Research On Deployment Strategy Of Heterogeneous Macro-Femto Cellular Networks

Recent years,with the explosive growth of mobile terminal devices and the exponential growth of traffic demand,single-tier cellular networks composed of macro base stations have been unable to meet the needs of users.Heterogeneous Cellular Networks(HCN)which consist of macro cells and various low power small cells is an effective paradigm to improve coverage and capacity.Massive small cells have been deployed to satisfy the users' Quality of Service(QoS)by operators,however,a significant energy would be consumed caused by dense deployment.With the development of green wireless communication networks technology,the energy efficiency problem of cellular networks has taken more and more attention.The Femto Base Station(FBS)has the advantages of low power consumption,convenient and flexible installation,fill coverage holes,and higher network capacity.Therefore,it has become the focus points of operators and academia that how to deploy heterogeneous macro-femto cellular networks to satisfy the users' quality of service and improve the energy efficiency of the networks.This thesis mainly focuses on the deployment strategy of the heterogeneous marco-femto cellular networks,and the main work can be summarized as follows:1.A uniformly dense macro-femto cellular networks deployment strategy based on energy efficiency and quality of service is proposed.First,the network model which consist of macro cells and femto cells is built.The Macro Base Station(MBS)and FBS following the independent Homogeneous Poisson Point Process(HPPP).The two QoS indicators of SINR coverage and user average rate is analyzed by stochastic geometry theory.Then,under the condition of QoS constraint,Average Spatial Power Consumption(ASPC)is taken as the optimization goal,optimal deploy density and transmission power of FBS are achieved by using optimization theory.Finally,the experimental results show that,comparing with the traditional strategy which only considering base station density,the proposed strategy has advantages in terms of energy efficiency while guarantee QoS.2.A non-uniformly macro-femto cellular networks deployment strategy based on location-aware is proposed.FBS is deployed outside the region within a certain distance away from any MBS and following HPPP.It can reduce the interference between base stations and improve the QoS of MBS edge users.First,the network model is built by stochastic geometry.Then,SINR coverage,single user throughput coverage and energy efficiency coverage is analyzed.Finally,the experimental results show that,comparing with the traditional uniform networks,the proposed strategy has advantages in terms of energy efficiency and QoS by setting appropriate distance and the density of FBS.