Impact of Queuing on Call Completion Rate in GSM Networks

Effective utilization of network resource reduces the probability that a call arriving at the base station (BS) of a network will be lost. Performance evaluation plays an important role in modelling and designing of effective schemes to utilize limited network resource. This objective is achieved by an accurate traffic characterization and a precise analysis of the performance metrics in terms of traffic intensity. This has prompted the deployment of various concepts and techniques aimed at delivering solutions on the issue of optimization of GSM networks. In this paper, we use the queuing approach to develop a model for call completion, making signal power considerations as well. A General User Interface (GUI) is designed for the developed model using MATLAB and the impact of queuing on call completion is analysed by carrying out an assessment of the performance of the model at different parametric values.http://dx.doi.org/10.4314/njt.v34i1.2

Handoff Counting in Hierarchical Cellular System With Overflow Scheme

InmobiT computi: scenarik the number of hando# (called as hando# counting)i s veryirypkxfik for thesi#TxI)p: networkdesir and tra#c loadanalysi( Inthi paper, we study the hando#countik characterip:k( i terms of probabip:k massfunctix (pmf) and statij(p:) momentsi thehi)x--(jp:)fi cellular systemapplyik overflow scheme under the general cellresi()## tii and general callholdi# tid dii##Ikp:)x The analytip: result and thealgorijI for the evaluati) of hando#counti( are,respectip:)j presented for the cases whether or not theLaplace--Stij#--pi Transform of callholdi( tid exii( Thenumeri)fi results reveal that as the callholdi-- tid i heavy-tai:)-- the hando#countij follows theheavy-tai)T tendency. Inaddi(--Ip the hando#countik pmf as well as the average value shows a si)Tp:)## di)Tp:) patternwit theuti(T(#p:) ofdi)--xIk callholdi( tid dii(xxIp:)# # 2004ElseviI B.V. Allrip(# reserved

Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks.

Over recent years, wireless communication systems have been experiencing a dramatic and continuous growth in the number of subscribers, thus placing extra demands on system capacity. At the same time, keeping Quality of Service (QoS) at an acceptable level is a critical concern and a challenge to the wireless network designer. In this sense, performance analysis must be the first step in designing or improving a network. Thus, powerful mathematical tools for analysing most of the performance metrics in the network are required. A good modelling and analysis of the wireless cellular networks will lead to a high level of QoS. In this thesis, different analytical models of various handoff schemes and resource re-allocation in homogeneous and heterogeneous wireless cellular networks are developed and investigated. The sustained increase in users and the request for advanced services are some of the key motivations for considering the designing of Hierarchical Cellular Networks (HCN). In this type of system, calls can be blocked in a microcell flow over to an overlay macrocell. Microcells in the HCN can be replaced by WLANs as this can provide high bandwidth and its users have limited mobility features. Efficient sharing of resources between wireless cellular networks and WLANs will improve the capacity as well as QoS metrics. This thesis first presents an analytical model for priority handoff mechanisms, where new calls and handoff calls are captured by two different traffic arrival processes, respectively. Using this analytical model, the optimised number of channels assigned to II handover calls, with the aim of minimising the drop probability under given network scenarios, has been investigated. Also, an analytical model of a network containing two cells has been developed to measure the different performance parameters for each of the cells in the network, as well as altogether as one network system. Secondly, a new solution is proposed to manage the bandwidth and re-allocate it in a proper way to maintain the QoS for all types of calls. Thirdly, performance models for microcells and macrocells in hierarchical cellular networks have been developed by using a combination of different handoff schemes. Finally, the microcell in HCN is replaced by WLANs and a prioritised vertical handoff scheme in an integrated UMTS/WLAN network has been developed. Simulation experiments have been conducted to validate the accuracy of these analytical models. The models have then been used to investigate the performance of the networks under different scenarios