Neels Hofmeyr | 44fcc9f | 2018-05-28 14:29:49 +0200 | [diff] [blame^] | 1 | msc { |
| 2 | hscale=2; |
| 3 | bts [label="MS/BTS"], bsc[label="BSC"], bsc_ts[label="BSC timeslot FSM"], bsc_lchan[label="BSC lchan FSM"]; |
| 4 | |
| 5 | bsc_ts abox bsc_ts [label="NOT_INITIALIZED (no timeout)"]; |
| 6 | |
| 7 | ...; |
| 8 | bsc note bsc_ts [label="OML and RSL may be established in any order"]; |
| 9 | bts => bsc_ts [label="OML: Channel OPSTART ACK"]; |
| 10 | bsc -> bsc_ts [label="RSL bootstrapped"]; |
| 11 | bsc_ts abox bsc_ts [label="UNUSED (no timeout)"]; |
| 12 | |
| 13 | |||; |
| 14 | bts rbox bsc_lchan [label="UNUSED, onenter"]; |
| 15 | bsc_ts abox bsc_ts [label="UNUSED"]; |
| 16 | --- [label="GPRS enabled?"]; |
| 17 | --- [label="IF: dedicated PDCH?"]; |
| 18 | bsc_ts abox bsc_ts [label="PDCH (no timeout)"]; |
| 19 | |
| 20 | |||; |
| 21 | --- [label="IF: dynamic timeslot"]; |
| 22 | bsc_ts abox bsc_ts [label="WAIT_PDCH_ACT (?s, Tnnnn)"]; |
| 23 | bts <= bsc_ts [label="RSL Chan Activ of PDCH",ID="Osmocom style"]; |
| 24 | bts <= bsc_ts [label="RSL PDCH Act",ID="ip.access style"]; |
| 25 | ...; |
| 26 | --- [label="timeout:"]; |
| 27 | bsc_ts abox bsc_ts [label="BORKEN"]; |
| 28 | ---; |
| 29 | ...; |
| 30 | bts => bsc_ts [label="RSL RF Chan Activ ACK",ID="Osmocom style"]; |
| 31 | bts => bsc_ts [label="RSL PDCH Act ACK",ID="ip.access style"]; |
| 32 | bsc_ts abox bsc_ts [label="PDCH (no timeout)"]; |
| 33 | |
| 34 | --- [label="END: GPRS enabled?"]; |
| 35 | ...; |
| 36 | ...; |
| 37 | |
| 38 | bts rbox bsc_lchan [label="UNUSED, on event"]; |
| 39 | bsc_ts abox bsc_ts [label="UNUSED"]; |
| 40 | bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_REQUESTED (data=lchan)"]; |
| 41 | bsc_ts abox bsc_ts [label="IN_USE"]; |
| 42 | bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_READY"]; |
| 43 | bts <= bsc_lchan [label="RSL Chan Activ (and so on)"]; |
| 44 | ...; |
| 45 | bts rbox bsc_lchan [label="IN_USE, second lchan"]; |
| 46 | bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_REQUESTED (data=lchan)"]; |
| 47 | bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_READY"]; |
| 48 | bts <= bsc_lchan [label="RSL Chan Activ (and so on)"]; |
| 49 | ...; |
| 50 | ...; |
| 51 | bts rbox bsc_lchan [label="IN_USE, when lchan FSM releases (both regularly, or due to error)"]; |
| 52 | bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED (data=lchan)"]; |
| 53 | --- [label="IF all lchan->fi->state == LCHAN_ST_UNUSED"]; |
| 54 | bsc_ts abox bsc_ts [label="UNUSED"]; |
| 55 | ---; |
| 56 | ...; |
| 57 | ...; |
| 58 | |
| 59 | |
| 60 | bts rbox bsc_lchan [label="PDCH on lchan request"]; |
| 61 | bsc_ts note bsc_lchan [label="TS_EV_LCHAN_REQUESTED should only come in on |
| 62 | lchans where it makes sense, both from TS kind as well as not |
| 63 | conflicting with other users of the lchan."]; |
| 64 | |
| 65 | bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_REQUESTED"]; |
| 66 | bsc_ts abox bsc_ts [label="WAIT_PDCH_DEACT (?s, Tnnnn)"]; |
| 67 | bts <= bsc_ts [label="RSL RF Chan Release of PDCH",ID="Osmocom style"]; |
| 68 | bts <= bsc_ts [label="RSL PDCH Deact",ID="ip.access style"]; |
| 69 | ...; |
| 70 | --- [label="timeout:"]; |
| 71 | bsc_ts abox bsc_ts [label="BORKEN"]; |
| 72 | bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_ERROR"]; |
| 73 | ---; |
| 74 | ...; |
| 75 | bts => bsc_ts [label="RSL RF Chan Release ACK",ID="Osmocom style"]; |
| 76 | bts => bsc_ts [label="RSL PDCH Deact ACK",ID="ip.access style"]; |
| 77 | --- [label="IF all lchan->fi->state == LCHAN_ST_UNUSED"]; |
| 78 | bsc_ts note bsc_lchan [label="If the lchan FSM decided to give up in the |
| 79 | meantime, nr of active lchans might have dropped back to zero."]; |
| 80 | bsc_ts abox bsc_ts [label="UNUSED"]; |
| 81 | bsc_ts note bsc_ts [label="onenter at UNUSED state will trigger back to |
| 82 | PDCH mode"]; |
| 83 | |||; |
| 84 | --- [label="IF at least one lchan->state != LCHAN_ST_UNUSED"]; |
| 85 | bsc_ts abox bsc_ts [label="IN_USE"]; |
| 86 | bsc_ts rbox bsc_ts [label="Continue at 'IN_USE' above"]; |
| 87 | ...; |
| 88 | ...; |
| 89 | |
| 90 | bts rbox bsc_lchan [label="on erratic event"]; |
| 91 | bsc_ts -> bsc_lchan [label="LCHAN_EV_TS_ERROR"]; |
| 92 | bsc_lchan box bsc_lchan [label="release lchan"]; |
| 93 | ...; |
| 94 | bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED"]; |
| 95 | bsc_ts note bsc_ts [label="log error but ignore"]; |
| 96 | ...; |
| 97 | |
| 98 | } |