G S M ( Global System for Mobile communication) pdf

 

G S M ( Global System for Mobile communication) 

What is GSM ?
❑Stands for global system for mobile communication.
❑GSM is a open and digital cellular technology used for mobile communication.
❑It uses 4 different frequency bands of 850mhz, 900mhz, 1800mhz and 1900mhz.
❑It uses the combination of both fdma and tdma.


 

Cell sizes in GSM network
Macro → In this size of cell, base station antenna is installed.

Micro → In this size of cell, antenna height is less than the average roof level.

Pico → Small cell diameter of few meters.

Umbrella → It covers the shadowed regions( fill the gaps between cells).

Features of GSM
❑ Supports international roaming.
❑ Clear voice clarity.
❑ Ability to support multipe handheld devices.
❑ Low service cost.
❑ New features and services.

GSM network divided into

Mobile Station ( MS ): 

❑ It consist of the physical equipment, such as the radio transceiver, display and digital signal processors and the SIM card. 

❑ It provides the air interface to the user in gsm networks. 

❑ It also provides access to the various data services available in a GSM network.

Base Station Subsystem ( BSS ):  BTS and BSC communicate across the specified abis interface, enabling operations between components that are made by different suppliers. 

Network Switching Subsystem ( NSS ):  It performs switching of calls between mobile and other fixed or mobile network user, as well as the management of mobile services such as authentications.

Operation Support Subsystem ( OSS ):  The operations and maintenance center ( OMC ) is connected to all equipment in the switching system and to the BSC. The implementation of OMC is called the operation and support system ( OSS ).

 Handoff

 It is the ability of transfer mobile cell from one bas station to another base station.

 Reason for handoff: • Mobile device moves one cell to another cell.

                                 • When capacity of a cell is exhausted.

Types of Handoff

Hand handoff: 

• Channel in source is released and only then channel in target is engaged. 

• Very cheap. 

• Only one communication at a time. 

• Disturbance. 

Soft handoff: 

• Channel in source cell is retained and used for while in parallel with channel in target cell.

• Very costly. 

• Two communication at a time. 

• No Disturbance. 

Intracell: Source and target are different cells.

Intercell:  Source and target are same cells.

 

 Here, G S M ( Global System for Mobile communication) pdf.....

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