Topic
Mobile telephony
About: Mobile telephony is a research topic. Over the lifetime, 38008 publications have been published within this topic receiving 553646 citations.
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TL;DR: An innovative mobile video search system through which users can discover videos by simply pointing their phones at a screen to capture a very few seconds of what they are watching, aiming at instant and progressive video search by leveraging the light-weight computing capacity of mobile devices.
Abstract: The proliferation of mobile devices is producing a new wave of applications that enable users to sense their surroundings with smart phones. People are preferring mobile devices to search and browse video content on the move. In this paper, we have developed an innovative mobile video search system through which users can discover videos by simply pointing their phones at a screen to capture a very few seconds of what they are watching. Different than most existing mobile video search applications, the proposed system is aiming at instant and progressive video search by leveraging the light-weight computing capacity of mobile devices. In particular, the system is able to index large-scale video data using a new layered audio-video indexing approach in the cloud, as well as generate lightweight joint audio-video signatures with progressive transmission and perform progressive search on mobile devices. Furthermore, we showcase that the system can be applied to two novel applications—video entity search and video clip localization. The evaluations on the real-world mobile video query dataset show that our system significantly improves user’s search experience due to search accuracy, low retrieval latency, and very short recording duration.
101 citations
TL;DR: A new "mobile host" WSN paradigm is presented that utilizes nodes that are deployed without resident power and operate on a mechanical memory principle, and is the first field demonstration of a mobile host wireless sensor network.
Abstract: Wireless sensor networks (WSNs) for structural health monitoring (SHM) applications can provide the data collection necessary for rapid structural assessment after an event such as a natural disaster puts the reliability of civil infrastructure in question. Technical challenges affecting deployment of such a network include ensuring power is maintained at the sensor nodes, reducing installation and maintenance costs, and automating the collection and analysis of data provided by a wireless sensor network. In this work, a new "mobile host" WSN paradigm is presented. This architecture utilizes nodes that are deployed without resident power. The associated sensors operate on a mechanical memory principle. A mobile host, such as a robot or unmanned aerial vehicle, is used on an as-needed basis to charge the node by wireless power delivery and subsequently retrieve the data by wireless interrogation. The mobile host may be guided in turn to any deployed node that requires interrogation. The contribution of this work is the first field demonstration of a mobile host wireless sensor network. The sensor node, referred to as THINNER, capable of collecting data wirelessly in the absence of electrical power was developed. A peak displacement sensor capable of interfacing with the THINNER sensor node was also designed and tested. A wireless energy delivery package capable of being carried by an airborne mobile host was developed. Finally, the system engineering required to implement the overall sensor network was carried out. The field demonstration took place on an out-of-service, full-scale bridge near Truth-or-Consequences, NM.
101 citations
TL;DR: In this article, an energy-efficiency optimized power allocation (EEOPA) algorithm is proposed to improve the energy efficiency of MIMO-OFDM mobile multimedia communication systems, where all subchannels are classified by their channel characteristics.
Abstract: It is widely recognized that, in addition to the quality-of-service (QoS), energy efficiency is also a key parameter in designing and evaluating mobile multimedia communication systems, which has catalyzed great interest in recent literature. In this paper, an energy-efficiency model is first proposed for multiple-input–multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) mobile multimedia communication systems with statistical QoS constraints. Employing the channel-matrix singular value decomposition (SVD) method, all subchannels are classified by their channel characteristics. Furthermore, the multichannel joint optimization problem in conventional MIMO-OFDM communication systems is transformed into a multitarget single-channel optimization problem by grouping all subchannels. Therefore, a closed-form solution of the energy-efficiency optimization is derived for MIMO-OFDM mobile multimedia communication systems. As a consequence, an energy-efficiency optimized power allocation (EEOPA) algorithm is proposed to improve the energy efficiency of MIMO-OFDM mobile multimedia communication systems. Simulation comparisons validate that the proposed EEOPA algorithm can guarantee the required QoS with high energy efficiency in MIMO-OFDM mobile multimedia communication systems.
101 citations
Patent•
25 Apr 1990
TL;DR: In this paper, a system for mobile communication includes a number of base stations 10, 13, 16, 20, 23, 26, 30, 31, 45 and 46 with users 30,31, 45, and 46.
Abstract: A system for mobile communication includes a number of base stations 10, 13, 16, 20, 23, 26 with users 30, 31, 45 and 46. Associated with each base station is an interface unit 10a, 13a, 16a, 20a, 23a and 26a which packetises voice information and includes header information concerning user and destination addresses. These interface units tracks the movement of the various user by passing control blocks from interface unit to interface unit. Packets are routed via routing block 40 or 41 and switches 50-52. The stored information within the base station interfaces allows movement from one base station to allow to be handled without call loss.
101 citations
01 Jan 2009
TL;DR: The use of mobile phone in the banking industry, its economic implications, and in general a s ystematic look into the various forms of mobile banking with emphasis on the security measures that makes the whole process safe for adoption is discussed in this article.
Abstract: Globally, vari ous initiatives use the mobile phone to pr ovide financial services to t hose with or without access to traditional banks. This paper outlined vividly the use of mobile phone in the banking industry, its economic implications, and in general a s ystematic look into the various forms of mobile banking with emphasis on the security measures that makes the whole process safe for adoption. The emergence of mobile banking technology systems has implications for the general discussions about mobile telephony in the developing world. Existing theory about the significance of mobile communications in the developing world has focused on voice and text messaging. Moreso, the emergence of mobile banking also underscores how, occasionally, innovations emerge fr om unexpected places and have the capabil ity of reconfiguring the significance of a technology to its users, offering a way to lower the costs of moving money from place to place and opening a way to bring more users into contact with formal financial systems.
101 citations