Research On Beam Optimization And Scheduling Based On V2I Communication

With the rapid development of V2 X communication,some advanced vehicular applications like high-quality entertainment services and largecapacity sensor sharing,require a higher V2 I transmission rate for future vehicular communication.Thus,it is imperative to improve the throughput of V2 I communication systems.Facing these challenges,millimeter wave(mm Wave)communication becomes a feasible solution.Generally,mm Wave systems operating at high frequencies,so the signal has strong attenuation in space.The communication distance of the system is short.Beamforming technology is used to improve the quality of communication links.On the other hand,the hybrid beamforming architecture is widely used in actual engineering due to its better economic benefits.Starting from the highway V2 I communication scene,this article studies the beamwidth optimization and beam resource scheduling in mm Wave systems based on the hybrid beamforming architecture.For beamwidth optimization,this article analyzes the particularity of the highway scene.In free-flow traffic conditions,vehicles' trajectory can be estimated from traffic speeds.This allows us to explore the impact of beamwidth changes on the overall vehicular throughput.First,we introduce the transmission slot structure of the synchronization signal(SS)block.After that,a non-uniform beamwidth design mode is proposed.This mode removes the inherent constraint between beamwidth and training overhead,and provides more flexible beam design capabilities.Then,a non-uniform beamwidth optimization scheme based on global estimation is proposed.Compared with the conventional uniform beamwidth schemes,by appropriately reducing the throughput over a distance of 30%,our scheme improves the throughput by nearly 23.2% over a distance of 70%,and obtains a better global data amount.According to statistics,our non-uniform scheme can increase the global data amount from 6.5% to 11.6% at different traffic speeds.For beam resource scheduling,the problem is that the beam transceiver of the road side unit(RSU)only provides a limited number of radio frequency(RF)chains.When the number of mm Wave communication requests increases,the system needs to perform beam resource allocation according to a certain criterion.This article first introduces an indicator that characterizes the fairness of the user experience.Based on this indicator,two beam resource scheduling strategies are proposed.One is power-based beam scheduling(PBS),and the other is time-based beam scheduling(TBS).Compared with the scheduling strategy based on the global maximum data amount(GMA),by sacrificing nearly 28% of system throughput,PBS and TBS have obtained better fairness indicators,which have dropped to 30.2%and 0.17% of GMA,respectively.Through this compromise,users can be provided with more stable data transmission capabilities.