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