基于QoS保证的协作OFDMA系统无线资源分配算法

QoS aware resource allocation in cooperative OFDMA systems

现有基于中继协作的正交频分多址接入(orthogo-nal frequency division multiple access,OFDMA)系统的无线资源分配算法主要面向单一业务和用户需求。该文研究了基于服务质量(quality of service,QoS)保证和异质业务的协作OFDMA系统无线资源分配问题,建立了以最大化系统效用函数为目标的模型,联合了功率控制、载波分配和中继选择。对于具有指数阶复杂度的原混合整数规划问题,通过引入QoS价格因子,将其转化为一个凸优化问题,并且提出了一个基于双层对偶分解的资源分配算法。仿真结果表明:该方法能显著提高系统对异质业务的支持能力,并保证用户之间的公平性。

Most existing resource allocation systems for cooperative orthogonal frequency division multiple access（OFDMA） systems have focused on homogeneous users with the same service and demand levels.This paper focuses on resource allocation in a service differentiated cooperative OFDMA system with quality of services（QoS） guarantees.The analysis formulates the joint power allocation,relay selection and subcarrier assignment to maximize overall system utility.A QoS price is introduced to correct the combinatorial problem with exponential complexity into a convex problem with a two-level dual-primal decomposition based QoS-aware resource allocation algorithm used to solve the problem.Simulations show that this algorithm significantly outperforms previous works in terms of QoS guarantees and system fairness.