A Feasibility Study on Telematic Communications Jointly Supported by DSRC and 3.5G Networks
| Autor: | Jian-Ming Lu, 盧建銘 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 In the future, a wireless vehicle communication system is necessary for intelligent transportation systems link. It can be used to avoid the occurrence of traffic accidents required to pay the social costs and be used for control traffic flow and also avoid traffic congestion. Current development of mobile communication systems such as 3.5G in the HSDPA (High Speed Downlink Packet Access) system and the DSRC (Dedicated Short Range Communication) can be used to implement, but because different systems have different network capacity and services, so the need to integrate. In today''s 3.5G high network coverage environment of wireless network, this master thesis propose a hybrid system, select the deployment in urban areas using DSRC system and using 3.5G systems in rural area. Because of roaming form DSRC to HSPDA the application will be interrupted. Therefore this master thesis evaluates the bottleneck of 3.5G network’s capacity and provides an algorithm to improve the number of vehicle that 3.5G networks can serve and make full use of application as much as possible., then we''re going to explore the transfer of the two systems situation, and proposes to use a adaptive algorithm called D2H to enhance the maximum number of service vehicles in 3.5G network. In this condition, we have the speed to simulate different traffic flow in the system under different transfer conditions, the simulation results including the average handoff time and the handoff failure rate, and can go through the simulation results of 8 Drive, 6 Drive, 4 Drive under various traffic conditions, traffic flow will cause the size of the handover failure rate of the system. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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