VSS BASED SESSION SETUP MECHANISM IN IMS

作     者：Cao Yufei Liao Jianxin Qi Qi Zhu Xiaomin 

作者机构：State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China 

出 版 物：《Journal of Electronics(China)》 (电子科学学刊（英文版）)

年 卷 期：2009年第26卷第3期

页      面：387-396页

学科分类：081603[工学-地图制图学与地理信息工程] 081802[工学-地球探测与信息技术] 07[理学] 08[工学] 070503[理学-地图学与地理信息系统] 0818[工学-地质资源与地质工程] 0705[理学-地理学] 0816[工学-测绘科学与技术] 0835[工学-软件工程] 081202[工学-计算机软件与理论] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：National Science Fund for Distin-guished Young Scholars (No. 60525110) National 973 Program (No. 2007CB307100, 2007CB307103) Program for New Century Excellent Talents in University (No.NCET-04-0111) Development Fund Project for Electronic and Information Industry (Mobile Service and Application System Based on 3G) 

主　　题：IMS (IP Multimedia Subsystem) Location management Session setup Registration VSS (Visitor Subscriber Server) 

摘      要：This paper proposes a novel session setup mechanism in IMS(IP Multimedia Subsystem) by introducing the functional entity termed VSS(Visitor Subscriber Server) which is used to provide registration and location *** new mechanism aims at improving session setup procedure by a betterment of location management in *** the use of two-tier subscriber information database constituted by the HSS(Home Subscriber Server) and the VSS, the new mechanism seperates the registration procedure and location management from the S-CSCF(Serving-Call Session Control Function), and makes them be handled by the *** the same time, the new mechanism updates the signaling procedure of registration and session *** VSS based location management, the cost of registeration and session setup procedure as well as the delay of session setup procedure become *** cost and delay functions of the new session setup mechanism as well as the cost function of new registeration are ***, simulations and analysis verify that the performance of this new mechanism gets the benefit in cost and time.