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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...
Location privacy is one of the Quality of Privacies (QoP) in vehicular ad hoc network (VANET) and imperative for the VANET's full flourish. Frequent pseudonym changing can provide a promising solution to achieve location privacy, however if the pseudonyms are changed in an improper occasion, the solution is ineffective. In this paper, to improve the effectiveness of this kind of solution, we first...
Even though emerging as a promising approach to increase road safety, efficiency and convenience, Vehicular Ad hoc Networks (VANETs) pose many new research challenges, especially on the aspect of location privacy. The existing literatures focus on preventive techniques to achieve location privacy protection, however the location privacy risk assessment receives less attention. In this paper, we introduce...
This paper addresses the downlink scheduling issue in drive-thru networks which is characterized by flow-level dynamics and user basis deadlines. Vehicular users requesting for data download service with variable file sizes regularly arrive at and depart from the limited coverage range of roadside access point. If the corresponding data queue at the access point cannot be serviced in a certain time...
In this paper, we investigate the effects of routing loop, sinkhole, and wormhole attacks on the position-based routing (PBR) in vehicular ad hoc networks (VANETs). We also introduce a new attack termed wormhole-aided sybil attack on PBR. Our study shows that the wormhole-aided sybil attack has the worst impact on the packet delivery in PBR. To ensure the reliability of PBR in VANETs, we propose a...
Wireless vehicular networks have received significant attention. As vehicles are increasingly equipped with onboard sensors, large-scale urban monitoring with vehicular networks becomes attractive. To facilitate better monitoring, it is highly desirable that sensory data of the vehicles can be gathered with high fidelity. Deploying wireless relays is a cost-effective approach for connection enhancement...
Advancements in both on-board and wireless communication technologies provide the necessary backbone for the deployment of a network between vehicles. Most of the envisioned applications for these networks would be greatly favored by multimedia support provisioning. However, there are several issues to be handled in order to provide multimedia services with reasonable quality. In this work, we analyze...
Service-oriented vehicular networks face challenge to deliver delay-sensitive data such as video packets. Most research on video streaming consider network-centric quality of service (QoS) metrics rather than the user perceived quality. In this paper, we propose an application-centric routing framework for real-time video transmission over urban multi-hop vehicular ad-hoc network (VANET) scenarios...
The inherent characteristics of vehicular networks, such as dynamic topology and high mobility, pose significant challenges for the deployment of delay-sensitive applications, e.g., video streaming, in urban Vehicular Ad-hoc Networks (VANET). In this paper, we propose an integrated network-layer scheme for seamless delivery of video packets in VANET. First, we propose a new quality-driven routing...
Adding communication capabilities to vehicles and road infrastructure has become a major goal in the intelligent transportation systems industry. The IEEE 802.11p amendment has specially been conceived for the Wireless Access in Vehicular Environments (WAVE) architecture. In this paper we study the performance of this standard by the means of extensive simulations and we argue that the current version...
Initial works on cooperative vehicular communications build upon the assumption of frequency-flat and quasi-static fading channels. This can be justified only for narrowband systems in very slow traffic flows such as in rush-hours. In this paper, we consider doubly-selective (i.e., time- and frequency-selective) vehicular channels and investigate multipath-Doppler diversity for a cooperative vehicular...
Location service can be used to provide location information of vehicles for various applications including the position-based routing protocols in vehicular ad-hoc networks (VANET). The performance and the overhead of location service in VANET largely depends on the mechanisms to assign the vehicles to the location servers. Utilizing hash functions to determine the location server of a vehicle allows...
In a drive-thru scenario, where vehicles drive by a roadside access point (AP) to obtain temporary Internet access, efficient resource allocation schemes are required to fully utilize the limited communication opportunity. In this paper, we study random access in vehicle-to-roadside (V2R) communications in a dynamic environment, where both the channel contention and capacity vary over time. We consider...
Social-aware data diffusion can improve the dissemination performance in vehicular ad hoc networks (VANETs). However, if some vehicles lie their social claims and vehicle location information is not protected, social-aware data diffusion may not work well. In this paper, to tackle the security and privacy challenges existing in social-aware data diffusion, we propose an efficient vehicle social evaluation...
The emerging vehicular communications will enable a variety of applications for safety, traffic efficiency, driver assistance and infotainment. Due to high vehicular speed, sporadic connection, limited communication range, and large volume of data that need to be transmitted, vehicular communications have the crucial requirements of fast authentication and encryption/decryption. This paper addresses...
A persisting major challenge in Vehicular Delay- Tolerant Networks (VDTNs) is the delay minimization of data delivery when communicating nodes are stationary, arbitrarily deployed along roadsides and considerably apart that they cannot establish direct communication between each other. A source opportunistically releases bundles of data to cooperating vehicles passing by, hoping that they will successfully...
Rapidly repeating the original packet multiple times has been found to improve the probability of successful reception of a packet in error-prone vehicular communication environment. However, since each repetition increases channel load, performance of repetition-based loss recovery starts to deteriorate with increasing number of vehicles on the road. This paper explores the benefit of Network Coding...
Vehicular ad hoc networks have attracted a lot of attention in recent years, in either vehicle-to-vehicle or vehicle-to-infrastructure scenarios. In this paper, we focus on the latter, particularly for vehicles to upload to roadside units, the so-called drive-thru Internet, in a secure and efficient manner. Due to the ad hoc nature and wireless communications, traditional certificate-based security...
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