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HFC频点带宽的分配是广播电视网络业务提供系统的一项关键技术,直接决定了系统的整体收益.描述了HFC频点带宽资源分配面临的问题,提出基于业务收益函数的频点带宽分配方法.在分析广电网络视频点播、时移电视和高速下载三种典型业务特性的基础上,给出了它们的收益函数,提出了一种基于边际效益的贪婪算法以完成资源的分配.该算法在保证业务质量满足最低要求的基础上,按照各类业务的实际需求分配可用的频点带宽,使系统的收益最大.仿真试验验证了该算法的有效性.
The distribution of HFC frequency bandwidth is a key technology of broadcast network service provision system, which directly determines the overall revenue of the system.Describes the problems of HFC frequency bandwidth resource allocation, and proposes a frequency bandwidth allocation method based on business revenue function Based on the analysis of three typical service characteristics of video on demand, time - shifted television and high - speed downloading in broadcast and television networks, their revenue functions are given and a greedy algorithm based on marginal benefit is proposed to allocate resources. On the basis of guaranteeing that the quality of service meets the minimum requirements, the available frequency bandwidth is allocated according to the actual needs of various types of services to maximize the benefits of the system. Simulation results show the effectiveness of the proposed algorithm.