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— The Internet Engineering Task Force has developed Mobile IP to handle mobility of Internet hosts at the network layer. Mobile IP, however, suffers from a number of drawbacks such as high handover latency, packet loss, and conflict with network security solutions. In this paper, we describe and evaluate the performance of SIGMA, a Seamless IP diversity(More)
Motivated by the observation that channel assignment for multiradio multi-channel mesh networks should support both unicast and local broadcast<sup>1</sup>, should be interference-aware, and should result in low overall switching delay, high throughput, and low overhead, we propose two flexible localized channel assignment algorithms based on(More)
—This paper focuses on designing a distributed medium access control algorithm that aims at achieving time fairness among contending stations and throughput maximization in an 802.11 wireless LAN. The core idea of our proposed algorithm lies in that each station needs to select an appropriate contention window size so as to fairly share the channel(More)
Mobile IP has been developed to handle mobility of Internet hosts at the network layer. Mobile IP (MIP), however, suffers from a number of drawbacks such as requirement of infrastructure change, high handover latency, high packet loss rate, and conflict with network security solutions. In this paper, we describe and evaluate the performance of SIGMA, a(More)
—Key predistribution has been claimed to be the only viable approach for establishing shared keys between neighboring sensors after deployment for a typical sensor network. However, none of the proposed key predistribution schemes simultaneously achieves good performance in terms of scalability in network size, key-sharing probability between neighboring(More)
— A key issue impacting the performance of multi-hop wireless networks is wireless interference among neighboring nodes. In this paper, we study the impact of interference on mean delay and available bandwidth residing at wireless nodes, and present a novel interference aware metric, named Network Allocation Vector Count (NAVC). The design of NAVC as a(More)
—We examine a widely accepted myth about passive listening in wireless networks, and give a detailed description of how to achieve real " passive listening. " Then we develop a lightweight intrusion management system called LIMS for commodity Wi-Fi networks. Our system employs novel techniques to increase network resilience to passive and active attacks(More)
A fundamental issue impacting the performance of mobile ad hoc networks is the wireless interference among neighboring nodes. In this paper, we derive an interference aware metric NAVC based on the information collected from the IEEE 802.11 Medium Access Control (MAC) layer. We then propose a novel Dynamic Interference Aware Routing protocol (DIAR) building(More)
—This paper focuses on designing a distributed medium access control algorithm for fairly sharing network resources among contending stations in an 802.11 wireless network. Because the notion of fairness is not universal and there lacks a rigorous analysis on the relationships among the four types of most popular fairness criteria, we first mathematically(More)
—We study the localization problem in sparse 3D underwater sensor networks. Considering the fact that depth information is typically available for underwater sensors, we transform the 3D underwater positioning problem into its two-dimensional counterpart via a projection technique and prove that a non-degenerative projection preserves network(More)