Prediction of Faults in Cellular Networks Using Bayesian Network Model

Cellular network service providers compete with each other for the vast and dynamic market that is characterized by the ever-changing services on offer and technology. These services require very reliable net-works that can meet the customer service level of agreement (SLA). We are motivated by this to model the cellular network service faults and this paper reports on results of faults prediction modelling. Cellular networks are uncertain in their behaviours and therefore we use a Bayesian network to model them. We derive probabilistic models of the cellular network system in which the independence of relations between the variables of inter-est are represented explicitly. We use a directed graph in which two nodes are connected by an edge if one is a direct cause of the other. We present the simulation results of the study

An Optimum Vertical Handoff Decision Algorithm for UMTS-WLAN

The integration of diverse but complementary cellular and wireless technologies in the next generation of wireless communication systems requires the design of intelligent vertical handoff decision algorithms to enable mobile users to seamlessly switch network access and experience uninterrupted service continuity anywhere and anytime. This paper provides an adaptive multiple attribute vertical handoff decision algorithm that enables wireless access network selection at a mobile terminal using fuzzy logic concepts and a genetic algorithm. A performance study using the integration of wireless wide area networks (WWANs) and wireless metropolitan area networks (WMANs) as an example shows that our proposed vertical handoff decision algorithm is able to determine when a handoff is required, and selects the best access network that is optimized to network conditions, quality of service requirements, mobile terminal conditions, user preferences, and service cost

Software Engineering for Mapping Radio Frequency Pollution

Electromagnetic fields radiation has raised concerns within several segments of the population in the past three decades. Many studies proved inconclusive, in part due to the scarcity of data. We propose the idea of a geographical model based radiation pollution database. We discuss networked sensing technology for detection and monitoring of electromagnetic fields. We elaborate on software engineering issues for the visualization in real time of electromagnetic field mappings and the dissemination of information through various means and levels of access. We propose the database be complimented by a data algorithmic software solution for the extraction of patterns

Networking in Rural Environments: Benefits, Feasibilities and Requirements

Abstract—Building networks in rural areas is difficult because of the tough rural environments and low return to the service operators on investment. Rural networking and their applications in education, health, community development, and business development are essential to the daily life for both inhabitants and visitors. They further bring opportunities in job and business which play a key role in developing most underdeveloped rural areas. Moreover, rural communication will grow with the initial investment in rural networking. It will become the major communication market and generate large profits to service operators and equipment manufacturers. Wireless networking is generally considered a solution to these difficulties in rural conditions. Compared with the wireline construction, setting up wireless networks is faster, more flexible, and less expensive. In addition, many new and advanced wireless technologies have enabled universal communication to rural and remote areas in a profitable manner. Yet special technological requirements need to be met for wireless networking to become feasible in rural areas. Index Terms — Rural areas, communication system planning

Policy-based Danger Management in Artificial Immune System Inspired Secure Routing in Wireless Mesh Networks

This paper introduces Policy based Management Information Base to manage danger in Artificial Immune System inspired secure routing in Wireless Mesh Networks. WMN management functions are defined and the paper focuses only on the security function. Proposed policy based management and typical operation of the architecture are also reported

Analysis of the Topology for Moving Wireless Networks

This document presents an analysis of the factors that influence the network topology in a broadband mobile wireless as hoc networks moving on platforms. This paper focuses on studying the topology for networks where the nodes carrying the access points are constantly moving within urban areas. The influence of the number of nodes as well as the structure of the streets (type of mobility) on the network topology is also studied. To do that, this paper will first present methods to analyze the influence of the velocity of the nodes on the network topology. Second, the implications of number of nodes and type of mobility combination are also analyzed. When there are more nodes in a certain type of mobility area, it is expected that the topology of the network follow that structure shape

Vertical Handoff Decision Algorithms Using Fuzzy Logic

This paper reports on the design and implementation of multi-criteria vertical handoff decision algorithms in a heterogeneous wireless wide area network (WWAN) and a wireless local area network (WLAN) environment. An IP-centric Field Workforce Automation" project aims to ensure free movement of field workers between networks while always connected in an IP mode, and to allow a user to use one device across many types of networks. This requires the integration and interoperation of heterogeneous networks, and the provision of seamless vertical handoff. We use a fuzzy logic inference system to process a multi-criteria vertical handoff decision metrics.

A New Algorithm of Trust Formation in Wireless Sensor Networks

This paper introduces a new algorithm for calculating trust in Wireless Sensor Networks based on the quality of services characteristics expected to be fulfilled by nodes. Figure 3 shows the algorithm being proposed as a flowchart. The flowchart shows the three main sources for computing trust; the previous experience with the nodes, the recommendations from the surrounding nodes and the dispositional trust in nodes (the amount of risk the node is ready to take in the absence of the previous experience and/or the recommendations). Wireless Sensor Networks as an emerging technology has received a great attention from both, researchers and the industry due to the need of tiny and cheap nodes to be distributed in large scales and in difficult environments. The creation, operation, management and survival of Wireless Sensor Networks as a special type of ad hoc network is dependent upon the cooperative and trusting nature of its nodes

A New Address Allocation Scheme and Planning of Personal Area and Sensor Networks

This paper proposes a new addressing scheme for personal area and sensor networks with Zigbee. The method is based on arithmetic series and avoids address duplication and wastage. Problems associated with skip distance addressing and static addressing schemes are highlighted. Progressive addressing of nodes is demonstrated. The method permits identifying the Zigbee network using IPv6 addressing of a parent gateway and offset addressing of children nodes

Design Concepts Wireless Moving Networks

This paper reports on preliminary work on the design of an experimental ad hoc network to be deployed on moving platforms. We discuss and evaluate a moving wireless network consisting of a collection of wireless terminals operating as a moving wireless 'local' area network (m-WLAN) carried by a platform in motion. Each m-WLAN communicates wirelessly with a global fixed or wireless network through an anchor or master (M) node. The network travels at a speed v kmlhr as the master node maintains attachment to a global fixed network. The slave nodes and their master (M) node retain a wireless local area network structure in a mobile system scenario (truck, bus, train and airplane)