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通过对3G系统的技术标准的研究和对3G系统提供的相关业务流程的分析,讨论了通过3G系统进行语音保密通信的三种模式:即TrFO模式(Transcoder Free Operation)、类语音模式和VOIP模式。文中阐述了每种模式下保密语音的传输过程,利用类语音模式和VOIP模式,开发出的TD-SCDMA保密手机成功地实现了保密话音在3G系统(TD-SCDMA)中的传送,保密话音音质良好,而TrFO模式的实现则还有待于TrFO功能的开通。
Through the research on the technical standards of 3G system and the analysis of the related business processes provided by 3G system, three modes of voice secure communication through 3G system are discussed: TrFO mode (Transcoder Free Operation), voice-like mode and VOIP mode . In this paper, the transmission process of confidential voice in each mode is described. By using voice-like mode and VOIP mode, the developed TD-SCDMA secure handset successfully implements the transmission of secure voice in 3G system (TD-SCDMA) Good, and the realization of TrFO mode has yet to be opened TrFO function.