Design Of The Wireless Residential Gateway Base On Embedded Platform

With the rapid development of the information appliance industry,modern people chase higher quality life.Traditional concept of the appliances can't meet the need that people pursuing high-quality modern life.However, these requirements can not be separated from home network, and embedded wireless home Gateway is the core of the whole home network system. its major figure is to connect the home internal network and public network together,and provide a platform for Internet access, remote control, as well as connecting the heterogeneous subnet in th house. Then the gateway combination of embedded technology, short-range wireless communication technology has become the focus of the study.The domestic and foreign information appliances, as well as the development of this industry's trend is analyzed; the reducing the cost of home gateway to meet the market demand approach is discussed; the hardware and software composition of embedded wireless home gateway are focused on; the embedded wireless home gateway systems are designed and implemented based on the short 2.4GHz wireless communication technology.AT91SAM7X256 is select as master chip to meet the low cost and the performance requirements on the hardware system. The FLASH and SDRAM aren't needed to plug in for storage expansion.RTL8201L is chosen as PHY chip.STC series single-chip microcomputer and TI's CC2500 RF transceiver chip are chosen for giving a low-cost, low power consumption solution of wireless node.The node can be used in the indoor environment to transmit control and status information.In this system, home network and external network communicate with each other by PSTN or Ethernet.The gateway and wireless transceiver node using RS-232 for communication;.Wireless transceiver nodes with various information appliances using 2.4Ghz band wireless network communication.TheμC/OS-II is introduced to the software to improve the concurrency and the response time of the system. In software design, it also applies watchdog timer, software trap, as well as adds summation check in the communication protocol to improve the system performance. Furthermore, based on internet technology, a reduced TCP/IP protocol is transplanted in the embedded real-time operating system.And website offlines are stored at Gateway, which enable the possibility of communication between the home gateway and external Internet network,and Web service in a family is also available.Therefore,it is possible for user to log in the host web page through the web browser whenever he is.Thus,remote control on appliance is implemneted.