As China’s mobile communications formally enters the 3G era, the combination of 3G wireless communication technology and video surveillance platforms has quickly become a hot spot in the security industry. Users, integrators, and manufacturers have developed strong interest in this new application and have driven it. With the booming development of this emerging market segment in 3G wireless video surveillance, many security companies have invested a lot of manpower and material resources in the research and development of related technologies and products, expecting high market returns, but in reality the 3G wireless video surveillance platform What is the direction and outlook of the application?

Application Status and Features of 3G Wireless Video Surveillance Platform In fact, the combination of wireless communication technology and security system is not a product of the 3G era. Due to the convenience of deployment and use brought about by wireless communication technology, it appeared as early as the first generation of mobile communication. The integration of the security alarm platform and wireless mobile communication devices. When the mobile communication network is upgraded to 2.5 generations, the data transmission performance of GPRS and CDMA1X has been greatly improved, and the theoretical maximum data transmission rate has reached more than 150 Kbps, which lays the foundation for the combination of video surveillance platform and wireless mobile communication. The material basis, but because the actual usable bandwidth is far lower than the theoretical value, at the same time there are factors of cost and stability, practicality is not high. The video surveillance platform developed on the basis of 2.5-generation mobile communication technology can only transmit video images with a QCIF resolution of 20 frames or a CIF resolution of about 5 frames. Such a quality image can only recognize the trajectory of others and is used in some specific ways. The field and location, and the subsequent effect of multiple wireless channel bonding technologies are still far from satisfactory, which is far below people's expectations. Therefore, it can be said that the 2.5G wireless video surveillance platform is a combination of a video monitoring platform and a public wireless communication network. An attempt.

The urgent demand for high-speed data mobile transmission (including video mobile transmission) has pushed the rapid arrival of the 3G era. With the official issuance of the 3G operating license in January 2009, people’s endless desire for wireless video surveillance platforms has ignited. In the following two years, 3G video surveillance products emerged in an endless stream. During this period, Beijing China Wisdom Telecommunications Technology Co., Ltd., as a professional video surveillance platform developer, also participated in some 3G projects. Through these projects, it revealed to everyone the 3G wireless video surveillance platform. The status quo.

First of all, from the perspective of composition, 3G wireless video surveillance platform is no different from ordinary video surveillance systems. It is composed of front-end acquisition and coding equipment, centralized management platform and monitoring client. The convergence of 3G wireless mobile communication technology in the video surveillance platform is mainly reflected in two parts. One is the transmission network between the front-end acquisition coding equipment and the monitoring center platform. This requires front-end acquisition and coding equipment to support 3G wireless routers, and products of different manufacturers. The difference is still relatively large. Usually, such devices support both single-network (WCDMA and EVDO) and multi-network support; 3G routers, video encoders, and power supplies with high integration are fully integrated and have low integration. The ordinary 3G routers and video encoders are directly connected through the network cable, but this is the basic requirement for the 3G wireless video surveillance platform construction project. For users, they should choose higher integration, support multiple networks, and have more stability. A good front-end acquisition and coding device; the second is the transmission network between the monitoring center platform and the 3G mobile phone client. This requires the platform to support the mobile phone monitoring control. This requirement is relatively easy to implement under the 3G network conditions, which is icing on the cake. Features, usually browse through wired networks and PCs.

Secondly, from a technical point of view, in order to implement mobile 3G wireless video surveillance, most of the key and core technologies are embodied in front-end acquisition and coding equipment, front-end equipment integration, power supply, seismic and storage technologies, and front-end equipment to monitoring. The center's data error correction technology is the core of the 3G wireless video surveillance platform. Usually the front-end acquisition and coding equipment is used in mobile, on-vehicle, emergency or inconvenient installation locations, which requires a good integration of 3G routers, power supplies and video encoders, and the limited bandwidth of 3G channels, such as The need for storage must also be integrated in the equipment, and the vehicle must also consider the overall seismic performance. In addition, because the 3G channel still has problems such as instability, packet loss, delay, and NAT, it also needs to support data correction from the front-end device to the monitoring center, and the front-end device supports active call centers and on-demand wake-up dialing capabilities.

Finally, in terms of application characteristics, the 3G wireless video surveillance platform, due to its inherent mobility, flexibility, and ease of deployment, fills the constraints of traditional video surveillance system deployment, heavy engineering, long duration, and lack of flexibility. The problem of being unable to move, as an organic complement to existing video surveillance systems, is often used in mobile individual, vehicle-mounted, emergency command and zero-hour deployment deployments, but it still cannot replace the traditional video surveillance system.

The problems existing in the 3G wireless video surveillance platform have experienced a long period of impulsiveness as in the case of each new technology after more than two years after the appearance of the 3G wireless video surveillance platform. In this period, the advantages of 3G and The features are over-exaggerated, but the deployment results are far from satisfactory. It also caused the 3G wireless video surveillance platform to heat up. What are the problems with the practicality and deployment of 3G wireless video surveillance platforms?

The user's expectation is too high Due to the improper promotion of 3G operators and some 3G wireless video surveillance platform vendors, the user's use of the 3G wireless video surveillance platform is expected to be too high. The actual project test often encounters some users that 3G wireless video surveillance can achieve the effect of wired video surveillance. It can provide 25 frames of video images with D1 resolution. Obviously this is not realistic. In order to meet the expectations of the users, some manufacturers will find some places where the 3G signals are better in the subsequent actual tests. This results in less effective results than the test results, and the test results are not as good as users expect.

The 3G network bandwidth is still limited. According to the deployment of the three 3G standards in use in China, the theoretical rate of WCDMA uplink rate is 5.76Mbps, the downlink rate is 14.4Mbps, and the theoretical uplink rate of mobile TD-SCDMA is 384Kbps. The theoretical value of downlink rate is 2.8Mbps, the theoretical value of uplink rate of telecommunication CDMA2000 is 1.8Mbps, and the theoretical value of downlink rate is 3.1Mbps. The actual use effect is much lower than the theoretical bandwidth. Considering that the above values ​​are the throughput capacity of a base station, if a base station covers 5 kilometers, all users share the bandwidth, and the bandwidth available for 3G monitoring is very limited. CIF resolution Rate image quality is also difficult to guarantee.

Coverage is still limited The coverage of 3G networks is still far below that of 2G networks. Due to the mobile nature of 3G video surveillance, it is often encountered in some areas where the coverage of Netcom signals is better, and in some areas, the signals covered by telecommunications are better. In some places, Telecom and Netcom have no signal, and the places that need to use 3G video surveillance simply cannot return the available video images.

The tariff is still higher Due to the limited resources of the existing 3G communication network and the large user demand, the operators have adopted the method of charging by traffic, and the cheapest is also 150 yuan/3G, which exceeds the charge of 0.03 yuan/KB. Standards, for video surveillance, in order to ensure basic image effects, each CIF resolution image must reach a bandwidth of at least 384K. In real applications, it often occurs that the cost of a full-blown card cannot be viewed, the high cost and explosion. The inconvenience caused by the card also severely restricted the use and popularity of 3G wireless video surveillance.

Unpredictable image effects As 3G communication networks cannot provide stable bandwidth resources like wired networks, taking into account the many scenarios of the use of 3G wireless video surveillance platforms for emergency event monitoring and processing, the more the same in this case Under the base station, the greater the user's traffic and the smaller the coverage, the image quality of the 3G wireless video surveillance platform is totally unpredictable. This is also an important factor that restricts the popularity of the 3G wireless video surveillance platform.

Prospects of 3G Wireless Video Surveillance Platform In general, users do have strong demands for mobile individual, on-board, emergency command, and zero-hour deployment, and 3G wireless video surveillance has brought people to realize this as a new thing. The possibility of demand has led to a very good development in the past two years. However, due to the many problems still existing in the 3G wireless communication network, these problems still cannot be satisfactorily resolved in the long term, which also caused At this stage, 3G wireless video surveillance still can only be deployed in a small area of ​​a specific venue, as a reasonable complement to wired video surveillance systems. For some special applications, such as forest fire prevention, it is recommended to adopt a self-built WiFi base station in a more reasonable manner, and a relatively good stability and image quality can also be obtained. In addition, China Mobile has been actively developing its own 4G wireless communication network since 2010, and the official operation of the 4G wireless communication network will also be put on the agenda. Is 4G able to solve the problems existing in 3G wireless video surveillance applications? We will wait and see! (Author: Beijing Hua Wei Telecom Technology Co., Ltd.)