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如何在移动通信系统中建立语音业务的安全数据流透明传输通道,是移动通信系统安全语音方案设计的关键技术。移动通信标准中的TFO技术可以避免核心网侧设备的语音编解码功能,实现语音数据流的端到端透明传输通道。研究了GSM、CDMA等移动通信系统中的TFO协商流程、协商原则,重点分析和研究如何基于TFO实现移动通信安全语音业务的技术,为实现高音质的移动通信安全语音业务打下了良好基础。
How to establish a transparent transmission channel for secure data flow of voice services in a mobile communication system is a key technology for designing a secure voice scheme for a mobile communication system. The TFO technology in the mobile communication standard can avoid the speech codec function of the core network side device and realize the end-to-end transparent transmission channel of the voice data stream. This paper studies the TFO negotiation process and negotiation principle in mobile communication systems such as GSM and CDMA, and focuses on analyzing and studying how to implement secure voice service in mobile communication based on TFO, laying a good foundation for implementing high quality voice service for mobile communication.