Mobile communication range. According to using requirements and work in different contexts can be divided into the following.
Trunking mobile communication
Trunked mobile communication, also known as the regional system of mobile communication. It is characterized by only one base station antenna height, several tens of meters to hundreds of meters, covering a radius of 30 km, the transmitter power is high up to 200 watts. htc flyer The number of users is about tens to hundreds of, can be a vehicle units, but also to the hand-held station. They can communicate with the base station, also available via the base station and the other mobile station and local user communication, base station and city station wired network connection.
Cellular mobile communication
Cellular mobile communications, also known as the microcell mobile communications. It is characterized by the large range of service area is divided into many areas, each area is provided with a base station, in charge of the area of each mobile station contact and control, each base station by the mobile switching center contact with each other, and with a central office connection. With ultrashort wave propagation distance limited features, leaving some distance from the village can be repeatedly used frequency, the frequency can make full use of the resources. Each community of users in more than 1000 of all the coverage area, ultimate capacity of up to 1000000 users.
Mobile satellite communication
Mobile satellite communication. The use of satellite transponder signal can also be mobile communication, mobile communication can be used for the fixed satellite, and on the handheld terminal, using a low orbit satellite constellation is advantageous to the.
Cordless telephone
Cordless telephone. For indoor and outdoor slow moving handheld terminal communication, with small power, communication distance near, portable cordless telephone.HTC flyer p512 They can pass the communication with local users to check or to the two sides of communication.
Using the analog identification signals of mobile communication, called the analog mobile communication. In order to solve capacity increase, and improve communication quality and increase the service function, most of the current use of digital identification signal, digital mobile communication. In the system, time division multiple access ( TDMA ) and code division multiple access ( CDMA ) two.
The former in the world with a European system of GSM ( Global System for mobile communications), North America dual-mode standard IS 54 and Japan's JDC standard. For code division multiple access, with American Qualcomnn company developed IS-95 standard system.toshiba tablet The general trend of digital mobile communication will replace analog mobile communication. While the mobile communication to personal communication development. In twenty-first Century has become an important part of global information highway. Mobile communication will have a more brilliant future.
