diff options
Diffstat (limited to 'doc/ms-channel-request.msc')
| -rw-r--r-- | doc/ms-channel-request.msc | 68 |
1 files changed, 32 insertions, 36 deletions
diff --git a/doc/ms-channel-request.msc b/doc/ms-channel-request.msc index c0ef60fc7..1c5b4bfb3 100644 --- a/doc/ms-channel-request.msc +++ b/doc/ms-channel-request.msc @@ -1,8 +1,8 @@ msc { - hscale=3; - ms [label="MS"], bts [label="BTS"], bsc[label="BSC"], bsc_gscon[label="BSC conn FSM"]; + hscale=2; + ms [label="MS"], bts [label="BTS"], bsc[label="BSC"], bsc_lchan[label="BSC lchan FSM"]; - ms note bsc_gscon [label="lchan allocation sequence for RSL Channel Request"]; + ms note bsc_lchan [label="lchan allocation sequence for RSL Channel Request"]; ms => bts [label="RR Channel Request"]; bts => bsc [label="RSL Channel Request"]; @@ -13,51 +13,47 @@ msc { longer concerned (rsl_rx_pchan_rqd())."]; bsc note bsc [label="Always try to allocate an SDCCH regardless of the requested type, only if no SDCCH is available, look for the actually requested channel type."]; - bsc box bsc [label="lchan_alloc(SDCCH, allow_bigger=0)"]; + bsc box bsc [label="lchan_select_by_type(SDCCH)"]; --- [label="IF no lchan is available (neither SDCCH nor requested type)"]; bsc note bsc [label="Figure out T3122 value from bts->T3122, network->T3122 or GSM_T3122_DEFAULT"]; - bsc box bsc [label="rsl_send_imm_ass_rej()"]; + bsc box bsc [label="rsl_send_imm_ass_rej(wait_ind=T3122)"]; bsc note bsc [label="..."]; bts <= bsc [label="RR Immediate Assign Reject"]; ms <= bts [label="RR Immediate Assign Reject (possibly grouped with up to 4 others)"]; bsc note bsc [label="rsl_rx_pchan_rqd() exits, no channel is allocated."]; - ---; + --- [label="END: no lchan is available"]; bsc box bsc [label="Store RACH data in lchan->rqd_ref, rqd_ta"]; - bsc abox bsc [label="Start lchan->act_timer (4s, lchan_act_tmr_cb())"]; - - bsc box bsc [label="rsl_chan_activate_lchan(RSL_ACT_INTRA_IMM_ASS)"]; - --- [label="is the chosen lchan on dynamic timeslot that is currently used as PDCH?"]; - bsc box bsc [linecolor=red,label="Osmocom style dyn TS use the lchan->act_timer for an RSL RF - Channel Release, to release PDCH mode. This will actually overwrite above act_timer!"]; - bts <= bsc [label="i) RSL RF Chan Release of PDCH (Osmocom dyn TS)"]; - bts <= bsc [label="OR ii) RSL PDCH Deact (ip.access dyn TS)"]; - bsc -> bsc_gscon [label="gsm0808_assign_req() returns early"]; - bsc_gscon abox bsc_gscon [label="ST_WAIT_ASS_COMPL (GSM0808_T10_VALUE=6s)"]; + bsc -> bsc_lchan [label="lchan_allocate(FOR_MS_CHANNEL_REQUEST)"]; + bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_ACTIV_ACK\nT3103"]; + bsc_lchan note bsc_lchan [label="The lchan FSM knows that FOR_MS_CHANNEL_REQUEST is about + Immediate Assignment."]; + bts <= bsc_lchan [label="RSL Chan Activ (Immediate Assignment)"]; ...; - bts note bsc_gscon [linecolor="red", - label="Osmocom style dyn TS use lchan->act_timer to watch over RF Chan Release, but there - seems to be no timer watching over PDCH Deact!"]; - ...; - bts => bsc [label="i) RSL RF Chan Release ACK (Osmocom dyn TS)"]; - bts => bsc [label="OR ii) RSL PDCH Deact ACK (ip.access dyn TS)"]; - bsc box bsc [label="rsl_chan_activate_lchan() re-invoked"]; + --- [label="on any error"]; + bts <= bsc_lchan [label="RR Immediate Assign Reject"]; + ms <= bts [label="RR Immediate Assign Reject (possibly grouped with up to 4 others)"]; ---; - - bsc box bsc [label="lchan->state = LCHAN_S_ACT_REQ"]; - bts <= bsc [label="RSL Chan Activ: Immediate Assignment"]; ...; - bsc note bsc [label="Timeout of lchan->act_timer causes the - lchan->state to go to LCHAN_S_BROKEN, but no events or actions - are triggered."]; + bts => bsc_lchan [label="RSL Chan Activ ACK"]; + bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_\nRLL_ESTABLISH\ncontinue T3103"]; + ...; + --- [label="on timeout"]; + bsc_lchan box bsc_lchan [label="lchan_error_release(deact_sacch=true)"]; + bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_RF_RELEASE_ACK"]; + bts <= bsc_lchan [label="RLL Release Request (Local End)..."]; + bts <= bsc_lchan [label="...for all SAPIs including [0]"]; + bts <= bsc_lchan [label="RSL Deactivate SACCH"]; + bts <= bsc_lchan [label="RSL RF Channel Release"]; ...; - bts => bsc [label="RSL Chan Activ ACK"]; - bsc box bsc [label="rsl_rx_chan_act_ack()"]; - bsc box bsc [label="Stop lchan->act_timer"]; - bsc box bsc [label="lchan->state = LCHAN_S_ACTIVE"]; - bsc -> bsc [label="S_LCHAN_ACTIVATE_ACK (has no effect)"]; - bsc note bsc [label="Since this was an Immediate Assignment, no further action is required on - behalf of the BSC. The MS is now free to use the lchan."]; + bts => bsc_lchan [label="RSL RF Channel Release ACK"]; + bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_AFTER_ERROR"]; + ...; + bsc_lchan abox bsc_lchan [label="LCHAN_ST_UNUSED"]; + ---; + ms => bsc_lchan [label="RLL Establish Ind"]; + bsc_lchan box bsc_lchan [label="associate lchan FSM with new conn FSM"]; + bsc_lchan abox bsc_lchan [label="LCHAN_ST_ACTIVE"]; } |