GSM occupied band

The frequency bands occupied by China's GSM mobile phones are mainly 900 MHz and 1800 MHz. In essence, 1800 MHZ was also caused by the surge in the number of mobile phone users, which caused the mobile communication network system to be in a state of overloaded operation. As a result, the mobile phone is prone to similar failures such as dropped calls, crosstalk, poor voice quality, and difficulty in accessing the Internet. phenomenon. In order to solve these problems, more and more mobile phone operators and manufacturers are beginning to realize the urgency to solve this problem, and continue to take relevant measures to further expand the mobile phone network system, so GSM1800Mhz came into being, was also called For the DCS1800 (digital cellular system), its emergence, making dual-band networks based on GSM900, 1800 into reality.

With the GSM900/GSM1800 dual-band mobile phone, users can freely switch between GSM900 and GSM1800, which can effectively avoid the problems of dropped calls, difficult calls and poor sound quality. This is more convenient than the previous call using only the GSM900 network.

Here we simply compare the two bands of GSM900 and GSM1800:

In order to further expand the operating capacity of the mobile phone network system and improve the voice quality during mobile communication, a "tri-band mobile phone" has recently been introduced in the market.

The so-called "triple frequency" contains three operating frequencies. The three operating frequencies are GSM900Mhz, DCS1800Mhz, and PCS1900Mhz, and so on. The so-called "tri-band mobile phone" means that the mobile phone can receive three GSM900M, DCS1800Mhz, and PCS1900Mhz at the same time. The signal of the frequency segment is chosen from it. The signal strength of that frequency band is to select the signal of that base station. If one of the signals of the base station fails, it can be freely transferred to the signal of another frequency band. It actually expands the mobile phone's connection rate. In areas where mobile phone users are more concentrated, tri-band mobile phones are particularly suitable because tri-band mobile phones can flexibly switch between GSM 900, DCS 1800, and PCS 1900 so as to maintain constant conversation and call quality at all times. PCS1900 network is a commonly used network segment in the communications network in North America (United States, Canada) and European countries.

Because tri-band mobile phones can work in three different frequency segments at the same time, tri-band mobile phones undoubtedly have the characteristics of these three networks. From a technical point of view, because of its high frequency band, the GSM1800 has strong signal penetration capabilities, and therefore can provide good call quality and communication coverage in the complex environment of high-rise buildings; and the PCS1900 channel is in North America (the United States, Canada) and The European region has good communication capabilities, which undoubtedly provides those who frequently travel to and from intercontinental services they need.

For operators, the construction of a three-band network will completely alleviate the problems of the frequency bands and capacity of the GSM900, which will further optimize the network, effectively reduce the peak traffic volume in hotspots, and increase the connection rate. Make the business volume greatly improved.

For users, the emergence of tri-band mobile phones will be the most far-reaching, and will be the most practical, because the use of tri-band mobile phones, through tri-band network roaming, dropped calls will be greatly reduced, the application of mobile phones Will be more liberal. Tri-band mobile phones allow users to freely communicate in 120 countries on five continents.