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This paper describes how Quality of Service (QoS) support can be introduced to Overlay Multicast in a Chord Peer-to-Peer network. The authors support the concept of QoS classes (to support various hop-by-hop QoS parameters such as bandwidth requirements) as well as node to root Round Trip Time (RTT) constraints. Their evaluations show that they can guarantee QoS without changing the basic properties of Chord significantly. In order to enable QoS for Overlay Multicast, the multicast distribution tree has to hold certain QoS path properties. The QoS requirements/capabilities (e.g. bandwidth) of nodes have to monotonically decrease on the paths from the root to the leaf nodes in the tree.
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