KR100582889B1 - Zigbee Packet Analysis Device - Google Patents

Abstract

The present invention relates to a ZigBee packet analysis apparatus for capturing and analyzing packets in a signal transmitted wirelessly according to the ZigBee protocol and displaying them according to a user's request. The apparatus of the present invention is a ZigBee packet analysis apparatus for wirelessly capturing and analyzing packets between ZigBee devices that communicate wirelessly according to the ZigBee protocol, and receives, demodulates and decodes a radio signal output from the ZigBee device. ZigBee sniffer board that extracts packets and ZigBee sniffer board receives packets from ZigBee sniffer board, analyzes them, stores them in database and displays them on the screen in various ways according to user's request. It is composed. Therefore, the Zigbee packet analysis apparatus according to the present invention is not only a packet of the physical (PHY) and medium access control (MAC) layer of the low-speed wireless personal network (LR-WPAN) but also a network and application support layer (APS), ZigBee objects ( By analyzing packets for all layers of Zigbee protocol stack such as ZDO) and displaying them on the screen in user's desired way, it is possible to precisely measure and test the characteristics of Zigbee device by enabling precise analysis of packets according to Zigbee protocol. There is an advantage.

Zigbee, Packet Analysis, Hierarchical, Sniffer Board, Zigbee Object

Description

Zigbee packet analyzer             

1 is a use state diagram of a Zigbee packet analysis apparatus according to the present invention,

2 is a detailed block diagram of the sniffer board shown in FIG.

3 is a functional block diagram of a PC shown in FIG. 1;

4 is an example of an output screen according to the present invention;

5 is a block diagram illustrating a ZigBee RF receiver shown in FIG. 2;

6 is an operation flowchart of the sniffer board shown in FIG.

7 is an operation flowchart of the packet analysis program shown in FIG. 1;

8 is a signal flow diagram of the sniffer board and packet analysis program shown in FIG.

9 is a Zigbee stack structure shown for explaining the present invention,

10 is a format of a beacon frame shown for explaining the present invention,

11 is a format of a data frame shown for explaining the present invention;

12 is a format of a response frame shown for explaining the present invention;

13 is a format of a command frame shown for explaining the present invention.

* Explanation of symbols for main parts of the drawings

10-1,10-2: Zigbee Device 20: Zigbee Packet Sniffer Board

30: personal computer 30a: packet analysis program

21: antenna 22: Zigbee wireless receiver

23: MCU 24: communication connection

The present invention relates to a packet analysis apparatus, which is a kind of wireless communication measuring instrument, and more particularly, to a Zigbee packet analysis apparatus for capturing and analyzing a packet from a signal transmitted wirelessly according to a Zigbee protocol and displaying the packet according to a user's request. will be.

ZigBee, which is of increasing interest in recent years, is a standard designed for industrial and home automation applications such as factory workshop systems, farm watering systems, or home thermostats. The application is expected to expand its reach and be well received by toy, game consoles, consumer electronics device and PC peripheral manufacturers.

In the research and development and production of Zigbee's products, a packet analyzer is required as a wireless measuring instrument in order to evaluate the performance of the Zigbee device. There is no domestic product as a conventional packet analysis device for Zigbee, and Chipcon of USA The company's product is known.

The currently known Chipcon packet analysis device (cc2420 DK) of the US is the standard for the physical (PHY) and medium access control (MAC) layers of the low-speed wireless personal network (LR-WPAN). Packet sniffer of data and command frame of 802.15.4 MAC, and has the function of capturing and outputting communication between devices equipped with IEEE 802.15.4 MAC software. have. In addition, the MAC software installed on the cc2420 is a source program that implements the IEEE 802.15.4 specification, and is currently being released to members, with versions 0.5 and 0.62 released. In the case of version 0.62, about 70% of the IEEE 802.15.4 MAC is implemented, and it is known that the version upgrade will be implemented to implement the unimplemented portion of the IEEE 802.15.4 MAC.

However, these products are only packet analysis devices focused on the physical (PHY) and medium access control (MAC) layers (IEEE 802.15.4 MAC) of the low-speed wireless personal network (LR-WPAN). The implementation of software for packet analyzers, including the physical layer of the LR-WPAN (IEEE 802.15.4 MAC) and the entire layer of the Zigbee stack, has not yet been implemented. It is not known abroad.

The present invention has been proposed to meet the above necessity. In order to accurately test a ubiquitous network environment, a physical (PHY) of a low-speed wireless personal network (LR-WPAN) capable of recognizing and testing the flow of an accurate communication protocol can be tested. And a Zigbee packet analyzer for a medium access control (MAC) layer (IEEE 802.15.4) and a Zigbee protocol.

In order to achieve the above object, the apparatus of the present invention is a ZigBee packet analysis apparatus for wirelessly capturing and analyzing packets between ZigBee devices that communicate wirelessly according to a ZigBee protocol, wherein the wireless signal is output from the ZigBee device. Zigbee sniffer board that receives and demodulates signals, decodes and extracts packets, receives packets from the Zigbee sniffer board, analyzes them, stores them in database, displays them on the screen in various ways according to user's request ZigBee packet analysis means for providing an analysis information is characterized in that.

The Zigbee sniffer board may include: a Zigbee wireless receiver configured to receive and decode wireless signals transmitted from the Zigbee devices through an antenna; and a microcontroller configured to decompose data received from the Zigbee wireless receiver to decompress a packet; And a communication connection unit for interfacing the microcontroller with the ZigBee packet analyzing means, wherein the ZigBee packet analyzing means comprises a packet analysis program mounted on a personal computer and a personal computer, wherein the packet analysis program is provided from the sniffer board. A collection module that collects the data transmitted through the interface, performs an UART or USB interface function, an analysis module that analyzes the data transmitted from the collection module, and classifies and stores data and command frames for each layer; and the analysis It consists of a filtering module that filters the classified packets according to the user's request and provides them to the screen.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the Zigbee stack structure will be briefly described to facilitate understanding of the present invention. As shown in FIG. 9, the Zigbee stack includes a physical (PHY) layer (L1), a medium access control (MAC) layer (L2), a network (NWK) layer (L3), and an application (APL) layer (L4). The application (APL) layer L4 is composed of an application support layer (APS: L41), a Zigbee object unit (ZDO: L42), and an application object unit (L43). Here, the physical layer (L1) and the medium access control layer (L2) is a standard "IEEE 802.15.4" standard for the physical (PHY) and medium access control (MAC) layer of the low-speed wireless personal network (LR-WPAN) The other higher layers are being drafted by the ZigBee Alliance.

Referring to FIG. 9, the network layer L3 manages network, security, routing, and the like, and the application support layer layer (APS) maintains a table for binding. In this case, the binding is a ZigBee coordinator to recognize the connection between the devices of the network to improve the coordinator monitoring and control. The application support layer (APS) services the operation of transferring messages between connected devices, supports the discovery operation of identifying the address and service of the device and security management in the APS layer.

1 is a diagram illustrating a use state of a ZigBee packet analyzing apparatus according to the present invention, and shows packets transmitted and received between a ZigBee device 1 (10-1) and a ZigBee device 2 (10-2) communicating with each other according to the ZigBee protocol. The overall configuration of the Zigbee packet sniffer board 20 according to the invention is captured and output through the personal computer 30 is shown.

Referring to FIG. 1, the Zigbee Device 1 (10-1) and the Zigbee Device 2 (10-2) transmit and receive data packets or command packets wirelessly according to the Zigbee protocol. At this time, according to the Zigbee protocol specification, the frequencies of the radio signals transmitted and received are approximately 2.4 GHz and 868/915 MHz. As described above, in order to monitor packets transmitted and received between the ZigBee device 1 (10-1) and the ZigBee device 2 (10-2), the ZigBee packet sniffer board 20 according to the present invention is each ZigBee device (10-1, 10-2) Receives and demodulates the radio signal outputted from the packet) and decodes the packet, and a personal computer (laptop-type or desktop-type) 30 equipped with the packet analysis program according to the present invention is provided from the packet sniffer board 20. After receiving the packet, it is analyzed and stored in the database, and it is displayed on the screen in various ways to provide analysis information according to the user's request.

FIG. 2 is a detailed block diagram of the sniffer board shown in FIG. 1, and the sniffer board 20 according to the present invention uses a radio signal transmitted from ZigBee devices 10-1 and 10-2 to the antenna 21. It is composed of a Zigbee wireless receiver 22 to receive and decode through a microcontroller (MCU: 23), a communication connection unit (UART / USB: 24).

Referring to FIG. 2, the Zigbee wireless receiver 22 processes a low noise amplifier (LNA) 221 and an output of the low noise amplifier 221 into a positive phase signal and a quadrature phase signal, respectively, as shown in FIG. 5. And a quadrature phase processing portion, a quadrature phase processing portion, a digital decoder 226, a microcontroller interface portion 227, and a local oscillator 228. The positive phase processing portion is composed of a positive phase mixer 222I, a bandpass filter (BPF: 223I), a variable amplifier 224I, and an analog-digital converter (ADC: 225I), and the quadrature phase processing portion is a quadrature mixer ( 222Q), a bandpass filter (BPF: 223Q), a variable amplifier 224Q, and an analog-to-digital converter (ADC: 225I).

Referring to FIG. 2, the local oscillator 228 provides the positive phase local oscillation signal I and the quadrature oscillation signal Q, and the low noise amplifier 221 low noises the radio signal received through the antenna 21. Amplify. The positive phase mixer 222I mixes the output of the low noise amplifier 221 with the positive phase local oscillation signal I to output a sum and difference signal, and the bandpass filter 223I outputs a difference signal among the sum and difference signals. Select and pass band. The variable amplifier 224I amplifies the output of the bandpass filter 223I to an appropriate level, and the analog-to-digital converter 225I converts the analog output signal of the variable amplifier 224I into digital and provides it to the digital decoder 226. .

The quadrature mixer 222Q mixes the output of the low noise amplifier 221 with the quadrature local oscillation signal Q to output a sum and difference signal, and the bandpass filter 223Q outputs a difference signal among the sum and difference signals. Select and pass band. The variable amplifier 224Q amplifies the output of the bandpass filter 223Q to an appropriate level, and the analog-to-digital converter 225Q converts the analog output signal of the variable amplifier 224Q into digital and provides it to the digital decoder 226. .

The digital decoder 226 receives and decodes the digitally converted positive phase signal and the quadrature signal, and transmits the decoded signal to the microcontroller 23 through the microcontroller interface 227.

In the exemplary embodiment of the present invention, the Zigbee wireless receiver 22 may use a CC2420 chip of ChipCon Corporation, and the microcontroller 23 may use an ATMEL 128L, which is an 8-bit RISC processor equipped with 128M of flash memory.

3 is a functional block diagram of the PC 30 shown in FIG. 1, the packet analysis program 30a providing a packet analysis function according to the present invention includes a collection module 31, an analysis module 32, a filtering module. 33, and the user interface module 34.

Referring to FIG. 3, the collection module 31 collects data transferred through the MCU 23 and performs an interface function of the MCU 23 and the UART or USB method. In the embodiment of the present invention, the interface between the MCU 23 of the sniffer board 20 and the PC 30 is a UART, but a USB or other standard communication interface may be used.

The analysis module 32 analyzes the data transmitted from the collection module 31 and classifies and stores data and command frames for each layer. The classified packets are filtered by the filtering module 33 according to a user's request to provide a user-oriented interface screen as shown in FIG. 4.

Next, the operation of the packet analyzer of the present invention configured as described above will be described in detail with reference to FIGS. 6 to 13.

6 is an operation flowchart of the sniffer board shown in FIG. 1, FIG. 7 is an operation flowchart of the packet analysis program shown in FIG. 1, and FIG. 8 is a signal flowchart of the sniffer board and packet analysis program shown in FIG. 1.

First, in order to use the packet analysis apparatus according to the present invention, as shown in FIG. 1, a sniffer board 20 and a PC 30 are connected to configure a test environment.

When the power of the sniffer board 20 is turned on, the sniffer board 20 receives a radio signal output from the Zigbee devices 10-1 and 10-2 under the control of the PC 30, and then demodulates and decodes the packet. And extract the extracted packet (601 to 605).

The PC 30 establishes a connection with the sniffer board 20 when the packet analysis program is driven, and provides a menu selection screen for the user and the interface when the connection is successful (701 to 704). On the menu selection screen, the user decides and sets the layer of the packet to be analyzed, sets the output direction to On Screen, and selects Analyze. Then, the packet is received from the sniffer board 20, analyzed, and stored. 705-710).

In the Zigbee protocol analyzed according to the present invention, a frame is divided into a beacon frame for transmitting a beacon in the coordinator, a data frame for transmitting data, and a response frame for notifying the other party when a frame is successfully received, and a MAC command frame. .

As shown in FIG. 10, the packet format of the physical layer is composed of a preamble sequence, a start of frame delimiter, a frame length, and a physical layer service data unit (PSDU). The packet format of the media access control layer is frame control, sequence number, addressing field, superframe specification, GTS field, and pending address field. , Beacon payload, and frame check sequence (FCS).

As shown in FIG. 11, the packet format of the physical layer includes a preamble sequence, a start of frame delimiter, a frame length, and a MAC layer data unit (MPDU). The packet format of the media access control layer includes a frame control, a sequence number, an addressing field, a data payload, and a frame check sequence (FCS).

As shown in FIG. 12, the packet format of the physical layer includes a preamble sequence, a start of frame delimiter, a frame length, and a MAC layer data unit (MPDU). The packet format of the media access control layer consists of a frame control, a sequence number, and a frame check sequence (FCS).

As shown in FIG. 13, the MAC command frame has a packet format of a physical layer including a preamble sequence, a start of frame delimiter, a frame length, and a MAC layer data unit (MPDU). The packet format of the media access control layer includes frame control, sequence number, addressing field, command type, command payload, and frame check sequence. FCS).

The packet analyzing apparatus of the present invention analyzes each packet of the above frame for each layer and displays them by classifying the desired layer according to a user's request.

As described above, the ZigBee packet analysis apparatus according to the present invention is not only a packet of the physical (PHY) and medium access control (MAC) layer (IEEE 802.15.4) of the low-speed wireless personal network (LR-WPAN) but also the network and It analyzes packets of all layers of Zigbee protocol stack such as APS, ZDO, etc., and displays them on the screen in user's desired way, enabling precise analysis of packets according to Zigbee protocol. This allows the ZigBee device to accurately measure and test the characteristics of the Zigbee device.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (6)

A Zigbee packet analysis apparatus for wirelessly capturing and analyzing packets between Zigbee devices communicating wirelessly according to a Zigbee protocol, A Zigbee sniffer board for receiving and demodulating and decoding a radio signal output from the Zigbee device to extract a packet; ZigBee packet analysis, comprising a ZigBee packet analysis means for receiving a packet from the ZigBee sniffer board, analyzing the packet, storing it in a database, and displaying the information on the screen in various ways according to a user's request. Device. The method of claim 1, wherein the Zigbee sniffer board A Zigbee wireless receiver configured to receive and decode wireless signals transmitted from the Zigbee devices through an antenna; and A microcontroller that decomposes the data received from the Zigbee wireless receiver and extracts a packet; And And a communication connection unit for interfacing the microcontroller with the Zigbee packet analysis unit. The method of claim 2, wherein the Zigbee wireless receiver A local oscillator that provides a positive-phase local oscillation signal and a quadrature-phase oscillation signal, a low-noise amplifier that amplifies the radio signal received through the antenna with low noise, and mixes the output of the low-noise amplifier with the positive-phase local oscillation signal to add up and difference. A phase-phase mixer for outputting a signal, a bandpass filter for selecting and passing a difference signal band among sum and difference signals, a variable amplifier for amplifying the output of the bandpass filter to an appropriate level, and an analog of the variable amplifier An analog-to-digital converter for converting an output signal to digital, a quadrature mixer for outputting a sum and difference signal by mixing the output of the low noise amplifier with a quadrature local oscillation signal, and a difference between sum and difference signals of the quadrature mixer A bandpass filter for selecting and passing a signal band and amplifying the output of the bandpass filter to an appropriate level; An amplifier, an analog-to-digital converter for converting the analog output signal of the variable amplifier into a digital signal, and a digital decoder for receiving and decoding the digitally converted positive phase signal and quadrature phase signal and outputting the decoded signal to a microcontroller. Zigbee packet analysis device. The method of claim 2, wherein the communication connection unit Zigbee packet analysis device, characterized in that the UART or USB method. The method of claim 1, wherein the Zigbee packet analysis means It consists of a personal computer and a packet analysis program installed in the personal computer, The packet analysis program A collection module for collecting data transmitted from the sniffer board and performing a function of UART or USB interface; An analysis module for analyzing data received from the collection module and classifying and storing data and command frames for each layer; ZigBee packet analysis apparatus comprising a filtering module for filtering the packets classified by the analysis module according to a user's request to provide a screen. The method of claim 5, wherein the packet analysis program ZigBee packet analysis apparatus characterized in that the received packet is classified and provided by layers such as physical layer, MAC layer, network layer, APS layer, ZDO layer.

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