The video surveillance system has developed for just over 20 years, from analog surveillance to fiery digital surveillance to burgeoning network video surveillance, and has undergone tremendous changes. As IP technology gradually unifies the world today, we need to re-understand the history of video surveillance systems. From a technical point of view, the development of video surveillance systems is divided into the first generation of analog video surveillance systems (CCTV), to the second generation of "PC + multimedia card" digital video surveillance systems (DVR), to the third generation of video surveillance based entirely on IP networks System (IPVS).
With the continuous development of technology, wireless video surveillance systems will be one of the most widely used wireless network technologies. At the same time, with the construction of wireless cities, wireless video surveillance will also be one of its killer applications.
Wireless video services have high requirements for bit error rate, handover efficiency, delay, and bandwidth stability. If these aspects are not handled properly, video images will show mosaics, jumps, pauses, and so on. As we all know, the WLAN technology is not originally designed according to the requirements of the large-scale telecommunication system of the telecommunication system. There is no provision for switching across APs in the basic version, and the switching efficiency between general terminals in the AP is very low; in addition, for the AP and the terminal for video services Without special processing, these factors, like normal PS domain data, can lead to the inability to carry out real-time services such as video surveillance and voice.
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