Title :
VoIP Performance in SIP-Based Vertical Handovers Between WLAN and GPRS/UMTS Networks
Author :
Cardenete-Suriol, M. ; Mangues-Bafalluy, Josep ; Portoles-Comeras, M. ; Requena-Esteso, M. ; Gorricho, M.
Author_Institution :
Pare Mediterrani de la Tecnologia, Barcelona
Abstract :
This paper experimentally analyzes the handover performance of VoIP sessions in a wireless overlay of 802.11 WLANs and GPRS/UMTS networks when mobility is handled at the application layer by SIP. It also assesses the impact of handovers on the VoIP call quality perceived by the user by means of the extended E-model. The study reveals that good performance values are achieved when handing over from GPRS/UMTS to WLAN. Additionally, acceptable quality is obtained for handovers from WLAN towards UMTS. On the other hand, unacceptable values are achieved when moving towards GPRS. The main reason is the delay experienced by SIP messages when traversing the cellular network.
Keywords :
3G mobile communication; Internet telephony; cellular radio; signalling protocols; wireless LAN; GPRS-UMTS networks; SIP-based vertical handovers; VoIP; VoIP call quality; WLAN; cellular network; wireless overlay; 3G mobile communication; Delay; Ground penetrating radar; Land mobile radio cellular systems; Performance analysis; Radio access networks; Radio control; Telecommunications; Wireless LAN; Wireless application protocol;
Conference_Titel :
Communications, 2007. ICC '07. IEEE International Conference on
Conference_Location :
Glasgow
Print_ISBN :
1-4244-0353-7
DOI :
10.1109/ICC.2007.328
