Nokia cellular phones
Motorola cellular phones
cellular phone accessories
Check AT&T Wireless service avalibility in your area.
I would like to tell you about my profession as a cellular planner, which has become my favorite thing to do. It's the thing that made me become a researcher, and I enjoy finding new solutions and tools in my work. It wasn't just the money that got me into this profession.
Have you ever wondered why mobile networks are called cellular? Why do we need hundreds, thousands of base stations with antennas on towers, poles and roofs? Why can't you install antennas with radio transmitters on a very high tower, such as the Ostankino tower, and provide communications for all of Moscow?
The answer is yes, and not just Moscow, but the whole world. Our compatriot, the famous polar explorer Ernest Krenkel, first did it in 1930 when he set the record for radio communication range. While in the Arctic, he communicated with the American Antarctic expedition. The total length of the radio channel was 20 thousand kilometers. This record has not been beaten up to this day.
By the way, modern communication equipment is many times more effective than Krenkel's radio, but the service zone of modern BS can not exceed 100 meters.
It is all about the amount of information transmitted and the number of users of communication services. If in 1930 there were a few hundred amateur radio operators all over the world, and all communication was in Morse code (point-tyre), now only mobile communication on Earth is used by over 4 billion people, and the daily volume of information transmitted via mobile Internet is more than one Exabyte (1018 bytes).
Imagine the radio channel through which information is transmitted from a smartphone to the nearest base station, in the form of a pipe. Its thickness, i.e. bandwidth, depends on the number of frequencies allocated to the radio channel. The more there are, the wider the "pipe" and the more information is transmitted. For example, if we want to serve all mobile Internet users on Earth in one radio channel, we need a bandwidth of 2.2x1014 bits/sec. All of the frequency resource used for ultra-long-range radio in 1930 would not provide even 0.0001% of the bandwidth required.
The frequency resource is allocated by the state, and it has long been divided among various interested organizations - from radio and television to special services. Mobile operators are also allocated frequencies, but they are few in number. One radio channel organized on all the frequency resource allocated to operators will not be able to serve even 0.1% of subscribers.
Sign up to receive our free phone newsletter and be notified of new phone specials, bargains and products.
send this site to a friend