In this paper we report the development and implementation of QoPS, Quality of Service (QoS) provision system, that provides QoS support for voice, video and data applications in home wireless networks. QoPS is indepe...
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ISBN:
(纸本)0819446475
In this paper we report the development and implementation of QoPS, Quality of Service (QoS) provision system, that provides QoS support for voice, video and data applications in home wireless networks. QoPS is independent of the network interface card and of the multimedia applications we run. The experimental results of our solution were obtained on a PC-Windows based testbed consisting of a home wireless network connected to the Internet via a residential gateway. The experimental results we have obtained provide evidence that our solution provides quality of service support for multimedia applications.
The current best effort approach to quality of service in the Internet can no longer satisfy a diverse variety of customer service requirements, and that is why there is a need for alternative strategies. In order to ...
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ISBN:
(纸本)081944250X
The current best effort approach to quality of service in the Internet can no longer satisfy a diverse variety of customer service requirements, and that is why there is a need for alternative strategies. In order to solve this problem a number of service differentiation models have been proposed. Unfortunately, these schemes often fail to provide proper service differentiation during periods of congestion. To deal with the issue of congestion, we introduce a new load control mechanism that eliminates congestion based on the feedback from the network core by dynamically adjusting traffic load at the network boundary. We introduce four methods for calculating load distribution among the ingress routers and among different flows in each ingress router, and we evaluate these proposed methods through simulation.
The proceedings contains 28 papers form the conference on scalability and traffic control in ip networks II. Topics discussed include: achieving fairness in multicasting with almost stateless rate control;scalable ser...
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The proceedings contains 28 papers form the conference on scalability and traffic control in ip networks II. Topics discussed include: achieving fairness in multicasting with almost stateless rate control;scalable service architecture for providing string service guarantees;observations on traffic flow patterns and traffic engineering practice;efficiency of TCP-friendly window adjustment strategies in wired/wireless networks;bandwidth provisioning for service overlay networks;internet worms and global routing instabilities;and results on the multiresolution structure of internet traffic traces;providing emergency services in internet telephony.
Mobile multimedia services such as TV-call or video streaming are gradually becoming popular in the 3rd generation mobile network (IMT-2000). Multimedia traffic is expected to continue increasing into the coming years...
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Mobile multimedia services such as TV-call or video streaming are gradually becoming popular in the 3rd generation mobile network (IMT-2000). Multimedia traffic is expected to continue increasing into the coming years, and ip technology is considered to be capable of efficiently transporting such huge volumes of multimedia traffic. Aimed at ALL-ip mobile networks, we are proposing the ip-based IMT Network Platform (ip(2)), which represents an evolution from IMT-2000. In this paper, we propose the Edge Intelligent Mobility Management Protocol (Elm) to enable ip mobility in future ALL-ip mobile networks to meet mobile operators' requirements. EIM employs the so-called network-controlled mobility management approach and conceals ip mobility from mobile nodes by processing user packet and mobility control at the edge node, access router. To verify feasibility and scalability, we have implemented EIM on our experimental system and conducted a series of tests. The results showed that processing delays for basic mobility operations are considerably small. It was also confirmed that the EIM is scalable regarding the increase of the number of mobile nodes and correspondent nodes.
Satisfying the Quality of Service (QoS) requirements is one of the main objectives in the design and implementation of ip-based Next Generation networks (NGN). This paper formalizes an efficient NGN resource-based cal...
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ISBN:
(纸本)9781424434701
Satisfying the Quality of Service (QoS) requirements is one of the main objectives in the design and implementation of ip-based Next Generation networks (NGN). This paper formalizes an efficient NGN resource-based call admission control (CAC) method which guarantees the QoS requirements expressed in terms of per-service traffic flow throughput, latency, jitter, loss and authorized waiting delay. The proposed method delivers high quality session-based services compliant with the available capacity over an NGN network based ip/MPLS transport infrastructure. The effects of the proposed method on the QoS provision are demonstrated through modeling of the main QoS parameters. Numerical simulations, which illustrate the proposed method benefits in terms of QoS guarantees and transport network scalability, are also presented.
New architectural requirements appear with the evolution of mobile networks, such as the provisioning of multihoming or offloading. In general, this requires the design of ad hoc schemes on top of the EPS, which may b...
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New architectural requirements appear with the evolution of mobile networks, such as the provisioning of multihoming or offloading. In general, this requires the design of ad hoc schemes on top of the EPS, which may be seen as an indicator of the need for a back-to-basics architectural analysis. This article analyzes the basic architectural principles of the EPS, and compares them with those of SDN and LISP. We then describe an evolutionary path for the EPS, by showing how, with slight modifications inspired by SDN and LISP, future mobile carrier networks could natively fulfill some of their flexibility and scalability requirements. The key design principles for that are: a generalized use of traffic flow templates (i.e., 5-tuple flows) for more flexible ip flow handling;a full decoupling of control and user plane for flexibility;and an on-demand (or pull-based) state setting at network nodes for scalability. Some examples are given to illustrate the thesis of this article.
This paper presents a formal study on channelized bandwidth resource provisioning for multi-rate and multi-session video broadcast in a broadband wireless network with heterogeneous users. The formulation is generic i...
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ISBN:
(纸本)0819446475
This paper presents a formal study on channelized bandwidth resource provisioning for multi-rate and multi-session video broadcast in a broadband wireless network with heterogeneous users. The formulation is generic in that it considers both inter-session and intra-session wireless resource allocation. It also takes into account the most fundamental issues associated with video transmission including encoding complexity, transport overhead, non-linear relationship between the receiver perceived video quality and the delivered bandwidth, and intra- and inter-session fairness. In addition, we derive an optimal allocation scheme to manage the scarce wireless resources.
Selective packet dropping policies have been used to reduce congestion and transmission of traffic that would inevitably be retransmitted. For data applications using best-effort services, packet dropping policies (PD...
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Selective packet dropping policies have been used to reduce congestion and transmission of traffic that would inevitably be retransmitted. For data applications using best-effort services, packet dropping policies (PDPs) are congestion management mechanisms implemented at each intermediate node that decide, reactively or preactively;to drop packets to reduce congestion and free up precious buffer space. While the primary goal of PDPs is to avoid or combat congestion, the individual PDP designs can significantly affect application throughput, network utilization, performance fairness, and synchronization problems with multiple Transmission control Protocol(TCP) connections. scalability and simplicity are also important design issues. This article surveys the most important selective packet dropping policies that have been designed for best-effort traffic in ATM and ipnetworks, providing a comprehensive comparison between the different mechanisms.
Two important factors for the realistic simulation of web-traffic are the heavy-tailed distributed file-sizes at the session level, and the transmission control protocol (TCP) at the transport level. The operation of ...
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Two important factors for the realistic simulation of web-traffic are the heavy-tailed distributed file-sizes at the session level, and the transmission control protocol (TCP) at the transport level. The operation of a source that integrates both factors faces two major scalability problems: the computing resources required by each source put a limit on the total number of sources that can be simulated, and the number of discrete events in the context of high capacity networks leads to unacceptably long simulation times. We introduce a light weight traffic source (LWTS). It generates traffic statistically similar to the traffic produced by a realistic source. Similar to a realistic source, it generates heavy-tailed distributed files at the session layer. However, its transport operation is based on a pseudo-TCP (P-TCP) protocol that approximates TCP. The thin code of P-TCP makes LWTS similar to 50 times less resource hungry as compared to a realistic traffic source. To solve the second scalability problem, we introduce a novel abstraction technique at the transport level: we send a whole window of TCP packets as one big packet. This abstraction results in reducing the number of discrete events leading to similar to 28 times faster simulations. (c) 2005 Elsevier GmbH. All rights reserved.
Connectivity within ad-hoc and peer-to-peer networks undergoes constant change. One approach to reducing the cost of finding information within these networks is to replicate the information among multiple points with...
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ISBN:
(纸本)0819446475
Connectivity within ad-hoc and peer-to-peer networks undergoes constant change. One approach to reducing the cost of finding information within these networks is to replicate the information among multiple points within the network. A desirable replication approach should cache copies of all pieces of information as close to each node as possible without exceeding the storage resources of the nodes within the network. In addition, the approach should require minimum communication overhead among participating nodes and should adjust the locations of stored content as connectivity within the network changes. Here, we formulate this caching problem as a graph coloring problem, where the color of the node determines the content that the node should store. We present a distributed algorithm where each node chooses its color in a greedy manner, minimizing its own distance to the color furthest from it. We demonstrate convergence of this algorithm and evaluate its performance in the context of its ability to place information near all nodes in the network.
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