Working Of Mobile Phones

Mobile phones are so called because they cover compartmentalized, cell like areas. Original mobile phone can be traced back to 1973 when Motorola came up with the World `s first handheld cell phone, which Motorola DynaTAC 8000X was sold.

These days, new phones quickly added. Parts are usually the following: board, antenna, keyboard, screen LCD - Liquid Crystal Display, battery, microphone, speaker.

In recent times, are available with a wide array of features. To name a range of functions, depending on the type of phone you choose, keep contacts, appointments, tracking, reminders, preparation of lists, send / email to receive, play games, text messaging (SMS), access the Internet, watching and enjoy TV, built-in integration with other computer devices, such as GPS, MP3 players, etc.

Mobile phones operate on radio frequencies, they have come up with an innovative approach to deal with the limited availability of mobile spectrum. Now, more mobile towers used to meet a wide geographical area.

Each tower (base station) covers a circular area called a cell. A large field is divided into a variety of mobile base stations use the same channel / frequency of communication. This allows thousands of mobile phone users to share much less channels.

Another important aspect is that the cell needs less power for transmission to reach a base station for each base station covers a smaller area. Reduce the transmission power required reduces battery capacity and thus the weight phone. This led to the miniaturization of mobile phones would not be possible without the technology of the cells.

When using the mobile phone, then things happen. The first piece of phone base station with the strongest signal, and requests for a missing channel. Base is the mission of the channel and the call is accepted. The call is then sent to the local telephone network, or a regular phone otherwise transmit via the mobile network. The call is then sent to the destination telephone via the network.

When the phone is switched on, the SID (System Identification Code) on the control channel compares the SID programmed into your phone. When the match SID, means that the mobile communications system at home. The phone sends a request to register with the SID and the MTSO monitors the phone `s location in a database. If the SID on the control channel does not match the SID of the phone, then the phone is roaming.

Three technologies commonly used by 2G cellular networks to provide information: frequency division multiple access (FDMA), time Division Multiple Access (TDMA), code division multiple access (CDMA).

GSM (Global System for Mobile Communications), TDMA is, connect to specific service providers in different countries. Using GSM Subscriber Identification Module (SIM). card contains all the data link / ID numbers needed to access a particular wireless service.

Standard protocols are used widely 2.5G GPRS, EDGE, to name a few. Some of the latest 3G protocols are: Universal Mobile Telecommunications Service (UMTS) Wideband Code Division Multiple Access (WCDMA), High-Speed Downlink Packet Access (HSDPA) Data maximum development (EVDO).

Several popular models of mobile telephony market offered by Nokia, Ericsson, Motorola, Samsung, LG, etc., each with its own range of model years 2008 collections.The a high watermark in the history of the mobile phone Nokia N Gage 2, HTC Dream, the Apple iPhone 2, BlackBerry touch screen, Sony PlayStation phone is expected to start.