JPH08204748A - Throughput control system for packet communication - Google Patents

Abstract

PURPOSE: To secure communication speed of communication of a specific terminal adaptor with priority even when traffic of packet communication is in congestion in D channel and B channel packet communication using an ISDN channel. CONSTITUTION: A packet monitor adaptor 1 calculates a communication throughput to be added and has a call reference number list used at present and a communication throughput to be added as user information and generates a release end message having a call reference number to be used at present and sends it. Terminal adaptors 61 -68 detect a release end message to decrease a throughput of a transmission packet more as the priority stored in advance, is lower when the communication throughput to be added is less than a lower limit border and to increase a throughput of a transmission packet more as the priority stored in advance is higher when the communication throughput to be added is more than an upper limit border.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throughput control method in packet communication, and more particularly to a throughput control method for controlling the number of packets per unit time in D channel and B channel packet communication using an ISDN line.

[0002]

2. Description of the Related Art Conventionally, in packet communication, the number of packets per unit time, that is, the throughput has been conventionally controlled (Japanese Patent Laid-Open No. 63-38345). That is, this one sets an assumed throughput when the calling subscriber sends a call request packet to the exchange, and the exchange constantly scans the throughput of the trunk line periodically to grasp the surplus capacity and at the same time measure it. Calculates the rate of change of throughput and presets when call setup is requested.
Alternatively, the surplus capacity value at the next cycle time is estimated for each candidate line based on the state probability transition matrix that is periodically updated, the surplus capacity value grasped by the subscriber, and the change rate of the measured throughput. , Whether the call can be accepted,
By routing the output path, it is intended to efficiently use the relay line, that is, to improve the packet transfer efficiency.

[0003]

However, in the above-mentioned conventional throughput control system, the integrated service digital network (ISDN) is integrated.
s Digital Network) D using a line
When terminal adapters are connected at multiple points in packet communication of channels and B channels, and when the traffic condition of packet communication is congested, regardless of the importance of any terminal under the bus wiring, the same applies. Since the communication speed has decreased, the desired throughput may not always be achieved even if the communication content is to be prioritized.

[0004] The present invention has been made in view of the above points,
An object of the present invention is to provide a throughput control method in packet communication that can prioritize communication in a specific terminal adapter even if the traffic condition of packet communication is congested.

[0005]

In order to achieve the above object, the present invention provides a system in which a plurality of terminal adapters are connected to a common bus and a packet monitoring adapter is connected between the common bus and a network. A throughput control method in packet communication, in which a packet monitoring adapter
A calculation unit that calculates the communication throughput value that can be added by subtracting the current throughput value obtained by constantly monitoring transmitted packets from the maximum communication speed of the system, and a list of call reference numbers currently in use The terminal adapter has a communication throughput value as user information, and a release completion message creating means for creating and transmitting a release completion message having a call reference number that is not currently used. Message detection means for detecting the release completion message from the call reference number, and a priority storage unit in which priorities are stored in advance,
When the communication throughput value that can be added in the release completion message detected by the message detection means becomes less than the lower limit boundary value, the lower the priority, the lower the throughput of the transmission packet becomes, and when it becomes larger than the upper limit boundary value, The communication speed control means increases the throughput of outgoing packets as the priority is higher.

[0006]

In the present invention, the packet transmitted by the packet monitoring adapter is constantly monitored, the communication throughput value that can be added is calculated from the current throughput value, and this is notified to the terminal adapter as a release completion message. Since the throughput of the outgoing packet is controlled by the communication speed control means according to the priority order stored in the priority order storage unit in advance, the communication speed control according to the traffic situation of the packet communication and according to the priority order. You can

[0007]

Next, an embodiment of the present invention will be described. FIG. 1 shows a system configuration diagram of an embodiment of the present invention. In the figure, the packet monitoring adapter 1 is an ISDN user / user.
A subscriber line terminating device (DSU: Digital Service) is provided via the S / T point 2 on the network side of the network interface.
Unit) 3 while S / T point 4 on the user side
Is connected to the common bus 5 via. Eight terminal adapters 6 _{1 to} 6 ₈ are separately provided on the common bus 5 to provide data terminal equipment (DTE: DataTermin).
al Equipment) 7 _{1 to} 7 ₈ .

The DSU 3 is a device for terminating a digital subscriber line, and has electrical connection functions such as establishment of line synchronization and power supply. DTE7 ₁ ~7 ₈ in the existing terminal, the terminal adapter ₆₁ through ₈ performs protocol conversion between the ISDN user-network interface with existing protocols.

The packet monitoring adapter 1 constantly monitors all the packet data passing through the D channel and the B channel, detects the packet traffic condition, calculates the addable throughput value, and calculates the calculated addable throughput value. Notify each terminal adapter 6 _{1 to} 6 ₈ connected to the common bus 5.

This packet monitoring adapter 1 is, as shown in FIG. 2, an ISDN control unit 1 connected to an S / T point 2.
1, a throughput calculation unit 12, a call reference number table 13, a release completion message creation unit 14, and an ISDN control unit 15 connected to the S / T point 4. The throughput calculation unit 12 calculates a throughput value that can be added.

Next, the operation of the packet monitoring adapter 1 will be described. A packet input from the network side via the S / T point 2 is sent to the call reference number table 1 via the ISDN control unit 11 and the throughput calculation unit 12.
3 is input to the release completion message creating unit 14.

Now, assuming that the packet data length passing through the D and B channels per second is L bytes, IS
The packet control status is L × by the DN control unit 11.
8 (bps) is detected. Letting T be the traffic condition of L × 8 (bps), the throughput calculation unit 12
The maximum achievable throughput value of the D channel is 160
Since it is 00 bps, the throughput value that can be added is calculated as 16000-T (bps).

Meanwhile, call reference number table 13 in advance all stored call reference numbers are used in the communication of DTE7 ₁ ~7 _8. The release completion message creating unit 14 receives the addable throughput value calculated by the throughput calculating unit 12 and the call reference number from the call reference number table 13 as input signals,
The throughput value and the list of call reference numbers are written in the user / user information section, and a release completion message in which a call reference number not currently used is added to the user / user information section is created. The created release completion message is reprocessed into a packet together with the data of the received packet, and the ISDN control unit 1
5 and the common bus 5, respectively, to the terminal adapters 6 _{1 to} 6 ₈ .

The terminal adapters 6 _{1 to} 6 ₈ have the same structure. For example, as shown by 6 in FIG. 3, an ISDN control unit 21, a message check unit 22, a call reference number table 23, a call reference number comparison unit 24, and an addable unit. Throughput value check unit 25,
Communication speed up / down instruction unit 26, priority storage unit 2
7, a timer 28, a communication speed control unit 29, a communication speed storage unit 30, and a host interface control unit 31.

Next, the operation of the terminal adapter 6 will be described. First, the packet transmitted from the packet monitoring adapter 1 to the terminal adapter 6 is ISD.
The message check unit 22 receives the message via the N control unit 21, and the message check unit 22 checks whether or not the received packet is a release completion message based on the message identifier (ID).

When the message check unit 22 determines that the received message is the release completion message, it passes the release completion message to the call reference number comparison unit 24, and if it is not the release completion message, the received message is sent to the upper interface control unit 31. Hand over to.

Call reference number comparison unit 24
Calls the call reference number in the released release complete message into the call reference number table 23.
The release completion message passed is compared with the call reference number stored in (1), and if there is a matching call reference number, the released release completion message is an existing release completion message and is passed to the upper interface control unit 31 as it is.

On the other hand, if the call reference number in the passed release completion message is not among the call reference numbers stored in the call reference number table 23, the call reference number comparison unit 24 determines the passed release completion message. The call reference number list written in the user / user information section is overwritten on the call reference number table 23, and the addable throughput value in the release completion message is passed to the addable throughput value checking section 25.

The addable throughput value checking unit 25 checks whether the input addable throughput value is less than the lower limit boundary value or greater than the upper limit boundary value, and is less than the lower limit boundary value. When it is detected, the communication speed up / down instruction unit 26 is set to communication speed down, and when it is detected that the value exceeds the upper limit boundary value, the communication speed up / down instruction unit 26 is set to communication speed up.

The priority stored in the priority storage unit 27 in advance and the communication speed up / down instruction unit 2
The timer value of the timer 28 is set based on the communication speed set to 6. As for this timer value setting condition, the timer value is set longer for the DTE that is prioritized when the communication speed is set lower, and the timer value is set shorter for the DTE that is prioritized when the communication speed is set higher.

That is, when the traffic conditions of the packet communication of the D channel and the B channel are congested, the communication speed is lowered from the DTE having the lower priority, the congestion of the traffic condition of the packet communication is eliminated, and the throughput that can be added is increased. When the value increases, D with higher priority
This means increasing the communication speed from TE.

When the timer 28 times out, the communication speed control unit 29 compares the communication speed from the communication speed storage unit 30 storing the desired communication speed with the current communication speed, and the current communication speed is determined. When the communication speed is higher than the desired communication speed, the communication speed is reduced, and when the current communication speed is lower than the desired communication speed, the communication speed is increased. The message whose communication speed is controlled in this way is taken out from the upper interface control unit 31 and further output to the corresponding DTE via a processing unit (not shown).

As described above, according to this embodiment, the throughput control according to the priority order stored in the priority order storage unit 27 can be performed. The storage priority of the priority storage unit 27 can be set to a desired priority by the corresponding DTE connected. After the communication speed changing operation of the communication speed control unit 29, the stored contents of the communication speed storage unit 30 are updated to the changed communication speed.

[0024]

As described above, according to the present invention,
The packets transmitted by the packet monitoring adapter are constantly monitored, the communication throughput value that can be added is calculated from the current throughput value, and this is notified to the terminal adapter as a release completion message, and the terminal adapter stores it in the priority storage unit in advance. By controlling the throughput of the outgoing packet by the communication speed control means according to the priority order, it is possible to control the communication speed according to the traffic status of the packet communication and according to the priority order. Even when there is a multi-point connection, it is possible to prioritize communication in a specific terminal adapter among a plurality of terminal adapters connected, and it is possible to communicate a packet of communication content to be prioritized with a target throughput as much as possible.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a packet monitoring adapter.

FIG. 3 is a configuration diagram of an embodiment of a terminal adapter.

[Explanation of symbols]

1 Packet Monitor Adapter 2, 4 S / T Point 3 Subscriber Line Termination Unit (DSU) 5 Common Bus 6, 6 _{1 to} 6 ₈ Terminal Adapter 7 _{1 to} 7 ₈ Data Terminal Equipment (DTE) 12 Throughput Calculation Unit 13, 23 Call reference number table 14 Release completion message creation unit 22 Message check unit 24 Call reference number comparison unit 25 Addable throughput value check unit 26 Communication speed up / down instruction unit 27 Priority storage unit 28 Timer 29 Communication speed control unit 30 Communication speed Storage unit 31 Upper interface control unit

Claims (2)

[Claims] 1. A throughput control method in packet communication of a system in which a plurality of terminal adapters are connected to a common bus, and a packet monitoring adapter is connected between the common bus and a network. Is a calculation unit that calculates a communication throughput value that can be added by subtracting the current throughput value obtained by constantly monitoring packets transmitted by the system from the maximum communication speed of the system, and a call reference currently used. It has a list of numbers and the communication throughput value that can be added as user information, and has a release completion message creating means for creating and transmitting a release completion message having a call reference number that is not currently used. , The terminal adapter is configured to receive the call A message detecting unit that detects the release completion message from the release number, a priority storage unit in which priorities are stored in advance, and an addable communication throughput value in the release completion message detected by the message detection unit. Communication speed control means for lowering the throughput of outgoing packets when the priority is lower than the lower limit, and increasing throughput of the outgoing packets when the priority is higher than the lower limit. A method for controlling throughput in packet communication, which comprises: 2. The packet monitoring adapter is connected between the S / T point of the integrated service digital network and the S / T point of the common bus, and the release completion message is transmitted on the D channel and the B channel. The throughput control method in packet communication according to claim 1, wherein: