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Understanding the mobile user flow flux patterns is important for numerous applications relevant to crowd movement, from information sharing, networking, to security and public health. Particularly in instances of smart buildings and hospitals, among others, the flow between indoor locations, and mobility modeling within buildings is of a prime significance. Much of the mobility modeling studies have...
The Magnetic Induction (MI)-based communication techniques enable the applications of wireless sensor networks (WSNs) in complex environments, such as underground and underwater environments. However, the complex environments usually consist of many conductive objects that can significantly enhance or block the MI signals. Efficient communications can be achieved if we can smartly utilize the positive...
This paper presents the deployment of a working Wireless Underground Sensor Network (WUSN) on a university campus using existing wireless networking technology at 902 MHz. This is the first full system of its kind that is operational over a long time, with the data being gathered available in real time on an open website. Design details of the WUSN are described, including the network architecture,...
Challenged Networks (CNs) are characterized by frequent varying network conditions and intermittent connectivity. In general, CNs emerge in different scenarios including the disaster and emergency situations when the traditional cellular infrastructure is dysfunctional or unavailable as well as in the undeserved areas such as rural and developing regions. This paper aims to evaluate the performance...
In this poster, we consider software-defined wireless sensor networks (SDWSNs) and present a lightweight flow management to reconfigure flow entries in flow-table when link fault occurs in the data plane of SDWSNs.
In opportunistic mobile networks (OppNets), nodes should be in listening state to discover the neighbors for opportunistic message forwarding. While in OppNets, contacts between nodes are sparse, most of nodes' energy is consumed in idle listening state, which highlights the need for energy saving in contact probing. Duty cycle operation can be applied to address this problem. However, it may cause...
Greater unlicensed access to spectrum has the potential to increase competition among wireless service providers and encourage innovations by lowering barriers to entry. However, early providers offering service in such a band could create new entry barriers through the use of contracts that impose a penalty on customers who switch to a new provider. This paper discusses cases in which an exclusive...
Active queue management (AQM) is broadly accepted as the tool of choice for tackling bufferbloat (the accumulation of large queueing delays) in network buffers. CoDel and PIE are considered two of the most promising AQM schemes, but little has been done to adopt them in cellular networks, which are particularly plagued by bufferbloat. This is partly due to the lack of adequate evaluation of their...
Mobile edge computing (MEC) provides a promising way to bring enhanced computing capabilities in proximity to user equipments (UEs). Various previous works have been done and they usually focus on how to segment the computation intensive task and how to offload the task to edge of the network with plenty of computation capacity. However, few of them consider integrating MEC with small cell networks...
With significant increases in mobile device traffic slated for the foreseeable future, numerous technologies must be embraced to satisfy such demand. Notably, one of the more intriguing approaches has been blending on-device caching and device-to-device (D2D) communications. While various past research has pointed to potentially significant gains (30%+) via redundancy elimination (RE), some skepticism...
Over the past few years, many major wireless providers restricted their unlimited data plans and replaced them with limited-size fixed-price data packages. While this could be perceived as a disadvantage for customers, it helps the cellular wireless providers to reduce the traffic intensity at their base stations. Then the lower traffic intensity leads to a better service quality and higher rates...
Recently, wireless caching techniques have been studied to satisfy lower delay requirements and offload traffic from peak periods. By storing parts of the popular files at the mobile users, users can locate some of their requested files in their own caches or the caches at their neighbors. In the latter case, when a user receives files from its neighbors, device-to-device (D2D) communication is enabled...
This paper presents novel techniques to achieve high-rate ultrasonic communications through thick metallic barriers utilizing ultrasound and provides a characterization and analysis of a 7 × 7 MIMO-OFDM acoustic-electric channel array and determines that, due to unique channel properties yielding well-conditioned channel gain matrices, a slowly adaptive crosstalk mitigation structure achieves near-optimal...
Burst communications in a wideband environment subject to Doppler, multipath, and noise is challenging. An example is the Underwater Acoustic (UWA) channel. Compared to the over-the-air radio frequency (RF) channel, the UWA channel is subject to severe distortions due to Doppler as well as multipath. The challenge of interest is wideband burst communications in such an environment. Thereto the effect...
In this paper, we study the energy-efficient resource allocation in software-defined mobile networks with mobile edge computing and caching. With the introduction of caching and computing functions in mobile networks, content sources need to be selected according to the distribution of contents in caches, the capability of computational resources and the status of networks. Moreover, the network needs...
With the tremendous volume explosion of big data video contents in future wireless networks, ensuring Quality of Experience (QoE) of the End User (EU) by leveraging communication context becomes an important issue. In this paper, we propose a context-aware wireless multimedia relay solution to incentivize user devices participating in wireless relay services. In this proposed approach, QoE and price...
Wireless network virtualization is an emerging paradigm to improve spectrum utilization by sharing wireless resources through slicing. In this paper, we investigate interactions between mobile virtual network operators (MVNOs) and users as a Stackelberg game. We leverage wireless virtualization while creating MVNOs that provide wireless coverage by subleasing the frequencies from owners of wireless...
Geometry-based stochastic model (GBSM) of multiple input multiple output (MIMO) channel describes the channel impulse response (CIR) in the sense of rays and clusters, which obey the empirical distributions. Thus, the correlation between MIMO sub-channels is not explicitly defined, which makes it difficult for GBSM to predict channel capacity accurately. Facing the increased antenna number of massive...
The demand for indoor positioning and navigation is increasing exponentially in recent years. When more international students and visitors come to the university campus for study and academic activities, wireless indoor positioning and navigation by smartphones becomes a truly welcomed service. We propose a hybrid system by utilizing iBeacon within the Wi-Fi network with fingerprint technique, to...
In the horizontal atmospheric turbulent channel of optical wireless communication (OWC), anisotropy has been proved to be one of essential properties. This paper investigates the long term beam spread and the beam wander of Gaussian beam based on the generalized anisotropic non-Kolmogorov power spectrum, where all the influence of the anisotropy of turbulence, the finite turbulence inner and outer...
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