Simultaneous handover scheme for IEEE 802.11 WLANs with IEEE 802.21 triggers

摘要

Handover performance in wireless networks is important, especially nowadays, when multimedia services are becoming increasingly available over the wireless devices. However, users expect uncompromised mobility when using the service. Thus, the support of multimedia services is not possible if handover is inefficient. At the same time it is clear that a strict separation between IP Layer and the Link Layer results in built-in sources of delay. The paper discusses the IEEE 802.11 and Mobile IPv4 handover performance in practical scenarios. We introduce a new simultaneous handover scheme with IEEE 802.21 triggers. In order to verify the handover performance, simulation experiments have been conducted, whose results are also presented and discussed. Keywords Handover - IEEE 802.11 - WiFi - IEEE 802.21 - Triggers - Mobile IPv4 - Simulation - ns-2 The work was supported in part by Polish National Center for Research and Development under project PBZ-MNiSW-02/II/2007.