Telecom Tutorials by Samir Amberkar

Location Update [Under GSM >> Signaling]    §

Step 1: Reaching till MSC/VLR.

MS

BTS

BSC

MSC

VLR

RACH, RR - Channel Request CCM - Channel Required DCM - Channel Activate DCM - Channel Activate Ack CCM - Immediate Assignent AGCH, RR - Immediate Assignment SDCCH, MM - Location Update Req1 RLM (Location Update Req) BSSMAP - Complete Layer 3 Info SCCP connection confirmed MAP - Process Access Request

1: For Layer 2 setup, MS sends SABM frame containing Location Update Req. BTS acknowledges with UA frame containing received Location Update Req.

We will continue "Location Update" in next article.

References: GSM book by Mouly and Pautet, GSM Networks book by Heine, Signaling diagrams from 24.007/24.008 (R99).

© Copyright Samir Amberkar 2010

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