Research On Timeslot And Power Resource Allocation Technology Of D2D Communication

With the rapid growth of the number of mobile communication devices,and the continuous development of Internet technologies and communication technologies,people have higher requirements on communication quality of service(Qo S).These requirements including data transmission rate,spectrum efficiency,and network capacity,which also inspired the rapid development of enabling technologies for significant network capacity enhancement in future 5G networks.However,due to the available radio spectrum resources are quite limited for communication systems,it has become a research hotspot to find efficient ways to make full use of the channel resources.Because of the remarkable spectrum efficiency,Device-to-Device(D2D)communication is considered as an effective solution to the limited spectrum resources,and it is a promising communication technique.Under the control of base station in cellular network,D2 D communications underlying cellular networks,share resources with CUEs and improve spectrum efficiency.In addition,D2 D communications can reduce the burden of networks,improve system throughput and data transmission rate,and reduce the power consumption of user equipment.However,the introduction of D2 D communication also brings serious interference environment to the system.Therefore,how to effectively control the interference among different users,which is the premise for D2 D communication can play its unique advantages.This paper mainly studies the time slot resource allocation problem when the number of D2 D users is more than cellular users.Besides,the power resource allocation problem when D2 D users multiplex multiple cell users resource is studied.Firstly,the key technologies of D2 D communication are expounded,and the interference problems caused by a large number of D2 D users are analyzed.Then the construction of inter-user interference graphs is discussed.Combined with interference graph constructed,an algorithm of Group-based Time-slot Resource Allocation based on Interference Graph(GTRAIG)is proposed.Simulation experiments show that the satisfaction of the proposed GTRAIG algorithm is much higher than that based on the ungrouped time slot resource allocation algorithm.Compared with the resource allocation algorithm based on time division scheduling,the satisfaction of the proposed scheme is improved by about 5%.There is a slight advantage in throughput.Secondly,for the investigation of the existing power resource allocation,after the resource allocation solutions existed have been analyzed,we found most of them considering the scenario where multiple D2 D reuse the same resource,or a D2 D allows reuse of multiple cellular user resources.In order to more fully study the resource allocation problem of D2 D users,therefore,the paper studies the scenarios that many-to-many resource reuse.Firstly,the interference in many-to-many resource reuse scenario is analyzed and a problem based on the analysis is constructed.A Power Resource Allocation based on Game Theory(PRAGT)scheme is proposed under the game theory model constructed.This scheme uses a cost factor to regulate channel interference,through game theory model constructed,the interference of D2 D users and the transmission rate of D2 D users are coordinated.Then according to the analysis of Lagrangian dual decomposition theorem,the power allocation problem of D2 D users on each resource block can be transformed into a Lagrangian dual problem.Thirdly,the problem is decomposed into multiple sub-problems.Each sub-problem is considered separately and then solved them.The value of the Lagrangian multiplier is determined according to the improved subgradient method,and the final power allocation result is acquired.Through the research and simulation results of topics raised at the beginning,the proposed algorithm improves the system throughput is confirmed when guaranteeing the quality of cellular user service,and complexity is reduced by more than half.