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- Taka Sakurai, Hai Le Vu
- IEEE Trans. Wireless Communications
- 2007

The MAC access delay in a saturated IEEE 802.11 DCF wireless LAN is analyzed. We develop a unified analytical model and obtain explicit expressions for the first two moments as well as the generating function. We show via comparison with simulation that our model accurately predicts the mean, standard deviation, and distribution of the access delay for a… (More)

- Zvi Rosberg, Hai Le Vu, Moshe Zukerman, Jolyon White
- IEEE Journal on Selected Areas in Communications
- 2003

This paper provides a scalable framework for analysis and performance evaluation of optical burst-switching (OBS) networks. In particular, a new reduced load fixed point approximation model to evaluate blocking probabilities in OBS networks is introduced. The model is versatile enough to cover known OBS reservation policies such as just-enough-time,… (More)

- Hai Le Vu, Eric W. M. Wong, Zvi Rosberg, Syed Murtaza H. Bilgrami
- 2005

This paper provides new loss models for a hybrid optical switch (HOS) combining optical circuit switching (OCS) and optical burst switching (OBS). Exact blocking probabilities are computed when 1) no priority is given to either circuits or bursts and 2) circuits are given preemptive priority over bursts. Because it is difficult to exactly compute in… (More)

- Zvi Rosberg, Hai Le Vu, Moshe Zukerman, Jolyon White
- INFOCOM
- 2003

This paper provides a framework for analysis and performance evaluation of Optical Burst Switching (OBS) networks. In particular, a new reduced load fixed point approximation model to evaluate blocking probabilities in OBS networks is introduced. The model is versatile enough to cover known OBS reservation policies such as Just-Enough-Time (JET),… (More)

- Hai Le Vu, Taka Sakurai
- IEEE Communications Letters
- 2006

We derive the access delay generating function of the IEEE 802.11 DCF protocol. Our analysis corrects a model recently presented in [6]. We demonstrate that numerical transform inversion can be used to efficiently obtain values of the distribution. Simulations show that our analytical results are highly accurate.

- Feng Shu, Taka Sakurai, Moshe Zukerman, Hai Le Vu
- IEEE Communications Letters
- 2007

Transmission of the acknowledgement frame after a packet reception is optional in the IEEE 802.15.4 standard. Considering a set of sensor nodes, each of which has a packet to transmit at the beginning of an active period, we provide an analysis that yields the packet loss statistics of the nonacknowledgement mode of the standard. The analysis is based on a… (More)

- Dongxia Xu, Taka Sakurai, Hai Le Vu
- IEEE Transactions on Mobile Computing
- 2009

We analyze the MAC access delay of the IEEE 802.11e EDCA mechanism under saturation. We develop a detailed analytical model to evaluate the influence of all EDCA differentiation parameters, namely AIFS, CWmin, CWmax and TXOP limit, as well as the backoff multiplier beta. Explicit expressions for the mean, standard deviation and generating function of the… (More)

A comprehensive energy model for wireless sensor networks is provided by considering seven key energy consumption sources some of which are ignored by currently available models. We demonstrate the importance of using such a comprehensive model by comparing it to other existing energy models in terms of the lifetime of a sensor node. We use our model to… (More)

- Md. Imrul Hassan, Hai Le Vu, Taka Sakurai
- IEEE Trans. Vehicular Technology
- 2011

In this paper, we evaluate and improve the performance of the medium access control (MAC) protocol for safety applications in a dedicated short range communication (DSRC) environment. We first develop an analytical model to study the IEEE 802.11 distributed coordination function (DCF) MAC protocol that has been adopted by the IEEE 802.11p standard for DSRC.… (More)

- Hai Le Vu, Sammy Chan, Lachlan L. H. Andrew
- IEEE Trans. Vehicular Technology
- 2010

The IEEE 802.16 standard is a promising technology for the fourth-generation mobile networks and is being actively promoted by the Worldwide Interoperability for Microwave Access (WiMAX) Forum: an industry-led consortium. Among the various service classes supported in the standard, best-effort service is expected to be the major service class subscribed to… (More)