KR0128866B1 - User information layer & protocol message generating method of atm - Google Patents

Abstract

User information level 2 protocol of ATM is generated by the following method. (a) The first octet message is generated by using level 2 discriminating bit and user information 2 protocol bit, and then the generated 8 bit octet is stored with addressing. (b) The message added according to user information level 2 protocol bit by each protocol recommendation is generated, and then the generated added message is stored with addressing. (c) Each address of the generated/stored message and total length of message are output transfer channel.

Description

User Information Layer and Generation of 2 Protocol Messages in Asynchronous Transmission Mode

The present invention relates to a message generating method suitable for generating a user information layer 2 protocol message included in the broadband lower layer information in the Q.93B protocol in the asynchronous transfer mode (hereinafter referred to as ATM). will be.

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 service information inputted as shown in FIG. (11) is divided into short cells 12 of fixed length, and then packetized by attaching a header 12a of 5 bytes to each cell, each ATM cell having a total of 53 bytes ( Data 48+ header 5) and each ATM cell is multiplexed and transmitted.

The ATM cell is a connectivity method, which establishes a virtual channel and delivers service information. When the virtual channel is established, a connection identification number is assigned 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.

On the other hand, the ATM scheme defines a layered protocol model for systematic and flexible information transfer. The protocol layer configured at this time, as shown in Figure 2, the physical layer 21, ATM layer 22, ATM adaptation layer 23 and the upper layer 24 and the like will be described in detail as follows. .

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

The average management refers to the overall management of the system, hierarchical management refers to the management of resource 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 unit layer that forms the user information section of the ATM cell by cutting the protocol data unit.

Meanwhile, the ATM layer 22 translates a user-network connection and information flow, translates a virtual path identification number and a virtual channel identification number, connects to service access points, multiplexes and demultiplexes cells, and performs a physical layer 21. ) Consists of a transport convergence sublayer and a physical medium sublayer to perform separation of cell speed, generation and confirmation of header error control bytes, detection of cell boundary points, and the upper layer 24 of the user plane C. 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 a call setup, a call setup call release, and an additional information message according to each function.

At this time, the call setup message is subdivided into call processing, connection, connection recognition, call setup, etc., the call information message is subdivided into call resume, resume recognition, etc., and the call release message is released, Subdivided into return completion and the like, 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-manufactured ATM call and the connection control message may include a protocol discriminator signal 31 for determining the user-to-network call control message from another message, as shown in FIG. A call reference signal 32, a message type signal 33, and a message length signal 34 for detecting the call destination that transmitted the message of the interface are basically configured and each control It is defined to include the variable length information 35 required according to the function of the signaling message.

In addition, as shown in FIG. 4, the variable length information 35 required for each of the above functions includes an information identifier 41, a coding standard 42, and an information information element. means (43), information length (44) and information content (45), the means being used for compatibility checking by the addressed entity, among the additional information (5), in particular according to the required function. Broadband low-level information for providing, as shown in Figure 5, the information identifier (51) of broadband low-layer information consisting of 8-bit octets of 01011111, CCITT standardized code standard consisting of 2 bits of 00 (information element instruction field) 53 consisting of (coding standard) 52,00000, length of information 54 consisting of two octets representing the length of wideband lower layer information, with two bits. Configured layer identifier (layer i dentifier 55, and user information layer protocol massage 56.

These user information layer protocol messages are selectively applied to public user-network setup messages, but are mandatory to dedicated user-network protocols. The user information layer 1 protocol message and the user information layer 2 protocol message, and It is divided into user information layer 3 protocol messages and recommendations on the format of each user information layer protocol message have been prepared.

However, as noted above, the recommendation for the format of a User Information Layer 2 protocol message, which is included in the broadband lower layer information message used for compatibility checking by an addressed entity, provides information for compatibility with User Information Layer 2, Although presently prepared, a method for generating such a user information 2 protocol message or an apparatus for realizing the user information 2 protocol message has not been presented until now.

Accordingly, the present invention provides a method for generating a user information layer 2 protocol message included in the broadband lower layer information in the asynchronous transmission mode Q.93B protocol to provide information and means for compatibility with the user information layer 2. The purpose is.

In order to achieve the above object, the present invention provides a method for generating a user information layer 2 protocol message included in the broadband lower layer information in the Q.93B signaling protocol in the asynchronous transmission mode to provide information for compatibility with the user information layer 2. A first step of: generating a first octet message using layer 2 identification bits and user information layer 2 protocol bits, and then storing and addressing the generated 8-bit octet; A second step of generating a message added according to the contents of the user information layer 2 protocol bits according to each protocol recommendation, and then addressing and storing the generated additional message; And a third step of outputting each address and the total message length of the messages generated and stored in the first and second steps through a transmission channel.

1 is a general ATM cell format diagram.

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 according to the function of a control signal message.

5 is a general message format diagram for broadband sublayer information applied to the present invention.

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

7 is a format diagram for user information layer 2 protocol message applied to the present invention.

8 is a detailed flowchart illustrating a process of generating a user information layer 2 protocol 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.

6 is a hardware configuration diagram for generating a user information layer 2 protocol message according to the present invention. The Q.93B information providing unit 61 which provides information about the Q.93B protocol and the information about the Q.93B protocol are provided. A control unit 62 for receiving and controlling generation of the user information layer 2 protocol message, a storage unit 63 storing information on the user information layer 2 protocol message generated by the control unit 62, and a generated user information layer 2 consists of an address and length detector 64 which detects an address and an information length for a protocol message and outputs the same, and performs the following operations.

In general, the user information layer 2 protocol message includes an extension bit 71 which constitutes the most significant bit of the 8-bit octet, and an identification bit for layer 2, as shown in FIG. identifier bits 72, user information layer 2 protocol bits 73, user information layer 2 protocol bits according to each protocol recommendation are CCITT Recommendation X.25 link layer, CCITT Recommendation, as shown in FIG. 7 (b). Mode bits of operation 74 for CCITT encoding provided for X.25 multi-link layer, HDLC ARM (ISO4335), CCITT Recommendation Q922 or ISO 7776 DTE-DTE operation. (c) reserved bits 75 and Q.93B use bits 76 (Fig. 7 (d)) and window size 77, user information layer 2 protocol bits are user defined. Case consists of user-defined layer 2 protocol information 78 provided.

Accordingly, the control unit 2 detects the protocol determination signal 31 for determining the user-network call control message from another message from the Q.93B information providing unit 61, and the call destination where the message of the user-network interface is transmitted. Receive the information about the call reference signal 32, the message format signal 33, and the message length signal 34 to generate a basic configuration for a message relating to general Q.93B, and then Message received from the broadband sublayer information, that is, the information identifier 51 of the broadband sublayer information composed of 8-bit octets of 01011111, the CCITT standardized code standard 52 composed of 2 bits of 00, and an information command composed of 00000. 53).

Further, after the above process, if the Q.93B information providing unit 61 outputs the identification bit 72 (logic '10') for the user information layer 2 to generate the user information layer 2 protocol message of the present invention, Recognizing that the message is generated for the user information layer 2 protocol, 62 retrieves the user information layer 2 protocol bits 73 (FIG. 7 (b)) received from the Q.93B information providing unit 61, and retrieves user information. The information message provided in accordance with the Layer 2 protocol bits 73, i. Operation mode bits 74 and (Fig. 7 (c)) reserved bits 75 and Q.93B usage bits 76 (Chapter 7) for CCITT encoding provided in case of recommended Q922 or ISO 7776 DTE-DTE operation. (D)) and window size bits 77, and user information layer 2 protocol bits 73 After creating a custom layer 2 protocol information 78, if provided uiil and stores it in the storage unit (63).

Accordingly, the message address and length detector 64 detects the address and information length of the generated information message of the user information layer 2 protocol and outputs the address and information length to the ATM network so that the broadband lower layer 2 protocol information is transmitted.

8 illustrates an embodiment of a method for generating a user information layer 2 protocol message included in broadband lower layer information according to the present invention.

First, upon receiving the layer identification bit 72 from the Q.93B information providing unit 61, the controller 62 detects the layer identification bit 72 and if the layer identification bit 72 is logic '10', then the user information layer. After recognizing that the message is generated for the 2 protocol (100), the user information layer 2 protocol bit 73 is read (101) (Fig. 7 (a)).

At this time, the user information layer 2 protocol bit 73 is composed of different codes according to the protocol recommendation, as shown in FIG. 7 (b). The basic mode ISO 1745 is 00001, and the CCITT recommendation Q.921 is 00010. , CCITT Recommendation X.25 link layer 00110, CCITT X.25 multi-link layer 00111, extended LAPD for half duplex operation 01000, HDLC ARM (ISO 4335) 0100,01010, 01011, LAN logical connection control (ISO 8802/2) is configured to apply 01100, CCITT Recommendation X.75 single-link procedure 01101, CCITT Recommendation Q.922 01110, user-defined 10000, and ISO 7776 DTE-DTE operation 10001.

Accordingly, the control unit 62 reads any one of the user information layer 2 protocol 5 bits output from the Q.93B information providing unit 61 of the user information layer 2 protocol 5 bits according to each recommendation as described above. XXXXX which is the user information layer 2 protocol bit 73 outputted from the Q.93B information providing unit 61 to the logic '01000000' generated by shifting the layer identification bit 72 which is 10 'and shifted by 5 bits. In this case, XXXXXX adds one of 5 bits of user information layer 2 protocol according to each recommendation) to generate an 8-bit octet message of logic '010XXXXX', and the 8-bit octet message of logic '010XXXXX' generated in this way. An address A0 is given to the storage unit 63 and stored in the storage unit 63, and the length L = 1 for the generated octet message is stored (103).

In this case, when the most significant bit of the generated 8-bit octet message is an extended bit and the most significant bit is '0', it indicates that the current message is composed of group octets (multiple octets), and the most significant bit is '1'. In this case, it indicates that the current message consists of a single octet.

After the above process, the control unit 62 retrieves the user information layer 2 protocol 6 bits 73 output from the Q.93B information providing unit 61 (104) according to the user information layer 2 protocol bits 73 as follows. Perform the action.

That is, when the user information layer 2 protocol bit 73 is user defined with '10000' (104), the user defined layer 2 protocol information 78 received from the Q.93B information providing unit 61 is added to '10000000'. Form an 8-bit octet and give an address to the user information layer 2 protocol formed of the 8-bit octet (A1), store it in the storage unit 63, and store the length (L = 2) of the octet message (105). ).

In this case, the reason for adding 10000000 to the user-defined layer 2 protocol information defined by the user is to generate '1', that is, the most significant bit of the 8-bit octet, that is, the extension bit.

In addition, User Information Layer 2 protocol bits 73 are 00001 (basic mode ISO 1745), 00010 (CCITT Recommendation Q.921), 01000 (extended LAPD for half duplex operation), 01100 (LAN logical connection control (ISO 8802). / 2)), 0110 (CCITT Recommendation X.75 Single Link Procedure) (104), in step 103, an address A0 is given and the logic '010XXXXX' stored in the storage unit 63 is read and the logic ' After adding 10000000 to 010XXXXX '(106), it is stored again in the storage unit 63.

In addition, the user information layer 2 protocol bits 73 are 00110 (CCITT Recommendation X.25 Link Layer), 00111 (CCITT Recommendation X.25 Multiple Link Layer), 01001 (HDLC ARM (ISO 4335)), 01011 (HDLC ARM ( ISO 4335)), 01110 (CCITT Recommendation Q.922)), or 10001 (ISO 7776 DTE-DTE operation), the operation mode bits 74 and (Fig. 7 (c)) reserved bits for CCITT encoding. 75) and Q.93B usage bit 76 and window size bit 77.

That is, the controller 62 searches for an operation mode for CCITT encoding (107), generates a '00100000' if the operation mode is a normal mode, and then gives an address (A1) (108), and if the operation mode is an extended mode, 0100000. After generating the address, A1 is assigned an address (108), and the addressed octet message and the length (L = 2) of the octet message are stored in the storage unit (108) (Fig. 7 (c)). .

In this case, in the normal mode, '0', which is the most significant bit of '00100000' generated by the controller 62, represents an extension bit, and '01' located in 7-bit and 6-bit positions represents an operation mode bit 74. '000' located in the 5-bit and 4-bit and 3-bit positions represents the reserved bit 75, and '00' located in the 2-bit and least significant bit positions represents the Q.93B usage bit 76.

Similarly, in the extended mode, '0', which is the most significant bit of '010000000' generated by the controller 62, represents an extended bit, and '10' located in 7-bit and 6-bit positions represents an operation mode bit 74. '000' located in the 5-bit and 4-bit and 3-bit positions represents the reserved bit 75, and '00' located in the 2-bit and least significant bit positions represents the Q.93B usage bit 76.

After the above process, the controller 62 forms an 8-bit octet by adding the window size bit 77 provided from the Q.93B information providing unit 61 to the logic '10000000' (109), and then adds an address to the formed octet message. (A2) completes the generation of the user information layer 2 protocol message by storing the addressed octet message and its length (L = 3) in the storage unit 63 (110).

After the process, the control unit 62 detects the address and the message length of the user information layer 2 protocol message stored in the storage unit 63 and outputs it to the address and length detection unit 64. The address and length detection unit 64 shows this. It outputs to the ATM network through the omitted transport channel (111).

As described above, according to the present invention, the ATM information is rapidly generated by generating a user information layer 2 protocol message included in the broadband lower layer information in the Q.93B signaling protocol of the ATM and providing information for compatibility with the user information layer 2. The signaling process for communication control between networks in the Q.93B signaling protocol of C.93B can be effectively realized.

Claims (9)

A method for generating a user information layer 2 protocol message included in the broadband lower layer information in the asynchronous transmission mode Q.93B signaling protocol and providing information for compatibility with user information layer 2, the layer 2 identification bit and the user information A first step of generating a first octet message using layer 2 protocol bits and then addressing and storing the generated 8-bit octet; A second step of generating a message added according to the contents of the user information layer 2 protocol bits according to each protocol recommendation, and then addressing and storing the generated additional message; And a third step of outputting each address and the total message length of the message generated and stored in the first step and the second step to a transmission channel. . 2. The method of claim 1, wherein generating the first octet message in the first step comprises generating a first extended bit. The method of claim 1 or 2, wherein the first step; A first step of reading the user information layer 2 protocol bit when the layer identification bit is recognized to be a message generation for the user information layer 2 protocol; Shifting the layer identification bit by a predetermined bit and then logically operating the shifted layer identification bit and the user information layer 2 protocol bit to generate a first octet message; And a third process of storing a length of the addressed first octet message and the first octet message by assigning a first address A0 to the first octet message. How to generate Layer 2 protocol messages. 4. The method of claim 3, wherein the layer identification bit is shifted 5 bits to perform a logical operation with the user information layer 2 protocol bits. 5. The method of claim 4, wherein the first octet message is generated by adding the shifted layer identification bits and the user information layer 2 protocol bits. The method of claim 2, wherein the second step; A first step of generating a second octet message by performing logical operation on the second extension bit and the user defined layer 2 protocol information when the content of the user information layer 2 protocol bit 73 is user defined; If the contents of the user information layer 2 protocol bit 73 require additional messages such as operation mode bits and reserved bits and Q.93B usage bits and window size bits, then the operation mode bits and reserved bits and Q.93B Generating a use bit and a window size bit sequentially; And a third process of converting the first extension bit of the first octet message generated in the first step when the content of the user information layer 2 protocol bit 73 does not require an additional message. A method for generating user information layer 2 protocol messages in asynchronous transmission mode. 7. The user information layer of claim 6, wherein the first process is performed by adding the second extension bit and user-defined layer 2 protocol information to give an address and storing the address. 2 Protocol message generation method. The method of claim 6 or 7, wherein the second process; The operation mode is searched and the third extension bit, the general operation mode bit, the reserved bit, and the Q.93B use bit are simultaneously formed when the operation mode is the normal operation mode. Forming all bits and Q.93B used bits into 8 bit octets, and addressing and storing a third octet message formed of 8 bit octets; Search for an operation mode to perform the third extended bit, the extended operation mode bit, the reserved bit, and the Q.93B use bit to be simultaneously formed when the operation mode is the extended operation mode; Forming all of the reserved bits and the Q.93B used bits into 8 bit octets, and addressing and storing the third octet message formed of 8 bit octets; Logically operating the fourth extension bit and the window size bit to form a fourth octet message, and then form an fourth octet message formed and then assign an address to the fourth octet message formed; And storing the lengths of the first octet message, the third octet message, and the fourth octet message, and storing the third octet message and the fourth octet message. . The method of claim 8, wherein the fourth octet message is generated by adding the fourth extension bit and the window size bit.