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在规划 UMTS 网络时,尤其是 R4及其之后的分组话音网络时,要充分注意到承载网及其他环节对话音质量产生的影响,在网络设计规划时要充分注意计算网络端到端的时延,可能的抖动及其上下限值,恰当选取承载网,确保承载网 QoS 机制和带宽实时保证能力,以确保未来建成的网络能优质、高效、并能大容量地提供话音业务。北电网络积多年的分组网络话音经验,在 UMTS 系统设计阶段即充分考虑了未来 UMTS 网络的话音质量问题,在系统实现时采取了多种手段和方式来确保话音质量。这些手段包括了一些北电的专利算法,主要功能包括:网络回音消除(ECAN)、移动回音控制(MEC)、自动增益控制(AGC)、背景噪音调节(BNC)和背景噪音降
When planning the UMTS network, especially the packet voice network after R4 and beyond, we should pay full attention to the influence of the bearer network and other links on the voice quality. During the network design planning, we should pay enough attention to calculate the network end-to-end delay, Possible jitter and its upper and lower limits, proper selection of bearer network to ensure that bearer network QoS mechanism and real-time bandwidth guarantee capabilities to ensure that the future built of the network can be high quality and efficiency, and can provide large-capacity voice services. Nortel Networks has accumulated years of experience in packet voice networking. During the design phase of the UMTS system, it fully considered the voice quality problems of the UMTS network in the future and adopted various means and methods to ensure the voice quality when the system was implemented. These include some of Nortel’s proprietary algorithms. Key features include ECAN, MEC, AGC, BNC and background noise reduction