IP Address Exchanging Strategy for VANET
| Autor: | Wen-Chun Peng, 彭文君 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 A Vehicular Ad Hoc Network (VANET) is a specialized form of Mobile Ad Hoc Network (MANET), it consists of smart vehicles on the road and provides Inter-Vehicle Communication (IVC) and Roadside-to-Vehicle Communication (RVC). In VANET, roadside units are equipped with access point (AP) and are connected to the Internet via back-bone wired networks. Vehicles can either utilize multi-hop relaying through neighboring vehicles or communicate directly with roadside units to access the Internet, and obtain a variety of convenient services. For the Internet applications, IP addresses are used as the host identifiers and build the routing information. Therefore, vehicles in VANET require possessing a unique IP address to access the Internet. Compared with distributed address configuration scheme, Centralized Address Configuaration (CAC) scheme using DHCP can assign a unique IP address to vehicles in a large area. However, due to short of available IPv4 addresses, the usages of IP addresses assigned by centralized scheme need to be restricted to the existing service region. Furthermore, duplicate address detection (DAD) process in DCHP transaction is a time-consuming process, it will greatly reduce vehicle’s available network connection time. In this study, IP address exchanging strategy was proposed to solve the aforementioned problem. By delimiting the IP address service region, IP Address Configuration Scheme using IP Address Exchange (IPX) will prevent the vehicles from using invalid IP addresses outside the corresponding service region, and also avoid the IP address exhaustion of the centralized DHCP server. Besides, through movement detection, vehicles leaving the service region will try to exchange the owned IP addresses with the IP addresses of vehicles entering the service region. As a result, IPX could eliminate the DAD process in DHCP transaction, reduce the overhead of acquiring an IP address and improve the network connectivity effectively. The simulation results show that our proposed IPX scheme could reduce the average vhehicle address configuration time and DHCP server network load. Compared aginst CAC, IPX reduces the average vehicle address configuration time by at least 6.7% for low traffic conditions, and reduces by at least 11.5% for high traffic conditions. In terms of DHCP server load improvement rate, IPX improves by at least 6.2% for low traffic conditions, and improves by at least 12.9% for high traffic conditions. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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