基于服务质量感知的异构无线网络负载均衡算法

QoS-aware load-balancing algorithm for heterogeneous wireless networks

为了实现合理的网络资源调度,提高异构无线网络资源利用率,提出了一种基于服务质量(Quality of service,QoS)感知的网间负载均衡算法。算法基于无线业务特征,定义了适用于异构网络的一般化终端收益函数和网络效用函数,分别用来表征终端的QoS体验和网络的负荷情况。算法迭代地把负荷最重的网络中QoS收益和资源利用效率较低的终端调度到能够提高该终端QoS收益的负荷最轻的网络中,直至达到网络负载平衡,实现网络资源的均衡利用,并有利于保证终端的QoS。仿真结果表明:算法能够有效地提高网络的吞吐量、降低业务的时延和丢包率。

For efficient network resources dispatching in heterogeneous wireless network scenarios,a Quality of Service（QoS） aware load-balancing algorithm was proposed.Based on the characteristics of different wireless services,the algorithm defines a utility function for each terminal to represent its QoS experience and a utility function for each Radio Access Network（RAN） to represent its load level.The definitions apply to all heterogeneous RANs.The algorithm conducts an iterative load-balancing procedure,where it always tries to handover a terminal,which is with low QoS utility and resource utilization served by the busiest RAN,to another RAN,which has the lightest load among the RANs.This RAN with the lightest load is capable of increasing the terminal′s QoS utility,until network load balance is reached.Such a procedure can help to realize better wireless resource deployment and ensure terminal QoS.Simulation results show that the proposed algorithm can effectively increase the throughput,reduce the time-delay and packet loss rate of the network.