線型網絡VANET傳輸容量研究
[Abstract]:As one of the important components of the Internet of things and Intelligent Transportation system, (VANET) has attracted wide attention from academia and industry. The standards of IEEE802.11p and IEEE 1609.x have been published one after another. It also guides the research and development of VANET in the future. However, the traditional VANET research directly inherits the model and research framework of wireless ad hoc networks. Therefore, there are two key shortcomings in this kind of achievement: one is the lack of simulation of vehicle behavior and distribution more closely to the actual situation, the other is that the modeling of 802.11p MAC layer mechanism is not perfect or even lacking. In order to get the research results of VANET which is more appropriate to the actual vehicle communication environment, this paper intends to start with the most basic linear VANET network and make up for the above two deficiencies. In order to obtain a more reasonable upper bound of transmission capacity of linear VANET network or the expression. VANET transmission capacity as one of the key indicators to reflect the performance of the vehicle ad hoc network. The calculation and derivation of its specific expressions or bounds has always been a hot and difficult point in related research fields. In order to derive a more real upper bound and expression of transmission capacity, a more mature vehicle following model is introduced to describe the distribution of vehicle nodes. Using the characteristic of CCA mode in 802.11p MAC layer EDCA mechanism, the channel access mechanism of 802.11p MAC layer is modeled. Thus, a set of linear VANET research models which can simulate the vehicle driving behavior and EDCA channel access mechanism of real linear road are constructed. On the basis of the above model, this paper first improves the defect of the interference model in the study of the upper bound of the transmission capacity. Then it is proved that the transmission capacity of the network can reach the upper bound under the limit distribution condition of some simultaneous transmission vehicle nodes. According to this distribution, the expression of the upper bound of transmission capacity is derived, and the simulation is compared with the previous similar research. The results show that the improved upper bound has better performance in the environment of high vehicle node density and can accurately calculate the instantaneous maximum transmission capacity in simulation. Based on the improved upper bound of transmission capacity, the Rayleigh fading (Rayleigh Fading) channel environment is considered. By introducing new parameters such as average distance of transceiver node and outage probability, the upper bound of transmission capacity of linear VANET in Rayleigh fading channel is derived. The simulation results show that the average transmission capacity of linear VANET in Rayleigh fading environment is close to the upper bound. Based on the model and theoretical basis of the study, an accurate expression of the transmission capacity of linear VANET is derived at last. However, due to the high mathematical complexity, the expression needs to be further simplified. In general, based on the more realistic vehicle behavior model and the simulation of MAC layer channel access mechanism, the upper bound expression of linear VANET transmission capacity in large scale fading and Rayleigh fading environments is obtained, and its rationality is verified by simulation. At the same time, we try to deduce the exact expression of transmission capacity. The above research will provide some reference and reference value for the theory of VANET transport capacity which is highly consistent with the real environment.
【學位授予單位】:北京郵電大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TN929.5;U495
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