A comparison of mechanisms for improving TCP performance over wireless links

Balakrishnan, Hari; Padmanabhan, Venkata N.; Seshan, Srinivasan; Katz, Randy H.

doi:10.1145/248157.248179

Cited by 311 publications

(340 citation statements)

References 11 publications

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“…An effective RTT value can be used as a metrics to load balance arrival rate of handoff calls. 1,18.78] packets with an average value of 19.17 packets. When source TCP recognises that packet loss is due to congestion, decrease the sender window size to half of the current value.…”

Section: Simulation and Performance Analysismentioning

confidence: 99%

“…When it traverses wireless links and mobile hosts incur significant packet losses due to bit errors and handoff. In wireless environment TCP does not satisfy many of the assumptions made, causing degradation in end-to-end performance [1]. Current research activity in mobile computing and wireless networks indicates that mobility and their wireless communication links are the integral parts of the internet works.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Simulation and Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

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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“…After that in Sect. 3 we introduce the problem of evaluating the effect of routing on TCP performance and outline our methodology. Section 4 is the main section where we develop our approach to analyze TCP+routing interactions in IEEE 802.11 based ad hoc networks.…”

Section: Outlinementioning

confidence: 99%

“…This value corresponds to the three seconds noprogress time which was chosen based on our empirical observations that longer no-progress times definitely indicate the presence of the TCP unfairness in ad hoc networks. Finally, we compute the "unsmoothness" metric as in (3).…”

Section: A Definition Of the "Unsmoothness" Metricmentioning

confidence: 99%

“…The problem is linked to the inability of TCP's congestion control to differentiate the packets losses due to radio interferences from those induced by network congestion [3,4,5]. Obviously, the traffic generated by a routing protocol increases the contention at the physical layer and will cause packet losses in addition to those caused by radio collisions between the TCP segments themselves.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the Effect of Ad Hoc Routing on TCP Performance in IEEE 802.11 Based MANETs

Osipov

Tschudin

2006

Next Generation Teletraffic and Wired/Wireless Advanced Networking

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Abstract.In this paper we analyze the impact of different ad hoc routing schemes on TCP traffic in multihop ad hoc wireless networks. Our hypothesis is that beyond a certain network size the uncontrolled broadcast transmission of routing messages will seriously degrade the performance of the TCP protocol. We experimentally determine the admissible operation ranges of MANETs where the level of such degradation is still acceptable for end users.

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SGTP: Smart Grid Transport Protocol for secure reliable delivery of periodic real time data

Kim

Thottan²

2011

Bell Labs Tech. J.

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Amyloid‐β peptide (Aβ) is the principal constituent of plaques associated with Alzheimer's disease (AD) and is thought to be responsible for the neurotoxicity associated with the disease. Copper binding to Aβ has been hypothesized to play an important role in the neruotoxicity of Aβ and free radical damage, and Cu2+ chelators represent a possible therapy for AD. However, many properties of copper binding to Aβ have not been elucidated clearly, and the location of copper binding sites on Aβ is also in controversy. Here we have used a range of spectroscopic techniques to characterize the coordination of Cu2+ to Aβ(1–16) in solution. Electrospray ionization mass spectrometry shows that copper binds to Aβ(1–16) at pH 6.0 and 7.0. The mode of copper binding is highly pH dependent. Circular dichroism results indicate that copper chelation causes a structural transition of Aβ(1–16). UV‐visible absorption spectra suggest that three nitrogen donor ligands and one oxygen donor ligand (3N1O) in Aβ(1–16) may form a type II square‐planar coordination geometry with Cu2+. By means of fluorescence spectroscopy, competition studies with glycine and L‐histidine show that copper binds to Aβ(1–16) with an affinity of Ka ∼ 107M–1 at pH 7.8. Besides His6, His13, and His14, Tyr10 is also involved in the coordination of Aβ(1–16) with Cu2+, which is supported by 1H NMR and UV‐visible absorption spectra. Evidence for the link between Cu2+ and AD is growing, and this work has made a significant contribution to understanding the mode of copper binding to Aβ(1–16) in solution. © 2006 Wiley Periodicals, Inc. Biopolymers 83: 20–31, 2006 This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com

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A comparison of mechanisms for improving TCP performance over wireless links

Cited by 311 publications

References 11 publications

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

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

Evaluating the Effect of Ad Hoc Routing on TCP Performance in IEEE 802.11 Based MANETs

SGTP: Smart Grid Transport Protocol for secure reliable delivery of periodic real time data

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