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Today's mobile computing environments aggregate many entities, all of them with a number of internal sensors, processing applications and other, user given information that can be shared with others over the available networks. Tomorrow's ubiquitous computing environments, where the number of sensors is assumed to be even significantly higher, face the challenge that information exchange between entities...
There is an urgent need of effective trust management for vehicular ad-hoc networks (VANETs), given the dire consequences of acting on false information sent out by malicious peers in this context. In this paper, we first discuss the challenges for trust management caused by the important characteristics of VANET environments. We then survey existing trust models in multi-agent systems, mobile ad-hoc...
In this paper, we study the connectivity of a Vehicular Ad hoc Network (VANET) formed between vehicles that move on a highway. Analytical model to determine the network connectivity of VANET is presented, assuming that the speed of vehicles follow normal distribution. We bring out the exact dependence of vehicle speed statistics on VANET connectivity. We also present the dependence of vehicle speed...
Tracking mobile targets is an important wireless sensor network application in both military and civilian fields. Often, it may be necessary for sending additional resources to the vicinity of the mobile target. In such a scenario, it is pertinent to provide continuous guidance to the friendly resource moving towards the mobile target. This paper presents a mechanism for the guidance of a friendly...
Traffic safety applications relying on cooperative systems are currently being considered by several research projects worldwide. An important question is if existing wireless technologies can meet the communication requirements from this emerging field of applications? Part of the answer to this question is that the communication requirements depend on what is actually communicated and how this information...
This paper proposes a method for the IP layer link aggregation using flow information to use all available mobile interfaces for backbone network access simultaneously in a vehicle mobile router. For this purpose, we present the design of the IP layer link aggregation functionality and the design of the aggregator which is the essential part of the IP layer link aggregation functionality. In the proposed...
The concept of providing an on-line car pooling service to facilitate matching of drivers and riders has been around for a while. A number of systems or trials have also been built for use in university campuses or on-line communities. These systems however are quite restrictive in terms of the quality of matches and flexibility of pick-up/drop-off places, routes and schedules. Capitalizing on the...
The dynamical network topology is the source of most challenges in VANETs (Vehicle Ad hoc Networks). In urban area, however, it is feasible to meet the challenge by taking advantage of the heavy traffic. This paper proposes a location aware virtual infrastructure (LAVI) based on recognition memory. Combining the memory of past cooperation with the location information, the mobile nodes can construct...
Mobile WiMAX is a burgeoning network technology with diverse applications, one of them being used for VANETs. The performance metrics such as Mean Throughput and Packet Loss Ratio for the operations of VANETs adopting 802.16e are computed through simulation techniques. Next we evaluated the similar performance of VANETs employing 802.11p, also known as WAVE (Wireless Access in Vehicular Environment)...
This standard specifies the electronic payment service layer and profile for Payment and Identity authentication, and Payment Data transfer for Dedicated Short Range Communication (DSRC) based applications in Wireless Access in Vehicular Environments. This standard defines a basic level of technical interoperability (vehicle-to-roadside) for electronic payment equipment, i.e., onboard unit (OBU) and...
In recent years, vehicular networks have been widely studied because these networks become an important part of wireless metropolitan networks. This type of wireless network is different from other conventional wireless mobile networks since the mobile nodes in the networks usually have high speed, sufficient power and dynamic topology. In vehicular networks, vehicles can connect with access points,...
In Proxy Mobile IPv6 (PMIPv6), any involvement by the Mobile Node (MN) is not required so that any tunneling overhead could be removed from over-the-air. However, during the PMIPv6 handover process, there still exists a service interruption period during which the MN is unable to send or receive data packets because of PMIPv6 protocol operations. To reduce the handover latency, Fast Handover for PMIPv6...
In this paper we consider the problem of high accuracy localization of mobile nodes in a multipath-rich environment where sub-meter accuracies are required. We employ a peer to peer framework where the vehicles/nodes can get pairwise multipath-degraded ranging estimates in local neighborhoods together with a fixed number of anchor nodes. The challenge is to overcome the multipath-barrier with redundancy...
The worldwide Digital Signage market has been getting increasingly popular in recent years. Nevertheless, for service providers, the Digital Signage business is still not easy to manage and time-consuming to operate. In this paper, based on the GPS and wireless infrastructure, we present a mobile location-aware digital signage system (LDSS). Through the centralized system architecture, the applications...
In this paper, we consider the problem of disseminating data in Infrastructure-to-Vehicular (I2V) networks. In particular, given a fixed Road Side Unit (RSU) we evaluate the maximum amount of data that can be reliably transferred from the RSU to the vehicles passing in its proximity through a recently proposed multihop probabilistic broadcasting protocol, namely Irresponsible Forwarding (IF). In particular,...
To restore the performance of the system due to the failure of a BS, we propose a hybrid vehicular communication system which introduces a novel double cluster head (DCH) routing scheme. Using vehicular traces from loop Ids on the M4 motorway in the UK, the performance of the system is evaluated and compared with the single cluster head (SCH) routing scheme under different configurations. Even though,...
This paper introduces a platform for realistic and computationally efficient online vehicular networks simulation. It permits decentralized traffic management applications simulation as nodes mobility is modifiable at runtime thanks to the integration of two state-of-the-art network and traffic simulators. The platform embeds a tool that generates vehicular traces based on traffic counting data and...
Since resources are scarce and cannot be compensated easily on the battlefield, resource planning and battlefield management should be performed to reserve as much resources as possible. However, most resource planning problems encountered on the battlefield are computationally intractable. Therefore, no exact solution can be found when the battlefield size is large-scale. Hence we designed and implemented...
Cooperative awareness is established by vehicles exchanging their status frequently. In situations where a high number of vehicles access the communication channel with high frequency, communication and cooperative awareness suffer from increased packet loss. So far, forwarding of beacons focuses on extending the range of V2V communication which is not necessarily needed in most scenarios. In this...
Technology advances in both computations and wireless communications have made it economically feasible for manufacturers to collect data from all the cars in order to monitor their operations and detect any potential problems. However to make this a reality requires a new architecture that can effectively handle vehicle mobility, intermittent connectivity, and data security, as well as scale to large...
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