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Endpoint admission control with delay variation measurements for QoS
- in IP networks,” ACM Computer Communication Review
, 2002
"... In this paper we describe a novel Endpoint Admission Control scheme (EAC) for IP telephony. EAC mechanisms are driven by independent measurements taken by the edge nodes on a flow of packets injected in the network to probe the source to destination path. Our scheme is characterized by two fundament ..."
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In this paper we describe a novel Endpoint Admission Control scheme (EAC) for IP telephony. EAC mechanisms are driven by independent measurements taken by the edge nodes on a flow of packets injected in the network to probe the source to destination path. Our scheme is characterized by two fundamental features. First, it does not rely on any additional procedure in internal network routers other than the capability to apply different service priorities to probing and data packets. Second, the connection admission decision is based on the analysis of the probing flow delay variation statistics. Simulation results, which focus on a IP telephony scenario, show that, despite the lack of core routers cooperation, toll-quality performance figures (99th delay percentiles not greater than few ms per router) can be obtained even in severe overload conditions. Finally, a comparison with an EAC scheme driven by probe losses only, shows that the use of delay variation statistics as endpoint decision criterion is a key factor for EAC effectiveness.
VBR bandwidth-guaranteed services over DiffServ networks
- IEEE RTAS Workshop
, 1999
"... PCP (Phantom Circuit Protocol) is a mechanism that provides a guaranteed-bandwidth transport mechanism in IP networks. It includes an effective Call Admission Control (CAC) protocol and operates ona per call basis, as in circuit switched networks. In this respect PCP presents the same capabilities a ..."
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Cited by 8 (3 self)
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PCP (Phantom Circuit Protocol) is a mechanism that provides a guaranteed-bandwidth transport mechanism in IP networks. It includes an effective Call Admission Control (CAC) protocol and operates ona per call basis, as in circuit switched networks. In this respect PCP presents the same capabilities as RSVP, but, unlike RSVP, PCP is fully scalable since the CAC procedure is completely distributed, involves only network access points and does not require network routers to exchange any call set-up signaling. Up to now, the validity of the mechanism has been demonstrated with respect to Constant Bit Rate traffic. In this paper we show how PCP operation can be extended to Variable Bit Rate traffic. Our approach is fully compatible with other Differentiated Services since a proper interaction among the new traffic aggregate and the other traffic can be defined according to the PHBs description rules. 1. Introduction The Internet is emerging as an alternative to Asynchronous Transfer Mode (...
An End-to-End QoS Framework with On-Demand Bandwidth Reconfiguration
"... Abstract--- This paper proposes a new QoS framework, called the On-Demand QoS Path framework (ODP). ODP provides end-to-end QoS guarantees to individual flows with minimal overhead, while keeping the scalability characteristic of Diff-Serv. ODP exercises per-flow admission control and end-toend band ..."
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Abstract--- This paper proposes a new QoS framework, called the On-Demand QoS Path framework (ODP). ODP provides end-to-end QoS guarantees to individual flows with minimal overhead, while keeping the scalability characteristic of Diff-Serv. ODP exercises per-flow admission control and end-toend bandwidth reservation at the edge of the network and only differentiates traffic classes in the core of the network. In addition, to adapt to dynamically changing traffic load, ODP monitors the bandwidth utilization of the network and performs dynamic bandwidth reconfiguration in the network core. Through extensive simulations, the performance of ODP is investigated and compared with that of IntServ and DiffServ frameworks. The simulation results clearly show that ODP provides end-to-end QoS guarantees to individual flows, which DiffServ can not provide, with much less overhead than Int-Serv. Keywords: End-to-End QoS; DiffServ; IntServ over DiffServ,
