第三代移动通讯网(WCDMA)通用分组无线 业务核心网技术规范 跨 Gn、Gp 接口的GPRS GTP 隧道协议 Release 1999 (2000-06) 3rd Generation Partnership Project; Technical Specification Group Core Network General Packet Radio Service(GPRS) GPRS Tunnelling Protocol(GTP) across the Gn and Gp Interface Release 1999 (2000-06)