![WAVE RSU setting in Tokyo 23 wards 14 In terms of WAVE RSU coverage, authors use geographical coverage as the ratio of roads that are covered by the buferrs from RSUs.The calculated ratio is based on the length of each road, and result is aggragated by each area. So the caluculation formula of RSU geographical coverage is as follows; [RSU buffer geographical coverage] = [Road length which covered by RSU in each area] / [Total road length in each area]-(1)](https://www.researchgate.net/profile/Tsutomu-Tsuboi/publication/299839866/figure/fig4/AS:511082387042304@1498862944608/WAVE-RSU-setting-in-Tokyo-23-wards-14-In-terms-of-WAVE-RSU-coverage-authors-use_Q320.jpg)
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Optimization for Wireless Vehicular Network System in Urban Area
Abstract and Figures
This paper aims to optimize the usefulness of the next generation vehicular network system so call WAVE (Wireless Access in Vehicle Environment) especially in urban areas that have heavy traffic density and high potential traffic accidents. The wireless vehicular technology is mainly based on DSRC (Dedicated Short Range Communication) technology defined by IEEE (Institute of Electrical and Electronics Engineers Inc.) and ETSI (European Telecommunication Standard Institute). The WAVE system is going to be used for safety and comport of vehicle mobility, for example, to avoid collision of car to car, car to other mobility and car to pedestrian and to reduce traffic congestion. In order to achieve those purposes, WAVE system is installed in vehicles as OBU (On Board Unit) and set at road side as RSU (Road Side Unit). Therefore, it is important how to set RSUs appropriate position. Authors analyze traffic condition and traffic accident condition of typical urban metropolitan area such as Tokyo and provide RSU setting guide from urban development point of view.
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... For an identical transmission power, a low-frequency signal has a greater range than a high-frequency one due to decreased free space attenuation and lower absorption by various building materials and obstructions. The range gain for the 700 MHz band over the 5.9 GHz one is about 8, when only free space propagation loss for the direct wave is considered [6]. Among the advantages of transmission at 5.9 GHz over the 700 MHz, we note the higher transmission rates capabilities, which however is not quite relevant for safety applications. ...
Communication in Vehicular Ad-hoc Networks (VANETs) is standardized at frequencies around 5.9 GHz in Europe and USA. In this paper we demonstrate by simulation that using a supplementary lower frequency, e.g., around 700 MHz, the Received Signal Strength (RSS) is improved, enabling the communication in areas where obstacles obstruct the communication at 5.9 GHz.
Vehicular ad-hoc network faces many challenges, in particular frequent handoffs due to high mobility of vehicles is a serious performance limitation factor and is probably the most critical process in terms of packet loss and delay. In this paper an efficient
mechanism of Vehicular Ad-hoc Networks (VANETs) is proposed for making handoff decision that considers both Received Signal Strength (RSS) and Global Positioning System (GPS) information along with maps. Furthermore; the proposed mechanism focuses on nodes moving at high speeds while receiving and saving the relevant information in buffers. This particular approach not only minimizes delay and packet loss but is also used to re-transmit the lost packets locally. The addition of this capability in the proposed mechanism contributes in improving the packet loss in less crowded areas having limited available connectivity.
A simple transmission formula for a radio circuit is derived. The utility of the formula is emphasized and its limitations are discussed.
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Feburuary 2012
LLC: mobile broadband explosion, 3GPP wireless evolution
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mobile
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wireless
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