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引用次数: 3
摘要
LTE网络是基于分组交换的网络，不支持语音通话等电路交换网络特性。运营商一直在尝试分阶段并行部署LTE网络，他们也在支持传统网络。需要支持语音通话。支持语音呼叫服务客户的方法有很多。电路交换回落(CSFB)，同步语音和LTE (SV-LTE)， Over The Top解决方案(OTT)，通过通用接入的LTE语音(VoLGA)和基于IMS的LTE语音(VoLTE)。SRVCC是LTE用户处于基于IMS的主动语音会话时的语音呼叫切换过程。在SRVCC的情况下，控制由家庭网络执行，导致语音中断和通话掉线。为了克服这些问题，引入了ATCF和ATGW实体。本文阐述了SRVCC中存在的问题、原因及解决方法。
Solution to Reduce Voice Interruption Time during Handover of VoLTE Call in Enhanced Single Radio Voice Call Continuity
LTE network is a packet switched based network, which does not support circuit switched network feature like voice call. Operators have been trying to deploy LTE network in phases and in parallel they are supporting legacy networks too. It is necessary to support voice call. There are many approaches for supporting voice call to serve customer. Circuit Switched Fall Back (CSFB), Simultaneous Voice & LTE (SV-LTE), Over The Top solution (OTT), Voice over LTE via Generic Access (VoLGA) and IMS based Voice over LTE (VoLTE). SRVCC is a voice call handover process for an LTE user, while it is in active IMS based voice session. In case of SRVCC, control is performed by the home network which causes voice interruption & call drops. To overcome these issues ATCF and ATGW entities have been introduced. This paper explains about the issues, causes and solution in SRVCC.
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