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End-to-end delay is an important QoS parameter in wireless sensor networks. The term end-to-end delay is the total amount of time taken for transmission of data to reach the destination. The parameter which causes end-to-end time delay in the wireless sensor network includes length of the path i.e. the number of repeaters and the congestion along the route. In this paper, main focus is end-to-end...
Network coding (NC) has been shown to improve the throughput of multi-hop wireless networks (MWN). Prior work on performance modeling of NC mainly addresses the maximization of throughput. However, these works fail to capture the complete picture since there may be paths in the network for which end-to-end packet delay is prohibitively high. In this paper, we address the problem of delay minimization...
There is little understanding about how network applications can benefit from mathematical/heuristic optimization techniques, such as cross-layer design. We propose CLASS, a component-based framework for evaluating and comparing network optimization techniques, such as cross-layer design. CLASS uniquely integrates network optimization with high-fidelity simulation to provide an “optimize-and-verify”...
In this paper we devise efficient optimization techniques to find optimal routing and scheduling policies for wireless ad hoc networks in the presence of multi-user interference and cooperative transmissions. Our focus is to assess the impact of interference among distinct data flows on optimal routing paths and related transmission schedules. In our reference scenario, all nodes have a single antenna...
Wireless ad hoc networks are seldom characterized by one single performance metric, yet the current literature lacks a flexible framework to assist in characterizing the design tradeoffs in such networks. The aim of this paper is not to propose another routing strategy. Instead, we address this problem by proposing a new modeling framework for routing in ad hoc networks, which will result in a better...
Multi-radio, multi-channel wireless mesh networking is an emerging wireless technology which enables the use of multiple radios in each wireless mesh router. Each radio is assigned to a particular channel based on a channel assignment algorithm in order to solve some objective function, e.g., maximizing network throughput or minimizing wireless interference. Multicast is a form of communication that...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
In classical routing strategies for multihop mobile wireless networks packets are routed on a pre-defined route usually obtained by a shortest path routing protocol. In opportunistic routing schemes, for each packet and each hop, the next relay is found by dynamically selecting the node that captures the packet transmission and which is the nearest to the destination. Such a scheme allows each packet...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
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