ETSI TS 144 064-2008 数字蜂窝通信系统(第2+阶段).移动台-伺服GPRS支持节点(MS-SGSN).逻辑链路控制(LLC)层规范(版本7.3.0).3GPP TS 44.064(版本7.3.0,第7次发布)
Digital cellular telecommunications system (Phase 2+); Mobile Station - Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) Layer Specification V7.3.0; 3GPP TS 44.064 version 7.3.0 Release 7