Transmission Capacity Analysis For Mm Wave Vehicular Networks

More and more multifunctional and complex in-vehicle sensors have accelerated the development of autonomous driving,but their limited sensing range has brought challenges to vehicle's.automation abilities.It is urgent for vehicular networks(V2X)to support vehicles sharing a large amount of data about the surrounding environment and expand their perception range.As an effective complement to V2X low-frequency(sub-6GHz)communication,high-frequency mm Wave technology injects new vitality into the development of V2X technology with its abundant spectral resources.Meanwhile,the directional vulnerability and blockage in mm Wave vehicular mobile environment will affect the capacity of networks.Therefore,this paper uses the stochastic geometry theory,firstly studies the capacity of traditional sub-6GHz V2X under different resource allocation mechanisms.Then,we combine the transmission characteristics of mmWave in specific vehicle environment to conduct a study on the transmission capacity of mm Wave vehicular networks.Firstly,based on a linear highway,the V2X capacity analysis is performed under two different communication modes.In mode 4 based on autonomous resource selection,the transmission outage takes into account the collision caused by random resource selection and the interference of concurrent nodes to the typical receiver outside the sensing range.In mode 3 based on base station scheduling,the transmission interruption is closely related to the relationship between supply-demand of schedulable resources and vehicle density.After rigorous mathematical derivation,the outage probability and transmission capacity expressions are obtained and verified by numerical simulation.Results show that networks have the optimal vehicle density to maximize the network transmission capacity.Next,we consider two specific scenarios:(1)mm Wave V2V communications in the same lane,a blockage model based on the relative distance of vehicles is provided;(2)mm Wave V2I communications in multi-lane,a three-dimensional blockage model for vehicles in different lanes is proposed.The closed expressions of transmission outage probability,network capacity and rate coverage probability are derived in detail.Monte Carlo and numerical simulation results show that at the same data rate,mmWave V2V networks compared with the performance of sub-6GHz V2X can not only support high density,but also improve the overall capacity of the network.In addition,mmWave V2I links with can support rates over 1Gbps within a certain range.The research in this paper will provide a technical reference for the future deployment and design of mmWave vehicular networks.