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authorHarald Welte <laforge@gnumonks.org>2017-12-21 20:57:27 +0100
committerNeels Hofmeyr <neels@hofmeyr.de>2018-11-27 17:12:40 +0100
commit3a6ad2a2a22b13cc2d9d6b3d873032f187aeae2c (patch)
tree7c8a13f7323d07def6118933fbb5df3a51eeba8f /doc/manuals
parentd22e31fc9b0639b87c1b394286492549b433b0e8 (diff)
add message sequence chart MS/BTS/BSC/MSC for 3GPP aoIP MO call
Diffstat (limited to 'doc/manuals')
-rw-r--r--doc/manuals/message-sequences/mo_call-abis_a.msc146
1 files changed, 146 insertions, 0 deletions
diff --git a/doc/manuals/message-sequences/mo_call-abis_a.msc b/doc/manuals/message-sequences/mo_call-abis_a.msc
new file mode 100644
index 000000000..4597ab126
--- /dev/null
+++ b/doc/manuals/message-sequences/mo_call-abis_a.msc
@@ -0,0 +1,146 @@
+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 resoures 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"];
+
+ ...;
+
+}