The Experts below are selected from a list of 654 Experts worldwide ranked by ideXlab platform

Jon W. Mark - One of the best experts on this subject based on the ideXlab platform.

  • Robust Cross-layer Design of Wireless Profiled TCP Mobile Receiver for Vertical Handover
    2008
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark, Student Member, Senior Member, Life Fellow
    Abstract:

    Abstract—In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks, and address Wireless Profiled TCP (WP-TCP) premature timeouts due to step increase of round-trip time and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the Wireless Application Protocol version 2 (WAP 2.0) architecture, and robust in the absence of perfect cross-layer information. We propose two proactive schemes called RTT Inflation and RTT Equalization. The RTT Inflation scheme suppresses premature timeouts by carefully inflating retransmission timeout time and the RTT Equalization scheme prevents false Fast Retransmit by equalizing the round-trip delay experienced by all packets. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions. Index Terms — Cross-layer design, wireless profiled TCP, vertical handover, integrated wireless networks

  • ICC - Cross-layer Design and Analysis of Wireless Profiled TCP for Vertical Handover
    2007 IEEE International Conference on Communications, 2007
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark
    Abstract:

    In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks, and address wireless profiled TCP premature timeouts due to steep increase of round-trip time and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the wireless application protocol version 2 (WAP 2.0) architecture, and robust in the absence of cross-layer information. We propose two proactive schemes which prevent false Fast Retransmit by equalizing the round-trip delay experienced by all packets and suppress the premature timeouts by carefully inflating retransmission timeout time. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions.

  • Robust Cross-Layer Design of Wireless-Profiled TCP Mobile Receiver for Vertical Handover
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark
    Abstract:

    In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks and address wireless-profiled Transmission Control Protocol premature timeouts due to step increase of round-trip time (RTT) and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile-receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the Wireless Application Protocol version 2 architecture, and robust in the absence of perfect cross-layer information. We propose two proactive schemes, called RTT Inflation and RTT Equalization. The RTT Inflation scheme suppresses premature timeouts by carefully inflating retransmission timeout time, and the RTT Equalization scheme prevents false Fast Retransmit by equalizing the round-trip delay experienced by all packets. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions.

Jarmo Harju - One of the best experts on this subject based on the ideXlab platform.

  • The PFTK-model revised
    Computer Communications, 2006
    Co-Authors: Roman Dunaytsev, Yevgeni Koucheryavy, Jarmo Harju
    Abstract:

    This paper presents an analytical model of TCP Reno throughput as a function of loss event rate, average round trip time, average retransmission timeout value, and receiver window size based on the model proposed by Padhye et al. (widely known as the PFTK-model in correspondence with the initials of the authors). The presented model refines previous work by careful examination of Fast Retransmit/Fast recovery dynamics in the presence of correlated losses and taking into consideration slow start phase after timeout. The accuracy of the proposed model is validated against simulation results and compared with those of the PFTK-model. Simulation results show that the model gives a more accurate estimation of TCP Reno throughput in the presence of correlated losses than the PFTK-model.

  • WWIC - Refined PFTK-Model of TCP reno throughput in the presence of correlated losses
    Lecture Notes in Computer Science, 2005
    Co-Authors: Roman Dunaytsev, Yevgeni Koucheryavy, Jarmo Harju
    Abstract:

    This paper presents a simple and accurate analytical model of TCP Reno throughput as a function of loss rate, average round trip time and receiver window size based on PFTK-model. The presented model refines previous work by careful examination of Fast Retransmit/Fast recovery dynamics in the presence of correlated losses and taking into consideration slow start phase after timeout. The accuracy of the proposed model is validated against simulation results and compared with those of PFTK-model. Simulation results show that our model gives a more accurate estimation of TCP Reno throughput in the presence of correlated losses than PFTK-model.

  • Refined PFTK-model of TCP reno throughput in the presence of correlated losses
    Lecture Notes in Computer Science, 2005
    Co-Authors: Roman Dunaytsev, Yevgeni Koucheryavy, Jarmo Harju
    Abstract:

    This paper presents a simple and accurate analytical model of TCP Reno throughput as a function of loss rate, average round trip time and receiver window size based on PFTK-model. The presented model refines previous work by careful examination of Fast Retransmit/Fast recovery dynamics in the presence of correlated losses and taking into consideration slow start phase after timeout. The accuracy of the proposed model is validated against simulation results and compared with those of PFTK-model. Simulation results show that our model gives a more accurate estimation of TCP Reno throughput in the presence of correlated losses than PFTK-model.

Humphrey Rutagemwa - One of the best experts on this subject based on the ideXlab platform.

  • Robust Cross-layer Design of Wireless Profiled TCP Mobile Receiver for Vertical Handover
    2008
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark, Student Member, Senior Member, Life Fellow
    Abstract:

    Abstract—In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks, and address Wireless Profiled TCP (WP-TCP) premature timeouts due to step increase of round-trip time and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the Wireless Application Protocol version 2 (WAP 2.0) architecture, and robust in the absence of perfect cross-layer information. We propose two proactive schemes called RTT Inflation and RTT Equalization. The RTT Inflation scheme suppresses premature timeouts by carefully inflating retransmission timeout time and the RTT Equalization scheme prevents false Fast Retransmit by equalizing the round-trip delay experienced by all packets. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions. Index Terms — Cross-layer design, wireless profiled TCP, vertical handover, integrated wireless networks

  • ICC - Cross-layer Design and Analysis of Wireless Profiled TCP for Vertical Handover
    2007 IEEE International Conference on Communications, 2007
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark
    Abstract:

    In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks, and address wireless profiled TCP premature timeouts due to steep increase of round-trip time and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the wireless application protocol version 2 (WAP 2.0) architecture, and robust in the absence of cross-layer information. We propose two proactive schemes which prevent false Fast Retransmit by equalizing the round-trip delay experienced by all packets and suppress the premature timeouts by carefully inflating retransmission timeout time. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions.

  • Robust Cross-Layer Design of Wireless-Profiled TCP Mobile Receiver for Vertical Handover
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark
    Abstract:

    In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks and address wireless-profiled Transmission Control Protocol premature timeouts due to step increase of round-trip time (RTT) and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile-receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the Wireless Application Protocol version 2 architecture, and robust in the absence of perfect cross-layer information. We propose two proactive schemes, called RTT Inflation and RTT Equalization. The RTT Inflation scheme suppresses premature timeouts by carefully inflating retransmission timeout time, and the RTT Equalization scheme prevents false Fast Retransmit by equalizing the round-trip delay experienced by all packets. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions.

Roman Dunaytsev - One of the best experts on this subject based on the ideXlab platform.

  • The PFTK-model revised
    Computer Communications, 2006
    Co-Authors: Roman Dunaytsev, Yevgeni Koucheryavy, Jarmo Harju
    Abstract:

    This paper presents an analytical model of TCP Reno throughput as a function of loss event rate, average round trip time, average retransmission timeout value, and receiver window size based on the model proposed by Padhye et al. (widely known as the PFTK-model in correspondence with the initials of the authors). The presented model refines previous work by careful examination of Fast Retransmit/Fast recovery dynamics in the presence of correlated losses and taking into consideration slow start phase after timeout. The accuracy of the proposed model is validated against simulation results and compared with those of the PFTK-model. Simulation results show that the model gives a more accurate estimation of TCP Reno throughput in the presence of correlated losses than the PFTK-model.

  • WWIC - Refined PFTK-Model of TCP reno throughput in the presence of correlated losses
    Lecture Notes in Computer Science, 2005
    Co-Authors: Roman Dunaytsev, Yevgeni Koucheryavy, Jarmo Harju
    Abstract:

    This paper presents a simple and accurate analytical model of TCP Reno throughput as a function of loss rate, average round trip time and receiver window size based on PFTK-model. The presented model refines previous work by careful examination of Fast Retransmit/Fast recovery dynamics in the presence of correlated losses and taking into consideration slow start phase after timeout. The accuracy of the proposed model is validated against simulation results and compared with those of PFTK-model. Simulation results show that our model gives a more accurate estimation of TCP Reno throughput in the presence of correlated losses than PFTK-model.

  • Refined PFTK-model of TCP reno throughput in the presence of correlated losses
    Lecture Notes in Computer Science, 2005
    Co-Authors: Roman Dunaytsev, Yevgeni Koucheryavy, Jarmo Harju
    Abstract:

    This paper presents a simple and accurate analytical model of TCP Reno throughput as a function of loss rate, average round trip time and receiver window size based on PFTK-model. The presented model refines previous work by careful examination of Fast Retransmit/Fast recovery dynamics in the presence of correlated losses and taking into consideration slow start phase after timeout. The accuracy of the proposed model is validated against simulation results and compared with those of PFTK-model. Simulation results show that our model gives a more accurate estimation of TCP Reno throughput in the presence of correlated losses than PFTK-model.

Sangheon Pack - One of the best experts on this subject based on the ideXlab platform.

  • Robust Cross-layer Design of Wireless Profiled TCP Mobile Receiver for Vertical Handover
    2008
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark, Student Member, Senior Member, Life Fellow
    Abstract:

    Abstract—In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks, and address Wireless Profiled TCP (WP-TCP) premature timeouts due to step increase of round-trip time and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the Wireless Application Protocol version 2 (WAP 2.0) architecture, and robust in the absence of perfect cross-layer information. We propose two proactive schemes called RTT Inflation and RTT Equalization. The RTT Inflation scheme suppresses premature timeouts by carefully inflating retransmission timeout time and the RTT Equalization scheme prevents false Fast Retransmit by equalizing the round-trip delay experienced by all packets. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions. Index Terms — Cross-layer design, wireless profiled TCP, vertical handover, integrated wireless networks

  • ICC - Cross-layer Design and Analysis of Wireless Profiled TCP for Vertical Handover
    2007 IEEE International Conference on Communications, 2007
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark
    Abstract:

    In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks, and address wireless profiled TCP premature timeouts due to steep increase of round-trip time and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the wireless application protocol version 2 (WAP 2.0) architecture, and robust in the absence of cross-layer information. We propose two proactive schemes which prevent false Fast Retransmit by equalizing the round-trip delay experienced by all packets and suppress the premature timeouts by carefully inflating retransmission timeout time. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions.

  • Robust Cross-Layer Design of Wireless-Profiled TCP Mobile Receiver for Vertical Handover
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Humphrey Rutagemwa, Sangheon Pack, Xuemin Shen, Jon W. Mark
    Abstract:

    In this paper, we consider downward and upward vertical handovers in integrated wireless LAN and cellular networks and address wireless-profiled Transmission Control Protocol premature timeouts due to step increase of round-trip time (RTT) and false Fast Retransmit due to packet reordering. Specifically, we develop a mobile-receiver centric loosely coupled cross-layer design, which is easy to implement and deploy, backward compatible with the Wireless Application Protocol version 2 architecture, and robust in the absence of perfect cross-layer information. We propose two proactive schemes, called RTT Inflation and RTT Equalization. The RTT Inflation scheme suppresses premature timeouts by carefully inflating retransmission timeout time, and the RTT Equalization scheme prevents false Fast Retransmit by equalizing the round-trip delay experienced by all packets. We conduct extensive simulations to evaluate the performance in downward and upward vertical handovers. It is demonstrated that the proposed schemes significantly improve the performance in a wide range of network conditions.