A Method with Node Autonomy to Preserve QoS in Networks with Per- Route Admission

Abstract

This paper presents a method called the Short Term Protection (STP) which is applied to fixed networks whereflows1 are constrained to follow specific routes, where the admission-process is distributed, per-route, and wherethe traffic is sensitive to delay (like MPEG4 traffic). The share of bandwidth of any route is protected, in the shortterm,against the traffic-increment of its intersecting-routes. In the long term, in every congested link, the share ofbandwidth between the routes that intersect at that link is proportional to the average relative measured demandsof those routes. The nodes act autonomously, without central administration. This method is expected to: 1) helpnetwork administrators to have confidence, within a time-frame , about the amount of bandwidth they count on forevery route; 2) allow a simple bandwidth management in the network, with prospect to be scalable to at least tensof nodes. This paper presents the general and detailed operation of the method, the evaluation of the method, bysimulations, including a comparison with other method, a discussion of a possible scenario of application,conclusions and possible paths for further research.