09-04-2012, 05:09 PM
Issues of Routing in VANET
IssuesofroutinginVANETmasterthesis.pdf (Size: 1.22 MB / Downloads: 485)
Introduction
The increasing demand of wireless communication and the needs of new wireless devices have tend to research on self organizing, self healing networks without the interference of centralized or pre-established infrastructure/authority. The networks with the absence of any centralized or pre-established infrastructure are called Ad hoc networks. Ad hoc Networks are collection of self-governing mobile nodes [24].
Background
VANET belongs to wireless communication networks area. VANET is the emerging area of MANETs in which vehicles act as the mobile nodes within the network. The basic target of VANET is to increase safety of road users and comfort of passengers. VANET is the wireless network in which communication takes place through wireless links mounted on each node (vehicle) [1]. Each node within VANET act as both, the participant and router of the network as the nodes communicates through other intermediate node that lies within their own transmission range. VANET are self organizing network.
Problem Statement
Previous studies on VANET routing focused more on single ad hoc routing method (e.g. most researchers focused on traditional ad hoc topology based routing, while some other focused on position based ad hoc routing method in VANET). The selection of routing method heavily depends on the nature of the network. Thus single ad hoc routing method is not sufficient enough in meeting all the different types of ad hoc networks.
Aims and objectives
Aim of our study is to identify which ad hoc routing method has better performance in VANET. The main purpose of our thesis is to study different routing methods of ad networks which is applicable in VANET and to find protocols that more suitable in various scenarios (City & Highway). We will use these parameters i.e. throughput and packet drop for comparison with already implemented protocol in VANET. On the basis of comparison we will be able to suggest which routing protocol is suitable for which scenario of VANET.
Related work
Several routing protocols have been defined by many researchers for VANET. With the passage of time there is a need of having new protocols in order to have successful communication. The history of VANET routing begins with the traditional MANET routing protocols. Several „topology‟ based routing protocols for MANET had been analyzed for VANET.
Mobile ad hoc networks routing
There are hundreds of routing protocols which have been proposed for ad hoc networks. In MANET no fixed network topology is used. Therefore, mobile nodes adopt any runtime topology due to their own dynamic behavior. In addition, there exists not even single method for routing in MANET, as network is created at runtime.
Topology based routing
Several MANET routing protocols have used topology based routing approach. Topology based routing protocols use link‟s information within the network to send the data packets from source to destination [24]. Topology based routing approach can be further categorized in to three groups:
Proactive routing
Reactive routing
Hybrid routing
Summary of the results
We discussed and analyzed the simulation results of our study in this chapter. We selected throughput and packet drop performance metrics for the evaluation of routing protocols. To check the performance of routing protocols in VANET we designed two different networks and named them as highway and city.For the highway scenario we have selected AODV and GPSR and evaluate them in the presence of low and high node‟s speed on highways.