Controle de congestionamento do protocolo TCP em sistemas de comunicação sem fio CDMA usando estrategia de detecção multiusuario, arranjo de antenas e correção de erro FEC

Cifuentes, Gonzalo Fernando Olmedo; Almeida, Celso de

doi:10.47749/t/unicamp.2008.435859

Cited by 4 publications

(5 citation statements)

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“…A normalized throughput (ηϑ) was obtained for TCP Reno, TCP Westwood, TCP-NACK Reno and TCP-NACK Westwood. The TCP Reno and Westwood results were calculated by (16), and the TCP-NACK results by (17). Figure 8 shows a comparison of the generated curves for each protocol as a function of the error packet probability.…”

Section: Results From Mathematical Analysismentioning

confidence: 99%

“…We start the analysis from a mathematical modeling of the Generic TCP behavior in order to develop an adaptation for corrupted packets retransmission without the CWND size reduction (i.e., the TCP-NACK performance idea) [16]. For this purpose, Slow Start and Congestion Avoidance algorithms were used for modeling the Generic TCP protocol in their Reno and Westwood version.…”

Section: Mathematical Analysismentioning

confidence: 99%

“…where π (W 0 =i) is the asymptotic probability of the initial window size W 0 . Then, we added in (16) the packet loss probability effect due to wireless issues in order to fit the model to the TCP-NACK protocol behavior proposed. Therefore, if the packets are corrupted due to the wireless channel, these errors are recognized by NACKs, and the CWND increases normally (i.e., until the depletion of the receptor buffer).…”

Section: Mathematical Analysismentioning

confidence: 99%

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Performance Analysis of a Novel TCP Protocol Algorithm Adapted to Wireless Networks

et al. 2020

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As telecommunication systems evolve towards new-generation architectures, likewise, new protocols are created in order to improve efficiency. One of these protocols is Transmission Control Protocol (TCP), which controls the transmission bit rate in function of network congestion. Nevertheless, in wireless communications, there appear problems such as noise and interference, for which TCP was not designed. Based on these problems, there exist some methods trying to mitigate congestion, such as explicit loss notifications and the use of end-to-end codification. The aim of this work was to propose a wireless TCP protocol improvement, considering a negative acknowledgment (NACK), which allows to differentiate between losses due to congestion and losses due to wireless channel issues. NACK employs a small protocol packet and produces improvement in the quality of service metrics. The experiments were carried out in in-door and out-door environments, over an online video game scenario, and over a long-distance wireless link between two islands. The average results show a 25-percent delay improvement and a 5-percent jitter improvement when compared to the original TCP Reno protocol, while for throughput a 90-percent improvement was achieved for distances between 100 and 414 m.

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Section: Results From Mathematical Analysismentioning

confidence: 99%

Section: Mathematical Analysismentioning

confidence: 99%

Section: Mathematical Analysismentioning

confidence: 99%

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Performance Analysis of a Novel TCP Protocol Algorithm Adapted to Wireless Networks

et al. 2020

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“…O protocolo TCP é sensível às perdas e requer uma modiĄcação do algoritmo de controle que permita sua adaptação para ambientes sem Ąo. A iniciativa deste estudo consiste em implementar e avaliar a proposta de um novo algoritmo de controle, TCP-NACK [1], como solução ao problema exposto, sendo capaz de distinguir segmentos com erro e as perdas por congestionamento para usar os recursos de forma mais eĄciente.…”

Section: Deąnição Do Problemaunclassified

“…Um enfoque adequado para o tratamento dos segmentos em transmissões sem Ąo consiste no reenvio dos segmentos perdidos, assim que seja possível sem a redução da janela de congestionamento [2]. Uma modiĄcação do protocolo TCP que satisfaz essas condições foi proposto em [1], onde a vazão é aumentada mediante o envio de notiĄcações de erro pelo receptor para o transmissor não reduzir a janela de congestionamento.…”

Section: Capítulo 5 Algoritmo Tcp-nackunclassified

Avaliação de desempenho do protocolo TCP-NACK em canais com desvanecimento Rayleigh

Albuja¹,

Almeida²

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Os enlaces sem Ąo são propensos a gerar mais erros e perdas de segmentos devido à natureza do desvanecimento neste canal de comunicação. A falta de um mecanismo no protocolo TCP Reno que permita distinguir as perdas por erros aleatórios das perdas por congestionamento, resulta na redução da vazão de dados e um desempenho inferior ao esperado. A Ąm de melhorar o desempenho do protocolo TCP sobre redes sem Ąo, uma variante do protocolo TCP que utiliza uma conĄrmação negativa, NACK, foi proposta previamente em [1] para informar ao transmissor acerca do recebimento de um segmento com erro para sua retransmissão instantânea sem reduzir a janela de congestionamento. Na presente dissertação será avaliado o desempenho do algoritmo TCP-NACK sobre um cenário de provas com desvanecimento Rayleigh. Os resultados mostram que o protocolo TCP-NACK possui melhor desempenho em relação ao protocolo TCP em enlaces sem Ąo.

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Performance evaluation of a new wireless TCP algorithm in out-door and in-door environments on WiFi and WiMAX links

Lara-Cueva

Olmedo

Calvopina

2015

2015 CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON)

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Controle de congestionamento do protocolo TCP em sistemas de comunicação sem fio CDMA usando estrategia de detecção multiusuario, arranjo de antenas e correção de erro FEC

Cited by 4 publications

References 0 publications

Performance Analysis of a Novel TCP Protocol Algorithm Adapted to Wireless Networks

Performance Analysis of a Novel TCP Protocol Algorithm Adapted to Wireless Networks

Avaliação de desempenho do protocolo TCP-NACK em canais com desvanecimento Rayleigh

Performance evaluation of a new wireless TCP algorithm in out-door and in-door environments on WiFi and WiMAX links

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