Addressing the Effects of Low Vehicle Densities in Highly Mobile Vehicular Named-Data Networks

In this work, we investigate the effects of network partitions, caused by low vehicle densities, on the performance of Vehicular Named- Data Networking (VNDN) applications. We target scenarios with high mobility and propose two different solutions. For cases with infrastructure support, we present the idea of VNDN agent delegation. For this approach, we develop a VNDN communication mechanism for Road Side Units (RSUs), we deploy it in RSUs along roads, and delegate content retrieval to these VNDN enabled RSUs. For cases with lack of infrastructure support, we propose a new solution called VNDN store carry forward (VNDN-SCF). In VNDN-SCF, we develop a new store-carry- forward mechanism for VNDN message retransmissions by vehicles, in the case of network partitions occurrence. Simulation results show that both solutions are scalable and efficient for mitigating the negative effects on communication links between vehicles, caused by low vehicle densities and high speeds simultaneously. Besides, our solutions also avoid the well-known problems of broadcast storms and message redundancy and address the effects of reverse path partitioning

Receiver Mobility in Vehicular Named Data Networking

This work investigates the topic of Vehicular Named Data Networking (VNDN). We propose a new VNDN routing protocol and address the negative effects caused by receiver mobility. In particular, we identify the problem of Reverse Path Partitioning (RPP) that often prevents Data messages from reaching Content Requesters, degrading application performance. To mitigate RPP we propose a novel mechanism named as Auxiliary Forwarding Set (AFS). AFS takes several mobility factors as inputs and extends the NDN core philosophy by identifying an extra set of eligible nodes to forward Data messages whenever retransmissions are required due to RPP. Simulation results show that AFS is an efficient and scalable solution to improve VNDN application performance regardless of receiver mobility

A low cost mHealth non-intrusive method to monitoring patient indoor Localization

The development of efficient mechanisms for detecting health issues in patients as early as possible is very welcome since the probability of positive outcomes from treatments increases if the health problem is detected on its early stages. On the other hand, many health issues can even be avoided if the condition of risk is detected before the patient start suffering from the disease. In this work, we propose a novel, efficient and low cost solution for indoor monitoring of patients for medical purposes based on Wi-Fi signal strength intensities and mobile computing. The output of our solution consist of reports containing the patterns of room occupation by patients inside home. These reports will allow health care professionals to detect changes on the behavior of patients that can be interpreted as early signs of health related issues. The proposed solution was implemented in an Android smartphone and tested in a real scenario. To assess our solution, 10 monitoring periods with the duration of approximately one hour each, were performed at different times. During each monitoring period, 40 random points were selected as measuring points and 391 correct detections out of 400 possible were reached, corresponding to an average effectiveness of 97.75%.13826682673COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESSem informaçã

SDN Coordination for CCN and FC Content Dissemination in VANETs

Content dissemination in Vehicular Ad-hoc Networks has a myriad of applications, ranging from advertising and parking notifications, to traffic and emergency warnings. This heterogeneity requires optimizing content storing, retrieval and forwarding among vehicles to deliver data with short latency and without jeopardizing network resources. In this paper, for a few reference scenarios, we illustrate how approaches that combine Content Centric Networking (CCN) and Floating Content (FC) enable new and efficient solutions to this issue. Moreover, we describe how a network architecture based on Software Defined Networking (SDN) can support both CCN and FC by coordinating distributed caching strategies, by optimizing the packet forwarding process and the availability of floating data items. For each scenario analyzed, we highlight the main research challenges open, and we describe a few possible solutions

A multi-pronged approach to adaptive and context aware content dissemination in VANETs

Content dissemination in Vehicular Ad-hoc Networks (VANETs) has the potential to enable a myriad of applications, ranging from advertising, traffic and emergency warnings to infotainment. This variety in applications and services calls for mechanisms able to optimize content storing, retrieval and forwarding among vehicles, without jeopardizing network resources. Content Centric Networking (CCN), takes advantage of inherent content redundancy in the network in order to decrease the utilization of network resources, improve response time and content availability, coping efficiently with some of the effects of mobility. Floating Content (FC), on the other hand, holds potential to implement efficiently a large amount of vehicular applications thanks to its property of geographic content replication, while Software Defined Networking (SDN), is an attractive solution for the lack of flexibility and dynamic programmability that characterizes current VANET architectures. By implementing a logical centralization of the network, SDN enables dynamic and efficient management of network resources. In this paper, for a few reference scenarios, we illustrate how approaches that combine CCN, FC and SDN enable an innovative adaptive VANET architecture able to efficiently accommodate to intermittent connectivity, fluctuating node density and mobility patterns on one side and application performance and network resources on the other side, aiming to achieve high QoS. For each scenario, we highlight the main open research challenges, and we describe possible solutions to improve content dissemination and reduce replication without affecting content availability