Voice Call continued [Under GSM >>
Signaling] §
Step 5: MS2 responds to Paging
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PGCH, RR - Paging |
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RACH - RR - Channel Request |
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CCM - Channel Required |
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DCM - Channel Activate |
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DCM - Channel Activate Ack |
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CCM - Immediate Assignent |
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AGCH, RR - Immediate Assignment |
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SDCCH, RR - Page Response1 |
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RLM (Page Response) |
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BSSMAP - Complete Layer 3 Info |
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SCCP connection confirmed |
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MAP - Process Access Request |
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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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MAP - Forward New TMSI |
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DTAP (TMSI Reallocation Command) |
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RLM (TMSI Reallocation Command) |
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SDCCH, MM - TMSI Reallocation Command |
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SDCCH, MM - TMSI Reallocation Complete |
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RLM (TMSI Reallocation Complete) |
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DTAP (TMSI Reallocation Complete) |
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MAP - TMSI Ack |
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MAP - Possible Proprietary go ahead for call |
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DTAP (CC/SETUP) |
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RLM (CC/SETUP) |
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SDCCH, CC - SETUP |
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1: For Layer 2 setup, MS sends SABM frame
containing Page Response. BTS acknowledges with UA frame
containing received Page Response.
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
