Research On Spectrum Resource Allocation Of Femtocell In LTE-A Heterogeneous Network

With the development of science and technology,wireless communications has also undergone enormous changes.At the same time,the user's business needs are also increasing.The development of wireless communications still can not meet the user's multimedia data needs.Especially in the indoor environment,because of the traditional communication signal through a long distance attenuation and loss,the indoor communication quality and coverage performance is poor.Femtocells emerge as the times require.A home e Node B is a plug-and-play device which deployed in an indoor environment and serves users in small range.The deployment of Femtocell can not only improve the communication quality of indoor user,meet the indoor user's high-speed data rate,but also unload the macrocell's communication pressure,improve the capacity of the entire communication network.However,the deployment of the Femtocell has changed network structure,which brought a serious ordeal for the management of the Femtocell.In particular,the randomness,denseness and distributed deployment of the Femtocell will inevitably lead to cross-tier interference between the Femtocell and the macrocell,as well as the intra-tier interference between the Femtocell.The effective management of spectrum resources is one of the main ways to mitigate the interference.The intra-tier interference between Femtocells was studied,and three kinds of fully distributed resource allocation strategies by different technical means was proposed in this paper.Firstly,a simple Cognitive Femtocell resource allocation strategy is proposed by using cognitive radio technology.This strategy integrates cognitive radio technology into the Femtocells,Femtocell can avoid intra-tier interference by sensing environment and according alters its resource.Secondly,using the game theory,a fully distributed proportional resource allocation strategy was proposed.Based on the game algorithm,a half-allocation strategy and a probability quit strategy was designed in this strategy,which can guarantee the service quality of high priority users,and guarantee other users have a good fairness.Finally,the idea of full distributed resource allocation in the field of Femtocell carrier aggregation was introduced,and a fully distributed dynamic resource allocation strategy based on carrier aggregation technology was proposed.A simple but efficient algorithm was designed in this strategy.The algorithm allocates a necessary principal component carrier and the corresponding secondary component carrier for each Femtocell.This algorithm is very suitable for carrier allocation scene,it tries to avoid the interference between the carriers,and ensure the fairness.The simulation results show that the proposed algorithms have obvious advantages in some aspects(such as fairness,spectrum spatial Reuse,SINR,convergence,etc.)compared with other resource allocation strategies in related fields.Finally,the advantages and disadvantages of the proposed three algorithms was summarized,and the next work plan was expected.The work of this paper provides effective reference schemes for the deployment of Femtocell.