An Advanced Telematics System for Safety, Energy Conservation, and Recreation(I)
子計畫二「車載網路之路況資訊服務:設計一個數位交通號誌及安全監測系統」之目的在於建構一個由車載裝置（Onboard Unit, OBU）及道路通訊裝置（Roadside Unit, RSU）所組成的車間通訊系統，提供經由感測單元所偵測及收集的即時地區性的車輛、道路與路況資訊。
子計畫六「車載網路媒體存取技術」之目標為研發車載網路的媒體存取層的效能改進技術，研究重心將環繞於IEEE 802.11p這個正在制定中的標準，以期能夠在極大化相容於802.11p的同時、改進IEEE 802.11p的效能，以及延伸至對其他基礎網路設備的關鍵合作式通訊技術。
The objective of this project is to establish an advanced Telematics system for safety, energy-conservation, and recreation. Except for considering safety and energy-conservation, we also want to integrate guiding and recreation services on all transportation systems. The Telematics system covers the range from the application layer to the MAC layer. There are two important research topics. One is Telematics services and applications, and the other is Telematics technologies. The objective of the first sub-project is to provide the fleet management services in vehicular networks by designing an energy-conserving and ride-sharing system. By increasing the usage of the roads, we want to achieve the goal of energy-conservation and environmental protection. In the second sub-project, we would like to utilize both on-board unit (OBU) and roadside unit (RSU) to build up a wireless environment for digital traffic sign systems. About wireless networking technologies, we would like to develop a broadcast algorithm, called Streetcast, that is based on the geometric properties of traffic networks. In addition, we will apply network coding to further improve the performance of Streetcast. The objective of the third sub-project is to provide location-based services (LBS) by combining vehicular networks with guiding and recreation for car and bike tours. The first topic is to develop LBS in vehicular networks to provide not only precise location information but also many value-added location-related services. The second topic is to investigate some cases of guiding and recreation for car and bike tours. The goal is to develop a guiding system, which is designed for the purpose of recreation and even energy-conservation, for car and bike tours. Finally, we will implement our system model in Green World in Hsin-chu country, and we will provide cars, bikes, and people location-based and guiding services over vehicular networks. The fourth sub-project focuses on the unicast routing technologies for the advanced Vehicular Ad hoc Networks (VANETs). The VANET is a subclass of MANETs, which would perform crucial functions in road safety, detection of traffic accidents and reduction of traffic congestions. VANETs are evolving as one of the practical applications of MANETs in the future. This vehicular network is interconnected with vehicles which have wireless interface. However, VANETs exhibit very different characteristics from MANETs. The objective of the fifth sub-project is to investigate the broadcast and multicast technologies for VANETs. The relevant technologies of VANETs have attracted numerous research efforts. However, VANETs still lack the concrete and reliable message transmission mechanisms. In this project, we provide various broadcast and multicast mechanisms which are suitable for VANETs. The sixth sub-project is the only subproject which aims at access techniques at the MAC layer for supporting Telematics services and network layer techniques. The wireless vehicular network we consider is a network whose links are physically either 802.11p channels or WiMAX/3G/4G channels. For such a heterogeneous network, we will develop access techniques that help cope with three critical problems in reality. The first problem is topology. To optimize the aggregate coverage with a finite number of RSUs as well as to minimize contention, techniques of topology control and RSU deployment will be developed. The second problem is how to improve transmission efficiency for the vehicles outside RSU coverage. To deal with this problem, we will develop an opportunistic MAC relaying technique that expands the effective RSU coverage. Besides, a mobility management strategy will be designed to minimize the adverse effect due to handoff operations. The third problem is multi-channel operation. A multi-channel allocation technique will be developed to estimate channel delay/quality of a set of heterogeneous channels and allocate idle channels to multiple users with different QoS requirements accordingly. The objective of the seventh sub-project aims at designing an intelligent integrated service system for digital maps and multimedia video/audio applications. Through this service, passengers can enjoy entertainment multimedia services. Our research will focus on satisfying the QoS requirement of the application, improving data delivery rate, and fully utilizing heterogeneous wireless infrastructures.
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