Delay Tolerant Payload Conditioning protocol

Tsaoussidis

2017

Satell Commun Network

Self Cite

Summary In this work, we propose an end‐to‐end retransmission framework for dynamically calculating efficient retransmission time‐out intervals in delay‐tolerant networks (DTNs) with scheduled connectivity. The proposed framework combines deterministic and statistical information about the network state to calculate worst‐case estimates about the expected round trip times. Such information includes connectivity schedules, convergence layer protocols specifics, communication link characteristics, and network statistics about the maximum expected packet error rates and storage congestion. We detail the implementation of the proposed framework within the end‐to‐end application data conditioning layer proposed for the DTN architecture, realized by the Delay‐Tolerant Payload Conditioning protocol, as part of the Interplanetary Overlay Network–DTN reference implementation, and evaluate its performance in a complex deep‐space emulation scenario in our DTN testbed. Our results show that our approach achieves great accuracy in round‐trip time estimations and, therefore, faster retransmissions of lost data, in comparison to the statically configured retransmission mechanism of the original Delay‐Tolerant Payload Conditioning protocol. As a result, in‐order data reception rate and storage requirements on the receiver side are significantly improved, at minimum or even zero extra cost in transmission overhead due to duplicate transmissions.

Section: Evaluation/experimental Methodologymentioning

confidence: 99%

“…The importance of a retransmission timer has also been identified in space DTNs . However, the high RTT variance makes its configuration a challenging task .…”

Section: Background and Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An adaptive end‐to‐end RTO calculation framework for DTNs with scheduled connectivity

Diamantopoulos

Tsaoussidis

2017

Satell Commun Network

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“…In addition, several works propose end-to-end reliability mechanisms for space internetworks. In [14] and [15], the authors investigate the use of reliable end-to-end transport protocols in interplanetary networks whereas in [11] a bundle-layer reliability mechanism is proposed in order to provide end-to-end monitoring. A more accurate prediction of end-to-end latency will allow for the configuration of appropriate timers and, consequently, improve the performance of such mechanisms.…”

Section: Background and Related Workmentioning

confidence: 99%

Towards flexibility and accuracy in space DTN communications

Proceedings of the 8th ACM MobiCom Workshop on Challenged Networks

Tsapeli

Diamantopoulos

et al. 2013

Self Cite

AlthoughInterplanetary Telecommunications rely on preconfigured contact schedules to make routing decisions, there is a lack of appropriate mechanisms to notify the network about contact plan changes. In order to fill this gap, we propose and evaluate a framework for disseminating information about queueing delays and link disruptions. In this context, we present such a mechanism, focusing not only on its functional properties, but rather on its impact objectives: to improve accuracy and routing performance. Supportively, we couple this mechanism with a DTN-compatible protocol, namely Contact Plan Update Protocol (CPUP), which implements our dissemination policy. Through simulation of space scenarios we show that accuracy can be significantly improved in all cases while routing performance can achieve a wide range, from minor through to significant gains, conditionally.

“…associated mechanisms evolved in the IRTF DTN research group [8]; an IETF working group has been recently formed [9] to develop Internet standards. In parallel, various DTN-related protocols, such as the Licklider Transmission Protocol [10], the BP [5], and the Delay-Tolerant Payload Conditioning protocol [11], are under standardization by the Consultative Committee for Space Data Systems (CCSDS), to enable their deployment in space environments [12,13]. CGR standardization inside CCSDS is expected to begin in the imminent future, as architectural and protocol discussions have already reached the required level of maturity.Due to the possible lack of continuous end-to-end connectivity, routing in DTN is a very complex problem and one of the most challenging research issues.…”

mentioning

confidence: 99%

Analysis of contact graph routing enhancements for DTN space communications

Caini

Tsaoussidis

2015

Satell Commun Network

SUMMARYIn this paper, we analyze the performance of two contact graph routing (CGR) enhancements, namely, CGR with earliest transmission opportunity (CGR-ETO) and overbooking management. CGR-ETO aims to improve the accuracy of predicted bundle delivery time by exploiting existing information on queueing delay, in routing decisions. Overbooking management aims to proactively handle contact oversubscription, which occurs when high-priority bundles are forwarded to a contact that is already fully subscribed by lower-priority bundles. These two enhancements have been recently included in the official CGR version as part of the Interplanetary Overlay Network delay-tolerant/disruption-tolerant networking implementation maintained by the National Aeronautics and Space Administration. In parallel to the comparative evaluation of the enhancements against the original CGR, we introduce an experimental version of CGR-ETO that exploits information on locally routed data to calculate queueing delays in all hops through the path to destination, rather than in the first hop only. We evaluate the aforementioned enhancements in a set of emulation experiments conducted on a GNU/Linux testbed and compare official and experimental versions of CGR. Results show that the two enhancements are complementary and can significantly improve routing decisions compared with older versions of CGR, particularly in the presence of parallel routes and traffic of different priorities. These advantages are further extended when the experimental version of ETO is considered.