1,720,963 research outputs found
A two-level stochastic approximation for admission control and bandwidth allocation
No full textIn an access node to a multiservice network [e.g., a
base station in an integrated services cellular wireless network or
the optical line terminal (OLT) in a broad-band passive optical
network (PON)], the output link bandwidth is adaptively assigned
to different users and dynamically shared between isochronous
(guaranteed bandwidth) and asynchronous traffic types. The
bandwidth allocation is effected by an admission controller,
whose goal is to minimize the refusal rate of connection requests
as well as the loss probability of cells queued in a finite buffer.
Optimal admission control strategies are approximated by means
of backpropagation feedforward neural networks, acting on the
embedded Markov chain of the connection dynamics; the neural
networks operate in conjunction with a higher level bandwidth
allocation controller, which performs a stochastic optimization
algorithm. The case of unknown, slowly varying input rates
is explicitly considered. Numerical results are presented that
evaluate the approximation and the ability to adapt to parameter
variations
Neural approximation of resource allocation functions in multiservice access multiplexers
No full textQuality of Service control in multimedia network clusters
No full textWe introduce a control architecture in which several (independent) multimedia clusters share the same
(local or metropolitan) networking resources in a controlled framework. In particular, a central entity (i.e.,
the Gatekeeper) harmonizes the transmission rates of the various clusters following a given sharing policy.
Each cluster, in turn, adopts its own end-to-end rate control mechanism to meet the Gatekeeper’s
transmission rate indications. A testbed has been developed and the system has been evaluated with real
experiments by using different types of transmission sources. A software architecture is also introduced and
described, with particular reference to the middleware framework realized with the Jini system
Load estimation and control in best-effort network domains
No full textA mechanism for the estimation of the available bandwidth between two end-points
of a best-effort network is presented. The estimation is obtained by a simple statistical
analysis of the effect that the network has on a synchronous train of packets.
The possibility of exploiting self-similar characteristics of the delay jitters is also
discussed, and a possible use of the estimates for management actions is suggested
A combined Forward Error Control and multiple access protocol for wireless voice/data integration
No full textAn adaptive neural network admission controller for dynamic bandwidth allocation
No full textIn an access node to a hybrid–switching network
(e.g., a base station handling the downlink in a cellular wireless
network), the output link bandwidth is dynamically shared
between isochronous (guaranteed bandwidth) and asynchronous
traffic types. The bandwidth allocation is effected by an admission
controller, whose goal is to minimize the refusal rate of
connection requests as well as the loss probability of packets
queued in a finite buffer. Optimal admission control strategies
are approximated by means of backpropagation feedforward
neural networks, acting on the embedded Markov chain of the
connection dynamics. The case of unknown, slowly varying, input
rates is explicitly considered. Numerical results are presented,
comparing the approximation with the optimal solution obtained
by dynamic programming
A general framework for networked multimedia applications enabling access to laboratory equipment: The LABNET project experience
No full textThe issue of accessing remote complex laboratories in a networked environment and performing experiments and measurements in which several applications and diverse devices are involved is addressed. A proposal is described for a common architecture for enhanced multimedia remote device control. The aim is to have the ability to set up a "gate" device that is the structured sum of real devices (from routers to microscopes) and virtual ones (e.g. software applications). The architecture exploits the most recent WWW "products", using the flexibility of embedding Java within a middleware framework. The authors do not claim that this will be "the" common architecture in such environment, but this exercise is useful for highlighting a number of problems through the proposal of different sets of solutions. The definition and initial implementation of this concept is part of the activities carried on within the framework of the LABNET project, at the CNIT Multimedia Communications Laboratory in Naples, Italy. The project, which started in April 2000, aims at the implementation of tools for network access to real laboratories and the management of experiments at a distance. The main structure of the project and the on-going activities are also briefly described
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