JP2594313B2 - Half-duplex session management processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] In a processing system that performs data transfer using a plurality of multiplexed half-duplex sessions, the present invention relates to a half-duplex session management processing method that enables efficient data transfer. The purpose of this method is to realize the transfer processing according to the traffic generated in both systems without predefining the attributes of the half-duplex session (reception-only or transmission-only). The session management processing means that manages these half-duplex sessions with the order according to the order of establishment as attributes, and when selecting an empty session, the empty A session selection control means for searching for a session and selecting an empty session detected first; The other system is configured to select an empty session in descending order of the session establishment order.

[Industrial applications]

The present invention relates to a half-duplex session management processing method that enables efficient data transfer in a processing system that performs data transfer using a plurality of multiplexed half-duplex sessions.

[Conventional technology]

When communicating in a network system,
The logical units performing the communication are logically connected. This logical connection is a session. The point for efficiently performing data transfer using a plurality of multiplexed half-duplex sessions is to reduce the collision of transmission requests on the sessions as much as possible. If a transmission request collides on a session, the request on the non-priority station side must be rejected and retransmitted later, increasing the overhead.

Conventionally, in order to reduce the collision of transmission requests on such half-duplex sessions as much as possible, attributes dedicated to transmission or reception only are managed in each system in association with each other for each session. To control the transmission request.

[Problems to be solved by the invention]

 The above conventional method has the following problems.

(A) Attribute definition by the user is required for each session. The balance of the traffic generated in the systems at both ends differs for each user. For this reason, it is necessary for the user to define how many transmission-only sessions in the reception-only session are to be set, but it is difficult to predict the number, and the definition is cumbersome.

(B) If the balance of the call volume generated at both ends changes significantly in the time zone, there are sessions that are not used effectively, and efficient data transfer cannot be performed. For example, when there is no transmission request in the partner system and a large number of transmission requests are generated in the own system, the reception-only session is not used and the transmission request of the own system stays.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and realize a transfer process according to the traffic generated in both systems without previously defining an attribute of a half-duplex session (reception only or transmission only). And

[Means for solving the problem]

 FIG. 1 shows a configuration example of the present invention.

In FIG. 1, reference numeral 10 denotes a processing device including a CPU and a memory, 11 denotes a session management processing unit for establishing / releasing a session, and 12 denotes a session for holding the established management information of each session in order. The management queue 13 indicates a session selection control unit for selecting an empty session for transmitting a message in response to a message transmission request, and the transmission and reception control unit 14 transmits and receives data using a half-duplex session.

At the start of operation, the session management processing unit 11 establishes a predetermined number of half-duplex sessions with the partner system. At this time, all attributes of the half-duplex session to be established are input / output attributes. That is, the attributes are set so that both systems can use the session for both reception and transmission. Then, these half-duplex sessions are managed by the session management queue 12 with an order according to the order of establishment. The session management queue shown in FIG.
.. In B12 are session management blocks each having management information of each session.

When selecting a session to be used for transmission processing, the session selection control unit 13 searches for an empty session in accordance with one of predetermined ascending or descending order of the session establishment order, and selects the first detected empty session. That is, according to the order of the session management queue 12,
Find a free session and select it. Then, the selected session is notified to the transmission / reception control unit 14, and a message is transmitted using the session.

The session management queue 12
Are created in ascending and descending order of session establishment order, the other system creates session management queues 12 in descending order of session establishment order, and selects an empty session from the head of each queue. In both systems, session management queues 12 are created in ascending order of session establishment order.
When selecting an empty session, one system:
An empty session may be searched from the head of the queue, and an empty session may be searched backward from the end of the queue in the other system.

[Action]

In the present invention, the attribute of the multiplexed half-duplex session is
All attributes are input / output attributes, and the correspondence between these sessions in both systems is known. When a transmission request occurs, one system selects the associated session in ascending order, and the other system selects and transmits in descending order.

Therefore, even if the call volume generated in both systems is large on one side and small on the other side, the collision of transmission requests on the session occurs only when all other established traffic is established. Only when the session is busy. That is, the probability of occurrence of a collision is not affected by the balance of the traffic, but is affected only by the total number of established sessions and the number of mutual transmission requests. Therefore, the user only needs to define the total number of sessions established in advance, and does not need to define reception only and transmission only, and can perform efficient data transfer by effectively utilizing all sessions. Become like

〔Example〕

FIG. 2 shows an embodiment of the present invention, and FIG. 3 shows a processing explanatory diagram of an embodiment of the present invention.

In FIG. 2, reference numerals 20A and 20B denote communication systems, S
1 to Sn are the sessions used for data transfer, L1 is the link of the session management queue 12A in the system 20A, L
Reference numeral 2 denotes a link of the session management queue 12B in the system 20B, and MA1, MA2, MB1, and MB2 represent transmission request messages.

Each of the sessions S1 to Sn has an input / output attribute that allows transmission and reception in both systems. The systems 20A and 20B manage the order in which the establishment processing of these sessions S1 to Sn is completed by the session management queues 12A and 12B, taking correspondence between the two systems.

In this example, the system 20A has the link L1 of the session management queue 12A in the ascending order of the session establishment order, and the system 20B has the link L2 of the session management queue 12B in the descending order of the session establishment order.

Whether to create an ascending queue or a descending queue may be determined by comparing addresses on the network. In this way, since the addresses on the network are uniquely determined in advance, queues can be automatically created in reverse order between any systems without having to specify the order from the outside. Alternatively,
It is also possible to determine whether the order is ascending or descending depending on whether the command for establishing the session has been input or not.

In system 20A, message MA1, message MA2
Are transmitted in this order, an empty session is searched from the head of the session management queue 12A, so that the session S1 and the session S2 are allocated respectively.

On the other hand, in the system 20B, when a transmission request for the message MB1 and the message MB2 occurs, the session management queue 1
Since an empty session is searched from the beginning of 2B, session allocation is performed sequentially from the session Sn side.

FIG. 3 (a) shows the session management processing unit 11 shown in FIG.
3 shows an example of the processing. In the following description ~
Corresponds to the processing shown in FIG.

At the start of operation, session establishment processing is performed by communication with the partner system.

If the session is successfully established, the addresses of the local system and the remote system on the network are compared.

If the address of the own system is smaller than that of the partner system, the process is executed. If the address of the partner system is smaller, the process is executed.

Create session management queues in ascending order of establishment order.
In other words, the newly established session management block
Connect at the end of the queue.

If the address of the remote system is small, create a session management queue in descending order of the establishment order. That is, the management block of the newly established session is inserted at the head of the queue.

Judge whether a predetermined number of sessions have been established,
If not, control is returned to the process, and the process for establishing the next session is similarly performed. When the processing for establishing all sessions is completed, the processing is terminated.

FIG. 3 (b) shows the session selection control unit 13 shown in FIG.
3 shows an example of the processing. In the following description ~
Corresponds to the processing shown in FIG.

When there is a transmission request and an empty session is selected, first, a session management block at the top of the session management queue is pointed to.

The on / off state of the busy flag in the session management block is checked to determine whether the session is empty. If it is determined that the busy flag is on and the session is not an empty session, control is transferred to the processing.

If the busy flag is off, turn on the busy flag.

 The session is allocated for processing the transmission request.

If the currently pointed block is not an empty session, determine whether the queue has ended.

If the queue has not ended, the point is advanced to the next session management block, control is returned to the processing, and an empty session is similarly searched.

When the queue ends, the process for the transmission request is
Wait until an empty session is available.

〔The invention's effect〕

As described above, the present invention has the following effects.

(A) Since it is not necessary to define session attributes in advance, the burden on the user can be reduced. Also, tuning can be simplified by considering only the increase / decrease of the number of sessions.

(B) Flexible transfer according to the traffic of both systems is possible. For example, even in a system in which data flows only in one direction in one time zone and data flows only in the other direction in another time zone, the session can be effectively used and data can be efficiently transferred. . In addition, even if both systems have the same traffic, if a reasonable number of sessions (total traffic generated per unit time in both systems) is prepared, transmission can be performed with almost no collision of transmission requests. is there.

[Brief description of the drawings]

FIG. 1 shows a configuration example of the present invention, FIG. 2 shows an embodiment of the present invention, and FIG. 3 shows a processing explanatory diagram of an embodiment of the present invention. In the figure, 10 is a processing device, 11 is a session management processing unit, 12 is a session management queue, 13 is a session selection control unit, and 14 is a transmission / reception control unit.

Claims (1)

(57) [Claims] In a processing system for transferring data using a plurality of multiplexed half-duplex sessions, an attribute of a half-duplex session established in advance is set as an input / output attribute, and these half-duplex sessions are Session management processing means (11) for managing with the order according to the establishment order
In selecting an empty session for transmission processing, a session selection control means (13) that searches for an empty session in accordance with one of a predetermined order of ascending or descending order of session establishment and selects an empty session detected first. A half-duplex session management processing method characterized in that one of the transmitting and receiving systems selects an empty session in ascending order of the session establishment order and the other system selects an empty session in descending order of the session establishment order.