With the increasing development of wireless technology, wireless transmission technology has been applied to more and more industries, wireless monitoring has gradually been promising as a special way to use the majority of users. More industry monitoring system using wireless monitoring methods to establish a connection to be monitored and the monitoring center point between the installation because of its convenience, flexibility, cost performance characteristics. Wireless monitoring technology has been in the modern area, traffic, transportation, water conservancy, shipping, security, fire protection and other fields has been widely used.
While wireless monitoring and surveillance program compared to traditional wired with a low overall cost, short installation period, easy to maintain, flexible networking, scalability, and ease of transformation, low maintenance costs many advantages, however, the wireless monitoring is easy to be disturbed data security risks exist, insufficient bandwidth and other shortcomings, are likely to restrict the application of wireless technology in video surveillance systems. First, the transmission signal interference. Because the wireless technology is a microwave as a carrier, attached to the video data transmission on a wireless microwave, the existence of the air wave clutter can not be pre predict interference, the signal interference is very common case in practice. In order to overcome the interference of the radio signal, not only the anti-jamming efforts, but also improvement in the other areas, such as the video coding algorithm to enhance the ability of high-efficiency video compression ratio to improve the error correction capability of the video transmission is resumed, the data transmission error is provided resume algorithm. Followed by the network bandwidth issues, obviously, far less than the bandwidth of the wireless network cable network, wired network systems, video surveillance systems available bandwidth can easily reach 100Mb / s, while the wireless network system, usually bandwidth not higher than 10Mb / s. For video surveillance system is to upload large video data, while the downstream control data flow relatively small features, wireless video surveillance system to determine the number of access network cameras upstream bandwidth by calculating the size. In addition, environmental factors also affect the bandwidth normally, while cable networks affected by the environment is much smaller than the wireless network. Only when the wireless network with the strongest signal when they could achieve their standard bandwidth. If there are any obstacles or antenna slightly mobile, wireless network signal may occur significant attenuation. Finally is the security issue. Transmission wave wireless transmission open way, determines the data wireless transmission network is likely to have been intercepted, this will give a huge risk sensitive video data, if someone maliciously taken illegal interception of radio signals the way, will be able to easily decipher the contents of the wireless transmission.
At present, the main basis for 3G wireless security monitoring operators for transmission, 3G networks have limitations in achieving high-definition monitor, 4G networks can solve related problems. 4G data from the pilot test, the rate is 10 times the 3G 4G, the download speeds of up to 100M, upload speed is 20M, but the bandwidth required for high-definition 720P general surveillance substantially between each channel 2M-4M it can satisfy the demand for high-definition monitor wireless bandwidth. By 4G network, users can not only view the real-time surveillance video, you can also choose the transfer of certain time period last recording historical playback viewing, and according to need access to a variety of alarm devices, to facilitate timely view live or deal with emergencies; can remotely arm on a computer terminal, fortification, regulation network camera angles for viewing, and can achieve single / multi-screen arbitrary switching. Monitoring platform on the Internet, you can form a small monitoring command center through mobile phones and other mobile devices. Wireless network will be upgraded with the arrival of 4G era, the previous two generations or three generations of network transmission equipment will gradually lose market-based, security products to upgrade older transformation imperative, and to follow the development of communication technology upgrades, in order to meet the market demand. In addition, with the popularity of 4G wireless video surveillance applications will further expand, both in the industry and the home security market or civilian market, prospects are worth optimistic. With the rapid development of people's living standards improve and network technology, more and more people security people. Especially the development of children in recent years to improve the IT environment and the people living, prompting people to home security awareness has been an unprecedented strengthening. Thanks to the rapid development of network technology, making the remote care of children, family pets, family situation and other real-time monitoring becomes a possibility.
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