Research And Implementation Of Smart Home Gateway Based On SIP

With the development of information technologies including wireless communication,IoT,mobile calculation and cloud service,the smart home is becoming the focus of a large number of researches.Since many Hi-tech companies join this area,new smart home products and solutions are created continuously,which implicates a large market in the future.This paper analyzed the development statues in both domestic and foreign markets and described present researches and relevant technologies.Based on the gateway of the smart home and the function requirement of key technologies,this paper provided a gateway solution based on SIP,which has the characteristics of high expandability,multi-communication integration,and voice control.The gateway can be divided into hardware section and software section.The hardware platform of the hardware section is tiny6410 that adopted ARM 11 structure,which is mainly responsible for the task assignment and data processing.The Zigbee wireless communication module is designed based on CC2530 chip.This module contained two parts:the coordinator and terminal node.The coordinator is designed to decode the the upload data,repackage them and send them to the main processor.It is also responsible for sending orders to specific nodes.The terminal node collects and sends the sensor data and receive and execute orders.In addition,WiFi module contains access node and terminal node,where the access node adopted EDUP WLAN card for terminal node accessing and data communication,and the terminal node adopted the ESP8266 communication module for data uploading and control order receiving.The voice identification module in this design is consist of LD3320,which is responsible for identifying different human voice and generating relative control orders.The software part of this design is designed in the embedded Linux platform.In this part.The SIP communication is implemented based on open source PJSIP protocol stack.Moreover,the GUI is designed based on QT and QT Creator,which provides users a touching operation function.In the end,the function of ZigBee module,WiFi module and voice identification module are programmed in the Keil and IAR environment.The design of smart home gateway implemented the integrated communication for the internal and the external network by developing SIP UA based on SIP,and it also used the characteristics of SIP to make the gateway support the transmission of media stream.In addition,the gateway realized the Zigbee networking and WiFi networking,and provided a visible HMI,which allow users to observe and manage the smart home device on the gateway.Moreover,it combined the voice identification technology to provide voice control function,which further indicated the smartization of this design.In the end,the experiment test proved the feasibility of this design.