introduction
It is foreseeable that the next few years will be a rising period for the development of broadband networks and the popularity of home networks. With the global integration trend of 3C (Cornputer, Communication, Cosumer), digital home network systems will be computers, digital home appliances and mobile information terminals through wired Or wireless network for seamless collaboration.
In the current digital home network, in addition to PCs and home gateways / routers, media adapters and media servers have emerged. These new devices divert many media processing tasks from the PC to form a centerless network structure. The three heterogeneous networks of control network, digital data network and home A / V network together form a home high-speed information network to achieve network access, anti-theft alarm, automatic control management of indoor appliances, access control intercom, remote copy Watches, remote Web monitoring, video on demand, etc. have become a research hotspot in the field of information technology.
l Main research content of digital home network system
1.1 Basic functions of digital home network system
The digital home network extends the public network functions and applications to the home through the home gateway, and connects a variety of terminal devices with a flexibly configurable home intelligent wiring system to provide integrated voice, data, multimedia, control, and management functions. Achieve full circulation and sharing of information between the terminal inside the home and the external public network and the terminal inside the home. It has the following functions:
The home gateway can simultaneously connect multiple or different types of access technologies, such as supporting ADSL and LAN access. In terms of system functions, it can simultaneously handle multiple types of access network technologies and multiple types of network technologies.
The home network is divided into three parts: home control network, digital data network, and home A / V network. These three networks have obvious differences in transmission rate, bandwidth requirements, transmission media, security requirements, and QoS (network service quality) requirements. Therefore, it can be constructed using a variety of technologies. The home control network uses PLC power line carrier technology based on the X-10 bus protocol as the transmission medium; while the digital data network and the family A / V network use wireless as the transmission medium, using ultra-wideband UWB Technology to achieve a transmission rate of 114 Mb / s with a very low power signal to meet the bandwidth requirements of multimedia services.
Supports radio frequency access technology. Users control the high-frequency head channel selection through the built-in Web Server function of the home gateway, and capture the analog data stream in real time through the multimedia encoder. The encoding is converted into a digital media stream that conforms to digital standards (such as MPEGl). Transmission to various multimedia playback terminals to achieve high-speed information sharing of various information terminals within the home.
The home gateway can bridge the access network QoS and the home network QoS to ensure that the accessed content does not depend on the hardware and transmission mechanism used to transmit the content; the remote download function of the module flexibly supports the latest technology, making the system easy to upgrade, To support future emerging businesses.
Through the built-in Web Server function of the home gateway, remote control, adjustment and monitoring of various household electrical appliances can be achieved, and the security of user control commands and data can be ensured through SSID and VLAN technology.
The home gateway can access the company's VPN gateway through Intranet VPN to achieve Intranet and remote office.
1.2 Architecture design of digital home network system
Based on PLC power line carrier technology and UWB wireless communication technology, a digital home network system based on intelligent gateway is developed, and an embedded home gateway is used to organically combine the family data communication network, family A / V network, and family control network to Standard C and JAVA as the development platform, using RC232434 as the core CPU of the embedded system, using the embedded Linux operating system as the software development platform, using multiple SSID technology, VLAN technology and VPN technology to achieve intelligent routing, and improve QoS quality, through the home gateway The server incorporates community network signals, radio frequency digital TV signals, telephone signals, audio and video signals, and home appliance control signals into the home network at the same time to implement processing of various types of access network technologies and various types of network technologies. Digital home network system architecture system block diagram shown in Figure 1.
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