Quality of Service in Heterogeneous Distributed Systems

The future distribute dsystems will be very heteroge ne ous They will consist of end computing systems with widely varying capabilities inter connected by networks which o er very di erent services Delivering data with a guarante edlevel of servic e is a real problem that re quir es both support at the network level integrated ser vices networks and a QoS Quality of Servic e man agement envir onment This paper describes a simple and exible approach to QoS management This ap proach is based on resource reservation by the way of tra c control and application dynamic adaptation It aimsattemps to provide a simple ans e cient solution to the best possible quality of transmission consider ing the level of resource reserved and the current net work load Our appr oach is compared to other classic QoS archite ctur es It is analysed and evaluated with an exp erimental implementation in the Internet envi