Research On Resource Allocation Mechanism Of Wireless Network Virtualization

With the rapid growth of mobile communication data and the increasingly complex business scenarios,emerging technologies are difficult to deploy in existing network architectures.In order to change the complex,redundant and difficult-to-manage framework of traditional networks,wireless network virtualization(WNV)has emerged and has been proposed to be an integral part of the next generation of mobile communications networking architecture.WNV separates network resource management and network services,enabling flexible management of wireless network resources,thereby reducing network deployment and operational costs and improving resource utilization.At present,most of the resource allocation mechanisms in the WNV focus on the bandwidth resources of a single base station in the LTE network.Few documents combine WNV with the Cloud Radio Access Network(CRAN)to solve the problem of multi-base station multi-dimensional resource allocation.How to design an efficient and flexible resource allocation algorithm.Ensuring isolation between virtual networks and customizable scheduling policy are the key to wireless network virtualization resource allocation.This paper applies WNV technology to the CRAN architecture.A resource block(RB)allocation algorithm is proposed,which uses RBs multiplexing technology to eliminate interference between RRHs and increase resource utilization.The entire resource allocation algorithm is divided into two processes: First,Infrastructure Provider(In P)allocates RBs in the spectrum pool to Mobile Virtual Network Operators(MVNOs)through an auction mechanism,and then MVNOs allocates RBs to users with the goal of maximum network utility.In order to reduce the time complexity,each RB sub-distribution problem can be regarded as the maximum weighted independent set problem,and the heuristic algorithm is used to solve the suboptimal solution.Finally,the effectiveness of the virtualized resource allocation algorithm in the WNV-CRAN architecture is illustrated by simulation analysis.In the upper auction system,the seller is the original owner of the wireless resource In P,the buyers are the MVNOs,which are the sellers in the lower auction,the buyers are the user of the service.In addition,this paper proposes a joint channel and power resource layered allocation algorithm for WNV-CRAN architecture.Each layer resource allocation system can be regarded as a combinatorial auction mechanism for single sellers and multiple buyers.First,design the bidding form proposed by the bidders at each level.Then,each level of the auction mechanism aims to maximize the sum of the bid values and establish a winner determination problem.Finally,an accurate solution algorithm based on dynamic programming and a pricing mechanism based on VCG price are proposed.In order to obtain the approximate optimal solution in polynomial time,a greedy algorithm is proposed to solve the winner deterministic problem and design the corresponding pricing mechanism.This ensures the personal rationality and incentive compatibility of the auction mechanism.The simulation shows that the two-tier auction system can solve the problem of user association and resource allocation,and achieves good results in social welfare,user satisfaction and resource utilization.