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In wireless mobile networks quality of user experience changes dynamically and depends on large variety of factors. Because of that mobile operators are willing to timely and effectively evaluate provided Quality of Service (QoS) in their networks. Nowadays the main tool for monitoring network state and performance is drive testing. To replace this expensive and mostly manual procedure, concept of...
The performance of heterogeneous networks (Het-Nets) is strongly affected by inter-cell interference. Instead of relying on coordination among base stations, this study presents a new receiver block that identifies the precoders assigned to active users in an adjacent cell. Equipped with this proposed active precoder identification (API), the inter-cell interference at the receiver becomes feasible...
Mobile phone technology continuously evolves and incorporates more and more sensors for enabling advanced applications. The availability of these sensors in mass-market communication devices creates exciting new opportunities for data mining applications. Particularly healthcare applications exploiting build-in sensors are very promising. These devices open wide range of opportunities of using their...
Global motion estimation (GME) is an important technique in video processing, segmentation, and compression. In this correspondence, we propose a GME algorithm that offers improved accuracy especially in the presence of large-scale zoom. The proposed algorithm is derived from the observation that there exists an ambiguity between translation and zoom for simple geometric shapes such as lines, which...
We introduce the Wordometer, a novel method to estimate the number of words a user reads using a mobile eye tracker and document image retrieval. We present a reading detection algorithm which works with over 91 % accuracy over 10 test subjects using 10-fold cross validation. We implement two algorithms to estimate the read words using a line break detector. A simple version gives an average error...
In a mobile environment, text-based passwords are still the most common mechanism for user authentication. Although various studies have been conducted to investigate what password composition policies are better oriented for mobile users, a limited study has been performed to understand the impact of password composition policies and environmental settings to mobile users' password typing abilities...
In this paper, we propose to improve the localization accuracy of mobile tags in a Real-Time Location System (RTLS). Our approach consists of applying three different antennas to achieve pattern and polarization diversity. This solution minimizes several issues such as misaligned antenna polarization, non-uniform radiation pattern and multipath fading. We then demonstrate that our approach can improve...
A big interest in developing commercial LBS (Location Based Services), and also the obligation of mobile network operators to implement emergency call service, have led to the intensive development of techniques for mobile users localization in the last few years. In this paper, three different types of positioning models, based upon utilization of RSS (Received Signal Strength) values from GSM (Global...
In Mobile Wireless Sensor Networks (MWSNs), location information of nodes is the basis of many applications. Compared with that in a static network, the localization issue in a mobile network is more difficult due to uncertainty of node positions, thus much more challenges are brought to MWSNs. In this paper, we propose three localization models to evaluate performances of DV-hop localization algorithm...
Mobile content recommendation system has been widely used to overcome limitation of usability on mobile device for mobile content filtering problem. However, the system faces the problem related to insufficient information in the early stage. This affects the performance of the system in the prediction of mobile content for relevant items for user. There is a Multi-level Targeting Classification Association...
In factory automation contexts, the localization is an important issue to be considered in order to help industrial monitoring processes, at different layers. This paper shows the study of an innovative localization platform, for industrial environments, based on the IEEE 802.11 technology. The platform can be easily implemented inside an existing communication architecture, introducing several Wi-Fi...
A good understanding of the behaviour of the traffic of a mobile network is essential for an efficient planning and management of the mobile network's scarce bandwidth resources. In this paper, we propose a probabilistic approach, called Handoff Time Estimation MODel (HTEMOD), to estimate the time window when a user will perform handoffs along his/her movement/path to a destination. We derive the...
With the ubiquity of WiFi-enabled smartphones, and large-scale access point deployment, WiFi-based localization is one of the most promising indoor localization systems. Existing WiFi localization solutions, however, exhibit high power demand due to the periodic updates required, which raises the barrier for deployment on mobile devices since battery life is a crucial resource. In this paper, we present...
Improvements in underground wireless tracking technology are critical for improved safety and productivity in underground mines. While the recent focus on technology development has been for underground coal mines, improvements are required for block caving operations which have very different characteristics from coal mines. Block caving is characterized by a large number of draw points from which...
New computing paradigms have underscored the need to locate objects in an environment, motivating several object localization approaches targeting competing technologies and specific applications. While RFID technology recently emerged as a viable platform for locating objects, several unresolved key challenges precluded higher performance and wider applicability. We present an RFID-based real-time...
The paper is mainly about positioning and navigation of mobile terminal, and provides a solution of the combination of A-GPS and LF (Location Fingerprint) technology. The solution takes advantages of GPS positioning and CELL-ID positioning, which keep the accuracy and convenience of current technologies and promote coverage for users. Also, energy saving is in detail discussed. By the prediction of...
Location-sensitive information monitoring services are a centerpiece of the technology for disseminating content-rich information from massive data streams to mobile users. The key challenges for such monitoring services are characterized by the combination of spatial and non-spatial attributes being monitored and the wide spectrum of update rates. A typical example of such services is "alert...
Many popular mobile applications require the continuous monitoring and sharing of a mobile user's location. However, exploiting a user's location leads to disclosing sensitive information about the users daily activity. Several location privacy-preserving schemes have been proposed, but it remains challenging for a user to achieve visibility of the associated threats as well as to control the impact...
Positioning in wireless environments is crucial for the continuity of rich and mobile multimedia applications. A good position accuracy is particularly difficult to obtain in indoor or mixed indoor-outdoor scenarios. An efficient positioning system must accurately localize any mobile terminal/user in these demanding environments, being at the same time low-cost and easy to deploy. This paper proposes...
Mobile learning applications support traditional indoor lectures with outdoor activities using mobile devices. An example scenario is a team of students that use triangulation techniques to learn properties of geometrical figures. In previous work, we developed an agent-based mobile learning application in which students use GPS-enabled phones to calculate distances between them. From practical experience,...
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