naa a22 4500 510795773 CHVBK 20180411083336.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11277-012-0503-z doi (NATIONALLICENCE)springer-10.1007/s11277-012-0503-z IMS-Based Centralized Service Continuity [Elektronische Daten] [Wei-Kuo Chiang, Po-Chiang Kuo] The IP Multimedia Subsystem (IMS) has been selected as a telecommunication industrial standard for the signal processing in the heterogeneous access networks. It is also brought up to handle the mobility management. However, the mobility of the user equipment (UE) may disrupt or even intermittently disconnect an ongoing real-time session, which heavily affects the satisfaction of the users. Therefore, how to reduce the service disruption time gets more and more important. This paper first proposes a centralized service continuity scheme, abbreviated as CSC, in IMS-based networks. The CSC treats handover as a service in the IMS network. Its architecture and operation are based on service invocation. The service continuity procedure is performed by an application server called CSC AS. The CSC AS can carry out the third-party call control for fast session re-establishment by initiating two INVITE requests concurrently. In addition, a variant of the CSC, denoted by CSC*, is derived by adopting the E-IMS AKA with one-pass authentication for achieving the acceleration of IMS registration during the handover. Analytical results show that both schemes could shorten the handover latency significantly, as compared with the standard IMS-based service continuity. Springer Science+Business Media, LLC., 2012 Service invocation nationallicence Third party call control nationallicence IP multimedia subsystem nationallicence Chiang Wei-Kuo Department of Computer Science and Information Engineering, National Chung Cheng University, 621, Chiayi, Taiwan, ROC aut Kuo Po-Chiang Department of Computer Science and Information Engineering, National Chung Cheng University, 621, Chiayi, Taiwan, ROC aut Wireless Personal Communications Springer US; http://www.springer-ny.com 68/3(2013-02-01), 1177-1195 0929-6212 68:3<1177 2013 68 11277 https://doi.org/10.1007/s11277-012-0503-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0503-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chiang Wei-Kuo Department of Computer Science and Information Engineering, National Chung Cheng University, 621, Chiayi, Taiwan, ROC aut NATIONALLICENCE 700 1- Kuo Po-Chiang Department of Computer Science and Information Engineering, National Chung Cheng University, 621, Chiayi, Taiwan, ROC aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 68/3(2013-02-01), 1177-1195 0929-6212 68:3<1177 2013 68 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer