13GPP TS 23.060 Appendix A.APN and GGSN selection, 2005
23GPP TS 29.061 V4.10.1.Interworking between the public land mobile network (PLMN) supporting packet based services and packet data networks (PDN), 2005
33GPP TS 29.060 V4.11.0.GPRS tunnelling protocol (GTP) across the gn and gp interface,2004
43GPP TR 32.815 v6.1.0.Online charging system (OCS) architecture study, 2005
53GPP TS 23.203 V9.13.0.policy and charging control architecture.2013,09.
63GPP TS 29.212 V9.14.0.policy and charging control (pcc); reference points.2013,06.
73GPP TS 29.215 V9.13.0.policy and charging control over s9 reference point.2014,06.
