VoIPiggy: Implementation and evaluation of a mechanism to boost voice capacity in 802.11WLANs

Salvador, Pablo; Gringoli, Francesco; Mancuso, Vincenzo; Serrano, Pablo; Mannocci, Andrea; Banchs, Albert

doi:10.1109/infcom.2012.6195732

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…Indeed, in this section we report how the new mechanisms can be implemented over existing COTS hardware, using the existing open-source firmware OpenFWWF that has been used in the past to implement other extensions for 802.11 [7,8].…”

Section: Implementing Gatsmentioning

confidence: 99%

A first implementation and evaluation of the IEEE 802.11aa group addressed transmission service

Salvador

Cominardi

Gringoli

et al. 2013

SIGCOMM Comput. Commun. Rev.

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The IEEE 802.11aa Task Group has recently standardized a set of mechanisms to efficiently support video multicasting, namely, the Group Addressed Transmission Service (GATS). In this article, we report the implementation of these mechanisms over commodity hardware, which we make publicly available, and conduct a study to assess their performance under a variety of real-life scenarios. To the best of our knowledge, this is the first experimental assessment of GATS, which is performed along three axes: we report their complexity in terms of lines of code, their effectiveness when delivering video traffic, and their efficiency when utilizing wireless resources. Our results provide key insights on the resulting trade-offs when using each mechanism, and paves the way for new enhancements to deliver video over 802.11 Wireless LANs.

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Section: Implementing Gatsmentioning

confidence: 99%

A first implementation and evaluation of the IEEE 802.11aa group addressed transmission service

Salvador

Cominardi

Gringoli

et al. 2013

SIGCOMM Comput. Commun. Rev.

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“…This article extends [1] very substantially, by introducing an analytical model for its performance (capacity region and voice delay), and a much more thorough experimental evaluation.…”

Section: Related Workmentioning

confidence: 99%

“…In contrast, VoIPiggy achieves a substantially more efficient operation using a very simple scheme. 1 It is also worthwhile noting that HCCA has not been widely deployed, while here we present a working implementation of VoIPiggy.…”

Section: Related Workmentioning

confidence: 99%

VoIPiggy: Analysis and Implementation of a Mechanism to Boost Capacity in IEEE 802.11 WLANs Carrying VoIP Traffic

Salvador

Mancuso

Serrano

et al. 2014

IEEE Trans. on Mobile Comput.

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Abstract-Handling voice traffic in existing WLANs is extremely inefficient, due to the large overhead of the protocol operation as well as the time spent in contention. In this paper, we propose a simple scheme (VoIPiggy) to improve the efficiency of WLANs with voice traffic. The key idea of the mechanism is to piggyback voice frames onto the MAC layer acknowledgments, which reduces both the frame overhead and the time wasted in contention. To quantify the gains of our proposal, we first study its performance by means of a capacity and delay analysis of a WLAN operating under the VoIPiggy mechanism. Then, we present an implementation of the mechanism using commercial off-the-shelf devices, which involves programming at the driver and firmware levels. The performance of the proposed scheme is evaluated in a large-scale testbed consisting on 30 devices. Our extensive measurements, which comprise different network conditions in terms of number of active nodes, traffic load and transmission rates, confirm that the experimental results match the analytical ones, and show a dramatic performance improvement for both "voice only" and "voice and data" scenarios.

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“…This microcode replaces the proprietary Broadcom image and allows direct control of all medium access, decoding, and encoding operations subject to some (humble) hardware constraints due to the microcontroller's original purpose. Similarly to [5,28] we altered the receive path in the assembly code and compiled the jammer's functionality in our own microcode that would be run directly on the NIC.…”

Section: Jammer Hardware and Implementationmentioning

confidence: 99%

Gaining insight on friendly jamming in a real-world IEEE 802.11 network

Berger

Gringoli

Facchi

et al. 2014

Proceedings of the 2014 ACM Conference on Security and Privacy in Wireless &Amp; Mobile Networks

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Frequency jamming is the fiercest attack tool to disrupt wireless communication and its malicious aspects have received much attention in the literature. Yet, several recent works propose to turn the table and employ so-called friendly jamming for the benefit of a wireless network. For example, recently proposed friendly jamming applications include hiding communication channels, injection attack defense, and access control. This work investigates the practical viability of friendly jamming by applying it in a real-world network. To that end, we implemented a reactive and frame-selective jammer on a consumer grade IEEE 802.11 access point. Equipped with this, we conducted a three weeks real-world study on the jammer's performance and side-effects on legitimate traffic (the cost of jamming) in a university office environment. Our results provide detailed insights on crucial factors governing the trade-off between the effectiveness of friendly jamming (we evaluated up to 13 jammers) and its cost. In particular, we observed - what we call the power amplification phenomenon - an effect that aggravates the known hidden station problem when the number of jammers increases. However, we also find evidence that this effect can be alleviated by collaboration between jammers, which again enables effective and minimally invasive friendly jamming

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VoIPiggy: Implementation and evaluation of a mechanism to boost voice capacity in 802.11WLANs

Cited by 4 publications

References 7 publications

A first implementation and evaluation of the IEEE 802.11aa group addressed transmission service

A first implementation and evaluation of the IEEE 802.11aa group addressed transmission service

VoIPiggy: Analysis and Implementation of a Mechanism to Boost Capacity in IEEE 802.11 WLANs Carrying VoIP Traffic

Gaining insight on friendly jamming in a real-world IEEE 802.11 network

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