Handovers:
Between 1 and 2 – Inter BTS / Intra BSC.
Between 1 and 3 – Inter BSC/ Intra MSC.
Between 1 and 4 – Inter MSC
Security in GSM:
On air interface, GSM uses encryption and TMSI instead of IMSI.
SIM is provided 4-8 digit PIN to validate the ownership of SIM.3 algorithms are specified :- A3 algorithm for authentication
- A5 algorithm for encryption
- A8 algorithm for key generation
- A5 algorithm for encryption
- A8 algorithm for key generation
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