Ad-hoc network communication requires efficient routing protocols to overcome the problems associated with unpredictable and dynamically changing topologies, which are mostly triggered by nodes mobility and non-existence of base stations and central controllers. We propose a performance evaluation model for blocking probability of multihop calls in ideal macrocell environment conditions using t...

Advances in computing and networking are generating a significant demand for video-on-demand (VOD) applications. In this paper, the condition for minimum blocking probability of a VOD system is derived. The optimal load-sharing requirement in such a system is found so that the minimum blocking probability is achieved. A combination of genetic algorithm and modified bin-packing algorithm is then...

We investigated the influence of network topology on light-path blocking probability in wavelength-routed optical networks (WRONs) carrying non-uniform traffic loads. Through extensive simulations of a number of similar networks, it is shown that even small differences in the topology can result in large variations in the blocking probability. The results of the simulations are used to assess t...

In this work, we study the blocking performance of the individual node: optical cross connects (OXC) with (full or limited) wavelength conversion in wavelength routed networks (WRON) based on the theory of probability. And a blocking probability model is proposed. Particularly, we pay more attention to investigate OXC's performance improvement by using more feasible limited wavelength conversio...

The generalized Engset model can be applied to evaluate the blocking probability at an optical cross connect (OXC) of bufferless optical burst switching (OBS) system. For tractability, previous studies assumed that burst transmission time (on-time) and time intervals between bursts provided by the same input channel (off-time) are exponentially distributed. Here we aim to study the sensitivity ...

In cellular mobile communication system the existing dynamic channel allocation scheme suffer from high blocking probability and forced termination probability. To mitigate this problem, in this paper we evaluated the performance of dynamic channel allocation scheme based on carrier-to-noise interference ratio. In our system model, uplink power strength from a call-initiating user to the base s...

We propose an admission control policy for wireless multimedia networks that is based on the well known threshold-based guard channel method. The new scheme deals with two different types of traffic classes; namely: voice and data. We assume two different thresholds, one for each traffic class. In addition, we propose to buffer the handoff data calls if no free channels are available rather tha...

In this paper the performance of OVSF and NOVSF codes in WCDMA are evaluated by calculating their blocking probability and plotting graphs between blocking probability and new call arrival rate (request per minute) at different data rates (R, 2R, 4R and 8R where R can be either 8kbps or 16kbps). NOVSF is a new code assignment scheme which greatly reduces the code blocking problem. There are mai...

Abstract: The dimensioning of hardware components takes place at the end of the UMTS radio network planning process when a suitable NodeB site configuration has been found. Each connection to a NodeB requires a service specific number of hardware components and an incoming connection is blocked if not enough components are available. The aim of hardware dimensioning is to find the cost-optimal ...

This contribution deals with the blocking probability in a hierarchical network. In the considered model, a continuous coverage is made with micro-cells that accommodate both fresh calls and handover requests. Over this micro-cell coverage, umbrella-cells are implemented. These umbrella-cells only accept handover requests that cannot be managed by micro-cells. This hierarchy enables to reduce t...