Results 1 - 10
of
12
Throughput Analysis of End-to-End Measurement-Based Admission Control in IP
- In Proceedings of IEEE INFOCOM 2000, Tel Aviv
, 2000
"... This paper introduces approximate analytical models to evaluate the performance of End-to-end Measurement Based connection Admission Control (EMBAC) mechanisms, devised for the setup of real time flows over the Internet. These mechanisms rely on users probing the current congestion status of their r ..."
Abstract
-
Cited by 63 (1 self)
- Add to MetaCart
This paper introduces approximate analytical models to evaluate the performance of End-to-end Measurement Based connection Admission Control (EMBAC) mechanisms, devised for the setup of real time flows over the Internet. These mechanisms rely on users probing the current congestion status of their required network path using a succession of probing packets. If the probing rate measured at the end receivers is greater than a certain threshold, users are allowed to switch to a phase of data exchange; otherwise they abort the call setup attempts. In conformance with the differentiated services framework, routers are oblivious to individual flows, and only need to give higher priority to data packets than to probing traffic. Despite the approximations introduced to make the analysis tractable, our model appears to be extremely accurate for a scenario of constant rate connections. Much less accurate, but useful as a possible starting point for future work, is the extension of the model to a...
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 ..."
Abstract
-
Cited by 17 (0 self)
- Add to MetaCart
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 ..."
Abstract
-
Cited by 8 (3 self)
- Add to MetaCart
(Show Context)
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 (...
Distributed bandwidth reservation by probing for available bandwidth
- in Proc. IEEE International Conference on Networks 2003
, 2003
"... Abstract — For many applications in Internet protocol-based networks a guaranteed quality of service is crucial. A simple and scalable way of achieving this is to use the differentiated services architecture in conjunction with admission control. In this research, we focus on the reservation of band ..."
Abstract
-
Cited by 3 (3 self)
- Add to MetaCart
(Show Context)
Abstract — For many applications in Internet protocol-based networks a guaranteed quality of service is crucial. A simple and scalable way of achieving this is to use the differentiated services architecture in conjunction with admission control. In this research, we focus on the reservation of bandwidth by routers on the edge of a single network domain with differentiated services support. We evaluate the assumptions made by previous research on probe-based bandwidth reservation. The availability of bandwidth is determined by measuring the throughput a probe flow of a certain rate achieves while the reservation is accomplished by assuming that the throughput this probe flow achieves equals to an amount of reserved bandwidth.
Endpoint Admission Control over Assured Forwarding PHBs and its performance over RED implementations
"... ABSTRACT. The Assured Forwarding Per Hop Behavior (AF PHB) has been devised by the IETF Differentiated Services (DiffServ) working group to provide drop level differentiation. The intent of AF is to support services with different loss requirements, but with no strict delay and jitter guarantees. An ..."
Abstract
- Add to MetaCart
ABSTRACT. The Assured Forwarding Per Hop Behavior (AF PHB) has been devised by the IETF Differentiated Services (DiffServ) working group to provide drop level differentiation. The intent of AF is to support services with different loss requirements, but with no strict delay and jitter guarantees. Another suggested use of AF is to provide differentiated support for traffic conforming to an edge conditioning/policing scheme with respect to nonconforming traffic. Scope of this paper is twofold. First, we show that, quite surprisingly, a standard AF PHB class is semantically capable of supporting per flow admission control. This is obtained by adopting the AF PHB as core routers forwarding mechanism in conjunction with an End Point Admission Control mechanism running at the network edge nodes. The performance achieved by our proposed approach depend on the specific AF PHB implementation running in the core routers. In the second part of the paper, we prove that changes in the customary AF PHB implementations are indeed required to achieve strict QoS performance. To prove this point, we have evaluated the performance of our admission control scheme over a simple AF implementation based on RED queues. Our results show that, regardless of the selected RED thresholds configuration, such an implementation is never capable of guaranteeing tight QoS support, but is limited to provide better than best effort performance. 1
Index..........................................................................................................................................iii
"... Chapter I.......................................................................................................................................5 IP network architectures for QoS...............................................................................................5 §1.1 IP network models... ..."
Abstract
- Add to MetaCart
(Show Context)
Chapter I.......................................................................................................................................5 IP network architectures for QoS...............................................................................................5 §1.1 IP network models......................................................................................................7
Assessment of Voice over IP as a Solution for Voice over ADSL
, 2002
"... Voice over DSL (VoDSL) is a technology that enables the transport of data and multiple voice calls over a single copper-pair. VoDSL employs packet voice technology instead of the traditional circuit switched voice. Voice over ATM (VoATM) and Voice over IP (VoIP) are the two main alternatives for car ..."
Abstract
- Add to MetaCart
(Show Context)
Voice over DSL (VoDSL) is a technology that enables the transport of data and multiple voice calls over a single copper-pair. VoDSL employs packet voice technology instead of the traditional circuit switched voice. Voice over ATM (VoATM) and Voice over IP (VoIP) are the two main alternatives for carrying voice packets over DSL. ATM is currently the preferred technology, since it offers the advantage of ATM’s built-in Quality of Service (QoS) mechanisms. IP, on the other hand, cannot provide QoS guarantees in its traditional form. IP QoS mechanisms have been evolved only in the recent years. VoIP has gained popularity in the core networks. If it could replace VoATM in the access networks, it would open the door for end-to-end IP telephony that would result in major cost savings. In this thesis, we propose a VoIP-based VoDSL architecture that provides QoS guarantees comparable to those offered by ATM in the DSL access network. Our QoS architecture supports Premium and Regular service categories for voice traffic and the Best-Effort service category for data traffic. Voice and data packets are placed in separate output queues at the bottleneck link. The Weighted Fair Queuing algorithm in
OnlineTrafficEngineeringandConnectionAdmissionControlBasedonPath
"... In this paper,we outline anew connection admission controlandonlinetrafficengineeringframeworkforsmallnetworks using differentiated services. Decisions are made at the edge routers of the network. Multiple label switched paths are set up between each pair of edge routers. When anew connection arrive ..."
Abstract
- Add to MetaCart
(Show Context)
In this paper,we outline anew connection admission controlandonlinetrafficengineeringframeworkforsmallnetworks using differentiated services. Decisions are made at the edge routers of the network. Multiple label switched paths are set up between each pair of edge routers. When anew connection arrives at an edge router,each path is evaluated to see whether it is able to carry the connection. Then, the best path of the remaining ones is picked. The evaluation of paths is based on state information gathered from the queues on each path. Weshow the results this scheme achieves based on simulations. 1.
Adaptive Measurement-Based Traffic Engineering in Packet-Switched Radio Access Networks Approved by:
, 2004
"... To my past and present friends in Atlanta — you all made this time here so worthwhile. ACKNOWLEDGEMENTS First of all, I would like to express my deepest gratitude to my advisor Dr. Henry Owen for his continuous support and guidance throughout my studies and the trust he put in me. I would also like ..."
Abstract
- Add to MetaCart
(Show Context)
To my past and present friends in Atlanta — you all made this time here so worthwhile. ACKNOWLEDGEMENTS First of all, I would like to express my deepest gratitude to my advisor Dr. Henry Owen for his continuous support and guidance throughout my studies and the trust he put in me. I would also like to thank the members of my committee, Dr. George Riley, Dr. Randal Abler, who both also taught two amazing networking classes that enabled me to write this thesis, Dr. Chuanyi Ji, and Dr. Jun Xu. Furthermore, I would like to express my grateful appreciation to Siemens AG in Munich, foremost to Joachim Sokol, Hans-Peter Huth, and Joachim Grimminger, who supported and funded this research project. My lab partners were always a great aid and helped me with ideas, discussions, and coffee breaks throughout this research. Thanks to all of you! Last but not least I want to acknowledge my roommate and friend Michael Kettner, who pointed out that every good thesis should contain at least one integral. This one is for you: � f(x)dx.
pl of voice over IP over ADSL
, 2003
"... and Regular service categories for voice traffic and the Best-Effort service category for data traffic. The Weighted Fair Quality of service (QoS) remains an important issue for access networks. While in core networks tions, this is typically not feasible in access net-works. In this paper, we propo ..."
Abstract
- Add to MetaCart
(Show Context)
and Regular service categories for voice traffic and the Best-Effort service category for data traffic. The Weighted Fair Quality of service (QoS) remains an important issue for access networks. While in core networks tions, this is typically not feasible in access net-works. In this paper, we propose a simple method to support service differentiation between voice and data flows in Asymmetric Digital Subscriber Line (ADSL). Digital Subscriber Line (DSL) refers to a col-lection of technologies used for the transmission of Computer Networks 44 (20Corresponding author.
