KR970002790B1 - Method for generating a colling party subaddress message in atm - Google Patents

Abstract

A calling party sub-address message generating method in the ATM where generates the calling party sub-address message using to distinguish the sub-addresses, included in the broadband low layer information in the Q.93B protocol.

Description

How to generate call party sub address message in asynchronous transmission mode

1 is a format diagram showing a data structure for a typical ATM cell.

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

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

4 is a format diagram for a general message type for variable length information required according to the function of a control signal message.

5 is a format diagram of a general call party sub-address message type generated in accordance with the present invention.

6 is a schematic block diagram of a system for implementing the present invention.

7 is a flowchart illustrating a process of generating a call party sub-address message according to a preferred embodiment of the present invention.

8 shows each address used for explaining the method for generating a call party sub-address message of the present invention.

* Explanation of symbols for the main parts of the drawings

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

63: storage unit 64: address and length detection unit.

According to the present invention, in the asynchronous transmission mode (hereinafter, simply referred to as ATM), in particular, the calling party subaddress (hereinafter referred to as CPS) included in the broadband sublayer information in the Q.93B protocol is used. ) Is about how to generate a message.

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

On the other hand, in BISDN, information is transmitted by a continuous flow of packets having a constant size. The packets of fixed size are called ATM cells. In more detail, as shown in FIG. 1, the ATM cell divides a plurality of input service information 11 into short cells 12 having a fixed length, and then header information of 5 bytes in each cell. Packet information obtained by attaching (header information) 12a, each ATM cell is composed of a total of 53 bytes (data information 48 + header information 5), and each of these ATM cells is located at the bottom of FIG. As shown, multiplexed 13 is transmitted over the transport channel.

In addition, the ATM cell as described above is a connectivity method, and establishes a virtual channel to transmit service information. When the virtual channel is established, an identification number for connection is given and the identification number is released together 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 communication scheme as described above defines a layered protocol reference model for systematic and flexible information delivery. In this case, the protocol layer envisioned may be a physical layer 21, an ATM layer 22, an ATM adaptation layer 23, an upper layer 24, and the like, as shown in FIG. As follows.

That is, the protocol reference model of ATM consists of a management plane (A), a control plane (B), and a user plane (C), and the functions of the management plane (A) among these three planes (A, B, C) are planes. It is divided into management and hierarchy management.

Here, plane management means overall management of the system, and hierarchy management means management of resources and variables used. In addition, the control plane (B) manages call control and connection control information, and the user plane (C) manages the transfer of user information.

Furthermore, the protocol of control plane B and user plane C is divided into upper layer 24, ATM adaptation layer 23, ATM layer 22, physical layer 21, and the like. Although not shown, the ATM adaptation layer 23 cuts the convergent sublayer and protocol data unit, which makes user service information of the upper layer 24 into protocol data units, to a predetermined size, thereby forming a user information section of an ATM cell. And a recombination layer.

In addition, the ATM layer 22 controls user-to-network access and information flow, translates virtual path identification numbers and virtual channel identification numbers, connects to service access points, performs multiplexing and demultiplexing of cells, and physical layer 21. ) Is composed of a transmission 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 Provides a function for processing service information.

In addition, the upper layer 24 of the control plane B provides functions related 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.

Here, the call establishment 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. 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 may include a protocol discriminator 3l for determining the user-to-manage call control message from another message, as shown in FIG. Call reference signal (32), message type signal (message type) 33, message length signal (34) and message length 34 are basically configured to detect call destinations that have sent messages. The variable length information 35 required according to the function of the signal message is defined to be included.

The present invention is substantially contained in the variable length information described above and relates to a method for generating a call party sub-address (CPS) message used to distinguish a sub-address connected to the first place of call, i.

On the other hand, as described above, the general variable length information 35 required for each function is, as shown in FIG. 4, an information identifier 41 and a coding standard 42.

And an information element instruction 43, an information length 44 and an information content 45.

In particular, the CPS information included in the variable length information and used to distinguish the sub-address related to the present invention is an information element of broadband sublayer information composed of 8-bit octets of 01101101, as shown in FIG. identifier (51), CCITT standardized coding standard (52) consisting of two bits of 00, information element instruction field (53) consisting of five bits of 00000, and a broadband lower layer consisting of two octets. Length of information (54) indicating the length of information, a sub-address format signal (Type of subaddress) 55 consisting of 3 bits of 000, and odd / even indicator information consisting of 1 bit 56 ), And a spare bit 57 consisting of three bits of 000 and subaddress information 58 consisting of one octet.

In the sub-address information 57 of the call party sub-address message having the above-described configuration, the NSAP X.213 / ISO8348 AD 2 address may be formatted as specified in octet 6 including an authority and a format identifier. There is a number. Such encoding is performed via "binary encoding" as defined in X.213 / ISO8348 AD 2. In addition, the type of sub-address is described in Recommendation I.334.

On the other hand, the call party sub-address message as described above is simply passing the ATM address to the OSI (open systems interconnection) NSAP over the public network supported by Recommendation E.164 address. . Thus, for a public user network interface (UN), there is a need to cooperate with the network provider about the availability of information elements.

Here, OSI means that as public service providers provide a wide range of distributed information services, standardization organizations related to telecommunications fields establish high-level standards regarding not only network interface but also information exchange control and data format between systems. It refers to the work on the standardization function that allows open systems (eg computers) that can exchange information between equipments of each other to communicate freely with each other at the application level. This environment is called OSI environment.

Therefore, the practical purpose of the OSI as described above is to enable data interchange between the two computers regardless of the manufacturer of the system (computer, etc.) and the operating system used within the computer. Therefore, in the use of the system, it is possible to overcome the dependence on the specific manufacturer.

In addition, for public UNIs, network providers have the option of not having to support these elements in the SETUP message. Therefore, support of these information elements is essential for the private UNI.

However, as described above, the recommendation for the format of the call party sub-address (CPS) message used to distinguish the sub-address connected to the requesting party from among the variable-length messages required according to each function is presently prepared as described above. However, how to generate a CPS message or a device for realizing the same has not been presented to date.

Accordingly, an object of the present invention is to provide a method for generating a call party sub-address (CPS) message included in wideband sublayer information in the Q.93B protocol and used to distinguish sub-addresses.

In order to achieve the above object, the present invention provides a method for generating a call party sub-address message used to distinguish a sub-address connected to a requesting party in an asynchronous transmission mode, wherein the information is based on bit information provided from an information park. The first step of generating the contents of the identifier, the code standard and the information command message and storing them in a predetermined address of the memory, and by repeating a predetermined number of times based on the bit information provided from the information park, the predetermined call party sub A second process of generating an address message and sequentially storing an address start address and total length information of a newly generated message in a predetermined address of the memory; and in the call party sub-address message generated by the second process and stored in the memory. Start of address for It provides support for new information and generate messages that are made of a third process of detecting and outputting the Length information in the call in an asynchronous transfer mode party sub-address message generation method.

In addition, the CPS message generating method according to the present invention as described above, further comprising the step of converting the call party sub-address message generated in the unit of bytes into octets of 8 bits, the call party except for header information Convert the sub address information in octet units.

Moreover, the message conversion process converts the message in octets by substantially shifting 8 bits each to the right and left.

Other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

6 shows a schematic block diagram of a hardware system for generating a CPS message in accordance with the present invention.

As shown in the figure, the hardware system for message generation receives the Q.93B information providing unit 61, which provides information about the Q.93B protocol, and the information about the Q.93B protocol, according to the present invention. The controller 62 controls the generation of the message, the storage unit 63 stores information on the CPS message generated by the controller 62, and detects and outputs the address and information length of the generated CPS message. And an address and length detector 64.

In FIG. 6, the control unit 62 detects the protocol determination signal 31 for determining the user-network call control 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 Receive 109 and store 109 at address a [0] of the storage unit 63 to generate the CPS message about the broadband lower layer information, that is, the information identifier 51 of the broadband lower layer information composed of 8 bit octets of 0110l101. In order to generate the CCITT standardized code standard 52 composed of 2 bits of 00, and the information command 53 composed of 5 bits of 00000, 128 is stored at the address a [1] in the storage 63.

Further, in order to generate the CPS message according to the present invention after the above process, the control unit 62 performs the sub-address format signal 55, the odd / Even display information 56, extra bits 57, and sub-address information 58 are generated.

Accordingly, the message address and length detection unit 64 detects the address and information length of the generated CPS information message and outputs the address and information length to the ATM network by transmitting the CPS message of the broadband lower layer information to the called user through a transport channel (not shown). Delivered.

Next, a preferred embodiment of the present invention for generating a CPS message as described above will be described in detail with reference to FIG.

7 is a flowchart illustrating a process of generating a CPS message included in wideband lower layer information according to the present invention.

First, as can be seen from the figure, the control section 62 receives the octet information " 109 " indicating the CPS from the information providing section 61, stores it in the address a [0] in the storage section 63, and stores the address. By storing "128" in a [1], one octet of information identifier 51 composed of 01101101 bits shown in FIG. 5, one octet extended bits composed of 10000000 bits, sign standard 52, and After the information command 53 is formed, i to be used as a count is initialized to 0, and L representing the total length of the CPS content information is set to 5 (step 100), and then the extended bit, the sub address format signal 55, the odd In order to generate octet 5 consisting of the even indication information 56 and the extra bits 57, 128, i.e., 10 million bits of information are stored in the address a [4] shown in FIG. 102).

The reason for storing "128" (10000000) in the address a [1] in the step 100 and the "128" in the address a [4] in the step 102 is the most significant bit of the 8-bit octet. This is to generate an extension bit, i.e., the extension bit is 1 because the following information data exists.

Then, the control unit 62 copies and stores the contents of the address b in the storage unit 63 shown in FIG. 8 (b) while increasing the count value i by 1 from the address a [5] (step 104, 106).

Next, the controller 62 determines whether the count value i is less than 20 (step 108). If the judgment result count value i in this step 108 is less than 20, the process returns to step 104 above and repeats the subsequent process, and the judgment result count value i in step 108 is 20 If not smaller, i.e., i is determined to be 20, the total length L is increased to 20 (step 110).

Then, as can be seen from FIG. 5, the information of the header portion of the CPS message (information identifier 51, extension bits, sign standard 52, information instruction 53 and information length 54) is four octets. Therefore, the rest of the information length except for this is L-4, therefore, in order to divide the remaining information length into two octets, and to form the information length in octets in more detail, the logical product of L + 4 and 1111111100000000 Result in 8-bit shift to the right), and the result value is stored in the address a [2] in the storage unit 63. Then, the logical product operation of L + 4 and 0000000011111111 (substantially 8 to the left) is performed. The result of the bit shift), and then the address is assigned to the result value and stored in the address a [3] in the storage section 63 (step 112).

As described above, the conversion of the message information generated in byte units by operation into octets is because data processing is performed in byte units (16 bits) in the PC, but in octet units (8 bits) in the ATM communication protocol. to be.

As described above, the generation process of the CPS message is completed by generating the sub address information according to the method of the present invention, giving the address start address, and storing the sub address information in the storage unit 63 together with the length of the octet message.

Accordingly, the controller 62 detects the address start address and the message length of the CPS message according to the present invention, which is generated through the above-described process and stored in the storage unit 63, and then provided to the address and length detection unit 64. CPS message information is delivered to the called user through the omitted ATM network.

As described above, according to the present invention, it is possible to efficiently and quickly generate a call party sub-address message used to distinguish the sub-address connected to the requesting party.

Claims (5)

A method of generating a call party sub-address message used to distinguish a sub-address connected to a requesting party in an asynchronous transmission mode, the content of an information identifier, a code standard, and an information command message based on bit information provided from an information park. A first step of generating the data and storing the same at a predetermined address of the memory; Based on the bit information provided from the information park, a predetermined call party sub-address message is generated through a repetitive operation for a predetermined number of times, and the address start address and total length information of the newly generated message are sequentially added to the predetermined address of the memory. A second process of storing as; In the asynchronous transmission mode comprising a third step of detecting and outputting the start address information of the address for the call party sub-address message and the total length information for the newly generated message generated through the second process; How to generate a call party sub address message. The method of claim 1, wherein the message generating method further comprises the step of converting the call party sub-address message generated in bytes into 8-bit octets. How to generate an address message. The method as claimed in claim 2, wherein the converting process converts the call party sub-address information excluding the header information in octet units. 3. The method as claimed in claim 2, wherein the converting process converts the message by shifting each bit 8 bits to the right and to the left, respectively. 5. The method as claimed in any one of claims 1 to 4, wherein the first step and the second step further comprise generating an extension bit, respectively.