描述了UMTS系统中移动到移动语音呼叫时两种提高语音质量的方法，即TFO(Tandem Free Operation)和TrFO(Transcoder Free Operation)机制。分析了他们的操作原理后，本文的主要贡献在于对二者的性

Packet : 两种提高UMTS系统语音QoS的方法研究与实现.txt filelist

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