Sniffing out the correct physical layer capture model in 802.11b

Kochut, Andrzej; Vasan, Arunchandar; Shankar, A. Udaya; Agrawala, Ashok K.

doi:10.1109/icnp.2004.1348115

Cited by 170 publications

(168 citation statements)

References 12 publications

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“…The results given in [3] demonstrate that the capture effect phenomenon occurs frequently in the practical 802.11-based WLANs. Furthermore, the throughput for each sender becomes unfair depending on the spatial difference from a sender to a receiver on the assumption that all the senders use the same sending power level [2].…”

Section: Related Workmentioning

confidence: 78%

“…IEEE 802.11 Medium Access Control (MAC) commonly uses the mandatory distributed coordination function (DCF) for channel access, due to its simplicity and efficiency in the operation of data transmission. In the mean time, the capture effect frequently takes place in such WLAN environment [2,3]. The capture effect takes place when two or more nodes transmit simultaneously, i.e., a collision occurs at the common receiver.…”

Section: Introductionmentioning

confidence: 99%

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Reference-based fair MAC algorithm in Wi-Fi WLANs with capture effect

Jeong

Choi

Yoo

2013

J Wireless Com Network

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The widespread deployment of infrastructure WLANs has made Wi-Fi an integral part of today's Internet access technology. Due to the inherent characteristics of the wireless medium in WLAN systems, the capture effect significantly affects the system performance; a receiver can successfully decode a collided frame given that its signal-to-interference and noise ratio is sufficiently high enough, but results in an unfair channel access share among the wireless nodes. In this article, we propose fair capture effect aware MAC (FC-MAC) algorithm, which achieves channel access fairness using a feedback control mechanism. We determine the average waiting time as a common control reference, which provides fair channel access even when the capture effect is present. In result, the algorithm enables each node to converge to a fair channel access share. Among multiple points that yields fair channel access, we determine the optimal target reference that maximizes the aggregate throughput. Through both dynamic system modeling and extensive simulation studies, we show that the FC-MAC algorithm is stable and achieves fairness while improving the aggregate throughput.

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Section: Related Workmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Reference-based fair MAC algorithm in Wi-Fi WLANs with capture effect

Jeong

Choi

Yoo

2013

J Wireless Com Network

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“…Hence whenever the source for this destinations starts transmission first, the link will experience successful packet reception and throughput on this link will not be as severely affected as in HT interaction [9].…”

Section: Hidden Terminal With Capture (Htc)mentioning

confidence: 99%

“…When both these nodes transmit concurrently there is a collision at node 1 since it is in capture range with both nodes. However, when node 3 starts transmitting before node 0, node 2 is able to capture the packet [9]; a collision at node 2 occurs only when node 0 starts transmission before node 3. In this interaction, the link between node 0 and node 1 is the weak link, i.e.…”

Section: Tcp On Three Hop Chainsmentioning

confidence: 99%

TCP over Multi-Hop Wireless Networks: The Impact of MAC Level Interactions

Majeed

Razak

Abu-Ghazaleh

et al. 2009

Ad-Hoc, Mobile and Wireless Networks

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Abstract. In Multi Hop Wireless Networks (MHWNs), nodes act both as end-hosts as well as intermediate routers. When communication occurs, these nodes form chains between different sources and destinations. Researchers have studied how these chains behave, discovering that MAC level interactions play a major role in determining their performance. In this paper, we extend this analysis to study how TCP connections, which involve bidirectional flows, behave over wireless chains. First, we break down and examine the types of chains that occur most frequently in TCP configurations and classify them by the nature of the MAC level interactions that arise in each. We then show that the throughput of TCP over a wireless chain is greatly affected by the type of interactions within the chain. Finally, we show the implications of the MAC level interactions on network performance: specifically, route instability and number of retransmissions.

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“…The details of our OFDM implementation are described in [11]. As observed in [13], [14], the physical capture available in ns-2 is only partially correct because it does not implement the MIM mode transition (i.e., the "stronger-last collision" resolution). We modify ns-2 so that physical capture can be achieved regardless of whether the stronger packet arrives before or after the weaker packet as long as the conditions for a successful physical capture are met.…”

Section: A Ieee 80211a Phy and Macmentioning

confidence: 99%

Cross Layer Multirate Adaptation Using Physical Capture

Park

Kasera

Patwari

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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Abstract-In this paper, to improve the performance of multihop wireless networks, we explore a cross layer multirate adaptation scheme (we call it CROMA) that uses the phenomenon of physical capture at the physical layer for effectively distinguishing losses due to collisions from those due to channel-error. We first estimate the number of packets dropped due to collisions, at each node by counting the number of packets that are not successfully retrieved by physical capture. Next, using a simple algorithm, we assign this collision loss to neighboring sources of packets that might have generated the colliding packets. Using extensive ns-2 simulations, we show that our multirate adaptation scheme consistently outperforms the existing schemes.

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Sniffing out the correct physical layer capture model in 802.11b

Cited by 170 publications

References 12 publications

Reference-based fair MAC algorithm in Wi-Fi WLANs with capture effect

Reference-based fair MAC algorithm in Wi-Fi WLANs with capture effect

TCP over Multi-Hop Wireless Networks: The Impact of MAC Level Interactions

Cross Layer Multirate Adaptation Using Physical Capture

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