An Analysis of Active End-to-end Bandwidth Measurements in Wireless Networks

Johnsson, Andreas; Björkman, Mats; Melander, Bob

doi:10.1109/e2emon.2006.1651282

Cited by 14 publications

(17 citation statements)

References 10 publications

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“…Active probing, on the other hand, takes measurements of specific probing traffic at the ingress and the egress of the network to infer the available bandwidth of a network path. Contrary to wired networks a strong impact of packet sizes on bandwidth estimates has been observed for wireless links [15,16,21,19,6]. Here, the fluid model, which is employed by many estimation methods, is clearly violated.…”

Section: Introductionmentioning

confidence: 99%

A Measurement Study of Bandwidth Estimation in IEEE 802.11g Wireless LANs Using the DCF

Bredel

Fidler

2008

NETWORKING 2008 Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet

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Abstract. In this paper we present results from an extensive measurement study of wireless bandwidth estimation in IEEE 802.11 WLANs using the distributed coordination function. We show that a number of known iterative probing methods, which are based on the assumption of first-come first-serve scheduling, can be expected to report the fair bandwidth share of a new flow rather than the available bandwidth. Our measurement results confirm this view and we conclude that under the current probe gap and probe rate models the fair share can only be loosely related to the available bandwidth. Like a few other studies we report that packet sizes have a tremendous impact on bandwidth estimates. Unlike these studies we can, however, show that minor modifications to known methods for wired networks, such as Pathload, can solve previously indicated limitations of these methods in wireless networks.

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Section: Introductionmentioning

confidence: 99%

A Measurement Study of Bandwidth Estimation in IEEE 802.11g Wireless LANs Using the DCF

Bredel

Fidler

2008

NETWORKING 2008 Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet

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“…For throughput measurement, the proposed scheme adopted two different set values for s ta and s tb , including 8 bytes of UDP header + 20 bytes of IP header + 14 bytes of MAC header, to be used as s t in the compound probes. Considering the critical packet sizes of the compound probe over the path configurations in Figure 6, with s h = 1500 bytes and an IEEE 802.11g link, we selected s ta = 1392 bytes and s tb = 1492 bytes, respectively, for the single-hop scenario, determined by (6), and s ta = 288 bytes and s tb = 388 bytes, respectively, for the multiple-hop scenario, determined by (5). Each probing train consisted of 100 compound probes, which we have found to be a suitable number through experimentation, inter-spaced with a constant interval of 100 ms. We used the same number of probing packets in the WBest measurements.…”

Section: Resultsmentioning

confidence: 99%

“…In a node i, if the transmission time of P h on the output link L i+1 of node i is smaller than the Scheme for Throughput Measurement 1 : Set s h = Path MTU 2 : Set s t = s tb , where s tb is determined from (5) or (6) 3 : Send compound probes with s h and s t 4 : Get the smallest intra-packet gap G min (s tb ) 5 : Set s t = s ta , where s ta < s tb 6 : Send compound probes with s h and s t 7 : Get the smallest intra-packet gap G min (s ta ) 8 : Get the average intra-packet gap G avg (s ta ) 9 : Calculate the capacity c n ,…”

Section: B Sizing Probing Packets To Ensure Zero-dispersion Gapmentioning

confidence: 99%

“…However, the intra-packet gap might be affected by cross traffic and heterogeneous link capacities of the wired segment of a hybrid wired-wireless path (Figure 2). Existing schemes based on intra-packet gap [3], [4] and end-to-end delay [1], [5] require that the wireless access link constitute the bottleneck link (i.e., the link with the smallest available bandwidth) of a hybrid wired-wireless path to measure the throughput of the wireless link. If this condition is not satisfied, the accuracy of the schemes may decrease because the probing packets may undergo dispersion created by a bottleneck link located on the wired segment before reaching the wireless access point (AP).…”

Section: Introductionmentioning

confidence: 99%

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Active Scheme to Measure Throughput of Wireless Access Link in Hybrid Wired-Wireless Network

Salehin

Rojas‐Cessa

2012

IEEE Wireless Commun. Lett.

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Abstract-In this letter, we propose an active scheme to measure the download throughput of an IEEE 802.11 wireless access link in a hybrid wired-wireless network. The proposed scheme is based on sending pairs of probing packets to a wireless end host to determine the smallest and average intra-packet gaps of the probing packets that are used for the estimation of the constant dispersion gap that wireless access creates. We present experimental evaluations of the proposed scheme, and the obtained results show that the proposed scheme achieves high measurement accuracy. Furthermore, we show that the proposed scheme is able to work under the presence of cross traffic along the path.

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“…Recent literature related to bandwidth measurement in wireless networks [3,5,25] has reported that existing tools that aim at measuring the available bandwidth are not accurate. Many of these measuring tools have been designed following the rate response model of the FIFO queue.…”

Section: Introductionmentioning

confidence: 99%

Impact of transient CSMA/CA access delays on active bandwidth measurements

Portolés-Comeras

Cabellos‐Aparicio

Mangues‐Bafalluy

et al. 2009

Proceedings of the 9th ACM SIGCOMM Conference on Internet Measurement

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WLAN devices based on CSMA/CA access schemes have become a fundamental component of network deployments. In such wireless scenarios, traditional networking applications, tools, and protocols, with their built-in measurement techniques, are usually run unchanged. However, their actual interaction with the dynamics of underlying wireless systems is not yet fully understood. A relevant example of such built-in techniques is bandwidth measurement. When considering WLAN environments, various preliminary studies have shown that the application of results obtained in wired setups is not straightforward. Indeed, the contention for medium sharing among multiple users inherent to CSMA/CA access schemes has remarkable consequences on the behavior of and results obtained by bandwidth measurement techniques. In this paper, we focus on evaluating the effect of CSMA/CA-based contention on active bandwidth measurement techniques. As a result, it presents the rate response curve in steady state of a system with both FIFO and CSMA/CA-based contending cross-traffic. We also find out that the distribution of access delay shows a transient regime before reaching a stationary state. The duration of such transient regime is characterized and bounded. We also show how dispersion-based measurements that use a short number of probing packets are biased measurements of the achievable throughput, the origin of this bias lying on the transient detected in the access delay of probing packets. Overall, the results presented in this paper have several consequences that are expected to influence the design of

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An Analysis of Active End-to-end Bandwidth Measurements in Wireless Networks

Cited by 14 publications

References 10 publications

A Measurement Study of Bandwidth Estimation in IEEE 802.11g Wireless LANs Using the DCF

A Measurement Study of Bandwidth Estimation in IEEE 802.11g Wireless LANs Using the DCF

Active Scheme to Measure Throughput of Wireless Access Link in Hybrid Wired-Wireless Network

Impact of transient CSMA/CA access delays on active bandwidth measurements

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