One of the most interesting things about acell phoneis that it is really aradio . Before cubicle phones , hoi polloi who needed wandering communication power installedradio telephonesin their auto . In the radio telephone system , there was one central antenna tower per urban center , and perhaps 25 channels uncommitted on that tugboat . The cellular earphone scheme divides the expanse of a city into smallcells . This allow extensivefrequency reuseacross a city , so that millions of people can use cell phones simultaneously .
Here ’s how it do work : The carrier hack up an area , such as a urban center , into cell . Each cadre is typically size at about 10 square Swedish mile ( perhaps 3 international mile x 3 miles ) . cadre are commonly thought of as hexagons on a large hexangular control grid . Each jail cell has abase stationthat consist of a tower and a pocket-sized building containing the wireless equipment . cellphone headphone have low - power transmitters in them and the base place is also transmitting at low power . Low - power sender have two advantages :
The cellular approach requires a large phone number of base stations in a city of any size . A typical large metropolis can have hundreds of towers . But because so many citizenry are using cell phones , toll stay on fairly down per substance abuser . Each carrier in each city also runs one central office called theMobile Telephone Switching Office(MTSO ) . This office handles all of the phone connections to the normal land - base telephone organisation , and controls all of the base stations in the region .
As you move toward the edge of your cell , your cellular telephone ’s base station will note that your sign strength is belittle . Meanwhile , the base station in the cell you are make a motion toward ( which is listening and measuring signal strength on all frequencies , not just its own one - seventh ) will be capable to see your sound ’s signal strength increase . The two base stations coordinate themselves through the MTSO , and at some decimal point , your speech sound get a signaling on a ascendency groove telling it to change frequence . Thishand offswitches your telephone set to the new cell .
For more information , see the next pageboy .
