Media Access Control Protocol Optimization In Vehicle Environment

With the progressive development of the Internet technology and the transport system,research institutes and manufacturers have aroused more and more concern and studyabouttheInternet of Vehicles(IOV),the Internet of Vehicles is a subset of today’s lead ing edge ofscientific research, also is the concrete format used in Intelligent Transport System(ITS) of theInternet of Things(IOT).Media Access Control controls the access and the usage of thewireless terminal system, currently the mature Media Access Control is CSMA/CA (CarrierSense Multiple Access with Collision Avoidance) and TDMA (Time Division Multiple Access)Nowaday the media access control still has more further optimization.This thesis firstly studies the wireless knowledge, and also the WAVE (Wireless Access inVehicular Environment) wireless communication protocol stack technology and IEEE1609protocol.The analysis of their characteristics is also presented.Considering a huge quantity information, a short communication time, the concept ofcontrol channel and service channel raised by IEEE1609protocol, and the bottlenecks ofsingle NIC, this thesis proposes a dual NIC design scheme, uses the Libpcap raw socket toimprove the performance, achieve a dual NIC media access system platform and the conceptof control channel and service channel, tests the performance between Libpcap and TCP/UDP.Then for the further improvement of any NIC s usage of channel, this thesis also proposea TDMA theory optimization, studies the TDMA time slot allocation map ofLocation-Assisted Random Access Scheme, proposes a Location-Assisted MultipleAccessScheme, defines the collision probability and throughput as two performanceindicators, uses genetic algorithms to solve the problem.By the Matlab simulationperformance, the scheme is verified to be a better performance compared to normal randomaccess scheme.Dual NIC media access control system provides a powerful support system forapplication system, achieves the performance optimization. The theoretical performance ofLocation-Assisted Multiple AccessScheme provides more further guidance of the mediaaccess of the vehicle networking system.