The concept of setupless and stateless QoS routing was proposed in this paper.The key idea in implementation of stateless QoS routing lies in:(1)how to insert application's QoS requirements into IP packet header;(2)how to efficiently design forwarding strategy of a router.Combined with certain QoS-based routing heuristics
several novel solutions were proposed.The proposed stateless QoS routing schemes maximize the utilization of best-effort routing entries and are scalable