The design and implementation of a quality-based handover trigger

Abstract. Wireless connectivity is needed to bring IP-based telephony into serious competition with the existing cellular infrastructure. How-ever it is well known that voice quality problems can occur when used with unlicensed spectrum technologies such as the popular IEEE 802.11 standards. The cellular infrastructure could provide alternative network access should users roam out of 802.11 coverage or if heavy traffic loads are encountered in the 802.11 cell. Therefore, our goal is to design a han-dover mechanism to switch ongoing calls to the cellular network when the 802.11 network cannot sustain sufficient call quality. We have in-vestigated load and coverage scenarios and designed, implemented and evaluated the performance of an 802.11 quality-based trigger for the han-dover of voice calls to the cellular network. We show that our predictive solution addresses the coverage problem and evaluate it within a real setting.