Research Of UPnP Protocol And Implement Of AV Framework

Home information technology is the important field where the information technology will advance. Information home is the basic unit of the information society. The development of digit technology accelerates the appearance of information appliances, which demand connection, communication and cooperation among them. Internet technology advancement makes home a network from a network joint, which is named home network and connects all sorts of information appliances. Home network is close to people life, and it is a typical edge network. Although the scale of single home network is small, the total home network has a large percentage in global. Home network has made much progress now. The key of home network realization is the home network middleware technology. Many famous information device corporations have provided their own new technology and new means to resolve it, for example, Microsoft corp. has provided UPnP, Sun corp. has provided Jini, Sony corp. has provided HAVi, Alcatel corp. has provided OSGi. It will play a great realistic role in improving home information level to research these new technologies, to resolve the problem of connection, communication and cooperation among information appliances, and to realize simple connection and simple control. They will accelerate the popularity of information appliances and the advancement of home network.Home network middleware is designed to make the application on higher layer independent of any hardware and network technology on the lower layer of information appliances, and to provide a universal application program interface for the application on the higher layer, and to realize simple connection and intelligent control among information devices. The UPnP technology is typical in all home network middleware technologies. It bases on TCPIIP protocols and WEB technology, makes use of some existing network technologies and protocols, such as XML, SOAP, GENA and so on. With UPnP, a device can dynamically join a network, obtain an IP address, convey its capabilities and learn about the presence and capabilities of other devices--all automatically. And a device with UPnP can communicate with other devices and control...