Research on New Generation of Internet of Things Gateway

introduction

As sensor technology continues to develop and mature, and costs continue to decrease, multi-source perception systems will significantly change the data acquisition system and the interface between users and portable electronic products. OEMs that have led this trend have clearly stated that they hope to use these sensors to realize the user's dynamic perception of information anytime, anywhere. These modern sensors provide the perception capabilities required by design engineers and change the data acquisition system and the way humans interact with each other.

Mainly research the key technologies of the new generation of Internet of Things based on ZTE smartphone platform. It is intended to be used for the research and development and verification of key technologies of the Internet of Things, and provides a reference basis for ZTE Tongxun to develop a new generation of smart phone products. Through the communication between the ZTE smartphone and the entire Internet of Things system, functions such as mobile phone navigation, mobile subscription, environmental monitoring, label recognition, target perception and positioning can be realized. The products of the research results will further expand the functions of the mobile phone, and can be widely used in many fields such as industry and commerce, home life and so on.

1 Overall plan

This project is a conceptual platform for 4G mobile phones in the future. Mobile phones are used as application gateways for mobile Internet and wireless sensor networks. A large number of access protocols and data transmission protocols are required for device access control and data communication. For the simulation and simulation experiments, the technical scheme of multi-protocol fusion is proposed in this paper, so that the smart phone platform can play a role in various occasions.

This system is composed of intelligent mobile information gathering terminal and ZTE smartphone. Through the wireless network, the system can collect and transmit multi-source data in real time. The mobile phone can collect and control multi-source data as needed, so that the surrounding wireless sensors can perform dynamic data exchange with the mobile phone.

This design combines wireless sensor technology and embedded software and hardware technology, using RFID Reader, Youxian sensor terminal module, Wi-Fi module, WAPI module, ZigBee module, GPS module in an external expansion mode to ensure that the ZTE smartphone platform Real-time collection of sensor modules. In this study, a high-precision voltage reference chip is used to provide a reference voltage reference for the system signal acquisition. The system completes the perception of on-site temperature and humidity through the ZigBee module; and the Bluetooth Bluetooth (IEEE 802.15) module is used to realize the multi-source information of the evaluation board to ZTE Wireless transmission of smartphones. The main supporting technologies of the system are embedded technology, wireless local area networking technology, multi-protocol processing, human-computer interaction interface, RFID, etc., which realizes an automated, information-based multi-function information-aware application system with a smart mobile platform terminal as the core .

2 System architecture

The main supporting technologies of this system are: embedded technology, wireless local area networking technology, multi-protocol processing, human-computer interaction interface, RFID, etc., which realizes the automation and information multi-functional information perception with the intelligent mobile platform terminal as the core operating system. Its system network structure is shown in Figure 1. This network structure is also a prototype of the future development of the Internet of Things.

In the system structure of Fig. 1, the mobile phone acts as an important terminal, reaches the gateway device through the Bluetooth device, and then the gateway device connects the ZigBee network, electronic label, 3G network, Wi-Fi / WAPI network, Beidou network and other networks and devices The perfect network integration and technological innovation fully embodies the concept of the Internet of Things in which real objects are connected to the Internet through radio frequency identification and other information sensing equipment to realize intelligent identification and management.

Embedded system development is divided into two parts: software development and hardware development.

The hardware modules currently mainly include ARM9-S3C2440 development board, BC4RS 232 serial port Bluetooth adapter, RC500 non-contact IC card development board, ZigBee module, M2M module, smart Bluetooth mobile phone. The core of the development board is an ARM processor. The processor has a tailored Linux system and a corresponding C language program. Due to the control of the operation of the equipment of the entire system and the processing of the data of each sub-network. SDRAM and FLASH are connected with S3C2440, used as cache and stored program. The Bluetooth wireless transmission interface distributed around the processor can communicate with the ZTE smartphone through Bluetooth through the virtual serial port. The ZigBee module is used to receive instructions from the ARM processor and send them to the ZigBee network. At the same time, it can receive the messages returned by the ZigBee network. The function of the RFID interface module is similar to the interface module of ZigBee. It is also used to receive the instructions of the processor and the messages returned by the RFID network and send them to the other end. ZTE Mu301 is connected to the M2M module through the USB interface. The mobile terminal uses the application program on the JAVA virtual machine developed by J2ME to use Bluetooth's virtual serial communication protocol to communicate with the Bluetooth module interface on the development board.

Embedded systems generally adopt the "host / target board" development model during development, that is, use the rich software and hardware resources on the host machine (PC) and a good development environment and debugging tools to develop the software on the target board, and then Generate the target code and executable file through the cross compilation environment, download it to the target board through serial port / USB / Ethernet, etc., use the cross debugger to run the monitoring program, analyze it in real time, and finally, download and solidify the program to the target machine to complete The entire development process. In software design, the embedded system development flow chart designed for the combination of ARM hardware environment and ADS software development environment. The entire development process basically includes the following steps:

(1) Source code writing: writing source C / C ++ and assembler;

(2) Program compilation: Compile the program through a dedicated compiler;

(3) Software simulation debugging: simulate software operation in SDK;

(4) Program download: download to the target board through JTAG, USB, UART;

(5) Software and hardware testing and debugging: joint debugging procedures through JTAG and other methods;

(6) Download and solidify: the program is correct and downloaded to the product for production.