PCP : A Bandwidth Guaranteed Transport Service for IPnetworks

The increasing demand for a variety of new Internet services with diierent and possibly stringent QoS requirements (i.e. Internet Tele-phony, videoconferencing etc.) requires the design of mechanisms to support QoS guarantees. The current solutions proposed in IETF, RSVP (Resource reSerVation Protocol) and Diierentiated Services, though suitable for many applications, may result ineecient to support real-time services on a call basis. RSVP is not really scalable and requires substantial changes in the Internet architecture, while Diierentiated Services provide guarantees mostly on a static and permanent basis. In this paper we assume an Internet architecture supporting multiple priorities as needed in Diierentiated Services, and introduce PCP (Phantom Circuit Protocol), a mechanism that provides a guaranteed bandwidth transport service for circuit oriented connections. PCP includes a fully scalable Call Admission Control (CAC) and operates on a per call basis. Simulation of the protocol performance for CBR (Constant Bit Rate) traac under various network conditions show the adherence of the mechanism to theoretical expectations.