KR0134442B1 - Method for detecting clock recovery type within aal parameter message in atm - Google Patents

Abstract

In the present invention, the Asynchronous Transmission Mode (abbreviated as ATM), in particular, detects the clock recovery format information in the AAL parameter message in the setup message included in the broadband sublayer information in the Q.93B protocol. The present invention relates to a method for receiving a setup message or an add party message inputted from an information park, storing it in a predetermined address of a memory, and storing length information of two octets for the setup message or add party message. Detecting and storing the information identifier at a predetermined address of the memory, continuously increasing the counter value set to a predetermined value by one to recognize an AAL parameter message, which is variable length information following the header information of the corresponding message. Determination process, information identification of AAL parameter message Is determined, the length information of the two octets is detected and stored in a predetermined address of the memory, and the octet length of the header information located at the tip is added to find the corresponding octet including the AAL format information in the AAL parameter message. Updating the counter value by setting the value to 0, and performing a logical multiplication operation between the corresponding octet information and an arbitrary bit value stored in the memory to detect the AAL type information from the corresponding octet obtained in the updating process. In order to recognize the AAL format -1 clock recovery format information of the next content, which is based on the contents information, a process of discriminating its information identifier while continuously increasing the counter value set to a predetermined value by 1, and through this determination process, In the AAL format-1, the content information obtained, a plurality of pieces of information on the clock recovery format of the octet following the information identifier. After determining each type and outputting service information corresponding to the type and providing it to the network, the terminal detects the clock recovery type information in the AAL parameter message efficiently and promptly. By providing to the real time concept, the effective message interface between the terminal and the network is realized.

Description

How to detect clock recovery type messages in ATM adaptive layer parameter messages 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 of a message type of a general Q.93B protocol.

4 is a diagram showing the configuration of a setup message and an ad party message according to the present invention.

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

6 is a format diagram of a general AAL parameter message type according to the present invention.

7 is a view showing various types of AAL format information included in an AAL parameter message related to the present invention.

8 is a data format diagram for an AAL format-1 message followed by the content information based on the AAL format information.

9 is a format diagram for each piece of information having various types of values included in the AAL format-1 message related to the present invention.

10 is a data format diagram for an AAL format-3/4 message following the content information based on the AAL format information.

11 is a data format diagram for an AAL format-5 message followed by the content information based on the AAL format information.

12 is a data format diagram for a user-defined AAL message that follows the content information based on the AAL format information.

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

14 is a flowchart illustrating a process of detecting clock recovery format (CRT) information included in an AAL parameter message according to a preferred embodiment of the present invention.

15 is a diagram illustrating an address used to describe a process of detecting clock recovery format information (CBR) according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: information provider 10a: ATM

10b: AAL type 5, 12: control unit

14: storage unit

The present invention relates to ATM adaptation layer parameters included in the broadband sublayer information in the asynchronous transmission mode (abbreviated to ATM), in particular in the Q.93B protocol. Abbreviated) The present invention relates to a method for detecting a clock recovery type (hereinafter abbreviated as CRT) message in a message.

In general, ATM is a communication method for implementing a Broadband Integrated Service Digital Network (hereinafter, abbreviated as BISDN), and is a special type using an asynchronous time division multiplexer (abbreviated as ATDM). Packet-type 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. More specifically, the ATM cell divides a plurality of service information 11 having a predetermined bit rate (identity bit rate, variable bit rate, etc.) into short cells 12 of fixed length, as shown in FIG. After that, each cell is packetized by attaching 5 bytes of header information (12a) to each cell. Each ATM cell has a total of 53 bytes (data information 48 + header information 5). Each of these ATM cells, as shown at the bottom of FIG. 1, is multiplexed 13 and transmitted to a terminal or network via a transport channel.

In addition, the ATM cell as described above is a connectivity method, and establishes a virtual channel to transmit service information. Whenever a 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 method as described above defines a layered protocol reference model for systematic and flexible information transfer. At this time, the protocol layer envisioned is, as shown in Figure 2, the physical layer 21, ATM system

The layer 22, the ATM adaptation layer 23 and the upper layer 24, etc. will be described in detail 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 the control plane (B) and the user plane (C) is divided into a higher layer 24, an ATM adaptation layer (AAL) 23, an ATM layer 22, a physical layer 21, and the like. Although not shown in the figure, the ATM adaptation layer 23 is classified into a resin and the ATM cell by cutting the convergence sublayer and the protocol data unit, which makes the user service information of the upper layer 24 into the protocol data unit, to a predetermined size. It consists of a cut and a recombination layer forming a user information section of.

In addition, when the ATM adaptation layer 23 is horizontally classified, the U-SDU (service data unit) having an equal bit rate is transmitted between the information source and the destination at the same bit rate along with related time information, and recovery errors and unrecovered. AAL-1, real-time U-SDU, which provides services such as error indication to the upper layer protocol 24 shown in FIG. AAL-2, Equal Bit Rate, which provides services such as error recovery and unrecovered error indication to the upper layer protocol 24, and provides the function of partitioning and reassembling user information. AAL-3 / 4 and communication protocols that provide the ability to deliver this variable service data in a connected or disconnected manner are complex, resulting in high speed data transmission. To be inappropriate by the AAL-3/4 functions simplifies and AAL-5, which provides high-speed data transmission function in the.

Here, the interface of the signaling message between each terminal and the network is processed through the AAL-5 having a high speed data transfer function, which is one of the horizontal classification of the ATM adaptation layer 23 described above.

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 transport convergence sublayer and a physical medium sublayer, and performs cell separation, generation and verification 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, call setup messages are subdivided into call processing, connection, connection recognition, call setup, etc., call information messages are subdivided into call resume, resume recognition, etc., and call release messages are 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 protocol discriminator 31, user-to-manganese interface for discriminating the user-to-manganese call control message from other messages, as shown in FIG. Call reference signal (32), message type signal (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.

Practically, the user-to-many ATM call and connection control messages as described above are call eatablishment messages and include call progress, connect, connect acknowledge, and setup messages. There are RELEASE and RELEASE COMPLETE messages as Call clearing messages, and Status and STATUS ENQUIRY messages as Miscellaneous messages.

Herein, the present invention is included in the above user-to-many ATM call and connection control message, and the other interface for the setup message and the call sent by the calling user to the network or to the called user in the network to initialize the call setup. Relates to at-party messages sent to or received from other interfaces.

On the other hand, as described above, the setup message related to the present invention, as shown in Figure 4 (a), protocol identification signal of 1 octet, call reference signal of 4 octets, message format of 2 octets and It consists of a header information message consisting of a message length and a variable length information message that is variably included as necessary. The variable length information includes, for example, an AAL parameter message, a broadband transport capacity message, a broadband upper layer information message, a call party number message, and a connection. There is an identification message and the like, and each of the variable length information has the same or different respective values.

On the other hand, as described above, the ADD PARTY message related to the present invention includes a protocol determination signal of 1 octet, a call reference signal of 4 octets, and an octet of 1 octet, as shown in FIG. It consists of a header information message consisting of a message format and a message length of 2 octets, and a variable length information message that is variably included as necessary. Examples of the variable length information include an AAL parameter message, a broadband lower layer message, a broadband upper layer information message, There is a calling party number message and a called party number message. Each of the variable length information has the same or different respective values.

On the other hand, as shown in FIG. 3, the general variable length information 35 included in the user-to-many ATM call and connection control message and optionally required for each function in each of the setup message and the ad-party message as described above 35 ) Denotes an information identifier 51, a coding standard 52, an information element instruction 53, an information length 54, and an information content (). 55).

In particular, the AAL parameter message, which is included in the variable length information described above and included in the setup message and the Ed-party message, which is substantially related to the present invention, is a wideband lower part composed of an 8-bit octet of 01011000, as shown in FIG. Information element identifier (61) of AAL parameter message in hierarchical information, CCITT standardized coding standard (62) consisting of 2 bits of 00, unspecified information element instruction consisting of 5 bits of 00000 field) (63), which consists of two octets, the length of contents (64) representing the length of the AAL parameter content in the broadband sublayer information, and one octet including the extension bits, which is the AAL format of the message. And AAL format information 65 indicating various information contents 66 corresponding to each AAL format.

On the other hand, in the AAL parameter message having the above-described form, the AAL format information 65 located in octet 5 is divided into four types of information having different values, as shown in FIG. That is, AAL format information 65 consists of AAL format consisting of bit '0000001'-1, AAL format consisting of bit '0000011'-3/4, AAL format consisting of bit '0000101'-5, bit '0010000' The information content 66 according to the AAL parameter format information, which is divided into user definitions, is substantially as shown in FIGS. 8, 9, 10, and 11.

That is, if the AAL format information 65 is AAL format-1, that is, the bit information value is '0000001', the information content 66 is negative, consisting of 8 bit octets of '10000101', as shown in FIG. A constant bit rate identifier 83 consisting of a subtype identifier 81, a subtype 82, an 8-bit octet of '10000110', an equal bit rate 84, a multiplier identifier 85 Multiplier 86 representing an integer representation of multiplier values between 2 and 216-1, a clock recovery type identifier 87 consisting of an 8-bit octet of '10001000', a clock recovery type ( 88), an error correction identifier 89 consisting of 8-bit octets '10001001', an error correction format 90, and a structured data transfer identifier consisting of 8-bit octets '10001010' (91). ), An integer representation of the number of structural data transmissions (92) and leading octets. Partially filled cells identifier 93, which indicates a partially filed cell (94).

On the other hand, as described above, in the information content 66 when the AAL format information 65 in the AAL parameter message is AAL format-1, that is, the bit information value is '0000001', the subformat 82 is the ninth. As shown in (a), if the bit value is '00000000', null / empty is used. If the bit value is '00000001', the voice band is based on 64 kbit / s. ), If the bit value is '00000010', then the circuit emulation (synchronous), if the bit value is '00000011', then the circuit emulation (asynchronous), the corresponding bit value If '00000100' indicates high quality audio and if the corresponding bit value '00000100' indicates video, respectively.

Further, in the information content 66 when the AAL format information 65 in the AAL message is AAL format-1, that is, the bit information value is '0000001', the identity bit rate 84 is shown in Fig. 9B. As shown, if the corresponding bit value is '00000001', it means 64 kbit / s, if the corresponding bit value is '00000100', it is 1544 kbit / s (DS1); if the corresponding bit value is '00000101', 6312 kbit / s (DS2) If the bit value is '00000110', it means 32064 kbit / s.If the bit value is '00000111', it means 44736 kbit / s (DS3) .If the bit value is '00001000', it means 97728 kbit / s. Is '00010000', it is 2048 kbit / s (E1), if the bit value is '00010001', it is 8448 kbit / s (E2), and if the bit value is '00010010', it is 34368 kbit / s (E3). If the value is '00010011', it means 139264 kbit / s, and if the corresponding bit value is '01000000', it indicates n × 64 kbit / s.

On the other hand, in the information content 66 when the AAL format information 65 in the AAL parameter message is AAL format-1, that is, the bit information value is '0000001', the clock recovery format to be detected substantially in accordance with the present invention ( 88), as shown in FIG. 9 (C), if the corresponding bit value is '00000000', null, and if the corresponding bit value is '000000000000', SRTS (Synchronous Residual Time Stamp) is used. '00000010' indicates adaptive clock recovery.

In the information content 66 when the AAL format information 65 is AAL format-1, that is, the bit information value is '0000001', the error correction format 90 is as shown in FIG. Likewise, if the corresponding bit value is '00000000', it indicates a blank, and if the corresponding bit value is '000000000000', it indicates interleaving forward error correction. Here, when the bit value of the error correction format 90 is '00000001', the code point excludes the specification of the SDT in the structural data transfer information 92 described below.

Further, in the information content 66 when the AAL format information 65 is AAL format-1, that is, the bit information value is '0000001', the structured data transmission 92 is as shown in FIG. Likewise, if the corresponding bit value is '00000000', it indicates a blank, and if the corresponding bit value is '000000000000', it indicates structural data transmission. Here, when the bit value of the structural data transmission information 92 is '00000001', the code point excludes the use of interpolation FEC in the error correction format 90 described above.

On the other hand, as described above, if the AAL format information 65 is AAL format-3 / 4, that is, the bit information value is '0000011', the information in the information is in the information.

The application 66 is a received maximum Common Part Convergence Sublayer (CPCS) -SDU (Service Date) consisting of an octet of '10000001' representing a 16-bit integer representation of a value between 1 and 65535, as shown in FIG. Unit) MID size identifier 103 indicating an integer representation of the number of message identifiers (MID) consisting of a size identifier 101, a received maximum CPCS-SDU size 102 consisting of two octets, an 8 bit octet of '10000010', SSID (Service Specific) consisting of MID size 104 consisting of two octets, mode identifier 105 consisting of 8 bit octets of '10000011', mode 106 consisting of 8 bit 1 octets, and 8 bit octets of '10000100' Convergence Sublayer) consists of an SSCS format 108 consisting of a type identifier 107 and one octet of 8 bits.

In addition, in the information content of the AAL format-3/4 having the format as described above, the mode 106 information is 1 to 8 in the case of the message mode, as shown in FIG. It consists of a bit octet and in the streaming mode it consists of 10 8 bit octets.

Furthermore, in the information content of the AAL format-3/4 as described above, the SSCS format 106 information consists of zero 8-bit octets when blank, as shown in FIG. Guaranteed operation consists of 1 for data SSCS based on Service Specific Connection Oriented Peer-to-Peer Protocol (SSCOP) and 10 for data SSCS based on non-guaranteed operation SSCOP and frame relay ) In case of SSCS, it is 100.

On the other hand, as described above, if the AAL format information 65 is AAL format-5, that is, the bit information value is '0000101', the information content 66 has a logic '10000001' as shown in FIG. Receive Max CPCS-SDU Size Identifier (111) consisting of, Receive Max CPCS-SDU Size (112), Mode identifier (113) consisting of 8-bit octet of '10000011', Mode (114) consisting of 8-bit 1 octet, ' It consists of an SSCS type identifier 115 consisting of an 8 bit octet of 10000100 ', and an SSCS type 116 consisting of an 8 bit of 1 octet.

Furthermore, in the information content of the AAL format-5 having the format as described above, the mode 114 information is similar to the mode 106 information in the AAL format-3/4 described above. F) substantially the same as shown in FIG. 9, and in the information content of the AAL format-5, the SSCS format 116 information is the same as the SSCS format 108 information in the AAL format-3 / 4 described above. It is substantially the same as shown in FIG.

Further, as described above, if the AAL format information 65 is AAL format-5, that is, the bit information value is '0010000', the information content 66 is a user of 4 octets, as shown in FIG. Definition Consists of ATM Adaption Layer (AAL) parameter information.

Herein, the present invention includes content information as shown in FIG. 8, which is included when the AAL format minus one, that is, the bit information value is '0000001', among the plurality of content information according to the AAL format information as described above. It relates to a method for quickly detecting a CRT message.

However, as described above, among the variable length messages required for each function, the other interface for calling and setup messages sent by the calling user to the network or to the called user in the network to initiate call setup in the Q.93B protocol. There has been no description on how to effectively detect the CRT message in the AAL parameter message included in the at-party message sent to or received from the other interface, or a device for realizing this.

Accordingly, the present invention provides a method for efficiently detecting CRT information in AAL format-1 in the AAL parameter message included in the broadband sublayer information in the Q.93B protocol and optionally included in the setup message and the add-party message. Its purpose is to.

Another object of the present invention is to provide a message detection method that can efficiently determine an error of CRT information in AAL format-1 in an AAL parameter message and quickly provide corresponding service information to a network.

According to one aspect of the present invention for achieving the above object, the clock recovery information in the AAL parameter message included in the setup message and the ad-party message in the ATM cell provided to the corresponding terminal in the network through the transport channel in the asynchronous transmission mode, respectively. In the detecting method, the setup message or the ad party message inputted from the information park is received and stored in a predetermined address of the memory, and the length information of 2 octets for the setup message or the ad party message is detected and the memory is stored. In the first step of storing at the predetermined address of the first address, the information identifier is continuously increased while increasing a counter value set by a predetermined value by one to recognize the AAL parameter message, which is variable length information following the header information of the corresponding message. The second process of determining, the AAL para A third step of detecting the length information of the two octets and storing the length information of the two octets in a predetermined address of the memory when the information identifier of the first message is determined, and located at the front end thereof to find a corresponding octet including AAL format information in the AAL parameter message. A fourth step of updating the counter value by setting the octet length of the header information to an added value, and stored in the corresponding octet information and the memory to detect the AAL type information in the corresponding octet obtained in the fourth step. A fifth step of performing an AND operation with an arbitrary bit value, wherein the counter value is set to a predetermined value to recognize clock recovery type information of AAL type-1 of the next octet based on the AAL type information; A sixth process of discriminating the information identifier thereof in successive increments, and the contents obtained through the sixth process AAL in the asynchronous transmission mode consisting of a seventh process of determining each of a plurality of types of clock recovery form information of the octet next to the information identifier in the information AAL format-1 and then outputting the service information corresponding to the corresponding type to provide to the network. A method of detecting clock recovery format messages in parameter messages is provided.

On the other hand, in the message detection method of the present invention as described above, the first step further comprises the step of converting the length information of the two octets in the detected setup message or the ad party message into an integer unit, the third process The method further includes converting length information of two octets of the detected AAL parameter message into an integer unit.

According to another aspect of the present invention for achieving the above object, the clock recovery format information in the AAL parameter message included in the setup message and the ad-party message in the ATM cell provided to the corresponding terminal in the network through the transport channel in the asynchronous transmission mode, respectively. In the method for detecting, receiving the setup message or the ad party message input from the information park and store in a predetermined address of the memory and then detects the length information of the two octets for the setup message or the ad party message In the first step of storing at a predetermined address of a memory, the information identifier is continuously increased while increasing a counter value set by a predetermined value by 1 to recognize the AAL parameter message, which is variable length information following the header information of the setup message. 2nd process to determine the phase Comparing a counter value with a length information value of the setup message or an ad party message, and outputting service information for notifying occurrence of a message error to the network when the counter value exceeds the length information value of the corresponding message; A fourth process of detecting length information of two octets of the AAL parameter message and storing the length information of two octets in the AAL parameter message when the counter value does not exceed the length information value of the corresponding message; A fifth step of updating the counter value by setting an octet length of header information located at a leading end thereof to find a corresponding octet including AAL format information in the AAL parameter message; In order to detect the AAL type information in the oct. A sixth step of performing an AND operation on the information and an arbitrary bit value stored in the memory, to recognize the clock recovery format information in an AAL format-1 message of the next octet, which is content information based on the AAL format information; A seventh step of discriminating the information identifier by continuously increasing the counter value set to a predetermined value by one, the clock of the octet following the information identifier in the AAL format-1, which is the content information obtained through the seventh process; Determining the plurality of types of recovery type information, and outputting service information corresponding to the type and providing the service information to the network; and the clock recovery type information detected as a result of the type determination in the eighth step. Service information for notifying occurrence of a message error if not included in each type A method for detecting a clock recovery type message in an AAL parameter message in an asynchronous transmission mode comprising a ninth process is provided.

On the other hand, in the message detection method of the present invention as described above, the seventh step, if the AAL format of the next octet based on the AAL format information is not AAL format-1, the service information for notifying occurrence of a message error is outputted. It further includes the process of providing to the network.

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.

13 is a schematic block diagram of a hardware system for detecting CRT information in an AAL parameter message according to the present invention.

As shown in the figure, the hardware system for detecting CRT information according to the present invention is composed of an ATM (10a) and AAL format 5 (10a), the information on the Q.93B protocol input through the transport channel not shown In particular, the Q.93B information providing unit 10 provides a setup message and an ad party message related to the present invention, and receives information about the Q.93B protocol from the information providing unit 10 according to the present invention. Control unit 12, which controls the detection of CRT information included in AAL format-1, which is variable length information in the message, and outputs service information corresponding to the detected CRT information to the network. And a storage unit 14 for storing information about the CRT message in the AAL parameter message detected by (12).

In FIG. 13, the control unit 12, as shown in FIG. 3, in the ATM cell provided from the Q.93B information providing unit 10 at the time of the interface for communication between each terminal and the network, Protocol determination signal 31 for determining a user-network call control message, a call reference signal 32 for detecting a call destination which transmitted a message of a user-network interface, a message format signal 33, a message length signal ( 34) after receiving the information regarding the basic configuration for the message about the general Q.93B, and receiving the information about the broadband lower layer, the AAL parameter message about the broadband lower layer information, i.e. As shown in FIG. 8, the CRT information 84 is detected from the content information 66 shown in FIG. 8 and added to the AAL format 65 in the AAL parameter message. do.

Therefore, the controller 12 reads out the service information corresponding to the CRT included in the AAL parameter message of the detected broadband lower layer information and outputs the service information, thereby effectively performing an interface between the network and the corresponding terminal through a transport channel (not shown).

Next, a preferred embodiment of the present invention for detecting CRT information included in content information in an AAL parameter message as described above will be described in detail with reference to FIG.

FIG. 14 is a flowchart illustrating a process of detecting CRT information included in AAL format-1, which is content information in an AAL parameter message of broadband lower layer information, according to the present invention.

First, as can be seen from the diagram, the SETUP message and the ad party message are transmitted from the network (not shown) that receives the SETUP message or the ad party message from the calling user, and the information providing unit 10 of the called user side is provided. When received by the control unit 12, the control unit 12 stores the SETUP message and the ad party message in the storage unit 14 (step 200).

Next, the controller 12 determines whether the message format information located in the octet 5 of the message stored in the storage 14 is number 5 or 128, that is, whether the message format information is '00000101' or '10000000'. It is determined whether or not (step 202). The reason for checking the message format information in this step 202 is that the message format information is 2 octets for the setup message and the format information is 1 octet for the ad party message, so the actual header information (protocol discriminator, Information about the call reference, message format, and message length).

Then, as a result of the determination in step 202, if the message format information is number 5, i.e., '00000101', the control unit 12 moves from address m [0] to m [6], as shown in FIG. The dummy value a = m [7] is set in consideration of the storage of 7 octets of header information, that is, the protocol discrimination signal of 1 octet, the call reference signal of 4 octets, and the message format information of 2 octets included in the setup message. Next, shift the value of a 8 times to the left (actually 8 bits to the left of the upper octet of the setup message length information) to form the setup message information of the oct unit in the integer unit (16 bits). Address the result value, i.e., the setup message length information value of one octave, and store it in address m [7] in the storage unit 14, as shown in FIG. Is stored at the next address m [8] (step 2). 04). Thus, the message length of the two octets for the setup message is Ls = a + m [8].

Therefore, the header information (meaning from the protocol determination signal to the message length information) included in the setup message is stored at the predetermined address in the storage unit 14 through the above-described process according to the present invention.

Then, the control unit 12 sets the counter C to 9 (step 206). Here, the reason for setting the counter C to 9 is that the message length information is detected as described above in addition to the protocol determination signal of 1 octet, the call reference signal of 4 octets, and the message format information of 2 octets, which are header information of the above-described setup message. This is taken into account since the data is stored in the storage unit 14.

On the other hand, if the message format information is No. 128, that is, '10000000' as a result of the determination in step 202, the control unit 12, as shown in Fig. 15, from address m [0] to m [ 5] Up to 6 octets of header information, that is, one octet protocol discrimination signal included in the ad party message. In order to store the call reference signal of 4 octets and the message format information of 1 octet, the dummy value a = m [6] is set and then the ad party message information of the octet unit is formed into an integer unit (16 bits). , the value of a is shifted 8 times to the left (which is actually the result of shifting the upper octet of the ad party message's length information 8 bits to the left) and addresses the result value, that is, the ad party message length information value of 1 octet. As shown in FIG. 15, the data is stored at the address m [6] in the storage unit 14, and the length information of the next octet is stored at the next address m [7] (step 208). Thus, the message length of the two octets for the ad party message is Ls = a + m [7].

Therefore, the header information (meaning from the protocol determination signal to the message length information) included in the ad party message is stored at the predetermined address in the storage unit 14 through the above-described process according to the present invention.

Then, the controller 12 sets the counter C to 8 (step 210). Here, the reason for setting the counter C to 8 is because the message length information as described above in addition to the protocol identification signal of 1 octet, the call reference signal of 4 octets, and the message format information of 1 octet, which are header information of the ad party message described above. Is taken into account since is detected and stored in the storage unit 14.

Therefore, after the message length information of the setup message or the ad party message is stored in the storage unit 14 through the above-described process, the controller 12 continuously scans the input cell information to obtain the address m [C] value. 88, i.e., the information identifier 61 is checked while incrementing the counter value C by 1 in order to check for detection of the 01011110 bit indicating the information identifier 61 of the AAL parameter message which is variable length information of the setup message or the ad party message. (Steps 212 and 214). These steps 212 and 214 may be substantially the process of finding an AAL parameter message in a setup message or an add party message.

Next, if the AAL parameter information identifier is detected as a result of the check in step 212, control unit 12 again determines whether the detected counter C value is greater than the total length Ls of the message (step 216).

As a result of the determination in the step 216, if the counter C value is not greater than the total length Ls of the message, the control unit 12, as shown in FIG. 6, octets 1 and 2 of the AAL parameter message (information identifier 61). , Which corresponds to the code standard 62 and the information command 63), sets the dummy value a = m [C + 2], and then integrates the AAL parameter information of the setup message or the add-party message in the octet unit. To form a unit (16 bits), the value of a is shifted 8 times to the left (actually the result of shifting the upper octets of the length information of the AAL parameter message 8 bits to the left), that is, 1 octet. The AAL parameter message length information value is assigned to and stored at a predetermined address of the storage unit 14 as shown in FIG. 10, and the length information of the next octet is stored at m [3] at the next address ( Step 218). Thus, the message length of the two octets for the AAL parameter message is La = a + m [3].

Therefore, the header information (meaning from the information identifier to the message length information) included in the AAL parameter message is stored at the predetermined address in the storage unit 14 through the above-described process according to the present invention.

Then, the control unit 12 considers the header information of the AAL parameter message (oct 1 to oct 4) in order to obtain the AAL format 65 information included in the oct 5 to be detected in the AAL parameter message according to the present invention. After updating the counter C to C + 4 (step 220), the controller 12 performs an AND operation on m [C] and the logical value 0000000001111111 (step 222). Thus, the information of octet 5 remains only 7-bit AAL format 65 information excluding the extended bit.

Next, the control unit 12 checks whether the AAL format information of the octet 5 is AAL format-1, that is, the information value is 1, as shown in FIG. 7 (step 224). If the value is AAL format-1, the control unit 12 continuously scans the inputted cell information to retrieve the address m [C] value of 136, i.e. 10001000 indicating the CRT information identifier 87 of AAL format-1 in the AAL parameter message. In order to check the detection of the bit, the CRT information identifier 87 is checked while the counter value C is successively increased by one (steps 226 and 228). These steps 226 and 228 may be substantially a process of finding a CRT information identifier of AAL format-1 according to AAL format information of an AAL parameter message included in a setup message or an ad party message, respectively.

Then, if the CRT information identifier 87 is detected as a result of the check in step 226, the controller 12 determines the type of CRT 88 information following the detected CRT information identifier 87 information. (Step 230).

Accordingly, the present invention detects the CRT information in the AAL parameter message through the above-described calculation process, and as a result, the user can efficiently detect the type of CRT information and the corresponding clock recovery format. Information can be provided to the network.

More specifically, the control unit 12 determines the type of the CRT information 88 corresponding to the AAL format-1 in the AAL parameter message as described above (step 230), and the information value is shown in FIG. In the case of 00000000 indicating empty, (step 232), service information corresponding to the clock recovery format is outputted to the network (step 242), and the information value is a synchronous residual time stamp (SRTS). In the case of 1 (step 234), the service information corresponding to the clock recovery format is output to the network (step 254). If the information value is 00000010 indicating that the ACR (adaptive clock recovery) is performed (step 236), service information corresponding to the clock recovery format is output and provided to the network (step 254).

On the other hand, if it is determined in the step 230 that the corresponding bit value of the detected CRT information is a value other than the three types described above (step 240), the controller 12 indicates a CRT error. The service information for the bet is output and provided to the network (step 242).

On the other hand, if the counter C value in the above-described determination step 216 is greater than the total length Ls of the message, the process proceeds directly to the above-described step 240, and the control unit 12 receives the CRT message error as described above. Outputs the service information for informing that the occurrence of the message has occurred and provides it to the network (step 242). In addition, if the detected AAL format information is not AAL format-1 as a result of the determination in step 224 described above, the process proceeds to the above-described step ( In step 240, the control unit 12 outputs service information for notifying that a CRT message error has occurred and provides it to the network (step 242).

As described above, according to the message detection method of the present invention, the terminal transmits to the other interface or sends to the other interface for the setup message or the call sent by the calling user to the network or the network to the called user to initialize the call setup. Based on the message format information in the AAL parameter message included in each at-party message received from the AAL format-1, the CRT information is efficiently and quickly detected in the message, and corresponding service information is provided to the network. It is possible to realize effective message interface of real time concept between network and network.

Claims (25)

A method for detecting clock recovery format information in an AAL parameter message included in a setup message in an ATM cell and an ad party message provided to a corresponding terminal in a network through a transport channel in an asynchronous transmission mode, the method being input from an information park. A first step of receiving the setup message or the add party message and storing the received message at a predetermined address of the memory, and then detecting and storing the length information of the two octets of the setup message or the add party message at the predetermined address of the memory; A second step of discriminating the information identifier by successively increasing the counter value set to a predetermined value by 1 to recognize the AAL parameter message which is variable length information following the header information of the corresponding message; If the information identifier of the AAL parameter message is determined, detecting the length information of the second octet and storing the length information of the second octet in a predetermined address of the memory; A fourth step of updating the counter value by setting an octet length of header information located at a leading end thereof to find a corresponding octet including AAL format information in the AAL parameter message; A fifth step of performing an AND operation on the oct information obtained in the fourth step to detect the AAL format information and the bit value stored in the memory; A second number for discriminating the information identifier while continuously increasing the counter value set by a predetermined value by one so as to recognize the clock recovery type information of AAL type-1 of the next octet which is content information based on the AAL type information. 6 courses; And determining each of a plurality of types of the clock recovery type information of the octet next to the information identifier in the AAL format-1, which is the content information obtained through the sixth process, and outputting service information corresponding to the corresponding type to provide to the network. A method for detecting a clock recovery type message in an AAL parameter message in an asynchronous transmission mode comprising a seventh step. The AAL parameter message of claim 1, wherein the first process further comprises converting length information of two octets in the setup message or the ad party message into an integer unit. A method for detecting clock recovery format messages in a message. The method of claim 2, wherein the length information of the second octet is converted into an integer unit by shifting the upper octet eight times to the left. 2. The method of claim 1, wherein the second process sets the counter value to a value corresponding to an octal number of header information of the setup message. . 5. The method of claim 4, wherein the number of octets of header information of the setup message is 9 octets. 2. The method of claim 1, wherein the second process sets the counter value to a value corresponding to an octal number of header information of the ad party message. Way. 7. The method of claim 6, wherein the number of octets of header information of the ad party message is 8 octets. The method of claim 1, wherein the third process further comprises converting length information of two octets of the detected AAL parameter message into an integer unit. Message Detection Method. 9. The method of claim 8, wherein the length information of the second octet is converted into an integer unit by shifting the upper octet eight times to the left. 2. The method of claim 1, wherein the header information octet of the AAL parameter message is 4 octets in the fourth process. The method of claim 1, wherein the arbitrary bit value used for the AND operation in the fifth process is 0000000001111111. 2. The method of claim 1, wherein the plurality of types of clock recovery format information are information including binary 00000000, binary 00000001, and binary 0000010, respectively. A method for detecting clock recovery format information in an AAL parameter message included in a setup message and an ad party message in an ATM cell provided to a corresponding terminal in a network through a transport channel in an asynchronous transmission mode, the method being input from an information park. A first step of receiving the setup message or the add party message and storing the received message at a predetermined address of the memory, and then detecting and storing the length information of the two octets of the setup message or the add party message at the predetermined address of the memory; A second step of discriminating the information identifier by successively increasing the counter value set to a predetermined value by 1 to recognize the AAL parameter message which is variable length information following the header information of the corresponding message; Comparing the counter value with the length information value of the setup message or the ad party message and outputting service information for notifying occurrence of a message error to the network when the counter value exceeds the length information value of the corresponding message. Third process; If the information identifier is determined while the counter value does not exceed the length information value of the corresponding message, detecting a length information of two octets of the AAL parameter message and storing the detected length information in a predetermined address of the memory; A fifth step of updating the counter value by setting an octet length of header information located at a leading end thereof to find a corresponding octet including AAL format information in the AAL parameter message; A sixth step of performing an AND operation on the octet obtained in the fifth step to detect the AAL format information on the corresponding octet and the arbitrary bit value stored in the memory; Determining the information identifier by successively increasing the counter value set by a predetermined value by one to recognize the clock recovery format information in the next octal AAL format-1 message which is content information based on the AAL format information. The seventh process; Determining a plurality of types of the clock recovery type information of the octet next to the information identifier in the AAL format-1, which is the content information obtained through the seventh process, and outputs service information corresponding to the corresponding type and provides them to the network. Eighth process; And a ninth process of outputting service information for notifying occurrence of a message error if the clock recovery format information detected as a result of the type determination in the eighth process is not included in each of the plurality of types. To detect the clock recovery format message in the AAL parameter message. 15. The AAL parameter message of claim 13, wherein the first process further comprises converting length information of two octets in the setup message or the ad party message into an integer unit. A method for detecting clock recovery format messages in a message. 15. The method of claim 14, wherein the length information of the second octet is converted into an integer unit by shifting the upper octet eight times to the left. 14. The method of claim 13, wherein the second process sets the counter value to a value corresponding to the number of octets of header information of the setup message. . 17. The method of claim 16, wherein the octet number of header information of the setup message is 9 octets. 14. The method of claim 13, wherein the second process sets the counter value to a value corresponding to the number of octets of the header information of the ED party message. Way. 19. The method of claim 18, wherein the number of octets of the header information of the ED party message is 8 octets. The clock recovery of the AAL parameter message in the asynchronous transmission mode according to claim 13, wherein the fourth process further comprises converting length information of two octets of the detected AAL parameter message into an integer unit. Format message detection method. 21. The method of claim 20, wherein the length information of the second octet is converted into an integer unit by shifting the upper octet eight times to the left. 14. The method of claim 13, wherein the header information octet of the AAL parameter message in the fifth process is four octets. 15. The method of claim 13, wherein an arbitrary bit value used for the AND operation in the sixth step is 0000000001111111. 14. The method of claim 13, wherein the seventh step outputs service information for notifying occurrence of a message error to the network when the AAL format of the next octet, which is content information based on the AAL format information, is not AAL format-1. A method for detecting a clock recovery type message in an AAL parameter message in an asynchronous transmission mode, further comprising a process. 15. The method of claim 13, wherein the plurality of types of clock recovery format information are information including binary 00000000, binary 00000001, and binary 00000010, respectively.