End-to-End Adaptive Error Control for a Resilient and Disruption Tolerant Transport Protocol

While there has been an increase in the growth of networking technologies to suit the current demand of applications and users, networks are still susceptible to disruption. Communication networks operating in any domain come with inherent challenges that make end-to-end connections harder to maintain. This argument calls for protocols that are disruption tolerant and can offer resilience. Res-TP is a new transport protocol that directly addresses the challenges posed by challenged networks. It offers QoS (quality of service) and varying degrees of reliability depending on the class of data being communicated. Apart from a reliable-connection mode which offers full end-to-end reliability using ARQ (automatic repeat request), the protocol also includes quasi-reliable mode that offers statistical reliability by using end-to-end FEC (forward error correction) codes, unreliable-connection mode that does not implement either ARQ or FEC but relies on link-layer FEC, and unreliable datagram that transparently passes UDP traffic. While the fully-reliable connection mode offers closed-loop error control, the quasi-reliable mode offers open-loop error control. This leaves a gap within the spectrum to analyze the benefits of employing both closed-loop and open-loop error control. Hyrbid error control, with both FEC and ARQ, is a simple way to offer high end-to-end reliability and performance during moderate error conditions. In this thesis, the reliable-connection mode (ResTP-ARQ) along with hybrid error control mechanisms (ResTP-NACK and ResTP-NACK+MACK) are implemented. The protocols are simulated using ns-3 (network simulator-3) and are compared against the quasi-reliable mode to examine their tradeoffs. They are also compared against the traditional TCP and UDP protocols in an identical network scenario

Comparison of Adaptive Transport Layer Error-Control Mechanisms for Highly-Dynamic Airborne Telemetry Networks

ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, CaliforniaTransport protocols in highly-dynamic airborne networks call for adaptive error-control mechanisms to provide efficient error detection and recovery. Due to the highly dynamic nature of these networks and short contact durations between the nodes, the AeroTP protocol uses an adaptive multi-mode mechanism to provide a varying degree of reliable services to the application data. The two fundamental error-control mechanisms include an end-to-end ARQ mechanism to provide complete reliability in the AeroTP reliable mode and an end-to-end FEC mechanism to provide statistical reliability in the AeroTP quasi-reliable mode. In this paper, we present our implementation of the hybrid-ARQ mechanism in ns-3 to improve the throughput and delay performance of the AeroTP protocol. We also compare and analyze the performance of hybrid-ARQ against the different AeroTP modes, TCP, and UDP protocols.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

End-to-End ARQ: Transport-Layer Reliability for Airborne Telemetry Networks

ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, CaliforniaDue to the mission-critical nature of command-and-control traffic in the telemetry environment, it is imperative that reliable transfer be supported. The AeroTP disruption-tolerant transport protocol is intended for this environment. The mechanism for reliable transfer is ARQ with end-to-end acknowledgments. This has significant performance limitations resulting from the highly-dynamic nature of airborne telemetry networks, since end-to-end paths may not persist long enough for retransmissions to be received. We use ns-3 to analyze the AeroTP ARQ mechanism, along with tunable parameters that may improve performance in reliable transfer mode.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

Comparison of Adaptive Transport Layer Error-Control Mechanisms for Highly-Dynamic Airborne Telemetry Networks

Proceedings of the International Telemetering Conference (ITC), October, 2012

Performance Analysis of the AeroTP Transport Protocol for Highly-Dynamic Airborne Telemetry Networks

ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, NevadaDue to the challenging network conditions posed by a highly-dynamic airborne telemetry environment, it is essential for the transport protocol to provide automated mechanisms that dynamically adapt to changing end-to-end performance on any path. The AeroTP multi-mode transport protocol provides service tailored to the requirements of the telemetry mission control and data packets, achieving better performance compared to the traditional TCP and UDP. We use ns-3 to simulate the AeroTP protocol's reliable and quasi-reliable modes and demonstrate the performance tradeoffs between the modes, as well as comparing their performance with TCP and UDP.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

Opportunistic transport for disrupted airborne networks

Proceedings of the IEEE Military Communications Conference (MILCOM), October 29–November 1, 2012, pp. 737–745

A CASE OF FOCAL GLOMERULOSCLEROSIS ASSOCIATED WITH CYSTINURIA

We report a case of cystinuria in which the nephrotic syndrome developed during treatment with tiopronin (alpha-mercaptopropionylglycine). Light microscopy of renal biopsy specimen showed focal glomerulosclerosis. Proteinuria resolved after withdrawal of the drug and without corticosteroid administration. The pathogenesis of tiopronin-induced nephropathy and this unusual presentation of symptoms are discussed with respect to the literature

Protocols for Highly-Dynamic Airborne Networks

End-to-end communication in highly-dynamic airborne networks is challenging due to the presence of highly mobile nodes and the inherent nature of wireless communication channels. Domain-specific protocols are required that can address these challenges and enable reliable transmission of data in this environment. We develop the ANTP (airborne network and transport protocols) suite that operates in this highly-dynamic environment while utilising cross-layer optimisations between the physical, MAC, network, and transport layers. We show how each component in the ANTP suite outperforms the traditional TCP/IP and MANET protocols through simulation using ns-3. Having verified these protocols through simulation and analysis, the next step towards deployment of the ANTP suite is developing a crossplatform implementation of the protocols. Towards this end we present an architecture for the protocol stack to be implemented in the Python programming language