KR100414367B1 - Apparatus and method for detecting data conversion error in mobile switching system - Google Patents

Abstract

The present invention provides a data transmission device between a mobile communication terminal system and an interworking device (IWF), the HDLC processing unit for converting and outputting the data input and output via the interlocking device in the form of HDLC, the data input and output from the HDLC processing unit and the interworking A frame relay processing unit including a frame relay converting unit for converting and outputting a protocol of data input and output from the apparatus; A switch matching connector for detecting data input / output to the HDLC processing unit and data input / output to the frame relay conversion unit, a central processing unit for performing data error checking of the HDLC processing unit and the frame relay conversion unit detected by the switch matching connection unit, and the central processing unit; An apparatus and method for monitoring data conversion errors in a mobile communication system including a memory unit for storing information to be processed during error checking of a processing unit, and a monitoring unit having an interface unit for performing an interface for data exchange between the central processing unit and an operation terminal. In this way, frame loss and PPP frame CRC errors occurring during interworking can be detected, thereby improving system debugging efficiency.

Description

Apparatus and method for detecting data conversion error in mobile switching system}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transmission of a mobile communication system. In particular, a user traffic data frame exchanged between a mobile switching center and a base station center may be used in a public telephone network. Public Switched Network) In order to improve the function of the Frame Relay Handler Module to be transmitted to the interlocking unit, the operation state of each unit is examined by examining the data frames inputted to the Frame Relay processing unit and the data frames outputted from the frame relay processing unit. The present invention relates to a data conversion error monitoring device and a method of a mobile communication system suitable for verifying.

In general, an exchange of a mobile communication system performs a matching function between respective networks to interwork a mobile terminal connected to a mobile communication network to a public switched telephone network (PSTN) and a public switched data network (PSDN). It has an inter-working function (IWF).

The frame relay processing unit transmits a wireless data frame transmitted and received between the mobile terminal and the base station or the mobile terminal to the interworking device, and transmits the data frame received from the interworking device to the mobile terminal. Perform protocol conversion for the protocol.

In this case, the data frame protocol-transformed by the frame relay processing unit has a PPP frame (Point-to-Point Protocol Frame) that enables TCP / IP connection. It is necessary to check whether an error occurs due to protocol conversion of the PPP frame. have.

Hereinafter, a mobile communication system according to the prior art will be described.

First, Fig. 1 is a block diagram of a frame relay processing block of a conventional mobile communication system.

As shown in Fig. 1, the conventional mobile communication system includes: a base station 10 for relaying a signal of a mobile communication exchange period with a mobile terminal; Converts the protocol of the radio data frame exchanged with the base station 10 and outputs the protocol to the interlocking unit 30, converts the protocol of the subscriber data input from the interlocking unit 30 and outputs the protocol to the base station 10 A relay processor 21; The frame relay processing unit 21 receives data and performs a matching between the communication networks, and comprises an interworking unit 30 for interworking the mobile communication network and the public telephone network.

Referring to the operation of the device according to such a configuration as follows.

When the wireless data is transmitted from the mobile terminal, the base station 10 relays the wireless data and transmits the wireless data to the mobile switching center (MSC) 20.

The wireless data transmitted to the mobile communication switch 20 is input to the frame relay processing unit 21 through a switch matching connection unit (Sub High Way, SHW).

When wireless data is input, the frame relay processing unit 21 drives the wireless data in the form of a High Level Data Link Control (HDLC) frame to perform protocol conversion so that the data can be transmitted to a public telephone network. The interface between the mobile communication switch 20 and the linkage unit 30 is transmitted to the linkage unit 30 through the interface.

The subscriber data transmitted from the public telephone network to the mobile communication network is input to the interlocking unit 30 and transmitted to the frame relay processing unit 21 through the L interface.

The data transmitted from the interworking unit 30 is converted into wireless data for mobile communication network transmission in the frame relay processing unit 21 and transmitted to the mobile terminal through the base station 10, thereby matching the public telephone network with the mobile communication network.

As described above, in the system according to the related art, the frame relay processor drives a wireless data frame received from the mobile terminal in the form of an HDLC frame, performs protocol conversion, and transmits the protocol to the interlocking unit. By performing the transmission to the mobile terminal it is possible to match between the mobile communication network and the public telephone network.

However, in the above-described prior art system, the frame relay processing unit transmits radio data input from the base station to the interlocking unit and transmits subscriber data input from the interlocking unit to the base station. Therefore, since there is no method for detecting an error of a transmitted data frame, there is a disadvantage in that the reliability of protocol conversion cannot be confirmed.

In addition, since the operation state of each unit in the frame relay processing unit cannot be checked, debugging of the unit board is not easy.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to improve a function of a frame relay processing unit for transmitting a radio data frame exchanged between a mobile communication switch and a base station to a public telephone network interworking device. To provide a data conversion error monitoring apparatus and method of the mobile communication system to check the data frame input and output to the frame relay processing unit to check the operation state of each unit.

In order to achieve the above object, the present invention provides a data transmission device between a mobile communication terminal system and an interlocking device (IWF), the HDLC processing unit for converting and outputting the data input and output via the interlocking device in the HDLC form, and A frame relay processing unit including a frame relay conversion unit for converting and outputting a protocol of data input and output from the HDLC processing unit and data input and output from the companion device; A switch matching connector, a central processing unit performing data error checking of the HDLC processing unit and the frame relay conversion unit detected by the switch matching connecting unit, a memory unit storing information processed during error checking of the central processing unit, the central processing unit and For data exchange between operating terminals Provided is a data conversion error monitoring apparatus of a mobile communication system including a monitoring unit having an interface unit for performing an interface. Another aspect of the present invention provides a central processing unit of a monitoring apparatus by receiving heterogeneous manganese data transmitted and received between a base station and a companion device. Performing error checking of the received heterogeneous manganese data and deleting the data having an error; storing the frame of data in a memory unit of the monitoring apparatus when the frame error checking of the data is normal; It provides a data conversion error monitoring method of the mobile communication system comprising the step of accumulating the error count when the error is confirmed by performing an error check on the frame of the data stored in the memory unit in the above step.

1 is a block diagram of a frame relay processing block of a mobile communication system according to the prior art;

2 is a block diagram of a data conversion error monitoring apparatus of a mobile communication system according to an embodiment of the present invention;

3 is a detailed block diagram of a mobile communication switch in FIG.

Figure 4 is a detailed block diagram of the monitoring unit in Figure 3,

5 is a flowchart illustrating a data conversion error monitoring method of a mobile communication system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

50: base station 60: mobile communication switch

61 frame relay processing unit 62 monitoring unit

70: linkage

Hereinafter, the configuration and operation of the data conversion error monitoring apparatus and method of the present invention as described above will be described in detail according to an embodiment.

First, Figure 2 is a block diagram of a data conversion error monitoring apparatus of a mobile communication system according to an embodiment of the present invention, Figure 3 is a detailed block diagram of the mobile communication switch in Figure 2, Figure 4 is monitored in Figure 3 5 is a flowchart illustrating a data conversion error monitoring method of a mobile communication system according to an embodiment of the present invention.

As shown in Fig. 2, the data conversion error monitoring apparatus of the mobile communication system according to the present invention includes a frame relay processing unit 61 for exchanging data with the base station 50 and the interworking unit 70 by protocol conversion; And a monitoring unit 62 for checking an error of a data frame input and output to the frame relay processing unit 61.

As shown in FIG. 3, the frame relay processing unit 61 drives the input data in the HDLC form and outputs the data driven in the HDLC form to the frame relay converter 82 and the monitoring unit 62. An HDLC processor 81; Frame relay converter 82 converts the protocol of the data input from the HDLC processing unit 81 and the data input from the interlocking unit 70 and outputs the protocol-converted data to the monitoring unit 62. do.

As shown in FIG. 4, the monitoring unit 62 includes: a switch matching connector 91 for matching input data between the switch matching connection channel and the central processing unit 92; A central processing unit (92) for performing an error check on data input from the switch matching connector (91); A memory unit 93 for storing information used for error checking in the central processing unit 92; An interface unit 94 for performing an interface for data exchange between the central processing unit 92 and the operation terminal 95; It consists of an operating terminal 95 for controlling the inspection function of the central processing unit 92 and receiving the inspection result.

Referring to the operation of the device according to such a configuration as follows.

When the mobile terminal transmits wireless data, the base station 50 relays the wireless data and transmits the wireless data to the mobile communication switch 60.

The frame relay processor 61 of the mobile communication switch 60 performs protocol conversion to match the wireless data transmitted from the base station 50 with the public telephone network and outputs the protocol data to the interworking unit 70.

When the frame relay processor 61 performs the protocol conversion on the wireless data, the monitoring unit 62 checks the converted data frame to confirm the reliability of the protocol conversion.

That is, as shown in FIG. 3, the wireless data frame transmitted from the base station 50 is input to the HDLC processor 81 through the switch matching channel, and the monitoring unit 62 detects the wireless data frame.

The wireless data frame input to the HDLC processing unit 81 is driven in HDLC form and output to the frame relay converting unit 82 through an internal bus, and the frame relay converting unit 82 performs protocol conversion for the data frame. By outputting to the interlocking unit 70 through the switch matching connection channel.

At this time, the monitoring unit 62 detects the data output from the frame relay converter 82 to the interlocking unit 70.

The monitoring unit 62 detects an error in the data frame by detecting an error in the data frame by detecting the data frame inputted to the HDLC processing unit 81 and the data frame output by protocol conversion in the frame relay changing unit 82, respectively. Will be checked.

The operation of performing the error check in the monitoring unit 83 may include a first path in which data passes sequentially through the base station 50, the mobile communication switch 60, and the public telephone network interworking unit 70, or the reverse order of the first path. In accordance with the second path through the public telephone network interworking unit 70, the mobile communication switch 60 and the base station 50, respectively.

That is, the monitoring unit 83 converts the data frame input from the base station 50 of the first path to the HDLC processing unit 81 through the switch matching connection channel, and the protocol conversion of the data in the frame relay conversion unit 82. After this is performed, error checking is performed by detecting each data frame output to the interlocking unit 70.

In this case, the monitoring unit 83 outputs data input as shown in FIG. 4 to the central processing unit 92 by the switch matching connection unit 91, and the central processing unit 92 standardizes a cyclic redundancy test (CRC test). An error check is performed on the data frame using a check method such as the following.

The error check result performed by the central processing unit 93 is output to the operation terminal 95 through the interface unit 94 made of an interface device such as RS-232C.

The operator of the mobile communication switch 60 is recognized through the operation terminal 95, and the inspection operation of the central processing unit 92 can be controlled by the operation terminal 95.

As such, if there is no error in the inspection result of the received data frame and the transmitted data frame through the frame check of the first path, the reliability of the protocol conversion of the frame relay processor 61 is confirmed.

And error checking of the second path proceeds to the inverse of the first path.

That is, the interlocking unit 70 detects user data input to the frame relay converting unit 82 through the switch matching connection channel, and the HDLC processing unit 81 detects user data output through the switch matching connection channel. The test will be performed.

Thus, if there is no abnormality in the received data frame and the transmitted data frame as in the error checking of the first path, it is determined that the protocol conversion is normally performed.

Therefore, through the error checking as described above, whether or not the normal operation of each unit in the frame processing unit by detecting a phenomenon such as the data frame loss (Frame Loss) and PPP Frame CRC Error (PPP Frame CRC Error) occurring during the protocol conversion process You can check.

Hereinafter, a data conversion error monitoring method of a mobile communication system according to the present invention will be described.

As shown in FIG. 5, in the data conversion error monitoring method of the mobile communication system according to an embodiment of the present invention, the central processing unit performs CRC check on the received HDLC data by receiving HDLC data transmitted from a base station. First steps ST11 to ST14 discarding the HDLC data in which the CRC error has occurred; A second step (ST15) of storing the frame of the data in the memory unit if the frame CRC check of the HDLC data is normal in the steps ST11 to ST14; When the CRC error is confirmed by performing a CRC check on the frame of the data stored in the memory unit in the step ST15, a third step (ST16 to ST17) accumulates the error count.

Referring to the operation of the method according to such a configuration as follows.

In the first steps ST11 to ST14, the central processing unit receives HDLC data of the base station through the switch matching channel (ST11), and performs CRC check on the received HDLC data (ST12).

If the CRC check result is not normal (ST13) in step ST12, and the CRC check result is not normal (ST13), a CRC error has occurred in the HDLC data and is discarded without transmitting the HDLC data frame (ST14).

In the second step ST15, if the CRC check of the HDLC data is normal (ST13), the PPP frame of the data is stored in the memory unit (ST15). In this case, since the PPP frame is received by being split by 20 bytes, the PPP frame is stored from the start frame to the end frame for the CRC check.

In the third step ST16 to ST17, the CRC check on the PPP frame stored in the memory unit is normal in the step ST15 (ST16). When the CRC error of the PPP frame is confirmed in the step ST16, the error count is accumulated (ST17). By checking the trend of the error count, a statistical analysis of the error in data conversion is possible.

In this case, the cyclic redundancy check (CRC) for the data frame is a standardized test method according to the recommendation of the International Telecommunication Union, which can detect errors in data transmission. That is, cyclic redundancy check can search for errors occurring in 1 and 2 bits, errors occurring in odd bits, and consecutive errors of 16 bits or less using 16 bit check codes such as CRC-CCITT.

As described above, the present invention can improve the reliability of protocol conversion of the frame relay processing block by checking whether each data frame of user data transmitted and received from the base station and the public telephone network interworking unit is abnormal. You can check it.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the apparatus for monitoring data conversion error of the mobile communication system according to the present invention and a method thereof include a frame loss occurring when the system interworks a frame relay processing block that performs time division multiplexing (TDM) matching. Frame Loss) and PPP Frame CRC Error can be detected, thereby improving the efficiency of system debugging.

In addition, since the operation state of each unit can be inspected without affecting other units in the system, debugging operations such as sorting, repairing, and replacing malfunctioning units can be performed in an active mobile communication system.

Claims (4)

In the data transmission device between the mobile communication terminal system and the interlocking device (IWF), A frame relay unit including an HDLC processing unit for converting and outputting data input and output through the interlocking device into HDLC form, and a frame relay converting unit converting and outputting a protocol of data inputted and outputted from the HDLC processing unit and data inputted and outputted from the interlocking device; A processing unit; A switch matching connector for detecting data input / output to the HDLC processing unit and data input / output to the frame relay conversion unit, a central processing unit for performing data error checking of the HDLC processing unit and the frame relay conversion unit detected by the switch matching connection unit, and the central processing unit; Device for monitoring the data conversion error of the mobile communication system, characterized in that it comprises a memory unit for storing information to be processed during the error check of the processing unit, an interface unit for performing an interface for data exchange between the central processing unit and the operation terminal . delete delete Receiving heterogeneous manganese data transmitted and received between a base station and a companion device, and performing an error check of the received heterogeneous manganese data by the central processing unit of the monitoring apparatus and deleting data in which the error occurs; Storing the frame of data in a memory unit of the monitoring apparatus when the frame error check of the data is normal in the step; And performing an error check on a frame of data stored in the memory unit in the step, and accumulating an error count when an error is confirmed.