At present, self-built optical fiber networks or local area networks are usually used to implement 1000M bandwidth networks in projects such as safe cities and financial network monitoring. This kind of Gigabit bandwidth resources, installed in the front-end 100 Road 1080P full-real-time high-definition network cameras (even if calculated by each channel occupying resources 4Mbps), occupying less than 50% of the total bandwidth resources; if you use 720P transmission, the bandwidth can also be reduced by half. In this way, it can fully support the practical application of high-definition network cameras.
In terms of wireless transmission, 3G networks have accelerated the speed of mobile Internet access, making applications such as videophones and mobile games in full swing. However, in the security video surveillance industry, there is no substantive application. The reasons for this are the relative lag in 3G network construction and the fact that the 3G tariff is still too high. In the face of high-definition video surveillance requirements for bandwidth, 3G is still unreliable. In order to truly achieve high-definition wireless video surveillance, we also need to wait until 4G promotion. At present, the emergence of TD-LTE has opened the door for high-definition video surveillance in the 4G era.
TD-LTE is the direction and foundation for the evolution of TD-SCDMA to IMT-Advanced (4G standard). It inherits and develops TD-SCDMA technology with independent intellectual property rights in China and has received extensive international support. According to the definition of TR25.913 of 3GPP, the peak rate of LTE is required to be high, with an uplink of 50 Mbps and a downlink of 100 Mbps. From the aspect of spectrum efficiency, the spectrum efficiency of both uplink and downlink is 3-4 times that of China’s current network. The technological development of LTE has attracted the participation of different system specifications, including UMTS (ie, 3GSM), and the participation of the CDMA2000 camp, making LTE gradually a possibility for future wireless network 4G.
At the Shanghai World Expo, the TD-LTE demonstration network constructed by China Mobile covered 5.28 square kilometers of the Expo Park. A total of 17 outdoor TD-LTE stations were built, and indoor coverage of 9 venues was achieved, including 7 venues in Pudong, Puxi. Venues. The demonstration services such as mobile high-definition conferencing, mobile high-definition video surveillance, mobile high-definition video on-demand transmission, and portable video transmission based on the TD-LTE demonstration network were all open to the public and achieved good results.
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