Most GSM networks operate in the 900 MHz or 1800 MHz bands. GSM operators in India use the 900 MHz band. Operators like Hutch, Airtel, Idea etc use 900MHz in most areas and also use 1800Mhz in some areas.
One of the key features of GSM is the Subscriber Identity Module (SIM),a detachable smart card containing the user's subscription information and phonebook. This allows the user to retain his or her information after switching handsets. By changing SIM, users can change their sevice providers.
Major GSM operators in India are Airtel ,Vodafone Essar ,BSNL etc. Refer to Fig no 1 and Table 1 for market details.
Group Company Total Subscribers
Reliance (CDMA + GSM) 48696295
Vodafone Essar(GSM) 47466853
Tata (CDMA) 25476062
MTNL(GSM + WLL) 3350437
HFCL (CDMA) 326150
Shyam (CDMA) 108396
Total (All India) 272709111
Table no. 1
Low Signal distortion inside buildings.
Talk time is generally higher due to the pulse nature of transmission.
The availability of SIM allows users to switch networks and handsets at will.
GSM covers virtually all parts of the world so international roaming is not a problem.
Large subscriber base creates better networking effect for GSM handset makers, carriers and end users.
Since TDMA transmission is in pulse format ,it may result in interference with other electronics like high sensitive audio amplifiers.
Competition among handset manufacturers is limited and there is a high entry barrier for new entrants.
Technical limitations impose fixed maximum cell site range of 35 km.
CDMA (CODE DIVISION MULTIPLE ACCESS)
CDMA, a proprietary technology championed by Qualcomm, hailed as technology efficient in spectrum usage. About 17% of all global mobile connections is CDMA based.
CDMA also relies on View More »