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{hscale=2}
ms = MS,BSS
msc = MSC
hlr = HLR proxy
home = Home HLR
ms -> msc CM Service Request / Paging Response
msc -> hlr Send Auth Info Request
hlr <> . there still are unsent auth tuples
in the cache
hlr () . Send cached, fresh tuples
msc <- hlr Send Auth Info Result
containing auth tuples
from the proxy cache
ms <- msc Authentication Request
ms -> msc USIM requests UMTS AKA resync
Auth Failure with AUTS
msc -> hlr Send Auth Info Request
containing AUTS IE
hlr () . Mark all UMTS AKA tuples as stale
--- If the home HLR responds in time
hlr -> home Send Auth Info Request
hlr <- home Send Auth Info Result
with 5 auth tuples
hlr () . clear tuple cache, store new tuples
msc <- hlr Send Auth Info Result
ms () msc Authentication
hlr () . fill up the tuple cache as necessary
hlr -> home Send Auth Info Request
hlr <- home Send Auth Info Result
...
--- If the home HLR is unreachable
hlr -> home Send Auth Info Request
hlr <> . no link
or
response timeout
hlr () . Store the AUTS received earlier,
and set up a timer to retry SAI
(a few minutes?)
--- If no GSM AKA fallback is allowed
msc <- hlr Send Auth Info Error
ms () msc Detach
--- If GSM AKA fallback is allowed
hlr () . Resend only GSM AKA tuples, already sent earlier
msc <- hlr Send Auth Info Result
containing GSM AKA auth tuples
from the proxy cache
ms () msc 2G: Authentication
3G: Detach
---
hlr <> . AUTS timer triggers
hlr -> home Send Auth Info Request
hlr <- home Send Auth Info Result
hlr () . clear tuple cache, store new tuples
hlr () . continue to fill up the cache as necessary
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