Mobile Handset Technology

Abstract

Wireless phones which receive their signals from towers. A cell is typically the area (several miles) around a tower in which a signal can be received. Cell phones provide array of functions. Depending on the type of mobile phone we can store contact information, keep track of appointments and set reminders, Use the built-in calculator for simple math, send or receive e-mail, get information (news, entertainment, stock quotes) from the internet, play games, watch TV, send text messages, integrate other devices such as PDAs, MP3 players and GPS receivers. A cell phone is a full-duplex device meaning that both people on the call can talk at once. Division of a city into small cells allows extensive frequency reuse across a city, so that millions of people can use cell phones simultaneously. Cell phones operate within cells, and they can switch cells as they move around. Cells give cell phones incredible range. Someone using a cell phone can drive hundreds of miles and maintain a conversation the entire time because of the cellular approach. Each cell has a base station that consists of a tower and a small building containing the radio equipment. The cell phones have evolved from Analog to Digital which has been described in the previous chapter. This chapter describes the two main standards for mobile phones i.e. GSM and WAP.