digraph G {
	rankdir=LR;

	SGW [label="S-GW"];
	PGW [label="P-GW"];

	UE -> eNodeB [label="Radio"];
	eNodeB -> MME [label="S1-MME\nControl Plane"];
	eNodeB -> SGW [label="S1-U\nUser Plane"];
	MME -> HSS [label="S6a\nDIAMETER"];
	MME -> SGW [label="S11"];
	SGW -> PGW [label="S5/S8\nGTP"];
	PGW -> Internet [label="SGi"];
}