One of the key factors for the wide acceptance and deployment of IEEE 802.11 Wireless Local Area Networks (WLANs) is the simplicity and robustness of the Medium Access Control (MAC) protocol. Based on the well-known carrier sense paradigm, with an exponential backoff mechanism devised to minimize the probability of simultaneous transmission attempts by multiple stations, the protocol is able to...

The IEEE 1609.4 for Wireless Access in Vehicular Environment (WAVE) network is designed to support both safety applications (e.g., emergency service) and non-safety applications (e.g., data service) for Intelligent Transportation System (ITS). The Wave operates on multi-channels consisting of one control channel (CCH) and 6 service channels (SCHs). In this paper, we propose and analyze a MAC pr...

A significant challenge in the design of biomimetic scaffolds is combining morphologic, mechanical, and biochemical cues into a single construct to promote tissue regeneration. In this study, we analyzed the effects of different crosslinking conditions on fibrin biopolymer microthreads to create morphologic scaffolds with tunable mechanical properties that are designed for directional cell guid...

The brain-computer-interfaces (BCI) can also be referred towards a mindmachine interface that provide non-muscular communication channel in between the computer device and human brain. To measure brain activity, electroencephalography (EEG) has been widely utilized applications of BCI to work system real-time. It analyzed identification probability performed with other methodologies do not opti...

In the advent of emerging information super highway, voice over Internet Protocol has become a vital service with the demand for high quality of requirements in Wireless Local Area Network(WLANs). The IEEE 802.11e Standard has been recently introduced to mark the Quality of Service (QoS) competence in the ever evolving wireless local area networks. This 802.11e brings contention window, based o...

In this paper, we derive, based on the analytical model developed by Cali et al., a multi-class model to study how to adaptively tune all the parameters in IEEE 802.11e EDCA and support service differentiation in WLANs. Through analytical modeling, we demonstrate that by assigning appropriate different transmission probabilities (or contention window sizes) to stations of different classes, it ...

We extend the modeling heuristic of (Harsha et al. 2006. In IEEE IWQoS ’06, pp 178 – 187) to evaluate the performance of an IEEE 802.11e infrastructure network carrying packet telephone calls, streaming video sessions and TCP controlled file downloads, using Enhanced Distributed Channel Access (EDCA). We identify the time boundaries of activities on the channel (called channel slot boundaries) ...

Cross-layer design is a promising direction and challenging issue for quality delivery of multimedia over wireless networks. This article proposes a cross-layer design which can substantially enhance the transmission quality of video streaming over 802.11e ad hoc networks. The proposed design consists of two parts: a dispersive video frame importance (DVFI) scheme in the application layer that ...

IEEE 802.11e standard defines two Medium Access Control (MAC) functions to support Quality of Service (QoS) for wireless local area networks: Enhanced Distributed Channel Access (EDCA) and HCF Controlled Channel Access (HCCA). EDCA provides fair prioritized QoS support while HCCA guarantees parameterized QoS for the traffics with rigid QoS requirements. The latter shows higher QoS provisioning ...

One of the challenges that must be overcome to realize the practical benefits of ad hoc networks is quality of service (QoS). However, the IEEE 802.11 standard, which undeniably is the most widespread wireless technology of choice for WLANs and ad hoc networks, does not address this issue. In order to support applications with QoS requirements, the upcoming IEEE 802.11e standard enhances the or...