60 lines
2.7 KiB
Plaintext
60 lines
2.7 KiB
Plaintext
msc {
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hscale=2;
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ms [label="MS"], bts [label="BTS"], bsc[label="BSC"], bsc_lchan[label="BSC lchan FSM"];
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ms note bsc_lchan [label="lchan allocation sequence for RSL Channel Request"];
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ms => bts [label="RR Channel Request"];
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bts => bsc [label="RSL Channel Request"];
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bsc box bsc [label="rsl_rx_chan_rqd()"];
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bsc note bsc [label="Obtain RACH data from Request: - Reference - Access Delay (TA)
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- Request Reason - Channel Type"];
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bsc note bsc [label="If the reason is PDCH, the RACH Request is forwarded to PCU and BSC is no
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longer concerned (rsl_rx_pchan_rqd())."];
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bsc note bsc [label="Always try to allocate an SDCCH regardless of the requested type, only if no
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SDCCH is available, look for the actually requested channel type."];
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bsc box bsc [label="lchan_select_by_type(SDCCH)"];
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--- [label="IF no lchan is available (neither SDCCH nor requested type)"];
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bsc note bsc [label="Figure out T3122 value from bts->T3122, network->T3122 or
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GSM_T3122_DEFAULT"];
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bsc box bsc [label="rsl_send_imm_ass_rej(wait_ind=T3122)"];
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bsc note bsc [label="..."];
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bts <= bsc [label="RR Immediate Assign Reject"];
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ms <= bts [label="RR Immediate Assign Reject (possibly grouped with up to 4 others)"];
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bsc note bsc [label="rsl_rx_pchan_rqd() exits, no channel is allocated."];
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--- [label="END: no lchan is available"];
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bsc box bsc [label="Store RACH data in lchan->rqd_ref, rqd_ta"];
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bsc -> bsc_lchan [label="lchan_allocate(FOR_MS_CHANNEL_REQUEST)"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_ACTIV_ACK\nT3103"];
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bsc_lchan note bsc_lchan [label="The lchan FSM knows that FOR_MS_CHANNEL_REQUEST is about
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Immediate Assignment."];
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bts <= bsc_lchan [label="RSL Chan Activ (Immediate Assignment)"];
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...;
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--- [label="on any error"];
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bts <= bsc_lchan [label="RR Immediate Assign Reject"];
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ms <= bts [label="RR Immediate Assign Reject (possibly grouped with up to 4 others)"];
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---;
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...;
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bts => bsc_lchan [label="RSL Chan Activ ACK"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_\nRLL_ESTABLISH\ncontinue T3103"];
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...;
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--- [label="on timeout"];
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bsc_lchan box bsc_lchan [label="lchan_error_release(deact_sacch=true)"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_RF_RELEASE_ACK"];
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bts <= bsc_lchan [label="RLL Release Request (Local End)..."];
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bts <= bsc_lchan [label="...for all SAPIs including [0]"];
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bts <= bsc_lchan [label="RSL Deactivate SACCH"];
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bts <= bsc_lchan [label="RSL RF Channel Release"];
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...;
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bts => bsc_lchan [label="RSL RF Channel Release ACK"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_AFTER_ERROR"];
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...;
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_UNUSED"];
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---;
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ms => bsc_lchan [label="RLL Establish Ind"];
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bsc_lchan box bsc_lchan [label="associate lchan FSM with new conn FSM"];
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bsc_lchan abox bsc_lchan [label="LCHAN_ST_ACTIVE"];
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}
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