117 lines
4.8 KiB
Plaintext
117 lines
4.8 KiB
Plaintext
msc {
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hscale=2;
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bts [label="MS/BTS"], bsc[label="BSC"], bsc_ts[label="BSC timeslot FSM"], bsc_lchan[label="BSC lchan FSM"];
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bsc box bsc [label="gsm_bts_alloc()"];
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bsc box bsc [label="bts->c0 = gsm_bts_trx_alloc()"];
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bsc -> bsc_ts;
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bsc_ts box bsc_ts [label="trx->ts[*].fi = osmo_fsm_inst_alloc(timeslot_fsm)"];
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bsc_ts abox bsc_ts [label="TS_ST_NOT_INITIALIZED"];
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bsc -> bsc_lchan;
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bsc_lchan box bsc_lchan [label="ts->lchan[*].ts = ts;\nts->lchan[*].nr = i;"];
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bsc_lchan box bsc_lchan [label="ts->lchan[*].fi = NULL"];
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bsc_ts note bsc_lchan [label="lchan_select() will only pick lchans from initialized timeslots of
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the right pchan kind. lchan_select() shall OSMO_ASSERT(lchan->fi)."];
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...;
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...;
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bts rbox bsc_lchan [label="reading config file"];
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...;
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bsc box bsc [label="timeslot N"];
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bsc box bsc [label="phys_chan_config X"];
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bsc_ts box bsc_ts [label="ts->pchan_from_config = X"];
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bsc_ts note bsc_ts [label="still TS_ST_NOT_INITIALIZED"];
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...;
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bsc box bsc [label="trx 1..*"];
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bsc box bsc [label="bts->trx_list add gsm_bts_trx_alloc()"];
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bsc_ts rbox bsc_lchan [label="same as for c0 above"];
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...;
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...;
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bts rbox bsc_lchan [label="Starting Operation"];
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bts => bsc_ts [label="OML Channel OPSTART ACK"];
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bsc_ts box bsc_ts [label="ts_on_oml_opstart()"];
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bsc_ts box bsc_ts [label="ts->pchan_on_init = pchan_from_config"];
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--- [label="IF dedicated TS"];
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bsc_ts box bsc_ts [label="ts->pchan = ts->pchan_on_init"];
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--- [label="ELSE: dyn TS"];
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bsc_ts box bsc_ts [label="ts->pchan = NONE"];
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--- [label="END: dyn TS"];
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bsc_ts note bsc_lchan [label="Normally, the lchan FSM never terminates. Logic dictates that
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the lchan is a child of the timeslot FSM, but it's not actually of functional importance
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beyond basic sanity. Parent term event: TS_EV_LCHAN_UNUSED"];
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bsc_ts box bsc_ts [label="Determine N = maximum number of lchans applicable to pchan_on_init"];
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bsc_ts -> bsc_lchan;
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bsc_lchan box bsc_lchan [label="ts->lchan[all N].type = osmo_fsm_inst_alloc(lchan_fsm)"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_UNUSED\n(initial state)"];
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bsc_ts -> bsc_ts [label="ts_check_init()"];
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...;
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bsc -> bsc_ts [label="RSL bootstrapped"];
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bsc_ts -> bsc_ts [label="ts_check_init()"];
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...;
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bsc_ts box bsc_ts [label="ts_check_init()"];
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--- [label="as soon as both OML and RSL are ready:"];
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bsc_ts box bsc_ts [label="ts_on_init()"];
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bsc_ts abox bsc_ts [label="TS_ST_UNUSED"];
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--- [label="dyn TS"];
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bsc_ts box bsc_ts [label="onenter of TS_ST_UNUSED:"];
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bsc_ts abox bsc_ts [label="TS_ST_WAIT_PDCH_ACT"];
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... [label="..."];
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bsc_ts abox bsc_ts [label="PDCH"];
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--- [label="END: dyn TS"];
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--- [label="END: OML and RSL ready"];
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...;
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bsc box bsc [label="lchan_select() picks an unused lchan"];
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bsc -> bsc_lchan [label="lchan_allocate()"];
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bsc_lchan -> bsc_ts [label="TS_EV_LCHAN_REQUESTED"];
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--- [label="dyn TS"];
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bsc_ts rbox bsc_ts [label="possibly switch from PDCH...\n(see timeslot FSM)"];
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bsc_ts box bsc_ts [label="ts->pchan =\n requested GSM_PCHAN_XXX type"];
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---;
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bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_READY"];
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bsc_lchan note bsc_lchan [label="RSL Chan Alloc and so fort..."];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_ESTABLISHED"];
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...;
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bsc -> bsc_lchan [label="LCHAN_EV_RELEASE"];
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bsc_lchan note bsc_lchan [label="...RSL RF Chan Release..."];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_UNUSED"];
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bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED"];
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bsc_ts abox bsc_ts [label="TS_ST_UNUSED"];
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--- [label="dyn TS"];
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bsc_ts rbox bsc_ts [label="possibly switch to PDCH"];
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---;
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...;
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...;
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bts rbox bsc_lchan [label="BTS RSL is dropped"];
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bsc box bsc [label="ipaccess_drop_rsl()"];
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bsc -> bsc_ts [label="ts[*]:"];
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bsc_ts abox bsc_ts [label="TS_ST_NOT_INITIALIZED"];
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bsc_ts note bsc_lchan [label="If it's just the RSL being dropped, transition lchan FSMs to
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LCHAN_ST_UNUSED, but keep them allocated. Unless OML is re-established, any telnet
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vty pchan modifications must not take effect."];
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bsc_ts -> bsc_lchan [label="lchan[*]:"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_UNUSED"];
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bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED (ignored)"];
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...;
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--- [label="when RSL comes back later:"];
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bsc -> bsc_ts [label="RSL bootstrapped"];
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bsc_ts box bsc_ts [label="ts_check_init()"];
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bsc_ts rbox bsc_ts [label="see ts_check_init() above"];
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...;
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...;
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bts rbox bsc_lchan [label="BTS OML is dropped"];
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bsc note bsc [label="As part of OML drop, RSL is also dropped:"];
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bsc box bsc [label="ipaccess_drop_rsl()"];
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bsc -> bsc_ts [label="ts[*]:"];
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bsc_ts abox bsc_ts [label="TS_ST_NOT_INITIALIZED"];
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bsc rbox bsc [label="see 'BTS RSL is dropped' above"];
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bsc -> bsc_ts [label="ts[*]:"];
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bsc_ts -> bsc_lchan [label="lchan[*]:"];
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bsc_lchan box bsc_lchan [label="osmo_fsm_inst_term()"];
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bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED (ignored)"];
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bsc_lchan box bsc_lchan [label="lchan->fi = NULL"];
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bsc rbox bsc [label="Continue at 'Starting Operation'"];
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}
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