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Submitted by Yogesh Alwe Tushar Pandav
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GSM (Global System For Mobile communication)
Outline
1. Introduction2. Architecture of GSM3. Features of GSM4. Services of GSM5. GSM Radio subsystem6. Call processing in GSM
3
Introduction
In 1982, the European Conference of Postal and Telecommunications Administrations (CEPT) created the GSM to develop a standard for a mobile telephone system that could be used across Europe.
The first GSM network was launched in 1991 by Radiolinja in Finland with joint technical infrastructure maintenance from Ericsson.
outline
1. Introduction2. Architecture of GSM3. Features of GSM4. Services of GSM5. GSM Radio subsystem6. Call processing in GSM
Architecture of GSM
BTS
BTS
BTS
BTS
BTS
BTS
MS
MS
BSS
BSS
MSC
OMC
PSTN
ISDN
DATAN/W
AUCHLR VLR
outline
1. Introduction2. Architecture of GSM3. Features of GSM4. Services of GSM5. GSM Radio subsystem6. Call processing in GSM
Features of GSM
Roaming in European countries. Use of SIM card. Control of transmission power. Frequency hopping. Discontinuous transmission. On air privacy for the user.
outline
1. Introduction2. Architecture of GSM3. Features of GSM4. Services of GSM5. GSM Radio subsystem6. Call processing in GSM
Services by GSM
GSM services are classified into two types:-
Tele-services
Data services
The user services are divided into three categories:-
1. Telephone services.
2. Bearer service or data services.
3. Supplementary ISDN services
outline
1. Introduction2. Architecture of GSM3. Features of GSM4. Services of GSM5. GSM Radio subsystem6. Call processing in GSM
RADIO SUBSYSTEMTS0TS1
TS7
576.92uS
4.615mS1 Frame
Time frame
200KHz
200KHz
890MHz
915MHz935MHz
960MHz
uplink
downlink 124 frames
ARFCN
25MHz
25MHz
outline
1. Introduction2. Architecture of GSM3. Features of GSM4. Services of GSM5. GSM Radio subsystem6. Call processing in GSM
Call processing in GSM
The typical signaling sequences for call flow in GSM are as follows:
Mobile call origination. Mobile call termination. Authentication. Inter-MSC call handoff.
The mobile call origination and the mobile call termination features are discussed:-
1.Mobile call origination procedure:
BTS BSC MSC GMSC
VLR
LE
1 1 34
5
6
7
7
22
77
71
Telephone
MS
2. Mobile Call Termination Procedure:
BTSBTSBTS
BTSBSC MSC GMSC
VLR HLR
LE
PSTN
12
1
2 12
63
7
1211
10
11
10
1011 98
4
5
Paging Area
Telephone
MS