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In this paper, we introduce the problem of road condition surveillance using a mobile vehicle as a concrete practical application of data collection paradigm on a direct path in energy harvesting wireless sensor networks (EH-WSNs). The application components together with its associated challenges are discussed throughout the paper. An optimization model is introduced for the network throughput maximization...
Most of the concerns of interest to mobile ad hoc networks (MANETs) are of interest in vehicular ad hoc networks (VANETs), but the details differ. Rather than moving at random, vehicles tend to move in an organized path. The intercommunication with roadside equipment can likewise be characterized fairly accurately. And finally, most vehicles are prohibited in their range of motion, for example by...
The DSRC/WAVE system is standardized to disseminate safety critical information using IEEE 802.11p as a MAC protocol. Studies show that IEEE 802.11p does not address adverse effects of asymmetric radio link and mobility related problems in vehicle to vehicle (V2V) and vehicle to infrastructure (V2I) communications. This paper presents a cross-layer (i.e. MAC and network) algorithm to address these...
One of the major drawbacks for mobile nodes in wireless networks is power management. Our goal is to evaluate the performance power control scheme to be used to reduce network congestion, improve quality of service and collision avoidance in vehicular network and road safety application. Some of the importance of power control (PC) are improving spatial reuse, and increasing network capacity in mobile...
The Mobile Wi-Fi system using Mobile Access Points (M-APs) is a new and effective method for vehicles to access the Internet service. This paper presents an analytic model to evaluate several handoff algorithms for using M-APs in vehicular networks. The analytic results show that the best handoff strategy depends on factors such as M-AP availability or connection duration.
IEEE 802.11 PHY supports multiple transmission rates, varying from as low as 1 Mbps in 802.11b, up to 54 Mbps in 802.11g, and higher in 802.11n, with each Wi-Fi station selecting its transmission rate according to its own algorithm. The per-packet fairness scheme adopted by the 802.11 MAC reduces the effective throughput to that of the lowest sending rate. In multi-vehicle opportunistic downloading...
In this paper, we propose a group handover scheme in heterogeneous vehicular networks, which seeks to not only maximize system throughput but also make sure the load of all candidate access networks are maintained at the target load level. With mobility prediction information, we formulate the handover scheme as a multi-assignment problem, and develop an auction-based method to solve such problem...
When many cellular users take high capacity transit (HCT), a group of mobile terminals (MTs) may have to initiate handoffs and location updates more or less at the same time, which will cause congestion on the random access control channel (RACH), leading to many handoff and location update failures. To overcome this problem, we propose a new scheme, called GHA/RALU (Group Handoff Avoidance/Rate Adjusted...
An efficient medium access control (MAC) protocol should yield maximum throughput and fairness. However, because these two performance metrics have conflicting interests, an effective solution must address the trade-off between them. In this paper, we study the performance of the IEEE 802.11p MAC protocol in vehicle-to-infrastructure communications. The main focus is the trade-off between the system...
This paper investigates into a special type of network that encourages cooperation between its upper layer social network and lower layer wireless communication network with particular focus on commuters on the road. Regarded as a branch of mobile social networks, the so-called vehicular social network (VSNs) proposed in this paper needs to consider both social aspects (such as social ties through...
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)...
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,...
Vehicular ad hoc networks (VANETs) applied to specific scenarios are kinds of opportunistic networks. Introducing currently opportunistic routing protocols and actual VANETs characteristics, the paper proposed an opportunistic routing protocol based on the comprehensive utilities of forwarding nodes. The protocol conducted a dimensionless method to deal with these factors including the distance between...
Intelligent Transportation Systems (ITS) have been under development since the 80's as part of a global strategy for solving many of our modern life transportation problems. These systems enable people to reach their destinations in a safe, efficient, and comfortable way. In order to reach that goal, several radio access technologies (RAT) such as UMTS, WiFi, WiMAX and 5.9 GHz have been proposed for...
This paper proposes new MAC layer based back-off and retransmission strategies for throughput enhancement, in broadcast transmissions of inter vehicular communication. We present adaptive back off strategy which is based on the concept that there exists an optimum contention window (CW) period in a broadcast CSMA/CA system, given the fixed number of users. We also propose a simple probabilistic approach...
In this paper we model the data traffic congestion scenario in a vehicular ad-hoc network, and we apply the Adaptive PI Rate Controller (APIRATE) to deal with the congestion. Derived from classical control theory, the APIRATE controller performs AQM (Active Queue Management) by controlling the source rate based on the instantaneous queue length of the congested node. We then study the performance...
Inter-vehicle communication (IVC) network has become an important topic in research for its potential advantages in enhancing traffic security and efficiency. This paper investigates the communication performance of IVC networks in two lane bidirectional traffic streams. By changing the transmission range of communication units and penetration rate of equipped vehicles, we studied several performance...
The advanced wireless technologies make vehicle-to-vehicle communication possible. However, vehicular network has a limitation in terms of network topology rapidly change, which causes discontinuous connection. To support seamless connection, horizontal and vertical handovers are required. The good handover mechanism should take network parameters, user requirements, and application QoS into account...
Next generation heterogeneous networks require an effective handover scheme, optimized specially to support network mobility. The paper proposes an architecture to support seamless mobility of mobile networks across heterogeneous networks. We consider the vehicular scenario where a vehicle is provided with mobility through different Internet service providers (ISPs) and propose to use multiple mobile...
This paper deals with alternative automotive networks involved by the X-by-wire and X-tainment applications. New market demands like navigation, multimedia, security, safety and individualized options introduce more and more electronic control units. Furthermore, the automotive industry has to face a great challenge in its transition from mechanical engineering towards mechatronical products. In the...
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