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

Barakat, Chadi; Fawal, Alaeddine Al

doi:10.1016/j.peva.2004.03.002

Cited by 38 publications

(44 citation statements)

References 23 publications

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“…Indeed, substituting d in (14) by its value in (8), setting ν = 0.5, and recalling that α is equal to 1/(bRT T 2 ), we get the square root formula in (15). This can also be obtained from (9), aŝ C(k) = 0 for all k in the case of deterministic inter-loss times.…”

Section: ) Iid Random Losses (General Renewal Process)mentioning

confidence: 90%

“…Formulas that take into account this burstiness can help to predict the impact of coding schemes on TCP connections, and hence to optimize the amount of redundancy that should be added. A model is presented in [9] to optimize the amount of redundancy on a noisy link using a formula for TCP throughput. Another important use of closed-form expressions for the average transmission rate (or equivalently the throughput) is in the design of TCP-friendly applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A stochastic model of TCP/IP with stationary random losses

Altman¹,

Avrachenkov²,

Barakat³

2005

IEEE/ACM Trans. Networking

111

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Abstract-In this paper, we present a model for TCP/IP congestion control mechanism. The rate at which data is transmitted increases linearly in time until a packet loss is detected. At this point, the transmission rate is divided by a constant factor. Losses are generated by some exogenous random process which is assumed to be stationary ergodic. This allows us to account for any correlation and any distribution of inter-loss times. We obtain an explicit expression for the throughput of a TCP connection and bounds on the throughput when there is a limit on the window size. In addition, we study the effect of the Timeout mechanism on the throughput. A set of experiments is conducted over the real Internet and a comparison is provided with other models that make simple assumptions on the inter-loss time process. The comparison shows that our model approximates well the throughput of TCP for many distributions of inter-loss times.

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Section: ) Iid Random Losses (General Renewal Process)mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A stochastic model of TCP/IP with stationary random losses

Altman¹,

Avrachenkov²,

Barakat³

2005

IEEE/ACM Trans. Networking

111

View full text Add to dashboard Cite

show abstract

“…When the condition of stability λ·S < αB is satisfied, we are sure that the TCP transfers are able to end and that they will not be aborted due to lack of bandwidth. In [2], we found that under our assumption on the error process, α is equal to:…”

Section: Model For Tcp Trafficmentioning

confidence: 94%

Analysis of TCP latency over wireless links supporting FEC/ARQ-SR for error recovery

Abdelmoumen¹,

Malli²,

Barakat³

2004

2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577)

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Abstract-We study in this paper the performance of TCP over a wireless link implementing hybrid FEC/ARQ-SR at the link layer. The study is done by simulating a large number of TCP transfers over a wireless link 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 minimize the latency of TCP. We provide results for different physical characteristics of the wireless link (delay, error rate), different traffic loads and different file sizes. Our main finding is that the latency of TCP always improves with the persistency of ARQ, except for some extreme cases where the delay is large, files are small, and the loss rate is low. When adding FEC, the latency of TCP improves then deteriorates, and the deterioration is more pronounced in the case of large files, high loss rate and small delay. Another finding of our study is that with the hybrid mechanism, the wireless link is able to carry more traffic than when FEC and ARQ-SR are separately used.

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“…As a result, the effect of link recovery in such networks should be thoroughly analyzed. In earlier work [13], the performance of a series of ARQ mechanisms are analyzed in the link layer without considering the TCP layer effect. In this work, a set of simulations are performed and results are analyzed to show impact of link recovery on TCP's performance.…”

Section: Introductionmentioning

confidence: 99%

Link Layer Correction Techniques and Impact on TCP’s Performance in IEEE 802.11 Wireless Networks

Dalal¹,

Sarkar²,

Dasgupta³

et al. 2014

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TCP performance degrades when end-to-end connections extend over wireless links which are characterized by high Bit Error Rate and intermittent connectivity. Such degradation is mainly accounted for TCP's unnecessary congestion control actions while attempting TCP loss recovery. Several independent link loss recovery approaches are proposed by researchers to reduce number of losses visible at TCP. In this paper we first presented a survey of loss mitigation techniques at wireless link layer. Secondly performance evaluation for TCP through Type 0 Automatic Retransmission Request mechanism in erroneous Wireless LAN is presented. In particular, simulations are performed taking into account the wireless errors introduced over IEEE 802.11 link using a well-established 2-State Markov model. TCP performance is evaluated under different settings for maximum link retransmissions allowed for each frame. Simulation results show that, link retransmission improves TCP performance by reducing losses perceived at TCP sender. However, such improvement is often associated with adverse effect on other TCP parameters that may cost a lot in return under extreme network conditions. In this paper an attempt is made to observe impact of link retransmissions on the performance of multiple TCP flows competing with each other. The analysis presented in this paper signifies the scope for maximizing TCP's throughput at the least possible cost.

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

Cited by 38 publications

References 23 publications

A stochastic model of TCP/IP with stationary random losses

A stochastic model of TCP/IP with stationary random losses

Analysis of TCP latency over wireless links supporting FEC/ARQ-SR for error recovery

Link Layer Correction Techniques and Impact on TCP’s Performance in IEEE 802.11 Wireless Networks

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