Search results for "MOBILITY"
showing 10 items of 922 documents
Information Exchange in Mobile Encounter Network
2007
In this paper we analyze an information exchange method based on information diffusion in mobile encounter networks, a form of mobile peer-to-peer networks. We utilize dual mobility model which provides support for more realistic simulations compared to mobility models based only one method of movement. The distribution of the mobile device encounter intervals are discussed and analyzed via simulation runs. The logistic model is suggested to provide reasonably accurate estimates of the information diffusion process.
Modeling of mobility and groups in inter-vehicular MANET-based networks
2007
This paper evaluates the behavior of mobile ad hoc networks when group mobility is involved. We concentrate on group mobility because road vehicles tend to form groups or fleets whose behavior depends on the behavior of the close-by vehicles. We propose four different group mobility models and present a mobility pattern generator, called grcmob that we designed to be used with the ns-2 simulator. We evaluate the performance of vehicular ad hoc networks under a wide number of scenarios using both TCP and UDP data traffic. We show that the number of groups is more important than the number of nodes and that the impact of area size is almost negligible. We also reveal that the mixture of inter…
A Highly Flexible Trajectory Model Based on the Primitives of Brownian Fields—Part I: Fundamental Principles and Implementation Aspects
2015
A fundamental drawback of synthetic mobility models is that the spatial configuration of the path is determined by the temporal features of the mobile station (MS), such as its speed. This is, however, not true in reality. This first part of our paper establishes a new approach for generating fully spatial random trajectory (mobility) models to which different speed scenarios can be applied. We employ the new approach to the proposal of a highly flexible trajectory model based on the primitives (integrals) of Brownian fields (BFs). We construct a drifted partial random bridge from a given starting point to a random terminating point in the 2D plane. If the bridge is partially established, a…
MCMIPv6: Multicast Configuration-based Mobile IPv6 protocol
2010
International audience; Mobile IPv6 (MIPv6) and its basic extension for network mobility NEMO were initially designed to manage the mobility of device users and networks respectively while maintaining a permanent IP address. Nevertheless, the different MIPv6's experiments have shown many lacks in case of high mobility of nodes such as in vehicular networks. To overcome these lacks, many solutions have been proposed by the research community. The most famous ones are HMIPv6 and FMIPv6 tackling each a specific issue. On the one hand, FMIPv6 introduces a solution to effectively minimize the L2/L3 latency and avoid the packets losses during the handover procedure. On the other hand, HMIPv6 is e…
Group mobility impact over TCP and CBR traffic in mobile ad hoc networks
2004
We present an analysis of the effect that mobility models have over the performance of a mobile ad hoc network. We concentrate on group mobility because there is a growing attention on the development and evaluation of MANET's approach applied to personal area networks (PANs), especially based on Bluetooth technology. We investigate the effect that the mobility model has on the performance of CBR traffic and TCP traffic. We propose four different group mobility models and describe a mobility pattern generator called grcmob to be used with the ns-2 simulator. We perform a thorough evaluation of a MANET behavior using as a reference the behavior obtained with the random waypoint mobility mode…
Network Connectivity and Area Coverage for UAV Fleet Mobility Model with Energy Constraint
2016
International audience; Our main focus through the present paper is on developing an original distributed mobility model for autonomous fleet of interconnected UAVs (Unmanned Aerial Vehicles) performing an area exploration mission. The UAVs, equipped with wireless ad-hoc capabilities, are required to optimally explore an area while maintaining connectivity with their neighboring UAVs and the base station. Because energy is a scarce resource, especially for UAVs, its wise management is quite beneficial for the network lifetime and mission success. Hence, the proposed mobility model, compared to other models in the literature, is the first to ever include the remaining energy level as decisio…
Effects of Mobility Programmes on University Students' Academic Performance
2018
The number of students participating in mobility programmes has increased enormously over the years. The reasons are diverse and may range from personal growth to better employability prospects, together with improvement in foreign language skills and intercultural awareness. Mobility programmes receive generous funding from the European Commission, therefore their outcomes should be measured and evaluated. This paper focuses on a specific one: the academic effects of mobility programmes. We analyse whether there is an improvement in the academic performance of the students who participate in mobility programmes and, if this is the case, whether it is sustained over time. We use a broad dat…
Reti per la mobilità e struttura sociale dello spazio urbano: una rappresentazione multidimensionale dei cambiamenti in corso a Palermo
2017
Incidendo su varie dimensioni dello sviluppo sostenibile, le reti per la mobilità stanno acquisendo un ruolo sempre più centrale nei processi di rigenerazione delle aree urbane, divenendo così oggetto di crescenti attenzioni da parte dei governi locali. Ciò impone che si producano nuove capacità di formulare strategie integrate in grado di cogliere il nesso tra reti, ambiente costruito, spazio pubblico e struttura socio-economica delle città, così come accrescere le capacità cognitive degli attori locali, producendo letture più dinamiche ed attualizzate del cambiamento sociale verso il quale orientare le future scelte di pianificazione della mobilità sostenibile. Rispetto a questa premessa,…
The mobility and the job success of the Sicilian graduates
2018
The paper focuses on the job success of Sicilians Graduates comparing people who remain in Sicily for work reasons (Stayers) and who moves from Sicily to another Italian region or abroad (Movers) during 2016. Data referred to the Almalaurea Consortium annual survey collecting data of first and second level graduates interviewed at one, three or five years from graduation. We model the probability to be a successful graduate by means of a logistic regression model considering job and curriculum characteristics. The results show that many factors influence the job success, with some differences between graduates interviwed 1 or 5 years after graduation, but it is clear that to be a Mover incr…
Reshaping the Urban Environment Through Mobility Projects and Practices: Lessons from the Case of Palermo
2016
Transport and mobility are crucial factors in the process of adaptation of contemporary urban areas to the challenge of sustainable development. In this perspective, however, cities need to perform a more effective integration between a wide range of different policies and planning practices. Together with a more effective integration between transport policy and land-use planning, for instance, cities could take growing advantage by organisational factors, as well as the spreading of new technologies and the related processes of social innovation. Through the description of several project and planning initiatives taking place in Palermo, the fifth Italian city, this paper attempts to expl…