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{hscale=2}
ms = MS
cell1 = Cell 1 (BTS+BSC)
cell0 = Cell 0 (BTS+BSC)
msc = MSC
ms () msc Call Re-Establishment
ms [] msc Ongoing voice call: MM is established
...
ms ->< cell0 radio link fails
ms ><- cell0
msc <> . Keep MM until timeout
ms -> cell1 Channel Required
ms <- cell1 Immediate Assignment
ms -> cell1 Complete Layer3
cell1 -> msc Complete Layer3:
CM Re-Establishment Request
cell0 <- msc Clear Command
cell0 -> msc Clear Complete
cell1 <- msc Authentication Request
cell1 -> msc Authentication Response
cell1 <- msc Cipher Mode Commad
cell1 -> msc Cipher Mode Complete
cell1 <- msc Assignment Request
this Assignment ACKs the CM Re-Establishment
ms <- cell1 RR Assignment Command
ms -> cell1 RR Assignment Complete
cell1 -> msc Assignment Complete
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