Voice Call continued [Under GSM >>
Signaling]
Step 2: Authentication, Ciphering
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MAP - Process Access Request |
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VLR1 |
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VLR2 |
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MAP - Send Identification |
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MAP - response for Send Identification |
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MAP - Authenticate |
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DTAP (Authentication Request) |
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RLM (Authentication Request) |
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SDCCH, MM - Authentication Request |
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SDCCH, MM - Authentication Response |
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RLM (Authentication Response) |
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DTAP (Authentication Response) |
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MAP - Authenticate Response |
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MAP - Set Ciphering |
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BSSMAP - Cipher Mode Command |
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DCM (Encryption Command) |
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SDCCH, RR - Cipher Mode Command |
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SDCCH, RR - Cipher Mode Complete |
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RLM (Ciphering Mode Complete) |
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BSSMAP - Cipher Mode Command |
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MAP - Process Access Accepted |
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We will continue "Voice Call" in next article.
References: GSM
Networks book by Heine, GSM
book by Mouly and Pautet, Signaling diagrams from
24.007/24.008 (R99).
© Copyright Samir Amberkar 2010
