Experimental Assessment of the Backoff Behavior of Commercial IEEE 802.11b Network Cards

Bianchi, Giuseppe; Stefano, Antonio Di; Giaconia, C.; Scalia, Luca; Terrazzino, Gabriella; Tinnirello, Ilenia

doi:10.1109/infcom.2007.141

Cited by 90 publications

(75 citation statements)

References 10 publications

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“…We were not able to derive such an average value from driver-level information. Moreover, the analytical derivation of such a parameter, in principle relatively easy (e.g., using EDCA extensions of the model [25]) from the knowledge of the MAC layer parameters employed by the competing stations, was discouraged by the fact that, as shown in [26], the operation of the two considered cards slightly, but noticeably for our specific purposes, differs from the theoretically expected performance.…”

Section: B Experimental and Theoretical Performance Versus The Numbementioning

confidence: 99%

Cross-layer H.264 scalable video downstream delivery over WLANs

Bianchi

Detti

Loreti

et al. 2010

2010 IEEE International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)

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Abstract-Thanks to its in-network drop-based adaptation capabilities, H.264 Scalable Video Coding is perceived as an effective approach for delivering video over networks characterized by sudden large bandwidth fluctuations, such as Wireless LANs. Performance may be boosted by the adoption of application-aware/cross-layer schedulers devised to intelligently drop video data units (NALUs), so that i) decoding dependencies are preserved, and ii) the quality perceived by the end users is maximized. In this paper, we provide a theoretical formulation of a QoE utility-optimal cross-layer scheduling problem for H.264 SVC downlink delivery over WLANs. We show that, because of the unique characteristics of the WLAN MAC operation, this problem significantly differs from related approaches proposed for scheduled wireless technologies, especially when the WLAN carries background traffic in the uplink direction. From these theoretical insights, we derive, design, implement and experimentally assess a simple practical scheduling algorithm, whose performance is very close to the optimal solution.

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Section: B Experimental and Theoretical Performance Versus The Numbementioning

confidence: 99%

Cross-layer H.264 scalable video downstream delivery over WLANs

Bianchi

Detti

Loreti

et al. 2010

2010 IEEE International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)

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show abstract

“…Measurement studies have been performed on single-tier (i.e., wireless backhaul only) mesh networks considering appropriate routing metrics [16], [17], link capture effects [18], and analysis of different protocol implementations (802.11b and 802.11g) [19]. Likewise, prior work has shown that as the density of mesh nodes increases, the forwarding path can have higher quality links, thus increasing connectivity and throughput of the network at-large [15].…”

Section: Related Workmentioning

confidence: 99%

A Measurement Study of Multiplicative Overhead Effects in Wireless Networks

Jcamp

Mancuso

Ogurewitz

et al. 2008

2008 Proceedings IEEE INFOCOM - The 27th Conference on Computer Communications

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Abstract-In this paper, we perform an extensive measurement study on a multi-tier mesh network serving 4,000 users. Such dense mesh deployments have high levels of interaction across heterogeneous wireless links. We find that this heterogeneous backhaul consisting of data-carrying (forwarding) links and nondata-carrying (non-forwarding) links creates two key effects on performance. First, we show that low-rate management and control packets can produce a disproportionally large degradation in data throughput. We define a metric for this effect called Wireless Overhead Multiplier and use it to quantify the impact of MAC and PHY mechanisms on the the throughput degradation. Surprisingly, we show that these multiplicative effects are primarily driven by the non-forwarding links where, in the worst case, data packets lose physical layer capture to the overhead, yielding disproportionate throughput degradation. Finally, we show that when data flows contend in this worst-case scenario, the loss-based autorate policy is unnecessarily triggered, causing throughput imbalance and poor network utilization.

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“…In Section V we deduce that 11 Mb/s will offer better performance than 6 Mb/s in practical situations. We note that a number of papers have highlighted that care is needed to conduct 802.11 measurements as the hardware may not implement the standard correctly [7], it can have undocumented features such as antenna selection [8] or interference mitigation [9]. For our experiments to be repeatable, in the Appendix we describe in detail the measurement setup that we used to assess the available 802.11g rates, as substantial care is required to avoid complications of the 802.11 protocol and its implementation.…”

Section: Introductionmentioning

confidence: 99%

The 802.11g 11 Mb/s Rate is More Robust than 6 Mb/s

Huang

Malone

Duffy

2011

IEEE Trans. Wireless Commun.

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Abstract-The robustness to noise of the 802.11b/g 5.5 Mb/s and 11 Mb/s rates must be investigated experimentally as they cannot be predicted theoretically. In this paper we report on detailed outdoor and indoor measurements that lead us to the surprising conclusion that the 11 Mb/s 802.11g rate experiences fewer packet losses than the 6 Mb/s 802.11g rate at any given (symbol) SNR. This occurs due to the combination of modulation and physical layer coding schemes used by these rates and has serious implications for rate control algorithms. The practical implications of this, factoring in the interaction between packet loss and 802.11 MAC retries, is that 6 Mb/s is effectively redundant as a packet transmission rate if the 11 Mb/s rate is available.

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Experimental Assessment of the Backoff Behavior of Commercial IEEE 802.11b Network Cards

Cited by 90 publications

References 10 publications

Cross-layer H.264 scalable video downstream delivery over WLANs

Cross-layer H.264 scalable video downstream delivery over WLANs

A Measurement Study of Multiplicative Overhead Effects in Wireless Networks

The 802.11g 11 Mb/s Rate is More Robust than 6 Mb/s

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