【 Weak current College 】 intelligent home system design discussion on key technology

Introduction
The computer technology, modern communications technology into traditional household appliances yielded a new generation of electrical household appliances — information appliance, it is an information access, acquisition, storage, processing, networking and consumer electronics products, information appliances to break only through the Internet to get information, heralds the arrival of the PC era after. In the design of intelligent home system there are several key technology has been the industry's research and discuss the hot key, the following I will this key technology listed, views for your reference. Family establishment of the internal network
The family network, mainly to solve various information appliance between the data transfer, can the external connection for incoming data transmission to the appropriate home appliances, and also to internal data transfer to the external network. Current family intranet has many kinds of solutions, mainly for wired and wireless. Wired mode:
· Electronic carrier X-10 and CEBUS;
HomePNA · telephone line;
· Ethernet IEEE802.3 and 802.3u;
· Serial bus USB2.0 and USB1.1, IEEE1394. Wireless mode:
· Wireless LAN IEEE802.11b IEEE802.11a and;
· Family of RF technology; HomeRF
· Bluetooth IEEE802.15;
· Infrared IrDA. Home networking technology reference factors:
· The complexity of the connection object. In the home network with audio, video phone, high-speed data equipment, refrigerators, washing machines, PDA, etc in the rate data devices, while also exist three table CC, fire alarm, low rate data devices.
· Based on open standards. Including the technical documentation and the openness of the architecture.
· Compatible with a wide range of connection technology.
· The needs of users. Low-cost, easy-to-use, highly reliable, flexible, and scalable, good compatibility, support for multiple applications. According to the characteristics of the technology, can reach the following conclusions: a variety of networking technologies will coexist on the market, various internal networking technology will find its own adaptation. For entertainment applications such as audio and video, ask the network to provide high-bandwidth, real-time, synchronous transmission rates of up to 50Mbps {HotTag} USB2.0 and IEEE1394 is the best choice. For computing and data communications applications, such as PC, white goods, voice services, transfer rates require dozens of kbps to dozens of Mbps, a variety of technologies can meet data transmission, wireless technology can avoid the annoyance of rewiring, therefore is the best choice. For home automation-control applications, such as three table CC, anti-theft alarm system, fire protection, bandwidth requirements on the decades kbps, and products geographically dispersed, cabling, power line and wireless encoding technology is the best choice. Using Jini and OSGI standard
Family network is a dynamic environment, when a new device to a home network, should be the network of other equipment identification, at the same time it also be able to find other devices on the network. In order to achieve device Plug-and-Internet, Sun introduces the JiNi technology. JiNi is a group of devices and software components combined into a single, dynamic, distributed systems, based on Java, Jini is a service-oriented (including hardware and software resources) of middleware technologies that run on TCP/IP protocols that run across platforms, independent of the underlying operating system and communication technology, the device can query each other, understanding of the function, a home network without human intervention, the network settings can be done automatically. Because of the Jini is ideal for home network environment, SONY, Philips, Inprise, many manufacturers have applied for Jini licenses, Jini applications render a thriving scene. Open Services gateway (Open Service Gateway Initiative, OSGI) by IBM, HP, Philips, Sun, telecommunications, computer, electrical giant launched, the main function is to connect the Internet business services and next-generation intelligent apparatus defined an open standard. OSGI application with platform-independent, independent, highly secure, multi-tasking, compatible with different LAN Protocol (such as Bluetooth, IEEE1394), and supports multiple device connection technology (UPNP, Jini) advantages. The major components of the OSGI architecture include: service gateways, service provider, service integrators, gateway operator, wide area and local area networks and connected devices. Home Gateway design issues
Intelligent Home system is the core family gateway (Residential Gateway), in the family offer different types, different structures of bridging ability, so that these subnet information appliances can communicate between; in family outside with various Internet service providers will be concatenated to provide real-time, two-way, broadband access, and also provides firewall capabilities, block outside the family unit of illegal access and attacks.

· Home gateway implementation: can information appliance (network refrigerator, set-top boxes), or build a dedicated home gateway implementation, including private home gateway more development prospects.
· Home Gateway do: home gateway should implement internal network interconnection, information storage, equipment monitoring, data, calculations, and external network services, network security 3W. · Home Gateway Protocol hierarchy: one of the first and second floors of the standard has been enacted, and in practice, the third layer is the industry's research focus, the fourth tier to the application layer, may act according to the function of the customization, the fifth floor is the UI layer, including manual switches, remote control interface, generic software interface, and so on, it's simple to use directly affects the performance of intelligent home system, there is currently no uniform standards. Residential gateway software design
Including real-time operating system is the core of the entire software system, it is responsible for process scheduling, memory management, device management, real-time monitoring and Bluetooth, IEEE1394 ADSL hardware drivers. In the real-time operating system layer above the TCP/IP module, you can include an embedded database, Chinese environment modules, graphics, interfaces, etc. API interface design includes a variety of middleware (HAVI, Jini, UPNP, OSGI, etc.) of software design. To meet the needs of users, you can design a variety of applications such as DVD players, browsers, home security, three table CC, etc, for home security and entertainment purposes. Home network application proxy-body technology
Network home appliances, low-cost, high quality and reliability is the intelligent home system design important conditions for success, the agent of this aspect of the technology was successfully applied.
You can run the agent in the home server, to different private Internet Protocol to connect to a network of different technologies. And the entire control algorithm into different circumstances control agent, each agent tasks simple, when you need a proxy, they pass it on to the control of the device, so the required memory space is very small. Conclusion
Current smart home systems research and design proposals, there are still many issues to be resolved, as there is no unified interoperability specification, network integration is more complex, the home user interface specification of a lack of research, but with the associated technology continues to progress, it will inevitably toward scheduling intelligence, flexibility and interoperability, thus entering the common people.