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When analyzing competition in telecommunication markets it is fundamental to take into account their specific characteristics. Moreover, it is important to understand the temporal evolution of competition as a result of multiple contextual factors. For these reasons the present study analyzes competition in mobile telecommunications, measured through the Lerner Index, and explains its evolution through...
In this paper, a planar 4-port antenna is designed to investigate the effect of user finger for mobile terminal application. The proposed array antenna covers a bandwidth of 2.5 GHz centered at 28 GHz. The effects of user's finger on the antenna are studied in four different positions on top of antenna elements, with six distances between antenna and user's finger. The losses due to the increased...
Mobile devices now rival desktop computers as a method of web browsing. Even so, many web applications are still designed with the desktop setting in mind. As screen sizes of mobile devices continue to get larger, operating smartphones single-handedly becomes increasingly difficult. This paper explores the possibility of automatic operating hand detection by capturing users' touch traces during normal...
This paper presents a conceptual framework for co-design (by multidisciplinary team) Location-based Mobile Learning Applications. Four stages are identified related with this kind of applications: conceptual design, development cycle, put into practice and evaluation. This paper is focus on the first stage, the conceptual design. For this stage, relevant features are described. In particular, good...
Nowaday, mobile crowdsensing (MCS) is widely used in mobile devices, and one of the key challenges is how to motivate users to provide sensing services. In this paper, we explore the sensing task allocation in a MCS environment in which requester aims to maximize the valuation of tasks with limited budget. According to the multi-parameter bids of users including sensing costs and available time, we...
Caching contents at base stations (BSs) has emerged as an effective way to offload backhaul traffic and improve quality of experience (QoE). Considering the limited cache size, how to maximize cache efficiency has become an urgent issue to be addressed. In this paper, we consider caching selected contents at small cell base stations (SBSs) in ultra dense network (UDN). The cache efficiency problem...
In previous work we have demonstrated that Virtual Reality can be used to help train driving skills for users of a powered wheelchair. However, cybersickness was a particular problem. This work-in-progress paper presents a Mixed Reality alternative to our wheelchair training software, which overcomes this problem. The design and implementation of this application is discussed. Early results shows...
Multiple IFoF has long been a promising method to provide a high bandwidth efficient solution to connect remote radio unit and baseband unit pool in C-RAN architecture. To obtain stable performance, it is desirable to make frequency conversion and multiplexing in digital way, which makes ADC/DAC inevitable. In this work, we study the quantization noise and sampling jitter effect upon multi-IFoF system,...
Multifunctional information system for long remote monitoring and correction of the health state of people with the use of the advanced mobile communications, intelligent medical gadgets (navigators) and mobile applications for health control is proposed.
This article focuses on the utilization of a mobile robot as data mule for collecting and transferring data from a ground wireless sensor system (WSN). For the case, where the nodes' communication is impeded either due to a non-connected node, or due to excessive retransmissions caused by significant packet losses, the effective transmission rate is reduced and the energy consumption for the RF-communication...
Dynamic Adaptive Streaming over HTTP (DASH), as one of the main video transmission technologies, has been widely concerned. However, due to the unstability of wireless environment and the restrictions of mobile networks, it is challenging to deliver DASH-based videos in LTE systems and enhance the performance of Quality of Experience (QoE). In this paper, a problem is formulated to maximize the sum...
Mobile web interaction using multiple modalities such as speech, gesture and touch is a well-researched area with examples of multiple framework deployments within the domain. Here, we explore usage of semantics of web content as a new modality for mobile web content discovery and navigation. In addition to semantics-based interactivity, the framework enables dynamic cross-language switching between...
As a major branch of LBSs, geosocial networking services become popular. An important functionality of geosocial networking services is allowing people to find potential friends who have similar profile within close proximity and initiate communication with each other. However, in order to realize this functionality, most existing services require mobile users to reveal their profiles and location...
Cloud radio access network (C-RAN) is deemed as a promising architecture to meet the exponentially increasing traffic demand in mobile networks, where baseband processing is separated from remote radio heads (RRHs) and performed in a centralized baseband unit (BBU) pool. However, the densely deployed RRHs, as well as the passive optical network which provides high capacity backhauls between the RRHs...
We study mobile user behavior from cell-level location trace (CLLT). Since CLLT contains no GPS coordinates of mobile users, we infer approximate user locations from the cell locations they visit. We build upon the vast literature on user behavior analysis and demonstrate the ability to extract user behavior in the absence of the more precise GPS information. We focus on the “leisure time” behavior,...
Mobile devices are increasingly presented with multiple connectivity options, including WiFi hotspots, micro-/macro-cells or even other devices in device-to-device (D2D) communications. By and large, connectivity management for mobile devices has primarily focused on contention, congestion and wireless medium conditions. In this paper, we assess the role of information-centrism in mobile device connectivity...
In this paper, a novel multi-bit simultaneous query technique, called the Coherent Analog Bloom Filter (CABF), is proposed for wireless networks. CABF allows the Access Point (AP) of the network to gather multiple bits of key information from nodes in the network simultaneously, such as the identities of the active nodes and the data packet sizes. With CABF, the nodes transmit signals on selected...
With ability to eliminate the cliff effect and achieve graceful degradation, analog-like transmission such as SoftCast has become a hot research issue for robust image/video delivery over wireless channels. However, it has not been well studied in the case of bandwidth compression, which usually occurs in bandwidth-constrained wireless environments such as satellite communication scenarios. In this...
We present MAP, a contention-free MAC protocol for fast and reliable multi-hop data dissemination in vehicular ad hoc networks which takes advantage of two-packet collisions to improve network capacity. MAP addresses both the problem of unwanted collisions due to hidden nodes in CSMA/CA-based networks, and the problem of excessive control messages in dense TDMA-based vehicular networks. MAP operation...
Looking into the concept of next-generation (5G) cellular systems, it is necessary to do a revision of existing radio spectrum management techniques and come up with more flexible solutions. A new wave of spectrum policy reforms can be envisaged with a direction shift from static to dynamic optimization. According to the peak hours, the number of served users in mobile networks is increasing. Since...
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