Analysis And Study Of Flow Control Technology For High-speed Networks

There are mainly two kinds of high-speed network: 1. B-ISDN. 2. Broadband IP networkIn this paper, we analysis and study ABR flow control technology for ATM network and flow control technology for broadband IP network.In ATM network, there are five kinds of services, i.e., CBR, r.t-VBR, n.r.t-VBR, ABR and UBR. Among these five kinds of services, ABR has been widely used, but has more difficulty in flow control. ABR service use closed-loop control. Performance analysis and modification for ABR flow control is an important job. So far, the analysis of ABR flow control algorithms are mostly based on simulation and depend on empiric to improve algorithm, so it is important and difficult to build a systemic theory to analysis and design ABR flow control algorithm. There are several representative ABR flow control algorithms: APRCA, EPRCA, DMRCA, CAPCA, and ERICA+. In this paper, we will analysis these algorithms. In this paper, we analysis the stability of APRCA for the first time. Some work shows it has better performance than EPRCA. But in this paper, we show that this protocol is unstable in some conditions.. In this paper, improvement of APRCA referred to as APRCA_QT is presented. Furthermore, APRCA_QT augmented with a Minimum Variance Predictor has better performance man APRCAQT is proposed. With the same method proposed by this paper, we continue to analysis two other important ABR flow control algorithms, i.e., EPRCA and DMRCA. Both of them are ER-based and queue-length based. Through analysis, we found that EPRCA is unstable in some conditions and DMRCA is marginally stable. In this paper, we study performance (stability, sensitivity, convergence) of CAPCA. We will show that CAPCA is marginally stable and is sensitivity to many parameters. This paper presents improvement of CAPCA also. Through simulation, the improved version of CAPCA is stable. The network topology used in this paper is in general. In this paper, we study the stability of ERICA+ by using the theory of time-delay differential equation. The result shows that this algorithm is unstable in some conditions. Stable condition is proposed in...