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针对正交频分多址接入系统(OFDMA)下行链路资源分配问题,提出一种支持混合业务的跨层子载波-功率-比特联合分配算法.引入平均时延控制因子和丢包率控制因子作为时延敏感(DS)业务服务质量(平均时延和丢包率)的控制参数;每分配1个子载波后立即对该子载波所属用户进行一次最优的子载波功率和比特分配,该联合分配方案可最大化系统功率效率.仿真结果表明:该算法既可同时保证不同类型DS业务的服务质量,又可提高时延不敏感(NDS)业务的平均吞吐量并保证用户间的公平性.通过调整2个控制因子不仅能满足不同DS用户的服务质量要求,还可在DS用户服务质量和NDS用户的吞吐量间达到不同的折衷,以满足各种系统设计要求.
In order to solve the resource allocation problem of Orthogonal Frequency Division Multiple Access (OFDMA) downlink, a cross-layer subcarrier-power-bit joint allocation algorithm is proposed to support hybrid services. The average delay control factor and packet loss rate control Factor as a control parameter of delay-sensitive (DS) service quality of service (average delay and packet loss rate); once each sub-carrier is allocated, an optimum sub-carrier power and bit allocation are performed to the user to which the sub-carrier belongs The joint allocation scheme can maximize the system power efficiency.The simulation results show that the algorithm not only guarantees the quality of service of different types of DS services at the same time, but also increases the average throughput of NDS services and guarantees the fairness among users By adjusting two control factors, not only the service quality requirements of different DS users can be met, but also different compromises can be achieved between the quality of service of DS users and the throughput of NDS users to meet various system design requirements.