ETSI TS 143 050-2007 数字蜂窝通信系统(第2+阶段).GSM公用陆地移动网(PLMN)系统的语音业务的传输规划方面(版本7.0.0).3GPP TS 43.050(版本7.0.0,第7次发布)
Digital cellular telecommunications system (Phase 2+); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) System V7.0.0; 3GPP TS 43.050 version 7.0.0 Release 7