JP2768288B2 - Throughput control method in packet communication - Google Patents

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 is controlled (JP-A-63-38345). That is, when the calling subscriber sends a call request packet to the exchange, the expected throughput is set, and the exchange constantly scans the throughput of the trunk line periodically to grasp the surplus capacity and simultaneously measure the surplus capacity. Calculate the rate of change of throughput, set in advance when requesting call setup,
Alternatively, the surplus capacity value at the next cycle is estimated for each candidate line based on the state probability transition matrix that is periodically updated, the surplus capacity value that is known as the set value from the subscriber, and the change rate of the measured throughput. Whether to accept calls,
The purpose of the present invention is to increase the efficiency of use of a trunk line, that is, the efficiency of packet transfer, by performing routing of an output path.

[0003]

However, in the above-described conventional throughput control method, an integrated service digital network (ISDN: Integrated Service) is used.
s Digital Network)
In the packet communication of the channel and the B channel, when the terminal adapter is connected at the multipoint, and when the traffic situation of the packet communication is congested, any terminal under the bus wiring is similarly regardless of its importance. Since the communication speed has been reduced, the intended throughput cannot always be achieved even with the communication contents that the user wants to give priority to.

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

[0005]

According to the present invention, there is provided 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, wherein a packet monitoring adapter comprises:
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 list of currently used call reference numbers. The terminal adapter has a communication throughput value that can be added as user user information, and a release completion message creating means for creating and sending a release complete message having a call reference number that is not currently used. A message detection means for detecting whether the received message is a release completion message, a priority storage unit in which priorities are stored in advance, and a table indicating the currently used call reference number,
When the message detection means detects that the received message is a release completion message, a comparison means for comparing whether or not a list of call reference numbers in the detected release completion message exists in the call reference numbers in the table Only when the comparison means obtains a comparison result in which the call reference number list does not exist in the call reference numbers in the table, the lower the priority when the additional communication throughput value is less than the lower limit, the lower the priority. A communication speed control means for lowering the packet throughput and increasing the priority of the packet when it becomes larger than the upper limit value increases the throughput of the transmission packet.

[0006]

According to the present invention, a packet transmitted by the packet monitoring adapter is constantly monitored, a communication throughput value that can be added is calculated from the current throughput value, and the calculated communication throughput value 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 priorities stored in the priority storage unit in advance, the communication speed control according to the traffic situation of the packet communication and according to the priorities. Can be.

[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, a packet monitoring adapter 1 is a user of ISDN.
A subscriber line termination unit (DSU: Digital Service) is provided via the S / T point 2 on the network side of the network interface.
S / T point 4 on the user side while being connected to
And is connected to the common bus 5 via. Common bus 5 the data terminal equipment via separate respective eight terminal adapter ₆₁ through ₈ in (DTE: DataTermin
are connected to al Equipment) 7 ₁ ~7 _8.

The DSU 3 is a device for terminating a digital subscriber line and has an electrical connection function 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 packet data passing through the D channel and the B channel, detects a packet traffic situation, calculates an addable throughput value, and calculates the addable throughput value. It is connected to a common bus 5 notifies each terminal adapter ₆₁ through _8.

As shown in FIG. 2, the packet monitoring adapter 1 is an ISDN control unit 1 connected to the 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 calculator 12 calculates an addable throughput value.

Next, the operation of the packet monitoring adapter 1 will be described. The packet input from the network side via the S / T point 2 is transmitted 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.

Assuming that the length of packet data passing through the D channel and the B channel per second is L bytes, IS
The packet traffic status is L × by the DN control unit 11.
8 (bps) is detected. Assuming that the traffic condition of L × 8 (bps) is T, the throughput calculation unit 12
Means that 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 creation unit 14 receives, as input signals, the addable throughput value calculated by the above-described throughput calculation unit 12 and the call reference number from the call reference number table 13,
These throughput values and the list of call reference numbers are written in the user / user information section, and a release completion message is created by adding a call reference number that is not currently used to the user / user information section. 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 a common bus 5 are respectively supplied to the terminal adapter ₆₁ through ₈ via respectively.

The terminal adapters 6 _{1 to} 6 ₈ have the same configuration. 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 can be added. Throughput value checking 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 higher-level interface control unit 31.

Next, the operation of the terminal adapter 6 will be described. First, a packet transmitted from the packet monitoring adapter 1 to the terminal adapter 6 is an ISD
The message is received by the message check unit 22 via the N control unit 21, and the message check unit 22 checks whether 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 a release completion message, the message check unit 22 passes the release completion message to the call reference number comparing unit 24. Pass to

The call reference number comparing section 24
Compares the list of call reference numbers in the passed release completion message with the call reference numbers stored in the call reference number table 23, and if there is a matching call reference number, the passed release completion message indicates the existing release. Since it is a completion message, it is passed to the upper interface control unit 31 as it is.

On the other hand, if the call reference number list in the passed release completion message does not exist in the call reference numbers stored in the call reference number table 23, the call completion number Common bus
All connected to the terminal adapter 6 _{1-6 8} to 5
Irrelevant release complete message and communication will continue
In a further override the call reference number list written in the user-user information of the passed release complete message to the call reference number table 23
New and and pass additional possible throughput values in the release complete message to add possible throughput value checking section 25.

The addable throughput value check unit 25 checks whether the input addable throughput value has become smaller than the lower boundary value or larger than the upper boundary value. Is detected, the communication speed down is set in the communication speed up / down instructing section 26, and when it is detected that the communication speed is larger than the upper limit value, the communication speed up is set in the communication speed up / down instructing section 26.

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

That is, when the traffic situation of the packet communication of the D channel and the B channel becomes congested, the communication speed is reduced from the DTE having the lower priority, the congestion of the traffic situation of the packet communication is eliminated, and the throughput which can be added is increased. When the value increases, the higher priority D
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. When the communication speed is higher than the desired communication speed, the communication speed is reduced. When the current communication speed is lower than the desired communication speed, the communication speed is increased. The message whose communication speed has been controlled in this way is extracted 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, it is possible to control the throughput in accordance with the priority stored in the priority storage unit 27. The storage priority of the priority storage unit 27 can be set to a desired priority by the DTE connected to the storage. Further, after the communication speed changing operation of the communication speed control unit 29, the content stored in the communication speed storage unit 30 is updated to the changed communication speed.

[0024]

As described above, according to the present invention,
A packet transmitted by the packet monitoring adapter is constantly monitored, a communication throughput value that can be added is calculated from the current throughput value, and the calculated communication throughput value is notified to the terminal adapter as a release completion message. By controlling the throughput of outgoing packets by the communication speed control means according to the priorities set, the communication speed can be controlled according to the traffic conditions of the packet communication and according to the priorities. When there is, communication at a specific terminal adapter among a plurality of terminal adapters connected at a multipoint can be prioritized, and a packet of communication contents to be prioritized can be communicated with a target throughput as much as possible.

[Brief description of the 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]

Reference Signs List 1 packet monitoring 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 unit (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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04L 12/56 H04L 12/02 H04L 12/28

Claims (2)

(57) [Claims] 1. A throughput control method for packet communication in 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, the packet monitoring adapter comprising: An arithmetic unit for calculating a communication throughput value that can be added by subtracting a current throughput value obtained by constantly monitoring packets transmitted by the system from a maximum communication speed of the system, and a call reference currently used. A release completion message creating unit that has a number list and the addable communication throughput value as user user information, and that creates and sends a release completion message having a call reference number that is not currently used. The terminal adapter sends the received message to the release completion message. Message detecting means for detecting whether or not the message is a message, a priority storing section in which priorities are stored in advance, a table indicating a call reference number currently in use, and the message detecting means releasing the received message. When a completion message is detected,
Comparing means for comparing whether the list of call reference numbers in the detected release completion message is present in the call reference numbers in the table, and comparing the call reference number list in the table by the comparing means. Only when a comparison result that does not exist in the reference number is obtained, when the communication throughput value that can be added becomes less than the lower limit value, the throughput of the transmission packet is reduced as the priority is lower, and is larger than the upper limit value. And a communication speed control means for increasing the throughput of the transmission packet as the priority becomes higher. 2. The packet monitoring adapter is connected between an S / T point of an integrated services digital network and an S / T point of the common bus, and the release completion message is transmitted on a D channel and a B channel. 2. The throughput control method in packet communication according to claim 1, wherein: