D-Proxy: Reliability in wireless networks

Murray, David; Koziniec, Terry; Dixon, Michael

doi:10.1109/apcc.2010.5679750

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…Figure 5 shows how proxies work in wireless network scenario. However, introducing proxies result in loss of end-to-end semantics of TCP and increased delay due to buffering [13]. Buffers at intermediate proxies are prone to get exhausted if the link succeeding it is a slower link.…”

Section: Proxy Based Tcp Approachesmentioning

confidence: 97%

Techniques for Enhancing TCP Performance in Wireless Networks

Francis

Narasimhan

Nayak

2012

2012 32nd International Conference on Distributed Computing Systems Workshops

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Transmission Control Protocol (TCP) carries the maximum Internet traffic, so performance of TCP largely affects the performance of Internet. However, end-to-end throughput in TCP degrades notably when operated in wireless networks, since random packet losses and packet reordering are considered as congestion. In wireless networks, due to high bit error rate and changing level of congestion, retransmission timeouts for packets lost in transmission is unavoidable. TCP misinterprets this loss to congestion and invokes congestion control by triggering fast retransmission and fast recovery, leading to under-utilization of the network resources. This paper presents various performance improvement mechanisms by which TCP does not consider every packet loss as congestion. These mechanisms help TCP to distinguish between congestion and packet loss and increase throughput performance.

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Section: Proxy Based Tcp Approachesmentioning

confidence: 97%

Techniques for Enhancing TCP Performance in Wireless Networks

Francis

Narasimhan

Nayak

2012

2012 32nd International Conference on Distributed Computing Systems Workshops

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“…Figure 3 shows how network partitioning leads to inactive time periods [48]. The other constraints in wireless networks are memory and processing constraints [24,28,41] and QoS constraints [10,21,49]. TCP has to be modified to work effectively in wireless networks and treat the problems specific to wireless networks based on their merit rather than blindly triggering congestion control mechanisms.…”

Section:  Bandwidth Limitationmentioning

confidence: 99%

“…Figure 15 shows how proxies work in wireless network scenario. However, introducing proxies results in loss of end-to-end semantics of TCP and increased delay due to buffering [28]. Buffers at intermediate proxies are prone to get exhausted if the link succeeding it is a slower link.…”

Section: 25mentioning

confidence: 99%

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Enhancing TCP Congestion Control for Improved Performance in Wireless Networks

Francis

Narasimhan

Nayak

2012

Ad-Hoc, Mobile, and Wireless Networks

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Transmission Control Protocol (TCP) designed to deliver seamless and reliable end-to-end data transfer across unreliable networks works impeccably well in wired environment. In fact, TCP carries the around 90% of Internet traffic, so performance of Internet is largely based on the performance of TCP. However, end-to-end throughput in TCP degrades notably when operated in wireless networks. In wireless networks, due to high bit error rate and changing level of congestion, retransmission timeouts for packets lost in transmission is unavoidable. TCP misinterprets these random packet losses, due to the unpredictable nature of wireless environment, and the subsequent packet reordering as congestion and invokes congestion control by triggering fast retransmission and fast recovery, leading to under-utilization of the network resources and affecting TCP performance critically. This thesis reviews existing approaches, details two proposed systems for better handling in networks with random loss and delay. Evaluation of the proposed systems is conducted using OPNET simulator by comparing against standard TCP variants and with varying number of hops.iii Dedicated to my father.iv

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“…The loss of this acknowledgement also causes a retransmission. Under perfect conditions, with no retransmissions, the overhead of this scheme is approximately 25% of the total transmission time [11] in 802.11a/b/g networks. In more recent 802.11 amendments, block acknowledgements have been used to reduce this overhead.…”

Section: ) Arqmentioning

confidence: 99%

Measuring the reliability of 802.11 WiFi networks

Murray

Koziniec

Dixon

et al. 2015

2015 Internet Technologies and Applications (ITA)

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Abstract-Over half of the transmission time in WiFi networks is dedicated to ensuring that errors are corrected or detected. Despite these mechanisms, many studies have concluded that frame error rates vary. An increased understanding of why frames are lost is a pragmatic approach to improving real world 802.11 throughput. The potential beneficiaries of this research, include rate control algorithms, Modulation and Coding Schemes, simulation models, frame size selection and 802.11 configuration guidelines. This paper presents a measurement study of the factors which correlate with packet loss in 802.11 WiFi. Both passive and active approaches were used to investigate how the frame size, modulation and coding scheme and airtime effect the loss rate. Overall, packet errors were high. The size of frames were not a major determinant of the loss rate. The loss rate decreased as the airtime of transmissions reduced but at substantially lower rates than those suggested in simple packet error models. Future work will further try to isolate and investigate specific errors, such as head on collisions in the preamble.

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D-Proxy: Reliability in wireless networks

Cited by 10 publications

References 16 publications

Techniques for Enhancing TCP Performance in Wireless Networks

Techniques for Enhancing TCP Performance in Wireless Networks

Enhancing TCP Congestion Control for Improved Performance in Wireless Networks

Measuring the reliability of 802.11 WiFi networks

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