JPH0442642A - Communication protocol controller - Google Patents

Abstract

PURPOSE:To improve the reliability at the time of communicating by providing part of a processing function of each layer or an additional function to a directory service section so as to prevent a data from being resident in a station when a host layer is in congestion. CONSTITUTION:A directory service section 6 consists of an entry point registration section 1, an error detection section 2 and 1st layer function processing section 3 - n-th layer function processing section 5. When the layer 2 processing section is in congestion, the directory service section 6 uses the error detection section 2 to decide a data error and when the data error is in existence, error check bit information is generated and added to frame information and a retransmission request is sent to a sender. When no data error is detected, a reception command is directly delivered to a layer 3 processing section not through the layer 2 processing section. Thus, even when a host layer is in congestion, the data is not resident thereat and the reliability at the time of communicating data is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication protocol control device that performs communication protocol control in a network.

[Prior Art] This type of conventional communication protocol control device is based on ISO O
It is composed of a multi-layer communication protocol processing structure based on the 8I reference model, and various processing is performed for each layer. However, for urgent data or data that requires real-time performance, there is a problem that there is a large overhead to pass through each layer, or some communication protocol devices in the network do not support all layers. In order to solve this problem, a directory service section is provided that processes identifiers for identifying entry points of each layer, as shown in Fig. 4. There is one as shown in FIG. 5 (for example, Japanese Patent Application Laid-Open No. 64-47154).

In FIG. 4, the communication protocol control unit 7 includes a user interface unit 8. Directory service department6. Layer 7 processing unit 20. Layer 6 processing section 30, layer 5 processing section 40. Layer 4 processing section 50, layer 3 processing section 60. The layer 2 processing section 70 is composed of a transmission/reception control section 80 and a transmission line interface section 90.

As shown in FIG. 5, the directory service unit 6 is composed of a name specified by the user, an identifier corresponding to the name, and an entry point for each layer identified by the identifier. For example, if the user is na
■If e4 (704) is specified, this identifier is id
5, and the layer 5 entry point is acquired. The contents of this directory service section 6 are distributed to all communication protocol control devices on the network.

In FIG. 4, when the user performs transmission using na■e4 (704), the user interface unit 8 that has received the transmission request accesses the directory service unit 6, acquires the identifier id5 based on name4, and
Obtain the layer 5 entry point indicated by . Then, based on the acquired entry point, the user interface section 8 sends a transmission request to the layer 5 processing section 40 via the communication line 500. Further, the layer 5 processing unit 40 that has received this transmission request performs layer 5 protocol processing to generate protocol data and a protocol header, and sends these to the layer 4 processing unit 50 via the communication line 500.
to communicate.

Similarly, the layer 4 processing unit 50. Layer 3 processing unit 60
The layer 2 processing section 70 performs protocol processing, and transmits the transmission request to the next lower layer processing section.

Then, the transmission/reception control unit 80 that receives the transmission request from the layer 2 processing unit 70 via the communication line 500 performs protocol processing to obtain communication rights, and then transmits the user data that has been subjected to the protocol processing by each layer. The signal is sent to the transmission line 100 via the line interface unit 90. In addition, at this time,
An identifier (id5 in this case) is also sent out on the transmission path 100 together with the user data.

When receiving data from another communication protocol control device on the network, the transmission path 100
Data is received from the transmission line interface section 9O. Upon receiving this data, the transmission/reception control unit 80 first accesses the directory service unit 6 via the communication line 400 based on the identifier in the data, and checks whether the layer matches the entry point. In this case, since the identifier is id5, protocol processing is performed and a reception instruction is sent to the layer 2 processing unit 70 via the communication line 500. At this time, the user is notified of the reception of the data via the communication line 500 and the user interface unit 8.

Similarly, layer 2 processing section 70. In the layer 3 processing unit 60 and the layer 4 processing unit 50, the identifier id
5, the directory service unit 6 is accessed via the communication line 400 to confirm the entry point, but since the entry points are different, the reception instruction is transmitted to the next higher layer processing unit after performing protocol processing. .

In this way, the layer 5 processing unit 40, which has received the reception instruction from the layer 4 processing unit 50 via the communication line 500, uses the identifier id
5, the directory service unit 6 is accessed via the communication line 400 and the entry points are compared. In this case, the identifier id5 is the entry point of layer 5, so they match each other, and as a result, the layer 5 processing unit 40 performs the protocol processing of layers 5 and below after performing the protocol processing. The received data is transmitted to the user via the communication line 500 and the user interface unit 8.

In this way, data communication is performed between each communication protocol control device on a conventional network.

[Problems to be Solved by the Invention] In the conventional communication protocol control device described above, when performing data communication, it is possible to control only the lower layer from an arbitrary layer, but the directory service section identifies the entry point of each layer. Therefore, there is a problem in that the overhead of lower layers cannot be reduced by controlling arbitrary layers.

In addition, in conventional communication protocol control devices, the identifier set by the source user is distributed over the network, so if a certain station has higher layers than the value indicated by the above identifier in a state of congestion. In such cases, there was also the problem that data would be delayed at that station.

[Means for Solving the Problems] In order to solve such problems, a communication protocol control device according to the present invention identifies a protocol processing unit of each layer having its own entry point and an entry point of each layer. The directory service section is configured to have a part of the processing function of each layer or an additional function.

[Operation] The directory service section executes some of the processing functions or additional functions of each layer, and as a result, it becomes possible to perform data communication when the upper layer is under high load, and to improve reliability during communication. can.

[Embodiment] Next, the present invention will be explained with reference to the drawings. Fig. 1 is a configuration diagram showing a first embodiment of a communication protocol control device according to the present invention. In the same figure, parts equivalent to the configuration of the conventional communication protocol control device shown in FIGS. 4 and 5 are given the same reference numerals, and the explanation thereof will be omitted.

In FIG. 1, the directory service section 6 includes an entry point registration section 1. It is composed of an error detection section 2 and a first layer function processing section 3 to an nth layer function processing section 5. Note that the entry point registration unit 1 is composed of a name (na e) specified by the user, an identifier corresponding to this name, and an entry point of each layer identified by this identifier, as shown in FIG. .

The operation of the communication protocol control device of the present invention will be described below with reference to FIGS. 4 and 5 of the conventional example.

First, in FIG. 4, the user sends a message to another person on the network using nae4' (704) in the entry point registration section 1 in FIG. 1, where the same content as in FIG. 5 is registered. When receiving data from a communication protocol control device, the transmission/reception control unit 80 that has received the data from the transmission line 100 via the transmission line interface unit 90 first transmits the data via the communication line 400 based on the identifier in the data. to access the directory service section 6 and refer to the entry point registration section l. in this case,
Since the identifier is id5°, protocol processing is performed and the reception instruction is transmitted to the layer 2 processing unit 70 via the communication line 500.

Here, when the layer 2 processing unit 70 is in a congested state, the directory service unit 6 determines a data error in the error detection unit 2, and if there is a data error, adds error detection bit information to the frame information. Created and added,
Send a retransmission request to the sender. Further, if no data error is detected, the reception instruction is directly transmitted to the layer 3 processing unit 60 without going through the layer 2 processing unit 70.

In addition, in the above-mentioned first embodiment, when data is transmitted and received without reducing the layer formed by using the directory service section 6, the directory service section 6 is provided with an error detection function. However, if the directory service unit 6 is equipped with a destination layer format creation unit 2′ that has a function of creating a destination layer format, data can be sent and received in each layer without creating a destination layer format. It also becomes possible. FIG. 2 is a block diagram of a second embodiment including a directory service section 6 and a destination layer format creation section 2'.

Next, a third embodiment of this communication protocol control device will be described based on the flowchart and flag explanatory diagram shown in FIGS. 3(a) and 3(b).

In the first embodiment shown in FIG. 1 above, a case was shown in which the directory service unit 6 performs error detection and then transmits a reception instruction to the layer 3 processing unit 60. Since only detection is required, if processing such as data link control is not required, the operation shown in the flowchart of FIG. As shown in the diagram (b), the transmitted/received data has a processing required layer corresponding flag 9 corresponding to the layer that requires processing.
Set. In this third embodiment, if error detection is performed at layer 2, processing at layers 3 and 4 is not necessary.
Set "1" to 2.5 respectively.

After the processing of layer 1 is completed, the directory service unit 6 refers to the processing necessity flag 9 to determine whether the layer requires processing (step S1), and here the bit corresponding to layer 2 is set to "1". Therefore, the reception instruction is transmitted to the layer 2 processing unit 70, and as a result, this layer 2 protocol processing is executed (step S2>. Then, after the layer 2 processing is completed, the processing of all layers is completed. If the process has not been completed, increment the counter of the next layer to be processed to "3" (step S4), and return to step S1 to see if layer 3 needs to be processed. It is determined whether or not the processing is necessary using the layer correspondence flag 9 (step Sl).

Here, since the bit corresponding to layer 3 is set to "0", it is determined as "N" in step S1, and as a result, the directory service section 6
In step S3), check whether processing of all layers has been completed without issuing a reception instruction to (step S4), and returns to step S1 to determine whether or not layer 4 processing is necessary. When processing of all layers is completed, step S5 starts with processing of the next communication protocol processing device. Processing is executed.

In this way, by executing the process shown in the flowchart of FIG. 3(a), after the layer 2 process is performed, the layer 3. Since the reception instruction can be sent directly to layer 5 without going through layer 4 and the protocol processing can be executed, overhead time is shortened.

As explained above, in the present invention, since the directory service section is provided with an error detection function, it is possible to perform communication regarding emergency data or real-time data regardless of the overhead in the layer below the layer to be accessed. It becomes possible to improve reliability. In addition, even if a layer is in a convergence state, the directory service part handles some of the functional processing of each layer, so data that is stagnant due to convergence can be transferred to the next layer without going through the convergence layer. It becomes possible to communicate with the layer.

[Effects of the Invention] As is clear from the above explanation, in the communication protocol control device according to the present invention, the directory service section executes a part of the processing function of each layer or the processing of the additional function. Even when the data is in a state of contention, the data does not become stagnant there, and the overhead of the lower layer can be reduced, which has the effect of increasing reliability during data communication.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the directory service section of a communication protocol control device according to the present invention, FIG. 2 is a block diagram showing a second embodiment of this device, and the (a) diagram in FIG. FIG. 4 and FIG. 5 are flowcharts and flag explanatory diagrams for explaining a third embodiment of this device, and FIGS. 4 and 5 are configuration diagrams of a conventional communication protocol control device. 1...Entry point registration unit, 2...Error detection unit, 2'...Destination layer format creation unit, 3...First layer processing unit, 4...First layer processing unit 2 layer processing unit, 5... nth layer processing unit, 6...
... Directory service section, 7... Communication protocol control section, 8... User interface section, 20
... Layer 7 processing unit, 30 - Layer 6 processing unit, 40 - Layer 5 processing unit, 50 - Layer 4
Processing unit, 60...Layer 3 processing unit, 70...Layer 2 processing unit, 80...Transmission/reception control unit, 90...-
- Transmission line interface section, 100...transmission line.

Claims (1)

[Scope of Claim] A communication protocol control device comprising a communication protocol processing structure of a plurality of layers, comprising: a protocol processing unit of each layer having its own entry point; and an identifier for identifying the entry point of each layer. The directory service section is provided with a part of the processing function of each layer or an additional function in the directory service section to perform communication during high load of the upper layer, and to improve reliability during communication. A communication protocol control device characterized in that the communication protocol control device is configured to increase the