A performance evaluation framework for IEEE 802.11 ad-hoc networks

Ng, Ping Chung; Liew, Soung Chang; Jiang, Li

doi:10.1145/1023756.1023781

Cited by 8 publications

(10 citation statements)

References 1 publication

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“…16 For the interested reader, reference [19] showed that the carrier-sensing mechanism of 802.11 may impose a constraint on channel spatial-reuse that is overly restrictive, making the network performance non-scalable. The same paper also provides a scheme that modifies 802.11 slightly to achieve scalable performance.…”

Section: Numerical Resultsmentioning

confidence: 99%

Throughput Analysis of IEEE802.11 Multi-Hop Ad Hoc Networks

Liew

2007

IEEE/ACM Trans. Networking

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Abstract-In multi-hop ad hoc networks, stations may pump more traffic into the networks than can be supported, resulting in high packet-loss rate, re-routing instability and unfairness problems. This paper shows that controlling the offered load at the sources can eliminate these problems. To verify the simulation results, we set up a real 6-node multi -hop network. The experimental measurements confirm the existence of the optimal offered load. In addition, we provide an analysis to estimate the optimal offered load that maximizes the throughput of a multi-hop traffic flow. We believe this is a first paper in the literature to provide a quantitative analysis (as opposed to simulation) for the impact of hidden nodes and signal capture on sustainable throughput. The analysis is based on the observation that a large-scale 802.11 network with hidden nodes is a network in which the carrier-sensing capability breaks down partially. Its performance is therefore somewhere between a carrier-sensing network and an Aloha network. Indeed, our analytical closed-form solution has the appearance of the throughput equation of the Aloha network. Our approach allows one to identify whether the performance of an 802.11 network is hidden-node limited or spatial-reuse limited.

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Section: Numerical Resultsmentioning

confidence: 99%

Throughput Analysis of IEEE802.11 Multi-Hop Ad Hoc Networks

Liew

2007

IEEE/ACM Trans. Networking

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238

222

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“…This is because Rj has begun the reception of Si's DATA at the physical layer, even though it is not targeted for Rj (usually called "receiver capture"). Similar argument applies for (7).…”

Section: 11-carrier Sensing Constraintsmentioning

confidence: 57%

“…However, the 802.11 carrier sensing may fail to achieve either in some situations. A detailed analysis is given in [7]. HFD will ensure (i) (HN-free), but not (ii) (Exposed Node-Free).…”

Section: 11-carrier Sensing Constraintsmentioning

confidence: 99%

“…Since each "atomic information exchange" over an 802.11 link consists of two-way traffic, DATA followed ACK in the reverse direction, the condition for the two transmissions not interfering with each other are as follows [7]:…”

Section: No-collision Constraintsmentioning

confidence: 99%

“…The first inequality on the left says that the DATA signal on link j should be sufficiently small when it reaches the receiver of link i compared with the DATA signal on link i; the second inequality on the left is for DATA on link j not interfering with ACK on link i; and so on [7].…”

Section: No-collision Constraintsmentioning

confidence: 99%

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Removing hidden nodes in IEEE 802.11 wireless networks

Jiang¹,

Liew

VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005.

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Abstract--This paper investigates the hidden-node phenomenon (HN) that arises in IEEE 802.11 wireless networks. HN can cause many performance problems, including throughput degradation, unfair throughput distribution among flows, and throughput instability. Previous investigations mostly focus on methods to alleviate these performance problems rather than direct elimination of HN. Such an approach may solve one but not all of these problems. This paper is a first attempt to identify the fundamental conditions leading to HN. In particular, we show that HN arises fundamentally as a result of the 802.11 protocol constraints. Based on the insight obtained from the analysis, we devise a Hidden-node-Free Design (HFD) that completely removes HN. Readers who are only interested in the results, but not the derivations, may skip Section 3.

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Power interference modeling for CSMA/CA based networks using directional antenna

Kandasamy

Morla

Ricardo

2016

Computer Communications

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In IEEE 802.11 based wireless networks adding more access points does not always guarantee an increase of network capacity. In some cases, additional access points may contribute to degrade the aggregated network throughput as more interference is introduced. This paper characterizes the power interference in CSMA/CA based networks consisting of nodes using directional antenna. The severity of the interference is quantized via an improved form of the Attacking Case metric as the original form of this metric was developed for nodes using omnidirectional antenna.The proposed metric is attractive because it considers nodes using directional or omnidirectional antenna, and it enables the quantization of interference in wireless networks using multiple transmission power schemes. The improved Attacking Case metric is useful to study the aggregated throughput of IEEE 802.11 based networks; reducing Attacking Case probably results in an increase of aggregated throughput. This reduction can be implemented using strategies such as directional antenna, transmit power control, or both.

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A performance evaluation framework for IEEE 802.11 ad-hoc networks

Cited by 8 publications

References 1 publication

Throughput Analysis of IEEE802.11 Multi-Hop Ad Hoc Networks

Throughput Analysis of IEEE802.11 Multi-Hop Ad Hoc Networks

Removing hidden nodes in IEEE 802.11 wireless networks

Power interference modeling for CSMA/CA based networks using directional antenna

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