Context-aware handoff middleware for transparent service continuity in wireless networks
Pervasive and Mobile Computing
TCP Adaptation for Vertical Handoff Using Network Monitoring
ICCS '07 Proceedings of the 7th international conference on Computational Science, Part IV: ICCS 2007
Online Network Resource Management for QoS-Sensitive Multimedia Services
KES-AMSTA '07 Proceedings of the 1st KES International Symposium on Agent and Multi-Agent Systems: Technologies and Applications
AdHoc probe: end-to-end capacity probing in wireless ad hoc networks
Wireless Networks
Review: An overview of vertical handover techniques: Algorithms, protocols and tools
Computer Communications
Improving Slow-start based probing mechanisms for flow adaptation after handovers
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Vertical handoffs between different wireless technologies usually lead to dramatic changes in the link capacity. A successful QoS solution for vertical handoffs must be able to fast track the capacity changes and agilely adapt the delivery rates and qualities of the ongoing applications. Though traditional AIMD-based source adaptation schemes (as found in TCP, TFRC, etc.) have been well designed for mild, gradual rate adjustments required by load fluctuations and network congestion, their response time is inadequate when the rate must be adjusted to the drastic network capacity changes that are typical in vertical handoff scenarios. To expedite the response to such changes, we propose in this paper two adaptive algorithms, named the Fast Rate Adaptation (FRA) and Early Rate Reduction (ERR), that are launched when the handoff is from low to high capacity (LOW-to-HIGH) or from high to low capacity (HIGH-to-LOW), respectively. We also propose two vertical handoff notification mechanisms to work with FRA and/or ERR, i.e. the Implicit Handoff Notification (IHN) and Explicit Handoff Notification (EHN). We show by simulation that our proposed schemes are able to provide better QoS support than the traditional AIMD based schemes during vertical handoffs.