TCP-Peach: a new congestion control scheme for satellite IP networks

Akyildiz, Ian F.; Morabito, Giacomo; Palazzo, Sergio

doi:10.1109/90.929853

Cited by 246 publications

(162 citation statements)

References 29 publications

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“…Furthermore, at these BERs, the difference in performance between stock SACK TCP and SACK TCP enhanced with Oracle support is nearly non-existent in all simulations presented in this 1 The propagation delay between the Earth and a geo-synchronous satellite is roughly one-eight of a second, yielding a one-way propagation delay of 250 msec and a round-trip time of 500 msec.…”

Section: Single Flow Simulationsmentioning

confidence: 99%

“…TCP Peach, a congestion control scheme proposed for satellite networks, uses dummy segments (that must be treated as low-priority segments by all intermediate nodes) to probe the availability of network resources [1]. If all the dummy segments are acknowledged, then the sender interprets this as evidence that there are unused resources in the network and accordingly can increase its transmission rate.…”

Section: Implicit Loss Discriminationmentioning

confidence: 99%

“…However, congestion avoidance behaviors based on accurate estimation of the end-to-end path capacity can enhance TCP performance in certain environments in which losses can occur both due to congestion and corruption. Examples of congestion avoidance behaviors that implicitly account for corruption losses based on path capacity estimation include TCP Westwood [14] and TCP Peach [1].…”

Section: Implicit Loss Discriminationmentioning

confidence: 99%

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Explicit transport error notification (ETEN) for error-prone wireless and satellite networks

Krishnan¹,

Sterbenz

Eddy

et al. 2004

Computer Networks

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Wireless and satellite networks often have non-negligible packet corruption rates that can significantly degrade TCP performance. This is due to TCP's assumption that every packet loss is an indication of network congestion (causing TCP to reduce the transmission rate). This problem has received much attention in the literature. In this paper, we take a broad look at the problem of enhancing TCP performance under corruption losses, and include a discussion of the key issues. The main contributions of this paper are: ( ) a confirmation of previous studies that show the reduction of TCP performance in the face of corruption loss, and in addition a plausible upper bound achievable with perfect knowledge of the cause of loss, ( ) a classification of the potential mitigation space, and ( ) the introduction of a promising new mitigation that employs rich cumulative information from intermediate nodes in a path to form a better congestion response.We first illustrate the performance implications of corruption-based loss for a variety of networks via simulation. In addition, we show a rough upper bound on the performance gains a TCP could get if it could perfectly determine the cause of each segment loss -independent of any specific mechanism for TCP to learn the root cause of packet loss. Next, we provide a taxonomy of potential practical classes of mitigations that TCP end-points and intermediate network elements can cooperatively use to decrease the performance impact of corruption-based loss. Finally, we briefly consider a potential mitigation, called cumulative explicit transport error notification (CETEN), which covers a portion of the solution space previously unexplored. CETEN is shown to be a promising mitigation strategy, but a strategy with numerous formidable practical hurdles still to overcome.£ Pre-print: Accepted for publication in Elsevier Computer Networks.

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Section: Single Flow Simulationsmentioning

confidence: 99%

Section: Implicit Loss Discriminationmentioning

confidence: 99%

Section: Implicit Loss Discriminationmentioning

confidence: 99%

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Explicit transport error notification (ETEN) for error-prone wireless and satellite networks

Krishnan¹,

Sterbenz

Eddy

et al. 2004

Computer Networks

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“…connections with RTT4RTT 0 Þ; which therefore maintain their standard increase rate. In addition to (9), both the initial cwnd } and the original ssthresh must be multiplied by r; as well as the size of the transmission buffer (to manage the larger burstiness of TCP Hybla transmission). Finally, note that the expressions (7) and (9) hold true under the assumption that the sender is limited by the congestion window and not by the advertised window.…”

Section: Slow Start and Congestion Avoidance Algorithmsmentioning

confidence: 99%

TCP Hybla: a TCP enhancement for heterogeneous networks

Caini

Firrincieli

2004

Satell Commun Network

324

170

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SUMMARYIn heterogeneous networks, TCP connections that incorporate a terrestrial or satellite radio link are greatly disadvantaged with respect to entirely wired connections, because of their longer round trip times (RTTs). To cope with this problem, a new TCP proposal, the TCP Hybla, is presented and discussed in the paper. It stems from an analytical evaluation of the congestion window dynamics in the TCP standard versions (Tahoe, Reno, NewReno), which suggests the necessary modifications to remove the performance dependence on RTT. TCP Hybla performance is firstly evaluated in the case of an ideal channel, with good correlation between analytical and simulation data. Then, more realistic situations, which require the adoption of a benchmark network topology and a careful ns-2 simulation set-up, are examined. In particular, TCP Hybla performance is compared with that achievable by TCP standard in the presence of congestion and link losses, either separately or jointly considered. In all the examined cases, the superiority of TCP Hybla is evident, as it greatly reduces the severe penalization suffered by wireless, and especially satellite, TCP connections. Finally, it is worth noting that TCP Hybla does not infringe the end to end semantics of TCP and is compatible with other promising enhancements.

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“…The second category deals with TCP enhancements that revise and improve the basic TCP procedures. Of the many proposals appearing in the literature, this paper focuses in particular on TCP Peach [8], Westwood [9], Hybla [10], SCTP [11] and CK-STP [12], because they seem well suited to coping with satellite characteristics, i.e. long RTTs and random losses.…”

Section: Introductionmentioning

confidence: 99%

Transport layer protocols and architectures for satellite networks

Caini

Firrincieli

Marchese

et al. 2006

Satell Commun Network

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SUMMARYDesigning efficient transmission mechanisms for advanced satellite networks is a demanding task, requiring the definition and the implementation of protocols and architectures well suited to this challenging environment. In particular, transport protocols performance over satellite networks is impaired by the characteristics of the satellite radio link, specifically by the long propagation delay and the possible presence of segment losses due to physical channel errors. The level of impact on performance depends upon the link design (type of constellation, link margin, coding and modulation) and operational conditions (link obstructions, terminal mobility, weather conditions, etc.). To address these critical aspects a number of possible solutions have been presented in the literature, ranging from limited modifications of standard protocols (e.g. TCP, transmission control protocol) to completely alternative protocol and network architectures. However, despite the great number of different proposals (or perhaps also because of it), the general framework appears quite fragmented and there is a compelling need of an integration of the research competences and efforts. This is actually the intent of the transport protocols research line within the European SatNEx (Satellite Network of Excellence) project. Stemming from the authors' work on this project, this paper aims to provide the reader with an updated overview of all the possible approaches that can be pursued to overcome the limitations of current transport protocols and architectures, when applied to satellite communications. In the paper the possible solutions are classified in the following categories: optimization of TCP interactions with lower layers, TCP enhancements, performance enhancement proxies (PEP) and delay tolerant networks (DTN). Advantages and disadvantages of the different approaches, as well as their interactions, are investigated and discussed, taking into account performance improvement, complexity, and compliance to the standard semantics. From this analysis, it emerges that DTN architectures could integrate some of the most efficient solutions from the other categories, by inserting them in a new rigorous framework. These innovative architectures therefore may represent a promising solution for solving some of the important problems posed at the transport layer by satellite networks, at least in a medium-tolong-term perspective.

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TCP-Peach: a new congestion control scheme for satellite IP networks

Cited by 246 publications

References 29 publications

Explicit transport error notification (ETEN) for error-prone wireless and satellite networks

Explicit transport error notification (ETEN) for error-prone wireless and satellite networks

TCP Hybla: a TCP enhancement for heterogeneous networks

Transport layer protocols and architectures for satellite networks

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