FRINK Linked Data Fragments server

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• W1566883200 abstract "The DSRC/WAVE initiative is forecast to enable a plethora of applications, categorised in two broad classes of safety and non-safety applications. With the improvement of driver awareness being the primary objective of the safety applications, the performance and hence the users’ satisfaction are driven foremost by the reliability of applications in providing the users with fresh kinematic and warning information about hazardous events. However, due to limited tasks performed in the application layer, the reliability of these applications reduces substantially to the reliability of the underlying communication system. In non-safety applications, on the other hand, many different tasks are performed and decisions are made in the application layer. To gain a holistic view of the impacts of such diverse tasks and decisions on the efficiency of information dissemination as the primary task of these applications, it is required that a comprehensive application framework be designed in the first place. In this dissertation, we adopt a systematic approach to analytically investigate the reliability of the communication system in a symbiotic relationship with the host system comprising a vehicular traffic system and radio propagation environment. To this aim, the interference factor is identified as the central element of the symbiotic relationship. Our approach to the investigation of interference and its impacts on the communication reliability departs from previous studies by the degree of realism incorporated in the host system model. In one dimension, realistic traffic models are developed to describe the vehicular traffic behaviour in urban traffic systems as the major overlooked scenario in the previous studies. In a second dimension, a state-of-theart radio propagation model targeted to vehicular network (VANET) environments is employed to capture the unique signal propagation aspects of the host system. Our key findings are summarised as follows: (i) in urban traffic scenarios, the use of lower data rates in the nominal range stipulated by DSRC/WAVE initiative to fulfil the load demand of applications is questionable, unless the transmission range is controlled effectively, (ii) the worst-case reliability takes place in positions behind the traffic light queue where vehicles are decelerating from high velocity. Such positions are arguably the most important for timely alerting of dangerous traffic conditions, (iii) the hidden terminal interference causes a significant decline in the reachable distance of broadcast safety messages, which in several cases drop to distances shorter than the minimum required coverage of medium range safety applications, and (iv) the hidden terminal interference happens to be the most severe within a short distance from the intersection, implying the likeliness of severe reliability degradation in safety applications targeted to intersection scenarios. This dissertation addresses the case of non-safety applications by proposing a generic framework as a capstone architecture for the development of new applications and the evaluation of existing ones. This framework, while being independent from the underlying networking technology, enables accurate characterization of the various information dissemination tasks that a node performs individually and in cooperation with others. As the central element of the framework, we propose a game theoretic model to describe the interaction of meeting nodes aiming to exchange information of mutual or social interests. An adaptive mechanism is designed to enable a mobile node to measure the social significance of various information topics, which is then used by the node to prioritize the forwarding of information objects. Our study reveals that the physical structure of the network is not the sole factor driving the behaviour of the dissemination task. Instead, the logical structure characterized by the contact and interest patterns of the participating nodes is the key influential factor. Highlighted Findings X In our study of radio overlapping and channel load in the urban traffic scenario, we found a strong evidence that the use of data rates in the lower part of the nominal range specified for VANETs operation in the DSRC/WAVE standard is highly questionable in urban areas when the wireless transmission range grows to the required coverage of long range applications. (Chapter 3) X In our study of the reliability performance in the urban scenario, we observe that the worst case results take place in positions behind the traffic light queue where vehicles are decelerating from high velocity. It is notable that, from a traffic safety point of view, these positions are arguably the most important for timely alerting of dangerous traffic conditions, and their lower reliability may correspondingly lead to an increased risk of serious incidents. (Chapter 4) X In our study of the hidden terminal problem in safety-critical traffic scenarios, we observe that the hidden terminal interference causes a significant decline in the reachable distance of broadcast safety messages, which in several cases drop to distances shorter than the minimum required coverage of medium range safety applications. (Chapter 5) X Our study of the hidden terminal problem in traffic scenarios with the presence of intersections reveals that the aggregate interference power induced by hidden terminals may amount to values several times larger than the induced interference power in an equivalent road scenario, but in the absence of intersections. Our results also show that the most severe interference occurs within a short distance (∼ 200 meters) from the intersection center. These observations indicate the likeliness of severe reliability degradation in safety applications targeted to intersection scenarios. (Chapter 5) X In our study of information dissemination in non-safety applications, we observe that the physical structure of the network is not the sole factor driving the outcome behaviour of the dissemination task. Instead, the logical structure formed by the contact and interest patterns of the participating nodes is the key influential factor. (Chapter 7)" @default.
• W1566883200 created "2016-06-24" @default.
• W1566883200 creator A5042026970 @default.
• W1566883200 date "2013-08-29" @default.
• W1566883200 modified "2023-09-27" @default.
• W1566883200 title "Reliability and Efficiency of Vehicular Network Applications" @default.
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