The Experts below are selected from a list of 3381 Experts worldwide ranked by ideXlab platform

J J Garcialunaaceves - One of the best experts on this subject based on the ideXlab platform.

  • improving tcp performance over wireless networks at the link layer
    Mobile Networks and Applications, 2000
    Co-Authors: C Parsa, J J Garcialunaaceves
    Abstract:

    We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a Maximum Propagation Delay over the link, rather than performing a round-trip time estimate of the channel Delay. The protocol does not require a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput, i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP achieves higher throughput, lower packet Delay, and smaller Delay variance.

  • tulip a link level protocol for improving tcp over wireless links
    Wireless Communications and Networking Conference, 1999
    Co-Authors: C Parsa, J J Garcialunaaceves
    Abstract:

    We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a Maximum Propagation Delay over the link, rather than performing a round-trip time estimate of the channel Delay. The protocol does not require a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput, i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP achieves higher throughput, lower packet Delay, and smaller Delay variance.

C Parsa - One of the best experts on this subject based on the ideXlab platform.

  • Improving TCP performance over wireless networks at the link layer
    Mobile Networks and Applications, 2004
    Co-Authors: C Parsa, J.j. Garcia‐luna‐aceves
    Abstract:

    We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a Maximum Propagation Delay over the link, rather than performing a round-trip time estimate of the channel Delay. The protocol does not require a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput, i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP achieves higher throughput, lower packet Delay, and smaller Delay variance.

  • improving tcp performance over wireless networks at the link layer
    Mobile Networks and Applications, 2000
    Co-Authors: C Parsa, J J Garcialunaaceves
    Abstract:

    We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a Maximum Propagation Delay over the link, rather than performing a round-trip time estimate of the channel Delay. The protocol does not require a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput, i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP achieves higher throughput, lower packet Delay, and smaller Delay variance.

  • tulip a link level protocol for improving tcp over wireless links
    Wireless Communications and Networking Conference, 1999
    Co-Authors: C Parsa, J J Garcialunaaceves
    Abstract:

    We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a Maximum Propagation Delay over the link, rather than performing a round-trip time estimate of the channel Delay. The protocol does not require a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput, i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP achieves higher throughput, lower packet Delay, and smaller Delay variance.

J.j. Garcia‐luna‐aceves - One of the best experts on this subject based on the ideXlab platform.

  • Improving TCP performance over wireless networks at the link layer
    Mobile Networks and Applications, 2004
    Co-Authors: C Parsa, J.j. Garcia‐luna‐aceves
    Abstract:

    We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a Maximum Propagation Delay over the link, rather than performing a round-trip time estimate of the channel Delay. The protocol does not require a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput, i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP achieves higher throughput, lower packet Delay, and smaller Delay variance.

John Heidemann - One of the best experts on this subject based on the ideXlab platform.

  • design and analysis of a Propagation Delay tolerant aloha protocol for underwater networks
    Ad Hoc Networks, 2011
    Co-Authors: Joon Ahn, Affan A Syed, Bhaskar Krishnamachari, John Heidemann
    Abstract:

    Acoustic underwater wireless sensor networks (UWSN) have recently gained attention as a topic of research. Such networks are characterized by increased uncertainty in medium access due not only to when data is sent, but also due to significantly different Propagation latencies from spatially diverse transmitters-together, we call these space-time uncertainty. We find that the throughput of slotted ALOHA degrades to pure ALOHA in such an environment with varying Delay. We therefore propose handling this spatial uncertainty by adding guard times to slotted ALOHA, forming Propagation Delay Tolerant (PDT-)ALOHA. We show that PDT-ALOHA increases throughput by 17-100% compared to simple slotted ALOHA in underwater settings. We analyze the protocol's performance both mathematically and via extensive simulations. We find that the throughput capacity decreases as the Maximum Propagation Delay increases, and identify protocol parameter values that realize optimal throughput. Our results suggest that shorter hops improve throughput in UWSNs.

Joon Ahn - One of the best experts on this subject based on the ideXlab platform.

  • design and analysis of a Propagation Delay tolerant aloha protocol for underwater networks
    Ad Hoc Networks, 2011
    Co-Authors: Joon Ahn, Affan A Syed, Bhaskar Krishnamachari, John Heidemann
    Abstract:

    Acoustic underwater wireless sensor networks (UWSN) have recently gained attention as a topic of research. Such networks are characterized by increased uncertainty in medium access due not only to when data is sent, but also due to significantly different Propagation latencies from spatially diverse transmitters-together, we call these space-time uncertainty. We find that the throughput of slotted ALOHA degrades to pure ALOHA in such an environment with varying Delay. We therefore propose handling this spatial uncertainty by adding guard times to slotted ALOHA, forming Propagation Delay Tolerant (PDT-)ALOHA. We show that PDT-ALOHA increases throughput by 17-100% compared to simple slotted ALOHA in underwater settings. We analyze the protocol's performance both mathematically and via extensive simulations. We find that the throughput capacity decreases as the Maximum Propagation Delay increases, and identify protocol parameter values that realize optimal throughput. Our results suggest that shorter hops improve throughput in UWSNs.