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在LTE网络商用规模迅速扩大以及VOLTE网络客户规模仍占很小比例的情况下,TD-LTE网络中实时性要求很高的语音业务,有80%依赖于CSFB方式。因此,缩短CSFB回落时长,是无线网络优化的重点。本文主要研究GSM网络的TCH及早指配功能对CSFB回落时长的缩短原理,并提供华为和爱立信两个GSM网络设备厂家的试验效果,为无线网络优化提供参考。
With the rapidly expanding commercial scale of LTE networks and the still small proportion of VOLTE network customers, 80% of the time-critical voice services in TD-LTE networks rely on CSFB. Therefore, shortening CSFB fallback time is the key point of wireless network optimization. In this paper, we mainly study the shortening principle of CSFB fall-back time of TCH early assignment function of GSM network and provide the test results of two GSM network equipment manufacturers of Huawei and Ericsson to provide reference for wireless network optimization.