| Summary: | 碩士 === 淡江大學 === 電機工程學系碩士班 === 98 === In recent years, the development of network technologies has greatly changed human being’s living habits, and the abundant network services are also getting more and more close to human lives. With the maturity and popularization of network technologies, the network applications have developed from household electronic products to products for mobile vehicles. In such an evolution, several vehicular network standards and drafts have been released, like 802.11p that is extended from 802.11.
Owing to the establishment and release of the draft of 802.11p, VANET is becoming well-known and more and more people have involved in related researches. Generally, the equipments of VANET can be divided into two categories: Road Site Units (RSU) or Infrastructure, and moving vehicles. The communication of VANET also can be divided into two types: Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I).
Because it is expensive to establish RSU, the number of RSU is usually too few to cover areas like suburbs or areas with sparse population. In other words, the resource of RSU is rather precious in VANET. In order to promote the utility of RSU, we propose a novel mechanism to improve the efficiency of communication between vehicles and RSU (Vehicle to Infrastructure, V2I).
Our proposed mechanism in this paper is called “Distributed Sorting Mechanism (DSM)”. In DSM, every vehicle can individually calculate its own priority of communication and the time to compete and obtain the channel can be reduced. We further consider the vehicles moving away from the coverage of communication and adjust their priorities of communication appropriately. Moreover, DSM owns the characteristic of “Deadline First” in specific situations. Using DSM can not only simplify the handoff procedure and reduce the network overhead, but also achieve the adequate utilization of RSU resource.
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