Volume 7, Issue 3, March 2016

Innovative Technique for a Rational Location of Antennas on a Shared Tower in a Multi-Operator Environment

Marvin A. Osei, Amevi Acakpovi, Koudjo M. Koumadi, and Frank B. Anokye

Department of Electrical/Electronics Engineering, School of Engineering, Sunyani Polytechnic, Sunyani, Ghana
Department of Electrical/Electronics Engineering, School of Engineering, Accra Polytechnic, Accra, Ghana
Power Communication Group, Korea Electric Power Corporation (KEPCO) Research Institute, Naju, South Jeolla, South Korea
Department of Telecommunications, Ghana Technology University College, Accra, Ghana

Abstract - Tower sharing provides benefits to both operators and regulators in terms of cost saving and relative ease of deployment. Notwithstanding these benefits, tower sharing or colocation can result in some technical challenges such as non-availability of optimal height. This work proposes an algorithm to find the optimal height based on outage probability and go further to predict other possible positions on the tower with comparable performance for effective tower sharing based on a required isolation distance and spectral efficiency. Mathematical modelling and computer simulations are used in this paper. The results showed that different number of locations which are close to the global optimal height, provide comparable performance. Four different scenarios based on 3 and 7 clustering and 120o and zero sectorization of antennas are used in the testing of the algorithm with the MATLAB simulation environment. It was observed that different scenarios caused the optimal height to vary and hence put a limitation on the possible number of locations with comparable performance for colocation. The findings of this article can motivate more tower sharing in the telecommunication sector.

Index Terms - Tower Sharing, Antenna Co-Location, Optimal Height, Outage and Spectral Efficiency

Toward Structured Method for Business Process Re-engineering

Pages: 10-17 (8) | [Full Text] PDF (531K)

Salah Mohamed Ali Hassan and Abdelgaffar Hamid Ahmed

College of Computer Science and Information Technology, Department of Computer Science and Information Technology, Sudan University of Science and Technology, Khartoum, Sudan

Abstract - Improving business processes in organizations such as purchasing process by adding some quality (i.e. speed) is an ultimate goal of re-engineering methods. The central activity in this process is modelling business processes using formal language such as Design and Engineering Methodology of Organizations(DEMO).DEMO has two qualities: it considers the organizations from ontological level that abstracted from any kind of implementation and follows the white box approach. Because generally this research area is not mature, this paper examines the knowledge gap in DEMO for the purpose of supporting a structured method. This paper adds two values to DEMO, a package concept and business process variability from a well-established domain in software engineering. Both provide a structure approach for studding and detecting the waste in business processes. A real case study is taken to evaluate these concepts. Because Meta-Object Facility (MOF) is a standard and widely recognized language for supporting engineering tools, a DEMO MOF metamodel is developed and extended to add these concepts to contribute to business process re-engineering domain.

Index Terms - Business Process, DEMO, Concepts and Re-engineering Domain

A Cross-Layer based Mobility Aware Transmission Optimization Technique for Wireless Mesh Network

Pages: 18-25 (8) | [Full Text] PDF (607K)

Chaya Devi R., and T. G. Basavaraju

Department of CSE, Govt. SKSJTI, Bangalore, India
Computer Science and Engineering Department, Govt. SKSTI, Bangalore, India

Abstract - Due to rapid growth of the wireless based application services is increasing the demand for wireless communication techniques that use bandwidth more efficiently. WMNs have been adopted as back haul to connect various networks such as Wi-Fi, WiMax etc to the Internet. Wireless mesh networks are multihop networks, self organized networks which can provide last mile connectivity, high transfer speed, and cover large area with low deployment cost. The existing systems proposed so far suffer in utilizing the channel efficiently and induce high collision due to mobility. To address this in this work, the author propose the cross layer based mobility aware transmission optimization technique by designing a routing strategy which considers the link quality parameters from various layers and use some of these parameters to reduce packet loss and throughput and to improve the QoS parameters of the network. The experimental result obtained shows that the proposed approach improves the throughput efficiency considering mobility to existing approaches.

Index Terms - Wireless Network, TDMA, Network Layer, Radio Channel Measurement and Scheduling

Suggesting the Possible Solution of the Most Probable Security Attacks of MANETs

Pages: 26-29 (4) | [Full Text] PDF (235K)

Anum Aftab, Junaid Arshad and Muhammad Fuzail

Department of Computer Science and Engineering, UET-Lahore, Pakistan

Abstract - The MANETs security is vital challenge due to its unmonitored deployment nature and its inherent resources limitation. Mobile Ad hoc Network is used in very sensitive fields such as rescue operations, home and enterprise network, education military and airports. Therefore the addressing of security issues of network is most challenging task. Because of restricted possessions of mobile stations, the MANET security is more difficult to implement as compared to other traditional networks. Today huge research is going on in the field of security. Various techniques are now deployed to resolve the security issues. This paper provides possible solution of attacks of security in this evolving arena such as active and passive attacks. This paper also presents an inclusive survey of possible solutions available at a single platform. Suggested solution provide strong wall against problems and enhances the efficiency of security.

Index Terms - Security, MANET, Survey, Attacks and Solution

SHWMP: Scalable Hybrid Wireless Mesh Protocol for Wireless Mesh Networks

Pages: 30-37 (8) | [Full Text] PDF (371K)

H. R. Ranganatha and T. G. Basavaraju

Jain University, Bangalore-560 027, India
Department of Computer Science and Engineering, Government SKSJ Technological Institute, Bangalore-560 001, India

Abstract - Wireless Mesh Networks (WMN) is new concept of wireless networks which are interconnected without any wires and with full-fledged safety and dependable of a wired network. WMN brings the ease of simple installation and less expensive deployment costs. The standards which are met in Wireless Local Area Networks (WLAN) such as scalability, reliability and security has to be retained and maintained here. There are several issues exists with throughput, quality and security in a wireless mesh network and have largely been resolved. But scalable capacity issues remain as it and posses challenges for researchers to carry out work without compromising performance, Quality of Service (QoS) or availability across multiple hops in a mesh infrastructure. The increase in interest on wireless mesh architectures IEEE standard 802.11s has created lot of support for predominant mesh routing protocols. In this paper, we propose a scalable hybrid routing protocol for large scale Wireless Mesh Networks named as Scalable Hybrid Wireless Mesh Protocol (SHWMP). Specifically, performance analysis was simulated for Ad-hoc on Demand Distance Vector (AODV), Optimized Link State Routing (OLSR), Hybrid Wireless Mesh Protocol (HWMP) and Scalable Hybrid Wireless Mesh Protocol (SHWMP). The impacts of traffic loads, number of sources and the network size on wireless mesh network have been investigated through the simulation. SHWMP has a clear advantage compare to AODV, OLSR, HWMP in terms of maximizing throughput and minimizing end to end delay.

Index Terms - Hybrid Wireless Mesh Protocol, Routing, Scalability and Throughput

A Survey of Agile Software Estimation Methods

Pages: 38-42 (5) | [Full Text] PDF (208K)

Hala Hamad Osman and Mohamed Elhafiz Musa

International University of Africa, Faculty of Computer Studies
Sudan University of Science & Technology (SUST), Faculty of Computer Science, Khartoum, Sudan

Abstract - Software measurement which mainly includes software cost and effort estimation is one of the most important activities in the software development process and it is still a critical and long standing issue, especially in agile software. There are few agile estimation methods and techniques proposed in the last 10 years such as story point (the main metric used in agile), planning poker and expert opinion. Many researches estimated cost, size and duration (CSD) for agile project by using traditional methods such as: COCOMO II, COSMIC, Function Point, etc with a little modification. Other researches an attempt to combine traditional estimation methods and agile estimation method such as Story point and FP. The main contribution of this paper is a general overview about agile software cost/size estimation methods that can show us the evolution in this field and covers most of the famous available and practiced parametric models founded on the literature. Also, this paper includes comments and discussion on the performance about the estimation models and description of several newer approaches for agile software cost estimation.

Index Terms - Agile Software Estimation Method, User Story, Story Point, Planning Poker and Software Traditional Estimation Models

Volume 7, Issue 3, March 2016

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