GSM Mohammad AL-adwan. Introduction GSM (Global System for Mobile Communications, originally Groupe...
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Transcript of GSM Mohammad AL-adwan. Introduction GSM (Global System for Mobile Communications, originally Groupe...
GSM
Mohammad AL-adwan
Introduction
GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard developed by (ETSI) to describe protocols for second generation (2G) digital cellular networks used by mobile phones.
1st Generation
• First use in Tokyo in 1979• Analog System• FDMA • Bw = 40 MHz between 800-900 MHz• 832 channels• 10 kbps• Voice Only
2nd Generation
• First use at end of 1980s• Digital System• TDMA / CDMA• 384 kbps• Voice and Data
3rd Generation
• First use in 2001• Digital System• WCDMA• Downlink : 14.4 Mbps || Uplink : 5.8 Mbps• Voice and Data
4th Generation
• Started in 2010 but used in 2013• Digital System• WCDMA• Downlink : 1 Gbps || Uplink : 0.5 Gbps• Voice and Data
1st Look
MSC
BS
BS
MS
MS
MSBS
1st Look
MSC
Mobile Switching Center is the head of the cellular communications process .
Any provider must have one MSC at least .
1st Look
MSC
BS
BS
MS
MS
MSBS
1st Look
BSBase Stations function is to propagate and receive EM waves .GSM is a cellular network, which means that cell phones connect to it by searching for cells in the immediate vicinity. There are five different cell sizes in a GSM network—macro, micro, pico , femto , and umbrella cells.
1st Look
BS
Some more base station equipment
Typical macro cellTypical micro cell
1st Look
MSC
BS
BS
MS
MS
MSBS
1st Look
MS
Mobile Stations are the mobile phones .In general any device have a GSM module and SIM card (Subscriber Identity Module) .
Call Flow [ 2 MS’s in the same cell ]
Call Flow [ 2 MS’s in different cells ]MSC
Challenges of GSM
1. Co-Channel Interference2. Adjacent Channel Interference
Co-Channel Interference
• Frequency Reuse
Co-Channel Interference
Adjacent Channel Interference
Frequency Bands In Jordan
Any Question ??
Thank You