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-rw-r--r--doc/Makefile.am5
-rw-r--r--doc/assignment-fsm.dot35
-rw-r--r--doc/assignment.msc18
-rw-r--r--doc/handover-inter-bsc-mo-fsm.dot26
-rw-r--r--doc/handover-inter-bsc-mt-fsm.dot42
-rw-r--r--doc/handover-inter-bsc-mt.msc4
-rw-r--r--doc/handover-intra-bsc-fsm.dot27
-rw-r--r--doc/handover.msc4
-rw-r--r--doc/lchan-fsm.dot16
-rw-r--r--doc/lchan.msc10
-rw-r--r--doc/mgw-endpoint-fsm.dot22
-rw-r--r--doc/ms-channel-request.msc2
12 files changed, 185 insertions, 26 deletions
diff --git a/doc/Makefile.am b/doc/Makefile.am
index c11cb0804..8418c2828 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -16,8 +16,13 @@ msc: \
$(NULL)
dot: \
+ $(builddir)/assignment-fsm.png \
$(builddir)/timeslot-fsm.png \
$(builddir)/lchan-fsm.png \
+ $(builddir)/mgw-endpoint-fsm.png \
+ $(builddir)/handover-intra-bsc-fsm.png \
+ $(builddir)/handover-inter-bsc-mo-fsm.png \
+ $(builddir)/handover-inter-bsc-mt-fsm.png \
$(NULL)
$(builddir)/%.png: $(srcdir)/%.msc
diff --git a/doc/assignment-fsm.dot b/doc/assignment-fsm.dot
new file mode 100644
index 000000000..90f7621df
--- /dev/null
+++ b/doc/assignment-fsm.dot
@@ -0,0 +1,35 @@
+digraph G {
+rankdir=TB;
+
+ WAIT_LCHAN_ACTIVE
+ WAIT_RR_ASS_COMPLETE
+ WAIT_LCHAN_ESTABLISHED
+ WAIT_MGW_ENDPOINT_TO_MSC
+ terminate [shape=box]
+
+ gscon [label="conn FSM",shape=box3d];
+ gscon2 [label="conn FSM",shape=box3d];
+ lchan [label="lchan FSM",shape=box3d];
+ old_lchan [label="old lchan",shape=box3d];
+
+ invisible [style="invisible"]
+ invisible -> gscon [label="GSCON_EV_A_ASSIGNMENT_CMD",style=dashed]
+ invisible -> old_lchan [style=invisible,arrowhead=none]
+
+ gscon -> WAIT_LCHAN_ACTIVE [label="assignment_fsm_start()",style=dashed]
+ WAIT_LCHAN_ACTIVE -> lchan [label="lchan_activate()\nFOR_ASSIGNMENT",style=dashed]
+ lchan -> WAIT_LCHAN_ACTIVE [label="ASSIGNMENT_EV_\nLCHAN_\nACTIVE,ERROR",style=dashed]
+ lchan -> WAIT_LCHAN_ESTABLISHED [label="ASSIGNMENT_EV_\nLCHAN_\nESTABLISHED,ERROR",style=dashed]
+
+ WAIT_LCHAN_ACTIVE -> WAIT_RR_ASS_COMPLETE
+
+ WAIT_RR_ASS_COMPLETE -> old_lchan [label="RR Assignment\nCommand",style=dashed,constraint=false]
+ lchan -> WAIT_RR_ASS_COMPLETE [label="RR Assignment\nComplete",style=dashed]
+
+ WAIT_RR_ASS_COMPLETE -> WAIT_LCHAN_ESTABLISHED
+
+ WAIT_LCHAN_ESTABLISHED -> WAIT_MGW_ENDPOINT_TO_MSC [label="TCH"]
+ WAIT_LCHAN_ESTABLISHED -> terminate [label="non-TCH"]
+ WAIT_MGW_ENDPOINT_TO_MSC -> terminate
+ terminate -> gscon2 [label="GSCON_EV_\nASSIGNMENT_END",style=dashed]
+}
diff --git a/doc/assignment.msc b/doc/assignment.msc
index 9f10ea1ba..872161f90 100644
--- a/doc/assignment.msc
+++ b/doc/assignment.msc
@@ -6,7 +6,7 @@ msc {
ms note mgw_msc [label="lchan allocation sequence for BSSMAP Assignment Request"];
bsc_gscon <= mgw_msc [label="BSSMAP Assignment Request"];
- bsc_gscon abox bsc_gscon [label="ST_ASSIGNMENT_\nWAIT_LCHAN"];
+ bsc_gscon abox bsc_gscon [label="ST_ASSIGNMENT_\nWAIT_LCHAN\nT10?"];
bsc_lchan <- bsc_gscon [label="lchan_select_by_chan_mode(chan_mode)"];
|||;
@@ -15,13 +15,13 @@ msc {
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
---;
|||;
- bsc_gscon box bsc_gscon [label="store lchan pointer in conn->lchan_for_assignment"];
+ bsc_gscon box bsc_gscon [label="store lchan pointer in conn->assignment.new_lchan"];
bsc_lchan <- bsc_gscon [label="lchan_activate(FOR_ASSIGNMENT)"];
...;
|||;
--- [label="on lchan FSM error or timeout"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
- bsc_gscon box bsc_gscon [label="'forget' all about conn->lchan_for_assignment"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
+ bsc_gscon box bsc_gscon [label="'forget' all about conn->assignment.new_lchan"];
bsc_gscon => mgw_msc [label="BSSMAP Assignment Failure"];
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
--- [label="END: 'on error'"];
@@ -49,9 +49,9 @@ msc {
bsc_gscon -> bsc_lchan [label="LCHAN_EV_MGW_ENDPOINT_ERROR"];
bsc_lchan note bsc_gscon [label="conn FSM timeout handler exits and relies on the lchan FSM
signalling error, which should actually happen immediately:"];
- bsc_gscon <- bsc_lchan [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_gscon <- bsc_lchan [label="GSCON_EV_LCHAN_ERROR"];
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
- bsc_gscon box bsc_gscon [label="'forget' all about conn->lchan_for_assignment"];
+ bsc_gscon box bsc_gscon [label="'forget' all about conn->assignment.new_lchan"];
bsc_gscon => mgw_msc [label="BSSMAP Assignment Failure"];
--- [label="END: 'On Timeout'"];
...;
@@ -67,13 +67,13 @@ msc {
...;
bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ACTIVE"];
- bsc_gscon abox bsc_gscon [label="ST_ASSIGNMENT_\nWAIT_COMPLETE\nT10, 6s"];
+ bsc_gscon abox bsc_gscon [label="ST_ASSIGNMENT_\nWAIT_COMPLETE\nT10, 6s? T3107?"];
ms <= bsc_gscon [label="RR Assignment"];
...;
--- [label="On Timeout"];
bsc_gscon => mgw_msc [label="BSSMAP Assignment Failure"];
bsc_gscon -> bsc_lchan [label="LCHAN_EV_LCHAN_RELEASE"];
- bsc_gscon box bsc_gscon [label="'forget' all about conn->lchan_for_assignment"];
+ bsc_gscon box bsc_gscon [label="'forget' all about conn->assignment.new_lchan"];
--- [label="IF assignment_created_mgw_endpoint == true"];
bsc_gscon -> bsc_mgcp [label="mgcp_conn_delete()"];
bsc_gscon note bsc_mgcp [label="If the MGW endpoint didn't exist before the Assignment, release
@@ -84,7 +84,7 @@ msc {
...;
ms => bsc_gscon [label="RR Assignment Complete"];
bsc_gscon -> bsc_lchan [label="OLD lchan: LCHAN_EV_LCHAN_RELEASE"];
- bsc_gscon box bsc_gscon [label="conn->lchan = conn->lchan_for_assignment"];
+ bsc_gscon box bsc_gscon [label="conn->lchan = conn->assignment.new_lchan"];
--- [label="IF: chan_mode a speech mode?"];
bsc_gscon abox bsc_gscon [label="ST_WAIT_MDCX_BTS"];
bsc_gscon -> bsc_mgcp [label="mgcp_conn_modify()"];
diff --git a/doc/handover-inter-bsc-mo-fsm.dot b/doc/handover-inter-bsc-mo-fsm.dot
new file mode 100644
index 000000000..2832d0f24
--- /dev/null
+++ b/doc/handover-inter-bsc-mo-fsm.dot
@@ -0,0 +1,26 @@
+digraph G {
+rankdir=TB;
+
+ invisible [style=invisible]
+ invisible -> mo [label="Measurement Report\nincluding neighbor\nBSS ARFCN",style=dashed]
+ mo [label="inter-BSC MO HO",shape=box];
+ msc [label="msc",shape=box3d];
+ new_bsc [label="new BSC",shape=box3d]
+ lchan [label="lchan",shape=box3d]
+ term [label="terminate",shape=box];
+
+ mo -> WAIT_HO_COMMAND [label="handover_start()"]
+ WAIT_HO_COMMAND -> msc [label="BSSMAP Handover\nRequired",style=dashed]
+ msc -> new_bsc [label="BSSMAP Handover\nRequest",style=dashed]
+ new_bsc -> msc [label="BSSMAP Handover\nRequest Ack",style=dashed]
+ msc -> WAIT_HO_COMMAND [label="BSSMAP Handover\nCommand",style=dashed]
+
+ WAIT_HO_COMMAND -> lchan [label="RR Handover\nCommand\nfrom new BSC",style=dashed]
+
+ WAIT_HO_COMMAND -> WAIT_CLEAR
+ msc -> WAIT_CLEAR [label="BSSMAP Clear Command",style=dashed]
+
+ WAIT_CLEAR -> term
+
+
+}
diff --git a/doc/handover-inter-bsc-mt-fsm.dot b/doc/handover-inter-bsc-mt-fsm.dot
new file mode 100644
index 000000000..82e101aea
--- /dev/null
+++ b/doc/handover-inter-bsc-mt-fsm.dot
@@ -0,0 +1,42 @@
+digraph G {
+rankdir=TB;
+
+ mt [label="inter-BSC MT HO",shape=box];
+ gscon [label="gscon FSM",shape=box3d];
+ lchan [label="lchan FSM",shape=box3d];
+ msc [label="msc",shape=box3d];
+ old_bsc [label="old BSC",shape=box3d]
+ old_lchan [label="old lchan",shape=box3d]
+ term [label="terminate",shape=box];
+
+ invisible [style="invisible"]
+
+ mt -> old_bsc [style=dashed]
+ old_bsc -> msc [label="BSSMAP Handover Required",style=dashed]
+
+ invisible -> old_lchan [style=invisible,arrowhead=none]
+ msc -> gscon [label="BSSMAP Handover\nRequest",style=dashed]
+ gscon -> WAIT_LCHAN_ACTIVE [label="handover_start()",style=dashed]
+ WAIT_LCHAN_ACTIVE -> lchan [label="lchan_activate()\nFOR_HANDOVER",style=dashed]
+ lchan -> WAIT_LCHAN_ACTIVE [label="HO_EV_\nLCHAN_\nACTIVE,ERROR",style=dashed,constraint=false]
+ WAIT_LCHAN_ACTIVE -> WAIT_RR_HO_DETECT
+
+ WAIT_RR_HO_DETECT -> msc [label="BSSMAP\nHandover\nAccept\nwith\nRR Handover\nCommand",style=dashed,constraint=false]
+ msc -> old_bsc -> old_lchan [label="RR Handover\nCommand",style=dashed]
+
+ lchan -> WAIT_RR_HO_DETECT [label="RR Handover\nDetect",style=dashed]
+ WAIT_RR_HO_DETECT -> WAIT_RR_HO_COMPLETE
+
+ lchan -> WAIT_RR_HO_COMPLETE [label="RR Handover\nComplete",style=dashed]
+ WAIT_RR_HO_COMPLETE -> WAIT_LCHAN_ESTABLISHED
+ lchan -> WAIT_LCHAN_ESTABLISHED [label="HO_EV_LCHAN_\nESTABLISHED",style=dashed]
+
+ WAIT_LCHAN_ESTABLISHED -> term [label="non-TCH"]
+ WAIT_LCHAN_ESTABLISHED -> WAIT_MGW_ENDPOINT_TO_MSC
+ WAIT_MGW_ENDPOINT_TO_MSC -> term [label="handover_end()",style=dashed]
+ term -> msc [label="BSSMAP Handover\nComplete\n/ Failure",style=dashed,constraint=false]
+
+ err [label="on error",shape=box,style=dashed]
+ err -> term
+
+}
diff --git a/doc/handover-inter-bsc-mt.msc b/doc/handover-inter-bsc-mt.msc
index 88a52daa7..52873c14b 100644
--- a/doc/handover-inter-bsc-mt.msc
+++ b/doc/handover-inter-bsc-mt.msc
@@ -13,7 +13,7 @@ msc {
bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_TS_READY"];
...;
--- [label="on no lchan, lchan FSM error or timeout"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
bsc_gscon box bsc_gscon [label="handover_end(fail)"];
bsc_gscon => mgw_msc [label="BSSMAP Handover Failure"];
ms note bsc_gscon [label="MS happily continues on the old lchan."];
@@ -39,7 +39,7 @@ msc {
bsc_gscon -> bsc_lchan [label="LCHAN_EV_MGW_ENDPOINT_ERROR"];
bsc_lchan note bsc_gscon [label="conn FSM error handler exits and relies on the lchan FSM
signalling error, which should actually happen immediately:"];
- bsc_gscon <- bsc_lchan [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_gscon <- bsc_lchan [label="GSCON_EV_LCHAN_ERROR"];
bsc_gscon -> bsc_mgcp [label="mgcp_conn_delete()"];
bsc_gscon box bsc_gscon [label="handover_end(fail)"];
bsc_gscon => mgw_msc [label="BSSMAP Handover Failure"];
diff --git a/doc/handover-intra-bsc-fsm.dot b/doc/handover-intra-bsc-fsm.dot
new file mode 100644
index 000000000..4eb25617c
--- /dev/null
+++ b/doc/handover-intra-bsc-fsm.dot
@@ -0,0 +1,27 @@
+digraph G {
+rankdir=TB;
+
+ lchan [label="lchan FSM",shape=box3d];
+ intra [label="intra-BSC HO",shape=box];
+ old_lchan [label="old lchan",shape=box3d];
+ term [label="terminate",shape=box];
+
+ invisible [style="invisible"]
+ invisible -> intra [style=invisible,arrowhead=none]
+ invisible -> old_lchan [style=invisible,arrowhead=none]
+
+ intra -> WAIT_LCHAN_ACTIVE [label="handover_start()",style=dashed]
+ WAIT_LCHAN_ACTIVE -> lchan [label="lchan_activate(FOR_HANDOVER)",style=dashed]
+ lchan -> WAIT_LCHAN_ACTIVE [label="HO_EV_\nLCHAN_\nACTIVE,ERROR",style=dashed,constraint=false]
+ WAIT_LCHAN_ACTIVE -> WAIT_RR_HO_DETECT
+ WAIT_RR_HO_DETECT -> old_lchan [label="RR Handover\nCommand",style=dashed,constraint=false]
+
+ lchan -> WAIT_RR_HO_DETECT [label="RR Handover\nDetect",style=dashed]
+ WAIT_RR_HO_DETECT -> WAIT_RR_HO_COMPLETE
+
+ lchan -> WAIT_RR_HO_COMPLETE [label="RR Handover\nComplete",style=dashed]
+ WAIT_RR_HO_COMPLETE -> WAIT_LCHAN_ESTABLISHED
+ lchan -> WAIT_LCHAN_ESTABLISHED [label="HO_EV_LCHAN_\nESTABLISHED",style=dashed]
+
+ WAIT_LCHAN_ESTABLISHED -> term [label="handover_end()",style=dashed]
+}
diff --git a/doc/handover.msc b/doc/handover.msc
index 7529de602..b4307a831 100644
--- a/doc/handover.msc
+++ b/doc/handover.msc
@@ -13,7 +13,7 @@ msc {
bsc_lchan <- bsc_gscon [label="lchan_activate(lchan, FOR_HANDOVER)"];
...;
--- [label="on lchan FSM error or timeout"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
bsc_gscon box bsc_gscon [label="handover_end(fail)"];
ms note bsc_gscon [label="MS happily continues on the old lchan."];
bsc_gscon abox bsc_gscon [label="ST_ACTIVE"];
@@ -43,7 +43,7 @@ msc {
bsc_gscon -> bsc_lchan [label="LCHAN_EV_MGW_ENDPOINT_ERROR"];
bsc_lchan note bsc_gscon [label="conn FSM error handler exits and relies on the lchan FSM
signalling error, which should actually happen immediately:"];
- bsc_gscon <- bsc_lchan [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_gscon <- bsc_lchan [label="GSCON_EV_LCHAN_ERROR"];
bsc_gscon box bsc_gscon [label="handover_end(fail)"];
--- [label="IF handover_created_mgw_endpoint == true"];
bsc_gscon -> bsc_mgcp [label="mgcp_conn_delete()"];
diff --git a/doc/lchan-fsm.dot b/doc/lchan-fsm.dot
index dbb283cd1..b8e348e21 100644
--- a/doc/lchan-fsm.dot
+++ b/doc/lchan-fsm.dot
@@ -4,10 +4,11 @@ rankdir=TB;
invisible [style="invisible"]
UNUSED [penwidth=3.0]
WAIT_TS_READY
- WAIT_MGW_ENDPOINT_AVAILABLE
WAIT_ACTIV_ACK
+ WAIT_MGW_ENDPOINT_AVAILABLE
WAIT_IPACC_CRCX_ACK
WAIT_IPACC_MDCX_ACK
+ WAIT_MGW_ENDPOINT_CONFIGURED
WAIT_RLL_ESTABLISH
ACTIVE [penwidth=3.0]
WAIT_SAPIS_RELEASED
@@ -17,16 +18,17 @@ rankdir=TB;
BORKEN
ts [label="timeslot FSM",shape=box3d];
- gscon [label="conn FSM",shape=box3d];
+ mgwep [label="mgw endpoint\nFSM",shape=box3d];
UNUSED -> WAIT_TS_READY [label="lchan_allocate()"]
WAIT_TS_READY -> WAIT_ACTIV_ACK
WAIT_ACTIV_ACK -> WAIT_RLL_ESTABLISH
WAIT_RLL_ESTABLISH -> WAIT_MGW_ENDPOINT_AVAILABLE [label="TCH"]
WAIT_MGW_ENDPOINT_AVAILABLE -> WAIT_IPACC_CRCX_ACK [label="IPACC BTS"]
- WAIT_MGW_ENDPOINT_AVAILABLE -> ACTIVE
+ WAIT_MGW_ENDPOINT_AVAILABLE -> WAIT_MGW_ENDPOINT_CONFIGURED
WAIT_IPACC_CRCX_ACK -> WAIT_IPACC_MDCX_ACK
- WAIT_IPACC_MDCX_ACK -> ACTIVE
+ WAIT_IPACC_MDCX_ACK -> WAIT_MGW_ENDPOINT_CONFIGURED
+ WAIT_MGW_ENDPOINT_CONFIGURED -> ACTIVE
WAIT_RLL_ESTABLISH -> ACTIVE [label="non-TCH"];
WAIT_RLL_ESTABLISH -> WAIT_RF_RELEASE_ACK [label="timeout",style=dashed,constraint=false]
@@ -45,9 +47,9 @@ rankdir=TB;
WAIT_TS_READY -> UNUSED [label="error/timeout",style=dashed,constraint=false]
{WAIT_ACTIV_ACK,WAIT_RF_RELEASE_ACK} -> BORKEN [label="error/timeout",style=dashed]
- {WAIT_MGW_ENDPOINT_AVAILABLE,WAIT_IPACC_CRCX_ACK,WAIT_IPACC_MDCX_ACK} -> WAIT_SAPIS_RELEASED [label=error,style=dashed]
+ {WAIT_MGW_ENDPOINT_AVAILABLE,WAIT_IPACC_CRCX_ACK,WAIT_IPACC_MDCX_ACK,WAIT_MGW_ENDPOINT_CONFIGURED} -> WAIT_SAPIS_RELEASED [label=error,style=dashed]
- WAIT_TS_READY -> gscon [label="GSCON_EV_\nENSURE_\nMGW_ENDPOINT",style=dotted]
- gscon -> WAIT_MGW_ENDPOINT_AVAILABLE [label="LCHAN_EV_\nMGW_ENDPOINT_\n{AVAILABLE,ERROR}",style=dotted]
+ WAIT_TS_READY -> mgwep [label="CRCX",style=dotted]
+ mgwep -> WAIT_MGW_ENDPOINT_AVAILABLE [label="LCHAN_EV_\nMGW_ENDPOINT_\n{AVAILABLE,ERROR}",style=dotted]
}
diff --git a/doc/lchan.msc b/doc/lchan.msc
index 9b7d663c4..42f2fb0cd 100644
--- a/doc/lchan.msc
+++ b/doc/lchan.msc
@@ -72,7 +72,7 @@ msc {
bsc_gscon note bsc_gscon [label="conn FSM should fire on CRCX timeout"];
bsc_lchan <- bsc_gscon [label="LCHAN_EV_MGW_ENDPOINT_ERROR"];
bsc_gscon note bsc_gscon [label="conn FSM should not assume anything and wait for
- GSCON_EV_LCHAN_ALLOC_ERROR"];
+ GSCON_EV_LCHAN_ERROR"];
bsc_lchan rbox bsc_lchan [label="Do 'On any error'"];
bsc_lchan abox bsc_lchan [label="LCHAN_ST_UNUSED"];
bsc_ts <- bsc_lchan [label="TS_EV_LCHAN_UNUSED"];
@@ -142,7 +142,7 @@ msc {
bsc_lchan abox bsc_lchan [label="LCHAN_ST_WAIT_\nRLL_ESTABLISH\nT3101"];
...;
--- [label="on timeout"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
bsc_lchan -> bsc_lchan [label="lchan_fsm_pre_rf_release()"];
---;
...;
@@ -166,7 +166,7 @@ msc {
bts <= bsc_lchan [label="IPACC CRCX"];
...;
--- [label="on timeout"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
bsc_lchan -> bsc_lchan [label="lchan_graceful_release()"];
---;
...;
@@ -182,7 +182,7 @@ msc {
this; SCCPlite: the RTP port is already known from the timeslot+multiplex information."];
...;
--- [label="on timeout"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
bsc_lchan -> bsc_lchan [label="lchan_graceful_release()"];
---;
...;
@@ -288,7 +288,7 @@ msc {
bts <= bsc_lchan [label="RR Immediate Assign Reject"];
|||;
--- [label="IF FOR_ASSIGNMENT or FOR_HANDOVER"];
- bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ALLOC_ERROR"];
+ bsc_lchan -> bsc_gscon [label="GSCON_EV_LCHAN_ERROR"];
bsc_gscon note bsc_gscon [label="conn FSM shall immediately 'forget' the lchan"];
bsc_gscon => mgw_msc [label="BSSMAP\nAssignment Failure",ID=FOR_ASSIGNMENT];
bsc_gscon => mgw_msc [label="BSSMAP\nHandover Failure",ID="inter-BSC-MT HO"];
diff --git a/doc/mgw-endpoint-fsm.dot b/doc/mgw-endpoint-fsm.dot
new file mode 100644
index 000000000..8ad2e4a1f
--- /dev/null
+++ b/doc/mgw-endpoint-fsm.dot
@@ -0,0 +1,22 @@
+digraph G {
+rankdir=TB;
+ UNUSED
+ WAIT_MGW_RESPONSE
+ IN_USE
+ WAIT_DLCX_ALL
+ terminate [shape=box]
+
+ other [label="other FSM",shape=box3d]
+ other -> UNUSED [label="mgw_{crcx,mdcx}_{bts,msc}()",style=dashed]
+
+ UNUSED -> WAIT_MGW_RESPONSE
+ WAIT_MGW_RESPONSE -> IN_USE
+ IN_USE -> {WAIT_MGW_RESPONSE,WAIT_DLCX_ALL}
+
+ other2 [label="other FSM",shape=box3d]
+ other2 -> IN_USE [label="mgw_{crcx,mdcx,dlcx}_{bts,msc}()",style=dashed]
+ WAIT_DLCX_ALL -> terminate
+
+ IN_USE -> other2 [label="OTHER_EV_*",style=dashed]
+ IN_USE -> UNUSED [label="last DLCX"]
+}
diff --git a/doc/ms-channel-request.msc b/doc/ms-channel-request.msc
index 1c5b4bfb3..4b7de78e1 100644
--- a/doc/ms-channel-request.msc
+++ b/doc/ms-channel-request.msc
@@ -27,7 +27,7 @@ msc {
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\nT3103"];
+ 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)"];