中文说明：
针对覆盖组播中基于QoS的异构性问题，提出了一种拓扑设计方案（HeteTopo）。该方案旨在为异构多播服务构建一个具有差异QoS支持的拓扑树，同时优化相关的树成本指标。
English Description：
A topology design scheme (HeteTopo) is proposed to address the heterogeneity issue based on QoS in overlay multicast. This solution aims to build a topology tree with differentiated QoS support for heterogeneous multicast services, while optimizing relevant tree cost indicators