JPH08195783A - Multi-layer protocol processing method and its device - Google Patents

Abstract

PURPOSE: To make a processing unit small and to attain a high processing speed. CONSTITUTION: A common processing section 1 conducts assembling, deassembling and error check of a protocol header and a message in common to each layer in a reception or transmission message and generates error check information and hierarchical individual processing sections 3A-3C provided to each layer check a sequence of the protocol header for each layer in a reception message and generates the protocol header by layers in the transmission message. Then a protocol layer changeover section 2 applies sequential changeover connection of the hierarchical individual processing sections 3A-3C to the common processing section 1. Thus, transmission reception quantity of data between the processing sections is reduced more than those of a conventional method and high speed processing is realized and the processing unit is made small as a whole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer protocol processing method and apparatus applicable to the configuration of a communication control unit in a communication apparatus for performing information communication using a communication protocol having a hierarchical structure.

[0002]

2. Description of the Related Art Conventionally, processing of a communication protocol having a hierarchical structure has a processing mechanism for each layer, and each processing mechanism realizes the protocol processing of each layer.

FIG. 2 shows a conventional communication protocol processing mechanism having a hierarchical structure, and FIG. 3 shows a message frame structure of a multi-layer protocol.

FIG. 1 shows an outline of a communication protocol processing device having a hierarchical structure of N layers, and each hierarchical processing unit 2
The reception processing units 22 of 1-1 to 21-N perform decomposition of received messages, error check, and protocol sequence check, and the transmission processing unit 23 assembles transmission messages and adds error check information.

When the received message RM is received from an external device (not shown), the N layer processing unit 21-1 performs the receiving process in the reception processing unit 22, and then the N-1 layer processing unit 21-.
In step 2, the Nth layer reception protocol data unit (Protocol Data Unit: hereinafter referred to as PDU) in the reception message RM is transmitted. The N-1 hierarchical processing unit 21-2 is N-
After the reception processing unit 22 of the first layer performs the reception process, the reception PDU of the N-1 layer in the reception message is transmitted to the higher layer processing unit 21. Similarly, the uppermost hierarchical processing unit 21-N performs the receiving process of the received message received from the next lower hierarchical processing unit 21 in the reception processing unit 22 to acquire the reception data RD.

On the other hand, the highest layer processing unit 21-N which has received the transmission data SD creates a lower layer transmission PDU by the transmission processing unit 23 using the transmission data SD input from the transmission source, and the lower layer. It is transmitted to the processing unit 21.

In the transmission processing unit 23 of the lower layer processing unit 21, a transmission frame is constructed from the protocol header and the transmission PDU received from the upper layer processing unit 21, error check information is added, and as a lower transmission PDU, It is transmitted to the lower layer processing unit 21.

In this way, the N-1 hierarchical processing section 21-2
Then, the transmission PDU received from the upper layer processing unit 21 is N-
Incorporated into 1-layer transmission frame, N-1 layer transmission PD
As U, the transmission PDU is transmitted to the N-layer processing unit 21-1, and the final transmission message SM is sent out by the N-layer processing unit 21-1.

[0009]

However, since the above-mentioned conventional technique has a processing mechanism for transmitting and receiving PDUs between independent hierarchical processing units, processing for transmitting and receiving PDUs, processing for disassembling or assembling PDUs is performed. Therefore, it is difficult to reduce the size of the processing device and increase the processing speed.

In view of the above problems, it is an object of the present invention to provide a multi-layer protocol processing method and a device thereof which can reduce the size of the processing device and increase the processing speed.

[0011]

In order to achieve the above-mentioned object, the present invention provides a multi-layer protocol processing method for processing a communication protocol having a hierarchical structure according to claim 1, in which a common message is received by a common processing unit. By separating the protocol header and the protocol data unit for each layer and performing an error check, and performing the sequence check of the separated protocol header in the layer individual processing unit provided for each layer, the received data is acquired in the common processing unit. , Creating protocol header data for each layer to be added to transmission data in the layer individual processing unit, adding the created protocol header data to the transmission data in the common processing unit, and creating error check information Create and send message It proposes a multi-layer protocol processing how.

According to a second aspect of the present invention, in a multi-layer protocol processing device for processing a communication protocol having a hierarchical structure, a protocol header common to each layer in a received or transmitted message and message assembly, disassembly, error check and error check information. And a plurality of layer individual processing units for performing a sequence check of layer-specific protocol headers in a received message and a layer-specific protocol header in a transmitted message, and a plurality of layer processing units for the common processing unit. We propose a multi-layer protocol processing device that includes a protocol layer switching unit that sequentially switches and connects the layer individual processing units.

[0013]

According to the first aspect of the present invention, the received message is separated into the protocol header and the protocol data unit and the error check is performed for each layer in the common processing unit. Further, a sequence check of the separated protocol header is performed in a layer individual processing unit provided for each layer. As a result, the reception data is acquired by the common processing unit. Further, protocol header data for each layer that is added to the transmission data is created in the layer individual processing unit, and the created protocol header data is added to the transmission data in the common processing unit and an error check is performed. The information is created and given, and the outgoing message is created.

Further, according to claim 2, the common processing unit performs the decomposition of the protocol header and the message common to each layer in the received message and the error check, and also performs a plurality of layer individual processing for the common processing unit. The units are sequentially switched and connected by the protocol layer switching unit, the sequence check of the protocol header for each layer in the received message is performed in the layer individual processing unit, and the received data is acquired in the common processing unit. In addition, the layer individual processing unit creates a protocol header for each layer in a transmission message, and the plurality of layer individual processing units are sequentially switched and connected to the common processing unit by a protocol layer switching unit. Thus, the protocol header is added to the transmission data, the protocol header common to each layer in the transmission message, the message is assembled, and the error check information is created, and the transmission message is created.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
In this embodiment, a configuration example of a multi-layer protocol processing device that processes a communication protocol having a hierarchical structure of three layers will be shown. In the figure, 1 is a common processing unit having a protocol layer counter 1a, 2 is a protocol layer switching unit, and 3A-3
Each of C is a first to third layer individual processing unit. The individual layer processing units 3A to 3C include the protocol layer switching unit 2
It is configured to be connectable to the common processing unit 1 via.

The common processing unit 1 performs error checking of the received message, disassembly and assembly of the protocol header and PDU in the received message, and creation and addition of error check information.

The layer individual processing units 3A to 3C check protocol sequences and manage timers and are prepared for each protocol layer. The protocol layer switching unit 2 controls the connection between the common processing unit 1 and the layer individual processing units 3A to 3C. .

The first signal line SL1 is used for receiving a message to the common processing unit 1, and the second signal line SL2 is used for transmitting header data from the common processing unit 1 to the hierarchical individual processing units 3A to 3C. The three signal lines SL3 are the layer individual processing units 3A-
3C to the common processing unit 1 for the header data transmission, the fourth signal line SL4 for the reception data transmission, the fifth signal line SL5 for the transmission data reception, the sixth signal line SL6 for the common processing unit 1
Used to send messages from each.

Further, the control signal line CL transmits the count value of the protocol layer counter 1a from the common processing unit 1 to the protocol layer switching unit 2 and is used by the common processing unit 1 to control the protocol layer switching unit 2. .

Next, the operation of this embodiment having the above construction will be described. In the initial state, the protocol layer switching unit 2 selects the lowest layer first layer individual processing unit 3A and connects it to the common processing unit 1. When a received message is input from the external device to the common processing unit 1 via the first signal line SL1, the common processing unit 1 performs error checking of the received message according to the value indicated by the protocol layer counter 1a, and the received message is received. Is separated into a protocol header and a PDU, and the data of the separated protocol header is sent to the first layer individual processing section 3A via the second signal line SL2 and the protocol layer switching section 2.

Upon receiving the protocol header data from the common processing unit 1, the first layer individual processing unit 3A checks the protocol sequence, sets the timer, creates the protocol header data to be returned as a response, and switches the protocol layers. The created protocol header data is sent to the common processing unit 1 via the unit 2 and the third signal line SL3.

The common processing unit 1 sets the protocol header data in the transmission message frame and increments the value of the protocol layer counter 1a by one.

As a result, the protocol layer switching unit 2
Based on the count value of the protocol layer counter 1a included in the control signal sent from the common processing unit 1 via the control signal line CL, the layer individual processing units 3A to 3C connected to the common processing unit 1 are set to the second layer. Switch to the individual processing unit 3B.

After that, the common processing unit 1 separates the separated PDU.
The received message is subjected to error check, the received message is separated into a protocol header and a PDU, and the second
The protocol header data is sent to the second layer individual processing section 3B connected via the signal line SL2.

Upon receiving the protocol header data from the common processing unit 1, the second layer individual processing unit 3B checks the protocol sequence, sets the timer, and then creates the protocol header data to be returned as a response, and outputs the second signal. Second layer individual processing unit 3 connected via line SL2
Send protocol header data to B.

The second layer individual processing section 3B checks the protocol sequence, sets the timer, creates the protocol header data to be returned as a response, and sends it to the common processing section 1 via the third signal line SL3.

The common processing unit 1 sets the protocol header data in the transmission message frame and increments the value of the protocol layer counter 1a by one.

As a result, the protocol layer switching unit 2
Based on the count value of the protocol layer counter 1a included in the control signal sent from the common processing unit 1 via the control signal line CL, the layer individual processing units 3A to 3C connected to the common processing unit 1 are connected to the third layer. Switch to the individual processing unit 3C.

The common processing unit 1 performs an error check using the separated PDU as a received message, separates this received message into a protocol header and a PDU, and outputs the second signal line S.
The protocol header data is sent to the third layer individual processing unit 3C connected via L2.

The third layer individual processing section 3C checks the protocol sequence in the received protocol header, sets the timer, creates the protocol header data to be returned as a response, and performs the common processing via the third signal line SL3. Send to Part 1.

The common processing unit 1 sets the protocol header data in the transmission message frame and increments the value of the protocol layer counter 1a by one.

As a result, the protocol layer switching unit 2
The third processing unit 1 connected to the common processing unit 1 based on the count value of the protocol layer counter 1a included in the control signal sent from the common processing unit 1 via the control signal line CL.
The individual layer processing unit 3C is separated.

After that, the common processing unit 1 separates the separated PDU.
Is sent as received data to the data receiving destination via the fourth signal line SL4.

On the other hand, when the data is transmitted from the data transmission source to the external device, the common processing section 1 uses the fifth signal line S.
The transmission data sent from the data transmission source is received via L5, the transmission data is set as a PDU in the transmission message, error check information is created, and the error check information is added to the transmission message. Decrement the value of 1a by 1.

As a result, the protocol layer switching unit 2
The third layer individual processing unit 3C is connected to the common processing unit 1 based on the count value of the protocol layer counter 1a included in the control signal sent from the common processing unit 1 via the control signal line CL. Third connected to common processing unit 1
The layer-specific processing unit 3C activates the timer function, and if there is a process to be performed at every predetermined time, the process is performed based on the timing of the timer.

The common processing unit 1 creates error information of a message portion corresponding to a protocol layer which is one less than the count value of the protocol layer counter 1a, and decrements the value of the protocol layer counter 1a by 1 in addition to the transmitted message.

As a result, the protocol layer switching unit 2
Based on the count value of the protocol layer counter 1a included in the control signal sent from the common processing unit 1 via the control signal line CL, the layer individual processing units 3A to 3C connected to the common processing unit 1 are set to the second layer. Switch to the individual processing unit 3B. Second layer individual processing section 3B connected to common processing section 1
Activates the timer function, and if there is a process to be performed at predetermined time intervals, the process is performed based on the timing of the timer.

Next, the common processing unit 1 creates error information of the message portion corresponding to the protocol layer, which is one less than the protocol layer counter value, and decrements the value of the protocol layer counter 1a by one in addition to the transmitted message.

As a result, the protocol layer switching unit 2
Based on the count value of the protocol layer counter 1a included in the control signal sent from the common processing unit 1 via the control signal line CL, the layer individual processing units 3A to 3C connected to the common processing unit 1 are set to the first layer. Switch to the individual processing unit 3A. First layer individual processing unit 3A connected to common processing unit 1
Activates the timer function, and if there is a process to be performed at predetermined time intervals, the process is performed based on the timing of the timer.

After that, when the count value of the protocol layer counter 1a becomes 1, the common processing unit 1 sends the created transmission message to the external device via the sixth signal line SL6.

FIG. 4 is a diagram showing a process of generating a transmission message in the above embodiment. That is, as described above, the first layer protocol header, the second layer protocol header,
The third layer protocol header, transmission data, third layer error check information, second layer error check information, and first layer error check information are set in the transmission frame in the order of description, and a transmission message is created by this. .

According to the above-described embodiment, the common processing unit 1 performs error processing common to each layer, message disassembly / assembly, and protocol sequence check and protocol header data creation for each layer. It is performed by the provided layer individual processing units 3A to 3C, and the protocol layer switching unit 2 connects the corresponding layer individual processing units 3A to 3C and the common processing unit 1 for each layer to be processed, thereby performing the multi-layer protocol Since the processing of each layer is performed by one common processing unit 1, it is possible to reduce the data movement processing between the processing units, and it is possible to reduce the size of the processing mechanism and increase the processing speed.

In the present embodiment, a configuration example of a multi-layer protocol processing device having three layers has been shown, but the present invention is not limited to this and has a hierarchical structure of two layers or less or four layers or more. It is also possible to configure a processing device that processes a communication protocol, and the same effect can be achieved by this.

When the common processing unit 1, the protocol layer switching unit 2, and the layer individual processing units 3A to 3C are configured by a program using an object-oriented programming language, the common processing unit is created as a super class. At the same time, the function is created as a method of the common processing part, the method name of the hierarchical individual processing function is also defined in the superclass, and the method corresponding to the individual processing is described in the subclass. As a result, all the common functions are shared by the processing by layer, and the individual processing functions of different layers can be called by the same method name.

[0045]

As described above, according to the multi-layer protocol processing method of the first aspect of the present invention, in the process of creating a transmission message from transmission data, the data is collected in the common processing unit, so that the processing units are not processed. Since the amount of data transmitted and received is reduced as compared with the conventional method, the processing speed can be increased. Furthermore, since the common processing unit performs all the assembling of the transmission message and the disassembling of the reception message, the configuration of each layer individual processing unit can be downsized as compared with the conventional technique.

Further, according to the multi-layer protocol processing device of the second aspect, in the process of creating the transmission message from the transmission data, the processing common to each layer is performed by the common processing unit. Since the amount of data transmitted and received is reduced as compared to the conventional case, the processing speed can be increased. Further, since the common message processing unit assembles the transmitted message and decomposes the received message, it is possible to downsize the configuration of each layer individual processing unit, and it is possible to downsize the processing device as a whole.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a processing mechanism of a conventional communication protocol having a hierarchical structure.

FIG. 3 is a diagram showing a message frame structure of a multi-layer protocol.

FIG. 4 is a diagram for explaining a transmission message creation order according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Common processing unit, 1a ... Protocol layer counter, 2 ...
Protocol layer switching unit, 3A ... First layer individual processing unit, 3
B ... Second layer individual processing unit, 3C ... Third layer individual processing unit,
SL1 to SL6 ... Signal lines, CL ... Control signal lines.

Claims (2)

[Claims] 1. A multi-layer protocol processing method for processing a communication protocol having a hierarchical structure, wherein a common processing unit separates a received message into a protocol header and a protocol data unit for each layer, performs error checking, and provides each layer for each layer. By performing the sequence check of the separated protocol header in the layer individual processing unit, the common processing unit acquires the received data, and the protocol header data for each layer to be added to the transmission data is added to the layer individual processing unit. The multi-layer protocol processing method is characterized in that, in the common processing unit, the created protocol header data is added to the transmission data, error check information is created and added, and a transmission message is created. 2. A multi-layer protocol processing device for processing a communication protocol having a hierarchical structure, which is commonly used for assembling, disassembling, error checking and creating error check information of a protocol header and a message common to each layer in a received or transmitted message. A processing unit; a plurality of layer individual processing units for performing a sequence check of a protocol header for each layer in a received message and creating a protocol header for each layer in a transmitted message; and a plurality of layer individual processing units for the common processing unit A multi-layer protocol processing device, comprising: