Albert Banchs

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The upcoming new standard IEEE 802.11e aims at providing Quality of Service (QoS) support in 802.11 Wireless LANs. While the QoS mechanisms in 802.11e, namely the EDCF and the HCF, have already been defined in the standard draft, the challenge lies in the configuration of these mechanisms in order to provide the desired services. In this paper, we deal with(More)
One of the main challenges with 802.11e EDCA is the configuration of the open parameters of this mechanism, namely AIFS, CWmin, CWmax and TXOP_limit. In this paper, we address the issue of finding the optimal configuration of these parameters in order to maximize the throughput performance of the WLAN. We first present a model to analyze the throughput(More)
Software Defined Networking (SDN), characterized by a clear separation of the control and data planes, is being adopted as a novel paradigm for wired networking. With SDN, network operators can run their infrastructure more efficiently, supporting a faster deployment of new services while enabling key features such as virtualization. In this article, we(More)
1 Some examples are the work in the IETF MEXT WG (http:// www.ietf.org/html.charters/mext-charter.html), the extension by the ETSI Technical Committee Railways Telecommunications (http://portal.etsi.org/rt/su mmary_06.asp) of the original global system for mobile communicationsrailway (GSM-R) standard to benefit from the evolution of the GSM technology, or(More)
Under heterogeneous radio conditions, Wireless LAN stations may use different modulation schemes, leading to a heterogeneity of bit rates. In such a situation, 802.11 DCF allocates the same throughput to all stations independently of their transmitting bit rate; as a result, the channel is used by low bit rate stations most of the time, and efficiency is(More)
A thorough understanding of the power consumption behavior of <i>real world</i> wireless devices is of paramount importance to ground energy-efficient protocols and optimizations on realistic and accurate energy models. This paper provides an in-depth experimental investigation of the per-frame energy consumption components in 802.11 Wireless LAN devices.(More)