The Experts below are selected from a list of 37581 Experts worldwide ranked by ideXlab platform
Mario Gerla - One of the best experts on this subject based on the ideXlab platform.
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dots a Propagation Delay awareopportunistic mac protocol for mobileunderwater networks
IEEE Transactions on Mobile Computing, 2014Co-Authors: Youngtae Noh, Uichin Lee, Seongwon Han, P K C Wang, Dustin Torres, Jinwhan Kim, Mario GerlaAbstract:Mobile underwater networks with acoustic communications are confronted with several unique challenges such as long Propagation Delays, high transmission power consumption, and node mobility. In particular, slow signal Propagation permits multiple packets to concurrently travel in the underwater channel, which must be exploited to improve the overall throughput. To this end, we propose the Delay-aware opportunistic transmission scheduling (DOTS) protocol that uses passively obtained local information (i.e., neighboring nodes' Propagation Delay map and their expected transmission schedules) to increase the chances of concurrent transmissions while reducing the likelihood of collisions. Our extensive simulation results document that DOTS outperforms existing solutions and provides fair medium access even with node mobility.
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dots a Propagation Delay aware opportunistic mac protocol for underwater sensor networks
International Conference on Network Protocols, 2010Co-Authors: Youngtae Noh, Uichin Lee, P K C Wang, Dustin Torres, Mario GerlaAbstract:Underwater Acoustic Sensor Networks (UW-ASNs) use acoustic links as a means of communications and are accordingly confronted with long Propagation Delays, low bandwidth, and high transmission power consumption. This unique situation, however, permits multiple packets to concurrently propagate in the underwater channel, which must be exploited in order to improve the overall throughput. To this end, we propose the Delay-aware Opportunistic Transmission Scheduling (DOTS) algorithm that uses passively obtained local information (i.e., neighboring nodes' Propagation Delay map and their expected transmission schedules) to increase the chances of concurrent transmissions while reducing the likelihood of collisions. Our extensive simulation results document that DOTS outperforms existing solutions and provides fair medium access.
Michael J Ryan - One of the best experts on this subject based on the ideXlab platform.
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design of a Propagation Delay tolerant mac protocol for underwater acoustic sensor networks
IEEE Journal of Oceanic Engineering, 2009Co-Authors: Xiaoxing Guo, M R Frater, Michael J RyanAbstract:Underwater acoustic sensor networks (UASNs) can be employed in a vast range of applications, retrieving accurate and up-to-date information from underneath the ocean's surface. Although widely used by terrestrial sensor networks, radio frequencies (RFs) do not propagate well underwater. Therefore, acoustic channels are employed as an alternative to support long-distance and low-power communication in underwater sensor networks even though acoustic signals suffer from long Propagation Delay and have very limited bandwidth. In this paper, we introduce an adaptive Propagation-Delay-tolerant collision-avoidance protocol (APCAP) for the media access control (MAC) sublayer of UASN. The protocol includes an improved handshaking mechanism that improves efficiency and throughput in UASN where there is a large Propagation Delay. The mechanism guarantees nodes that can potentially interfere with a forthcoming transmission are properly informed. It also allows a node to utilize its idle time while waiting for messages to propagate, which is otherwise wasted by most existing MAC protocols. The simulation results indicate that where employed by UASN, APCAP exhibits good performance and outperforms the other MAC protocols examined in this paper.
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an adaptive Propagation Delay tolerant mac protocol for underwater acoustic sensor networks
OCEANS 2007 - Europe, 2007Co-Authors: Xiaoxing Guo, M R Frater, Michael J RyanAbstract:To support the retrieval of accurate and up-to-date information from beneath the world's oceans, it is desirable to deploy underwater sensor networks. However, since radio frequencies (RF) do not propagate well underwater, acoustic channels are employed to support long-distance and low-power communication in underwater sensor networks even though acoustic signals suffer from long Propagation Delay and have very limited bandwidth. In this paper, we first show the limitation of conventional MAC protocols in the proposed environment; and introduce a new MAC protocol: the adaptive Propagation-Delay-tolerant collision-avoidance protocol (APCAP). We demonstrate that, in channels with long Propagation Delay, APCAP significantly outperforms those MAC protocols that are devised for RF-based networks.
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a Propagation Delay tolerant collision avoidance protocol for underwater acoustic sensor networks
OCEANS 2006 - Asia Pacific, 2006Co-Authors: Xiaoxing Guo, M R Frater, Michael J RyanAbstract:Underwater acoustic sensor networks can be employed by a vast range of applications, retrieving accurate and up-to-date information from underneath the water surface. Although widely used by radios in terrestrial sensor networks, radio frequencies do not propagate well underwater. Acoustic channels are therefore employed as an alternative to support long-distance and low-power communication underwater, even though such channels suffer from long Propagation Delay and very limited bandwidth. In this paper, we investigate the impact of the large Propagation Delay on the throughput of selected classical MAC protocols and their variants, and show that protocols need to be revised to accommodate large Propagation Delay in order to achieve good throughput. We then introduce a Propagation-Delay-tolerant collision avoidance protocol named PCAP and show that by taking into account the Propagation Delay, PCAP offers higher throughput than the protocols that are widely used by conventional wireless communication networks.
Youngtae Noh - One of the best experts on this subject based on the ideXlab platform.
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dots a Propagation Delay awareopportunistic mac protocol for mobileunderwater networks
IEEE Transactions on Mobile Computing, 2014Co-Authors: Youngtae Noh, Uichin Lee, Seongwon Han, P K C Wang, Dustin Torres, Jinwhan Kim, Mario GerlaAbstract:Mobile underwater networks with acoustic communications are confronted with several unique challenges such as long Propagation Delays, high transmission power consumption, and node mobility. In particular, slow signal Propagation permits multiple packets to concurrently travel in the underwater channel, which must be exploited to improve the overall throughput. To this end, we propose the Delay-aware opportunistic transmission scheduling (DOTS) protocol that uses passively obtained local information (i.e., neighboring nodes' Propagation Delay map and their expected transmission schedules) to increase the chances of concurrent transmissions while reducing the likelihood of collisions. Our extensive simulation results document that DOTS outperforms existing solutions and provides fair medium access even with node mobility.
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dots a Propagation Delay aware opportunistic mac protocol for underwater sensor networks
International Conference on Network Protocols, 2010Co-Authors: Youngtae Noh, Uichin Lee, P K C Wang, Dustin Torres, Mario GerlaAbstract:Underwater Acoustic Sensor Networks (UW-ASNs) use acoustic links as a means of communications and are accordingly confronted with long Propagation Delays, low bandwidth, and high transmission power consumption. This unique situation, however, permits multiple packets to concurrently propagate in the underwater channel, which must be exploited in order to improve the overall throughput. To this end, we propose the Delay-aware Opportunistic Transmission Scheduling (DOTS) algorithm that uses passively obtained local information (i.e., neighboring nodes' Propagation Delay map and their expected transmission schedules) to increase the chances of concurrent transmissions while reducing the likelihood of collisions. Our extensive simulation results document that DOTS outperforms existing solutions and provides fair medium access.
Gilson Inacio Wirth - One of the best experts on this subject based on the ideXlab platform.
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tid in flash based fpga power supply current rise and logic function mapping effects in Propagation Delay degradation
IEEE Transactions on Nuclear Science, 2011Co-Authors: Fernanda Lima Kastensmidt, E C P Fonseca, Odair Lelis Goncalez, Raul Chipana, Gilson Inacio WirthAbstract:We exposed a flash-based FPGA to radiation to measure variations in current, temperature, Propagation-Delay and duty-cycle in logic circuits. Propagation-Delay degradations vary from 400% to 1100% before functional failure, according to circuit and logical mapping. Electrical simulations are carried out to study the difference of behavior in the degradation of different logic mappings.
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tid in flash based fpga power supply current rise and logic function mapping effects in Propagation Delay degradation
IEEE Transactions on Nuclear Science, 2011Co-Authors: Fernanda Lima Kastensmidt, E C P Fonseca, Odair Lelis Goncalez, Raul Chipana, Rafael Galhardo Vaz, Gilson Inacio WirthAbstract:We exposed a flash-based FPGA to radiation to measure variations in current, temperature, Propagation-Delay and duty-cycle in logic circuits. Propagation-Delay degradations vary from 400% to 1100% before functional failure, according to circuit and logical mapping. Electrical simulations are carried out to study the difference of behavior in the degradation of different logic mappings.
Xiaoxing Guo - One of the best experts on this subject based on the ideXlab platform.
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design of a Propagation Delay tolerant mac protocol for underwater acoustic sensor networks
IEEE Journal of Oceanic Engineering, 2009Co-Authors: Xiaoxing Guo, M R Frater, Michael J RyanAbstract:Underwater acoustic sensor networks (UASNs) can be employed in a vast range of applications, retrieving accurate and up-to-date information from underneath the ocean's surface. Although widely used by terrestrial sensor networks, radio frequencies (RFs) do not propagate well underwater. Therefore, acoustic channels are employed as an alternative to support long-distance and low-power communication in underwater sensor networks even though acoustic signals suffer from long Propagation Delay and have very limited bandwidth. In this paper, we introduce an adaptive Propagation-Delay-tolerant collision-avoidance protocol (APCAP) for the media access control (MAC) sublayer of UASN. The protocol includes an improved handshaking mechanism that improves efficiency and throughput in UASN where there is a large Propagation Delay. The mechanism guarantees nodes that can potentially interfere with a forthcoming transmission are properly informed. It also allows a node to utilize its idle time while waiting for messages to propagate, which is otherwise wasted by most existing MAC protocols. The simulation results indicate that where employed by UASN, APCAP exhibits good performance and outperforms the other MAC protocols examined in this paper.
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an adaptive Propagation Delay tolerant mac protocol for underwater acoustic sensor networks
OCEANS 2007 - Europe, 2007Co-Authors: Xiaoxing Guo, M R Frater, Michael J RyanAbstract:To support the retrieval of accurate and up-to-date information from beneath the world's oceans, it is desirable to deploy underwater sensor networks. However, since radio frequencies (RF) do not propagate well underwater, acoustic channels are employed to support long-distance and low-power communication in underwater sensor networks even though acoustic signals suffer from long Propagation Delay and have very limited bandwidth. In this paper, we first show the limitation of conventional MAC protocols in the proposed environment; and introduce a new MAC protocol: the adaptive Propagation-Delay-tolerant collision-avoidance protocol (APCAP). We demonstrate that, in channels with long Propagation Delay, APCAP significantly outperforms those MAC protocols that are devised for RF-based networks.
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a Propagation Delay tolerant collision avoidance protocol for underwater acoustic sensor networks
OCEANS 2006 - Asia Pacific, 2006Co-Authors: Xiaoxing Guo, M R Frater, Michael J RyanAbstract:Underwater acoustic sensor networks can be employed by a vast range of applications, retrieving accurate and up-to-date information from underneath the water surface. Although widely used by radios in terrestrial sensor networks, radio frequencies do not propagate well underwater. Acoustic channels are therefore employed as an alternative to support long-distance and low-power communication underwater, even though such channels suffer from long Propagation Delay and very limited bandwidth. In this paper, we investigate the impact of the large Propagation Delay on the throughput of selected classical MAC protocols and their variants, and show that protocols need to be revised to accommodate large Propagation Delay in order to achieve good throughput. We then introduce a Propagation-Delay-tolerant collision avoidance protocol named PCAP and show that by taking into account the Propagation Delay, PCAP offers higher throughput than the protocols that are widely used by conventional wireless communication networks.
