ETSI TR 101 518-2005 数字蜂窝通信系统(第2+阶段).支持GPRS的改进版PLMN和原先的GPRS移动之间的互通3GPP TR 09.95(版本6.4.0,1997年发布)
Digital cellular telecommunications system (Phase 2+); Interworking between modified PLMN supporting GPRS and legacy GPRS mobiles (3GPP TR 09.95 version 8.0.0 Release 1999)