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Our previous work proposes a macro model that controls the flows across naturally occurring bottlenecks in multi-hop wireless networks. The macro model resembles a conventional wired network, and allows us to apply extant research on flow control directly to ad hoc networks. In this paper, we further justify the feasibility of applying our macro model of ad hoc networks to access control and the validity...
The aggregate capacity of wireless mesh networks can be improved significantly by equipping each node with multiple interfaces and by using multiple channels in order to reduce the effect of interference. Since the number of available channels is limited, it is desired to allocate and reallocate channels on-demand. In this paper, a Cluster Channel Assignment (CCA) approach is proposed, to maximize...
The development of efficient call admission control schemes for next generation wireless cellular networks remains a challenging and yet unresolved problem, due to the rapidly growing number of multimedia applications and to user mobility. In recent work we have modeled the behavior of H.263 videoconference traces with the use of a discrete autoregressive (DAR(1)) model. Based on this model, we then...
The diversity of the applications supported by wireless ad hoc and sensor networks explain the success of these networks. However, their energy constrained nature requires the use of energy efficient strategies to maximize network lifetime. We can classify these strategies in four categories: 1. energy efficient routing, 2. scheduling the nodes sleeping state, 3. topology control by tuning node transmission...
In order to evaluate the behavior and performance of protocols for wireless networks, simulations are a good compromise between cost and complexity, on the one hand, and accuracy of the results, on the other hand. Since there are many simulators for wireless networks, it is often difficult to decide which simulator to choose. To help shed light on this issue, we present a case study in which four...
Over the last ten years, evolutions in nomadic terminals and mobile networks led to ubiquitous and pervasive computing. Existing query evaluation and optimization techniques for distributed databases using global schemas and cost models are no longer relevant. Query service, the key element allowing users to access data, must adapt itself to frequent changes in pervasive environments (application...
The introduction of advanced radio resource management features such as directional antennas, power control and variable data rates have been proposed to increase the performance of multihop wireless networks. In this paper we will study the combined effects of adaptive rate selection and power control in spatial time division multiple access (STDMA) networks where nodes are equipped with advanced...
In some areas, overlapping networks provide alternative wireless links like WLAN, GSM, 3G etc. Ideally, the user should be connected to the most attractive network any time according to predefined priorities. This is accomplished with automatic handover. The most likely commercial application of this type is designed for speech, and is using SIP to set up VoIP calls through WLAN networks or mobile...
Dedicated short range communications (DSRC) enable novel automotive safety applications such as an extended electronic brake light (EEBL) or intersection collision avoidance (ICA). These applications require reliable wireless communications even in scenarios with very high vehicle density, where these networks are primarily interference-limited. Given the uncertainties associated with current simulation...
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