Titlebook: Information Networking. Towards Ubiquitous Networking and Services; International Confer Teresa Vazão,Mário M. Freire,Ilyoung Chong Confere

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Scheduled Uplink Packet Transmission Schemes for Voice Traffic in OFDMA-Based Wireless CommunicationBased on voice traffic model analysis, four types of uplink packet scheduling algorithms, BUS, G-PUS, PUS-PLF and PUS-AMC, were proposed. From simulation results, it was verified that the PUS-AMC algorithm can increase channel capacity up to about 5.7 times compared to other algorithms. Superior per

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De-triangulation Optimal Solutions for Mobility Scenarios with Asymmetric Linksbasic connectivity. In order to reduce the maximum end-to-end delay of the packets, such triangulations can be later removed to enable direct routing of the data packets. However, using a simple update of this routing entry can cause the reception of out-of-order packets at the mobile node receiver,

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Effects of the Number of Hops on TCP Performance in Multi-hop Cellular Systemsistance and can make channel quality at each hop better. However it needs channel resources at every hop for packet transmission, and thus effective throughput on end-to-end links can be decreased. Related researches have shown that multi-hop transmission may reduce TCP performance in the systems. H

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Traffic-Aware MAC Protocol Using Adaptive Duty Cycle for Wireless Sensor Networksations such as surveillance, fire detection, and object-tracking system. This paper proposes a traffic-aware MAC protocol which dynamically adjusts the duty cycle adapting to the traffic load. Our adaptive scheme operates on a tree topology, and nodes wake up only for the time measured for the succe

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