KR0128871B1 - Device for generating a restart indicator message in atm - Google Patents

Abstract

Restated display message of Broadband Asynchronous Transfer Mode is generated by the following method; (a) Information discrimination bit and extension one of restart display message which consists of the input 8 bit octet, and code standard and information command which consists of the 8 bit octet is addressed/stored. (b) 8 bit octet which shows restart according to assignment of virtual channel is generated, which is addressed/stored. (c) 8 bit octet is formed by detecting the length of the restart display message, then the length of restart display message which consists of 8 bit octet is addressed/stored. (d) The length and address of stored restart display message are detected and so those are output of transfer channel.

Description

How to generate restart indication message in broadband asynchronous transmission mode

The present invention is suitable for generating a restart indication message in asynchronous transfer mode (abbreviated as ATM), in particular indicating a range of connection interfaces to be restarted in the Q.93B protocol. A method of generating a restart indication message.

In general, ATM is a communication scheme for implementing a Broadband Integrated Service Digital Network (BISDN), and is a special type of packet delivery scheme using Asynchronous Time Division Multiplex (ATDM).

In addition, in BISDN, information is transmitted by a continuous flow of packets having a constant size. The fixed size packets are called ATM cells, and the service inputted as shown in FIG. The information 11 is divided into short cells 12 of fixed length, and packetized by attaching a 5 byte header 12a to each cell. Each ATM cell has a total of 53 bytes. (Data 48 + header 5) and each ATM cell is multiplexed and transmitted.

The ATM cell is a connectivity method, and establishes a virtual channel to transmit service information. When the virtual channel is established, an identification signal for connection is provided and the identification number is released when the connection is released.

In addition, the order between ATM cells in a certain virtual channel is preserved by the function of the ATM layer, and signal information for connection establishment is transmitted through a separate ATM cell.

Meanwhile, the ATM scheme defines a layered protocol model for systematic and flexible information transfer. The protocol layer configured at this time is a physical layer 21, an ATM layer 22, an ATM adaptation layer 23, a higher layer 24, and the like, as shown in FIG.

In other words, ATM's protocol reference model is composed of management plane (A), control plane (B), and user plane (C), and among these (A, B, C) management plane (A) functions plane management and hierarchy management. Separated by.

The plane management refers to the overall management of the system, hierarchical management refers to the management of resources and usage variables, the control plane (B) manages call control and connection control information, and the user plane (C) manages the transfer of user information. do.

In addition, the protocols of the control plane (B) and the user plane (C) are divided into a higher layer 24, an ATM adaptation layer 23, an ATM layer 22, a physical layer 21, and the like. Is composed of a convergence sublayer that makes the user service information of the upper layer 24 into the protocol data unit and a truncation and recombination layer that forms the user information section of the ATM cell by cutting the protocol data unit.

Meanwhile, the ATM layer 22 controls user-to-network access and information flow, translates a virtual path identification number and a virtual channel identification number, connects to service access points, performs multiplexing and demultiplexing of cells, and physical layer 21. ) Is composed of a transport convergence sublayer and a physical medium sublayer, and performs cell separation, generation and confirmation of header error control bytes, and detection of cell boundary points.The upper layer 24 of the user plane C includes service information. Provides functions regarding the processing of

In addition, the upper layer 24 of the control plane B provides functions relating to call setup, call control, and call connection, which are achieved by exchanging control signal messages between user-networks. The control signal message may be divided into call setup, call information, call release, and additional information message according to each function.

At this time, call setup message is subdivided into call processing, connection, connection recognition, call setup, etc., call information message is subdivided into call resume, resume recognition, etc., and call release message is released, It is subdivided into completion of return, etc. The ITU-TS Recommendation Q.93B protocol message control format for each control signal message described above is shown in FIG.

That is, the user-to-many ATM call and the connection control message are, as shown in FIG. 3, a protocol discriminator signal 31 for determining the user-to-manage call control message from other messages, the user-manganese interface. The call reference signal 32, the message type signal 33, and the message length signal 34 are basically configured to detect a call destination that has sent a message of It is defined to include the variable length information 35 required according to the function of the message.

In addition, the variable length information 35 required for each of the above functions may include an information identifier 41, a coding standard 42, and an information element instruction as shown in FIG. (43), the information length 44 and the information content 45, and the message format for the restart indication message indicating the range of the connection interface to be restarted among the variable length information 35 according to the required function is provided. to be.

However, as described above, although the recommendation for the format of the restart indication message indicating the range of the connection interface to be restarted by being included in the variable length information required according to the function of the various control signal messages has been prepared, it generates a restart indication message. How to do or the device for realizing this has not been presented to date at all.

Accordingly, the present invention provides a method for generating a restart indication message indicating a range of a connection interface to be restarted by being included in variable length information required according to the function of various control signal messages in the Q.93B protocol in the asynchronous transmission mode. The purpose is.

In order to achieve the above object, the present invention provides a method for generating a restart indication message indicating a range of a connection interface to be restarted by being included in variable length information in a Q.93B signaling protocol in an asynchronous transmission mode, wherein the input 8-bit octet is input. A first step of addressing and storing each of a code standard and an information command consisting of an 8-bit octet including an information identification bit and an extension bit of a restart indication message; A second step of generating an address and storing an 8-bit octet indicating restart according to whether a virtual channel is designated; Detecting a length of the restart indication message to form an 8 bit octet, and giving and storing an address to the length of the restart indication message formed of the 8 bit octet; And a fourth step of extracting the length and the address of the stored restart indication message and outputting the same to the transmission channel.

1 is a format diagram of a typical ATM cell.

2 is a general protocol reference model diagram of a wideband asynchronous transmission mode.

3 is a message format diagram of a general Q.93B protocol.

4 is a general format diagram for variable length information required in accordance with the function of a control signal message.

5 is a hardware configuration diagram for practicing the present invention.

6 is a format diagram of a restart indication message of the present invention.

7 is a detailed flowchart illustrating a process of generating a restart indication message according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

61: Q.93B information providing unit 62: control unit

63: storage unit 64: address and length detection unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a hardware configuration diagram for generating a restart indication message according to the present invention, wherein the Q.93B information providing unit 61 providing information about the Q.93B protocol receives and restarts the information about the Q.93B protocol. A control unit 62 for controlling the generation of the display message, a storage unit 63 storing the restart display message generated by the control unit 62, and detecting and outputting an address and information length for the generated restart display message. The address and length detector 64 is configured to perform the following operations.

In general, the restart indication message according to the recommendation is the information identifier 51 of the restart indication message composed of the 8 bit octet of 01111001, CCITT standardized code standard 52 composed of the bit '00', as shown in FIG. ), An information command 53 consisting of bits '00000', an information length (L) consisting of two octets indicating the length of the restart indication message, a spare 54 consisting of bits '0000', and a designated virtual It consists of a class 55 consisting of '000' bits to indicate the restart of the channel and '010' to indicate the restart of all virtual channels controlled by a layer 3 entity sending a restart message.

Therefore, the control unit 62 sends the protocol determination signal 31 for determining the user-network call control message from the Q.93B information providing unit 61 and the message of the user-network interface. After receiving the information about the call reference signal 32, the message format signal 33, and the message length signal 34 for detection to generate the basic configuration for a message relating to general Q.93B, the restart indication of the present invention. Generates a message.

That is, when the Q.93B information providing unit 61 outputs an 8 bit octet of '01111001', which is the information identification bit 51 of the restart indication message, to generate the restart indication message, the controller 62 generates a message for the restart indicator. 8-bit octet, which is the information identification bit 51 of the restart indication message received from the Q.93B information providing unit 61, the sign standard 52 including the extension bit, and the information command 53, Each of the octets has an address and consists of a spare 54 consisting of bit '0000' received from the Q.93B information providing unit 61 and a '000' bit to indicate restart of the designated virtual channel. Indicating the restart of all virtual channels controlled by a Layer 3 entity transmitting a suffix, an 8-bit octet is generated by logical combination of a class 55 consisting of '010' and then the total length of the restart indication message (L). ) And produce Stores the restart indication message in the storage unit (63).

Accordingly, the message address and length detector 64 detects the address and information length of the generated restart indication message and outputs the address and information length to the ATM network so that the restart indication message is transmitted.

7 is a view illustrating an embodiment of a method for generating a restart indication message according to the present invention.

First, when the control unit 62 receives the octet information of '01111001', which is the information identification bit 51 of the restart indication message, from the Q.93B information providing unit 61 (400), recognizes that the message is generated for the restart indicator. The first address is assigned to the identification bit 51 of the restart indication message received from the Q.93B information providing unit 61 (A0) (401), and the second address (A1) is given by receiving octet information of '10000000'. After storing the identification bit 51 of the restart indication message of '01111001' and the octet information of '10000000' in the storage unit 63, the length (L) of the restart indication message is set to 5 (L1). (5).

In this case, the bit '1', which is the most significant bit of the octet information '10000000' to which the address A1 is assigned, represents an extended bit, and the bit '00' located in the 7-bit and 6-bit positions is a CCITT standardized code standard ( 52), and the bit '00000' located 5 bits from the least significant bit represents the information command 53.

In addition, if the extension bit located at the most significant bit of the 8-bit octet message is '0', it indicates that the current message is composed of group octets (multiple octets). It is composed of Octum.

In case of indicating restart of the designated virtual channel after the above process, an 8-bit octet of '10000000' is generated and an address is assigned (A4), and then stored in the storage unit 63 (404), and a layer 3 entity transmitting a restart message ( In the case of restarting all virtual channels controlled by an entity), an 8-bit octet of '100000000' and '00000010' are logically added to generate an 8-bit octet of '10000010' and given an address to the storage unit 63. Save (405).

After the above process, the length L of the restart indication message is stored in the third address A2 and the fourth address A3. Typically, the length of the message includes an 8-bit octet constituting an identification bit, a sign standard including an extended bit, The length of the message is represented as the number of octets except the 8-bit octet configured by the information command and the two 8-bit octets configuring the length of the information message.

Therefore, the control unit 62 subtracts 4 from the length L1 of the message set in step 403 (L = L1-4) (406), and the restart display message length L calculated in step 406 and the logic 1111111100000000. After multiplying by, shifting it 8 bits to the right to form the upper 8 bits of the restart indication message length (L) as an octet, giving a third address (A2) to the formed octet, and storing it in the storage unit 63 ( 407).

In addition, the lower 8 bits of the restart indication message length are formed as octets by logically multiplying the restart indication message length (L) calculated in step 406 by logic 0000000011111111, and assigning the fourth address (A3) to the formed octet, and storing the result. Stored at (63) (408).

After the above process, the control unit 62 detects the address and the message length of the restart indication message stored in the storage unit 63 and outputs it to the address and length detection unit 64. Output to the ATM network through the channel (428).

As described above, according to the present invention, in the Q.93B signaling protocol of ATM, a restart indication message indicating the range of a connection interface to be restarted by being included in variable length information is generated at high speed. The signaling process for communication control between networks can be effectively realized.

Claims (5)

In the Q.93B signaling protocol in the asynchronous transmission mode, a method of generating a restart indication message indicating a range of a connection interface to be restarted by being included in variable length information, the method comprising: an information identification bit of a restart indication message composed of an input 8-bit octet; A first step of addressing and storing each of the code standard and information command comprising 8-bit octets, including extended bits; A second step of generating an address and storing an 8-bit octet indicating restart according to whether a virtual channel is designated; Detecting the length of the restart indication message to form an 8-bit octet, and giving and storing an address to the length of the restart indication message formed to the 8-bit octet; And a fourth step of extracting a length and an address of the stored restart indication message and outputting it to a transmission channel. The method of claim 1, wherein the detecting of the length of the restart indication message in the third step comprises: a first step of initializing the restart indication message length to a first preset value; And a second process of detecting a length of the restart display message by subtracting a second preset value from the first preset value initialized in the first process. Way. The method as claimed in claim 2, wherein the first preset value for the restart indication message length is set to 5, and the second preset value is set to 4. . The method of claim 1, wherein the second step includes: a first step of generating an 8-bit octet of '10000000' and assigning an address after storing the designated virtual channel; And when it indicates the restart of all virtual channels controlled by the layer 3 entity transmitting the restart message, the 8-bit octet of '10000000' and '00000010' are logically generated to generate an 8-bit octet of '10000010' Generating a restart indication message in a wideband asynchronous transmission mode; 5. The method of claim 4, wherein the second process logically adds 8-bit octets of '10000000' and '00000010' to indicate '10000010' when indicating the restart of all virtual channels controlled by the layer 3 entity transmitting the restart message. And generating an 8-bit octet of the restart indication message in the wideband asynchronous transmission mode.