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Research on Service-Intensity Based Vanet Service Disvcovery Strategy and Protocol

Author: ZuoLe
Tutor: LiDeMin
School: Donghua University
Course: Communication and Information System
Keywords: Car MANET Service Discovery Service intensity GPSR routing protocol Cross-layer design
CLC: TN929.5
Type: Master's thesis
Year: 2012
Downloads: 58
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Abstract

The automotive industry with the continuous development of network technology makes people put forward higher requirements for anytime, anywhere communications. The same time, according to the people's needs, a variety of services is constantly applied to the vehicle network. Only its effective network management, and to promote its \Where service discovery is the core content. VANET mobile node faster service request usually has a higher location perception is very different, and the general characteristics of MANET to the VANET service discovery process brought a lot of difficulties and challenges. Therefore, how to improve the efficiency of VANET service discovery is of great significance. The research goal of this article is the car from networking service based on location-aware discovery protocol. First, this article summarizes general MANET and VANET service discovery research status at home and abroad, as well as a unique performance car ad hoc network service discovery process; pointed out VANET Service found that the problems faced by its research directions. Subsequently, according to the city car MANET applications environment, in this paper VANET service intensity concept. Service intensity as one of the identification of service management, service cache of the mobile node to provide a valid reference standard, so that the content can be unified and effective management of the various services in VANET. The service intensity concept applied to the service discovery process, this paper presents the vehicle nodes based on service strength forwarding strategy; choose the next hop node, according to the service strength parameters to make a reasonable decision to find an effective, single of multicast paths; unicast mechanism instead of the flooding mechanism, thereby reducing the redundancy in the data packet in the vehicle network, and to improve the efficiency of the service discovery. Then, based on the analysis of the VANET in value-added information services and safety class, the use of cross-layer protocol design thinking, this paper proposes a cross-layer service discovery protocol SI_GPSR. The protocol is based on the the GPSR location information routing protocols to provide the location of auxiliary functions in the service discovery process, the requirements of the location-aware service request; service discovery and routing combination, to achieve both at the same time found that reducing the service discovery process control information overhead, saving a wireless network with limited bandwidth; service discovery process to provide priority based the service strength forwarding strategy than GPSR greedy forwarding strategy to avoid the problem of routing loops. Finally, based on urban mobility model VanetMobiSim create a vehicle network topology model, the car network value-added class information and security class information scenarios and use the NS-2 network simulation platform, design service discovery protocol simulation to achieve a In this paper, the cross-layer service discovery protocol performance and its performance comparison with traditional VANET service discovery protocol, to highlight of this paper SI_GPSR agreement performance advantages. Can be seen from the simulation results, the paper proposes cross-layer service discovery protocol SI_GPSR exhibit better network performance: take full advantage of VANET roadside fixed node, reduce the total overhead of service discovery, reduce VANET service discovery delay and improve the The VANET services found the success rate and accuracy. This cross-layer design services but there are still some deficiencies in the future will continue to study from the following aspects: (1) service selection mechanism. Service discovery process, how to select the optimal performance of the service project in the same types of services. (2) security certification mechanism. Since the radio channel open wireless network protocols, including the design of the service discovery protocol are facing severe security threat, so consider the added security authentication mechanisms are equally important in the service discovery protocol.

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