单播与多速率组播共存网络中的公平资源分配

以最大化网络用户效用值为目标,考虑组播接收者的异构性,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。该算法在IP网络中分布式实现时,路由器使用RED算法标记报文,反馈拥塞信息;用户端提取拥塞信息计算最优速率,并作相应更新。通过选择合适的算法参数及效用函数,单播与组播将依据比例公平性准则共享网络资源。仿真结果验证了该算法的有效性。另外,还分析了多速率组播分层实现时,不同的带宽离散化密度对资源分配公平性的影响。

Fair resource allocation in networks with coexisting unicast and multtrate multicast flows

Considering the heterogeneity of multicast receivers unicast and multicast missions are brought to unified convex program model research with the objective of maximizing network user utility and by applying a penalty function approach a heuristic rate control algorithm is derived. In the distributed implementative of the algorithm in IP networks. The routers employ RED algorithm to mark the text, the congestion information is fed back the end-users extract the congestion information to calcalate optimal rate and renew if correspondingly. With choice of apporpriate algorithm parameters and effect functions multicast and unicast sessions can share the network resources in the proportional fair manner. Simulation results verify the effectiveness of the algorithm. The effect of different bandwidth discrelization density upon resource allocation fairness in a layered implementation of multirate multicast.