add SGs / CSFB related dot + msc files

Those graphs + message sequence charts are not yet used by any
of our manuals, but they should become used by the OsmoMSC user
manual once SGs interface support is added.

Related: OS#2583
Change-Id: Idfd3a66c18131b5458d183b8e66f62eaaab65991

doc/manuals/images/sgs-imsi_attach_lu.msc

@@ -0,0 +1,15 @@
+msc {
+	UE, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"];
+
+	UE => MME [label="Attach Request"];
+	UE box HSS [label="Steps 3..16 of LTE Attach procedure TS 23.401"];
+	MME box MME [label="Derive VLR Number"];
+	MME => VLR [label="LU Request"];
+	VLR box VLR [label="Create SGs Association"];
+	VLR box HSS [label="MAP/GSUP UL / ISD"];
+	MME <= VLR [label="LU Accept"];
+	UE box HSS [label="Steps 17..16 of LTE Attach procedure TS 23.401"];
+	|||;
+	...;
+	MME <= VLR [label="Paging Request"];
+}

doc/manuals/images/sgs-mo_call_no_ps_ho.msc

@@ -0,0 +1,18 @@
+msc {
+	hscale=2;
+	UE, ENB [label="eNodeB"], BSS, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"];
+
+	UE => MME	[label="NAS Extended Service Request"];
+	ENB <= MME	[label="S1-AP UE Context Mod Req with CSFB"];
+	ENB => MME	[label="S1-AP UE Context Mod Resp"];
+	UE <= ENB	[label="NACC (Network Assisted Cell Change)"];
+	ENB => MME	[label="S1-AP S1 UE Context Release Req"];
+	UE box MME	[label="S1 UE Context Release"];
+
+	UE box HSS	[label="UE changes RAT then LA and/or RA update"];
+	UE <=> HSS	[label="PS Suspend (TS 23.060)"];
+
+	UE => BSS	[label="CM SERV REQ"];
+	BSS => VLR	[label="COMPL L3 (CM SERV REQ)"];
+	UE <=> VLR	[label="Normal 2G Voice Call"];
+}

doc/manuals/images/sgs-mo_sms_idle.msc

@@ -0,0 +1,21 @@
+msc {
+	hscale=2;
+	UE, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"], SMSC;
+
+	UE box HSS	[label="EPS/IMSI attach procedure"];
+	...;
+	UE box MME	[label="UE triggered Service Request"];
+	UE => MME	[label="UL NAS Transport"];
+	MME => VLR	[label="SGsAP UPLINK UNITDATA\n(CP-DATA/RP-DATA/TPDU)"];
+	VLR => SMSC	[label="MAP/GSUP Forward SM"];
+	MME <= VLR	[label="SGsAP DOWNLINK UNITDATA"];
+	UE <= MME	[label="DL NAS Transport"];
+	...;
+
+	VLR <= SMSC	[label="Delivery Report"];
+	MME <= VLR	[label="SGsAP DOWNLINK UNITDATA"];
+	UE <= MME	[label="DL NAS Transport"];
+	UE => MME	[label="UL NAS Transport"];
+	MME => VLR	[label="SGsAP UPLINK UNITDATA"];
+	MME <= VLR	[label="SGsAP RELEASE REQ"];
+}

doc/manuals/images/sgs-mt_call_idle.msc

@@ -0,0 +1,17 @@
+msc {
+	hscale=2;
+	UE, ENB [label="eNodeB"], BSS, MME, VLR [label="MSC/VLR"], PSTN;
+
+	VLR <= PSTN	[label="ISUP IAM or SIP INVITE"];
+	MME <= VLR	[label="SGsAP PAGING REQUEST"];
+	ENB <= MME	[label="Paging"];
+	UE <= MME	[label="Paging"];
+
+	UE => MME	[label="Extended Service Req"];
+	MME => VLR	[label="SGsAP SERVICE REQUEST"];
+	ENB <= MME	[label="Initial UE Ctx Setup"];
+
+	UE => BSS	[label="Paging Response"];
+	BSS => VLR	[label="COMPL L3 (PAGING RESP)"];
+	UE <=> VLR	[label="Normal 2G Voice Call"];
+}

doc/manuals/images/sgs-mt_sms_idle.msc

@@ -0,0 +1,22 @@
+msc {
+	hscale=2;
+	UE, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"], SMSC;
+
+	UE box HSS	[label="EPS/IMSI attach procedure"];
+	...;
+
+	VLR <= SMSC	[label="MAP/GSUP ForwardSM"];
+	MME <= VLR	[label="SGsAP PAGING"];
+	UE <= MME	[label="Paging"];
+	UE box MME	[label="Service Request"];
+	MME => VLR	[label="SGsAP SERVICE REQ"];
+	MME <= VLR	[label="SGsAP DL UNITDATA\n(CP-DATA/RP-DATA/TPDU)"];
+	UE <= MME	[label="DL NAS Transport"];
+	UE => MME	[label="UL NAS Transport"];
+	MME => VLR	[label="SGsAP UL UNITDATA"];
+	...;
+	UE => MME	[label="UL NAS Transport"];
+	MME => VLR	[label="SGsAP UL UNITDATA"];
+	VLR => SMSC	[label="Delivery report"];
+	MME <= VLR	[label="SGsAP RELEASE REQ"];
+}