KR0128869B1 - Method for generating a call state message in atm - Google Patents

Abstract

Call state message of Asynchronous Transfer Mode is generated by following method; (a) Information discriminator having the preset length according to bit information from information source for call state display, code standard and information command message is generated, which is stored an address of memory. (b) A length state information which will generate from many state information which shows call state according to bit information from information source is addressed on an address of memory. (c) Starting address information for call state message which is generated and stored through each process and total length one for the generated message are detected and so those are output.

Description

How to Generate Call Status Messages in Asynchronous Transfer Mode

According to the present invention, in the asynchronous transfer mode (hereinafter referred to as ATM), a call state (abbreviated as CS) message included in the broadband sublayer information, particularly in the Q.93B protocol, is used. A message generating method suitable for generating.

In general, ATM is a communication type for implementing a Broadband Intergrated 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 attached with (headerinformation) 12a, each ATM cell comprises a total of 53 bytes (data information 48 + header information 5), and each of these ATM cells is shown at the bottom of FIG. As shown, multiplexed 13 is transmitted over the transport channel.

In addition, as described above, the ATM cell 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 configured as shown in FIG. 2 includes the physical layer 21, the ATM layer 22, the ATM adaptation layer 23, the upper layer 24, and the like. As follows.

That is, the protocol reference model of ATM consists of a management plane (A), a control flight number (B), and a user plane (C), and the functions of the management planes (A) among the three planes (A, B, and 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 protocols of the control plane B and the user plane C are divided into the upper layer 24, the ATM adaptation layer 23, the ATM layer 22, the physical layer 21, and the like. Although not shown, the ATM adaptation layer 23 cuts the convergence 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.

The ATM layer 22 translates the user-network connection and information flow, translates the virtual path identification number and the virtual channel identification number, connects with service access points, multiplexes and demultiplexes 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 set up, etc., the call information message is subdivided into call resume, resume recognition, etc., and the call release message is released. Subdivided into return completion, etc. The typical message control format of the ITU-TS Recommendation Q.93B protocol 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 31 for determining the user-to-manage call control message from another message, as shown in FIG. Call reference signal (32), message format signal (message type) 33, and message length signal 34 are respectively basically configured to detect call destinations that have sent messages. The variable length information 35 required according to the function of the control signal message is defined to be included.

The present invention relates substantially to a method of generating a call state (CS) message contained within the variable length information described above and used to indicate the current state of a call destination and earth registration state.

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, a coding standa rd 42, It consists of an information element instruction 43, an information length 44 and an information content 45.

In particular, the CS information included in the variable length information and used to indicate the current state of the call destination and the earth registration state according to the present invention is, as shown in FIG. 5, broadband lower layer information composed of 8-bit octets of 00010100. Information element identifier (51) of the call state in the state, CCITT standardized coding standard (52) consisting of 2 bits of 00, information information instruction field consisting of 5 bits of 00000 (53), consisting of two octets, a length of information (54) representing the length of a call status message in the broadband sublayer information, consisting of an extra bit (55) consisting of two bits of 00 and six bits. Call state value / global interface value 56.

On the other hand, in the call state message of the present invention having the above-described configuration, the call state value information is invalid as shown in FIG. 6A when the information bit value is 000000, and the user state and network state are invalid. It means the state, that is, U0-Null, N0-Null state, when the information bit value is 000001, the user state means that the network state is the initial call state, that is, the U1-Call initiated, N1-Cal initiated state. When the information bit value is 0000 11, it means that the user status and network status are call progress output status, that is, U3-Outgoing call proceeding and N3-Outgoing call proceeding status.When the information bit value is 000110, the user status and network status are It means that the state is the current call state, that is, the state of U6-Call present, N6-Call present.When the information bit value is 001000, it means that the user state and the network state are connection request states, that is, U8-C onnect request, N8-Conect request status.

Further, in the call state value information according to the present invention, when the information bit value is 001001, it means that the user state and the network state are call progress input states, that is, U9-Incoming call proceding and N9-Incoming call proceeding states. When the information bit value is 001 010, it means that the user status and network status are in progress. That is, it means U10-Active and N10-Active status. When the information bit value is 001011, it means that the user status and network status are request to release. That is, it means the U11-Release request and the N11-Release Request status. When the information bit value is 001100, it means that the user status and the network status are the release indication status.

On the other hand, in the call status message of the present invention having the configuration as described above, the earth matched state value information means that it is invalid when the information bit value is 000000, as shown in FIG. That is, it means REST0-Null state, and when the information bit value is 111101, it means a retry request state, that is, it means REST1-Restart request state, and when the information bit value is 111110, it means retry state, that is, REST2-Restart. Means status.

However, among the variable length messages required for each function, the recommendation for the format of the call status (CS) message used to indicate the current state of the call destination and the earth registration state as described above is presently prepared as described above. The method for generating such a CS message or a device for realizing the CS message has not been presented at all until now.

Accordingly, the present invention is a call state used in indicating the current state of the call destination and the earth registration state by being included in the variable length information required according to the function of various control signal messages as wideband lower layer information in the Q.93B protocol in the asynchronous transmission mode. The goal is to provide a way to generate (CS) messages.

In order to achieve the above object, the present invention provides a method for generating a call status message, which is included in the broadband sublayer information in the Q.93B signaling protocol in the asynchronous transmission mode and used to indicate the current state of the call destination and the earth registration state. A first step of generating contents of an information identifier, a code standard, and an information command message having a predetermined length for displaying a call status based on the bit information from the information park and storing the contents at a predetermined address in a memory; A second step of storing, at a predetermined address of the memory, state information of a predetermined length to be generated among a plurality of state information representing a call state based on bit information input from the information park; And a third step of detecting the start address information of the address for the call status message stored in the memory and the total length information of the generated call status message and outputting the information to the transmission channel. Provides a method to generate call status messages in.

In addition, the call status message generating method of the present invention as described above further comprises the step of converting the call status message generated in byte units of 16 bits to 8 bits octet units, the conversion process is substantially The generated call status message is shifted 8 bits to the right and left, respectively, to convert it into octets.

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 status message type generated in accordance with the present invention.

6 shows an example of each piece of information of a call status message generated in accordance with the present invention.

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

8 is a flowchart illustrating a process of generating a CS message according to a preferred embodiment of the present invention.

9 is a diagram illustrating an address used to describe a method for generating a call status message 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

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.

7 is a schematic block diagram of a hardware system for generating a CS message according to 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 CS message generated by the controller 62, and detects and outputs the address and information length of the generated CS message. And an address and length detector 64.

In FIG. 7, 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 which transmitted the message of the user-network interface. 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 20 and store 20 at address a [0] of the storage unit 63 in order to generate the CS 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 00010100. In order to generate the CCITT standardized code standard 52 composed of 2 bits of 00, and the information command 53 composed of 00000, 128 is stored at the address a [1] in the storage 63.

In addition, after generating the CS message according to the present invention after the process described above, the control unit 62 performs a continuous operation, the extra bit 55, the call state value, as shown in FIG. Generate the earth registration value information 56.

Therefore, the message address and length detector 64 detects the address and the information length of the generated CS information message and outputs it to the ATM network so that the CS message of the broadband lower layer information is transmitted to the called user through a transport channel (not shown). Delivered.

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

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

First, as can be seen from the figure, the control unit 62 receives the octet information 20 indicating the CS from the information providing unit 61 and stores it in the address a [0] in the storage unit 63 and the address a [ 1] by storing 128, one octet information identifier 51 consisting of bits 00010100 and one octet extended bit consisting of 10000000 bits, a code standard 52, and an information command 53 are stored. Next, L is set to 5 representing the total length of the CS content information (step 100).

The reason for storing 128 (10000000) in the address a [1] in step 100 is to generate 1, that is, the most significant bit of the 8-bit octet. In this case, the reason for setting the extension bit to 1 is that the following information data exists.

Next, the Sv value is stored at address a [4], more specifically, as shown in Figs. 6 (a) and (b), the current state of the call destination and the earth registration state (user state, network state). Save the value (step 110).

Here, in the state value stored at address a [4], the bit value of the null state is 0 (000000), the bit value of the call initiated state is 1 (000001), and the call start ( Bit value of Outgoing call proceeding status is 3 (000011), Bit value of Call Present status is 6 (000110), Bit value of Connect request status is 8 (001000), Call progress input (Incoming call proceeding) bit value is 9 (001001), active bit value is 10 (001010), release request status bit value is 11 (001011), release indication ) Bit value is 12 (001100), the bit value of the restart request state is 61 (111101), the bit value of the restart state is 62 (111110).

Thus, one of the various types of state values as described above is stored at address a [4] in step 110 above according to the invention.

Then, as can be seen from FIG. 5, the information in the header portion of the CS message (information identifier 51, extension bits, sign standard 52, information instruction 53 and information length 54) is four. Since it is oct, the remaining information length except this is L-4. Therefore, in order to divide the remaining information length into two octets, in order to form the information length in octets in detail, an AND operation with L + 4 and 1111111100000000 (actually a result of 8-bit shifting to the right) is performed. The resulting value is then addressed and stored at address a [2] in storage 63 (step 120), which in turn is the result of an AND operation with L + 4 and 0000000011111111 (substantially an 8-bit shift to the left). ) Is then addressed and stored at address a [3] in storage 63 (step 130).

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

As described above, according to the method of the present invention, the call status (CS) message information used to represent the current state of the call destination and the earth registration state is generated, the address starting address is given, and the storage unit (with the length of the octet message) 63), the process of generating the CS message is completed.

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

As described above, according to the present invention, the ATM Q.93B signaling protocol generates a call status message at high speed, which is included in the broadband lower layer information and used to indicate the current state of the call destination and the earth registration state. The signaling process suitable for .93B signaling protocol can be effectively realized.

Claims (3)

A method of generating a call status message included in broadband sublayer information in a Q.93B signaling protocol in asynchronous transmission mode and used to indicate a current state of a call destination and a global registration state, based on bit information from an information park. Generating a content identifier, a code standard, and an information command message having a predetermined length for displaying a call status and storing the contents at a predetermined address of a memory; A second step of storing, at a predetermined address of the memory, state information of a predetermined length to be generated among a plurality of state information representing a call state based on bit information input from the information park; And a third step of detecting the start address information of the address for the call status message stored in the memory and the total length information of the generated call status message and outputting the information to the transmission channel. How to generate call status messages in. The method of claim 1, wherein the message generating method further comprises the step of converting the call status message generated in byte units of 16 bits into 8 bit octet units. How to generate a message. The method as claimed in claim 2, wherein the conversion process comprises converting the generated call status message to the octet unit by shifting the generated call status message to the right and left by 8 bits, respectively.