KR100810696B1 - 3Ｇ-H.324M protocol and network analysis device - Google Patents

Abstract

The present invention relates to a third generation (3G) communication service infrastructure based on the H.324 communication protocol and the measurement equipment required for additional communication services, and in particular, a 3G multimedia service network using 3G-H.324M, a 3GPP standard for WCDMA. Providing call generation for network monitoring mode and terminal mode that can perform interoperability test, fault tracking, and call traffic monitoring through protocol analysis and network analysis Provides 3G-324M protocol and network analysis device.

According to the present invention, in H.324 requiring call tracking as well as analysis of in-band signals by H.245, it is possible to know who is calling and who is calling by analyzing out-of-band signals by SS7. In response to the needs of consumers who want to analyze the equipment and network corresponding to the above, ITU-T performs detailed analysis starting with TDM Raw Binary Data, and demultiplexing and adaptation layer CRC check of H.223. It implements algorithm based on protocol standard and provides 3G-H.324M protocol and network analysis device that can analyze H.223 Open flag and H.223 Header.

Network Analyzer, H.324, H.324M, 3G-H.324M, H.223, H245, SS7

Description

APAPATUS FOR ANALYZING 3G-H.324M PROTOCOL AND NETWORK}

1 is a structural diagram of an H.324 protocol applied to the present invention;

2 is a network diagram illustrating a 3G-H.324M protocol and a network analyzing apparatus according to the present invention;

3 is a diagram illustrating a network configuration of a network monitoring mode and a terminal mode of a 3G-H.324M protocol and a network analyzer according to the present invention;

Figure 4a is a view showing the configuration modules of the 3G-H.324M protocol and network analysis apparatus according to the present invention,

4b is a software configuration diagram for bearer channel processing of a 3G-H.324M protocol and a network analyzer according to the present invention;

Figure 4c is a software configuration for tapping the SS7 signal of the 3G-H.324M protocol and network analysis apparatus according to the present invention,

Figure 5a is a configuration diagram of the tdmTrace API of Figure 4a,

5B is a diagram illustrating a process of recording a bit stream by the RC API of the tdmTrace API of FIG. 5A;

FIG. 6 is a diagram illustrating H.324 performing an interface between tdmTrace and OMF in a 3G-H.324M protocol and a network analyzer according to the present invention; FIG.

FIG. 7A illustrates in detail the H.223 API of the H.324 API of FIG. 6; FIG.

FIG. 7B illustrates an analysis process of a demultiplexed H.324 stream performed by the H.223 Analysis API of FIG. 7A. FIG.

8 is a view showing in detail the H.245 API of the H.324 API of FIG.

FIG. 9A illustrates an AV API of the H.324 API of FIG. 6 in detail; FIG.

9B is a diagram illustrating a media multiplexing process of the AV API of FIG. 9A;

9c illustrates a storage format of the AV API of FIG. 9a;

FIG. 10 is a diagram illustrating a definition of how to receive information about a media through H.245 API in the 3G-H.324M protocol and the network analyzer according to the present invention;

11 is a diagram illustrating a definition of how to record media in a 3G-H.324M protocol and a network analyzer according to the present invention;

12 is a view for explaining the SS7 ISUP message monitoring provided by the 3G-H.324M protocol and network analysis apparatus according to the present invention,

FIG. 13 is a diagram showing the structure of an H.324 gateway of a 3G-H.324M protocol and a network analyzer according to the present invention; FIG.

14A to 14G illustrate PDU formats of AL1, AL2, and AL3 of the H.223 API of FIG. 7A;

15A to 15F illustrate each frame format of the H.223 Analysis API of FIG. 7A.

The present invention relates to a third generation (3G) communication service infrastructure based on the H.324 communication protocol and the measurement equipment required for additional communication services, and in particular, a 3G multimedia service network using 3G-H.324M, a 3GPP standard for WCDMA. Providing call generation for network monitoring mode and terminal mode that can perform interoperability test, fault tracking, and call traffic monitoring through protocol analysis and network analysis 3G-H.324M protocol and network analyzer.

As 3G (3rd Generation) communication technology and facilities have become a global standard, the demand for related measuring equipment is rapidly increasing. Mobile telecommunications operators including key telecommunications operators are expanding facility investments in network construction and infrastructure construction to implement 3G services. There is a constant demand for instrumentation throughout. Moreover, global demand will arise when considering the future expansion and improvement of telecommunication networks of Europe, the US and Southeast Asia.

In addition, terminals, value-added equipment and cores can be implemented to smoothly implement 3G communication services, multimedia services such as DMB (Digital Multimedia Broadcasting), WiBro (Wireless Broadband Internet), and HSDPA (High Speed Downlink Packet Access). There is an urgent need to develop measurement equipment for service interworking with the core network.

At present, the characteristics of the world-wide measuring equipment are evolving from analog to digital, from single module measuring instruments to multi-function multi-module measuring instruments, and to measuring equipment where quality measurement is important in mechanical measurement. Analyzes and measures 3G-H.324M, 3rd Generation Project Group (3GPP) standard for CDMA services, and performs compatibility tests, troubleshooting, and call traffic monitoring between devices. There is a need for an integrated and objective instrument that can identify the causes and other problems of various errors.

As is known, 3G-H.324M is the Recommendation of the International Telecommunications Union-Telecommunication standardization sector (ITU-T) on voice, moving picture and data communication terminals in a public telephone network. The revision also considered communications over mobile radio networks. Desktop conference software for a PC is employed, and modem control (V.34), multiple data separation method (H.223), and system control (H.245) are essential. H.223 also provides channels for sharing data exchanges, such as file transfers and white boards. The video coding methods are H.261 and H.263, and the voice coding methods are G.711, G.723.1, and G.782.

3G-H.324M is a Recommendation of 3GPP that defines the adaptation of H.324M, an extension for operation in H.324 mobile networks, the ITU-T protocol standard for multimedia communications in General Switched Telephony Networks (GSTNs). to be.

Devices and systems employing protocols based on or derived from H.324, H.324M, and 3G-H.324M are referred to as H.324-type equipment. H.324-type equipment may be connected to other H.324-type equipment via an exchange, and may be connected to non-H.324-type equipment through a multimedia gateway.

As an example of equipment that is not H.324 type, H.323 is an ITU-T protocol standard for multimedia communication in packet networks with non-guaranteed bandwidth. An H.323-type device employs a protocol based on or derived from the H.323 protocol.

In keeping with its universality, the term "H.324" will be used as referring to H.324-type equipment, including H.324M and 3G-H.324M. In addition, while maintaining universality, the term "equipment" is used as referring to either user-side equipment such as a handset or network-side equipment such as a switch or gateway.

When a call occurs between H.324 type devices, the first step of the call establishes an end-to-end bearer between the devices. This step is called call signaling and is outside the scope of H.324 except when modems and GSTNs are used. The second phase of the call provides a means of establishing an H.324 session and transmitting voice, video, and data between devices in a format understood by and supported by the device. To this end, H.324 uses two further ITU-T Recommendations.

The first of the recommendations used is H.223 (Multiplexing Protocol for Low Bit Rate Multimedia Communication). H.223 specifies a frame-oriented multiplexing protocol that allows any combination of digital voice, video and data (command and control) to be transmitted over a single communication link.

H.223 has a number of modes of operation specified in Annex A, B, and C of the H.223 Recommendations for increasing resilience in the event of an error. These are also known as Mobile Levels 1, 2, and 3. H.223, to which none of these appendixes apply, may also be considered to operate at base level.

H.324 has the concept of Logical Channels, a way of providing virtual channels over circuit-switched links. Therefore, the role of H.223 is to combine the data stream portions written in the logical channel into frames known as MUX-PDUs (Multiplexer Protocol Data Units).

Logical channel 0 is always available and is used for commands and controls. Data (voice, video, command and control, and other general data) is passed to / from the H.223 multiplexer through a bit stream called a Service Data Unit (SDU). Before being multiplexed, different SDUs pass through an adaptation layer where additional information can be added for purposes such as error detection, sequence numbering, and retransmission request.

1 shows the structure of H.324. Looking at the structure of H.324 with reference to Figure 1, H.223 including a physical layer (11), a multiplex layer (12), an adaptation layer (13), Application Layer (14), H.245 Control (15), Link Access Procedure for Modem (LAPM) (16), Data Protocol (17), Audio An audio coder 18, an audio I / O 19, a video coder 20, and a video I / O 21 are included.

Here, the physical layer 11 is a layer located on the first layer of the seven layers of the OSI communication protocol. The physical layer 11 handles electrical and mechanical interfaces with respect to the communication medium, and transmits data including a process for connection communication and disconnection. To a signal that is compatible with the The multiplexing layer 12 is responsible for the multiplexing of logical channels generated by the H.245 control 15, and the adaptation layer 13 is responsible for error detection, sequence numbering, and retransmission through the CRC.

The application layer 14 corresponds to an H.223 based video telephone system application, the H.245 control 15 performs system control, and the LAPM 16 modifies an access procedure (LAPD) with a D channel connection. It is responsible for error correction protocols based on high data link control procedures (HDLC). The data protocol 17 is responsible for data processing with the application layer 14. The audio encoder 18 is responsible for encoding audio data and is interfaced with the audio input / output 19, and the video encoder 20 is responsible for encoding video data and is interfaced with the video input / output 21.

The second of these recommendations is the syntax and semantics of equipment information messages as well as the procedure of using the equipment's information messages for in-band negotiation when initiating or during communication. It is H.245 (Control protocol for multimedia communication) that specifies. These messages include transmit and receive capabilities and preferences, logical channel signals and controls, and indications. Messages specified in H.245 are indicated in the ITU-A Abstract Syntax Notation (ASN.1) and may be classified as Request, Response, Command, or Indication type. Can be.

H.245 messages are decrypted according to the ASN.1 standard before being sent. When the device sends a H.245 message of the request type, the message requests the remote device to send an appropriate message of the response type. If an Acknowledgment (Ack) is not received within a certain time, the sending terminal will resend the request, and if no response is received for the repeated request, take other appropriate action. Retransmission of requests can occur many times. Many H.245 messages associated with call setup are of request type.

Accordingly, in order to be compatible with H.245 terminals for in-band call control, measurement equipment capable of analyzing all parameters is required because decoding can be performed according to the stream format of the ASN.1 standard.

H.245 also requires a reliable link for proper operation. The basic means specified in Annex A of H.324 to provide this is that an SRP command frame (SRP) is sent before one or more H.245 messages, known as Multimedia System Control-PDUs (MSC-PDUs) or H.245 PDUs, are transmitted. It uses the Simple Retransmission Protocol (SRP) or Numbered Simple Retransmission Protocol (NSRP), which is formed of Command Frames, and the receiving device uses an SRP Response Frame (SRP Ack, sometimes SRP Ack) that informs the correct reception of an SRP command frame. No further H.245 is sent by the device until the SRP acknowledgment for the last message is received.

When a call is made from an H.324 type equipment, the time at which call signaling is initiated to establish an H.324 call and between the H.324 type equipment and any other equipment other than H.324 or H.324 type. The interval between the times when the exchange of audio and video is started increases.

Therefore, ITU-T's Fast Call Setup was developed to solve the problem of 18 ~ 25 seconds of call connection because the in-band signaling procedure must receive NSRP receive sequence number corresponding to NSRP command sequence number. There is a demand for measuring equipment that can improve compatibility by analyzing errors and retransmissions by standardized methods such as standards.

As described above, in H.324 requiring call tracking as well as analysis of in-band signals by H.245, the out-of-band signal by SS7 can be analyzed to know who is calling and who is calling. In order to meet the demands of consumers who want to analyze the equipment and network corresponding thereto, detailed analysis is required, starting with the analysis of TDM raw binary data, and the CRC check of the demultiplexing and adaptation layer of H.223 is performed. The implementation of algorithms based on the ITU-T protocol standard for H.223 Open flag and H.223 Header analysis is required.

Accordingly, an object of the present invention to solve the above problems is to provide a 3G-H.324M protocol and network analysis device that can easily perform the failure tracking in the core network and service network using H.324-type equipment. .

In addition, another object of the present invention is to provide a 3G-H.324M protocol and network analysis apparatus that can record the status of the network in real time by storing the data stream applied from the H.324-type equipment in the storage.

In addition, another object of the present invention is to provide a 3G-H.324M protocol and network analysis device that does not affect the service of the existing equipment while performing real-time monitoring of H.324-type equipment.

Another object of the present invention is to provide a 3G-H.324M protocol and a network analyzer capable of demultiplexing bit streams of H.324 type equipment.

In order to achieve the above object, the present invention provides an H.324 communication protocol-based 3G-H.324M protocol and a network analyzer, wherein the network is configured to capture a time division multiplexing (TDM) bit stream input from a connected network line. An SS7 interface unit for analyzing the ISUP message of the line, a record control interface unit for receiving the analyzed information from the SS7 interface unit, and recording a low bit stream of the time division multiplexing channel of the network line, from the record control interface unit The H.324M interface unit receives a low bit stream, analyzes log data, captures the packet into packets, receives the packet captured from the H.324M interface unit, and transmits the received packet to the demultiplexer, and sends a response message to the demultiplexer. Receive and transmit to the H.324M interface unit A raw data tracking unit including a face unit and a recording interface unit receiving log data of the low bit stream from the H.324M interface unit and storing the log data of the low bit stream; A demultiplexer for demultiplexing the bit stream captured from the raw data tracker; A reading interface unit for receiving a bit stream applied from the demultiplexing unit to analyze a call control frame applied from the demultiplexing unit, and analyzing the received bit stream in the form of an H.245 message to analyze the analyzed media information. A control message analysis unit configured to include an analysis interface unit applied to the data conversion unit, and a storage interface unit receiving H.245 information from the analysis interface unit and storing the H.245 information in a log file format; A data converter converting the media frame applied from the demultiplexer into a predetermined file format according to the media information applied from the control message analyzer; And a data storage unit for storing a file applied by the data conversion unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they are displayed on different drawings. Detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

3G-H.324M protocol and network analysis device according to the present invention is a H.324 protocol analyzer, a function to monitor the E1 network (Network monitoring) and call generation for the terminal mode (Terminal mode) (Call Generator) ) Are largely divided into functions.

2 is a network configuration diagram of a 3G-H.324M protocol and a network analyzer according to the present invention, and FIG. 3 is a network monitoring mode and a terminal mode of the 3G-H.324M protocol and a network analyzer according to the present invention. Applied network diagram. As shown, the 3G-H.324M protocol and the network analysis device 100 according to the present invention are SS7 (Signal System 7) and bearer channel between the 2G / 3G network 30 and the gateway 40 according to various protocols. To analyze (Bearer Channels, H.324 circuit), make a call in terminal mode (100 ·) and monitor it in network monitoring mode (100 ·).

3G-H.324M protocol and network analysis device 100 according to the present invention and between the W-MSC (WCDMA Mobile Switching Center, not shown) and the gateway 40, H.324 / H.323 / SIP / RTSP A tapper is provided to monitor between the W-MSC and the W-MSC.

Hereinafter, configuration modules for performing the network monitoring mode of the 3G-H.324M protocol and the network analysis apparatus and its operation will be described in detail with reference to FIGS. 4A to 9.

Each of the constituent modules of the 3G-H.324M protocol and the network analysis device according to the present invention receives data from the front end, performs a predetermined task, processes the data, and applies the data to the rear end. In the following description, modules, processors, and APIs refer to components of the 3G-H.324M protocol and a network analyzer.

FIG. 4A is a diagram illustrating configuration modules of a 3G-H.324M protocol and a network analyzer according to the present invention, and FIG. 4B is a software for bearer channel processing of the 3G-H.324M protocol and a network analyzer according to the present invention. Figure 4c is a software configuration for tapping the SS7 signal of the 3G-H.324M protocol and network analysis apparatus according to the present invention, 3G-H.324M protocol and network analysis according to the present invention as shown Device 100 consists of tdmTrace 200, H.324 300 and storage 340.

The tdmTrace 200 captures a time division multiplexing bit stream of an E1 trunk. 4B and 4C, the 3G-H.324M protocol and network analyzer 100 according to the present invention uses an E1 trunking board to monitor the H.324 bearer channel. The E1 trunking board is a CG board 101, which uses a product of NMS Corporation. In addition, the 3G-H.324M protocol and network analysis device 100 is equipped with a CG board 101 for receiving the TDM raw data and a TX4000C board 111 for processing the SS7 signal.

NMS's Natural Access (103, 2005-1 sp1) is installed on the OS (102, Operating System) using Solaris9 to work with the board. At this time, the DSP file uploaded to the DSP of the E1 board is data coming from the E1 trunk and must be bypassed without filtering by the driver 103. Thus, the data bypassed in tdmTrace 200 is delivered via a pipe to the H.324 API 300.

The H.324 API 300 consists of the H.223 API 310, the H.245 API 320, and the AV < RTI ID = 0.0 > (AV < / RTI >) API 330, where the tdmTrace 200 bypasses the E1 trunk 101. Receives the TDM Raw Binary packets and applies them to the H.223 API 310, and the H.223 API 310 receives the H.245 API 320 and voice data used for call control. It applies to the AV API 330 used for audio data and video data. The final result is displayed in the Internet explorer via WOMF 105.

FIG. 5A is a schematic diagram of the tdmTrace API of FIG. 4A. As shown in FIG. 5A, the tdmTrace 200 is divided into four groups including the RC API 221, the LC API 222, the H.324M API 223, and the PC API 231. It consists of an API.

To describe each of the above API in detail, the Record Controlling (RC) API 221 uses the API service of NMS's Natural Access 104. This records the raw bit stream of the defined TDM channel. SS7T 210 analyzes the corresponding ISUP (ISDN User Party) message. At this time, the packet length of the ISUP message should be 5 or more. The SS7T 210 analyzes the packet and obtains IAM (Identity and Access Management) information. You also get a calling party and a called party number. The RC API 221 starts recording by the SS7T 210 finding and signaling a line mapped with the information.

At this time, if the RC API 221 receives ISUP / REL continuously from the SS7T 210, the call is disconnected and the recording of the corresponding line should be stopped. Meanwhile, since H.223 API 310 supports stuffing mode for unnecessary information processing, the RC API 221 needs to capture a bit stream in a range of 00 00 00 E1 4D to 00 00 E1 4D. 5B illustrates a process in which the RC API records a bit stream.

FIG. 6 is a diagram illustrating H.324 performing an interface between tdmTrace and Open Media Frame (OMF) in the 3G-H.324M protocol and the network analyzer 100 according to the present invention, and FIG. A detailed illustration of the H.223 API of the 324 API.

H.223 API 310 reads H.223 Reading APIs 311 that read data from tdmTrace 200 through the pipeline, and the H.324 stream with the H.223 (multiplex layer), as shown in FIG. 7A. Adaptive Layer), H.223 Demux API 312 demultiplexes into SRP, LAPM, CCSRL, and H.245 streams, and the H.223 Analysis API (313) to analyze H.223 data, levels, and multiplexing layers and adaptation layers. H.223 Verify API 314 to check CRC for correct H.223 headers and H.223 Write API 315 to collect H.223 data for storage of log files into storage 510 It consists of. At this time, the H.223 Analysis API 313 further performs a function of analyzing AL1, AL2, and AL3 of the adaptation layer.

In order to facilitate understanding of the 3G-H.324M protocol and the network analysis apparatus 100 according to the present invention illustrated in FIG. 6, the PDUs of AL1, AL2, and AL3 of the H.223 API 310 are illustrated in FIGS. 14A to 14G. Protocol data unit) format is shown. Referring to FIG. 1 again, the H.223 protocol is composed of a multiplex (MUX) layer 12 and an adaptation layer 13, AL. The H.223 protocol is used for exchanging a lot of stream information between upper layers (higher-layers; control / audio / video). The MUX layer 12 uses an AL (which uses a service of a lower physical layer 11). It is responsible for conveying the information stream from 13 to the end.

The information transfer unit between the AL 13 and the upper layer is an AL-SDU. This is shown in Figure 14a. As shown in FIG. 14A, the AL 13 adds additional octets for purposes such as error detection, sequence numbering, and retransmission. It passes to the MUX layer 12. As shown, the Sequence Number (SN) field is an optional 8-bit SN, which provides capacity for a series of AL-PDUs. The AL-PDU Payload field of the AL-PDU format contains a complete AL-SDU whose first octet matches the first octet of the AL. The CRC field is an 8-bit CRC, which provides an error detection capacity over the entire AL-PDU.

The adaptation layer has three types, AL1, AL2, and AL3, depending on the type of transmission information. AL1 is mainly used for the transmission of data or control information. Since AL1 does not provide error detection or correction capacity, the necessary error control, including retransmission procedures, must be provided by higher layers. AL2 is primarily designed for the transmission of digital audio. AL2 provides an 8-bit CRC for error correction.

Accordingly, the 3G-H.324M protocol and network analyzer 100 according to the present invention includes a CRC check routine for checking errors in voice data.

AL3 is primarily designed for the transmission of digital video. AL3 contains a 16-bit CRC for error detection. 14B is a diagram showing the format of AL3. The control field constitutes a Payford Type (PT) field, which indicates a function of the AL-PDU payload. A sequence number (SN) field is shown in FIG. 14C. The CRC field of FIG. 14B is a 16-bit CRC that provides error correction capacity across the entire AL-SDU. Polynomial generator g (x) = x16 + x12 + x5 + 1 to create a CRC pattern.

As described above, the 3G-H.324M protocol and the network analysis device 100 according to the present invention perform a 16-bit CRC check for error checking of image data.

이다.Meanwhile, H.223 Annex B is an H.223 protocol for mobile communication and is a level 2 protocol of the mobile H.223 extension. FIG. 14D illustrates a MUX-PDU format, and FIG. 14E illustrates a header field of the MUX-PDU format. As shown in FIG. 14E, the MC4 bit and the MPL8 bit are MSBs (Most Significant Bits) of the MC and MPL fields, and the P bit is a parity bit field. The MC (Multiplex Code) field is a 4-bit field and indicates where each octet in the information field belongs. The control information is 0, the audio information is 1, and the video information is 2. The MPL (Muliplex Payload Length) field is an 8-bit field, indicating the length of the information field, and the P (Parity bits) field is a field for H.223 header CRC check. Polynomial generator for this

to be.

As described above, the 3G-324M protocol and the network analyzer according to the present invention may analyze the H.223 header and check the parity bit according to the CRC pattern generation algorithm. It also takes the MC field and passes the stream to the H.245 function to create branch and voice and spiritual data.

14F and 14G illustrate an Optional MUX-PDU format and its header field. As shown, H.223 Annex B may have an Optional Header field, which is composed of Annex B's three octet header + one octet header (H.223 Base line header). Accordingly, the 3G-H.324M protocol and network analyzer 100 according to the present invention may analyze the H.223 Optional header.

FIG. 7B shows an analysis process of the demultiplexed H.324 stream performed by the H.223 Analysis API 313 of FIG. 7A. As shown, if the stream from tdmTrace 200 is a control channel, it is sent to H.245 API 320. Other streams are sent to the AV (Audio & Video) API 330. After analysis, the stream sends information to storage 510 for storage as an H.223 log file via the H.223 Verify API 314 and H.223 Write API 315, or an H.223 buffer (not shown). Keep on). Table 1 summarizes the primitives and remarks for the analysis of the demultiplexed H.324 stream performed by the H.223 Analysis API 313 of FIG. 7B.

Primitive Remark H223Stream Demux Separate the H223 stream by the H223 flag, the H223 flag consists of “0x7E”, “0xE1 0x4D” and header. Headers are applied differently depending on the h223 version (Annex A, B, C). SrpStreamDemux The SRP and NSRP streams are separated by a header octet with "0xF9" and a sequnce number 1 octets, and the NRSP has a CCSRL field 1 octet. SrpRspStreamDemux SRP response streams are separated by header octets such as "0xFB". NSRP response stream headers are separated by "0xF7". Lapmstreamdemux Separate the LAPM stream by the Address field "0x3F".

In addition, each frame format of the H.223 Analysis API 313 of FIG. 7A is illustrated in FIGS. 15A to 15F. FIG. 15A is a diagram illustrating the format of an SRP command frame, and FIG. 15B is a diagram illustrating the SRP command frame format in NSRP mode, in which an information field of the SRP command frame shown in FIG. 15A is to be replaced by a CCSRL frame in NSRP mode. It is shown.

The header octet of the SRP instruction frame has binary 1111 1001 (249, oxF9). The FCS field contains a 16-bit CRC.

FIG. 15C illustrates a format of an SRP response frame. Each SRP response frame includes a header 1111 1011 (251, oxFB) in SRP mode and 1111 0111 (247, oxF7) in NSRP mode.

FIG. 15D illustrates the format of the CCSRL-PDU, and is composed of an 8-bit LS field indicating the last segment of the CCSRL-SDU, and is set to binary 1111 1111.

FIG. 15E shows the head format, where the H.223 level is composed of Level 0 (Base line), Level 1 (Annex A), Level 2 (Annex B), and Level 3 (Annex C). The flag bit pattern of the level 0 (H.223 Base line) is 0111 1110 (ox7E), and the flag bit pattern of the level 1 (H.223 Annex A) is 16-bit with 1110 0001 and 0100 1101 (0xE1 0x4D). Has a double flag, and level 2 (H.223 Annex B) has a header format of 3 octets. FIG. 15F is an optional header format, in which a stuffing mode is used if information is invalid. The MPL field value is 00000000 and the MC field value is 0000.

FIG. 8 illustrates the H.245 API of the H.324 API of FIG. 6 in detail, in which the H.245 API 320 is analyzed by the ANS.1 API 325 in various message forms. At this time, the ANS.1 API 325 uses a 3rd party compiler.

The H.245 API 320 may include a Master Slave Determiantion Message, Terminal Capability Message, Logical Channel Signaling Message, Multiplex Table Signaling Message, Request MultiplesTable Signaling Message, Request Mode Message, Round Trip Delay Message, and Maintenance Loop Message. .

The H.223 API 310 analyzes the header of each stream and causes the H.245 API 320 to process it for call control. The H.245 API 320 is divided into three groups: Reading (321), Analysis (322), and Recording (323) APIs. That is, the H.245 API 320 receives Hexadecimal data from the H.223 Analysis API 313 (Reading), analyzes the stream in the form of an H.245 message (Analysis), and in the form of a log file. .245 Recording Information.

FIG. 9A illustrates the AV API of the H.324 API of FIG. 6 in detail, where the AV API 330 obtains information about the media stream from the H.245 API 320. And it receives and stores the AL-SDU from H.223 (310). As shown, the Analyze API 331 of the AV API 330 receives information from the H.245 API 320 about the AL-PDU type, media type, and how many octets are used for the control field. Pass to the API (332). Accordingly, the Record API 332 sends media information to the AV API 330 and receives a media (Audio and / or Video) stream from the H.223 310. In addition, the AV API 330 presents a method for what storage type (* .3gp) to store the media stream.

FIG. 9B is a diagram illustrating a media multiplexing process of the AV API of FIG. 9A, and FIG. 9C is a diagram of a storage format of the AV API of FIG. 9A, and as shown, H in the H.324 API 300. The .223 API 310 reads the incoming header and causes the AV API 330 to process streams that are audio and video data. Accordingly, the AV API 330 merges the audio and video data into a 3gp file according to the storage format of FIG. 9c and stores it as a file having a 3gp extension.

FIG. 10 is a diagram illustrating a definition of how to receive information about a media through the H.245 API 320 in the 3G-H.324M protocol and the network analyzer according to the present invention.

As shown, H.223Capability can accommodate audio data and video data respectively or together for the transmission media. VideoCapability determines which video codec is used (MPEG-4, H.263), AudioCapability determines which audio codec is used (AMR, G.723.1), and LogicalChannelNumber The channel number to which audio data or video data is sent is determined (audio data-LCN1, video data-LCN2). LogicalChannelParameter describes the parameters for the AL-PDU format. That is, the data with sequence number and the data without sequence are described separately for audio data, and the data without control octet, data with one control octet and data with two control octets are separately described.

FIG. 11 is a diagram illustrating a definition of how to record media in the 3G-H.324M protocol and the network analyzer according to the present invention. Since the description is included in the drawing, detailed description thereof will be omitted.

12 is a view for explaining the SS7 ISUP message monitoring provided by the 3G-H.324M protocol and network analysis apparatus according to the present invention, as shown in the 3G-H.324M protocol and network analysis apparatus ( 100) taps out-of-band signals using TxBoard 111 of NMS. The 3G-H.324M protocol and network analyzer 100 according to the present invention analyzes the SS7 MTP3 / ISUP message between the SS7 network element A 60 and the element B 70 through monitoring. The 3G-H.324M protocol and the network analysis apparatus 100 first distinguish MTP3 (Message Transfer Part3) and analyze the packet of the ISUP message of the MTP3 higher according to the packet length.

The 3G-H.324M protocol and network analyzer 100 according to the present invention analyzes the IAM in the ISUP message to find the Mobile Identification Number (MIN). Also get the called party number. IAM is the time to start recording the line. Next, the SAM is analyzed and the final MIN number is obtained by adding the MIN number of the IAM message. The REL and RLC are analyzed to stop packet recording on the line. At this time, the emphasis is placed on the synchronization of the outgoing SS7 signal and the corresponding line of the bearer.

Detailed technical details of MTP3 may be understood by referring to MTP3 ITU-T Q.701-707, and thus detailed descriptions thereof will be omitted. In addition, the technical details of filtering packets in ISUP should be referred to ITUT-T Q.761 ~ 765 and omitted in the detailed description.

Next, the CallGen function performed in the terminal mode of the 3G-H.324M protocol and the network analysis device 100 according to the present invention will be described in detail with reference to FIGS. 3 and 13.

3 is a network diagram illustrating a network monitoring mode and a terminal mode of the 3G-H.324M protocol and the network analysis device according to the present invention, and the CallGen of the 3G-H.324M protocol and the network analysis device 100 according to the present invention. (100 ··) is used to test the performance of a device or measure its efficiency by generating a call through a virtual or real 3G network. CallGen (100) for the terminal mode of FIG. 3 generates an API 121 and a call for H.324 gateway function as shown in FIG. Divided by API 122.

As shown in FIGS. 3 and 13, the H.324 gateway 121 conforms to the standard H.324 protocol for interworking with the W-MSC 31. NMS's TxBoard (111) and stack are used for out-of-band call signal, based on MTP3 / ISUP. At this time, all messages of the ISUP can be encoded and decoded. In consideration of this compatibility, the interface with H.324 TDM uses NMS's VideoAccess API 121. In addition, the 3G-H.324M protocol and network analysis apparatus 100 according to the present invention supports Fast Call setup based on WNSRP defined by ITU-T, and audio and video data RTP (Real-time Transport) for a standardized interface. Protocol to send and receive. Audio supports AMR-NB, G.723.1, and video supports H.263 and MPEG4 codecs.

In addition, the 3G-H.324M protocol and network analysis device 100 according to the present invention has a H.324M Terminal Compatibility Enhancements function, supports audio encoding (Tanscoding), and the interface with CallGen (100) Modular support. CallGen 100... Provides API 122 for generating SS7 ISUP calls. This command causes the gateway to encode the ISUP message and push it down the stack. At this time, the duration can be selected by the operator.

Accordingly, the 3G-H.324M protocol and network analysis device 100 according to the present invention provides an API 122 for creating various scenarios, the scenario can be changed in real time. Accordingly, the response to all calls follows the scenario defined by CallGen (100). In addition, as in the network monitoring mode (100 ·), in the CallGen mode (100 ·), the stored 3gp file is played, and the API (123) for separating and managing the stored 3gp file into audio data and video data is provided. .

As described above, the 3G-H.324M protocol and the network analysis apparatus 100 according to the present invention are largely equipped with a network monitoring function and a callgen (call generator) function, so that the network monitoring is a bearer E1 TDM. As a channel function, it is possible to monitor line on / off in real time while keeping CPU utilization below 50%, complete analysis and recording of three E1s, perform SS7 ISUP monitoring of two links, and CallGen can bear Bearer E1 Up to 120 ports of 4E1 and H.324 are available simultaneously, and four links of SS7 signals are supported.

The 3G-H.324M protocol and the network analysis device according to the present invention provide various functions as described above to cause various errors that may occur in the network to the network management division or research institute of the communication service provider (KT, KTF, SKT). Provides objective network instrumentation for troubleshooting and other problems. In addition, the 3G-H.324M protocol and network analysis device according to the present invention is CallGen and to confirm that the protocol is normally processed in the laboratory of companies participating in various BMT and companies developing H.324 gateway or other applications. Provide a protocol analyzer.

The 3G-H.324M protocol and the network analysis device according to the present invention provide trouble tracking and troubleshooting to a core network (in-band) or service network (out-of-band) using WCDMA, that is, an H.324 line. It can also be used as a recording device by storing streams coming in via H.324 circuitry in storage.

On the other hand, in the detailed description of the present invention has been described with reference to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention can be utilized for fault tracking and troubleshooting in core or service networks using H.324 circuits, and can also be used as recording equipment by storing streams coming through H.324 circuits in storage. There is an advantage to this.

In addition, the present invention, unlike the existing equipment to measure as needed, even if the equipment is continuously installed for real-time monitoring of the line, there is an advantage that it is easy to troubleshoot because the existing service is designed without any problem.

In addition, the present invention has the effect of replacing the foreign equipment as domestic equipment by providing a function to monitor the H.324 line.

In addition, the present invention is secured by the domestic technology that the original technology for demultiplexing the bit stream in the 3G-H.324M protocol can easily cope with the expansion of the terminal and service expansion in accordance with the expansion of the WCDMA network in the future 3G-H It has the effect of advancing the .324M protocol and network analyzer.

Claims (6)

In 3G-H.324M protocol and network analyzer based on H.324 communication protocol, An SS7 interface unit for analyzing an ISUP message of the network line to capture a time division multiplexing (TDM) bit stream input from a connected network line, and a time division multiplexing channel of the network line by receiving information analyzed from the SS7 interface unit A record control interface unit for recording a low bit stream of the H.324M interface unit, an H.324M interface unit for receiving a low bit stream from the record control interface unit, analyzing log data, and capturing the packet into a packet; and capturing from the H.324M interface unit. The received packet and transmit the received packet to the demultiplexer, receive the response message of the demultiplexer, and apply the received data to the H.324M interface, and apply log data of the low bit stream from the H.324M interface. Take the data to the storage A raw data tracking unit including a recording interface unit; A demultiplexer for demultiplexing the bit stream captured from the raw data tracker; A reading interface unit for receiving a bit stream applied from the demultiplexing unit to analyze a call control frame applied from the demultiplexing unit, and analyzing the received bit stream in the form of an H.245 message to analyze the analyzed media information. A control message analysis unit configured to include an analysis interface unit applied to the data conversion unit, and a storage interface unit receiving H.245 information from the analysis interface unit and storing the H.245 information in a log file format; A data converter converting the media frame applied from the demultiplexer into a predetermined file format according to the media information applied from the control message analyzer; And 3G-H.324M protocol and network analysis device, characterized in that it comprises a; data storage unit for storing the file applied by the data conversion unit. delete The method of claim 1, wherein the demultiplexer, A reading interface unit for reading data from the row data tracking unit; A demultiplexing interface unit for demultiplexing the bit stream applied from the reading interface unit into an H.223 message form; An analysis interface unit analyzing the bit stream applied from the demultiplexing interface unit and applying the control stream to the control message analyzing unit if the control channel is applied, and applying the data to the data conversion unit if not the control channel; A verification interface unit receiving error bit stream analysis results from the analysis interface and performing error checking; 3G-H.324M protocol and network analysis device, characterized in that it comprises a recording interface unit for collecting the log files of the bit stream applied from the verification interface unit and stored in the data storage unit. delete The method of claim 1, wherein the data conversion unit, An analysis interface unit for receiving information on the media stream applied from the control message analyzer and a protocol data unit applied from the demultiplexer to analyze media information; 3G-H.324M protocol and network analysis device comprising a storage interface unit for receiving the media information from the analysis interface unit and stores in the data storage. In 3G-H.324M protocol and network analyzer based on H.324 communication protocol, A raw data tracking unit for capturing a time division multiplexing (TDM) bit stream input from a connected network line; A demultiplexer for demultiplexing the bit stream captured from the raw data tracker; A control message analyzer for analyzing a call control frame applied from the demultiplexer; A data converter converting the media frame applied from the demultiplexer into a predetermined file format according to the media information applied from the control message analyzer; And A network monitoring mode configured to include a data storage unit for storing a file applied by the data conversion unit to perform monitoring of an in-band circuit; 3G-H.324M protocol and network analysis device, characterized in that the terminal mode for monitoring the out-of-band line by tapping the SS7 signaling link, creating a call according to the call generation scenario.

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