Telecom Tutorials by Samir Amberkar

Intra-MSC Handover [Under GSM >> Signaling >> Handover]

Intra-MSC Handover is between two BTSs located in location areas belonging to two MSC/VLRs. Though BSC decides for a handover, it does not know whether it would be Inter-BSC HO or Inter-MSC HO. This decision is made by MSC.

MS

BTS2

BSC2

MSC

BSC1

BTS1

SACCH, RR - Measurement Report DCM - Measurement Result (DL + UL) BSSMAP - HO Required BSSMAP - HO Required SCCP connection confirmed DCM - Channel Activate DCM - Channel Activate Ack BSSMAP - HO Required Ack BSSMAP - HO Command RLM (HO Command) FACCH, RR - HO Command Layer 1 frame of new FACCH - HO Access L1 frame - PHYS INFO Layer 1 frame of new FACCH - HO Access DCM - HO Detect BSSMAP - HO Detect (new)FACCH, L2 establish RLM - Establish Ind FACCH, RR - HO Complete RLM (HO Complete) TCH - Call continues BSSMAP - Clear Command DCM - (old) TCH release BSSMAP - Clear Complete SCCP Release

References: GSM Networks book by Heine, GSM book by Mouly and Pautet, Signaling diagrams from 24.007/24.008 (R99), 04.18 (RR procedures).

© Copyright Samir Amberkar 2010

Intra-BSC HO «

GSM Index

» Inter-MSC HO