“Challenged Networks” often violate the TCP design key assumption of continuous path availability from the source to the sink node. These networks are the preferred target of Delay/Disruption Tolerant Networking (DTN), which aims at providing a more robust network architecture. Against disruptions, however, even standard TCP offers a certain level of robustness, through its many retransmission algorithms. The aim of the paper is to present a comparative analysis of the TCP and DTN Bundle protocol retransmission algorithms triggered by channel disruptions. This analysis provides the reader with a comprehensive view of the many mechanisms involved and a first assessment of their impact on some performance metrics. Although DTN put on top of TCP clearly offers higher resilience against long disruptions, TCP itself can provide a certain level of robustness, provided that the many retransmission parameters are properly set. The analysis is completed by some numerical evaluations on a GEO satellite channel obtained by means of a Linux testbed.
Analysis of TCP and DTN Retransmission Algorithms in Presence of Channel Disruptions
CAINI, CARLO;FIRRINCIELI, ROSARIO;
2009
Abstract
“Challenged Networks” often violate the TCP design key assumption of continuous path availability from the source to the sink node. These networks are the preferred target of Delay/Disruption Tolerant Networking (DTN), which aims at providing a more robust network architecture. Against disruptions, however, even standard TCP offers a certain level of robustness, through its many retransmission algorithms. The aim of the paper is to present a comparative analysis of the TCP and DTN Bundle protocol retransmission algorithms triggered by channel disruptions. This analysis provides the reader with a comprehensive view of the many mechanisms involved and a first assessment of their impact on some performance metrics. Although DTN put on top of TCP clearly offers higher resilience against long disruptions, TCP itself can provide a certain level of robustness, provided that the many retransmission parameters are properly set. The analysis is completed by some numerical evaluations on a GEO satellite channel obtained by means of a Linux testbed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
