subject: Analysis Of High-speed Mobile Wireless Video Surveillance Solutions - Mobile Video, Monitor Security [print this page] With the wireless city network construction, and wireless network technology issues related to various applications are gradually becoming apparent. In addition to signal interference, frequency reuse issues, this article will tell the mobile video surveillance explain some of the problems faced and solutions.
Wireless cities in China showed strong momentum, in addition to Taipei, Hong Kong large-scale deployment, the Chinese mainland in Beijing, Shanghai, Guangzhou, Wuhan and Shenzhen, have been or are ready to begin building a wireless city. Mainland China currently used by major wireless city construction system for the wireless technology Wimax + Mesh-wifi, Wimax in the wireless backbone network which is used in various regions of the flow convergence, and the wired network connection; Mesh-wifi is in wireless access layer, complete end-to-network access, as well as short-range wireless data jumper. Use Mesh-wifi as wireless access layer has the advantage of:
1.Wifi technologies mature industry chain, each link a wide variety of products, competitive full product price.
2.Wifi rapid technological development, improvement of various aspects of technology continue to emerge and develop, and future evolution of the road clear.
3.Wifi large number of terminals, mobile phones, laptops and other electronic products in the built-in Wifi capabilities, potential customers a huge market are enticing.
4.Meshwifi technology can effectively solve the urban construction floor wireless network problems encountered, greatly reduce the engineering difficulties, save construction costs, shorten the construction period.
While the above benefits, but there are some Meshwifi network problems, in addition to the interference problem has been introduced and the different frequency switching, the mobile video service features as one of business, how to achieve the more perfect is the need to consider of.
In the industry in high-speed mobile (car) to stimulate demand for video surveillance, if the police department's mobile patrol, fire department emergency mobile video, multi-government emergency response and other demand, regional Wifi-Mesh network high-speed mobile video to create the conditions under.
However, the technical realization of the MESH manufacturers are different, the system can achieve performance varies widely. Performance seen in the following two aspects: 1) speed, that is how high the velocity is still able to ensure high-quality connection. 2) the video quality, mainly in real-time video and real-time for the system demands a very high error rate.
Public information from the industry point of view, most of the MESH manufacturers to achieve real-time video under low-speed mobile services, but for more than 70 km / h case, can be achieved relatively little. As high-speed mobile, the car terminal of the switch will be very frequent updates on the routing requirements are very high, while the wireless environment will affect the stability of the bandwidth.
Now publicly declared support of the domestic high-speed mobile video service under the manufacturers only GBCOM company. As the Meshwifi the only professional equipment manufacturers, Shanghai Huan Chong Communications (GBCOM) puts forward some solutions, Shang Tao, vice president of technology stated: "solve the problem of fast-moving video, the use of seamless soft for technology, Quick dynamic routing technology and dynamic channel adjustment adjustment technique, based on video services must also be optimized to use technology. "It is understood, GBCOM product will be IP packet priority classification, combined with the MAC priority, to ensure video service quality from the bottom ; other class of business can also established multi-path video, according to the underlying wireless link quality detection information, to share the video business to the appropriate multiple path transmission. This guarantees the quality of a single path will not affect short-term decline in the overall quality of the video. Theoretically, the development of products currently GBCOM to over 300 km / hour application, now has been actually proven system over 200 km / hour.
