Telecom Tutorials by Samir Amberkar

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

Intra-BTS handover is about switching the TCH. It is "synchronised" as it is within one BTS.

MS

BTS

BSC

MSC

SACCH, RR - Measurement Report DCM - Measurement Result (DL + UL) DCM - Channel Activate DCM - Channel Activate Ack RLM (Handover Command) (old)FACCH, RR - Handover Command Layer 1 frame of new FACCH - HO Access-11 HO Access-2 HO Access-3 HO Access-4 (new)FACCH, L2 establish (new)FACCH, RR - Handover Complete RLM - Establish Ind BSSMAP - HO Performed DCM - (old) TCH release TCH - Call continues

1: HO Access sent four times (indicating synchronised HO)

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

Handover - 1 «

GSM Index

» Intra-BSC HO