diff options
Diffstat (limited to 'doc/sequence_charts/call_reestablishment.ladder')
| -rw-r--r-- | doc/sequence_charts/call_reestablishment.ladder | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/doc/sequence_charts/call_reestablishment.ladder b/doc/sequence_charts/call_reestablishment.ladder new file mode 100644 index 000000000..ccf834622 --- /dev/null +++ b/doc/sequence_charts/call_reestablishment.ladder @@ -0,0 +1,36 @@ +{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 |