The 2013 Internet Conference was held in Beijing on August 13th. Xunlei CEO Zou Shenglong said in a speech that the popularity of smart TVs and mobile networks is still restricted. The current 3G network's tariff is 500 times that of 4M fixed-line tariffs. Can reduce the 3G network's tariff to 4M fixed network, so the development of the big Internet will have more room for imagination. Not just the Internet industry, the popularity of mobile networks also affects the development of wireless video surveillance.

Unstoppable development trend of wireless monitoring

Compared with cable monitoring systems, wireless video surveillance systems make up for a series of problems such as wiring difficulties, and have more flexible features. In many applications, the implementation cost is greatly saved; wireless video surveillance systems mainly adopt Wireless communication technologies such as 3G, 4G, and WIFI are used for networking. In combination with traditional video surveillance, a new application model has been formed. According to a survey conducted by research institutions on the video surveillance application market, wireless networks have occupied over 37% of video surveillance applications in medium-to-large-scale surveillance applications for users in industries such as safe cities, forest fire prevention, park attractions, and highway transportation. The share of the network and the rapid growth of more than three times the growth rate of cable network development. In the survey, more than half of the projects are considering the implementation of wireless networks to achieve monitoring needs, security companies have already shoved into the civilian market, a huge civilian use The market's potential demand for network monitoring can be imagined. It can be said that the wireless network has completely got rid of the supporting role in the monitoring market, and the trend of surpassing the traditional wired network at full speed has become irreversible.

Domestic mobile network construction

Wireless monitoring depends on the development of network technology. However, the current domestic and even global network construction is still not optimistic. Recently, Beijing Youth Daily released an article entitled “Speed ​​measurement in China and the United States: The fastest mobile network speed in mainland China in Hong Kong”, which tested the speeds of Beijing, Hong Kong, New York, and San Francisco in five different regions. . During the test, six testers used the local fixed network and mobile phone mobile network to experience the network download speed. The data obtained from the test was: the average speed of China's mainland network was 1.15M, Hong Kong was 10.5M, and Asia-Pacific or global average speed was 4.64. M; China ranks 80th in the world. Another survey pointed out that “The average monthly Internet access fee for users in the Chinese mainland is 4 times that of the United States, 20 times that of South Korea, and a hundred times that of Hong Kong. One of them ridicules China’s network construction,” but it is less than half the speed of others. Including the following factors: operator access network, metropolitan area network, backbone network, interconnection, international exports, etc., as well as the status of the user's computer and the server on which the content is accessed. What is the domestic network construction situation in the end? How much broadband can realize wireless surveillance HD video transmission under the market background of the trend of high-definition?

Wireless monitoring development bottleneck

Although 3G networks have already been covered in some urban hotspots, the number of 3G base stations is not enough, resulting in unstable networks in certain regions; there is no 3G network coverage in second-tier and third-tier cities, economically underdeveloped regions, and rural areas. To some extent, it has become a limiting factor in the development of the wireless mobile monitoring market. The high cost and low transmission rate of network construction has become a recognized problem. Mr. Xiang Liangbi, an industry consultant of HC Security Network, once published an article titled “When Will HD Video Surveillance Be Popular in China?”, referring to domestic Current status of 3G networks and wireless video transmission: Although the bandwidth of 3G is much higher than that of 2G and 2.5G, the bandwidth of 3G is responsible for the uplink and downlink transmission tasks, and one base station may have multiple users at the same time. Work, the speed of the terminal will also affect the transmission speed (in the indoor, outdoor and driving environment, 3G can support about 2M/s, 384K/s and 144K/s respectively), resulting in uncertain bandwidth in wireless transmission. Sex. General network video surveillance requirements to achieve the appropriate resolution, different resolutions need to provide different bandwidth, the current video compression technology can reach the following indicators:

Video compression technology indicators

It can be seen that even if the current 3G network transmits CIF images, one base station cannot exceed three monitoring points. The 3G operator's customer priority is transmitted in the order of the voice customer, the priority customer, and the ordinary data customer, and the transmission of the ordinary mobile monitoring user is also unstable. Therefore, the transmission of 4CIF format monitoring video requires at least 2M of bandwidth (broadband (2048kbps=2Mbps), if the transmission of high-definition video transmission bandwidth at least to meet more than 6M. The current 3G network speed can only be used as an auxiliary monitoring means of transmission.

In addition to the current impediment to network speed, mobile monitoring system operating costs also allow users to stay away, mobile monitoring costs include video source broadband Internet access fees, mobile phone viewing traffic charges, monitoring system operating costs, etc., if the standard transmission to calculate a certain rate One-hour video file size for a channel is calculated as follows:

File size = code stream (kbit/s) ÷ 8 × 3600 ÷ 1024 (unit: MB); 4CIF (704 * 576): 768K 2 2Mbp, that is, network monitoring through 3G transmission, one hour consumes 1-2M of traffic, With China Mobile's out-of-traffic cost of 0.01 yuan/kb, it will cost anywhere from 10.24 to 20.48 yuan. It can be imagined that the long-term accumulation of costs will be as high as 3G network costs are an important factor hindering the development of wireless surveillance. Just as the Thunder CEO Zou Shenglong at the 2013 Internet Conference stated at the time of his speech, the current “3G network tariff is 500 times the 4M fixed network tariff”. Due to the limited 3G bandwidth and higher tariffs, WiFi transmission distance is limited and mobility is poor, and high-definition network transmission is "insufficient." In the 3G network environment, high-definition wireless monitoring cannot be promoted at all. Even China Mobile's 4G network test data shows that the average downlink downlink speed reaches 40Mbps, and the average uplink speed is 18Mbps. Due to the same reasons as mentioned above for 3G systems, it is still very difficult to promote HD. Then the 4G network's charging standards and speed have become people's biggest expectations.

to sum up

Today's domestic wireless network construction will have a revolutionary impact on high-definition wireless surveillance as long as it can handle the challenges of wireless surveillance in terms of bandwidth, stability, and traffic costs. The maturity of network technologies will make wireless surveillance even more powerful!