Cellular Networks

Cellular Network

Yours Name

Professor’s Name

University

Component of Cellular Network

Described cellular network will use GSM technology and its architecture and for Security purpose Public key algorithm similar to GSM specific will be configured.

Technology used in Network –

Towers/Antenna - Cellular Radio Tower with antenna known as BTS to service each cell. Total 4 towers will be required. It should be able to tune to provide various types of radio signals.

Switches - For Mobile Switching Center one switch will be required. It should be able to provide both packet switching and circuit switching functionality

Mobile Handsets - Two digital handsets are required. Devices should be able to support the GSM technology.

SIM - Two subscriber Identity module is required which will contain the MSISDN and network authenticate algorithms.

Controller - 2 Controller are required to handle the BTS and to transfer information to the MSC. These controllers will work as BSC.

Power Supply - For Cellular tower, Controller and MSC continuous power supply is required.

Database/Registers - Three Databases are require which will keep the information for registered subscriber or MSISDN. VLR, HLR and EIR will be used to store the subscriber’s information.

Connector - Connector will be requiring connecting MSC to all these Registers.

Operating frequency will be 850 MHz to 1900 MHz.

Global System for Mobile Communications (GSM)

The technology in cellular network is GSM. GSM as a network technology uses the hexagonal cells to provide the network. BTS remain in the center of each hexagonal cell. Each cell has a 4 digits unique cell Id. In a Single Cell, BTS is responsible to handle all the signal transmission.

 How One Cellular Device Tries to Communicate with Another

When a cellular device makes a call to another cellular device subscriber, the below sequence of events takes place -

First BTS (Base transceiver station) receives that request of call and route it to BSC (Base station controller). It will transfer the signal to MSC (Mobile switching center). The MSC/VLR receives the message of a call request from BSC and checks if mobile station is authorized to access the network or not. If MS is legal, it become activated. If the mobile station is not authorized, its service will be denied. MSC/VLR analyzes the number and initiates a call setup with the other device. MSC/VLR sends commands to the corresponding BSC to allocate a traffic channel. A traffic channel is a radio channel with a time slot. Then The BSC allocates the traffic channel and passes the information to the mobile station. The called device answers the call and conversation take place.