The internal link loss characteristic inference has become an increasingly important issue for operating and evaluating a wireless sensor network. Due to the inherent stringent bandwidth and energy constraints of sens...
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The internal link loss characteristic inference has become an increasingly important issue for operating and evaluating a wireless sensor network. Due to the inherent stringent bandwidth and energy constraints of sensors, it is usually impractical to directly monitor each node or link in wireless sensor network. We consider the problem of inferring the internal link loss characteristics from passive end-to-end measurement in this paper. Specifically, the link loss performance inference during the data aggregation is considered. Under the assumptions that the link losses are mutually independent, we elaborate a bias corrected link loss Cumulant Generating Function (CGF) algorithm. The simulation results show that the internal link loss CGF can be inferred accurately comparable to the sampled internal link loss CGF. At the end of this paper, we apply the result of internal link loss CGF inference to identify the lossy link in sensor network.
Nowadays, blog has been playing a more and more important role in human life as the internet evolves dramatically. Academia has seen an research burst on blog since 2002, not only in the area of computer science like ...
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Nowadays, blog has been playing a more and more important role in human life as the internet evolves dramatically. Academia has seen an research burst on blog since 2002, not only in the area of computer science like IR and web mining, but also in the area of social sciences. We present a blog-centered framework here to abstract and generalize current researches on blog mining, with the intention of providing a clear image on blog-focused research area.
The link interference and multi-hop characters make Wireless Mesh Network (WMN) performance can not be tuned well by local information. We propose an analytical flow control scheme (AFCS) based on the optimal bandwidt...
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ISBN:
(纸本)9781595938190
The link interference and multi-hop characters make Wireless Mesh Network (WMN) performance can not be tuned well by local information. We propose an analytical flow control scheme (AFCS) based on the optimal bandwidth allocation model that is specifically designed for the unique characteristics of WMN. The original contribution incorporated in a flow contention model of WMN based on maximal link interference region. With the contention constraint, the optimality of bandwidth allocation can be achieved by maximizing the aggregated utility across all flows. We then deduce a practical equation for adjusting sending rate from the bandwidth allocation model. Based on the simplified analytical equation and the congestion notification message mechanism, we propose an equation-based flow control framework for real-time traffic in WMN. Simulation results have shown the AFCS can improve the capacity of the WMN by 40% and alleviate the unfairness and delay jitter greatly. The fast response, fairness and steadiness characters of the AFCS are helpful for rigorous real-time traffic and dynamic wireless network. Copyright 2007 ACM.
The paper proposes a throughput and energy-aware medium-access-control protocol for wireless sensor networks. The proposed approach provides a sleeping-time adjustment scheme to flexibly adjust the sleep time to reduc...
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The paper proposes a throughput and energy-aware medium-access-control protocol for wireless sensor networks. The proposed approach provides a sleeping-time adjustment scheme to flexibly adjust the sleep time to reduce the wasted energy in a low-traffic network and increase the throughput in a high-traffic network. The sleeping and waking durations are determined using time counters rather than time slots. A waking-time sharing scheme is responsible for establishing the common waking time among a group of neighbors for group communication. The proposed protocol solves the energy inefficiency caused by idle listening. Simulation experiments have been performed to demonstrate the effectiveness of the proposed approach compared to some other energy-aware medium-access-control protocols.
One of the research challenges for 4G-wireless systems is the design of mobility management techniques that integrate cellular and ad-hoc networks. Currently there are no structured mobility management schemes for the...
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One of the research challenges for 4G-wireless systems is the design of mobility management techniques that integrate cellular and ad-hoc networks. Currently there are no structured mobility management schemes for these heterogeneous multi-hop networks. In this paper we propose an adaptive protocol for mobility management in multi-hop heterogeneous networks (M/sup 3/HN) for seamless mobility in an integrated cellular and ad-hoc network. This paper describes techniques for tracking a mobile node in a multi-hop network with minimum overhead. Using M/sup 3/HN a node can migrate from a single-hop network to a multi-hop connectivity seamlessly. This scheme is independent of the routing protocol used in a multi-hop network.
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