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msc {
hscale=2;
ms [label="MS/BTS"], lchan[label="BSC lchan FSM"], ass[label="BSC Assignment FSM"],
gscon[label="BSC conn FSM"], msc_[label="MSC"];
ms note msc_ [label="lchan allocation sequence for BSSMAP Assignment Request"];
gscon <= msc_ [label="BSSMAP Assignment Request"];
gscon note gscon [label="GSCON_EV_ASSIGNMENT_START\n data=struct assignment_request"];
gscon abox gscon [label="ST_ASSIGNMENT"];
ass <- gscon [label="assignment_fsm_start()"];
ass abox ass [label="ASSIGNMENT_ST_\nWAIT_LCHAN_ACTIVE"];
|||;
--- [label="On any error (no lchan, etc.)"];
ass box ass [label="on_assignment_failure()"];
ass => msc_ [label="BSSMAP Assignment Failure"];
ass abox ass [label="terminate"];
ass -> gscon [label="GSCON_EV_ASSIGNMENT_END"];
gscon abox gscon [label="ST_ACTIVE"];
---;
|||;
lchan abox lchan [label="UNUSED"];
ass box ass [label="conn->assignment.new_lchan = lchan_select_by_chan_mode()"];
lchan <- ass [label="lchan_activate(FOR_ASSIGNMENT)"];
lchan abox lchan [label="WAIT_TS_READY"];
lchan rbox lchan [label="most details omitted, see lchan_fsm and lchan_rtp_fsm diagrams"];
...;
|||;
--- [label="on lchan FSM error or timeout"];
lchan -> ass [label="ASSIGNMENT_EV_LCHAN_ERROR"];
ass box ass [label="on_assignment_failure()"];
ass rbox gscon [label="See 'On any error' above"];
--- [label="END: 'on error'"];
...;
...;
lchan abox lchan [label="LCHAN_ST_WAIT_ACTIV_ACK"];
ms <= lchan [label="RSL Chan Activ"];
...;
ms => lchan [label="RSL Chan Activ ACK"];
lchan -> ass [label="ASSIGNMENT_EV_LCHAN_ACTIVE"];
ass abox ass [label="ASSIGNMENT_ST_\nWAIT_RR_ASS_COMPLETE"];
ms <= ass [label="RR Assignment Command"];
lchan note ass [label="The lchan FSM will continue with RSL and RTP while the Assignment FSM waits.
ASSIGNMENT_EV_LCHAN_ESTABLISHED means that both RSL and RTP are established.
Usually, RTP will be done first, and the ASSIGNMENT_EV_LCHAN_ESTABLISHED may be
received even before ASSIGNMENT_EV_RR_ASSIGNMENT_COMPLETE.
assignment_fsm_wait_lchan_established_onenter() decides whether to wait or not."];
...;
ms => lchan [label="RSL EST IND"];
lchan -> ass [label="ASSIGNMENT_EV_LCHAN_ESTABLISHED",ID="(may come as early as this, or...)"];
ms => ass [label="RR Assignment Complete (came with EST IND)"];
ass abox ass [label="ASSIGNMENT_ST_\nWAIT_LCHAN_ESTABLISHED"];
--- [label="IF lchan is not in LCHAN_ST_ESTABLISHED yet (waiting for RTP)"];
...;
lchan rbox lchan [label="when lchan RTP FSM is done with setting up RTP"];
lchan -> ass [label="ASSIGNMENT_EV_LCHAN_ESTABLISHED",ID="(...may come only now)"];
---;
ass abox ass [label="ASSIGNMENT_ST_WAIT_\nMGW_ENDPOINT_TO_MSC"];
ass -> gscon [label="gscon_connect_mgw_to_msc()"];
...;
ass <- gscon [label="ASSIGNMENT_EV_MSC_MGW_OK"];
ass box ass [label="assignment_success()"];
ass => msc_ [label="BSSMAP Assignment Complete"];
ass -> gscon [label="gscon_change_primary_lchan()"];
lchan <- gscon [label="LCHAN_RTP_EV_ESTABLISHED"];
ass abox ass [label="terminate"];
ass -> gscon [label="GSCON_EV_ASSIGNMENT_END"];
gscon abox gscon [label="ST_ACTIVE"];
}
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