| Summary: | 碩士 === 國立交通大學 === 網路工程研究所 === 103 === Congestion control is an important issue in vehicular networks. The loss of messages due to congestion may cause seriously deteriorate to the reliability of Intelligent Transportation System (ITS) especially for safety applications.
European Telecommunications Standards Institute (ETSI) has specified a set of Decentralized Congestion Control (DCC) standards. DCC is a cross-layer protocol across Access layer, Network &;Transport layer, Facilities layer, and Management layer in ETSI TC-ITS. So far ETSI mainly focused on Access layer DCC and is lack of discussion on the Facilities layer issues. The task of Facilities layer DCC is to allocate available channel resource to vehicles with fairness assumption, dividing total channel resource equally amongst vehicles in the channel. However, this mechanism is not adaptive to safety applications where vehicles may have different priorities in terms of emergency.
In this thesis, we proposed a channel resource allocation mechanism for the Facilities layer DCC. The mechanism takes account of needed and feature of Forward Collision Warning (FCW) application. Simulation results show that the proposed method can improve the performance of FCW compared to existing mechanism.
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