Interference Management Based On Multidimensional Resource Allocation In Heterogeneous Wireless Network

In the heterogeneous networks(HetNets),the cross-tier interference has been introduced accompanied by the deployment of lots of small base stations.This increases the complexity that the system manages the interference.At present,most of literature with respect to HetNets mainly focus on the scenario that users are uniformly distributed and the user density is moderate.Nevertheless,the complexity of interference management further increases at some concentrated places of users,such as railway station,scenic spot.There are two problems caused by users with dense: firstly,the shortage of spectrum resource;secondly,the problem of position overlap resulted in by user with dense.Both of them bring out lots of difficulty to manage interference.Thus,it is a valueble problem to study that interference management in the heterogeneous networks where users is dense.This article consider the problem of interference management from multiple domains.In other words,the cross-tier interference of different types of users is dealt with by the way of combined resources scheduling of frequency and space domains under the condition of limited resources to improve the spectrum efficiency and system capacity.Consequently,the system throughput is improved.In this paper,we propose an interference management algorithm based on combined resources scheduling of frequency and space domain,according to the merit and demerit of interference management method at present.The most important step is that we classify users into two classes according to the characteristic of users' channel correlation.users is classified to two class: CB(Coordinated beamforming)set and JP(Joint Process)set.Because of the limitation of frequency resources,we firstly take full advantage of the spatial reuse to improve the capacity and spectrum efficiency in the CB set.And then we complete the resource allocation by the way of graph theory in the CB set.according to the offset of frequency resources we cope with the problem of mode selection that users employ the coordinated multiple point(CoMP)to realize the reasonable utilization of frequency resources.We can get the optimal solution of resource allocation by modeling and solving.At last,we realize that the threshold changes dynamically by the way of iterating and accumulating a value.In this method,we achieve classifying the user classes perfectly.Through the above steps,we can achieve the goal that the system capacity is improved and the interference is cancelled.Consequently,the system throughput is improved.