Research On Resource Allocation Algorithms In Hetnet With D2D Support

The explosive growth of mobile communication data traffic and access network equipment make some research organizations set up a future 5G network development plan.They believe that the future 5G network will have higher capacity,faster transmission rate and lower delay.In order to meet the needs of 5G network,some researchers have come up with some new technologies such as Massive MIMO,Small Cell,D2 D and so on.So,the future 5G network is likely to be a HetNet,including variety of technologies.This thesis focuses on the resource allocation problem in HetNet composed of macrocell,Small Cell and D2 D communication.The details are as follows:Firstly,this thesis mainly researches interference problem caused by D2 D users and Small Cell users who reuse macro cellular users' s uplink spectrum resources.In order to reduce the interference in the network,this thesis proposes a resource allocation algorithm based on auction theory to allocate resources for D2 D users and Small Cell users.First,since D2 D user and the Small Cell user reuse RB of MUE,it is called reuse users,who can be called buyers in the auction,the macro base station as the auctioneer,the macro cell users with the resource block as the sellers;then,allocate resources to reuse users based on the traditional British price auction method,and introduced the largest auction budget value and the second auction mechanism in the auction.The simulation results show that the proposed algorithm can improve the throughput of the system effectively and ensure the fairness of the reuse users to a certain extent.Secondly,this thesis mainly researches interference problem caused by introducing D2 D users into Macro-Small network.First of all,because D2 D users can choose D2 D mode or cellular mode in Macro-Small network,and different modes will bring different effects to the network,this thesis proposes a mode selection algorithm based on location information.It can determine whether the user can select D2 D mode to communicate by limiting the user's distance and interference value.Secondly,because the D2 D users in the reuse mode will cause serious interference to the network,a resource allocation algorithm based on max intereference of tolerance information is proposed to reduce interference in the network,which mainly uses the maximum and minimum transmit power of the D2 D user to carry out RB select.The simulation results show that the proposed mode selection algorithm can help the user to select the appropriate mode for communication,and the resource allocation algorithm can improve the system throughput effectively.