| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 99 === The wireless access in vehicular environment (WAVE) architecture of intelligent transportation system (ITS) has been standardized in the IEEE 802.11p specification and it is going to be widely deployed in vehicle to roadside (V2R) and vehicle to vehicle (V2V) communication environments in order to provide prompt emergency information and internet services. However, due to the WAVE network employs the IEEE 802.11 contention-based protocol, the obvious drawback of WAVE network is the low channel efficiency. The IEEE 802.16e network, which has been designed as a centralized control system to provide the mobile services in a wireless metropolitan area network (WMAN), is a potential candidate for optimizing the efficiency of WAVE network. As on-board-units (OBUs) equip with IEEE 802.11p and IEEE 802.16e transceivers, the drawbacks of IEEE 802.11p contention-based medium access control protocol and ad-hoc routing protocol for V2R and V2V operations can be resolved by using IEEE 802.16e centralized scheduling scheme. As a solution, we propose an efficient scheme, namely heterogeneous network scheduling scheme (HNSS), which not only allows the OBUs to access service channels in a contention-free manner but also provides OBUs low cost routes to get internet access via IEEE 802.16e centralized scheduler. Numerical and simulation results demonstrate that the proposed HNSS can significantly improve the standard transmission efficiency.
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