In this paper, the blocking probability in a cellular network implementing directed retry (DR) is analyzed as a function of the main characteristics of the scenario (the density of base stations), the propagation model (path loss and shadowing), and the speed of mobiles. The analytical approach allows the evaluation of the blocking probability as a function of the maximum number of cells that c...

One of the research challenges in cellular networks is the design of an efficient model that can reduce call blocking probability and improve the quality of service (QoS) provided to mobile users. Blocking occurs when a new call cannot be admitted into the network due to channel unavailability caused by limited capacity or when an ongoing call cannot be continued as it moves from one base stati...

In this paper, we consider the optimal converter placement problem for a given number of converters on a path topology in all-optical WDM networks. The placement of converters on a path divides the path into segments. A segment is deened as a set of links between two consecutive converters on a path. We rst introduce and prove that optimal placement considering end-to-end performance is obtaine...

To enhance the utilization of the traffic channels of a network (instead of allocating radio channel to an individual user), a channel or a group of channels are allocated to a user group. The idea behind this is the statistical distribution of traffic arrival rates and the service time for an individual user or a group of users. In this paper, we derive the blocking probability and throughput ...

Recent development in optical networking employing wavelength-division-multiplexing (WDM) fulfills the high bandwidth demand applications. Failure of such networks, leads to enormous data and revenue loss. Design a low cost survivable WDM network is always an interesting and difficult process. In this paper we present link-path model for capacity allocation and calculate blocking probability in...

A traffic model for GSM/GPRS, the hybrid radio resource allocation (HRRA) algorithm is evaluated. A dedicated number of GPRS channels plus idle periods between voice calls are used for GPRS data packet transfers. A simulator was developed in order to evaluate the HRRA algorithm, which provides a reasonable forecast on the voice blocking probability and on packet delay for a single cell system. ...

A multi-level dynamic guard channels (MLDGC) scheme to efficiently provide priority access for handoff calls over new calls in cellular systems is proposed. The switch between levels is controlled by the number of dropped calls. Each additional level has an increasing number of guard channels as triggered by the number of dropped calls. An analytical formulation of the steady state probabilitie...

Consider two markets and two operators having different networks operators. Both operators are in competition for capturing more and more the internet traffic. The users have presumptive behaviour like faithful, impatient and completely impatient. This paper presented Markov chain model based analysis of user behaviour for selecting any one operator. It is found that blocking probability of net...

In this paper we analyze a cellular communication environment which offers specific users priority access to network resources. We foresee a finite number of widespread disparate mobiles moving in a geographical region covered by a finite set of cells. Each user belongs to a class characterized by a specific service, load and mobility profile. In this paper we will consider two classes, namely ...