2,942 research outputs found
The OSU Scheme for Congestion Avoidance in ATM Networks: Lessons Learnt and Extensions
The OSU scheme is a rate-based congestion avoidance scheme for ATM networks
using explicit rate indication. This work was one of the first attempts to
define explicit rate switch mechanisms and the Resource Management (RM) cell
format in Asynchronous Transfer Mode (ATM) networks. The key features of the
scheme include explicit rate feedback, congestion avoidance, fair operation
while maintaining high utilization, use of input rate as a congestion metric,
O(1) complexity. This paper presents an overview of the scheme, presents those
features of the scheme that have now become common features of other switch
algorithms and discusses three extensions of the scheme
DTMsim - DTM channel simulation in ns
Dynamic Transfer Mode (DTM) is a ring based MAN technology that
provides a channel abstraction with a dynamically adjustable capacity.
TCP is a reliable end to end transport protocol capable of adjusting
its rate. The primary goal of this work is investigate the coupling
of dynamically allocating bandwidth to TCP flows with the affect this
has on the congestion control mechanism of TCP. In particular we
wanted to find scenerios where this scheme does not work, where either
all the link capacity is allocated to TCP or congestion collapse
occurs and no capacity is allocated to TCP. We have created a
simulation environment using ns-2 to investigate TCP over networks
which have a variable capacity link. We begin with a single TCP Tahoe
flow over a fixed bandwidth link and progressively add more complexity
to understand the behaviour of dynamically adjusting link capacity to
TCP and vice versa
Source Behavior for ATM ABR Traffic Management: An Explanation
The Available Bit Rate (ABR) service has been developed to support data
applications over Asynchronous Transfer Mode (ATM) networks. The network
continuously monitors its traffic and provides feedback to the source end
systems. This paper explains the rules that the sources have to follow to
achieve a fair and efficient allocation of network resources.Comment: IEEE Communications Magazine, November 1, 1996, vol 34, no11, pp50-5
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Survey of congestion control techniques for an ATM network
The emerging broadband integrated services digital network is expected to adopt ATM (Asynchronous Transfer Mode) as the transport network. This new network must support several classes of service with varying delay and loss requirements. It must also operate with link speeds in the hundreds of megabits per second and be scalable up to potential link speeds on the order of gigabits per second. The requirements to support multiple services and high speed make the congestion control in an ATM network difficult. This paper reviews sorne of the techniques for prevention and control of congestion in an ATM network
Internal Model Hop-by-hop Congestion Control for High-Speed Networks
This paper presents a hop-by-hop congestion control for highspeed networks. The control policy relies on the data exchange between adjacent nodes of the network (nearest-neighbour interaction). The novelty of this paper consists in the extensive use of Internal Model Control (IMC) to set the rates of the traffic flows. As a result, the proposed congestion control provides upper-bounds of the queue lengths in all the network buffers (overflow avoidance), avoids wasting the assigned capacity (full link utilisation) and guarantees the congestion recovery. Numerical simulations prove the effectiveness of the scheme
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