communication system, wherein R is designated. 2. An LSP for requesting / notifying LSP allocation
The data transfer apparatus according to claim 1, wherein the data transfer unit includes a data transfer unit having a processing unit, wherein the data transfer unit includes a PV setting unit that assigns a PV to an LSP allocation request. Data relay device. 3. An LSP allocation request unit including a data communication unit having a data transmission unit for performing a data transmission process and a data reception unit for performing a data reception process, and an LSP allocation request unit for performing an LSP allocation request. The data communication device used in the data transfer system according to claim 1, wherein: 4. An LSP allocation notification in a data communication apparatus comprising a data communication unit having a data transmission unit for performing data transmission processing and a data reception unit for performing data reception processing, and an LSP allocation notification unit for performing LSP allocation notification. The unit analyzes the PV included in the LSP allocation request by using a PV analysis unit and a PV specified by the PV analysis unit.
And an LSP assignment request unit, wherein the LSP assignment request unit in the LSP assignment request unit is LS
When the P allocation request is transmitted, the E set by the ER setting unit is set.
The data communication device used in the data transfer system according to claim 1, wherein R is designated. 5. An LSP allocation request unit having an LSP allocation request unit for making an LSP allocation request, and an LSP allocation request /
2. The data relay device according to claim 1, wherein the data transfer unit includes a data transfer unit having an LSP processing unit that performs notification processing, wherein the data transfer unit includes a PV setting unit that assigns a PV to an LSP allocation request. Data relay device used in the transfer system. 6. A data communication device comprising a data communication unit having a data transmission unit for performing a data transmission process and a data reception unit for performing a data reception unit, wherein the LSP allocation request unit of the data relay device according to claim 5 is provided. The data communication device used in the data transfer system according to claim 1, further comprising an LSP allocation request control unit for controlling. 7. A data relay device comprising a data transfer unit having an LSP processing unit for performing a request / notification process of LSP allocation and an LSP allocation notification unit for performing LSP allocation notification, wherein the LSP allocation notification unit comprises: A PV analysis unit for analyzing the PV included in the request, and an E for setting the PV designated by the PV analysis unit as ER
An R setting unit; and the LSP allocation request unit, wherein the LSP allocation request unit in the LSP allocation request unit is LS
When the P allocation request is transmitted, the E set by the ER setting unit is set.
The data relay device used in the data transfer system according to claim 1, wherein R is designated. 8. An LSP for controlling an LSP allocation notifying unit of a data relay device according to claim 7, wherein said data communication device includes a data communication unit having a data transmission unit for performing a data transmission process and a data reception unit for performing a data reception process. The data communication device used in the data transfer system according to claim 1, further comprising an assignment notification control unit. 9. A data communication unit for transmitting and receiving data, and an LSP for requesting assignment of an LSP (Label Switched Path)
In a data transfer system including an allocation request unit, a data transfer unit for performing the LSP allocation request / notification process, and an LSP allocation notification unit for performing the LSP allocation notification, the data transfer unit may include a PV ( P
the LSP allocation notifying unit analyzes the PV included in the LSP allocation request, specifies the specified PV as ER (Explicitly Route), and the LSP allocation request unit transmits an LSP allocation request. A data communication method, wherein the set ER is specified when performing the data communication. 10. A data communication unit for performing data transmission / reception processing, and an LSP for requesting an allocation of an LSP (Label Switched Path).
A data transfer unit configured to perform an LSP allocation request / notification process; and an LSP allocation notification unit configured to perform an LSP allocation notification, wherein a first program used for the data transfer unit, A recording medium recording a second program used for an LSP allocation notifying unit, wherein the first program causes a computer to execute a procedure of adding a PV (Path Vector) to the LSP allocation request, A program for analyzing a PV included in the LSP assignment request; a procedure for setting a designated PV as an ER (Explicitly Route); and transmitting the LSP assignment request to the LSP assignment request unit. A computer-readable recording medium for executing a procedure for specifying the set ER.