Mobile phone channels can also serve security analysis GPRS monitoring applications

Introduction to GPRS

Speaking of GPRS, I'm afraid everyone will naturally associate it with mobile phones. Yes, in this era of mobile phones and wireless networks playing more and more roles, GPRS has already penetrated into everyone's hearts overnight. But if we talk about the application of GPRS in security monitoring, I'm afraid everyone will feel very unfamiliar. Perhaps many friends will ask: GPRS can also be used for video monitoring transmission, can its bandwidth really meet the requirements? Now let's take this question and carefully talk about the role of GPRS in security monitoring.

As a wireless communication technology, GPRS is an intermediate technology for the transition from the second generation mobile communication (GSM) to the third generation mobile communication (3G). This technology was first proposed by a British company in 1993. Since GSM technology can only transmit services at a rate of 9.6kbps, it is obviously difficult to meet the most basic needs of everyone in today's advanced wireless Internet. Therefore, GPRS technology, which can provide up to 115kpbs, was born.

In terms of usage, the reason why GPRS can quietly benefit the world overnight is mainly based on its "closeness" with GSM technology. Since GPRS uses the same frequency band, bandwidth, burst structure and frequency modulation rules as GSM, GPRS can rely on the original GSM network to complete all its work without basically resetting. This also allows GPRS wireless transmission technology to complete the transmission of various signals in any place where there is a mobile phone signal. Therefore, this also allows users to have a shallow taste of wireless monitoring before the advent of the 3G era.

When it comes to the advantages of GPRS, it can basically be reflected in the following aspects:

Real-time monitoring can be achieved through mobile terminals

As mentioned above, GPRS can provide a transmission rate of up to 115kbps. Therefore, it can realize the simple transmission of some pictures and audio and video. This is undoubtedly much more advanced than GSM technology which can only transmit audio. In addition, its always-online, voice and data compatibility, and fast transmission characteristics also give it a strong real-time video transmission function. Therefore, this can also meet the needs of the monitoring command center to obtain monitoring signals at any time and conduct rapid command and deployment.

GPRS working diagram (picture from the Internet)

Short access time

In addition to the convenience and strong transmission capacity mentioned above, fast access time is also one of the main features of GPRS. Perhaps those who have used GPRS to surf the Internet may feel that the time from GPRS access to page opening is basically negligible under the condition of good network signal, which also reflects the fast access time of GPRS network. Data shows that GPRS packet switching can basically complete all work within 1 second, so this also provides the possibility of using GPRS technology to complete more critical real-time command tasks.

Wide transmission coverage and strong resource integration capabilities

The wide transmission coverage mentioned here can be specifically divided into two aspects: the network format served, and the population served. Here we first talk about the network format. Since GPRS can support our most widely used network protocol and X.25 network protocol, it ensures that the monitoring equipment can communicate with any network information, so that the network protocol served can be maximized. In addition, as mentioned earlier, since the application equipment of GPRS and GSM is basically the same, GPRS service can be provided wherever there is a mobile phone signal, so this is also the maximum coverage of GPRS signals to various regions.

For GPRS, since its signal belongs to co-line transmission, the transmission channel will only have signals when the user sends or receives information, and will not occupy resources at other times. This also reduces the pressure on the transmission line and improves the utilization rate of resources while achieving sharing.

Where GPRS lags behind

Of course, as a network transmission technology developed based on mobile communication services, its audio and video transmission is destined to be just an auxiliary function. Therefore, in actual applications, GPRS transmission still has many disadvantages that hinder the smooth application of network monitoring applications.

The first problem is the stability of the system. For wireless network transmission, whether it is GSM or 3G network, stability has always been one of the aspects that makes people worry. As a wireless network transmission technology that is slightly lower than 3G technology, the instability of signal transmission is certain.

Embedded GPRS chip (picture from the Internet)

Secondly, since GPRS signals can transmit audio and video, but voice calls and GPRS cannot be carried out at the same time, when one of them is working, the other must be completely cut off, which can easily cause a large number of network signal losses. This is undoubtedly a huge threat to the integrity and effectiveness of the video surveillance system.

In addition, although the theoretical value of GPRS transmission can reach more than 150kbps, this requires smoother lines and more advanced transmission links as a guarantee. Without special support, the actual value may only reach about one-third at most. This undoubtedly reduces the few advantages of GPRS.

Therefore, for video surveillance, GPRS is obviously not capable of taking on more surveillance tasks. It is destined to be a communication technology that focuses more on mobile communication services. Of course, GPRS is not useless for video surveillance. For simple home surveillance with low picture quality and low continuity requirements, GPRS is undoubtedly a more affordable and simple choice. Moreover, after you are familiar with the technical characteristics of GPRS, you may discover its greater value in the corners of your home.