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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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Journal ArticleDOI
TL;DR: The market and technological perspectives for SONs are introduced and a self-booting mechanism for a newly added evolved NodeB without a dedicated backhaul interface is illustrated, and mobility load balancing as one of the most important selfoptimization issues for Long Term Evolution networks is discussed.
Abstract: With the rapid growth of mobile communications, deployment and maintenance of cellular mobile networks are becoming more and more complex, time consuming, and expensive. In order to meet the requirements of network operators and service providers, the telecommunication industry and international standardization bodies have recently paid intensive attention to the research and development of self-organizing networks. In this article we first introduce both the market and technological perspectives for SONs. Then we focus on the self-configuration procedure and illustrate a self-booting mechanism for a newly added evolved NodeB without a dedicated backhaul interface. Finally, mobility load balancing as one of the most important selfoptimization issues for Long Term Evolution networks is discussed, and a distributed MLB algorithm with low handover cost is proposed and evaluated.

226 citations

Journal ArticleDOI
TL;DR: This paper proposes to utilize mobility for joint energy replenishment and data gathering in general networks with random topologies and proposes a distributed algorithm to adjust data rates at which sensors send buffered data to the SenCar, link scheduling and flow routing so as to adapt to the up-to-date energy replenishing status of sensors.
Abstract: Recent years have witnessed the rapid development and proliferation of techniques on improving energy efficiency for wireless s`ensor networks. Although these techniques can relieve the energy constraint on wireless sensors to some extent, the lifetime of wireless sensor networks is still limited by sensor batteries. Recent studies have shown that energy rechargeable sensors have the potential to provide perpetual network operations by capturing renewable energy from external environments. However, the low output of energy capturing devices can only provide intermittent recharging opportunities to support low-rate data services due to spatial-temporal, geographical or environmental factors. To provide steady and high recharging rates and achieve energy efficient data gathering from sensors, in this paper, we propose to utilize mobility for joint energy replenishment and data gathering. In particular, a multi-functional mobile entity, called SenCar in this paper, is employed, which serves not only as a mobile data collector that roams over the field to gather data via short-range communication but also as an energy transporter that charges static sensors on its migration tour via wireless energy transmissions. Taking advantages of SenCar’s controlled mobility, we focus on the joint optimization of effective energy charging and high-performance data collections. We first study this problem in general networks with random topologies. We give a two-step approach for the joint design. In the first step, the locations of a subset of sensors are periodically selected as anchor points, where the SenCar will sequentially visit to charge the sensors at these locations and gather data from nearby sensors in a multi-hop fashion. To achieve a desirable balance between energy replenishment amount and data gathering latency, we provide a selection algorithm to search for a maximum number of anchor points where sensors hold the least battery energy, and meanwhile by visiting them, the tour length of the SenCar is no more than a threshold. In the second step, we consider data gathering performance when the SenCar migrates among these anchor points. We formulate the problem into a network utility maximization problem and propose a distributed algorithm to adjust data rates at which sensors send buffered data to the SenCar, link scheduling and flow routing so as to adapt to the up-to-date energy replenishing status of sensors. Besides general networks, we also study a special scenario where sensors are regularly deployed. For this case we can provide a simplified solution of lower complexity by exploiting the symmetry of the topology. Finally, we validate the effectiveness of our approaches by extensive numerical results, which show that our solutions can achieve perpetual network operations and provide high network utility.

225 citations

Patent
23 Jun 2009
TL;DR: In this article, the authors proposed a mobile communication method in which a mobile station performs a handover from a handoff source radio base station to a hand over target radio BS, which includes the steps of acquiring, at the handover target radio base stations, from a switching center, a key for calculating a first key for generating a certain key used in a communication between the target radio station and the mobile station.
Abstract: The present invention relates to a mobile communication method in which a mobile station performs a handover from a handover source radio base station to a handover target radio base station. The mobile communication method includes the steps of: (A) acquiring, at the handover target radio base station, from the handover source radio base station or a switching center, a key for calculating a first key for generating a certain key used in a communication between the handover target radio base station and the mobile station; and (B) acquiring, at the handover target radio base station, from the switching center, a second key for calculating a first key for generating a certain key used in a communication between a next handover target radio base station and the mobile station.

225 citations

Proceedings ArticleDOI
02 Jun 2012
TL;DR: This paper wants to investigate new research directions on mobile applications testing automation, by answering three research questions by analyzing the current state of the art in mobile applications development and testing, and by proposing the view on the topic.
Abstract: While mobile applications are becoming so extraordinarily adopted, it is still unclear if they deserve any specific testing approach for their verification and validation. This paper wants to investigate new research directions on mobile applications testing automation, by answering three research questions: (RQ1) are mobile applications (so) different from traditional ones, so to require different and specialized new testing techniques?, (RQ2) what are the new challenges and research directions on testing mobile applications?, and (RQ3) which is the role automation may play in testing mobile applications?. We answer those questions by analyzing the current state of the art in mobile applications development and testing, and by proposing our view on the topic.

224 citations

Proceedings ArticleDOI
22 May 2011
TL;DR: This survey paper provides a concise overview of mobile network security, attack vectors using the back end system and the web browser, but also the hardware layer and the user as attack enabler.
Abstract: We are currently moving from the Internet society to a mobile society where more and more access to information is done by previously dumb phones. For example, the number of mobile phones using a full blown OS has risen to nearly200% from Q3/2009 to Q3/2010. As a result, mobile security is no longer immanent, but imperative. This survey paper provides a concise overview of mobile network security, attack vectors using the back end system and the web browser, but also the hardware layer and the user as attack enabler. We show differences and similarities between "normal" security and mobile security, and draw conclusions for further research opportunities in this area.

224 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
202351
2022149
2021339
2020558
2019707