دانلود رایگان مقاله لاتین چند منبعی برای تعیین ابعاد شبکه داده از سایت الزویر
عنوان فارسی مقاله:
مدل چند منبعی برای تعیین ابعاد شبکه های داده
عنوان انگلیسی مقاله:
The multi-source model for dimensioning data networks
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Internet service providers need to predict the impact of traffic load on the quality of service perceived by their customers. This is increasingly important with the advent of high-speed internet access that tends to move congestion from the access to the backhaul, where resources are shared by several users. Internet traffic is most often modeled at flow level2, assuming some ideal bandwidth sharing between ongoing flows [1– 3,15,17,19,27]. Modeling traffic at packet level proves too complex and is hardly effective, given that users typically perceive quality of service at flow level [12]. In fact, the flow-level models of data networks can be considered as the analogues for the Erlang model of telephone networks and its extensions to multi-rate circuit-switched networks [5]. They have proved essential for both dimensioning [3,6,16,24,25,29] and traffic engineering [15,21,23,28]. These models rely on the implicit assumption that each user generates data flows in series, one after the other, so that bandwidth sharing occurs on the considered backhaul link only, and not on the user’s access line. In this paper, we relax this assumption and consider the more realistic case where users may generate several data flows in parallel, these flows having to share both the backhaul link and the user’s access line. It is not obvious how bandwidth is shared by end-to-end congestion control in this context. Proportional fairness is often considered as an adequate model [18,22,26]. It turns out to coincide with max-min fairness in the networks considered in the present paper. Since we look for closed-form expressions, we consider a slightly different allocation known as balanced fairness [7]. While the resulting expressions have already been presented in [4], we here resort to simulations to compare our results to those obtained under max-min fairness. We also use simulations to assess the impact of packet schedulers and buffer management schemes that impose max-min fairness at user level on the backhaul link. Existing models assume that flows are generated either according to a Poisson process (the so-called infinite-source model) or by n users, each alterning between the active state and the idle state (the so-called finite-source model) [5]; in both cases, each user has at most one flow in progress at any given time. Our model consists of n users, each generating data flows according to a Poisson process; in particular, there is no limit on the number of flows in progress coming from the same user. We refer to this model as the multi-source model, since each user can now be viewed as an independent source of flows, as opposed to previous models where there is a unique source of flows, able to generate either an infinite number or a finite number of flows in parallel.
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کلمات کلیدی:
dblp: Thomas Bonald dblp.uni-trier.de › Persons The multi-source model for dimensioning data networks. Computer .... Traffic Models for User-Level Performance Evaluation in Data Networks. International ... [PDF]here - Sites personnels de TELECOM ParisTech https://perso.telecom-paristech.fr/~bonald/cv.pdf T. Bonald and A. Prouti`ere, A queueing analysis of data networks, Chapter of the book. Queueing ... The multi-source model for dimensioning data networks. Networking 2002: Networking Technologies, Services, and Protocols, ... https://books.google.com/books?isbn=3540437096 Enrico Gregori - 2002 - Computers From a dimensioning point of view, we can have a safety margin for the link capacity, i.e., set the link capacity C as C /α, where C is obtained using the PS model ... and this gain increases with the number of sources and traffic burstiness. ... Data networks as cascades: explaining the multifractal nature of Internet WAN traffic. Probabilistic Constrained Optimization: Methodology and Applications https://books.google.com/books?isbn=1475731507 Stanislav Uryasev - 2013 - Mathematics With the increasing variety of ways in which networks are being used, coupled ... Because of the wide variety of traffic requirements, the design, dimensioning and ... models were applied to the design of the data networks (ARPANET, BITNET, ... The derivation of an effective bandwidth of a stochastic multi-service traffic is ... Jorma Virtamo - Citations - ResearchGate https://www.researchgate.net/profile/Jorma_Virtamo/citations?sorting=recent Article: Random waypoint mobility model in cellular networks ... The Multi-Source Model for Dimensioning Data Networks · Thomas Bonald, Céline Comte. What is conformed dimension? - Definition from WhatIs.com searchdatamanagement.techtarget.com › Data modeling › Database In data warehousing, a conformed dimension is a dimension that has the same meaning to ... Search the TechTarget Network ... A conformed dimension can exist as a single dimension table that relates to multiple fact tables within the same data ... Following a notion for SQL, architect creates NoSQL data modeling notation ...
