JPH04162841A - Slot data transmission control system - Google Patents

Abstract

PURPOSE:To attain highly efficient transmission in the case of communication through the use of a high speed LAN by providing a reception control means receiving it as a data addressed to its own station when the data is a data of a slot of a concerned station and a transmission control means sending a transmission data from its own station through notice of an idle slot to the system. CONSTITUTION:A reception control section 12 forms a reception control means which detects an idle state of a slot on a transmission line (LAN) 15 and receives it as a data addressed to its own station when the data is a data of a slot of a concerned station. Moreover, a transmission control section 13 forms a transmission control means which sends a transmission data from its own station by an idle slot notice from the reception control section 12. Then the reception control section 12 and the transmission control section 13 are connected to the transmission line 15 by a connector 16 to make data transmission reception with an external information processing unit. Moreover, the data transmission reception is implemented by the reception control section 12 and the transmission control section 13 via a host layer program 14 and a buffer in a memory. Then highly efficient transmission is attained in the case of communication through the use of a high speed LAN.

Description

[Detailed description of the invention] [Industrial application field] Information exchange (data transmission and reception) between information processing devices according to the present invention
Regarding transmission control methods that can be used in the field of data communication, it is particularly possible to achieve high transmission efficiency when communicating between information processing devices that require high-speed data communication. The present invention relates to a slot data transmission control system that can be used.

[Conventional technology]

The conventional transmission control method is C8, which is used for general 1 communication.
MA/CD (Carri@r 8@Otori@Mtslt
ipl*Access With Co11ision
D*t@etl@m), TDMmu(Tllll@m)
IIHvisjam MalHpl*muee@sa),
) - There is something called the Kunpassing method.

In the C8MA/CD system, before each node transmits data, it checks whether data from other nodes is on the transmission path (LAN) or whether there is a carrier, and depending on the presence or absence of the carrier, transmits its own data. This is a transmission control method that gives priority to pre-emption of the transmission path. Nine, TDMA
The method is a time axis allocation control method that divides the transmission path by time and logically multiplexes the lines. In addition, the token passing method is a method in which access is made through a field having a logical ring-water network configuration, and the right to transmit data can be obtained by acquiring a transmission signal called a token.

[Problem to be solved by the invention]

In this conventional 08M/CD system, data is transmitted after confirming the 9 signals on the transmission path, which causes collisions with data from other stations. There is a problem in that the holding time due to retransmission of the ninth data becomes longer as the traffic on the transmission line increases. 9. fiC8 due to TDMA system expansion
Unlike the MMU/CD system, there is no monitoring of free status on the transmission path or data collision, but because the transmission path is time-divided, many stations (nodes) are connected on the same line, ,
Another problem is that it is difficult to obtain effective data transmission efficiency when each station does not use it all the time. In addition, in the token passing method, data collisions do not occur because the token maintains intentionality, but there is a problem in that the holding time for waiting for the token increases.

Conventional transmission control methods such as C8MAjCD, TDM, and token passing, which are typified by access control, have problems such as an increase in the data collision rate and a decrease in network efficiency ( Since the maximum propagation time (maximum propagation time - average holding time)/maximum propagation time decreases, the invalid time between transmitted data increases, resulting in a problem in that the transmission efficiency does not improve.

[Ninth means to solve the problem]

The slot data transmission control method of the present invention is a data transmission control method between information processing devices that detects the empty state of a slot on a transmission path, and if the data is in a slot of a corresponding station, it is received as data addressed to the own station. It is equipped with a control means and a transmission control means for transmitting transmission data from its own station in response to an empty slot notification from the receiver 1 control means, enabling highly efficient transmission when communicating using a high-speed LAN. It is something to do.

[Effect]

In the present invention, regarding data transmission control between information processing apparatuses, highly efficient transmission is enabled when communication is performed using high-speed communication using a reception control means and a transmission control means.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, 11 parts related to the slot data transmission control method of the present invention are shown.
5 detects the static state of the slot above, and if the data is in the slot of the corresponding station, it is received as data addressed to the own station.

Reference numeral 13 denotes a transmission control section, and the transmission control section 13 constitutes a transmission control means for transmitting transmission data from its own station in response to an empty slot notification from the reception control means. 14 is an upper layer program, and 16 is a connector.

In this way, the slot data transmission control method of the present invention
It is composed of a reception control section 12 and a transmission control section 13, and the reception control section 12 and transmission control section 13 are connected by a transmission path ISK connector 1@, and perform data transmission and reception with an external information processing device. 9. Reception control section 12 and transmission control section 13
Data is exchanged with the upper layer program 14 by transmitting and receiving data via a buffer in the memory.

The device is configured to enable highly efficient transmission when communicating using a high-speed door.

FIG. 2 is a structural diagram of a slot, and 17 indicates a slot.

FIG. 3 is a flowchart for explaining the operation of FIG.
In each step 101 to 109, a predetermined process is executed.

The fs4 diagram is a block diagram showing an example of the configuration of -.

In this Figure 4, the parts corresponding to Monomori are shown with the same symbols as in Figure @1, and 1@a, 1! ib, 1@@ are connectors, 1s Hiro terminal, 1st, Ilb, 11* are transmitting/receiving stations.

FIG. 5 is a data flow diagram showing the DT polishing time.

Next, the operation of the embodiment shown in the f/s1 diagram will be explained with reference to FIGS. 2 to 5.

First, the slot structure on the transmission path handled by the slot data transmission control system of the present invention will be explained using JI2glK.

This switch is similar to the 7-frame structure of the C8M/CD system, but it has a 9-frame structure with the slot status added to a precise delimiter section for detecting the slot start. This slot is an n-octet synchronization bit pattern called a trailer, which brings the signal circuit of the control mechanism into a stable state.

Then, in the next one-octet area called slot status/delimiter, a bit pattern indicating the presence or absence of a slot or the start of a slot is set. This is set when the line scrap address has a slot status in an area of 2t or 6 octets (whichever is fixed depending on the LAN) called the next destination address. Also, based on this address, the receiving station determines whether the address is addressed to its own station.

The second address, called the next source address, is 6 octets (
(either one is fixed depending on LIAN) In the O area, the station address is set when the slot status is present. This address is used by the upper layer program 14 to know the destination station.

Next, the length information is a 2-octet bit string, and the octet value of valid data to be set in the subsequent slot data is set. A received data string or a transmitted data string is set in the next data section, and a data area size determined in advance by the slot size is fixedly allocated. Therefore, the effective data length within the allocated data area is determined by the previous length information. Finally, the slot check sequence (CRC: Cy*11eR
@dmmdam@h Ch@ck) is set by a 4-octet bit string. This slot check sequence is used as information to detect bit alterations in the slot.

Next, referring to FIG. 3) the reception control section 12 and the transmission control section 130
The $1111 process 7a- will be explained. First, the reception control unit 12 detects a trailer and determines the slot synchronization timing (step 101), and stabilizes the operation of the internal O control circuit. Next, in step 102, the slot status/delimiter is checked to determine whether the subsequent slot data is valid or invalid (empty slot).

After the determination, if there are many slots, it is checked whether the next destination address is the address addressed to the local station (step 103), and if it matches the local address, the destination address, length is , the data information is received (Step 104), the last CRC is checked (Step 105), and the received data (Bazza internal data) is passed to the upper layer program 14 (Step 10).
6). Next, the process returns to the trailer detection process again. At this time, if the slot status is empty, the controller 13 notifies the roar transmission control unit 13 that transmission is possible, and similarly returns to the trailer detection process. Furthermore, if the own station address and the destination address do not match, subsequent slot reception is interrupted and the process returns to the trailer detection process again.

Next, the transmission control unit 13 transfers the data received from the upper layer program 14 via the buffer to the reception control unit 13.
Waiting for the empty slot notification detected in step 2, the bit string already assembled into the slot structure (with the slot status set to "enabled") is output as transmission path ISK transmission data (steps 107 to 109).

Next, the process of data transmission using this slot data transmission control system will be explained from an example of an actual closing configuration using FIG. 4. This configuration results in a data flow as shown in FIG.

Station a1gm and station @11e of transmitting/receiving station 1s shown in Figure 114
This is an example in which the station b11b transmits data during data communication between the two stations. Even if station b 111b transmits when station a IIm transmits and station @1h receives, data collision will not occur because data is transmitted and received in slot units. Also, each slot is used by a transmitting station to find an empty slot and send data to the corresponding slot.
Data communication becomes possible without making the upper layer program 14 wait an invalid hold time like the rDMA method.

Therefore, high speed 1. In the AN, this slotted data transmission control system enables data transmission without reducing network efficiency.

[Invention O effect]

As explained above, the present invention provides a reception control means and a transmission control means that enable highly efficient transmission when communicating using data transmission control KIIL and high speed N between information processing devices. , to achieve higher transmission efficiency than conventional transmission control methods even in LANs with ultra-high line speeds, without reducing data transmission efficiency even with conventional transmission speeds. It has the effect of

[Brief explanation of drawings]

Fig. m1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a slot O structure diagram, and Fig. 3 is a holder F1 used to explain the operation of the first wA. The block diagram shown in FIG. j15 is a data flow diagram on W. 11...Slot data transmission control method, 12...
・Reception control unit, 13...Transmission control unit, 14...Fist・
Upper layer program, 15...transmission line (LAN)
, 1 @ , 16m 〒-? @e・・・Connector,
17 pot threat / reference slot, 18φ -- terminator, 1lla
~1ie-Φ... Transmitting/receiving station. Patent issued by NEC Co., Ltd.

Claims (1)

[Claims] In a data transmission control system between information processing devices, a reception control means detects the vacant state of a slot on a transmission path and receives data in a slot of a corresponding station as data addressed to the own station, and a reception control means that receives data transmitted from the own station. A slot data transmission control method characterized by comprising a transmission control means for transmitting the data in response to an empty slot notification from the reception control means, so that highly efficient transmission can be performed when communicating using a high-speed LAN. .