文档介绍：语音呼叫业务的跨域连续性研究
刘荣朵
(信息产业部电信研究院通信标准研究所, 北京 100045)
摘要:传统电路域将在一定时期内与 IMS 域共存,并同时为用户提供话音业务。用户在传
统电路域还是在 IMS 域接受呼叫是 VCC 业务解决的一个问题;用户在传统电路域和 IMS
域之间进行切换时,如何保证话音业务的连续性是 VCC 业务解决的另一个问题。3GPP 定
义的 VCC 业务和 3GPP2 定义的 VCC 业务,在本文分别得到了描述,两者之间的差异也在
文中进行了比分析。补充业务的实现是 VCC 业务当前面临的一个问题,文章的最后对此进
行了较为详细的分析。
关键词:语音业务连续性域选择域切换补充业务
Voice Call Continuity Research
Liu Rongduo
( Institute munication Standards Research , China Academy of munication
Research of MII, Beijing 100045, China)
Abstract: The legacy circuit switch domain will coexist with IMS domain in a long time in the
future, and both will provide voice call for the subscriber. Does the subscriber receive a call in CS
domain or in IMS domain, is one of the problems VCC will solve. When the subscriber transfers
from CS domain to IMS domain, and vise vas, how to keep the continuity of the voice call is
another problem VCC will solve. The VCC defined by 3GPP and 3GPP2 are all described in the
article, the deference of the VCC defined by the two different anizations is analyzed
in the paper. Supplementary services are the main problem VCC faced, detailed analysis is given
in the end of the paper.
Key words: VCC Domain Selection Domain Transfer Supplementary Services
一、概述
语音业务一直是传统电信运营商的主要收入来源,近几年来,基于 IP 的网络和业务技
术给传统电信运营商带来了挑战。目前电信运营商正在积极寻求能够驾驭 IP 网络的解决方
案。IMS 使得在 IP 网络上实现会话型多媒体类业务成为可能,也使得固定、移动网络