异构网络中基于吞吐量优化的资源分配机制

Throughput Optimization Based Resource Allocation Mechanism in Heterogeneous Networks

针对异构蜂窝网络中D2D(Device-to-Device)通信用户复用蜂窝用户上行信道产生的干扰问题和频谱资源分配优化问题,提出一种基于改进粒子群算法的D2D通信资源分配算法,并将该算法与改进的闭环功率控制算法相结合进行资源管理。此方案通过设置信干噪比(Signal-to-Interference Noise Ratio,SINR)门限值来保证用户的通信服务质量(Quality of Service,QoS),使用改进粒子群算法为D2D用户进行资源分配后,再通过基于接收信干噪比的闭环功率控制算法动态调整用户的发射功率,以减少干扰。仿真结果表明,该方案能够有效抑制异构通信系统中由于引入D2D用户导致的干扰问题,并提高频谱资源的利用率和系统的吞吐量。

Aiming at the problem of interference and spectrum resource allocation optimization caused by D2D (Devic e -to -Device)communication multiplexing uplink channel of heterogeneous cellular networks,this paper proposed a resource allocation scheme based on improved particle swarm optimization algorithm,and combined the proposed algorithm with the improved closed-loop power control algorithm for resource management.This scheme ensures user’s Quality of Service (QoS) by setting the Signal-to-Interference Noise Ratio (SINR) threshold.After the resource allocation is performed for the D2D user by using the improved particle swarm optimization algorithm,the user’s transmit power is dynamically adjusted by the closed-loop power control algorithm based on the received signal-to-interference noise ratio to reduce interference.Simulation results show that the proposed scheme can effectively suppress the interference problems caused by the introduction of D2D users in heterogeneous communication systems,and improve the utilization of spectrumand the throughput of the system.