KR0128873B1 - Method for generating a transit network selection in atm - Google Patents

Abstract

The transporting network selection message generating method is comprised of the structure, wherein upon an information providing part(61) of Q.93B outputting a 8-bit octet of an information identifying of a transporting network selection message, a control part(62) conceives message generation with regard to the transporting network selection, assigning addresses to the information identifying bits of the transporting network selection message received and 8-bits octet including an extension bit, respectively, the control part(62) making logical combination of a network identifying form received from the information providing part(61) of Q.93B and a network identifying plan to generate 8-bit octet, then assigning an address, after assigning the address, storing a whole length(L) of the transporting network selection message and the generated transporting network selection message in a storing part(63), a message address and length detecting part(64) detecting the address and the information length with regard to the transporting selection message completely generated to output the same to the ATM network through a transfer channel, transporting the transporting selection message.

Description

Method of Generating Transport Network Selection Message in Broadband Asynchronous Transmission Mode

The present invention relates to a method for generating a message suitable for generating a transport selection message for identifying a transport network requested in the Q.93B protocol, particularly in an asynchronous transfer mode (ATM). will be.

In general, ATM is a communication method for implementing a Broadband Intergrated Service Digital Network (BISDN), and is a special type of packet type delivery method 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 5 bytes of headers 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 deliver service information. A connection identification number is assigned every time a virtual channel is established, 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.

That is, the protocol reference model of ATM consists of management plane (A), control plane (B), and user plane (C), and the functions of the two (A, B, C) management planes (A) are plane management and hierarchy management. Separated by.

The plane management means overall management of the system, hierarchical management means management of resources and usage variables, the control plane (B) manages call control and connection control information, and the user plane (C) Manage the delivery.

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 a user information section of the ATM cell by cutting the protocol data unit.

Here, the ATM layer 22 controls the user-to-network connection and information flow, translates the virtual path identification number and the virtual channel identification number to connect with service access points, multiplex and demultiplex cells, and the physical layer ( 21) is composed 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 related to the processing of information.

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 can 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 set up, call information message is subdivided into call resume, resume recognition, etc., and call release message is released. 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 includes an information identifier 41, a coding standard 42, and an information element instruction as shown in FIG. (43), information length (44) and information content (45), and the format for the transport network selection message for identifying the requested transport network among the variable length information 35 according to the required function is prepared. .

However, as described above, although the recommendation for the format of the transport network selection message for identifying the transport network requested by being included in the variable length information required according to the function of various control signal messages has been made, the generation of such transport network selection message is generated. 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 transport network selection message for identifying a requested transport network by being included in variable length information required according to the function of various control signal messages in the Q.93B protocol in asynchronous transmission mode. There is a purpose.

In order to achieve the above object, the present invention provides a method for generating a transport network selection message included in variable length information in asynchronous transmission mode Q.93B signaling protocol and used to identify a transport network requested. A first step of addressing and storing each of a code standard and an information command composed of 8-bit octets including an information identification bit and an extension bit of the transport network selection message; A second step of logically computing a network identification format and a network identification plan to form an 8-bit octet and then assigning an address, and sequentially receiving and storing an address of three octets formed according to the network identification plan and storing the address; Detecting a length of the transport selection message and forming an 8-bit octet, and giving and storing an address to the length of the transport selection message formed of 8-bit octets; And a fourth step of extracting the length and address of the stored transport network selection message and outputting the transport channel to the transport channel.

In addition, the message generating method according to the present invention detects the length of the transport network selection message by logically subtracting 4 and then logically subtracting 4 from the initialization value set to 5 and the addressing number of the network identification 56.

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 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 transport network message of the present invention.

7 is a detailed circuit diagram illustrating a process of generating a transport network selection 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 transport network selection message according to the present invention, wherein the Q.93B information providing unit 61 providing information about the Q.93B protocol receives the information about the Q.93B protocol and transports the network. A control unit 62 for controlling generation of the selection message, a storage unit 63 storing the transport network selection message generated by the control unit 62, and detecting and outputting an address and information length for the generated transport network selection message. The address and length detector 64 is configured to perform the following operations.

In general, the transport selection message according to the recommendation is the information identifier 51 of the transport selection message composed of 8-bit octets of 01111000, CCITT standardized code standard 52 composed of bits '00', as shown in FIG. ), An information command 53 composed of bits '00000', an information length L composed of two octets, an information length L indicating a length of a transport selection message, and a '0100000' indicating an international indentification. (54), a network identification plan 55 consisting of '0001' representing a carrier identification code, and a three octet network identification 55 formed according to the network identification plan 55 It is composed.

Accordingly, the control unit 62 detects the protocol determination signal 31 for determining the user-manganese call control message from the other message from the Q.93B information providing unit 61, and the call destination which transmitted the message of the user-manganese interface. After receiving 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, Generates a transport selection message.

That is, when the Q.93B information providing unit 61 outputs an 8-bit octet of '01111000', which is the information identification bit 51 of the transport selection message, to generate the transport selection message, the controller 62 generates a message for transport selection. 8-bit octet which is the information identification bit 51 of the transport selection message received from the Q.93B information providing unit 61, the code standard 52 including the extension bit, and the information command 53. Each address is assigned to an octet, and the 8-bit octet is logically combined with the network identification format 54 consisting of '0100000' and the network identification plan 55 composed of '0001' received from the Q.93B information providing unit 61. And then assign an address, and sequentially receive three octets of network identification 56 formed according to the network identification plan 55, and select the total length L of the transport network selection message and the generated transport network after addressing. The message is stored in the storage unit 63.

Therefore, the message address and length detector 64 detects the address and information length of the generated transport network selection message and outputs it to the ATM network through the transport channel, not shown, so that the transport network selection message is delivered.

7 illustrates an embodiment of a method for generating a transport network selection message according to the present invention.

First, when the control unit 62 receives the octet information of '01111000', which is the information identification bit 51 of the transport network selection message, from the Q.93B information providing unit 61 (400), it recognizes that the message is generated for the transport network selection. The first address is assigned to the identification bit 51 of the transport selection message received from the .93B information providing unit 61 (A0) (401), and the second address (A1) is given by receiving octet information of '10000000'. (402), the identification bit 51 of the transport selection message of '01100010' and the octet information of '10000000' are respectively stored in the storage unit 63, while the length L of the transport selection 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 has been assigned in step 402, represents an extended bit, and the bit '00' located in the 7-bit and 6-bit positions represents the CCITT standardized code standard ( 52), 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 octets.

After the above process, the network identification form 54 consisting of '0100000' representing international network identification, the network identification plan 55 consisting of '0001' representing a return identification code, and '10000000' are logically added to form an 8-bit octet. After assigning the address (A4) and storing it in the storage unit 63 (404).

In addition, after receiving the network identification 56 of three octets formed in accordance with the network identification plan 55 in sequence (A5, A6, A7) and stores them in the storage unit (63) (405), After adding the address number of times of network identification 56 performed in step 405 (3 times) to the length L1 of the transport selection message set in step 403 (L2 = L1 + 3) (406), the third address ( The length L of the transport selection message is stored at A2) and the fourth address (A3). Typically, the length of the message is 8 bits consisting of an 8-bit octet constituting an identification bit, a sign standard including extended bits, and an information command. The number of octets except the two 8-bit octets constituting the length of the octet and the information message indicates the length of the message.

Accordingly, the control unit 62 subtracts 4 from the length L2 of the message calculated in step 406 (L = L2-4) (407), and the transport network selection message length L calculated in step 407 and the logic 1111111100000000. After multiplying by and shifting the right 8 bits, the upper 8 bits of the transport selection message length L are formed into octets, and the third address A2 is assigned to the octets, and then stored in the storage unit 63 (408).

The lower 8 bits of the transport network selection message length are formed by octet by logically multiplying the transport network selection message length L and the logic 0000000011111111 in step 407, and assigning the fourth address (A3) to the octet formed as described above. Stored in (63) (409).

After the process, the control unit 62 detects the address and the message length of the transport network selection message stored in the storage unit 63 and outputs it to the address and length detection unit 64, and the address and length detection unit 64 is omitted. Outputting to the ATM network through the transport channel (408).

As described above, according to the present invention, a Q.93B signaling protocol of ATM generates a transport selection message which is included in variable length information and used to identify a requested transport network at high speed, thereby providing to the ATM network side. The signaling process for communication control between networks in the 93B signaling protocol can be effectively realized.

Claims (5)

A method for generating a transport selection message included in variable length information used for identifying a requested transport network in a Q.93B signaling protocol in an asynchronous transmission mode, the information identification bit of the transport selection message consisting of an input 8-bit octet And a first step of addressing and storing each of a code standard and an information command consisting of 8-bit octets including extended bits; A second step of logically computing a network identification format and a network identification plan to form an 8-bit octet and then assigning an address, and sequentially receiving and storing an address of three octets formed according to the network identification plan and storing the address; Detecting a length of the transport selection message and forming an 8-bit octet, and giving and storing an address to the length of the transport selection message formed of 8-bit octets; And extracting the length and address of the stored transport network selection message and outputting the transport channel selection message to a transport channel. The method of claim 1, wherein the detecting of the length of the transport selection message in the third step comprises: a first step of initializing the length of the transport selection message to a first preset value; A second step of performing a logical operation on an address number of times of network identification 56 and the first preset value; And a third step of detecting a length of the transport network selection message by performing a logical operation on a second preset value based on a logical operation of the number of address assignments of the network identification 56 and the first preset value. A method for generating a transport network selection message in a wideband asynchronous transmission mode. The method of claim 2, wherein the first preset value for the transport network selection message length is set to 5, and the second preset value is set to 4. . 4. The method of claim 3, wherein the length of the transport network selection message is detected by logically adding the first preset value and the number of address assignments of the network identification 56, and then logically subtracting the second preset value. A method for generating a transport network selection message in wideband asynchronous transmission mode. 2. The wideband asynchronous transmission of claim 1, wherein the second step logically adds a network identification format consisting of '0100000', a network identification plan consisting of '0001', and '10000000' to form an 8-bit octet. How to generate a transport selection message in mode.