JPS62283749A - Transmission method for picture information - Google Patents

Abstract

PURPOSE:To improve the effective transmission efficiency of picture information by constituting the titled method so that the data connecting means of a short pass interface layer for allowing the picture information to pass through without processing it outputs the picture information processed by the data processing means of an application layer, to the data processing means of a prescribed layer. CONSTITUTION:In node stations 11, 13 of transmitting/receiving stations, by processing an image data through short pass interface layers 11h, 13h, a processing time in the node station of the transmitting station and the node station of the receiving station can be shortened, comparing with the transmission of an image data of a conventional example which follows a protocol of open systems interconnection (OSI) reference model 7 story layers. Also, a header added to a data which is transmitted between the node stations can be decreased. In such way, the effective transmission efficiency of a data on a transmission line can be raised.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a method for transmitting image information.

[Prior Art] Since image communication handles visual information as it is, it is easy to operate, easy to understand, and has excellent human interface, and expectations for its development are increasing year by year. Furthermore, the digitalization and broadbandization of networks in NS will enable the development of even more diverse and sophisticated services, and is expected to play an important role as the core of future non-telephone services.

On the other hand, the standardization of each layer is progressing, including the standardization trend in local area networks (hereinafter referred to as LAN).
Even basic concepts such as file transfer and job transfer operations are being solidified. Furthermore, with the emergence of new information processing equipment such as electronic files and workstations that no longer require high-speed image communication, the development of LANs that focus on image communication is awaited.

Table 1 is a seven-layer protocol specified by the International Organization for Standardization (hereinafter referred to as ISO) for data communication, and is generally used in OS I (Open Systems
terconnect 1on) is called a reference model. In a system that follows this O8I reference model,
Information is transmitted in the data format shown in FIG. 4, and the transmitting station and receiving station are provided with software, firmware, and hardware for executing each protocol of the O8 reference model.

As shown in Table 1, Figure 4, at the transmitting station, after the data 31 of information to be transmitted is created according to the protocols of the abstraction layer and the presentation layer, the data 31 of the information to be transmitted is created according to the protocol of the session layer. 32a is added to the data 31 to create session layer data 32. After that, a transport level header 33a is added to the data 32 according to the transport layer protocol, and after transport layer data 33 is created, a network level header 34a is added to the data 32 according to the network layer protocol. 33 and network layer data 31
t is created.

Further, a data link level header 35a is added to the upper data 34 according to the data link layer protocol, creating data link layer data 35, and this data 35 is attached to the interface device and transmission media specified in the physical layer. The signal is then transmitted to the receiving station. At the receiving station, the data link level header 35a and network level header 34 added at the transmitting station are
The a1 transport level header 33a and the session level header 32a are sequentially removed to obtain data 31 of the information transmitted by the transmitting station. On the other hand, each header 35a, 34a, 33a, and 32a is used as control information at the receiving station.

[Problem to be solved by the invention] However, in a system that faithfully adheres to the general OSI reference model surface hierarchy protocol shown in Table 1, compared to the data 31 to be transmitted, the data added at each layer is The headers 32a, 33a, 34a, and 35a become larger, and the effective transmission efficiency of data actually sent onto the transmission path decreases.

Additionally, due to the multi-layered processing at the transmitter/receiver station, there is a problem in that the data processing time at the transmitter/receiver station becomes extremely long.

[Object of the Invention] An object of the present invention is to transmit image information according to the protocol of the 7th layer of the O9I reference model, and to reduce the data processing time of transmitting and receiving stations compared to conventional methods when transmitting image information between specific stations. An object of the present invention is to provide a method for transmitting image information that can be shortened compared to the above method and can improve the effective transmission efficiency of the data sent on an actual transmission path.

[Structure of the Invention] The present invention provides an application layer data processing means, a presentation layer data processing means, a session layer data processing means, and The image information to be transmitted is processed by the data processing means of the transport layer, the data processing means of the network layer, the data processing means of the data link layer, and the data connection means of the physical layer, and is transmitted from the transmitting station to the receiving station. In the image information transmission method, in the transmitting station, after the image information is processed by the data processing means of the application layer, the data processing means of the presentation layer, the data processing means of the session layer, and the transport 1 layer are processed. and a data connection means of a short path interface layer that allows the image information to pass through without being processed in at least one of the data processing means of the network layer, which is processed by the data processing means of the application layer. The image information is output to data processing means of a predetermined layer.

[Embodiment] FIG. 2 is a diagram showing a layered structure of a protocol that is an embodiment of the image information transmission method of the present invention.

In the hierarchical structure shown in Figure 2, [SO
O3 [has seven layers of reference models and has a Noyotopath interface layer that is directly connected from the application layer to the data link layer.

FIG. 1 is a block diagram that does not show the system of a LAN that is an embodiment of the present invention. In Figure 1, 1.2 and 3
is L A N, and LANI is 4 node stations + 1
．． 12.13 and 14 and their node stations 11.12
．． 13 and 14, and a relay node station 16 for communicating with each of the relay node stations 17 and 18 of the pond's LANs 2 and 3.

The LANI node station 11 includes data processing devices 11a, 11b, 11c, and 11a for transmitting and receiving image data corresponding to each protocol layer shown in FIG.
Id, Ile, IIf, Ig, and Ilh are provided, and each device is realized by software, firmware, and hardware.

Also connected to the node station 11 are three image terminal devices 21, 22 and 23 that perform processes such as creating and displaying image data. The operation of each of these devices will be described in detail later.

Node stations 12.13 and I4 are configured similarly to node station 1.1 and are connected to coaxial cable 15,
2.13 and 14 are image terminal devices 24 and 2, respectively.
5, image terminal devices 26 and 2-7, and image terminal devices 28 and 29.

Note that the node stations 12 and 14 are connected to the node station 11.
rZ j-), /y-+ -- 昭,, n; hbn
mttA! Does not include 1411h.

The relay node station 16 includes each data processing device 11a, l of the physical layer, data link layer, and network layer of the node station+1.
It is equipped with equipment with the same configuration as lb and llc, and LA
It is connected to the coaxial cable 15 of NI, and is also connected to the relay node station 17 of LAN2 and the relay node station 18 of LAN3 via wireless transmission lines 24a and 24b.

LAN2 and LAN3 should be configured similarly to LANI.

An example of operation when configured as above is shown in Figure 1.
This will be explained below with reference to FIGS. 3 and 4. First, for example, from node station It in L A N l to node station 1
For example, when image data is transmitted to node station 1
After image data is created in the image terminal device 22 of Node 1, the image data is output to the data processing device 11g of the application layer for high-speed image communication of node station 1. The application layer data processing device 11g performs predetermined data processing on the input image data according to the application layer protocol, and then transfers the processed image data to the presentation layer data processing device IIr.
Output to. Presentation layer data processing device 1
1f performs predetermined data processing such as data format, code, expression conversion, and encryption on the input image data based on the presentation layer protocol, and then transfers the image data 31 to the session layer data processing device 11.
Output to e.

Next, the session layer data processing device lie converts the input image data 31 into a session level header containing control information such as interaction between terminals, data segmentation, buffering, etc., as shown in FIG. 32a is added to create data 32, and output to the data processing device 11d of the transport layer. The data processing device ttd of the transport layer adds a transport level header 33a to the input data 32, which includes control information such as control between terminals, disassembly and assembly of additional messages, priority of transmission of image information, etc. Then, data 33 is created and output to the data processing device 11c of the network layer. The network layer data processing device 11c adds a network level header 34a containing information such as network management, information block and packet configuration, and message format to the input data 33 to create data 34. , and output to the data processing device zb of the data link layer.

The data processing device 11b of the data link layer converts the input data 34 into a data link header 3 containing information such as data flow initialization, control, stop, and error recovery.
5a to create data 35, and send the data 35 to the node station via the physical layer data connection device 11a, which is an electrical and mechanical interface, the coaxial cable 15, and the physical layer data connection device 12a of the node station 12. It is output to the data processing device 12b of the data link layer of I2.

Furthermore, in the node station 12 which is the receiving station, first, the data processing device of the data link layer! 2b removes the data link level header 35a from the received data 35 to extract the data 34, performs predetermined processing on the above information included in the data link level header 35a, and extracts the data 34. The data is output to the network layer data processing device 12C. Similarly, data processing opposite to the data processing in the node station 2 which is the transmitting station is performed, including the network layer data processing device 12C, transport layer data processing device 12d, session layer data processing device 12e, For example, the image terminal device 24
The image data sent from the image terminal device 22 of node station II is output.

The transmission of image data described above is transmission according to the protocol of the ISO OSf reference model. For example, when transmitting image data from the node station 11 to the node station 13, the following procedure is performed.

First, the data processing devices 11g and 13g of each application layer of the node stations 11 and 13 connect by transmitting information through the seven layers of the O9I reference model described above, and the data processing devices 11g and 13g of each application layer of the node stations 11 and 13 Short bus・
Interface layer data connection devices 11h and 13h
Check the transmission of image data via. Next, for example, after image data is created in the image terminal device 22 of the node station 11, the image data is transferred to the high speed 1! ? ! It is output to the data processing device 11g of the communication application layer.

The application layer data processing device 11g performs predetermined data processing on the input image data according to the application layer protocol, and then transfers the processed image data 36 to the short path interface layer data, as shown in FIG. It is output to the data processing device 11b of the data link layer via the connection device 11h.

The data connection device zh of the Nyoto path interface layer is a through link that connects the data processing device 11b of the data link layer and the data processing device 11g of the application layer, and has zt, q + Ik17.7.
i'l 1. vrll1M/-, h-1inch? It is provided for totaling.

The data processing device zb of the data link layer converts the input image data 36 into a data link header 3 containing information such as data flow initialization, control, stop, and error recovery.
7a is added to create data 37, and the data 37 is transferred to the data link layer data of the node station I3 via the physical layer data connection device 11a, the coaxial cable 15, and the physical layer data connection device 13a of the node station 13. Processing device 13b
Output to.

Furthermore, in the node station 13 which is the receiving station, the data link layer data processing device 13b removes the data link level header 37a from the received data 37 and extracts the data 36. Then, while performing predetermined processing on the above information included in the data link level header 37a, the data 36 is transferred to the data of the application layer for high-speed image communication via the data connection device 13h of the short path interface layer. Processing bag R
Output to 13g. The application layer data processing device 13g performs predetermined processing on the received data 36, and then outputs the image data to, for example, the image terminal device 26.

As described above, by processing the image data via the short path interface layer at the transmitter/receiver node, it is possible to improve the image data transmission in the conventional example that follows the protocol of the 7th layer of the O8I reference model. , it is possible to shorten the processing time at the node station of the transmitting station and the node station of the receiving station, and it is also possible to reduce the number of headers added to the data to be transmitted between the node stations, so that the data on the transmission path is reduced. Effective transmission efficiency can be increased.

Therefore, large amounts of image data can be sent between each image terminal device at high speed, so in a network such as the LAN system of the embodiment, it is possible to transfer images between terminals such as electronic files and workstations. Become.

In the LAN system shown in FIG. 1, not only between each node station within LAN1, but also between relay node stations
and 18, image data can be transmitted with other node stations of LANs 2 and 3.

In the protocol layered structure shown in Figure 2, a shortpath interface layer is provided, so protocols that are determined in layers higher than the data link layer, such as the number of retransmissions, are all handled by specific stations that have a shortpath interface layer. Since the protocol can be negotiated between the application layers of h'4, it is possible to establish a protocol according to the application of the image data.

In the protocol hierarchy shown in Figure 2 applied to the LAN system shown in Figure 1, a short path interface is located between the data link layer and the application layer. It may also be used as a through link that separates at least one of the transport layer, session layer, and presentation layer.

[Effects of the Invention] As detailed above, according to the present invention, at the transmitting station,
After the image information to be transmitted is processed by the data processing means of the application layer based on the protocol of the O9I reference model specified by ISO, the data processing means of the presentation layer and the data processing means of the Sesong Yong layer are respectively based on the OSI reference model. The data connection means of the application layer passes the image information without processing it in at least one of the data processing means of the transport layer and the data processing means of the network layer. Since the image information processed by the means is outputted to the data processing means of a predetermined layer, it is possible to shorten the processing time of image information at the transmitting station and the receiving station, and it is possible to reduce the time required for processing the image information between the transmitting stations. This has the advantage that the effective transmission efficiency of image information can be increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a LAN system showing an embodiment of the image information transmission method of the present invention, and FIG. 2 is a diagram showing a protocol layer structure that is an embodiment of the image information transmission method of the present invention. Fig. 3 is a diagram showing the data format when image data is transmitted via the short path interface layer in the LAN system shown in Fig. 1, and Fig. 4 shows the ISO format in the conventional example and the LAN system shown in Fig. 1. FIG. 2 is a diagram showing a data format of image data transmitted according to a seven-layer protocol of the SIO reference model of FIG. 1.2.3... Local area network (L
AN), 11.12, 13.14... node station, 11a,
l2a, l3a, l4a...physical layer data connection device, 11b, 12b, 13b, 14b...data link layer data processing device, 11c, l2c, 13c, l4cm network layer data processing Apparatus, 11d, l2d, l3d, 14d...
・Transport layer data processing device, 11e, l2e, l3e, I4a-
---Session layer data processing device, lIf, l2r, 13r, 14f--
・Presentee'/A layer data processing device, 11g, 12g, 13g, 14g...Application layer data processing device for high-speed image communication, 1
1h, I3h... data connection device of the digital path interface layer, I5... coaxial cable.

Claims (1)

[Claims] (1) 7 of the OSI reference model specified by the International Organization for Standardization
Data processing means of the application layer, data processing means of the presentation layer, data processing means of the session layer, data processing means of the transport layer, data processing means of the network layer, and data link layer according to each protocol of the layer. and an image information transmission method in which the image information to be transmitted is processed by the data connection means of the physical layer and transmitted from the transmitting station to the receiving station, the data processing means of the application layer processing the above information at the transmitting station. After processing the image information, in at least one of the data processing means of the presentation layer, the data processing means of the session layer, the data processing means of the transport layer, and the data processing means of the network layer, An image characterized in that the data connection means of the short path interface layer that allows image information to pass through without being processed outputs the image information processed by the data processing means of the application layer to the data processing means of a predetermined layer. How information is transmitted.