The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Localization methods play an increasing role in many of today's Intelligent Transportation Systems (ITS). In the context of this work we concentrate on improving the localization accuracy of passengers in public transport vehicles, e.g. as part of automated registration, counting or ticketing systems. In these applications each passenger's ticket could be designed as a mobile wireless sensor node,...
For indoor network positioning, the ranging error modeling plays an important role in positioning algorithm optimization, simulation setup, system parameters calibration, performance evaluation and test-bed configuration, etc. However, the error model is commonly assumed as a Normal distribution or other distributions which cannot capture the negative value, the positive bias and the right-side tail...
We consider the sleep mode algorithm of IEEE 802.16e mobile networks where a mobile station may switch off the transceiver and go into sleep mode in order to save power. Depending on the underlying application, different algorithms are defined in the standard. In practice, a hybrid combination of the sleep mode algorithms will be used in a mobile. In this paper, we build a novel performance model...
This paper presents a performance study for the effects of attenuation and interference on cellular mobile systems. UAE terrain examples are chosen to perform the numerical analysis and simulation which is based on Okumura-Hata and ITU-1546 propagation models. Simulation results presented demonstrate the effect of different terrain on the field strength, as well as the effect of co-channel and adjacent...
IP multimedia subsystem (IMS) realizes the convergence of fixed and mobile networks. In virtue of providing various types of multimedia services among different kinds of access networks, IMS is considered as the core network for future next generation networks. For detecting the requested services quickly and efficiently, it is necessary for IMS to adopt a valid service discovery function. In this...
Location dependent information services (LDISs) are gaining increasing popularity in recent years. Due to limited client power and intermittent connectivity, caching is an important approach to improve the performance of LDISs. In this paper, we propose a new replacement policy called location dependent cooperative caching (LDCC). Unlike existing location dependent cache replacement policies, the...
Delay/disruption tolerant networks (DTNs) or intermittently connected mobile networks (ICNs) are mobile ad hoc networks where end-to-end multi-hop paths may not exist and communication routes may only be available through time and mobility. While most of the research is dedicated to the design of routing protocols, very few properties of such networks are known. In a recent paper [6], the authors...
This paper presents a survey of current methods of detecting black hole attack against ad hoc on-demand distance vector routing protocol in mobile ad hoc networks. In a black hole attack, a malicious node answers each route request with a fake reply claiming to have the shortest and freshest route to the destination. However, when the data packets arrive, the malicious node discards them. Seven detection...
We developed a quality of service (QoS) management system to support service level management (SLM) for global enterprise services. The QoS management system is integrated with one of our enterprise services in a preproduction system, an identical system as the production system but in a test environment. Lab experiments showed that our integrated solution helps global enterprise services to better...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.