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msc {
bts [label="MS/BTS"], bsc[label="BSC"], bsc_ts[label="BSC timeslot FSM"], bsc_lchan[label="BSC lchan FSM"];
bsc_ts abox bsc_ts [label="NOT_INITIALIZED"];
...;
bsc note bsc_ts [label="OML and RSL may be established in any order"];
bts => bsc_ts [label="OML: Channel OPSTART ACK"];
bsc -> bsc_ts [label="RSL bootstrapped"];
bsc_ts abox bsc_ts [label="UNUSED"];
|||;
bts rbox bsc_lchan [label="UNUSED, onenter"];
bsc_ts abox bsc_ts [label="UNUSED"];
--- [label="GPRS enabled?"];
--- [label="IF: dedicated PDCH?"];
bsc_ts abox bsc_ts [label="PDCH"];
|||;
--- [label="IF: dynamic timeslot"];
bsc_ts abox bsc_ts [label="WAIT_PDCH_ACT (4s, T23001)"];
bts <= bsc_ts [label="RSL Chan Activ of PDCH",ID="Osmocom style"];
bts <= bsc_ts [label="RSL PDCH Act",ID="ip.access style"];
...;
--- [label="timeout:"];
bsc_ts abox bsc_ts [label="BORKEN"];
---;
...;
bts => bsc_ts [label="RSL RF Chan Activ ACK",ID="Osmocom style"];
bts => bsc_ts [label="RSL PDCH Act ACK",ID="ip.access style"];
bsc_ts abox bsc_ts [label="PDCH"];
--- [label="END: GPRS enabled?"];
...;
...;
bts rbox bsc_lchan [label="UNUSED, on event"];
bsc_ts abox bsc_ts [label="UNUSED"];
bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_REQUESTED (data=lchan)"];
bsc_ts abox bsc_ts [label="IN_USE"];
bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_READY"];
bts <= bsc_lchan [label="RSL Chan Activ (and so on)"];
...;
bts rbox bsc_lchan [label="IN_USE, second lchan"];
bsc_ts abox bsc_ts [label="IN_USE"];
bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_REQUESTED (data=lchan)"];
bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_READY"];
bts <= bsc_lchan [label="RSL Chan Activ (and so on)"];
...;
...;
bts rbox bsc_lchan [label="IN_USE, when lchan FSM releases (both regularly, or due to error)"];
bsc_ts abox bsc_ts [label="IN_USE"];
bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED (data=lchan)"];
--- [label="IF all lchan->fi->state == LCHAN_ST_UNUSED"];
bsc_ts abox bsc_ts [label="UNUSED"];
---;
...;
...;
bts rbox bsc_lchan [label="PDCH, on lchan request"];
bsc_ts note bsc_lchan [label="TS_EV_LCHAN_REQUESTED should only come in on
lchans where it makes sense, both from TS kind as well as not
conflicting with other users of the lchan."];
bsc_ts abox bsc_ts [label="PDCH"];
bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_REQUESTED"];
bsc_ts abox bsc_ts [label="WAIT_PDCH_DEACT (4s, T23001)"];
bts <= bsc_ts [label="RSL RF Chan Release of PDCH",ID="Osmocom style"];
bts <= bsc_ts [label="RSL PDCH Deact",ID="ip.access style"];
...;
--- [label="timeout:"];
bsc_ts abox bsc_ts [label="BORKEN"];
bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_ERROR"];
---;
...;
bts => bsc_ts [label="RSL RF Chan Release ACK",ID="Osmocom style"];
bts => bsc_ts [label="RSL PDCH Deact ACK",ID="ip.access style"];
--- [label="IF all lchan->fi->state == LCHAN_ST_UNUSED"];
bsc_ts note bsc_lchan [label="If the lchan FSM decided to give up in the
meantime, nr of active lchans might have dropped back to zero."];
bsc_ts abox bsc_ts [label="UNUSED"];
bsc_ts note bsc_ts [label="onenter at UNUSED state will trigger back to
PDCH mode"];
|||;
--- [label="IF at least one lchan->state != LCHAN_ST_UNUSED"];
bsc_ts abox bsc_ts [label="IN_USE"];
bsc_ts rbox bsc_ts [label="Continue at 'IN_USE' above"];
...;
...;
bts rbox bsc_lchan [label="on erratic event"];
bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_ERROR"];
bsc_lchan box bsc_lchan [label="release lchan"];
...;
bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED"];
bsc_ts note bsc_ts [label="log error but ignore"];
...;
}
|
