JPH07143151A - Packet transmission system - Google Patents

Abstract

PURPOSE:To manage a transmission quantity from each user terminal equipment by varying the allocation of packets to each user terminal equipment. CONSTITUTION:The system is provided with a management packet, a management station 2 sends allocated information by using the management packet, and each user terminal equipment 3 replies an allocation update request against the allocation information. The management station 2 sends the allocation update information included in the management packet and sends the address of the user terminal equipment 3 allocated by a data packet as a sender address. When the sender address is coincident with its own address, each user terminal equipment 3 adds a destination address and user data to the data packet and sends the packet and receives the user data when the destination address is coincident with its own address.

Description

Detailed Description of the Invention

[0001]

The present invention is used in digital communication systems. INDUSTRIAL APPLICABILITY The present invention is used in a packet communication system that uses a loop transmission line. In particular, the present invention relates to a packet transmission system in which empty packets are effectively used to improve packet communication efficiency.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a transmitting / receiving unit of a user terminal of a conventional packet transmission system.

A packet communication system is used in a recent network system, and a packet transmission system of this system transmits a packet transmission system when all packets are in use when each packet is assigned to each user terminal. The capacity was fully utilized, but the transmission capacity could not be fully utilized when there were unused packets. Further, when it is necessary to send out more packets assigned by a certain user terminal, even if there is a vacancy in the packet assigned to another user, it cannot be used.

In order to solve such a defect, Japanese Patent Laid-Open No. 58-58
As disclosed in Japanese Patent Application Laid-Open No. 170250 and Japanese Patent Laid-Open No. 59-45741, a method is proposed in which data indicating the usage status (in use, free, etc.) of the packet is added to the packet to utilize the empty packet. ing. FIG. 9 shows an outline of the user terminal. The packet data entering the user terminal 3A from the packet transmission line 1 is accumulated in the data memory 62 from the receiving circuit 61, and the input / output control circuit 63 uses the data destination and use. After the situation is inspected, data input / output and the like are performed, and the result is sent again to the packet transmission line 1 by the transmission circuit 64.

[0005]

However, in such a conventional packet transmission system, the use of the empty packet is left to the user terminal, so that the empty packet cannot be properly managed. For example,
When a certain user terminal sends out a large amount of data, the next user terminal cannot obtain an empty packet and cannot output data.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a packet transmission system in which packet allocation to each user terminal is variable and the transmission amount from each user terminal can be managed.

[0007]

The present invention is directed to a loop-shaped packet transmission line, a management station connected to the packet transmission line for managing packets on the packet transmission line and outputting allocation information thereof, and a management station for the packet. In a packet transmission system provided with a plurality of user terminals connected to a transmission line and communicating with each other via a packet allocated based on the allocation information, the management station adds the allocation information to a management packet, Means for outputting the allocation update request to the management packet, and outputting the allocation update request to the allocation information added to the management packet based on the required transmission amount. The management station attaches the allocation information updated based on the allocation update request to the management packet. Packet transmission system characterized in that it includes means for and output.

According to the present invention, the frame on the packet transmission path is assigned a management packet including allocation information output by the management station and an allocation update request output by each user terminal, and an allocation output by the management station. The address of the user terminal can be composed of a source address, a destination address output by the user terminal, and a plurality of data packets including user data.

[0009]

[Operation] A management packet is provided, and by this management packet,
The management station sends the allocation information to each user terminal,
The user terminal returns an allocation update request for this allocation information based on the required transmission amount. The management station transmits the allocation information updated based on the allocation update request from each user terminal by a management packet, and also transmits the address of each allocated user terminal as a source address by a data packet. When the source address matches its own address, each user terminal adds a destination address and user data and transmits it. When the destination address matches its own address, the user terminal fetches the transmission data. As a result, the packet allocation to each user terminal can be made variable, and the amount of transmission from each user terminal can be managed.

This operation can be performed for each frame in addition to the system startup. Further, it can be set to be performed for every plural frames.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a packet transmission system according to an embodiment of the present invention. FIG. 2 is a block configuration diagram of a transmission / reception unit of a user terminal of the packet transmission system of the present invention. 1 and 2, the packet transmission system includes a loop-shaped packet transmission line 1 and a packet transmission line 1
A management station 2 connected to the packet transmission line 1 for managing the packets and outputting the allocation information; and a plurality of communication stations connected to the packet transmission line 1 for communicating with each other via the packets allocated based on the allocation information. The user terminal 3 includes a transmitter / receiver 14 connected to the packet transmission line 1, and the transmitter / receiver 14 includes an input buffer 11, an output buffer 12, and an input buffer 1.
1 and the input / output control unit 13 for controlling the output buffer 12
Including and

A feature of the present invention is that the management station 2 includes means for adding the allocation information to a management packet and outputting the management packet to the user terminal 3, and the user terminal 3 is based on the required transmission amount. The management station 2 includes means for adding an allocation update request to the management packet and outputting the allocation information with respect to the allocation information.
Includes means for adding the allocation information updated based on the allocation update request to the management packet and returning it.

Further, according to the present invention, the frame on the packet transmission line 1 includes a management packet including allocation information output by the management station 2 and an allocation update request output by each user terminal 3, and an allocation output by the management station 2. The address of the stored user terminal 3 is composed of a source address, a destination address output from the user terminal 3, and a plurality of data packets including user data.

The operation of the packet transmission system having such a configuration will be described.

FIG. 3 is a block diagram of a packet frame of the packet transmission system of the present invention.
Is one management packet 21 and N data packets 2
It consists of two. FIG. 4 is a packet configuration diagram of the packet transmission system of the present invention. One packet is a synchronization code 30, a packet type (indicating a management packet 21 or a data packet 22) 31, a data area 32 and an error detection bit area 33. Consists of. FIG. 5 is a diagram showing the contents of the data area of the management packet of the packet transmission system of the present invention, which includes data 321 from the management station 2 to the user terminal 3 and data 320 from the user terminal 3 to the management station 2. FIG. 6 is a diagram showing the contents of a data packet of the packet transmission system of the present invention.
It includes a source address 322, a destination address 323 and user data 324. FIG. 7 is a flowchart showing the operation of the management station of the packet transmission system of the present invention. FIG. 8 is a flowchart showing the operation of the user terminal of the packet transmission system of the present invention.

1 to 8, when the user terminal 3 fetches the management packet 21, the user terminal 3 inspects the portion allocated to itself from the contents of the data area 320 from the management station 2. In this part, the number of packets allocated to itself is added in one frame (the Mth frame) having the management packet 21 at the head, and the user terminal 3 and this currently required transmission amount. In consideration of the above, the number of packets requested to the management station 2 in the (M + 1) th frame is determined. Then, this number is added to the portion of the data 321 for the management station 2 assigned to itself. When the management station 2 extracts the number of packets requested by each user terminal 3 from the management packet 21, the management station 2 determines a packet to be assigned to each user terminal 3 in the (M + 1) th frame according to a predetermined method, and determines the (M + 1) th frame. The result is transmitted by the data 320 of the management packet 21 of FIG. The method of assigning to each user terminal 3 does not need to be particularly limited, and may be a method that is considered appropriate for the system. For example, each user terminal 3 may send out the requested number of packets and the degree of urgency according to its assigned portion of the data 321, and the management station may thereby determine the packet to be assigned to each user terminal 3. The above is the description of the method for determining the distribution of data packets.

Data transfer is performed as follows.
First, the management station 2 adds only the source address 322 and sends it. Each user terminal 3 adds a destination address 323 when it takes in a packet containing its own source address 322, and adds necessary data as user data 324. If a packet containing its own destination address is captured, the user data 324 is acquired.

[0019]

As described above, the present invention has an excellent effect that the packet allocation to each user can be made variable and the transmission amount from each user can be managed.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a packet transmission system according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a transmission / reception unit of a user terminal of the packet transmission system of the present invention.

FIG. 3 is a configuration diagram of a packet frame of the packet transmission system of the present invention.

FIG. 4 is a packet configuration diagram of the packet transmission system of the present invention.

FIG. 5 is a diagram showing contents of a data area of a management packet of the packet transmission system of the present invention.

FIG. 6 is a diagram showing the contents of a data packet of the packet transmission system of the present invention.

FIG. 7 is a flowchart showing the operation of the management station of the packet transmission system of the present invention.

FIG. 8 is a flowchart showing the operation of the user terminal of the packet transmission system of the present invention.

FIG. 9 is a block configuration diagram of a transmission / reception unit of a user terminal of a conventional packet transmission system.

[Explanation of symbols]

1 packet transmission path 2 management station 3 3A user terminal 11 input buffer 12 output buffer 13, 63 input / output control unit 14, 14A transmission / reception unit 20 packet frame 21 management packet 22 data packet 30 synchronization code 31 packet type 32 data area 33 error Bit area for detection 61 Reception circuit 62 Memory 64 Transmission circuit 320 Data (data from user terminal to management station) 321 Data (data from management station to user terminal) 322 Source address 323 Destination address 324 User data

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[Procedure amendment]

[Submission date] November 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

A packet communication system is used in a recent network system, and a packet transmission system of this system transmits a packet transmission system when all packets are in use when each packet is assigned to each user terminal. The capacity was fully utilized, but the transmission capacity could not be fully utilized when there were unused packets. Further, in case where the user terminal is required to be sent over split hit the packets in and Tsu Naka available even if there is room in the even packets assigned to other users.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

FIG. 3 is a block diagram of a packet frame of the packet transmission system of the present invention.
Consists of one of the management packets 21 and N data packets 22. FIG. 4 is a packet configuration diagram of the packet transmission system of the present invention. One packet is a synchronization code 30, a packet type (indicating a management packet 21 or a data packet 22) 31, a data area 32 and an error detection bit area 33. Consists of. FIG. 5 is a diagram showing the contents of the data area of the management packet of the packet transmission system of the present invention, from the management station 2 to the user terminal 3.
Data 321 to the management station 2 from the user terminal 3. FIG. 6 is a diagram showing the contents of a data packet of the packet transmission system of the present invention, which includes a source address 322, a destination address 323 and user data 324. FIG. 7 is a flowchart showing the operation of the management station of the packet transmission system of the present invention. FIG. 8 is a flowchart showing the operation of the user terminal of the packet transmission system of the present invention.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

1 to 8, when the user terminal 3 fetches the management packet 21, the user terminal 3 inspects the portion of the contents of the data area 320 from the management station 2 which is assigned to itself. In this part a full record over arm to the top of the management packet 21 (the M-th frame) are added the number of packets assigned to you, the user terminal 3 which the current In consideration of the required transmission amount, the number of packets requested to the management station 2 in the (M + 1) th frame is determined. And added to their assigned portions of the data 32 0 against this number to the management station 2. When the management station 2 extracts the number of packets requested by each user terminal 3 from the management packet 21, the management station 2 determines a packet to be assigned to each user terminal 3 in the (M + 1) th frame according to a predetermined method, and determines the (M + 1) th frame. The result is transmitted by the data 320 of the management packet 21 of FIG.
The method of assigning to each user terminal 3 does not need to be particularly limited, and may be a method that is considered appropriate for the system. For example, each user terminal 3 may send out the requested number of packets and the degree of urgency according to its assigned portion of the data 321, and the management station may thereby determine the packet to be assigned to each user terminal 3. The above is the description of the method for determining the distribution of data packets.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (2)

[Claims] 1. A loop-shaped packet transmission line, a management station connected to this packet transmission line for managing packets on this packet transmission line and outputting its allocation information, and this allocation information connected to this packet transmission line. In a packet transmission system provided with a plurality of user terminals that communicate with each other via packets assigned based on the above, the management station adds means for outputting the allocation information to the plurality of user terminals by adding the allocation information to the management packet. The plurality of user terminals includes means for adding an allocation update request to the management packet and outputting the allocation update request to the allocation information added to the management packet based on the required transmission amount. A means for adding the allocation information updated based on the allocation update request to the management packet and outputting the management packet; A packet transmission system characterized in that 2. The frame on the packet transmission line includes a management packet including allocation information output by the management station and an allocation update request output by each user terminal, and an allocated user terminal output by the management station. 2. The packet transmission system according to claim 1, wherein the address comprises a source address, a destination address output from the user terminal, and a plurality of data packets including user data.