JPH03268641A - Method and apparatus for controlling congestion - Google Patents

Abstract

PURPOSE:To attain data communication without dialing restriction by limiting a request throughput of a terminal equipment with low priority in response to the congestion state of a relay line. CONSTITUTION:When a terminal equipment 1 makes a call, a line circuit 2 connects to a priority identification circuit 9 to identify the priority of the terminal equipment 1. A system control section 7 receives a call of the terminal equipment 1 to discriminate the destination of the call by the terminal equipment 1. When it is discriminated that the terminal equipment 1 selects a relay line, the start of throughput control is commanded to a throughput control circuit 10. Upon the receipt of priority class information of the terminal equipment 1 from the priority identification circuit 9 and congestion state information from a congestion state monitor circuit 8, the throughput control circuit 10 decides a throughput according to a predetermined criterion and informs the result to the terminal equipment 1. The system control section 7 controls a relay line control line 4 according to the throughput to connect the terminal equipment 1 to the relay line 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to data communications, and particularly to a method and apparatus for controlling congestion in trunk lines.

[Conventional technology]

With conventional congestion control devices, when terminals are connected to a trunk line, when the usage rate of the trunk line becomes high, there are methods that restrict most of the calls from low-priority terminals, or uniformly reduce throughput regardless of the terminal class. This was done through a restrictive method.

[Problem to be solved by the invention]

In the conventional method of connecting the congestion control device to the relay line described above, where most of the calls from low-priority terminals are restricted, the low-priority terminals cannot use the relay line until the call restriction is lifted. There is a drawback. Furthermore, the method of uniformly limiting throughput regardless of terminal class has the disadvantage that throughput is limited even for terminals with high priority.

SUMMARY OF THE INVENTION An object of the present invention is to provide a congestion control device that eliminates the above-mentioned drawbacks and allows a terminal to perform data communication without being subjected to outgoing call restrictions.

[Means for Solving the Problems] The present invention provides a congestion control method for a packet switching system having throughput negotiation, in which priority classes are established for terminals, and terminals with lower priority are assigned a priority class according to the congestion state of the trunk line. It is characterized by limiting the requested throughput.

The present invention is also a congestion control device for a packet switching system having throughput negotiation, which is characterized by providing priority classes for terminals and limiting the requested throughput of terminals with lower priority according to the congestion state of the trunk line. do.

Furthermore, it has a terminal that makes a call, a line circuit that connects to this terminal, and a relay line control circuit that connects the line circuit to a relay line, and adjusts the required throughput of a terminal with a lower priority depending on the congestion state of the relay line. A congestion control device that controls and connects to a trunk line, the device comprising: a priority identification circuit that determines the priority of the terminal through a line circuit; and a trunk line control circuit that monitors the congestion state of the trunk line. a trunk line control circuit; a control unit that determines the destination to which a connected terminal makes a call via the line circuit; and issues an instruction to control throughput when the terminal selects the trunk line; The present invention is characterized by comprising a throughput control circuit that determines a throughput value according to a predetermined criterion based on the priority order and the congestion state, and notifies the terminal of the throughput value via the line circuit.

〔Example〕

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

FIG. 1 is a functional block diagram showing an embodiment of the congestion control device of the present invention.

This congestion control device is, for example, a packet switching system having throughput negotiation, and the terminal 1
, a line circuit 2 , a relay line control circuit 4 , and a control device 11 that controls the line circuit 2 and the relay line control circuit 4 .

The control device 11 also includes a system control section 7, a congestion state monitoring circuit 8, a priority identification circuit 9, and a throughput control circuit 10.

Terminal 1 makes a call to line circuit 2 in order to connect to the relay line and perform data communication.

The line circuit 2 connects the terminal 1 to the system control section 7. of the control device 11. Priority identification circuit 9. Throughput control circuit 10
Connect to. It is also connected to the relay line control circuit 4 via the data bus 3 and the data bus 3.

The relay line control circuit 4 connects the terminal 1 to the line circuit 2 and the data bus 3 under the control of the system control unit 7 of the control device 11.
It is connected to the trunk line 5 via.

When the terminal 1 makes a call, the system control unit 7 of the control device 11 determines the destination of the call. If it is determined that the trunk line 5 is selected as a result of this determination, the system control unit 7 instructs the throughput control circuit 10 to start throughput control.

The congestion status monitoring circuit 8 periodically monitors the congestion status of the relay line 5 connected to the relay line control circuit 4 and sends congestion status information to the throughput control circuit 10.

The priority identification circuit 9 identifies the priorities of a plurality of terminals including the terminal 1, and sends priority class information to the throughput control circuit 10.

The throughput control circuit 10 receives the congestion state information from the congestion state monitoring circuit 8 and the priority class information from the priority identification circuit 9 according to instructions from the system control unit 7, and receives the congestion state information from the congestion state monitoring circuit 8 and the priority class information from the priority identification circuit 9. The throughput value is determined and notified to the terminal 1 via the line circuit 2.

Next, the operation of this embodiment will be explained. The congestion status monitoring circuit 8 periodically connects the relay line 5 to the relay line 5 via the signal line 6e.
The state of congestion is being monitored.

When the terminal 1 makes a call, the line circuit 2 is connected to the priority identification circuit 9 via the signal line 6a. The priority order identification circuit 9 then identifies the priority order of the terminal 1. On the other hand, the system control unit 7 transmits the call from the terminal 10 to the line circuit 2. signal line 6
C, and determines the destination of the call from terminal 1. Then, when determining that terminal l has selected trunk line 5,
The throughput control circuit 10 is instructed to start throughput control. Upon receiving the priority class information of the terminal worker from the priority identification circuit 9 and the congestion state information from the congestion state monitoring circuit 8, the throughput control circuit 10 determines the throughput value allowed for the terminal 1 according to predetermined criteria. . Then, the terminal 1 is notified via the signal line 6b and the line circuit 2.

The system control unit 7 controls the signal line 6 according to the throughput value.
It controls the relay line control circuit 4 via d and connects the terminal 1 to the relay line wA5.

As described above, the congestion control device of the present invention has the function of limiting the requested throughput of terminals with lower priority according to the priority set for each terminal and the congestion state of the trunk line.

〔Effect of the invention〕

As explained above, the present invention has the effect of controlling the requested throughput by monitoring the congestion state of the relay line and the priority class of the terminal, so that even a terminal with a low priority can perform data communication without being restricted from calling. .

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing one embodiment of the present invention. 7...System control unit 8...Congestion state monitoring circuit 9...Priority identification circuit 10...Throughput control circuit 11...Control device

Claims (3)

[Claims] (1) A congestion control method for a packet switching system having throughput negotiation, which is characterized by providing priority classes for terminals and limiting the requested throughput of terminals with lower priority according to the congestion state of the trunk line. Congestion control method. (2) A congestion control device for a packet switching system having throughput negotiation, characterized by providing priority classes for terminals and limiting the requested throughput of terminals with lower priority according to the congestion state of the trunk line. Congestion control device. (3) A request from a terminal that has a terminal that makes a call, a line circuit that connects to this terminal, and a relay line control circuit that connects the line circuit to a relay line, and that has a lower priority depending on the congestion state of the relay line. A congestion control device that controls throughput and connects to a trunk line, comprising a priority identification circuit that determines the priority of the terminal via a line circuit, and a trunk line control circuit that monitors the congestion state of the trunk line. a relay line control circuit that determines the destination to which a connected terminal makes a call via the line circuit, and issues an instruction to control throughput when the terminal selects the relay line; , a throughput control circuit that determines a throughput value according to a predetermined criterion based on the priority order and the congestion state, and notifies the terminal of the throughput value via the line circuit. Congestion control device.