Congestion control strategies in ATM networks (original) (raw)

Dynamic bandwidth control in ATM networks

Computer Communications, 1999

The Asynchronous Transfer Mode (ATM) principle has been recommended by the ITU as the transport vehicle for future Broadband ISDN Networks. One of the most important objectives of ATM-based networks is to support multimedia traffic services. The multimedia traffic is a diverse mixture of several types of traffic (e.g., video, voice, image, data) that have different correlations, burstiness characteristics and quality of services (QoS) requirements form the network. Efficient bandwidth allocation and access control algorithms are required to ensure (and maintain) specific QoS requirements for each type of traffic. In this article, we propose and analyze a dynamic bandwidth allocation and control scheme based upon the virtual path (VP) principle. The scheme exploits the statistical multiplexing gain principle in order to increase the bandwidth utilization per VP. It allocates a certain amount of bandwidth to each VP that is necessary to meet the QoS requirements of the traffic carried by that VP. Each VP carries only homogeneous traffic (i.e., traffic with similar characteristics and QoS requirements are supported by a single VP). To dynamically control the allocated path-bandwidth a Bandwidth Control Period (BCP) rule is proposed to control the scheduling of different types of traffic that are supported by separate VPs. It is shown that with proper choice of the BCP, a pathbandwidth can be allocated to guarantee QoS required by the traffic. The scheme is dynamic in the sense that the bandwidth allocated, per VP, depends upon the number of accepted calls and variations in the traffic characteristics. Further, it is shown that access flow control is essential in order to minimize the cell loss rate and enhance the statistical multiplexing gain per VP. ᭧

Traffic Control in ATM Networks

Computer Networks and Isdn Systems, 1994

This paper presents a framework to study the problem of traffic control in ATM networks. Bursty traffic sources are modelled by Interrupted Bernoulli Processes. Probability of violation and dimensioning issues are adr.lressed for the leaky bucket mechanism and the (L, M, T) mechanism, proposed by the authors. We present two schemes to demonstrate that improved statistical multiplexing can be achieved if the traffic control mechanisms are not used in isolation for each session, rather theyare used on groupsof sessions. In the first scheme, traffic controlis performed on the aggregate traffic of a group. In the secondscheme, traffic controlis performed on single sessions with Information about the status of all the sessions of the group beingavailable and used at each traffic control mechanism. Numerical examples that illustrate the improvementin statistical multiplexing as a result of the aboveschemes are presented.

A novel congestion control strategy in ATM networks

Computers & Industrial Engineering, 1993

In order to guarantee a committed Quality of Service (QoS) to the users of a Broadband Integrated Services Digital Network (B-ISDN), preventive congestion control becomes critical, and is implemented through Call Acceptance Control (CAC), Usage Parameter Control (UPC), and Space Priority functions. Currently, Asynchronous Transfer Mode (ATM) cells are equipped with a 1-bit Cell Loss Priority (CLP) field, which can be used for serviceoriented and/or UPC marking. This creates a conflict, since these two marking approaches may have contradicting objectives, and are designed to operate independently. Moreover, by admitting excessive cells as marked traffic, this group is allowed to grow uncontrollably, thereby jeopardizing the QoS committed to other (low priority) marked cells.

Traffic management Congestion Control Scheme in ATM Networks

2013

The problem of traffic management has been widely recognized as critical to the development of an operational Internet. The goal of traffic management is to efficiently allocated network resources including buffers and bandwidth and provides the negotiated QoS guarantees to users. Rate based Congestion control schemes promises effective traffic management for the ABR service class suitable to data communications in ATM networks. A rate based scheme uses feedback information from the network to specify the maximum rate at which each source can transmit cells in to the network on every VC. In this paper, we considered an efficient rate based congestion scheme, Explicit Rate Indication Congestion Avoidance (ERICA) for ATM networks. An improvement to ERICA scheme is proposed by varying the target rate dynamically.

A Novel Simulation Based Methodology for the Congestion Control in ATM Networks

In this project, we use the OPNET simulation tool for modeling and analysis of packet data networks. Our project is mainly focused on the performance analysis of Asynchronous transfer mode (ATM) networks. Specifically, in this project, we simulate two types of high-performance networks namely, Fiber Distributed Data Interface (FDDI) and Asynchronous Transfer Mode (ATM). In the first type of network, we examine the performance of the FDDI protocol by varying network parameters in two network configurations. In the second type, we build a simple ATM network model and measure its performance under various ATM service categories. Finally, we develop an OPNET process model for leaky bucket congestion control algorithm and examine its performance and its relative effect on the traffic patterns (loss and burst size) in an ATM network. Our simulation results show that the ATM network has longer response time than FDDI. On the other hand, it shows that for both token ring and MAC delay, ATM is shorter than FDDI I.

Survey of Traffic Control Schemes and Error Control Schemes for ATM Networks

1991

Among the techniques proposed for B-ISDN transfer mode, ATM concept is considered to be the most promising transfer technique because of its flexibility and efficiency. This paper surveys and reviews a number of topics related to ATM networks. Those topics cover congestion control, provision of multiple classes of traffic, and error control. Due to the nature of ATM networks, those issues are far more challenging than in conventional networks. Sorne of the more promising solutions to those issues are surveyed, and the corresponding results on performance are summarized. Future research problems in ATM protocol aspect are also presented.

Modeling of Congestion and Traffic Control Techniques in ATM Networks

American Journal of Networks and Communications, 2015

In this Paper, Computer-based Simulation models for effective Congestion control and Traffic management in Asynchronous Transfer Mode (ATM) network have been developed providing a basis for monitoring ATM networks performance for traffic and congestion control purposes ,providing a system with a reduce short-term congestion in ATM networks, and enhancing a fair operation of networks in spite of the challenges in designing ATM traffic management system to make maximal use of network resources. An IDCC scheme was implemented, applying IDCC methodology to the ATM Network. Using analysis performance, limits were created for robust controlled network behaviour, as dictated by reference values of the desired queue length. By tightly controlling output of the controller, the overall network performance was adjusted and also controlled. A simulation tool, MATLAB/SIMULINK, was used for this purpose. An improvement was observed in the delay performance of ATM networks. The results were obtained by running several simulations and populating a table with the outcome over a number of simulation runs. The effectiveness of the congestion control techniques was tested by analysing the dynamic performance of the model through variation of some parameters. The performance of this model proved to be efficient if applied in the ATM network of today.

52-2007 A Survey of Congestion Control Schemes for ABR Services in ATM Networks

1998

Broadband integrated services digital network(B-ISDN) efforts are driven by the emerging needs for high-speed communications and enabling technologies to support new integrated services. Among the available technologies, asynchronous transfer mode (ATM) has emerged as a standard for supporting B-ISDN. ATM uses short, fixed-size cells consisting of 48 bytes of payload and 5 bytes of header in order to transmit information. The fixed size allows fast processing of cells and reduces the variance of delay, making the network suitable for integrated traffic consisting of voice, video, and data. Providing the desired QOS for these various traffic types is much more complex than what is done in data networks today.

Performance analysis of reactive congestion control for ATM networks

IEEE Journal on Selected Areas in Communications, 1995

In ATM networks, preventive congestion control is widely recognized for efficiently avoiding congestion, and it is implemented by a conjunction of connection admission control and usage parameter control. However, congestion may still occur because of unpredictable statistical fluctuation of traffic sources even when preventive control is performed in the network. In this paper, we study another kind of congestion control, i.e., reactive congestion control, in which each source changes its cell emitting rate adaptively to the traffic load at the switching node (or at the multiplexer). Our intention is that, by incorporating such a congestion control method in ATM networks, more efficient congestion control is established. We develop an analytical model, and carry out an approximate analysis of reactive congestion control algorithm. Numerical results show that the reactive congestion control algorithms are very effective in avoiding congestion and in achieving the statistical gain. Furthermore, the binary congestion control algorithm with pushout mechanism is shown to provide the best performance among the reactive congestion control algorithms treated here.

An approach to controlling congestion in ATM networks

International Journal of Digital & Analog Communication Systems, 1990

Determining approaches to congestion and flow control, especially real-time components in an overall strategy, is recognized as one of the fundamental challenges facing broadband 'packet-based' information transport, as, for instance, in the case of BISDN/ATM. In this paper we summarize basic issues underlying this subject, and describe a particular approach to achieving a multilayer broadband congestion, flow and error-control architecture, based on a 'core' congestion control strategy that we term bandwidth management. The modular and layered nature of this control architecture is described, and shown to lend itself to a structured approach to characterizing the control architecture performance.