异构组播网络中效用最大化的速率控制算法

针对单播和多速率组播共存网络中资源最优分配问题，本文以用户效用最大化为目标，考虑组播异构性，将单播和组播任务纳入统一的凸规划模型研究，并应用惩罚函数法推导出一种启发式速率控制算法。仿真结果表明该算法能保证单播与多速率组播公平共享网络资源，算法选择不同的效用函数可使资源分配满足不同的公平性准则，资源利用获得不同的效率。

A Utility Maximizing Rate Control Algorithm in Multicasting Networks

In this paper, we address the optimal resource allocation problem in networks with unicast and multirate multicast sessions. With the purpose of maximizing the aggregate user utility, we use a unified convex program formulation to integrate unicast and multicast sessions into a common framework, keeping in mind the heterogeneity of the multicast sessions. By applying a penalty function approach, a heuristic rate control algorithm is derived. Simulation results show that the algorithm guarantees the fair coexistence of TCP-based unicast sessions with multirate multicast sessions. It is also shown that various fairness criteria of resource allocation could be achieved by choosing appropriate utility functions, and resource-utilizing efficiency would be likewise different.