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