VoIP Performance in SIP-Based Vertical Handovers Between WLAN and GPRS/UMTS Networks

  title={VoIP Performance in SIP-Based Vertical Handovers Between WLAN and GPRS/UMTS Networks},
  author={Marc Cardenete-Suriol and Josep Mangues-Bafalluy and Marc Portoles-Comeras and Manuel Requena-Esteso and M{\'o}nica Gorricho},
  journal={2007 IEEE International Conference on Communications},
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… 

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