JPH0831068B2 - Communication processing method between computer systems, transmitter and receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] Regarding a communication processing method between computer systems connected to a network, a plurality of devices connected to a network are provided for the purpose of implementing different communication protocols on a single communication line. In a data processing system configured to perform data transmission / reception according to a first communication protocol and specify communication resources according to a second communication protocol to perform data transmission / reception. Through the connection on the predetermined layer of the established first communication protocol, the resource name transmission unit for transmitting the communication resource names of the transmission source and the transmission destination, and the connection on the predetermined layer. For the data according to the second communication protocol to be transmitted, the data is added on the first communication protocol. And a header information adding unit for adding header information to the effect that the received communication data is not assigned to the communication resource indicated by the transmitted communication resource name. When an address generation unit that generates address information and data to which header information is added are received, the address information of the communication resource and the predetermined communication protocol of the first communication protocol are used for the data instead of the header information. A header information exchanging unit for adding network address information defined by the address information of the computer system generated upon establishment of the connection on the layer.

[Industrial applications]

The present invention relates to a communication processing method between computer systems connected to a network, and a transmission device and a reception device used in the system, and particularly to a communication protocol for open system interconnection and a communication protocol different from that. The present invention relates to a communication processing method between computer systems that enables implementation of the above in accordance with one communication line, and a transmitter and a receiver used in the system.

As shown in FIG. 6, a plurality of host computer systems 1
Configures a network and executes data processing. In this data processing system, data communication is conventionally performed between the host computer systems 1 according to a unique communication protocol. On the other hand, open system interconnection (OSI) has been proposed as an international standard for computer networks. From now on, in order to make the existing data processing system effective, it is necessary to take measures so that the communication protocol for open system interconnection and the conventional communication protocol can be implemented according to one communication line. .

[Conventional technology]

Conventionally, when data communication is executed between the host computer systems 1 according to different communication protocols, separate communication lines are provided corresponding to the respective communication protocols, and the communication lines are provided via the separate communication lines. A configuration was adopted in which data communication was executed separately. Therefore, when the host system connected to the network uses a communication protocol for open system interconnection and a communication protocol different from that,
It had a configuration in which it was equipped with two lines.

[Problems to be Solved by the Invention]

However, in such a conventional technique, when a communication protocol for open system interconnection is newly provided, the number of lines becomes two and the communication control device provided for the lines also becomes two. However, there is a problem that the system becomes complicated and the system price becomes high.

The present invention has been made in view of such circumstances,
In the data communication processing between host computer systems, the communication processing between the conventional host systems is realized by making it possible to implement the communication protocol for open system interconnection and the communication protocol different from that according to one communication line. The purpose is to solve the problems of the method.

[Means for solving the problem]

 FIG. 1 is a block diagram showing the principle of the present invention.

In the figure, 1a is a sending host computer system connected to the network, 1b is a receiving host computer system connected to the network, and 2 is a sending host computer system.
A communication line connecting 1a and the host computer system 1 on the receiving side, 11 is a source communication resource of the host computer system 1a on the sending side, which is a communication resource for requesting data transmission, and 12 is a host computer on the sending side Communication controller of system 1a,
Reference numeral 13 is an OSI communication control unit included in the communication control unit 12, which executes a communication protocol (first communication protocol) for open system interconnection, and 14 is a resource name transmission unit included in the communication control unit 12. Which transmits the communication resource names of the transmission source and the transmission destination according to the long byte length used for transmitting the message, and 15 is a unique communication control unit included in the communication control unit 12 for communication between open system interconnections. A communication protocol (second communication protocol) different from the protocol is executed. Reference numeral 16 is a header information addition unit included in the unique communication control unit 15 and is data placed on the open type system interconnection. Header information for displaying, 21 is a destination communication resource of the host computer system 1b on the receiving side, which is a communication resource to which the data is transmitted, and 22 is a host computer calculation on the receiving side. Of the communication system 1b, 23 is an OSI communication controller included in the communication controller 22, which executes a communication protocol for open system interconnection, and 24 is a unique communication controller included in the communication controller 22. Which executes a communication protocol different from the communication protocol of the open system interconnection, 25 is a header information exchange unit included in the unique communication control unit 24, and the header added by the header information addition unit 16 Instead of information, add header information to display network address information of source and destination communication resources (address information for identifying communication resources in the host computer + address information for identifying the host computer) The reference numeral 26 denotes an address generation unit included in the communication control unit 22, which is address information of communication resources of a transmission source and a transmission destination (identifies communication resources in the host computer. Notifying the header information exchange unit 25 generates the address information) of the order (if the address information has already been generated, to use it) is intended.

[Action]

In the present invention, when the source communication resource 11 requests data transmission, the OSI communication control unit 13 and the OSI communication control unit 23, the communication control unit 12 and the communication control unit 22 according to the communication protocol of the open system interconnection. Establish a transport connection between. By establishing the transport connection, a transport reference representing the OSI network address is generated, so that a correspondence relationship is established between the sending host computer system 1a and the receiving host computer system 1b.

When the transport connection is established in this way, the resource name transmission unit 14 uses the resource name of the source communication resource 11 and the resource name of the destination communication resource 21 by using, for example, 8 bytes for message transmission. To the communication control unit 22,
Upon receiving the notification of this resource name, the address generation unit 26
Unique address information (address information for identifying communication resources in the host computer) is allocated to the source communication resource 11 and the destination communication resource 21.

On the other hand, the unique communication control unit 15 adds the header information added by the header information adding unit 16 via the established transport connection and transmits the communication data according to its own communication protocol. When the communication data to which the header information is added is received, the address information generated by the address generating unit 26 in place of the added header information and the transmission side host computer system 1a defined by the transport reference.
By adding the network address information defined by the address information of the host computer system 1b on the receiving side as new header information, the OSI communication control units 13 and 23 do not exist, and the unique communication control units 15 and 24 do not exist. The communication data is processed as if the communication data was transmitted and received between them.

As described above, by using the present invention, in the communication processing between the host computer systems, the communication protocol of the open system interconnection and the communication protocol different from that can be implemented according to one communication line. is there.

〔Example〕

 Hereinafter, the present invention will be described in detail according to examples.

FIG. 2 shows a system configuration of a data processing system to which the present invention is applied. For convenience of explanation, this system configuration is shown by extracting two host computer systems connected to the network. In the figure, 1 is a host computer system connected to a network, 2 is a communication line connecting between the host computer systems 1, 3 is a communication controller provided in each host computer system 1, and 4 is managed by each host computer system 1. An application program as a communication resource, 5 is a communication control program for implementing the communication access method of each host computer system 1, 6 is a terminal as a communication resource of each host computer system 1, 27
Is an address correspondence table provided in each host computer system 1.

This address correspondence table 27 is a communication protocol that uses a 2-byte network address provided separately from the communication protocol for open system interconnection (hereinafter,
For convenience of explanation, the resource correspondence table 27 is provided for the processing of the FNA communication protocol, and the resource name of the communication resource and the network address assigned to the communication resource (for the element address described later, the address). Is assigned so as to guarantee uniqueness only in the host computer system 1 to which the server belongs.) Is managed. FIG. 3 illustrates this 2-byte network address used by the FNA communication protocol. In the figure, 30 is a sub-area address for identifying the host computer system 1 connected to the network, and 31 is an element address for identifying the communication resources of the host computer system 1.

Next, the present invention will be described in detail according to the embodiment shown in FIG. In this embodiment, it is assumed that the application program A of the host computer system 1 on the transmitting side transmits data to the application program B of the host computer system 1 on the receiving side.

When the network system is started, the communication control program 5 of the host computer system 1 of the application program A and the application program B sends the ER- to the communication control device 3.
The communication line 2 is transmitted by transmitting the on signal and receiving the DR-on signal which is a response signal to the ER-on signal.
Is set to the usable state. Next, application program A
Communication program 5 of the host computer system 1
(Hereinafter, referred to as the communication control program 5 on the transmission side)
According to the communication protocol of open system interconnection,
The communication control program 5 of the host computer system 1 on the application program B side (hereinafter, the communication control program 5 on the reception side
The SABM signal is transmitted to
A data link is established by receiving a UA signal which is a response signal to the SABM signal.

After the data link is established, when the first call connection request is issued from the application program A to the application program B in accordance with the 2-byte network address, the communication control program 5 on the transmission side causes the open system interconnection In accordance with the communication protocol, a CR packet signal is transmitted to the communication control program 5 on the receiving side, and a CC packet signal which is a response signal to the CR packet signal is received to establish a network connection. According to the CR packet signal transmitted at this time, the host computer system 1 on the transmission side that manages the application program A
Will be notified to the communication control program 5 on the receiving side.

When the network connection is established, the communication control program 5 on the transmission side subsequently transmits a CR-TPDU signal to the communication control program 5 on the reception side according to the communication protocol of the open system interconnection, and
The transport connection is established by receiving the CC-TPDU signal which is a response signal to the CR-TPDU signal. When the transport connection has already been established, the above processing is omitted. By establishing this transport connection, the OS
By generating a transport reference that represents the network address of I (address of the host computer system 1), the host computer system 1 on the transmitting side and the receiving side is generated.
Correspondence will be taken between them.

When the transport connection is established, the communication control program 5 on the transmitting side sends X-ASSOCIATE.REQ (P
As shown by LU name SLU name), the resource name (PLU name) of the application program A that is the communication resource of the transmission source is used by using the 8-byte communication data used for transmitting the message to the operator. ) And the resource name (SLU name) of the application program B, which is the communication resource of the transmission destination, are transmitted to the communication control program 5 on the receiving side, and X-ASSOCIATE.RSP (OK) which is a response signal to this is transmitted. The activation of the application program B is instructed by performing the receiving process.

In this way, when the resource name of the application program A is received, the communication control program 5 on the receiving side assigns the address not registered in the address correspondence table 27 to the resource name of the application program A, and the assigned address. And the address of the host computer system 1 on the transmission side, which is established with the establishment of the transport connection, are registered in the address correspondence table 27 in association with the resource name of the application program A. By this registration process,
The communication control program 5 on the receiving side, for the application program A that is not a communication resource of the host computer system 1 of itself, the address of the host computer system 1 on the transmitting side, which is established along with the establishment of the transport connection, and the address correspondence table. A 2-byte network address is generated from the address associated with the resource name of the application program A registered in 27.

Next, the communication control program 5 on the transmission side sends X-SET-PROFILE.REQ (PL
(U name) signal is transmitted, and by receiving the X-SET-PROFILE.RSP (OK) signal that is a response signal to this signal, the setting process of the FNA communication protocol that has been used conventionally is executed. . Then, the communication control program 5 on the transmitting side first transmits the high-priority data from the application program A according to the X-E-DATA (SDT) signal in accordance with the set FNA communication protocol, and transmits it to this. When the response signal X-E-DATA (+ RSP) is received, the normal data from the application program A is transmitted according to the X-N-DATA (data) signal, and the response to this is sent. The signal X-N-DATA (+ RSP) is received. Subsequently, the communication control program 5 on the transmission side transmits an X-RELEASE.REQ signal to the communication control program 5 on the reception side, and X, which is a response signal to this, is transmitted.
-Releasing the FNA communication protocol used for communication processing by receiving the RELEASE.RSP (OK) signal.

When executing this FNA communication protocol, it is originally necessary to add a 2-byte network address as header information.
As described above, the network address required by the communication control program 5 on the receiving side can be obtained. From now on, when executing this FNA communication protocol, the communication control program 5 on the transmitting side performs processing so as to add header information indicating that the FNA data is put on the open type system interconnection, and receives it. The communication control program 5 on the side processes such that the added header information is removed and replaced with the desired network address. By this processing, the same processing as data communication according to the FNA communication protocol can be performed from the beginning. When executing this FNA communication protocol, header information other than the network address (sequence number, error information, etc.)
Will be added without change from the conventional one.

Then, the communication control program 5 on the transmission side and the communication control program 5 on the reception side release the transport connection established for data transmission according to the DR-TPDU signal and the DC-TPDU signal, and further, all the established connections. When the transport connection of is no longer used, the network connection is released according to the CQ packet signal and the CF packet signal, and at the end of the processing of the network system, the data link is released according to the DISC signal and the UA signal. From this, the usable state of the communication line 2 is released according to the ER-off signal and the DR-off signal, and the processing ends.

As described above, according to the present invention, as shown in FIG. 5, among the communication protocols composed of 7 layers, the communication protocol of the lower level up to the transport layer is the communication of the open system interconnection of the international standard. In addition to configuring the protocol to conform to the protocol and configuring the transport layer to conform to the conventional FNA communication protocol for the upper communication protocol, the communication protocol for open system interconnection and the FNA communication protocol are implemented on a common communication line. It is configured to do.

〔The invention's effect〕

As described above, according to the present invention, in the data communication processing between the host computer systems, the communication protocol of the open system interconnection and the communication protocol different from that can be implemented according to one communication line. become. From now on, even under the open system interconnection, the existing communication resources according to the communication protocol different from the open system interconnection can be used.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a system block diagram of a data processing system to which the present invention is applied, FIG. 3 is a network address block diagram, FIG. 4 is an embodiment of the present invention, FIG. 5 is an explanatory diagram explaining the basic configuration of the present invention, and FIG. 6 is an explanatory diagram of a data processing system to which the present invention is applied. In the figure, 1 is a host computer system, 1a is a sending host computer system, 1b is a receiving host computer system, 11 is a source communication resource, 12 is a communication control unit, 13 is an OSI communication control unit, and 14 is a resource name transmission. Section, 15 is a unique communication control section, 16 is a header information adding section, 21 is a destination communication resource, 22 is a communication control section,
Reference numeral 23 is an OSI communication control unit, 24 is a unique communication control unit, 25 is a header information exchange unit, and 26 is an address generation unit.

Claims (3)

[Claims] 1. A computer system comprising a plurality of computer systems connected to a network, the computer system transmitting and receiving data in accordance with a first communication protocol,
In a data processing system that specifies communication resources in accordance with a second communication protocol and executes data transmission / reception, a computer system (1a) on the transmitting side is established according to the first
Resource name transmission unit (14) for transmitting the communication resource names of the transmission source and the transmission destination via the connection on the predetermined layer of the communication protocol of A header information adding unit (1) for adding header information indicating that the data is put on the first communication protocol to the data complying with the communication protocol.
And an address generation unit (26) for generating address information when the computer system (1b) on the receiving side has no address information assigned to the communication resource indicated by the communication resource name.
And when receiving the data to which the header information is added, the address information of the communication resource and the connection on the predetermined layer of the first communication protocol are established for the data instead of the header information. A communication processing method between computer systems, comprising: a header information exchanging section (25) for adding network address information defined by the address information of the computer system generated in accordance with the above. 2. A transmitting device for transmitting data to both a first communication protocol and a second communication protocol to a receiving device connected via a network, said first established device. A resource name transmission unit (14) for transmitting a communication resource name of a transmission source and a transmission destination through a connection on a predetermined layer of a communication protocol, and the second communication transmitted via the connection on the predetermined layer For the data according to the protocol, the first
And a header information adding section (16) for adding header information indicating that the data is put on the communication protocol of. 3. A receiving device for receiving data transmitted by both a first communication protocol and a second communication protocol from a transmitting device connected via a network, wherein the first established device is used. An address generation unit (26) that generates the address information when the address information is not assigned to the communication resource indicated by the communication resource name transmitted from the transmission device via the connection on the predetermined layer of the communication protocol of ), And when receiving the data added with the header information indicating that the data is in accordance with the second communication protocol, which is transmitted from the transmitting device via the connection on the predetermined layer,
In place of the header information, the data is defined by the address information of the communication resource and the address information of the computer system generated with the establishment of the connection on the predetermined layer of the first communication protocol. A receiver, comprising: a header information exchange section (25) for adding network address information.