Research On IoV Relay Selection Algorithm

The Internet of Vehicles is an indispensable communication technology in 5G /B5 G wireless communication systems.In the context of the maturity of the Internet of Things(IOT)technology,the ultimate goal of Internet of Vehicles(Io V)is to realize the information interaction between vehicles and all surrounding wireless communication devices.However,a large amount of interactive information in the Internet of Vehicles is widely spread,user nodes are extremely mobile and open,and the network topology changes rapidly.These characteristics make communication links change frequently and are prone to interruption.This paper proposes the use of relay cooperative transmission technology in the Internet of Vehicles.From the perspective of the design of the relay selection algorithm and the analysis of system performance,the influence of the relay selection algorithm on the reliability and stability of the communication of the Internet of Vehicles is studied.The main innovations of this article are as follows:1.Aiming at the problem that the relay selection scheme based on a single parameter cannot adapt to the complex communication environment of the Internet of Vehicles,this paper proposes a relay selection scheme based on multi-parameter decision making.Considering the bandwidth,delay,node switch prediction value of the candidate relay nodes and corresponding requirements of the user nodes,the performance of the candidate relay nodes are evaluated by a linear additive weighting(LAW)function respectively,and finally the optimal relay is obtained.The simulation results show that the proposed relay selection scheme is superior to the traditional scheme in terms of system throughput and relay switching times.2.Aiming at the single path instability problem in the previous relay selection algorithm,this paper proposes a multi-connection based relay selection algorithm.The following two relay evaluation criteria are considered: the traditional GPSR algorithm and the multi-parameter decision algorithm based on link stability.Based on this,two optimal relays are selected,and the sending node sends the data to the two best relays respectively,and finally realizes multi-path transmission.Theoretical and simulation analysis shows that the multi-connection based relay selection algorithm has advantages in terms of outage probability,data transmission success rate and transmission delay.3.Aiming at the characteristics that optimal relay cooperation can compensate for the topology of the Io V changes rapidly,but its terminal nodes are susceptible to aggregation interference in heterogeneous networks.This article has conducted indepth research on the performance of Io V in 5G ultra-dense networks(UDN),and proposed the use of opportunistic relay selection schemes and Decod-and-Forward strategy to assist data transmission.At the same time,a closed expression for the outage probability of the Io V under aggregated interference is derived.Finally,simulation experiments prove the correctness of the theoretical derivation and the effectiveness of the relay cooperation scheme proposed in this paper.4.Aiming at the scenario of relay cooperative transmission of Io V where information stealers exist,an opportunistic relay selection strategy and maximum ratio combining(MRC)technology are used to design a secure transmission scheme in which the direct transmission link and the multi-hop relay forwarding link coexist,aiming to improve the reliability and security of information transmission.At the same time,based on obtaining the channel probability density function(PDF)and cumulative distribution function(CDF),a closed expression for the safety outage probability of the Io V system is derived using methods such as the full probability formula.The information transmission channels involved are all subject to the Nakagami-m distribution,which makes the theoretical derivation more difficult.The final simulation experiments confirmed the accuracy of the theoretical derivation and the feasibility of the scheme.