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Crowdsourced WiFi community network enables individual users to form a community and share their private home WiFi access points (APs) with each other, hence can provide a much higher WiFi coverage for each user. In this work, we consider a novel crowdsourced WiFi network model, which allows users to join the community in different roles: (a) Contributor, who contributes to the community by sharing...
Document scanning is a daily office work. However, traditional devices like flatbed scanners are not easy to carry for mobile work. In this paper, we present a new document image scanning method using a mobile device. With a clip of continuous video capturing, our approach first extracts several key-frames. A mobile GPU based image stitching method is adopted to generate a high resolution document...
Understanding the characteristics of spectrum utilization is essential in providing guidelines for resource allocation. In this paper, a detailed measurement analysis of spectrum efficiency is performed, with data collected from tens of thousands of base stations during fifteen months. We examine the characteristics of radio resource margins (RM) extensively, including its temporal skewness, diurnal...
this paper presented a new spatial and temporary correlation model under arbitrary scattering scenario in mobile network, and derived a general close-form expression by series expansion. Numerical results show that if the angle spread is large or the incidence angle is perpendicular to mobile direction, the correlation of received signal power will decrease rapidly. These numeric results are useful...
Recently, the automatic frequency planning which is mainly based on interference matrix (IM) is widely used in global system for mobile communications (GSM) networks planning. Most IM generation algorithms are derived from the Mobile Measurement Reports (MMRs) received from mobile users. Since the number of bits used for MMRs is limited and the MMRs could only provide the power level of six neighboring...
Guarantee of QoS (quality of service) and mobility management are important research areas in NGN (next generation networks). Most people have been taking a route of mobile IP over MPLS (MIoM) to meet such challenge. However, MIoM has a drawback considering that MPLS itself does not have any direct control over transmission at the physical layer, instead, it has to rely on existing data link layer...
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