JPS6072357A - Multiple address communication system by packet communication - Google Patents

Abstract

PURPOSE:To enable the titled system to confirm the arrival of multiple address communication address to all destinations of transmission by transmitting an unconfirmed reception signal when the reception of multiple address communication packet is impossible within a specified time after receiving a previous notice of multiple address communication. CONSTITUTION:Packet signals are transmitted in a transmission line 2 between three or more information processing devices 1, and multiple address communication is conducted from one of the devices 1 to another device 1. A device 1 takes previous notice of multiple address communication to another device 1 immediately before transmitting multiple address communication. On receiving the previous notice, another device 1 prohibits the transmission of packet signals to the transmission line 2, and when the multiple address communication from the device 1 is not received after the lapse of specified time after receiving the previous notice, transmits an unconfirmed reception signal to the device 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a broadcast communication system in a packet communication system in which a transmission path is shared between a plurality of information processing apparatuses.

[Description of prior art]

Conventionally, in broadcast communication, when one arbitrary station sends a message, -ji to multiple n stations by broadcast communication, one reception confirmation page (hereinafter referred to as ACK bucket) is sent from the destination of n stations. When replying to the transmission source of the station, n number of A is sent to the transmission source.
CK packets are concentrated in a short period of time, and a large amount of time is consumed in processing them. Therefore, in the case of broadcast communication, instead of using this method, each destination does not return a response. Therefore, the sender is Broadcast Communication Pagano 1-
If it is not possible to confirm the arrival of the packet, and reception is not possible due to an overflow of the buffer device or an error, the broadcast communication packet remains unreceivable at the destination, and a retransmission request cannot be made.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a broadcast communication system that can confirm the arrival Gff of broadcast communication packets to all destinations.

[Features of the invention]

The present invention enables broadcast communication to be carried out more reliably by transmitting a broadcast communication advance notice before the transmitting station performs broadcast communication, and prohibiting the transmission of general packets after the broadcast communication advance notice. , the destination station that received the broadcast communication packet did not return a ``71-'' to 80, and even after a predetermined period of time, the destination station that received the broadcast communication packet did not receive the unacknowledged packet from only the destination station that did not receive the same (44 communication packet). (hereinafter referred to as a NAK packet) is configured so that it is sent back to the transmission source station.

[Explanation based on examples]

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram of a packet communication system according to the present invention. FIG. 1 (al is a block diagram of a bus-type packet communication system. FIG. 1tb+ is a block diagram of a loop-type packet communication system.

An information processing device (hereinafter referred to as a node station) 1 of each node is connected to a common transmission path 2 in a lotus shape or a loop shape via a network interface section 3.

FIG. 2 is a block diagram of the node station (1) of the present invention.

Input/output between the network 1 of the node station 1 and the transmission path 2 of the work control section 11 is connected to the common transmission path 2 via the network interface section 3. The output of the received packet and the input of the general transmission packet of the network control section 11 are also connected to the station host I.13 via the post connection section 12.

The operation of the node station having such a configuration will be explained. The packets on the transmission line 2- are sent to the stage 31 boss I3 via the network no-fin interface unit 3, the network control unit 11, and the post connection unit 12.On the contrary, the general transmission packets from the station boss 13 are The data is sent as a packet onto the transmission path 2 via the post connection section 12, the network controller 1-roll section 11, and the network interface section 3.

Figure 3 shows the network control section (11) of the present invention.
) is a block configuration diagram of.

Transmission of node interface section 2I of network control section II! ? Input/output with 32 is via common transmission path 2.
It is connected to the top via the network interface section 3. The output of the receiving packet 1- of the node interface section 21 is sent to the receiver 22, the decoder 23, and the S/P converter 2.
4 and is connected to the input of the received packet of the 'ζ control section 25. The transmitting packet number 1 output of the control unit 25 includes a P/S
Conversion (1 < 2 (i, : 1 - n 1 - da 27.1' Connected to the input of the transmission packet of the notebook interface 21 via the controller 28. The output of the reception packet of the control unit 25 and the general transmission bucket input is connected to the host connection section 12.

The operation of the network control section having such a configuration will be explained. Packets on the transmission path 2 are sent to the decoder section 23 via the network interface section 3, the node interface section 21, and the receiver section 22, and are decoded. The decoded received packet I frame is S/
The P conversion section 24 converts the serial data into parallel data and sends it to the control section 25. Further, the transmission packet from the control unit is converted from parallel data to serial data by the P/S conversion unit 26 and sent to the encoder unit 27. The encoded transmission packet frame is sent to the driver unit 28
, No. 1' ink face section 21, and No. 1 work ink face section 3 to the transmission path 2-.

FIG. 4 shows a typical packet frame of the present invention. Packet frame is start frame 31
, destination address field 32, source address field 33, control field 3
4, a data field 35, an FCS field F36, and an end flag 37.

FIG. 5 is a block diagram of the control section (25) of the present invention.

The parallel data output of the received packet of the S/P conversion section 24 is connected to the reception control section 41 . Processor section 41
The output and input of each control signal are the reception control unit 4■,
It is connected to a transmission/reception buffer section 43, an interface 44, and a transmission control section 45, respectively.

The output of the parallel data matching the self-address of the reception control section 41 is connected to the transmission/reception buffer section 43 . The parallel data output of the transmission/reception buffer section 43 and the input of the general transmission bucket are connected to the host connection section 12 via an interface 44 . The general transmission packet output of the transmission/reception buffer section 43 is connected to the transmission control section 45,
The output of the transmission packet of the transmission control section 45 is connected to the P/S conversion section 26 .

The operation of the control section having such a configuration will be explained. S/
The parallel data from the P converter 24 is compared with the destination address field 32 in FIG. 4 and the own station address (station address, group address, -broadcast address) in the reception controller 41, and if they match, It is sent to the transmission/reception buffer section 43. If they don't match,
The reception control unit 41 discards the packet. Furthermore, the general transmission packet stored in the transmission/reception buffer section 43 is sent to the P/S conversion section 26 via the transmission control section 45 in response to a command from the processor section 42 .

FIG. 6 is a block diagram of the reception control section (41) of the present invention.

The parallel data of the received packet of the S/P converter 24 is output by the broadcast notification packet detector 51 of the reception controller 41;
Broadcast packet detection unit 52, NAK packet detection unit 53,
ACK packet detection section 54 and buffer reception control section 5
Connected to 5.

The operation of the reception control section having such a configuration will be explained.

The broadcast notification packet detection unit 51 outputs the broadcast notification packet detection signal 61, the broadcast packet detection unit 52 outputs the broadcast packet detection signal 62, the NAK packet detection unit 53 outputs the packet detection signal 63 to N8, and ACK Packet Detection Unit 54 (7) The output of the ACK packet detection signal 4 is connected to the input port unit 56 of the processor 42 .

The input/output of the buffer reception control signal 65 of the buffer reception control section 55 is connected to the input/output port 56 . The output of the received packet of the buffer reception control section 55 is connected to the transmission/reception buffer section 43 .

The input/output of control signals of the input/output boat 56 is connected to a processor (not shown) via an internal bus 66. S/P converter 2
4, the reception control unit 41 performs a frame check on the received packet, and if the received packet is a broadcast notification packet I, it is detected by the broadcast notification packet I detection unit 51, and the processor unit 42 A broadcast notification packet detection signal 61 is sent to the input/output boat section 56 of the . Similarly, if it is a broadcast packet, it is detected by the broadcast packet detection section 52, and if the broadcast packet detection signal 62 is an NA K packet, it is detected by the broadcast packet detection section 52.
K packet 1 - NAK packet detection signal 63 in the detection unit 53
However, if it is an ACK packet, it is detected by the ACK packet detection section 54, and an ACK packet detection signal 64 is sent to the input/output capo-1 section 56 of the processor section 42. The packets are simultaneously sent to the buffer reception control section 55, and if the data is sent to the transmission/reception buffer section 43, it is controlled by the buffer reception control signal 65 and taken into the transmission/reception buffer section 43.

The input/output port section 56 inside the processor section 42 is connected to the processor via an internal bus 66.

FIG. 7 is a block diagram of the transmission control section (45) of the present invention. 1 Broadcast notification packet transmission signal 81, broadcast packet transmission signal 82, NAK packet transmission signal 83 and A of the input/output boat 56 connected to the internal bus 66 of the processor section 42
Each output of the CK packet sending signal 84 is connected to a broadcast notification packet detection section 71, a broadcast packet sending section 72, a NAK bucket sending section 73, and an ACK packet sending section. Buffer transmission control signal 8 of input/output boat 56
50 input/output is connected to a buffer transmission control section 75.

The output of the general transmission bucket of the transmission/reception buffer section 43 is connected to the buffer transmission control section 75 . The outputs of the broadcast notification packet sending section 71, the broadcast packet sending section 72, the NAK packet sending section 73, the ACI<bucket sending section 74, and the buffer transmission control section 75 are all connected to the P/S conversion section 2G. .

The operation of the transmission control section having such a configuration will be explained.

The general transmission bucket No. 1 of the transmission/reception buffer section 43 is controlled by the buffer transmission control section 75 by the buffer transmission control signal 85.
Sent from Further, the broadcast notification packet (broadcast notification packet) is sent from the broadcast notification packet sending unit 71 by the broadcast notification packet sending sequence 81 from the input/output boat unit 56 in the processor unit 42. Similarly, the broadcast packet is transmitted from the broadcast bucket sending unit 72 by the broadcast packet sending unit 82 to NΔl
(The packet is NΔ due to NAK packet sending month 83.
■The ΔCK bucket is ΔCK from the bucket sending unit 73.
The packet sending signal 84 causes the CK packet to be sent from the 14th j++ 74.

FIG. 8 is a diagram of )11-char 1 for broadcast transmission according to the present invention. A station that wishes to send a message via broadcast communication sends out a broadcast notification packet via simultaneous broadcast communication. After waiting for a predetermined time, the idle state of the transmission path is monitored, and if there is a station that is still sending out packets on the transmission path, a broadcast notification packet 1- is sent to that station individually. After that, it sends out a broadcast packet and waits for the reception of a NAK packet. NA even after the specified time
If K buckets are not sent, it means that the sending of non-sage is complete. If there is a station that has transmitted a NAK, the same non-sage is individually sent to that station.

FIG. 9 is a flowchart of broadcast reception according to the present invention. Normally, the flag indicating that general packet notes cannot be sent is set to 7-1. When the broadcast packet 1- is received, the general broadcast packet transmission impossible flag is set to 771-. After that, it waits for a certain period of time to receive the simultaneous broadcast Pakenote. If a broadcast packet is received during that time, the general packet transmission disable flag is reset and the broadcast reception ends.

If broadcast buckets 1 to 1 cannot be received even after waiting for a certain period of time, a packet is sent to N8 to the broadcast notification bucket transmission source, and the same message is sent individually. Stations with the general bucket-not-transmission-disabled flag are set to NA
Do not send anything other than K-Pakeno-I. When the broadcast reception is completed, the general packet transmission disable flag is reset, and general packet transmission becomes possible.

[v) Effect of the invention] As explained above, the present invention improves the reliability of broadcast communication by providing a broadcast communication advance notice to the sender and prohibiting general bucket transmission after the broadcast communication advance notice. If the destination does not receive the broadcast packet within a predetermined time, it sends a NAK packet to the source, thereby sending the same message to all stations without sending an ACK bucket. It has an excellent effect of recognizing the arrival of non-sage.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a bucket communication system according to the present invention. FIG. 2 is a block diagram of the node station (1) of the present invention. Figure 3 shows the network control section (11) of the present invention.
Block configuration diagram. FIG. 4 shows a typical formant of the packet frame of the present invention. Figure 5 shows the network control section (11) of the present invention.
FIG. 3 is a block diagram of the control unit (25) of the controller. FIG. 6 shows the reception control section (44) of the control section (25) of the present invention.
Block configuration diagram. FIG. 7 is a block diagram of the transmission control section (45) of the control section of the present invention. FIG. 8 is a flowchart of broadcast transmission according to the present invention. FIG. 9 is a flowchart of broadcast reception according to the present invention. 1... Node station, 2... Transmission line, 3...
・Network interface section, n-J-network control section, 12... host connection section, 13...
- Station post, 21... Node interface section, 22... Receiver section, 23... Decoder section,
24... S/P conversion section, 25... Control section, 26...
・P/S conversion section, 27... Encoder section, 28...
Driver section, 31... Start flag, 32... Destination address field, 33... Source address field, 34... Control field, 35... Data field, 36... FCS
Field, 37... End flag, 41... Reception control unit, 42... Processor unit, 43... Transmission/reception buffer unit, 44... Interface, 51... Broadcast notification packet detection unit, 52 ...Broadcast packet detection unit,
53... NAK bucket detection section, 54... ACK packet detection section, 55... Buffer reception control section, 56.
...I/O port unit, 61...Broadcast notification packet detection signal, 62...Broadcast power detection signal, 63...
・NAK bucket I detection signal, 64... ACK packet detection signal, 65... buffer reception control signal, 71.
...Broadcast notification packet sending unit, 72...Broadcast packet sending unit, 73...NAK packet sending unit, 74...
ACK bucket sending mountain Koriyama section 5...Buffer transmission control unit, 8I...Broadcast notification packet sending signal, 82...Broadcast packet sending signal, 83...NAK packet sending signal, 84...ACK Bucket sending signal, 85...Buffer sending control signal. Patent Applicant NEC Corporation Agent Patent Attorney Naotaka Ide (0) (b) Figure 1 Figure 3 Part 4 RoA 5 Illustration 6 Figure 7 Wing

Claims (1)

[Claims] (1) A transmission path that is commonly used by each information processing device is provided between three or more information processing devices, and a packet signal is transmitted to the transmission path, and one of the information processing devices In a broadcast communication method in which broadcast communication is performed from one information processing device to another information processing device, ``1. Each information processing device performs the other information processing mentioned above immediately before transmitting the broadcast communication. The other information processing device is provided with means for sending a broadcast communication advance notice to the device, and means for prohibiting the transmission of a packet signal to the transmission path when the above-mentioned broadcast communication advance notice is received. , means for transmitting a reception unconfirmed signal to the one information processing device when the broadcast communication from the one information processing device cannot be received even after a predetermined period of time has elapsed after receiving the broadcast communication advance notice; A broadcast communication system using packet communication characterized by comprising: