Computer Science ›› 2019, Vol. 46 ›› Issue (9): 143-149.doi: 10.11896/j.issn.1002-137X.2019.09.020

• Network & Communication • Previous Articles     Next Articles

Cognitive Spectrum Allocation Mechanism in Internet of Vehicles Based on Clustering Structure

XUE Ling-ling, FAN Xiu-mei   

  1. (School of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,China)
  • Received:2018-08-20 Online:2019-09-15 Published:2019-09-02

Abstract: Nowadays,the spectrum allocation mechanism adopts a fixed allocation mode.With the rapid development of wireless network,it is difficult for limited spectrum resources to meet the communication requirements.Therefore,it is an effective solution to use cognitive radio technology to solve the shortage of spectrum resources.Cognitive spectrum allocation is a key technology to improve spectrum utilization.Based on the specific application of Internet of Vehicles,this paper studied the allocation mechanism of cognitive spectrum,and proposed a three-step cognitive spectrum allocation mechanism based on clustering structure,in which the idle spectrum owner is primary user,the intersection fixed unit is cluster head node,and the cognitive vehicle is intra-cluster ordinarynode.The first step of this mechanism is to judge the current load status of the network.Only when the network load status is overloaded or super heavy load,the cognitive spectrum mechanism will be activated.In the second step,the spectrum allocation algorithm based on traffic congestion priority pricing is adopted for the spectrum allocation between the primary user and the cluster head node,so as to ensure that the total spectrum utility of the cluster head is maximized while the primary user obtains certain income.In the third step,the equalization price spectrum allocation algorithm based on message priority is utilized for the spectrum allocation of the nodes in the cluster,the utility function of the cluster head and the nodes in the cluster is used to derive the supply and demand functions within the cluster,and the market equilibrium principle is used to find the optimal unit price of the spectrum within the cluster.The simulation results are analyzed in terms of the allocated spectrum number and spectrum benefit,and the results demonstrate that the spectrum allocation algorithm based on message priority is better than the non-priority,and the spectrum allocation algorithm based on traffic congestion priority pricing between clusters is better than the average allocation.The results also show that the proposed cognitive spectrum allocation mechanism basically meets the spectrum demands of actual users,improves spectrum revenue and spectrum utilization,and ensures the priority transmission of security messages.

Key words: Cognitive radio, Equalization prince, Internet of vehicles, Priority, Spectrum allocation

CLC Number: 

  • TP393
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