The well-known Clos network has been extensively used for telephone switching, multiprocessor interconnection and data communications. Much work has been done to develop analytical models for understanding the routing blocking probability of the Clos network. However, none of the analytical models for estimating the blocking probability of this type of network have taken into account the very r...

The rapid development of telecommunication networks is driven by user demands for new applications and advances in technologies. The explosive growth of the internet traffic is due to its use for collecting the information, communication, multimedia application, entertainment, etc. These applications are imposing a tremendous demand for bandwidth capacity on telecommunication network. The intro...

All-Optical Networks require end-to-end lightpaths to be established for traffic to flow, given that there are no wavelength converters present in the network. It is shown that as the lightpaths traverse more hops, the blocking probability increases. This is causes the Fairness Problem. We introduce the Traffic Classification and Service Method (ClaServ), which optimizes the Fairness Problem, a...

Code division multiple access (CDMA) technique is used widely since it can flexibly support multi-rate multi-media services by changing the number of orthogonal spreading codes. In this paper, we present a new adaptive code assignment algorithm, which consists of three steps: reserved-space, improved-crowded-first-space, and multi-code combination to fully use the code space. Compared with the ...

A three-stage circuit-switched Clos network, under various routing control strategies is considered for multicast operation. It was found that, under certain assumptions, this network become nonblocking as the number of middle switches increases. Also ,it was demonstrated that blocking probability can be reduced by certain modifications applied to its links. Key-Words: Multicast, simulation, bl...

In this paper, we propose a novel and simple soft handoff algorithm That helps fair distribution of network resources among users. Due to centralized soft handoff mechanism, no further computational complexity is added to the mobile sets. Because we use Fuzzy Inference system (FIS) in adapting thresholds of our algorithm, algorithm is able to release the traffic channels at high traffic load fo...

The paper presents a scheme for admission control at call set-up level at an ATM node. The traffic is considered to be divided into classes, characterized by statistical parameters like peak and average bandwidth, and by Quality of Service (QoS) requirements that allow us to define a ‘feasibility region’ where such requirements are guaranteed. A model to describe the ‘call admission’ is propose...

The paper shows that in the analysis of a queuing system with fixed-size batch arrivals, there emerges a set of polynomials which are a generalization of Chebyshev polynomials of the second kind. The paper uses these polynomials in assessing the transient behaviour of the overflow (equivalently call blocking) probability in the system. A key figure to note is the proportion of the overflow (or ...

that the blocking probabilities for networks with wavelength conversion are lower than for networks without wavelength conversion. This is because the alternate routes are of length two hops and thus blocking due to the wavelength continuity constraint is experienced on the alternate routes. Figure 6 shows that at high ooered loads, the blocking probability experienced with wavelength conversio...