1、 Network security issues

Because wireless video surveillance engineering system may involve public privacy and social security, system security is particularly important. The wireless network takes microwave as the transmission medium, which is easy to be stolen by others, affecting the safety of the whole system and the installation of wireless monitoring.

2、 Use of operator dedicated lines

The three major domestic mobile system operators have opened up 3G wireless private networks for industrial users, including APN private network, VPDN private network and optical cable special line with special account. Most of them are in the mode of fixed IP address in the intranet. Therefore, whether they can completely isolate the connection of the Internet and avoid the influence of viruses and hackers can not be ignored.

3、 Radio signal reception problem

Most of the disconnection problems of wired network can be attributed to operators, while the wireless part is also related to the layout density of base station antenna and the size of transmission power. If the power is insufficient, it will directly affect the transmission effect. In the future, when users begin to pursue large-scale cloud monitoring, how to easily and quickly connect to the network will be the focus. That is, 3G / 4G, satellite, wired network (ADSL / FTTB) and even the current wireless Internet service are required to be used as the backbone connection for Internet access. Therefore, wireless devices with multiple backbone network link capabilities and "automatic connection and integration with the cloud" are particularly important for monitoring and installation.

4、 Bandwidth limitation in wireless mobile networks

At present, domestic wireless mobile network monitoring mainly applies CDMA, GPRS technology based on GSM and CDMA / GPRS technology based on public network. Limited by bandwidth and limited image quality, even if multi-channel bundling technology is adopted, it can only reach CIF level definition at most. CDMA / GPRS technology is not recommended for emergency command to deal with emergencies, because although it can meet the needs of actual transmission capacity, its transmission stability still needs to be improved. This is because CDMA transmission is related to its coverage. The effect in areas with poor signal coverage is very poor, and the effect in areas with good signal coverage is very good. In other words, the same set of equipment is used well, and it may not be easy to use in Guangzhou. Even if the signal coverage in a certain area is good, in case of an emergency, if the public network signal is extremely busy, under the principle of operation traffic priority, the image transmission must "stand aside". When most major emergencies occur, the base station is almost fully loaded. There are problems in using it for network image data transmission, that is, the more urgent the mobile network is, the more difficult it is to support the wireless transmission of images and the installation of wireless monitoring projects.

5、 Bandwidth congestion
Insufficient bandwidth and traffic jam cause image delay, which is also often criticized by users. In the case that the wired network has not greatly improved the network environment, many suppliers have heard such a voice. System integrators may be able to reduce these problems by purchasing specific devices and adding some smart gadgets to the AP.