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Voice over WLAN (VoWLAN) - A wireless voice alternative?

Voice over WLAN (VoWLAN) is a natural evolution of VoIP. It is also a potential supplement or a potential competitor to 3G mobile systems. This article presents an overview of WLAN technologies and the issues that are relevant for voice communication over WLAN. The basic IEEE 802.11 mechanisms, and new security and QoS mechanisms recently being standardised by IEEE are described. Handover issues are addressed. A review of available papers on real-time communication over WLAN highlights the challenges to VoWLAN. There is also a short discussion on 3G-VoWLAN interworking. Finally user equipment aspects and the market potentials are discussed. Introduction Wireless Local Area Networks (WLANs) have become very popular in recent years. The most popular technology is based on IEEE Standard 802.11 [1]. 802.11-based WLANs are often considered as wireless extension to Ethernet standardised in IEEE Standard 802.3 [2]. WLAN is both used as an alternative and a complement to wired LAN. With the increasing popularity of IP technology, real-time applications such as interactive two-way voice and multimedia over IP have become popular. A natural evolution of voice over IP is voice over WLAN (VoWLAN). Like VoIP the growth of the VoWLAN market has been slower than analysts predicted a 1-2 years ago. Still it is predicted that the market will take off soon. The main hurdles to VoWLAN seems to be,