KR100347183B1 - A checking system for finding the data transmission error in wireless communication network - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for analyzing the performance of wireless data in a mobile communication network, and more particularly, to use a wireless data service of a mobile communication network such as accessing the Internet or using e-mail. The present invention relates to a wireless data performance analysis system for a mobile communication network to solve the quality degradation problem. Unlike the conventional wired network, the mobile communication network may have problems of high error rate and quality deterioration due to mobility, and such deterioration factor is very complicated. Therefore, by using a portable protocol analyzer, it is possible to identify factors that substantially reduce performance, and to measure and analyze data traffic between mobiles, thereby enabling data quality and mobile data analysis according to the local location of the mobile communication network. In addition, we propose a measurement method for guaranteeing a high quality data service to a user using a mobile communication network.

Description

Wireless data performance analysis system for mobile communication network {A checking system for finding the data transmission error in wireless communication network}

The present invention relates to a system for analyzing the performance of wireless data in a mobile communication network, in particular, when using a mobile communication network, when accessing the Internet, or using an e-mail, such as when using a wireless data service of the mobile communication network The present invention relates to a wireless data performance analysis system for a mobile communication network to solve the quality degradation problem. Unlike the conventional wired network, the mobile communication network may have problems of high error rate and quality deterioration due to mobility, and such deterioration factors are very complicated. Therefore, there is a need for a mobile communication measurement system that can determine which factors actually cause performance degradation. There are two major mobile communication measurement systems: first, a signal / data monitoring system that monitors how well data is received between a mobile station and a base station, and second, a mobile station is connected to the Internet. There is a data protocol analysis system for a mobile communication network that connects to the Internet for access, determines the time taken to transmit and receive data, and how many errors have occurred in the wireless or wired sections by then. However, the signal / data monitoring system only measures the BER (Bit Error Rate) and power strength of the transmitted / received data flowing in the wireless section, and the time required for the data to be correctly transmitted and received and the response to the data request is returned. And the shape of the transmission / reception data for determining the data error cannot be measured. On the other hand, the data protocol analysis system for mobile communication network confirms and transmits accurate data in order to measure accurate data. That is, in order to measure accurate data, it is necessary to know the sequence of data transmitted and received by the terminal and the server. According to the related art, Korean Patent Application No. 10-1998-0039419 describes a protocol analysis system, which converts data transmitted from a terminal to be performed in an emulation mode or a monitoring mode, and transmits and receives between a terminal device and a network device. By enabling the analysis of the data without using an exchange, the user can easily determine whether or not the data is to be transmitted. However, the above description does not describe performance analysis on connection time, error rate, etc. necessary for measuring accurate data. Another prior art Korean Utility Model Registration No. 20-1998-0016094 describes a wide area network protocol analysis device, which separates and maintains only minimal basic functions for real-time collection and analysis of wide area network protocol data. Can be implemented in a simple form. However, there is a problem that the above technique cannot be used in a mobile communication network. In addition, the system described in US Pat. No. 5,850,388 describes a method for transmitting and receiving data promised to each other to ensure accurate transmission of data in an analyzer or meter, although various performance indicators can be measured. Not. Therefore, there is a problem that cannot accurately measure the error rate, retransmission rate, round trip time, etc. of the frames generated in the wireless and wired interval.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to have a portable structure capable of measuring and analyzing data traffic even while moving, and simultaneously having a traffic generation and analysis function. By providing a protocol analysis system, it is possible to search the causes of performance degradation of wireless data, and to obtain performance indicators such as the time required for connection between the mobile terminal and the server. The purpose of the present invention is to provide a protocol analysis system that enables data analysis to provide a high quality data service. In order to achieve the above object, the present invention provides a wireless mobile communication terminal connected to a wireless network system; Protocol analysis means for intercepting and analyzing wireless data packets which are connected to the mobile communication terminal and transmitted and received over a wireless section; A mobile communication base station communicating with the wireless mobile communication terminal over a wireless section; An IWF (Inter-working Function) which is connected to the mobile communication base station and is a protocol switching device between a wired section and a wireless section; A wireless data performance analysis system for a mobile communication network comprising a data server on the Internet that can process user data sent from the protocol analysis means and send a response to the protocol analysis means through the IWF and the Internet. The means comprises: application program means for producing a transmit / receive packet for the user; Router tracing means for tracing a path along which a transmission / reception packet made by said application program means travels on a network; And analyzing means for hooking the transmission / reception packet for the user and performing analysis according to a corresponding protocol layer. The present invention also provides a protocol analysis method for analyzing the performance of wireless data for a mobile communication network, initializing a system variable to operate an analysis system, and initializing a hooking driver for hooking a transmission / reception packet made by a user program. It connects the driver interface with the protocol analyzer, sets the current analysis conditions such as the IP address and analysis time of the connected server for analysis, and the packet processing thread for analyzing the transmitted / received packets hooked up to the protocol analyzer. In the initializing step of executing, and the user has initialized the protocol analyzer, the step of attempting a dialing connection to automatically connect to the server by pressing a button, the user after the dialing connection to the PPP layer and IP layer Connection time, error, etc. Extracting the protocol connection information, and checking the connection of the IP layer within a certain time, if not connected, it is regarded as a failure to make a database of the time, and if connected, the connection time, error rate, etc. analyzed in the connection process Analyzing the database and the database, the step of making a packet sent and received to the server after the connection through the previous step and attempting an FTP connection, when the FTP is connected and executed, by sending and receiving data having a specific form, etc., Hooking and analyzing the data by a protocol analyzer; analyzing and providing a connection good rate and a good transmit rate to the user while the data is being transmitted and received; and storing the analyzed data in a database for the user to view And the number of times of transmission and reception and the time limit for which the data transmission and reception is a limited threshold. Checking whether the file transfer has been performed, and if the regular data transmission / reception is out of the limited threshold, try FTP connection again, and if the threshold is not out of range, check the error by comparing the stored file of the transmission / reception data with the original, Producing a comprehensive statistic of the rate.

1 is a schematic diagram of a wireless data performance analysis system using a general protocol analyzer,

2 is a diagram showing a protocol structure of a wireless data performance analysis system for a mobile communication network according to the present invention;

3 is a diagram showing the structure of the data analysis software of the wireless data performance analysis system for a mobile communication network of the present invention;

4 is a flowchart illustrating a measurement and analysis sequence in a wireless data performance analysis system for a mobile communication network of the present invention.

Explanation of symbols on the main parts of the drawings

1, 16: Protocol Analyzer 2: Wireless Terminal

3: mobile communication base station 4: protocol switching device

7: Protocol Analyzer Device Module 12: Path Tracking Tracer

13: Analysis Module 14: Hooking Driver

15: Protocol Analysis Stack 17: RS232 Serial Driver

Hereinafter, an embodiment of the protocol analysis system of the present invention described above will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a wireless data performance analysis system using a general protocol analyzer, in which a protocol analyzer 1 is connected to a wireless terminal or a wireless modem 2 capable of wireless data communication through a mobile communication network. Here, the protocol analyzer 1 captures and analyzes wireless data packets transmitted and received in a wireless section through the wireless terminal 2. The wireless terminal 2 is a commonly used DCS or PCS terminal and includes all terminals capable of wireless data communication. The signal from the wireless terminal 2 passes through an interworking function (IWF), which is a protocol switching device between a wired section and a wireless section, through an intermediary device 3 for wireless communication with the terminal in a wireless section, and then the Internet. It is sent to the data server 6 on the Internet via the section. Here, the data server 6 on the Internet is any server on the Internet capable of processing user data sent from the protocol analyzer 1 and sending a response to the analyzer. The protocol analyzer device module 7 is an analyzer composed of a mobile terminal 2 for mobile communication and a PC or an embedded system for analyzing a signal. That is, the protocol analyzer 1 and the wireless terminal 2 are devices in which user data transmission and reception functions and analysis functions are integrated, and are implemented as a PC or an embedded system to be portable on the go. For example, when a user performs data communication through the wireless terminal 2, the wireless terminal 2 functions as a modem, and packets transmitted and received by the mobile communication base station 3 move with the wireless terminal 2. Via the communication base station 3, it has a structure that is transmitted and received to the server through the IWF (4). At this time, the packet loss generated through the wireless network and the data transmission / reception rate time felt by the user can be analyzed and the statistics can be directly analyzed by the user. Can be.

2 is a diagram showing a protocol structure of a wireless data performance analysis system for a mobile communication network according to the present invention. Looking at the structure, first, an application program module 11 for creating a transmission / reception packet for a user and a user packet are moved on a network. It consists of three parts of the router tracking module 12 that can track the path to be analyzed, and the analysis module 13 that can be analyzed by the corresponding protocol layer by hooking the user packets to be transmitted and received. The application program module 11 is composed of FTP, Telnet, TCP, IP, and PPP layers, which are application programs for packetizing and transmitting user data to be tested. Next, the analysis module 13 is a hooking driver 14 to intercept and buffer the packet generated by the FTP, Telnet in the middle so that the packet can be analyzed by the hooking driver 14, TCP / UDP, IP / An analysis protocol stack 15 composed of ICMP and PPP and a protocol analyzer 16 for analyzing data processed according to the corresponding stack of the analysis protocol stack 15 are provided. Next, the overall operation according to the protocol structure will be described in more detail. First, in the case of a transmission packet, a packet is generated for each layer in a user application program 11 generating a packet transmitted to a network, and the data is transmitted through the RS232 17, where the RS232 17 is a terminal and a packet. This is the serial driver which is the final path of transmission and reception. Next, the data transmitted through the RS232 17 is input to a wireless terminal and transmitted to a wireless environment. At this time, the transmission packet is hooked to the analysis module 13 by the hooking driver 14 and stored for analysis. Here, the hooking driver refers to a driver that intercepts data moved in the normal I / O path in the middle of the related I / O interface regardless of the application type. Thus, the data moved to RS232 17 and hooked regardless of the application is analyzed according to the hierarchy of analysis protocol stack 15 of analysis module 13. In the case of the received packet, the packet received from the wireless terminal to the application program module 11 is received from the terminal through the RS232 (17) to the application program module 11, in this case by the hooking driver 14 by the analysis module ( 13) This data is stored in the analysis module so that it can be analyzed and analyzed in the same way as the analysis of outgoing packets. In the case of analysis, first, the transmission / reception time, an error, and the like of the PPP layer are analyzed and stored in the analysis module 13. Next, an IP packet, which is a network layer, is analyzed. The IP packet is divided into an ICMP packet and a user packet for checking an error state of the network, and analyzed. The IP packet is analyzed in the ICMP packet and the user IP packet, and is stored in the analysis module 13 in which the analysis data is to be stored. After the packet of the IP layer is analyzed, the TCP / UDP layer, which is the transport layer, is analyzed. All the analysis is performed according to the performance index set by the user.

3 is a diagram showing the structure of data analysis software of the wireless data performance analysis system for a mobile communication network according to the present invention. FIG. 3 shows the role of each module when the protocol analyzer 16 shown in FIG. 2 is substantially implemented in software. It is as follows.

First, in the protocol analyzer, the reception thread 31 and the transmission thread 32 are always waiting to filter the packet. The hooking thread 28 is a hooking driver for moving the data hooked from the driver interface to the data area of the analysis module. Is always monitored. The hooking thread 28 is hooked by a driver through a hooking driver interface function 27 to analyze data of the reception packet buffer 23 in which the reception packet is stored and the transmission packet buffer 24 in which the transmission packet is stored. ) And the analyzer transmit packet buffer 30, and when receiving and transmitting a packet through RS232 separately from the analysis module in the user application 35, a receiving packet hooking function 21 and a sending packet hooking function, which are hooking functions By 22, the data of the packet is hooked. The overall operation process is described in more detail as follows.

First, an application program for analyzing and creating a packet to be analyzed by a analyzer and transmitting and receiving it to a wireless network. A packet generated by a user application (35) such as Telnet and FTP is connected to a terminal through an RS232 serial interface and transmitted and received independently of the analyzer. This is done. At this time, the transmission / reception packet is hooked by the hooking interface function, the transmission packet is delivered to the transmission packet buffer 24, and the reception packet is delivered to the reception packet buffer 23 and buffered. At this time, the hooking thread 28 that monitors the buffered packet in the analyzer monitors the data of the receiving packet buffer 23 and the transmitting packet buffer 24 through the driver interface function 27 to patch the received message. The function 25 and the send message patch function 26 move the data into application areas 29 and 30 that the analyzer can analyze. Next, the data stored in the application areas 29 and 30 are sequentially analyzed according to the protocol stack 33 to be analyzed by the reception packet processing thread 31 and the transmission packet processing thread 32 filtering the received packets. Finally, the analyzed data is stored in a user data structure 34 that the user can access as data presented to the user.

4 is a flowchart illustrating a measurement and analysis sequence of a wireless data performance analysis system for a mobile communication network of the present invention. First, in step 101, system variables are initialized to basically operate a system, and are created in a user program. Initializes the hooking driver for hooking the sending / receiving packet, connects the driver interface with the analyzer, and sets the user parameter that sets the current analysis conditions such as the IP address and analysis time of the connected server for analysis to the analyzer. In order to actually analyze the transmitted and received packets that are hooked into the server, a packing processing thread is executed, which is divided into a sending packet processing thread and a receiving packet processing thread. Next, in step 102, the user attempts a dialing connection to automatically connect to the server by pressing a button while the user initializes the analyzer. After dialing, as in step 103, the user can see the connection time to the IP layer and the error information of the corresponding protocol layer packet. That is, the lower protocol connection information can be viewed up to the time when the first connection packet of each layer arrived and finally the connection was completed so that the user could transmit and receive the user data packet. Thereafter, in step 104, if the IP layer is not connected within a certain time, it is regarded as a failure, and the time is databased. If the connection is completed normally, in step 105, the connection time and error rate analyzed in the connection process Analyze the database. After the connection through the processes of steps 101 to 105, a packet is transmitted and received to the corresponding server, and the FTP is attempted and executed in order to analyze while transmitting and receiving a packet (106). Here, the user program may use any application program capable of transmitting and receiving data through FTP and the Internet. Next, when FTP is executed as a representative user data transmission / reception program, the protocol analyzer causes the data analyzer to hook and analyze the data (107). Here, the connection good rate and the transmit and receive good rate while the file is transmitted and received are analyzed and provided to the user every second (108). Next, after the packet is analyzed by file transmission and reception, the analyzed result is databased so that the user can view it, thereby giving the user the ease of analysis as statistical data (109). Thereafter, a transmission and reception threshold is determined as a reference for confirming the number of transmission and reception and whether the file transmission has been executed within the time limit, which specifies the number of failures by the user, so that the user can directly select the number of retransmissions (110). Finally, a comprehensive statistics of a transmission / reception file inspection and a transmission / reception rate is output (111). In this case, the transmission / reception data used in the analysis is stored as a file in the case of FTP protocol, and the error can be reviewed by comparing the contents of the stored file with the original. It is used as statistics created by the user (111).

Next, the performance indicator and the implementation method which can be measured as the protocol analyzer of the present invention are as follows.

end. Dialing time for connecting to wireless data service

Performance indicator: Time to process data protocol by receiving connect response packet at the corresponding gateway by giving dialing command to modem.

Implementation Method: Set ATDT signal that gives dialing command to modem to 0ms, calculate the time when connect packet is received and set dialing connection time.

I. Connection time of the wireless protocol,

Performance indicator: The time when a terminal receives an IPCP Ack packet of PPP after a dialing command.

How to implement:

-Set time to 0ms simultaneously with ATDT ..... dialing in Client

-LCP ack packet reception of PPP: measured by LCP connection time

Arrival of PPP's IPCP ack packet: This time is measured as the final PPP connection time.

All. Number of packets sent and received by protocol layer

Performance indicator: Measures the number of packets generated during connection or data transmission and reception according to each layer

-Packets transmitted through the terminal are counted through the sending thread.

-Packets received from the terminal are counted through the receiving thread

-Packet Type: Packet with the corresponding protocol characteristics of LCP, IPCP, ICMP, UDP, TCP

The protocol characteristics are

How to implement:

-COUNT increase when packet is received by distinguishing ack flag of each relevant packet

-In case of TCP, the packet for TCP setup request and the packet for data transmission after setting can be distinguished.

-In case of ICMP, error messages and network information messages reported from the network during data transmission and reception are stored hourly.

la. Packet Ack time for each layer when first connected to the network

Packet type: LCP, IPCT, TCP

Implementation method

-Measure the time when the ACK packet of each layer is received

-Time measurement only when connecting packets that arrive in sequence up to TCP. Ignore subsequent packet times

hemp. Packet error

Performance Index: Packet Checksum Error

Implementation method

-Increase count when error occurs by monitoring Header Chechsum error in packet

-rejected packets monitor the rejected flag to increase the count when they occur

hemp. Round Trip Time (RTT)

Performance indicator

-The time that the server's response packet arrived in the client request packet

Implementation method

The process of sending and receiving a packet on TCP is as follows.

When a packet is delivered through a 2-way handshaking structure, the case where the Seq of the received packet corresponding to the Ack of the transmitted packet matches is set as the corresponding packet reception condition.

-TCP has a bidirectional transmission / reception condition by its characteristics, and includes interactive data transmission and bulk transmission characteristics at the same time.

-In case of interactive data transmission / reception such as telnet, RTT measurement is possible for every packet transmission / reception because sequential packet transmission / reception is performed.However, in case of bulk transmission / reception as in the case of FTP, Since a large amount of data is transmitted, in this case, only the condition where the ack of transmission and the seq of reception match is set as a condition for obtaining the RTT.

Therefore, in bulk transmission, the RTT value is arbitrary and the sampling factor is strong.

-In the above, when ack and seq coincide, the time difference between two packets is set to RTT.

bar. RTT mean time and standard deviation

Performance indicator: Cumulative mean and standard deviation for the measured RTT

Implementation method

-Random momentary packets continue to accumulate, thus satisfying the conditions of the above-mentioned RTT.

Average RTT = accumulated time / cumulative number of packets (the standard deviation is calculated in the same way)

TCP retransmission count

Performance indicator: In TCP, the client retransmits a condition of transmission error when receiving three consecutive packets of the same sequence.

Implementation method

-In case of retransmission in TCP, the client has received the same ACK packet more than 3 times consecutively from the server.

If a third consecutive reception is received, the client considers that the ack is missing and resends it.

-Therefore, set the reception of same kind of packet more than 3 times as retransmission condition.

-After retransmission, count is restarted three consecutive times.

As described above, according to the wireless data performance analysis system for a mobile communication network according to the present invention, a mobile terminal and a server have a portable structure in which a user who uses a mobile terminal can measure and analyze data traffic between mobiles. By presenting a method of obtaining performance indicators such as the time required for connection between them, it is possible to analyze the data quality and the data between mobiles according to the local location of the mobile communication network and to present the indicators that enable users to provide better quality data service. There is.

Although the preferred embodiment of the present invention has been described above, the present invention can be applied by horizontally modifying a method of extracting necessary information from a user interface and a protocol stack for various measurement purposes. It is clear that the present invention can be applied equally for more precise measurement by appropriately modifying the above examples. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the appended claims.

Claims (6)

A wireless mobile communication terminal connected to a wireless network system; Protocol analysis means for intercepting and analyzing wireless data packets which are connected to the mobile communication terminal and transmitted and received over a wireless section; A mobile communication base station communicating with the wireless mobile communication terminal over a wireless section; An IWF (Inter-working Function) which is connected to the mobile communication base station and is a protocol switching device between a wired section and a wireless section; A wireless data performance analysis system for a mobile communication network comprising a data server on the Internet that can process user data sent from the protocol analysis means and send a response to the protocol analysis means through the IWF and the Internet. Means, Application program means for producing a transmit / receive packet for a user; Router tracing means for tracing a path along which a transmission / reception packet made by said application program means travels on a network; And an analysis means for hooking the transmission / reception packet for the user and performing analysis according to a corresponding protocol layer. The method of claim 1, wherein the analysis means, A hooking driver for intercepting and buffering packetized user data in the middle; An analysis protocol stack for analyzing data processed by the hooking driver by a protocol analyzer according to the stack; The protocol analyzer for analyzing each layer of an input / output packet by the analysis protocol stack; Wireless data performance analysis system for a mobile communication network, characterized in that it comprises an analysis data storage means for storing the data analyzed by the protocol analyzer. The method of claim 2, The analysis protocol stack is a wireless data performance analysis system for a mobile communication network, characterized in that the PPP layer, IP / ICMP layer and TCP / UDP layer. The method of claim 2, The protocol analyzer is a wireless data performance analysis system for a mobile communication network, characterized in that executed in accordance with the performance indicators set by the user. The method of claim 2, The performance indicators include the wireless protocol connection time, the number of packets transmitted and received by protocol layer, the packet response time, packet error, RTT (round trip time), RTT average time and standard deviation, and TCP retransmission count for each layer when the network is first connected. Wireless data performance analysis system for a mobile communication network, characterized in that one. In the protocol analysis method for analyzing the performance of wireless data for mobile communication network, Initializes the system variables to operate the analysis system, initializes the hooking driver to hook the sending / receiving packets made by the user program, connects the driver interface with the protocol analyzer, and connects the server's IP address and analysis time. An initialization step of setting a current analysis condition in the protocol analyzer and executing a packet processing thread for analyzing a transmitted / received packet hooked to the protocol analyzer; In the state where the user initialized the protocol analyzer, pressing a button to attempt a dialing connection to automatically connect to the server, Extracting, by the user, lower protocol connection information such as connection time and error to the PPP layer and IP layer after the dialing connection; Checking whether the IP layer is connected within a predetermined time, and if not, database the corresponding time as a failure, and if connected, analyzing and analyzing the connection time and error rate analyzed in the connection process; Attempting an FTP connection by making a packet transmitted / received to the corresponding server after connecting through the previous step; When FTP is connected and executed, sending and receiving data, and analyzing and hooking the data by a protocol analyzer; Analyzing and providing a connection good rate and a good transmit and receive rate to the user while the data is transmitted and received; Storing the analyzed data in a database so that the user can view the data; Checking whether the data transmission / reception is a file transfer within a limited time and the number of transmission / reception and a time limit, Attempting to connect to the FTP again if the regular data transmission and reception is beyond the limited threshold, and if the threshold is not within the threshold, checking the error by comparing the stored file of the transmission and reception data with the original, and producing a comprehensive statistics of the transmission and reception rate Protocol analysis method for analyzing the performance of wireless data for mobile communication network.