Results 1 - 10 of 16

Opportunistic Media Access for Multirate Ad Hoc Networks

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly , 2002
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 332 (12 self) - Add to MetaCart
the channel conditions. In this paper, we introduce the Opportunistic Auto Rate (OAR) protocol to better exploit durations of high-quality channels conditions. The key mechanism of the OAR protocol is to opportunistically send multiple back-to-back data packets whenever the channel quality is good. As channel

OAR: An Opportunistic Auto-rate Media Access

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly - ACM Mobicom , 2005
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 40 (1 self) - Add to MetaCart
the channel conditions. In this paper, we introduce the Opportunistic Auto Rate (OAR) protocol to better exploit durations of high-quality channels conditions. The key mechanism of the OAR protocol is to opportunistically send multiple back-to-back data packets whenever the channel quality is good. As channel

A Congestion-aware Medium Access Control Protocol for Multi-rate Ad-hoc Networks

by Timo Zauner, Luke Haslett
"... This paper investigates the problem of how to improve TCP performance in multi-rate Ad-hoc networks with congested links. To improve network performance, different rate adaptation algorithms, such as Automatic Rate Fallback (ARF) and Receiver-Based AutoRate (RBAR), have been proposed to adapt the da ..."
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the data rate according to the current channel quality. Opportunistic Auto Rate (OAR) protocol is an optimisation for any existing rate adaptation algorithm which leads to a significant performance gain by providing temporal fairness. We analyze the reasons for the high performance gain obtained using OAR

Opportunistic spectral usage: Bounds and a multi-band CSMA/CA protocol

by Ashutosh Sabharwal, Ahmad Khoshnevis, Edward Knightly - IEEE/ACM Transactions on Networking , 2006
"... Abstract — In this paper, we study the gains from opportunistic spectrum usage when neither sender or receiver are aware of the current channel conditions in different frequency bands. Hence to select the best band for sending data, nodes first need to measure the channel in different bands which ta ..."
Abstract - Cited by 63 (1 self) - Add to MetaCart
the proposed skipping rule on a per node pair basis. The proposed protocol exploits both time and frequency diversity, and is shown to result in typical throughput gains of 20% or more over a protocol which only exploits time diversity, Opportunistic Auto Rate (OAR). I.

Open Access JCT Predictability and Management of OARs Toxicity in Patients with Prostate Cancer Treated with High-Dose

by Vincenzo Ravo, Domenico Borrelli, Sara Falivene, Rossella Di Franco, Matteo Muto, Angela Argenone, Valentina Borzillo, Fabrizio Cammarota, Paolo Muto
"... Copyright © 2013 Vincenzo Ravo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In accor-dance of the Creative Commons Attribut ..."
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toxicity had “borderline ” DVHs. Conclusion: Our analysis led to the establishment of a protocol for the management of patients with “border-line ” DVH.

ABSTRACT Opportunistic Media Access for Multirate

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
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the channel conditions. In this paper, we introduce the Opportunistic Auto Rate (OAR) protocol to better exploit durations of high-quality channels conditions. The key mechanism of the OAR protocol is to opportunistically send multiple back-to-back data packets whenever the channel quality is good. As channel

QOAR: Adaptive QoS Scheme in Multi-rate Wireless

by Ming Li, Yang Xiao, Hua Zhu, Imrich Chlamtac, B. Prabhakaran
"... Abstract—With the availability of multiple rates in IEEE 802.11a/b/g wireless LANs, it is desirable to improve the network capacity and temporal fairness by sending multiple consecutive frames over high rate links, as proposed in opportunistic auto rate (OAR [1]). However, the basic OAR does not pro ..."
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not provide quality of service (QoS) guarantee and thus is not sufficient in supporting real time voice/video traffic. In this paper, we further enhance the OAR protocol with a set of QoS mechanisms. The proposed QOAR protocol consists of two protocols: (i) a traffic-differentiating flow weight adaptation

ANALYSIS ON COGNITIVE WIRELESS NETWORK MAC PROTOCOL ACCESS MODE BASED ON NS2

by Haibo Gao, Wenjuan Zeng
"... Aiming at the same frequency interference, in the channel increased frequency recognition function before the consultation and put forward based on the frequency of perception multiple channel CC-MMAC agreement, simulation verification protocol can effectively reduce the co-channel interference. Cha ..."
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adaptation leave C protocol, put forward based on the chance rate adaptive OAR DCA channel protocol can improve the network throughput effectively. In the study of multipath routing protocol based on AODV introduce next hop routing layer thought to the MAC layer and proposed the establishment of a plurality

Evaluation of the Dosimetric Feasibility of Hippocampal Sparing Intensity-Modulated Radiotherapy in Patients with Locally Advanced Nasopharyngeal Carcinoma

by Guang Han, Dong Liu, Hua Gan, Kyle A. Denniston, Sicong Li, Wenyong Tan, Desheng Hu , 2014
"... Purpose: The objective of this study was to evaluate the dosimetric feasibility of using hippocampus (HPC) sparing intensity-modulated radiotherapy (IMRT) in patients with locally advanced nasopharyngeal carcinoma (NPC). Materials/Methods: Eight cases of either T3 or T4 NPC were selected for this st ..."
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for this study. Standard IMRT treatment plans were constructed using the volume and dose constraints for the targets and organs at risk (OAR) per Radiation Therapy Oncology Group (RTOG) 0615 protocol. Experimental plans were constructed using the same criteria, with the addition of the HPC as an OAR. The two

doi:10.1155/2012/329214 Research Article (Radio)Biological Optimization of External-Beam Radiotherapy

by Alan E. Nahum, Julien Uzan , 2012
"... License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. “Biological optimization ” (BIOP) means planning treatments using (radio)biological criteria and models, that is, tumour control probability and normal-tissue complica ..."
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regions of the DVH, for example, penalising high doses for quasi-serial OARs such as rectum. Level-IV BIOP adds functional imaging information, for example, hypoxia or clonogen location, to Level III; examples are given of our prostate “dose painting ” protocol, BioProp. The limitations
Results 1 - 10 of 16