| 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"]; |
| } |