Explain cellular telephone systems, Electrical Engineering

Assignment Help:

Q. Explain Cellular Telephone Systems?

Today radio-based systems make it possible for mobile people to communicate via cellular telephone systems while traveling on airplanes and motor vehicles. For radio telephone service, the FCC in the United States has assigned parts of the UHF band in the range of 806-890 MHz. For efficient use of the available frequency spectrum, especially in highly populated metropolitan areas with the greatest demand for mobile telephone services, the cellular radio concept has been adopted, inwhich a geographic area is subdivided into cells, each ofwhich contains a base station, as shown in Figure. Each base station is connected by telephone lines to amobile telephone switching office (MTSO),which in turn is connected through telephone lines to a telephone central office of the terrestrial telephone network.

2014_Explain Cellular Telephone Systems.png

When amobile user (identified by the telephone number and telephone serial number assigned by themanufacturer) communicates via radio with the base station within the cell, the base station routes the call through the MTSO to another base station if the called party is located in another cell, or to the central office if the called party is not mobile. Once the desired telephone number is keyed and the "send" button is pressed, theMTSOchecks the authentication of themobile user and assigns (via a supervisory control channel) an available frequency channel for radio transmission of the voice signal from the mobile telephone to the base station. A second frequency is assigned for radio transmission fromthe base station to themobile user. Simultaneous transmission between two parties is known as full-duplex operation. In order to complete the connection to the called party, the MTSO interfaces with the central office of the telephone network by means of wide-band trunk lines, which carry speech signals from many users. When the two parties hang up upon completion of the telephone call, the radio channel then becomes available for another user.


Related Discussions:- Explain cellular telephone systems

Find magnitude and direction developed torque, Q. The self and mutual induc...

Q. The self and mutual inductances of a machine with two windings are given by L 11 = (1 +sin θ), L 22 = 2(1 + sin θ), and L 12 = L 21 = M = (1-sin θ). Assuming θ = 45°, and le

Complete the timing diagram of an sr latch, Complete the timing diagram of ...

Complete the timing diagram of Figure of an SR latch.

Calculate the actual frequency of circuit, (a) The circuit of Figure 1 repr...

(a) The circuit of Figure 1 represents an amplifier-speaker connection. The filter is a low pass filter which is connected to the woofer. The filter is a -network. (i) Design a

Capacitor.., #Explain charging and discharging of the capacitor ..

#Explain charging and discharging of the capacitor ..

Explain topology method used in lan technology, Q. Explain topology method ...

Q. Explain topology method used in LAN technology? Ans: LAN Topologies: Network topology is a physical schematic which demonstrates interconnection of the many users. Th

Water flow mangemen using embeded technogy, what is the method to do this p...

what is the method to do this project and what material used for?

Determine the armature current and power factor of the motor, A three-phase...

A three-phase, wye-connected, 2300-V, 60-Hz, round-rotor synchronous motor has a syn- chronous reactance of 2 per phase and negligible armature resistance. (a) If the motor tak

Multiplexer, design a 32:1 multiplexer using two 16:1 multiplexer

design a 32:1 multiplexer using two 16:1 multiplexer

Electromagnetic torque , Electromagnetic torque  The torque is given...

Electromagnetic torque  The torque is given by the force on the armature winding multiplied by its radius. Force on a conductor in magnetic field B is:  F=B.I.L so, T=B

Home energy management.., I need help to build a circuit diagram for home e...

I need help to build a circuit diagram for home energy management.It includes load controllers,a central system in which we should programme all of the control commands,and a two w

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd