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msc {
hscale=2;
ms [label="MS"], bts [label="BTS"], bsc[label="BSC"], bsc_lchan[label="BSC lchan FSM"];
ms note bsc_lchan [label="lchan allocation sequence for RSL Channel Request"];
ms => bts [label="RR Channel Request"];
bts => bsc [label="RSL Channel Request"];
bsc box bsc [label="rsl_rx_chan_rqd()"];
bsc note bsc [label="Obtain RACH data from Request: - Reference - Access Delay (TA)
- Request Reason - Channel Type"];
bsc note bsc [label="If the reason is PDCH, the RACH Request is forwarded to PCU and BSC is no
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_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(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 -> bsc_lchan [label="lchan_allocate(FOR_MS_CHANNEL_REQUEST)"];
bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_ACTIV_ACK\nT3101"];
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)"];
...;
--- [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)"];
---;
...;
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_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"];
}
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