A-Serv: A Novel Architecture Providing Scalable Quality of Service

Providing Quality of Service (QoS) is more and more critical in Internet. Well known QoS architectures include Integrated Services (IntServ), Differentiated Services (DiffServ), and Dynamic Packet State (DPS). QoS architectures define mechanisms and functions to ensure that the service guarantees are indeed enforced in the network. In this paper, we propose a novel QoS architecture called Adaptive Services (A-Serv), which utilizes Load Adaptive Router to provide QoS to data flows. A-Serv overcomes the scalability problem of IntServ, provides better guaranteed service to individual data flows than DiffServ and can be deployed gradually. Our simulation results show that compared with DiffServ architecture, A-Serv can provide differentiated services to the data flows in the same DiffServ class and provide guaranteed QoS to part of the data flows. Furthermore, A-Serv provides better protection to the data flows than DiffServ when malicious data flow exists. 1. INTRODUCTION Today's Internet only provides best-effort service, where traffic is processed as quickly as possible, and there is no guarantee to the quality of service (QoS) for data flow. Here, a data flow is composed of the packets with the same flow ID, which is normally represented by 5-tuple (source IP address, destination IP address, transport protocol, source transport protocol port, and destination transport protocol port). QoS refers to the capability of a network to provide better service to selected network traffic.