gNB_out : (gNB, U::1)(GTP: TEID T)(A,Z) GW-A_out: (GW-A, S1)(U::1, SGB::TEID, C1; SL=3)(A,Z)->U::1 is an End.M.GTP6.D.Di SID at SRGW-A S1_out : (GW-A, C1)(U::1, SGB::TEID, C1; SL=2)(A,Z) C1_out : (GW-A, SGB::TEID)(U::1, SGB::TEID, C1; SL=1)(A,Z) GW-B_out: (GW-B, U::1)(GTP: TEID T)(A,Z) ->SGB::TEID is an End.M.GTP6.E SID at SRGW-B UPF_out : (A,Z)