| msc { |
| hscale=2; |
| ms [label="MS"], |
| bts [label="BTS"], |
| bsc_l [label="BSC(lchan SDCCH)"], |
| bsc_l2 [label="BSC(lchan TCH)"], |
| bsc [label="BSC"], |
| mgw [label="MGW@BSC"], |
| m_sc [label="MSC"]; |
| |
| ...; |
| --- [label="MS Requests dedicated channel"]; |
| ms -> bts [label="RACH: REQ"]; |
| bts -> bsc [label="RSL Cchan CHAN RQD"]; |
| bsc_l <= bsc [label="allocate lchan (RR IMM ASS)", textcolor="red", linecolor="red"]; |
| bts <- bsc_l [label="RSL Dchan (SDCCH) CHAN ACT"]; |
| bts -> bsc_l [label="RSL Dchan (SDCCH) CHAN ACT ACK"]; |
| bts <- bsc_l [label="RSL Cchan IMM ASS (RR IMM ASS)"]; |
| bsc_l box bsc_l [label="Start T3101"]; |
| ms <- bts [label="AGCH: RR IMM ASS"]; |
| --- [label="MS Establishes SDCCH"]; |
| ms -> bts [label="SDCCH: SABM (CM SERV REQ)"]; |
| ms <- bts [label="SDCCH: UA (CM SERV REQ)"]; |
| bts -> bsc_l [label="RSL RLL (SDCCH, SAPI0, DCCH) EST IND", textcolor="green", linecolor="green"]; |
| bsc_l box bsc_l [label="Stop T3101"]; |
| bsc_l => bsc [label="GSCON_EV_A_CONN_REQ", textcolor="red", linecolor="red"]; |
| bsc -> m_sc [label="SCCP CR (BSSMAP COMPL L3 (CM SERV REQ))"]; |
| bsc <- m_sc [label="SCCP CC"]; |
| bsc -> bsc [label="GSCON_EV_A_CONN_CFM", textcolor="red", linecolor="red"]; |
| ms box m_sc [label="Authentication, MM info, ..."]; |
| bsc <- m_sc [label="SCCP DT1 (DTAP (CM SERV ACK)"]; |
| bsc -> bsc [label="GSCON_EV_MT_DTAP", textcolor="red", linecolor="red"]; |
| bsc_l <= bsc [label="lchan_submit_dtap(CM SERV ACK)", textcolor="red", linecolor="red"]; |
| bts <- bsc_l [label="RSL RLL (SDCCH) DATA REQ (CM SERV ACK)", textcolor="green", linecolor="green"]; |
| ms <- bts [label="SDCCH: I (CM SERV ACK)"]; |
| ms -> bts [label="SDCCH: I (CC SETUP)"]; |
| bts -> bsc_l [label="RSL RLL (SDCCH) DATA IND (CC SETUP)", textcolor="green", linecolor="green"]; |
| bsc_l -> bsc [label="GSCON_EV_MO_DTAP", textcolor="red", linecolor="red"]; |
| bsc -> m_sc [label="SCCP DT1 (DTAP (CC SETUP))"]; |
| ...; |
| |
| --- [label="MSC assigns Voice Channel (TCH)"]; |
| bsc <- m_sc [label="SCCP DT1 (BSSMAP ASSIGNMENT CMD)"]; |
| bsc -> bsc [label="GSCON_EV_A_ASSIGNMENT_CMD", textcolor="red", linecolor="red"]; |
| bsc_l2 <= bsc [label="allocate lchan", textcolor="red", linecolor="red"]; |
| bts <- bsc_l2 [label="RSL Dchan (TCH) CHAN ACT"]; |
| bts -> bsc_l2 [label="RSL Dchan (TCH) CHAN ACT ACK"]; |
| bts <- bsc_l [label="RSL RLL (SDDCH) DATA REQ (RR ASSIGNMENT CMD)", textcolor="green", |
| linecolor="green"]; |
| bsc_l2 box bsc_l2 [label="Start T3107"]; |
| ms <- bts [label="SDCCH: I (RR ASSIGNMENT CMD)"]; |
| ms box ms [label="local-end RLL release", textcolor="green", linecolor="green"]; |
| bts -> bsc_l [label="RSL RLL (SDCCH) REL IND", textcolor="gray", linecolor="green"]; |
| bsc_l => bsc [label="GSCON_EV_RLL_REL_IND", textcolor="gray", linecolor="red"]; |
| bts -> bsc_l [label="RSL Dchan (SDCCH) CONN FAIL IND", textcolor="gray", linecolor="green"]; |
| bsc_l => bsc [label="GSCON_EV_CONN_FAIL", textcolor="gray", linecolor="red"]; |
| bsc_l box bsc_l [label="BSC must ignore failures on old channel"]; |
| ms -> bts [label="TCH: SABM (RR ASSIGNMENT CMPL)"]; |
| ms <- bts [label="TCH: UA (RR ASSIGNMENT CMPL)"]; |
| bts -> bsc_l2 [label="RSL RLL (TCH, SAPI0, DCCH) EST IND", textcolor="green", linecolor="green"]; |
| bsc_l2 box bsc_l2 [label="Stop T3107"]; |
| bsc_l2 => bsc [label="GSCON_EV_RR_ASS_COMPL", textcolor="red", linecolor="red"]; |
| |
| bsc_l <= bsc [label="release_lchan(SDCCH)", textcolor="red", linecolor="red"]; |
| bts box bsc_l [label="local-end RLL release", textcolor="green", linecolor="green"]; |
| bts <- bsc_l [label="RSL Dchan (SDCCH) RF CHAN REL"]; |
| bts <- bsc_l [label="RSL RLL (SDCCH, SAPI0, DCCH) REL REQ", textcolor="gray", linecolor="green"]; |
| bts <- bsc_l [label="RSL DChan (SDCCH) DEACTIVATE SACCH", textcolor="gray", linecolor="black"]; |
| bts -> bsc_l [label="RSL RLL (SDCCH, SAPI0, DCCH) RF FAIL IND", textcolor="gray", linecolor="green"]; |
| bts -> bsc_l [label="RSL Dchan (SDCCH, SAPI0, DCCH) RF CHAN REL ACK"]; |
| |
| # connect BTS RTP with BSC-MGW RTP |
| --- [label="BSC configures RTP on BTS and both sides of MGW"]; |
| bts <- bsc [label="RSL IPA CRCX", textcolor="blue", linecolor="blue"]; |
| bts box bts [label="Bind to BTS-local RTP Port (1000)", textcolor="blue", linecolor="blue"]; |
| bts -> bsc [label="IPA CRCX ACK (BTS:1000)", textcolor="blue", linecolor="blue"]; |
| bsc -> mgw [label="MGCP CRCX rtpbridge/2@mgw (BTS:1000)", textcolor="blue", linecolor="blue"]; |
| mgw box mgw [label="Bind to MGW-local RTP Port (2000)\nConnect to BTS:1000", textcolor="blue", linecolor="blue"]; |
| bsc <- mgw [label="MGCP CRCX rtpbridge/2@mgw OK (MGW:2000)", textcolor="blue", linecolor="blue"]; |
| bts <- bsc [label="IPA MDCX (MGW:2000)", textcolor="blue", linecolor="blue"]; |
| bts box bts [label="Connect RTP socket to remote (MGW) RTP Port", textcolor="blue", linecolor="blue"]; |
| bts -> bsc [label="IPA MDCX ACK", textcolor="blue", linecolor="blue"]; |
| bsc >> mgw [label="MGCP MDCX rtpbridge/2@mgw", textcolor="gray", linecolor="gray"]; |
| bsc << mgw [label="MGCP MDCX rtpbridge/2@mgw OK", textcolor="gray", linecolor="gray"]; |
| ...; |
| |
| --- [label="BSC finally can report successful TCH assignment"]; |
| bsc -> m_sc [label="SCCP DT1 (BSSMAP ASSGN CMPL (3GPP AoIP MGW:3000))"]; |
| m_sc box m_sc [label="Connect remote RTP to MGW addr from ASSGN CMPL"]; |
| ...; |
| |
| mgw <-> m_sc [label="RTP Audio MGW:3000 MSC:4000", textcolor="blue", linecolor="blue"]; |
| bts <-> mgw [label="RTP Audio BTS:1000 MGW:2000", textcolor="blue", linecolor="blue"]; |
| ms <-> bts [label="Um Audio (bidirectional)", textcolor="blue", linecolor="blue"]; |
| ms <-> m_sc [label="DTAP CC ALERTING"]; |
| ...; |
| |
| --- [label="Further signalling in parallel with RTP (simplified)"]; |
| ms <- m_sc [label="DTAP CC CONNECT"]; |
| ms -> m_sc [label="DTAP CC CONNECT ACK"]; |
| --- [label="Voice Call in Progress"]; |
| ...; |
| --- [label="B-end hangs up"]; |
| ms <- m_sc [label="DTAP CC DISCONNET"]; |
| ms <- m_sc [label="DTAP CC RELEASE"]; |
| ms <- m_sc [label="DTAP CC RELEASE COMPL"]; |
| ...; |
| bsc <- m_sc [label="SCCP DT1 (BSSMAP CLEAR CMD)"]; |
| bsc -> bsc [label="GSCON_EV_A_CLEAR_CMD", textcolor="red", linecolor="red"]; |
| --- [label="BSC must release terrestrial resources before reporting CLEAR COMPLETE"]; |
| mgw <- bsc [label="MGCP DLCX rtpbridge/2@mgw", textcolor="blue", linecolor="blue"]; |
| mgw box mgw [label="Release MSC-facing local RTP port (3000)", textcolor="blue", linecolor="blue"]; |
| mgw -> bsc [label="MGCP DLCX rtpbridge/2@mgw OK", textcolor="blue", linecolor="blue"]; |
| |
| mgw <- bsc [label="MGCP DLCX rtpbridge/2@mgw", textcolor="blue", linecolor="blue"]; |
| mgw box mgw [label="Release BTS-facing local RTP port (2000)", textcolor="blue", linecolor="blue"]; |
| mgw -> bsc [label="MGCP DLCX rtpbridge/2@mgw OK", textcolor="blue", linecolor="blue"]; |
| |
| bts <- bsc [label="IPA DLCX", textcolor="blue", linecolor="blue"]; |
| bts box bts [label="Release BTS-local RTP port (1000)", textcolor="blue", linecolor="blue"]; |
| bts -> bsc [label="IPA DLCX OK", textcolor="blue", linecolor="blue"]; |
| |
| bsc -> bsc [label="GSCON_EV_RSL_CLEAR_COMPL", textcolor="red", linecolor="red"]; |
| bsc -> m_sc [label="SCCP DT1 (BSSMAP CLEAR COMPL)"]; |
| bsc <- m_sc [label="SCCP RLSD"]; |
| bsc -> bsc [label="GSCON_EV_A_DISC_IND", textcolor="red", linecolor="red"]; |
| bsc -> m_sc [label="SCCP RLC"]; |
| |
| --- [label="BSC releases radio resources after CLEAR COMPLETE"]; |
| bsc_l2 <= bsc [label="release_lchan(TCH)", textcolor="red", linecolor="red"]; |
| bts <- bsc_l2 [label="RSL RLL (TCH, SAPI0, DCCH) DATA REQ (RR CHANNEL RELEASE)", textcolor="green", linecolor="green"]; |
| bsc_l2 box bsc_l2 [label="Start T3109"]; |
| bts <- bsc_l2 [label="RSL Dchan (TCH) DEACTIVATE SACCH"]; |
| ms <- bts [label="TCH: I (RR CHANNEL RELEASE)"]; |
| ms -> bts [label="TCH: DISC (RR CHANNEL RELEASE)"]; |
| bts -> bsc_l2 [label="RSL RLL (TCH, SAPI0, DCCH) REL IND", textcolor="green", linecolor="green"]; |
| bsc_l2 => bsc [label="GSCON_EV_RLL_REL_IND", textcolor="red", linecolor="red"]; |
| bsc_l2 box bsc_l2 [label="Stop T3109; Start T3111"]; |
| # optional: Conn Fail? |
| bts <- bsc_l2 [label="RSL Dchan (TCH, SAPI0, DCCH) RF CHAN REL"]; |
| bts -> bsc_l2 [label="RSL Dchan (TCH, SAPI0, DCCH) RF CHAN REL ACK"]; |
| bsc_l2 box bsc_l2 [label="T3111 timeout: Channel can be used again"]; |
| |
| ...; |
| |
| } |