JPH0381852A - Connection control system - Google Patents

Abstract

PURPOSE:To easily determine a connection information area by securing the control information area of a connection and using the address of the secured area as a self-connection identifier (ID) by an ID setting means. CONSTITUTION:An area securing means 1 started by a connection setting request 101 outputted from a user's program 8 acquires a connection information area 5 and transfers its address (a) to the ID setting means 2. The means 2 constructs a connection setting request telegram 103. At the time of executing the construction, the address (a) of the area 5 is stored in a transmitting reference field 31, a 103 is sent to an other communicated station through a transmission part 6 and a terminated connection ID field 51 in the area 5 is initialized. At the time of receiving the telegram from the terminated station through a receiving part 7 in the area deciding means 3, the area 5 concerned is determined based upon the contents of a destination reference field 42 in the and when the field 51 is zero, the telegram is transferred to the means 2 to strat the means 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a connection in a communication protocol that uniquely identifies a connection between devices such as terminals of a data communication system using both information of the own connection identifier and the other party's connection identifier. Regarding management methods.

[Conventional technology]

Conventionally, this type of connection management method reserves a predetermined number of connection control information areas necessary for controlling one connection in consecutive areas, and then records the used/unused status within each area. , the connection identifier (generally a sequential number, etc.) is recorded, and when a connection is established, an unused area is searched to determine the connection identifier, and when a message is received from the other party, the connection identifier in the message and the Search for areas with the same value and confirm that they are in use.

In some cases, the connection control information area is determined by multiplying the value of the connection identifier in the message by the size of the area and adding the base address of the table.

Furthermore, in a system where the number of connections established varies widely depending on the time of day, the method described above may contain only a pointer to an area that stores the used/unused status, connection identifier, and other information about the connection. We are using this together to reduce the area.

[Problem to be solved by the invention]

The conventional connection management method described above only supports a predetermined number of connections, so in systems where the number of connections established varies widely depending on the time of day, etc., the use of continuous connection control information areas is inefficient. When peak special connection establishments are concentrated, connections other than the number of connections determined by system generation etc. are made to wait, and requests for reconnection occur at regular intervals, resulting in network congestion. Additionally, there are drawbacks such as the need to regenerate the system in response to complaints that connections often cannot be established.

Furthermore, in the conventional technology, when establishing a connection and receiving a message, the connection control information area is sequentially scanned based on the connection identifier in the message, which has the disadvantage of increasing the load on the computer in a system that supports a large number of connections.

[Means to solve the problem]

The connection management method of the present invention has self-connection knowledge,
In a communication control device that processes a communication protocol that uniquely identifies a connection based on both the bessier and the other party's connection identifier information, the connection required to control one connection before establishing a new connection with the other party. An area securing means for securing a control information area, an identifier setting means for setting the address of the secured area or a part thereof as the own connection identifier, and an own connection identifier that is the other party's connection identifier in the message received from the communication partner. The apparatus is configured by having an area determining means for determining a connection control information area, and an area releasing means for releasing the connection control information area when a connection is released.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. The area securing means 1 activated by the connection establishment request 101 from the user program 8 acquires the connection control information area 5 necessary for controlling one connection from the memory pool in the system, and uses the address @ as the identifier setting means. Pass it to 2. The identifier setting means 2 is shown in FIG. 2(a).
Assemble a connection establishment request message showing the format. During this assembly, the connection control information area 5
address @ is stored in the source reference field 31, and the connection establishment request message 103 is sent to the communication partner station via the transmitter 6, and the connection establishment raw state is stored in the partner connection identifier field 51 of the connection control information area 5. Initialize it with the meaning zero.

When the area determining means 3 receives a message from the other station via the receiving unit 7, it selects the corresponding connection control information area 5 based on the contents of the destination reference field 42 in the message.
is determined, and when the other party connection identifier field 51 is zero, the message is passed to the identifier setting means 2 and activated.

When the identifier setting means 2 receives the connection establishment acceptance message 104 which is a response to the connection establishment request message 103, it stores the contents of the sender reference field 41 in the other party connection identifier field 51 and completes the connection establishment.

Note that when the identifier setting means 2 fails to establish a connection, it activates the area releasing means 4 and returns the connection control information area 5 acquired by the area securing means 1 to the memory pool. Furthermore, by preparing in advance one connection control information area 5 from the address O where the destination connection identifier field 51 is zero for receiving a connection establishment request message whose destination reference field is zero, the area determining means 3 There is no need to determine the type of received message.

On the other hand, the area release means 4 is activated by a connection release request 102 from the user program 8, assembles a connection release request message, sends it to the communication partner station via the transmitter 6, and stores the connection control information area 5 in the memory. Return it to the pool. The area release means 4 is also activated when the message receiving means 9 receives a connection release request message from a communication partner. In this case as well, the corresponding connection control information area 5 is returned to the memory pool.

The message receiving means 9 is activated by the area determining means 3 when the content of the destination reference field 42 in the received message is not zero, and performs the respective processing corresponding to the type of the received message. If so, the area release means 4 is activated, and if the message type is a data message, the data is passed to the user program 8.

Note that the address explained in this embodiment may be either an absolute address or a relative address from a certain specific address.

〔Effect of the invention〕

As explained above, in the present invention, when a connection is established, the area securing means secures the connection control information area for the connection, and the identifier setting means sets the address of the secured area as the own connection identifier. Since the connection control information area can be easily determined using the other party's connection identifier, that is, the own connection identifier, memory usage is efficient even in systems where the number of established connections varies, reducing the probability of connection establishment failure, and facilitating system regeneration. etc., is no longer necessary.

Furthermore, scanning of the connection control information area is no longer necessary, resulting in increased speed, reduced computer load, and simplified software.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2(a)
and (b) are the formats of the connection establishment request message and connection establishment acceptance message in FIG. 1, respectively. 1... Area securing means, 2... Identifier setting means, 3
... Area confirmation means, 4. Area release means, 5.
...Connection control information area, 6...Transmission section, 7
. . . receiving section, 8 . . . user program, 9 . . . message receiving means.

Claims (1)

[Claims] In a communication control device that processes a communication protocol that uniquely identifies a connection using both its own connection identifier and other party's connection identifier information, the following information is necessary to control one connection before establishing a new connection with the other party An area securing means for securing a connection control information area, an identifier setting means for setting the address of the secured area or a part thereof as the own connection identifier, and the own connection that is the other party's connection identifier in the message received from the communication partner. A connection management method comprising: area determining means for determining a connection control information area based on an identifier; and area releasing means for releasing the connection control information area when the connection is released.