Jingwen Yang,Zhongping Zhang. Research of GSM/GPRS Data Roaming Users’ Home Domain Access Solution[J]. Telecommunications Science, 2007, 23(10): 11-16.
3GPP TS 23.060 Appendix A. APN and GGSN selection, 2005
2
3GPP TS 29.061 V4.10.1.Interworking between the public land mobile network (PLMN) supporting packet based services and packet data networks (PDN)， 2005
3
3GPP TS 29.060 V4.11.0.GPRS tunnelling protocol (GTP) across the gn and gp interface， 2004
4
3GPP TR 32.815 v6.1.0.Online charging system (OCS) architecture study， 2005
