A Stuty Of Interference Management And Resource Allocation In D2D Underlaying Cellular Network

The Device-to-Device(D2D)technology is a new technology for next-generation wireless communications.That is,equipment-to-device communication does not require technology that is directly performed by a base station or a core network.It has many advantages such as improving spectrum utilization,reducing base station load,reducing communication delay,saving equipment power consumption,and the like.The D2 D communication technology is introduced into the cellular system,causing a diversification of resource allocation modes of the original cellular system.At the same time,D2 D users can reuse spectrum resources of other cellular users and also generate a complex electromagnetic interference environment for the system.This article addresses the issues of resource allocation and interference management in D2 D multiplexing mode in cellular systems.First,the D2 D communication multiplexing uplink mode ensures that the base station receives the uplink quality of service of the cellular user,the D2 D receiver receives the D2 D sender quality of service,and simultaneously reduces the burden of the base station when allocating resources.This paper has studied and proposed An Improved D2 D Resource Allocation Algorithm Based on Interference Restricted Area.Before the resource allocation,in order to meet the cellular user uplink QoS received by the base station,a D2 D user multiplexes the multiplexing access matrix of the cellular user to determine whether the D2 D user is far away from the BS and the D2 D user and the BS.The link gain is small;in order to satisfy the QoS of the D2 D user,a multiplexing interference matrix of the cellular user received by the D2 D receiver is established to judge that the link gain between the cellular user and the D2 D receiver is small.Secondly,a preliminary D2 D multiplexing resource pool is established according to the two matrix results.If the resource pool is small,resource blocks are allocated according to maximizing the overall interference of the system.If the resource pool is large,the size of the resource pool is reduced according to the load capacity of the base station and then performed again.Resource allocation.Simulation experimental results show that the algorithm can effectively improve the overall capacity of the system and reduce the system load while approaching the global optimization algorithm.Second,for the problem of non-base station related link measurement in D2 D multiplexing downlink mode,this paper studies and proposes a D2 D resource allocation algorithm based on overlapping pilots.The algorithm firstly constructs the resource linked list by using the power difference method,and at the same time sets the switch for controlling the D2 D temporary communication to facilitate measurement of the measurement of the non-base station related link.When the switch is closed,the user is in a non-D2 D state.The base station measures the channel state information of the cellular users in the D2 D receiver and resource list;when the switch is turned on,D2 D is in a temporary communication state,and the base station measures the D2 D receiver and the cells in the resource list.The user has multiplexed channel state information.The base station estimates the multiplexing interference on each resource block through the measurement results of the above two links,and allocates resources with the objective of minimizing multiplexing interference caused by the cellular user as the maximum possible performance between D2 D users.This scheme can use less secondary link information to measure multiplex interference by controlling the switch of D2 D temporary communication,so as to allocate resources,minimize multiplexing interference,and improve the overall performance of the system.Finally,for the problem of resource competition in resource allocation in a fully loaded network with multiple D2 D communication requests,the dissertation studies and proposes a D2 D resource allocation algorithm based on access permissions.The algorithm converts the resource allocation of D2 D users into a nonlinear constrained optimization problem by setting the SINR threshold of the base station in the resource blocks occupied by each cellular user,the SINR threshold of the D2 D receiver,and controlling the transmit power of each transmitting user.The D2 D resource allocation interference matrix is established,and then the resource allocation is performed for multiple D2 Ds in the order in which the multiplexing interference caused is minimum.This scheme allows the access process and power control to guarantee the minimum QoS of the base station and each user,solves the resource competition problem of multiple D2 D communication requests,reduces the system multiplexing interference,and improves the overall performance of a fully loaded network.