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msc {
hscale=2;
ms [label="MS via BTS"], bsc_lchan[label="BSC lchan FSM"], bsc_gscon[label="BSC conn FSM"],
msc_[label="MSC"];
ms note msc_ [label="inter-BSC Handover to another BSS"];
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
bsc_gscon box bsc_gscon [label="bsc_handover_start(): init conn->ho"];
bsc_gscon -> bsc_gscon [label="GSCON_EV_HO_START (inter-BSC MO)"];
bsc_gscon abox bsc_gscon [label="ST_HANDOVER_MO_\nWAIT_HO_CMD\nT7"];
bsc_gscon => msc_ [label="BSSMAP Handover Required"];
...;
--- [label="On Timeout"];
ms note bsc_gscon [label="MS happily continues on the old lchan."];
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
bsc_gscon box bsc_gscon [label="handover_end(fail)"];
--- [label="END: 'On Timeout'"];
...;
bsc_gscon <= msc_ [label="BSSMAP Handover Command"];
bsc_gscon abox bsc_gscon [label="ST_HANDOVER_MO_\nWAIT_CLEAR_CMD\nT8"];
ms <= bsc_gscon [label="RR Handover Command"];
...;
--- [label="On Timeout"];
ms note bsc_gscon [label="MS happily continues on the old lchan."];
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
bsc_gscon box bsc_gscon [label="handover_end(fail)"];
--- [label="END: 'On Timeout'"];
...;
msc_ note msc_ [label="Remote BSS reported Handover Complete to the MSC, this connection has been
superseded."];
bsc_gscon <= msc_ [label="BSSMAP Clear Command"];
bsc_gscon abox bsc_gscon [label="ST_CLEARING"];
bsc_gscon => msc_ [label="BSSMAP Clear Complete"];
bsc_lchan <- bsc_gscon [label="LCHAN_EV_RELEASE"];
ms <=> bsc_lchan [label="release procedure (async)"];
}
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