JPH08204750A - Data transfer control system - Google Patents

Abstract

PURPOSE: To attain efficient transfer control in response to a traffic by allocating a logic channel having been allocated to a transmitter with lower priority to a transmitter with higher priority when a data transfer traffic is increased by the transmitter with higher data transfer priority in the two transmitters. CONSTITUTION: When a terminal processing unit 10 transfers data to two terminal processing units 11, 12, a logic channel is used for the unit 11 at first to transfer data to the unit 11 and four logic channels are used to transfer data to the unit 12. In this case, the processing unit 10 detects a data transfer traffic and when the priority of an application program(AP) to transfer data to the unit 11 is higher, the allocation of number of logic channels in use is revised such that three logic channels are used for the unit 11 and two logic channel are used for the unit 12. Thus, the data are transferred efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer control system, and more particularly to X. 25 (hereinafter, X.
25)) to avoid congestion when transferring packet data.

[0002]

2. Description of the Related Art In general, X. When the packet data of 25 is transferred, the data transfer destination station DTE (Da
The own terminal device prepared in advance the required number of logical channels according to the number of ta Terminal Equipments. Then, a one-to-many communication is performed by using a logical channel required in response to a communication request for each partner station DTE.

However, in the above-mentioned conventional transfer control system, since the data transfer path of the logical channel between the own DTE and the partner DTE is one-to-one, the data transfer adapted to the change in the data transfer amount is performed. I can't do it. Therefore, a decrease in data transfer processing capacity is likely to occur due to an increase in traffic of the data transfer amount.

Therefore, various systems have been devised which perform transfer control according to the amount of traffic.

First, there is an apparatus disclosed in Japanese Patent Application Laid-Open No. 2-25130. This is because the mode is switched based on the detection result of the amount of data in data transmission / reception, more channels are assigned to the terminal device with a large amount of transmission and transfer, and relatively relatively to the terminal device with a small amount of transmission and transfer. It allocates a small number of channels.

There is also an apparatus disclosed in Japanese Patent Laid-Open No. 179040/1990. This changes the amount of transmission information per channel transmitted per unit time.

Further, there is a system disclosed in Japanese Patent Laid-Open No. 63-19931. This is to increase or decrease the number of channels in each channel block and change the allocation channel position of each in-communication call.

According to the techniques disclosed in the above publications, channel allocation can be changed.

[0009]

However, according to the above-mentioned respective publications, although the logical channels can be uniformly used according to the traffic volume, one-to-one, one-to-many, and many-to-many communication is possible. It is not possible to perform efficient transfer control in each case, and it has been expected to realize a data transfer control system that can perform more efficient transfer control.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object thereof is to provide a data transfer control system capable of performing more efficient transfer control according to the traffic amount. Is.

[0011]

A data transfer control system according to the present invention provides first to nth (n is an integer of 3 or more) for first and second transmitting devices which transfer data to another device.
A data transfer control system for allocating the logical channel of the first and second transmission devices, the device having the lower priority when the data transfer traffic by the device having the higher data transfer priority is increasing. It is characterized by including control means for allocating the logical channel assigned to the device to the device with the higher priority.

[0012]

When the data transfer traffic by the device having the higher data transfer priority of the first and second transmitting devices is increasing, the logical channel assigned to the device having the lower priority is set to the priority level. Assign to higher device.

[0013]

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

FIG. 1 is a block diagram showing the operation of an embodiment of a data transfer control system according to the present invention. FIG. 1 (a) is before changing the number of logical channels to be used, and FIG. 1 (b).
Shows the network configuration after the change.

The data transfer control system according to the present invention comprises:
The feature is that the number of logical channels to be used is changed according to the priority of a device or an application program (hereinafter, abbreviated as AP) that performs data transfer. That is, when the data transfer traffic by the device having the higher data transfer priority among the transmitting devices is increasing, the logical channel assigned to the device having the lower priority is allocated to the device having the higher priority. is there. The AP also includes a user program.

Specifically, it is carried out as follows.

When the terminal processing device 10 transfers data to the two terminal processing devices 11 and 12 as shown in FIG. Transfer data using one channel,
Data is transferred to the terminal processing unit 12 using four logical channels. In this case, the AP that transfers data to the terminal processing device 11 has a higher priority than the AP that transfers data to the terminal processing device 12.

In such a case, if the traffic volume of data transfer to both devices increases, the number of logical channels used is changed in order to perform data transfer more efficiently. In this example, since the AP that transfers data to the terminal processing device 11 has a higher priority, three logical channels are assigned to the terminal processing device 11 as shown in FIG. The number of used logical channels is changed so that the terminal processor 12 uses two logical channels.

Due to this change, the traffic amount of data transfer to the terminal processing device 12 remains large,
The traffic volume of data transfer to the terminal processing device 11 becomes small. As a result, data transfer can be performed more efficiently.

However, at least one logical channel is secured even if the traffic volume is small. Therefore, assuming that three or more logical channels are provided, when the data transfer traffic by the device with the higher data transfer priority of the two transmitters is increasing, the device with the lower priority is selected. A part (1 channel or more) of the allocated logical channels is allocated to the device having the higher priority.

A configuration for realizing the above operation will be described with reference to FIGS.

FIG. 2 is a block diagram showing the configuration of an embodiment of the data transfer control system according to the present invention. In the figure, a data transfer control system according to an embodiment of the present invention is shown in FIG. X.25 between the plurality of partner DTEs 5-1 to 5-3 via the switching network 4 having the control mechanism of H.25. It is configured to include a terminal processing device 1 that performs data transfer under 25 control.

The partner DTEs 5-1 to 5-3 are not limited to the terminal processing devices, but may be host systems.

The terminal processing device 1 operates inside the terminal A.
P2-1 to 2-n and the communication control mechanism 3 are included. The communication control mechanism 3 uses the X. X.25 control function. 25 (network) control unit 6 and call control management unit 7 that sequentially manages the usage status of logical channels.
And a data control management unit 8 having a function of monitoring data traffic and data processing priority from each AP.

In order to effectively use the logical channels defined in the terminal processing device 1, the call control management unit 7 first connects the channels from one logical channel, and when the connection is completed, the AP to the data control management unit 8 Notify to which party DTE the call connection was made. The data control management unit 8 creates the data control management table shown in FIG. 3 based on the information notified from the call control management unit 7. Details of the contents of the data control management table will be described later.

The number of logical channels is increased / decreased on the basis of an instruction notification from the data control management unit 8 indicating an increase / decrease in traffic volume. In this case, X. 25
At least one logical channel is reserved for the channel to which the call connection is made.

When the call disconnection processing notification is issued from the AP, the data control management unit 8 notifies the call control management unit 7 of the partner DTE used by the disconnected AP and the number of logical channels. As a result, the call control management unit 7 requests the logical channel disconnection process. The released logical channel is secured by the call control management unit 7 as an empty logical channel.

Further, the logical channel number increase / decrease information with each other DTE is as shown in the sequence diagram of FIG. 7, and the call control management unit 7 divides the logical channel increase / decrease confirmation information as shown in FIG. It is notified in advance by an interrupt packet, and when the interrupt confirmation is returned, it is judged as normal confirmation and the number of logical channels is increased or decreased. The details of the contents of FIG. 7 will be described later.

In FIG. 4, the interrupt packet in this embodiment is 8-bit packet data, the most significant bit x of which is channel transition information, and when it is "0", the number of channels decreases and when it is "1". When the number of channels increases. Also, the lower 4 bits y1 to y of the packet data
Reference numeral 4 denotes a priority, and the priorities 0 to 15 are represented by a binary number. When the priority is “0”, the priority is low, and when the priority is “15”, the priority is high.

This interrupt packet is transferred by the following operation. That is, the data control management unit 8 notifies the interrupt packet control unit 72 of the call control management unit 7 of the data control management table created by collecting information for each AP, and the interrupt packet control unit 72 sends the interrupt data information. The interrupt packet is issued using the logical channel that is created and is already connected in AP units. Note that this control is not executed because the first active logical channel cannot issue an interrupt packet.

Furthermore, when all the logical channels are in use, as shown in FIG. 1, the logical channel to be used is shifted to a higher priority according to the priority of the AP, and data communication is possible. And The priority is also confirmed in the interrupt packet for the partner DTE that increases the logical channel and the DTE that decreases the logical channel.

The data control management unit 8 distributes and collects the order of transmitted / received data when data is transmitted / received on a plurality of logical channels in AP units, manages accumulated data in increasing the traffic amount in each AP unit, and calls control management unit 7 It has a function to instruct to increase or decrease the logical channels. The number of logical channels and the staying data information for each AP are sequentially managed using the data control management table shown in FIG.

As shown in FIG. 3, the data control management table is composed of five items, AP division, partner DTE number, number of channels, traffic rate, and priority.

The AP classification is X. This is an item that is registered and added to this table when the AP notifies the data management control unit of the 25 packet connection request. Further, the registration is deleted from this table when the AP notifies the packet line disconnection request due to the end of the data transfer.

The partner DTE number is used to determine which partner each AP is connected to. Same A
It is set as a countermeasure when connecting to a plurality of partner DTEs at P.

The number of channels is an item for managing how many logical channels are currently reserved and used by 1 AP and 1 partner DTE. This item is deleted when the number of logical channels reaches zero.

The traffic rate is an item calculated by the data control management section 8 by grasping which logical channel data has been transferred within a fixed time.

The priority is an item determined by the AP's own control based on the business content of the AP transmitted by the interrupt data. Unless otherwise specified, the priority is set as the lowest value, and due to traffic increase / decrease, negotiation with the partner DTE (nego
Tation).

Here, the internal configuration of the data control management unit 8 will be described with reference to FIG. As shown in the figure, the data control management unit 8 is configured to include a data buffer management control unit 81 that controls the transmission / reception data of the AP.

The data buffer management control unit 81 uses the data control management table to perform data control and data management of the packet data buffer, and to monitor the load state of packet data via the logical channel management unit 82. 83 is sequentially notified.

Further, the data buffer management control unit 81 includes a logical channel management unit 82 for allocating the number of logical channels within the controllable range of the terminal processing device according to the activation state of each AP. In this case, the activation state of the AP is recognized by sequentially notifying the connection state of the call control management unit 7, and the number of logical channels to be allocated is secured.

Furthermore, the data buffer management controller 8
1 is X. It is configured to include a traffic monitoring control unit 83 that transmits and receives data based on 25 data flow control. Based on the logical channel secured by the logical channel management unit 82, the traffic monitoring control unit 83 determines / controls how much load is applied to the data flow control, and the traffic volume increase / decrease information is added to the logical channel. The management unit 82 and the data buffer control management unit 81 are notified and the increase / decrease of logical channels is determined.

A method of detecting the traffic volume in the data control management unit 8 will be described.

The detection of the traffic volume is performed by the X. Twenty-five data flow control determines the window size according to the number of logical channels used in one AP and the ratio of the priority.

If there is a free logical channel, X. 25
When data equivalent to the window size value is accumulated in the control unit 6, it is determined that the traffic state has a high load, and the number of logical channels is increased.

Here, the "window size" means the X. 25 Control unit and partner device X. 25 is the number of packets that can be continuously transmitted in the packet data transfer with the control unit (including the exchange) without waiting for the delivery confirmation from the partner device side.

If the window size is "4", for example, and if the continuous data is 4 packets, continuous transmission can be performed without waiting for delivery confirmation.

Further, assuming that the continuous data is 6 packets, after the continuous transmission of 4 packets, the remaining 2 packets are transmitted after waiting for the delivery confirmation from the partner control. In this case, 2 packets are retained.

Furthermore, assuming that the continuous data is 8 packets or more, after the continuous transmission of 4 packets, the staying packet becomes 4 packets or more which is the same as the window size. Therefore, one additional logical channel should be used. become.

Since the traffic becomes zero when the AP ends online, the logical channel used is set to zero.

In the case where all logical channels are active (in use), the detection of the traffic volume of the logical channel held by the AP with the low priority is made equal to or larger than the window size when the traffic with the AP with the high priority occurs. The logical channels are opened in order from the one less than the traffic amount. The released channel is used for AP with high priority.

When the number of accumulated packets becomes zero, the logical multiplexing is reduced by one logical channel, and unnecessary logical channels are left empty.

Regarding the logical channel activation request first issued from the AP, at least one logical channel is secured regardless of the priority.

The specific traffic volume calculation method is as follows.

X. 25 When the number of transmission packets notified to the control unit 6 becomes more than twice the window size, it is determined that the traffic amount is in a high load state. In this case, it is necessary to increase the logical channels. Also,
X. 25 When the number of transmission packets staying in the control unit 6 becomes equal to or larger than the window size, it is determined that the traffic amount is in a high load state. Also in this case, it is necessary to increase the logical channels.

On the other hand, X. 25 When the number of transmission packets staying in the control unit 6 becomes zero, it is determined that the traffic amount is in a low load state. At this time, when a plurality of logical channels are used in AP units, the logical channels are reduced one by one.

As described above, the traffic volume is detected, and the logical channel is assigned according to the detection result.

Next, the internal structure of the call control manager 7 will be described with reference to FIG. As shown in the figure, the call control management unit 7 performs X.X. which performs call connection (call request instruction and incoming call notification determination) as the logical channel increase / decrease process instructed by the data control management unit 8. It is configured to include a 25 call control unit 71.

This X. The 25 call control unit 71 notifies the interrupt packet control unit 72 of the instruction from the data control management unit 8 and performs matching with the partner DTE system. The control unit 71 also controls the logical channel division and assembly per 1DTE as the logical channels are increased or decreased.

Further, as shown in the figure, the call control management unit 7 manages the logical channel with the partner DTE based on the data control management table information created and notified by the data control management unit 8. In order to notify the partner DTE in advance of increase / decrease of the logical channels based on the priority of, the interrupt packet control unit 72 is configured to issue an interrupt packet to the already connected logical channels.

The interrupt packet issued by the interrupt packet control unit 72 is created based on the interrupt data information and the data control management table. 25. An interrupt data issue request is issued to the call control unit 71.

Next, the operation of the data transfer control system having the above configuration will be described with reference to the sequence diagram of FIG.

In the figure, AP2-1 and 2-2 are X. 25 through the control unit 6 and the switching network 4
The operation sequence when transferring data to 1 is shown.

First, when the AP 2-1 sends a call request to the DTE 5-1, the incoming call is notified to the partner DTE 5-1 by the logical channel 1 (). In response to this notification, an incoming call confirmation is sent from the partner DTE 5-1 and the AP 2-1 is notified that the calling has been completed (). After performing the above operation, the AP 2-1 starts the data transfer, and the logical channel 1 performs the data transfer process ().

While performing this data transfer process, A
When P2-2 sends a call request to DTE5-1, the same DTE is already being connected.
The call completion is notified to AP2-2 (). As a result, the AP 2-2 starts data transfer, and the data transfer process using the logical channel 1 is performed ().

However, in this case, since the traffic of AP2-2 increases and the retention of the transmission data occurs, the interrupt data information is issued to increase the number of channels,
The confirmation is made ().

As described above, the incoming call is notified to the partner DTE 5-1 by the new logical channel 2, and the data transfer process using the logical channel 2 in addition to the logical channel 1 is performed ().

After that, when the traffic of AP2-2 decreases and the retention of transmission data disappears, interrupt data information is issued to reduce the number of channels, and the confirmation is performed (). As a result, the disconnection is notified to the partner DTE 5-1 by the logical channel 2 and the logical channel 2 is disconnected ().

As described above, in the present data transfer control system, the number of logical channels is limited by effectively utilizing the logical channels for connecting with a plurality of partner DTEs according to the priority of the AP. Can be used more efficiently.

Further, by clearly indicating the online load status due to the traffic volume to the user through the AP, the user can grasp the online status and performance.

Further, by using the interrupt packet and performing channel control while confirming with the partner system, more efficient communication in many-to-many online transfer becomes possible. In this case, the partner system may be configured to reject the increase or decrease of the logical channels, if necessary.

[0072]

As described above, according to the present invention, more efficient transfer control is performed by effectively utilizing the logical channels when connecting to a plurality of partner DTEs according to the priority of the AP. It has the effect of being able to

[Brief description of drawings]

FIG. 1 is a block diagram showing an operation of a data transfer control system according to an embodiment of the present invention, in which (a) shows a network configuration before changing the number of logical channels and (b) shows a network configuration after changing.

FIG. 2 is a block diagram showing a configuration of a data transfer control system according to an embodiment of the present invention.

FIG. 3 is a diagram showing contents of a management table in a data control management unit.

FIG. 4 is a diagram showing the contents of interrupt data information.

FIG. 5 is a block diagram showing a configuration of a data control management unit.

FIG. 6 is a block diagram showing a configuration of a call control management unit.

FIG. 7 is a sequence diagram showing data transfer control by the data transfer control system according to the embodiment of the present invention.

[Explanation of symbols]

 1, 10, 11, 12 Terminal processing device 2-1 to 2-n Application program 4 X. 25 control switching network 5-1 to 5-3 partner DTE 6 X. 25 control unit 7 call control management unit 8 data control management unit

Claims (3)

[Claims] 1. A first and second device for transferring data to another device
A first to n-th (n is an integer of 3 or more) logical channel is allocated to the first transmitting device, and the one having the highest data transfer priority among the first and second transmitting devices. Control means for allocating a part of the logical channel allocated to the device having the lower priority to the device having the higher priority when the data transfer traffic by the device is increasing. Data transfer control system. 2. The traffic amount detecting means for detecting a data transfer traffic amount by the first and second transmitting devices, and the first means according to the detection result.
2. The data transfer control system according to claim 1, further comprising: a logical channel allocating means for allocating a logical channel to the first and second transmitting devices. 3. The data is packet data, and the traffic amount detecting means detects the traffic amount based on a window size which is the maximum number of packets that can be continuously transmitted without confirming the packet data with the transmission partner. The data transfer control system according to claim 2, which is characterized in that.