The Research On Interference Coordination And Resource Optimization For D2D Communication Under Cellular Network

The Device to Device(D2D)communication is now introduced in cellular networks,where D2 D user reuses the spectrum resource of cellular users for communication which will result in a serious co-channel interference between cellular user and D2 D user,it is essential to design an effective scheme of interference coordination and resource optimization to reduce the co-channel interference.To solve the above problem,two schemes for interference coordination and resource optimization based on two different optimization goals are put forward in this thesis and the main contents are stated as follows:Firstly,an outage probability-based interference coordination and resource allocation method is proposed in this thesis.Considering the scenario that several pairs of D2 D users and cellular users are randomly distributed in a single cell,it is restricted that the spectrum resource of a cellular user can be reused by at most one pair of D2 D users and one pair of D2 D users can reuse the spectrum resource of a cellular user at most.The program is mainly carried out in two steps Firstly in order to reduce the mutual interference and signaling overhead of the base station,an isolated section around the base station was set up to assure the normal communication of the cellular user.When the D2 D user is in the isolated section,the traditional mode of cellular communication is adopted and the spectrum resource of cellular user is forbidden to reuse.Otherwise the D2 D user is allowed to transfer information in D2 D communication mode by resuing the celluar spectrum resource.Secondly,the cellular spectrum resource is allocated for D2 D users who can communicate with each other in D2 D mode making the outage probability of all the D2 D users the lowest.At this stage,the resource allocation problem equals to the distribution problem of graph theory,Which can be solved with the help of algorithms of Jonker-Volgenant.The Simulation result shows that the proposed scheme works well in reducing the average outage probability and solve the problem of co-channel interference on the premise of guaranteeing the normal communication for the cellular users.Secondly,based on the same scenario and restriction as the first part adopted.another scheme based on the energy efficiency is proposed in this thesis.The sheme is carried out in two steps.The first step mainly involves the power control towards the single D2 D users and under the restriction of the minimum rate of cellular user's minimum rate and the maximum power of D2 D and cellular users.the power of the D2 D users and the cellular users is optimized to maximize the energy efficiency.At this stage,the Dinkelbach algorithm based on the parameter is adopted to allocate the power.At the second step,the Kuhn-Munkres(KM)algorithm is used to allocate the cellular spectrum resources for D2 D users so that the total energy efficiency of all D2 D users is maximized.The simulation results shows that with the insurance of the normal communication and other restrictive conditions of cellular users,this scheme can greatly raise the energy efficiency of the D2 D users in comparision with other schemes.