Friday, July 24, 2009

What are the Layer 3 messages exchanged between mobile station and network during a successful voice call in GSM?

RR (Radio Resource)
CHANNEL REQUEST
IMMEDIATE ASSIGNMENT
CIPHERING MODE COMMAND
CIPHERING MODE COMPLETE
CHANNEL RELEASE

MM (Mobility Management)
CM SERVICE REQUEST
CM SERVICE ACCEPT
AUTHENTICATION REQUEST
AUTHENTICATION RESPONSE
IDENTITY REQUEST
IDENTITY RESPONSE
TMSI REALLOCATION COMMAND
TMSI REALLOCATION COMPLETE

CC (Call Control)
SETUP
CALL PROCEEDING
ALERTING
CONNECT
PROGRESS
DISCONNECT
RELEASE
RELEASE COMPLETE

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