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EPC内部是靠QoS机制实现的，IMS和EPC通过Rx接口进行EPC侧的QoS预留：
GBR，语音业务最高优先级QCI=1。
QCI=1: Example Services: Conversational voicemscbsc
QCI=2: Conversational Video (Live streaming)
QCI=3: Real Time Gaming
QCI=4: Non-conversational voice (buffered streaming)
Non-GBR:
QCI=5: IMS signaling
QCI=6: Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc)
QCI=7: Voice, Video (live streaming), interactive gaming
QCI=8: Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc)
QCI=9: Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc)