03-12-2012, 04:45 PM
Group Special Mobile
[attachment=42295]
INTRODUCTION OF GSM
At the beginning of the 1980s it was realized that the European Countries were using many different, incompatible mobile phones Systems. At the same time, the needs for telecommunication services were remarkably increased.
Due to this, CEPT (Conference Europeans Pastes Telecommunications) founded a group to specify a common mobile system for Western Europe. This group was named “Group Special Mobile” and the system name GSM arose. But after that it is known as Global System for Mobile. Communications.
OPEN INTERFACE OF GSM
GSM specifications define two truly open interfaces, which limiting certain parts of the GSM
system.
GSM network is made up of three subsystems:-
Network Switching Subsystem (NSS)
Base Station Subsystem (BSS)
Network Management Subsystem (NMS)
. THE MS (MOBILE STATION)
It is a combination of terminal equipment and subscriber data. The terminal equipment as such is called ME (Mobile Equipment) and the subscriber's data is stored in a separate mudule called SIM (Subscriber Identity Module).
Therefore, ME + SIM = MS
BASE STATION SUBSYSTEM(BSS):-
A BSS itself may cover a considerably large geographical area consisting of many
Cells. Each cell is identified by an identification number called Cell Global Identity
(CGI) which comprises the following elements:
The Base Station Controller (BSC)
It is the central network element of the BSS and it controls the radio network. This means, that the main responsibilities of the BSC are make Connection Establishment between MS and NSS, Mobility management, Statistical Raw data collection Air and An interface signaling support.
The Base Transceiver Station (BTS)
It is a network element maintaining the Air interface. It takes care of Air interface signaling, Air interface Ciphering and speech processing. Speech processing refers to all the functions; the BTS performs in order to guarantee an error-free Connection between the MS and the BTS.
[attachment=42295]
INTRODUCTION OF GSM
At the beginning of the 1980s it was realized that the European Countries were using many different, incompatible mobile phones Systems. At the same time, the needs for telecommunication services were remarkably increased.
Due to this, CEPT (Conference Europeans Pastes Telecommunications) founded a group to specify a common mobile system for Western Europe. This group was named “Group Special Mobile” and the system name GSM arose. But after that it is known as Global System for Mobile. Communications.
OPEN INTERFACE OF GSM
GSM specifications define two truly open interfaces, which limiting certain parts of the GSM
system.
GSM network is made up of three subsystems:-
Network Switching Subsystem (NSS)
Base Station Subsystem (BSS)
Network Management Subsystem (NMS)
. THE MS (MOBILE STATION)
It is a combination of terminal equipment and subscriber data. The terminal equipment as such is called ME (Mobile Equipment) and the subscriber's data is stored in a separate mudule called SIM (Subscriber Identity Module).
Therefore, ME + SIM = MS
BASE STATION SUBSYSTEM(BSS):-
A BSS itself may cover a considerably large geographical area consisting of many
Cells. Each cell is identified by an identification number called Cell Global Identity
(CGI) which comprises the following elements:
The Base Station Controller (BSC)
It is the central network element of the BSS and it controls the radio network. This means, that the main responsibilities of the BSC are make Connection Establishment between MS and NSS, Mobility management, Statistical Raw data collection Air and An interface signaling support.
The Base Transceiver Station (BTS)
It is a network element maintaining the Air interface. It takes care of Air interface signaling, Air interface Ciphering and speech processing. Speech processing refers to all the functions; the BTS performs in order to guarantee an error-free Connection between the MS and the BTS.