JPH07143122A - Traffic control method - Google Patents

Abstract

(57) [Summary] [Purpose] In a network system consisting of a network and a plurality of nodes connected to the network, control data transmission so as not to exceed the processing capability of each node. [Structure] The execution of transmission is determined based on the buffer information 5 from each node and transmission is performed so that the amount of received data at each node is controlled so as not to exceed the processing capacity of each node. [Effect] It is possible to prevent data loss from the input / output device in the node. Further, in the data processing in the node, real-time data can be transmitted and received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to traffic control in a network system in which a plurality of nodes exchange information with each other on a network.

[0002]

2. Description of the Related Art When a plurality of nodes exchange information with each other on a network in an electronic conference or the like, control of width performance due to the limit of transmission capacity of the network is performed by Tajiri and Sakata et al. Several technical proposals have been proposed, such as academic conference technical report: IDY93-51). However, the above-mentioned proposal is compatible with the range of performance due to the limit of the transmission capacity of the network, and cannot cope with the data processing capacity of the node or the real-time property required by the node.

[0003]

When a plurality of nodes exchange information with each other on a network in an electronic conference or the like, a problem is that the information from the plurality of nodes is sent to each node, which increases traffic. That is.
Methods have been proposed to solve the network bandwidth that occurs due to increasing traffic. However, if the data processing capacity of the node is low or if the communication data processing of the node is temporarily stopped for some reason, the information from the network cannot be processed and data is lost or real time such as voice or video is lost. The real-time property of the data will be impaired.

As described above, a traffic control system that takes into consideration node processing capability as well as network bandwidth control is required.

Therefore, an object of the present invention is to control traffic that enables communication without exceeding the processing capacity of a node in order to prevent loss of data in the node and maintain real-time property of real-time data such as voice and video. It realizes the method.

[0006]

In order to achieve the above object, in the traffic control system of the present invention, a plurality of nodes connected to a network have a reception buffer and a transmission buffer for transmitting and receiving data, and At the side of transmission, the state of the receive buffer is added to the transmitted packet when transmitting, and at the side of reception the transmission is controlled by determining whether to execute or stop the transmission of the packet from the state of the receive buffer added to the received packet. Control traffic.

[0007]

According to the traffic control system of the present invention,
Since the traffic is controlled according to the state of the reception buffer, it is possible to control the traffic according to the processing capacity of the node. Further, since it has a transmission buffer, the data used for the transmission process will not be lost even if the transmission is temporarily stopped. In addition, real-time communication is possible by adjusting the buffer information so that the traffic of data transmitted and received by the node can be maintained in real time.

[0008]

FIG. 1 is a diagram for explaining an embodiment of a traffic control system according to the present invention. In FIG. 1, an input / output device 13 is connected to a transmission / reception device 7, and a transmission / reception device 7 is connected to a network 1 via a network interface 2 at a node A.

Packet 3 transmitted and received by node A in FIG.
Shows the configuration of. The packet 3 is composed of a header 4, buffer information 5 and data 6.

In FIG. 1, the network interface 2 receives a packet 3 from the network 1 and transfers the packet 3 to the transmission / reception device 7, and also a packet 3 transferred from the transmission / reception device 7.
Is transmitted to the network 1. The transmission / reception device 7 converts the packet 3 transferred from the network interface 2 into the data 6 and outputs the data 6 to the input / output device 13.
The data 6 input from is converted into a packet 3 and transferred to the network interface 2. The reception buffer 11 stores the packet 3 transferred from the network interface 2. The transmission buffer 12 stores the data 6 output from the input / output device 13.
The buffer counter 10 counts the packet amount of the reception buffer 11. The memory 8 is for storing the buffer information 5 of the packet 3 transferred from the network interface 2 and the value used when determining transmission. The CPU 9 is used to determine whether the transmitting / receiving device 7 outputs the packet 3 to the network interface 2.

The operation of this embodiment will be described below.

The transmission / reception device 7 stores the packet 3 transferred from the network interface 2 in the reception buffer 11, stores the buffer information 5 of the packet 3 for each transmission node in the memory 8, and adds the buffer counter 10 to
The transmitter / receiver 7 removes the header 4 and the buffer information 5 from the packet 3 stored in the reception buffer 11 and converts it into the data 6. Then, the transmission / reception device 7 outputs the data 6 in the reception buffer 11 to the input / output device 13 in response to the data input request from the input / output device 13, and decrements the buffer counter 10.

The transmission / reception device 7 receives the data 6 from the input / output device 13 and stores it in the transmission buffer 12 in response to the data output request from the input / output device 13. A value for determining execution of transmission is stored in the memory 8, and the CPU 9 uses the buffer information 5 of another node stored in the memory 8 and the execution of transmission stored in the memory 8. The value is compared and the execution of transmission is determined.

When transmission is performed, the header 6 and the buffer counter 10 are added to the data 6 stored in the transmission buffer 12.
Packet 3 with buffer information determined from the value of
And transfer to the network interface 2.

Similar devices are provided in the other nodes B and C, respectively, and the same devices as those described above are designated by the same reference numerals as the respective devices of the node A. In FIG. 1, in order to simplify the description, three nodes A, B, and C are used.
Although the case of nodes is shown, the number of nodes may be three or more, and the operation of all nodes is the same.

In this way, by controlling the transmission based on the buffer information of the receiving buffer from another node, the amount of data in the receiving buffer on the other node is kept in a state not exceeding the processing capacity of the node, Similarly, the transmission information from other nodes is controlled by the buffer information of the receiving buffer of the own node, and the amount of data in the receiving buffer of the own node is kept in a state of not exceeding the processing capacity of the own node. Therefore, it is possible to control the traffic according to the processing capacity of the node connected to the network.

FIG. 3 is a diagram for explaining another embodiment of the traffic control system according to the present invention. The figure shows one of a plurality of nodes connected to the network 1. The network interface 2 receives the packet 3 from the network 1 and transfers the packet 3 to the transmitting / receiving apparatus 7, and also transfers the packet 3 transferred from the transmitting / receiving apparatus 7 to the network 1.
Send to. The transmission / reception device 7 converts the packet 3 transferred from the network interface 2 into data 6 and outputs it to the input / output device 13, converts the data 6 input from the input / output device 13 into packets 3 and transfers them to the network interface 2.

The reception buffer 11 stores the packet 3 transferred from the network interface 2. The transmission buffer 12 stores the data 6 output from the input / output device 13. The buffer counter 10 connected to the reception buffer counts the packet amount of the reception buffer 11. The buffer counter 10 connected to the transmission buffer 12 counts the amount of data stored in the transmission buffer 12. Memory 8
Is for storing the buffer information 5 of the packet 3 transferred from the network interface 2 and the value used when determining transmission. The CPU 9 is used to determine whether the transmitting / receiving device 7 outputs the packet 3 to the network interface 2.

The operation of this embodiment will be described below.

The transmission / reception device 7 stores the packet 3 transferred from the network interface 2 in the reception buffer 11, stores the buffer information 5 of the packet 3 for each transmission node in the memory 8, and stores the packet counter 5 in the reception buffer 11. Then, the transmitter / receiver 7 removes the header 4 and the buffer information 5 from the packet 3 stored in the reception buffer 11 and converts it into the data 6. Then, the transmission / reception device 7 outputs the data 6 of the reception buffer 11 to the input / output device 13 in response to the data input request of the input / output device 13, and subtracts the buffer counter 10 connected to the reception buffer 11.

The transmission / reception device 7 stores the data 6 from the input / output device 13 in the transmission buffer 12 according to the data output request of the input / output device 13 and increments the buffer counter 10 connected to the transmission buffer 12. A value for determining execution of transmission is stored in the memory 8, and the CPU 9 stores the buffer information 5 of another node stored in the memory 8 and the value of the buffer counter 10 connected to the transmission buffer 12 and the memory. The value stored in 8 for determining the execution of the transmission is compared to determine the execution of the transmission. When transmitting, the header 6 is added to the data 6 stored in the transmission buffer 12.
And buffer information determined from the value of the buffer counter 10 connected to the reception buffer 11 and converted into a packet 3 and transferred to the network interface 2 and connected to the transmission buffer 12
Subtract.

If transmission control is performed using only the buffer information of other nodes, the transmission buffer of the own node may overflow and the input data may be lost. By controlling the transmission based on the buffer information of the receiving buffer from the node and the amount of data stored in the transmitting buffer of each node, the amount of data in the receiving buffer on the other node of each node is the processing capacity of the node. It is possible to prevent the loss of data in the transmission buffer of each node while keeping the state of not exceeding. Therefore, it is possible to control traffic according to the processing capability of all nodes while preventing data loss in the transmission buffer.

FIG. 4 is a diagram for explaining another embodiment of the traffic control system according to the present invention. The figure shows one of a plurality of nodes connected to the network 1. The input / output device A14 and the input / output device B15 are connected to the transmission / reception device 7, and the transmission / reception device 7 includes a reception buffer 11 corresponding to each input / output device, and a buffer counter 10 and a transmission buffer 12 connected to the reception buffer 11. . Although there are two input / output devices in the figure, the same applies to two or more input / output devices. The network interface 2 receives the packet 3 from the network 1 and transfers it to the transmission / reception device 7, and also transmits the packet 3 transferred from the transmission / reception device 7 to the network 1. The transmitter / receiver 7 receives the packet 3 transferred from the network interface 2.
Is converted into data 6 and output to an input / output device suitable for the data 6, and the data 6 input from each input / output device is converted into a packet 3 and transferred to the network interface 2.

The reception buffer 11 stores the packet 3 transferred from the network interface 2. The transmission buffer 12 stores the data 6 output from each input / output device. The buffer counter 10 connected to the reception buffer counts the packet amount of the reception buffer 11. The memory 8 is for storing the buffer information 5 of the packet 3 transferred from the network interface 2 and the value used when determining transmission. The CPU 9 is used to determine whether the transmitting / receiving device 7 outputs the packet 3 to the network interface 2.

The operation of this embodiment will be described below.

The transmission / reception device 7 stores the buffer information 5 of the packet 3 transferred from the network interface 2 into the memory 8 according to the type of input / output for each transmission node, and is connected to the input / output device which should output the packet 3. The buffer counter 10 connected to the reception buffer 11 for storing the packet 3 stored in the reception buffer 11 is added, and the transmission / reception device 7 removes the header 4 and the buffer information 5 from the packet 3 stored in the reception buffer 11 to obtain the data 6 Convert to.

Then, the transmission / reception device 7 outputs the data 6 of the reception buffer 11 to each input / output device according to the data input request of each input / output device, and subtracts the buffer counter 10 connected to the reception buffer 11. The transmission / reception device 7 stores the data 6 from each input / output device in the transmission buffer 12 connected to each input / output device according to the data output request of each input / output device. A value for determining execution of transmission is stored in the memory 8, and the CPU 9 uses the buffer information 5 of another node stored in the memory 8 and the execution of transmission stored in the memory 8. The value is compared and the execution of transmission is determined. When transmitting, packet 3 is created by adding buffer information 5 determined from the value of header 4 and buffer counter 10 to data 6 stored in transmission buffer 12.
To the network interface 2 and the buffer counter 10 connected to the transmission buffer 12 is decremented.

In this embodiment, even when a plurality of input / output devices of each node are provided, by providing a receive buffer corresponding to each input / output device, each node can be identified by the buffer information of the receive buffer of each node. The transmission from other nodes is also controlled, and it becomes possible to keep the amount of data in the reception buffer of each node within the processing capacity of each node. Therefore, it is possible to control the traffic according to the processing capacity of all the nodes. Further, the priority of traffic can be controlled by giving priority to each input / output device of each node and reflecting the priority in the buffer information to control transmission.

FIG. 5 is a diagram for explaining another embodiment of the traffic control system according to the present invention. The figure shows one of a plurality of nodes connected to the network 1. An input / output device A14 and an input / output device B15 are connected to the transmission / reception device 7, and a reception buffer 11 corresponding to each input / output device, a buffer counter 10 connected to the reception buffer 11, a transmission buffer 12, and a transmission are transmitted to the transmission / reception device 7. A buffer counter 10 connected to the buffer 12 is provided. Although there are two input / output devices in the figure, the same applies to two or more input / output devices. The network interface 2 receives the packet 3 from the network 1 and transfers it to the transmission / reception device 7, and also transmits the packet 3 transferred from the transmission / reception device 7 to the network 1. The transmission / reception device 7 converts the packet 3 transferred from the network interface 2 into data 6 and outputs the data 6 to an input / output device suitable for the data 6, and the data 6 input from each input / output device is converted into the packet 3
And transfer to the network interface 2.

The reception buffer 11 stores the packet 3 transferred from the network interface 2. The transmission buffer 12 stores the data 6 output from each input / output device. The buffer counter 10 connected to the reception buffer 11 counts the packet amount of the reception buffer 11. The buffer counter 10 connected to the transmission buffer 12 counts the amount of data stored in the transmission buffer 12. The memory 8 is for storing the buffer information 5 of the packet 3 transferred from the network interface 2 and the value used when determining transmission. The CPU 9 is used to determine whether the transmitting / receiving device 7 outputs the packet 3 to the network interface 2.

The operation of this embodiment will be described below.

The transmitter / receiver 7 stores the buffer information 5 of the packet 3 transferred from the network interface 2 in the memory 8 according to the type of input / output device for each transmission node, and is connected to the input / output device to which the packet 3 should be output. The buffer counter 10 connected to the receiving buffer 11 that stores the packet 3 in the receiving buffer 11
The transmitter / receiver 7 removes the header 4 and the buffer information 5 from the packet 3 stored in the reception buffer 11 and converts it into the data 6.

Then, the transmission / reception device 7 outputs the data 6 of the reception buffer 11 to the input / output device 13 according to the data input request of each input / output device, and subtracts the buffer counter 10 connected to the reception buffer 11. The transmission / reception device 7 receives the data output request from each input / output device and sends the data 6 from each input / output device to the transmission buffer 12
And the buffer counter 10 connected to the transmission buffer 12 is added. A value for determining execution of transmission is stored in the memory 8, and the CPU 9 is connected to the buffer information 5 of another node stored in the memory 8 and the transmission buffer 12 connected to each input / output device. The value of the buffer counter 10 that is present is compared with the value stored in the memory 8 for determining the execution of transmission, and the execution of transmission is determined. When performing transmission, the buffer information determined from the values of the header 4 and the buffer counter 10 is added to the data 6 stored in the transmission buffer 12, converted into a packet 3 and transferred to the network interface 2, and the transmission buffer 1
The buffer counter 10 connected to 2 is subtracted.

In this embodiment, even when a plurality of input / output devices are provided, each input / output device is provided with a reception buffer and a transmission buffer corresponding to each node. The transmission from other nodes can also be controlled, and the amount of data in the receive buffer of each node can be kept in a state that does not exceed the processing capacity of each node. By controlling transmission based on the amount of data stored in the transmission buffer of each node, each node can keep the amount of data in the reception buffer on the other node not exceeding the processing capacity of each node. It is possible to prevent data loss of a plurality of input / output devices in the transmission buffer of the above. Therefore, it is possible to control traffic according to the processing capability of all nodes while preventing data loss in the transmission buffer. Further, the priority of traffic can be controlled by giving priority to each input / output device of each node and reflecting the priority in the buffer information to control transmission.

FIG. 6 is a block diagram of an embodiment of a traffic control system according to the present invention.

The FDDI network 16 is used as the network 1. The configuration of each node, node A, node B, and node C is FD as network interface 2.
Using the DI interface 17, the memory 8 for storing the buffer information 5 and values used for determining transmission, the reception buffer 11, the transmission buffer 12, and the buffer counter 1
0 is logically configured on the memory 19, and the function of the transmitting / receiving device 7 and the function of the CPU 9 are executed by the CPU 18.
Video CODEC 20 and audio CODE as input / output devices
Using EC, they will be connected by the VMEbus 22. Although the number of nodes is 3, even if it is 3 or more, the configuration of the node is the same and the operation of each node is the same.

The operation of this embodiment shown in FIG. 6 will be described below.

When the FDDI interface 17 receives the packet 3 from the FDDI network 16, the CPU 18
Identifies the sender and the data type from the header 4 of the packet 3, stores the buffer information 5 in the memory on the memory 19 corresponding to the sender and the data type, and stores the data 6 on the memory 19 corresponding to the data type. The data is transferred to the logically configured receive buffer and the buffer counter corresponding to the logically configured receive buffer is added on the memory 19.

Then, the video CODEC 21 and the audio C
When an input request is issued from the ODEC 22, the CPU 18 is interrupted, and the CPU 18 interrupts the data corresponding to the interrupted CODEC from the memory 19 by the interrupted CO.
Output to DEC. Video CODEC 21 and audio CO
When data is generated in the DEC 22, the CPU 18 is interrupted and the generation of data is notified, and the CPU 18 reads the data from the interrupted CODEC into a transmission buffer logically configured on the memory 19 according to the type of data, Memory 1 of the transmission buffer according to the type of data
9 add a logically configured buffer counter.

The CPU 18 then uses the buffer information of other nodes on the memory 19 and the video C that is logically constructed.
The ODEC and audio CODEC transmit buffers and receive buffers are compared with each other to determine whether or not to transmit. When transmitting, the header and the value of the receive buffer buffer counter are added as buffer information to the packet. The data is converted and transferred to the FDDI interface 16, and the buffer counter of the transmission buffer of the transferred data is decremented. The packet transferred to the FDDI interface 17 is the FDDI network 16
Through other nodes.

By transmitting and receiving packets in this way, the traffic can be suppressed to the processing capacity of each node, and the processing capacity of the nodes can be reduced to video CODEC and audio CODE.
If the input / output load of C can be processed, smooth input / output of video and audio can be performed. Further video CODE
By giving priority to C and voice CODEC, traffic control using priority can be performed.

[0042]

As described above, according to the present invention, it becomes possible to control the traffic so as not to exceed the data processing capacity of each node connected to the network, and it is possible to control the information even in the application such as the electronic conference. You can send and receive smoothly. Also, since data can be sent and received using priority, data with high priority is given priority when traffic load is heavy, and then given lower priority when there is a margin in the processing capacity of the node. By transmitting and receiving data every time, the processing capacity of the node can be used more effectively.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a traffic control system according to the present invention.

FIG. 2 is a block diagram of another embodiment of a traffic control system according to the present invention.

FIG. 3 is a block diagram of another embodiment of a traffic control system according to the present invention.

FIG. 4 is a block diagram of another embodiment of a traffic control system according to the present invention.

FIG. 5 is a block diagram of another embodiment of a traffic control system according to the present invention.

FIG. 6 is a block diagram of another embodiment of a traffic control system according to the present invention.

[Explanation of symbols]

1 ... network, 2 ... network interface,
3 ... Packet, 4 ... Header, 5 ... Buffer information, 6 ... Data, 7 ... Transceiver, 8, 19 ... Memory, 9, 18 ...
CPU, 10 ... Buffer counter, 11 ... Reception buffer, 12 ... Transmission buffer, 13 ... Input / output device, 14 ... Input / output device A, 15 ... Input / output device B, 16 ... FDDI network, 17 ... FDDI network interface, 20 ... Video CODEC, 21 ... Audio CODEC, 2
2 ... VME bus.

Claims (6)

[Claims] 1. A plurality of nodes are coupled to a network,
This is a traffic control method for communication at two or more points, in which the sending side adds the status of the receiving buffer of its own node to the packet to be sent as buffer information for transmission, and the receiving side adds to the received packet. A traffic control method characterized by storing the stored buffer information and controlling transmission based on the stored buffer information. 2. The traffic control method according to claim 1, wherein transmission control is performed based on buffer information stored from the received packet and the state of the transmission buffer of the own node. 3. The traffic control system according to claim 1, wherein there are a plurality of inputs and outputs, and the state of the reception buffer corresponding to each output is added to the packet as buffer information and transmitted. . 4. The traffic control method according to claim 3, wherein the transmission control is performed based on the buffer information stored from the received packet and the state of the transmission buffer of the own node corresponding to each input. method. 5. The traffic control system according to claim 3, wherein each input / output is given a priority, and the states of all reception buffers are added to the packet as buffer information and transmitted. 6. The traffic control method according to claim 5, wherein transmission control is performed based on buffer information added to the received packet and a state of a transmission buffer corresponding to each input having priority in the own node. Traffic control method.