21-06-2012, 02:22 PM
OVERVIEW Of GSM MOBILE COMMUNICATION
[attachment=24995]
GSM Network Components
Mobile station
Base Transceiver Station (BTS)
Base Station Controller (BSC)
Mobile Services Switching Center (MSC)
Home Location Register (HLR)
Visitor Location Register (VLR)
Authentication Center (AUC)
Equipment Identity Register (EIR)
Operation and Maintenance Center (ONMC)
Operation and Support System (OSS)
GSM Geographical Network Structure
Cell: A cell is the basic unit of a cellular system and is defined as the area of radio coverage given by one BS antenna system.
Location Area (LA) : A Location Area (LA) is defined as a group of cells. Within the network, a subscriber’s location is known by the LA, which they are in.
MSC Service area : An MSC service area is made up of a number of LAs and represents the geographical part of the network controlled by one MSC.
Public Land Mobile Network (PLMN) Service area : It is the entire set of cells served by one network operator.
The GSM service area : It is the entire geographical area in which a subscriber can gain access to a GSM network.
GSM Frequency Bands
GSM 900 : The original frequency band specified for GSM was 900 MHz. Most GSM networks worldwide use this band.
GSM 1800 : By granting licenses for GSM 1800 in addition to GSM 900, a country can increase the number of operators. In this way, due to increased competition, the service to subscribers is improved.
GSM 1900 : This was basically introduced for person to person communication, the PCS concept. The frequencies available for PCS was around 1900MHz.
GSM 400 : Introduction of GSM in the 450 MHz frequency band will further leverage the success of global GSM.
[attachment=24995]
GSM Network Components
Mobile station
Base Transceiver Station (BTS)
Base Station Controller (BSC)
Mobile Services Switching Center (MSC)
Home Location Register (HLR)
Visitor Location Register (VLR)
Authentication Center (AUC)
Equipment Identity Register (EIR)
Operation and Maintenance Center (ONMC)
Operation and Support System (OSS)
GSM Geographical Network Structure
Cell: A cell is the basic unit of a cellular system and is defined as the area of radio coverage given by one BS antenna system.
Location Area (LA) : A Location Area (LA) is defined as a group of cells. Within the network, a subscriber’s location is known by the LA, which they are in.
MSC Service area : An MSC service area is made up of a number of LAs and represents the geographical part of the network controlled by one MSC.
Public Land Mobile Network (PLMN) Service area : It is the entire set of cells served by one network operator.
The GSM service area : It is the entire geographical area in which a subscriber can gain access to a GSM network.
GSM Frequency Bands
GSM 900 : The original frequency band specified for GSM was 900 MHz. Most GSM networks worldwide use this band.
GSM 1800 : By granting licenses for GSM 1800 in addition to GSM 900, a country can increase the number of operators. In this way, due to increased competition, the service to subscribers is improved.
GSM 1900 : This was basically introduced for person to person communication, the PCS concept. The frequencies available for PCS was around 1900MHz.
GSM 400 : Introduction of GSM in the 450 MHz frequency band will further leverage the success of global GSM.