UPF2_in : (Z,A) -> UPF2 maps the flow with UPF2_out: (U2::1, C1)(gNB, SRGW::TEID, S1; SL=3)(Z,A) -> H.Encaps.Red C1_out : (U2::1, S1)(gNB, SRGW::TEID, S1; SL=2)(Z,A) S1_out : (U2::1, SRGW::TEID)(gNB, SRGW::TEID, S1, SL=1)(Z,A) SRGW_out: (SRGW, gNB)(GTP: TEID=T)(Z,A) -> SRGW/96 is End.M.GTP6.E gNB_out : (Z,A)