Playing with the GSM RF Interface - CCC Event Weblog

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Simplified GSM Network Structure diagram to better understand the abbreviations and acronyms Diagram derived from Wikipedia (http://en.wikipedia.org/wiki/File:Gsm_network.png), GNU Free Documentation License applies to this diagram
OpenBTS - Hardware based on the USRP (Universal Software Radio Peripheral) - Air Interface (Um) is a Software Defined Radio - Does not model classic GSM architecture (BSC, MSC, ...) but uses a direct Um-to-SIP approach - Uses Asterisk via SIP (Session Initiation Protocol) and Voice-over-IP
Page 1 and 2: Playing with the GSM RF Interface 2
Page 3: Motivation - GSM system and protoco
Page 7 and 8: nanoBTS versus BS11
Page 9 and 10: What about an „open“ phone ? -
Page 11 and 12: Sniffing the air traffic - (Very) s
Page 13 and 14: GSM TDMA (Time division multiple ac
Page 15 and 16: Message flow Channel Request If the
Page 17 and 18: Lab results, BTS with 2 TRX Note: A
Page 19 and 20: DoS Attack demonstration setup
Page 21: Questions ?

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