2009年是中国3G元年,3G牌照发放后,三大运营商大力推进3G网络建设。3G网络具有带宽高、覆盖广、安全性突出等技术特点,突破了视频监控信号长距离数字化传输的瓶颈,摆脱了复杂环境和网络条件对传统监控的束缚,开辟了无线视频监控的新时代。 2009 is the first year of 3G in China. After the issuance of 3G licenses, the three major operators vigorously promoted the construction of 3G networks. 3G network has many advantages such as high bandwidth, wide coverage and outstanding security. It breaks through the bottleneck of long-distance digital transmission of video surveillance signals and frees itself from the traditional monitoring and control of complicated environment and network conditions and opens up a new era of wireless video surveillance.