Distinguishing congestion losses from wireless transmission losses: a negative result

Biaz, Saad; Vaidya, Nitin H.

doi:10.1109/icccn.1998.998834

Cited by 84 publications

(111 citation statements)

References 7 publications

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“…IEEE 802.11 WLAN). Given the independence of σ i , we write (9). The expectation of Y is computed in the Appendix.…”

Section: Case Of Medium Bandwidth-delay Product Wireless Networkmentioning

confidence: 99%

“…This strategy in the detection of congestion results in a poor performance of the protocol when packets are lost in the network for other reasons than congestion, e.g. [1,4,7,9]. Transmission errors on a noisy link, typically a wireless link, form the main source for non-congestion losses.…”

Section: Introductionmentioning

confidence: 99%

“…[1,3,4,9,11]. Some of these solutions consist in enhancing TCP with additional mechanisms to help it to recover from non-congestion losses without reducing its window (explicit loss notification [4], loss predictors [9], etc.). Other solutions, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of link-level hybrid FEC/ARQ-SR for wireless links and long-lived TCP traffic

Barakat¹,

Fawal²

2004

Performance Evaluation

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Since the TCP protocol uses the loss of packets as an indication of network congestion, its performance degrades over wireless links, which are characterized by a high bit error rate. Different solutions have been proposed to improve the performance of TCP over wireless links, the most promising one being the use of a hybrid model at the link level combining FEC (Forward Error Correction), ARQ-SR (Automatic Repeat Request with Selective Repeat), and an in-order delivery of packets to IP. The drawback of FEC is that it consumes some extra bandwidth to transmit the redundant information. ARQ-SR consumes extra bandwidth only when packets are lost, its drawback is that it increases the round-trip time (RTT), which may deteriorate the performance of TCP. Another drawback of ARQ-SR is that a complete packet can be retransmitted to correct a small piece of errored data. We study in this paper the performance of TCP over a wireless link implementing hybrid FEC/ARQ-SQ. The study is done by simulating and modeling long-lived TCP transfers over wireless links showing Bernoulli errors. We are motivated by how to tune link-level error recovery, e.g. amount of FEC, persistency of ARQ, so as to maximize the performance of TCP. We provide results for different physical characteristics of the wireless link (delay, error rate) and for different traffic loads (number of TCP connections).

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“…IEEE 802.11 WLAN). Given the independence of σ i , we write (9). The expectation of Y is computed in the Appendix.…”

Section: Case Of Medium Bandwidth-delay Product Wireless Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of link-level hybrid FEC/ARQ-SR for wireless links and long-lived TCP traffic

Barakat¹,

Fawal²

2004

Performance Evaluation

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“…For instance, methods to implicitly distinguish corruption from congestion have, thus far, not been successful [10,16]. However, Performance Enhancing Proxies (PEPs) [12] have been shown to improve TCP performance [7], but break the end-to-end semantics of the transport layer connection.…”

Section: Introductionmentioning

confidence: 99%

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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“…Based on R. Jain [7], Saad Biaz and Nitin Vaidya [8], and David A. Hayes and Armitage [9], let, R (round-trip delay(rtt-delay)) and T (throughput) are functions of the w (sender window). To determine the Knee (the point at which throughput starts increasing), measure R and the gradient, of the delay window-curve.…”

Section: Normalised Delay Gradient (Ndg) As Losspredictormentioning

confidence: 99%

Performance Analysis of TCP and its Enhancement for Quality of Service in Mobile Wireless Networks in Single Traffic Using Prioritised Hard Handoff (PH2)

N.G¹,

P²

2016

IJITCS

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Abstract-The research activities in mobile computing and wireless networks strongly indicates that mobile computers and their wireless communication links will be an integral part of the current internet works. Communication over wireless links is characterised by limited bandwidth, high latency, high bit-error rates and temporary disconnections. Most often, networks with wireless links and mobile hosts incur significant losses due to handoff. It is also most important that in wireless environment TCP (transmission control protocol) causes degraded end-to-end performance. In this paper, we tried to give solutions to these problems. We adopt a new method to improve the end-to-end reliable transport performance in mobile wireless environment by incorporating changes to network-layer at the base station and mobile host and preserve end-to-end semantics of TCP. The methodology employs NDG (normalised delay gradient) loss-predictor function to determine congestion losses from that of transmission loss. The sender window can adjust its size depending on the loss information. If the loss is due to congestion, congestion control algorithm is invoked to decrease the flow rate. If the loss is due to handoff (transmission loss), immediate-recovery algorithm is invoked to recover the losses caused by the sender TCP. Stochastic equations are used to analyse, i) arrival rate handoff calls, ii) blocking probability of handoff request, iii) distinguish packet loss due to congestion or handoff, iv) dynamics of sender window, v) queue length at the ingress point of the BS router , vi) throughput, and vii) the losses due to congestion and handoff blocking. Our results provide better way understanding the problem of calls drop due to handoff, and providing most accurate solutions for mobile wireless system.

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Distinguishing congestion losses from wireless transmission losses: a negative result

Cited by 84 publications

References 7 publications

Analysis of link-level hybrid FEC/ARQ-SR for wireless links and long-lived TCP traffic

Analysis of link-level hybrid FEC/ARQ-SR for wireless links and long-lived TCP traffic

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

Performance Analysis of TCP and its Enhancement for Quality of Service in Mobile Wireless Networks in Single Traffic Using Prioritised Hard Handoff (PH2)

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