A novel approach to emergency management of wireless telecommunication system

The survivability concerns the service continuity when the components of a system are damaged. This concept is especially useful in the emergency management of the system, as often emergencies involve accidents or incident disasters which more or less damage the system. The overall objective of this thesis study is to develop a quantitative management approach to the emergency management of a wireless cellular telecommunication system in light of its service continuity in emergency situations – namely the survivability of the system. A particular wireless cellular telecommunication system, WCDMA, is taken as an example to ground this research.The thesis proposes an ontology-based paradigm for service management such that the management system contains three models: (1) the work domain model, (2) the dynamic model, and (3) the reconfiguration model. A powerful work domain modeling tool called Function-Behavior-Structure (FBS) is employed for developing the work domain model of the WCDMA system. Petri-Net theory, as well as its formalization, is applied to develop the dynamic model of the WCDMA system. A concept in engineering design called the general and specific function concept is applied to develop a new approach to system reconfiguration for the high survivability of the system. These models are implemented along with a user-interface which can be used by emergency management personnel. A demonstration of the effectiveness of this study approach is included.There are a couple of contributions with this thesis study. First, the proposed approach can be added to contemporary telecommunication management systems. Second, the Petri Net model of the WCDMA system is more comprehensive than any dynamic model of the telecommunication systems in literature. Furthermore, this model can be extended to any other telecommunication system. Third, the proposed system reconfiguration approach, based on the general and specific function concept, offers a unique way for the survivability of any service provider system.In conclusion, the ontology-based paradigm for a service system management provides a total solution to service continuity as well as its emergency management. This paradigm makes the complex mathematical modeling of the system transparent to the manager or managerial personnel and provides a feasible scenario of the human-in-the-loop management

Techniques of distributed caching and terminal tracking for mobile computing.

by Chiu-Fai Fong.Thesis (M.Phil.)--Chinese University of Hong Kong, 1997.Includes bibliographical references (leaves 76-81).Abstract --- p.iAcknowledgments --- p.iiiChapter 1 --- Introduction --- p.1Chapter 1.1 --- Distributed Data Caching --- p.2Chapter 1.2 --- Mobile Terminal Tracking --- p.5Chapter 1.3 --- Thesis Overview --- p.10Chapter 2 --- Personal Communication Network --- p.11Chapter 2.1 --- Network Architecture --- p.11Chapter 2.2 --- Resource Limitations --- p.13Chapter 2.3 --- Mobility --- p.14Chapter 3 --- Distributed Data Caching --- p.17Chapter 3.1 --- System Model --- p.18Chapter 3.1.1 --- The Wireless Network Environment --- p.18Chapter 3.1.2 --- Caching Protocol --- p.19Chapter 3.2 --- Caching at Mobile Computers --- p.22Chapter 3.3 --- Broadcasting at the Server --- p.24Chapter 3.3.1 --- Passive Strategy --- p.27Chapter 3.3.2 --- Active Strategy --- p.27Chapter 3.4 --- Performance Analysis --- p.29Chapter 3.4.1 --- Bandwidth Requirements --- p.29Chapter 3.4.2 --- Lower Bound on the Optimal Bandwidth Consumption --- p.30Chapter 3.4.3 --- The Read Response Time --- p.32Chapter 3.5 --- Experiments --- p.35Chapter 3.6 --- Mobility Concerns --- p.42Chapter 4 --- Mobile Terminal Tracking --- p.44Chapter 4.1 --- Movement Model --- p.45Chapter 4.2 --- Optimal Paging --- p.48Chapter 4.3 --- Transient Analysis --- p.52Chapter 4.3.1 --- The Time-Based Protocol --- p.55Chapter 4.3.2 --- Distance-Based Protocol --- p.59Chapter 4.4 --- The Reverse-Guessing Protocol --- p.64Chapter 4.5 --- Experiments --- p.66Chapter 5 --- Conclusions & Future Work --- p.71Chapter 5.1 --- Distributed Data Caching --- p.72Chapter 5.2 --- Mobile Terminal Tracking --- p.73Bibliography --- p.76A Proof of NP-hardness of the Broadcast Set Assignment Problem --- p.8

Location Management Techniques in Cellular Network: a Novel Approach

Communication had become the necessity of our lives. It is no longer just a way to communicate with each other. It is now a part of our life. Most of this changes are the result of the rapid growth in mobile industry. The number of subscribers are increasing in an exponential manner. At current stage the number of mobile devices had already crossed the total human population of our planet. But this high paced increase in number of subscribers had brought in some new and challenging problems into the eld also. Particularly the problem of ccommodating this huge number of subscribers into the limited amount of spectrum, withoutcompromising the Grade of Service. In this thesis we had tried to address this issue by reducing the spectrum utilization in the location management. Location management are the set of techniques that are used by the telecom provider to determine the current location of the user (location update) and to inform the user regarding an incoming call (paging). Both of this process consumes a huge portion of the available spectrum. This thesis presents a dynamic pro le based location management technique that optimizes both these technology. When simulated using actual user data, the algorithm shows it is 3 times more ecient than the conventional paging and 2 times more ecient compared to other intelligent paging algorithms. Similarly in case of location update, the algorithm shows an improvement of 17% compared to the conventional technique. The thesis also includes a comparison between sequential paging and concurrent paging based on parameters like probability of channel being busy,average waiting time per user etc.The novelty of this work is that it uses CDR (Call Data Record) to pro le the users. And the algorithm is implemented on actual user data rather than any theoretically predicted data. The optimization is done at individual user level. So the optimization achieved through the proposed algorithm is greater compared to other algorithms. The final output shows promising result specically in terms of bandwidth conservatio

Locating Objects in a Wide-area System

Steen, M.R. van [Promotor]Tanenbaum, A.S. [Promotor

Location Management Techniques in Cellular Network: a Novel Approach

Communication had become the necessity of our lives. It is no longer just a way to communicate with each other. It is now a part of our life. Most of this changes are the result of the rapid growth in mobile industry. The number of subscribers are increasing in an exponential manner. At current stage the number of mobile devices had already crossed the total human population of our planet. But this high paced increase in number of subscribers had brought in some new and challenging problems into the eld also. Particularly the problem of ccommodating this huge number of subscribers into the limited amount of spectrum, withoutcompromising the Grade of Service. In this thesis we had tried to address this issue by reducing the spectrum utilization in the location management. Location management are the set of techniques that are used by the telecom provider to determine the current location of the user (location update) and to inform the user regarding an incoming call (paging). Both of this process consumes a huge portion of the available spectrum. This thesis presents a dynamic pro le based location management technique that optimizes both these technology. When simulated using actual user data, the algorithm shows it is 3 times more ecient than the conventional paging and 2 times more ecient compared to other intelligent paging algorithms. Similarly in case of location update, the algorithm shows an improvement of 17% compared to the conventional technique. The thesis also includes a comparison between sequential paging and concurrent paging based on parameters like probability of channel being busy,average waiting time per user etc.The novelty of this work is that it uses CDR (Call Data Record) to pro le the users. And the algorithm is implemented on actual user data rather than any theoretically predicted data. The optimization is done at individual user level. So the optimization achieved through the proposed algorithm is greater compared to other algorithms. The final output shows promising result specically in terms of bandwidth conservatio

Cooperating broadcast and cellular conditional access system for digital television

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.The lack of interoperability between Pay‐TV service providers and a horizontally integrated business transaction model have compromised the competition in the Pay‐TV market. In addition, the lack of interactivity with customers has resulted in high churn rate and improper security measures have contributed into considerable business loss. These issues are the main cause of high operational costs and subscription fees in the Pay‐TV systems. This paper presents a novel end‐to‐end system architecture for Pay‐TV systems cooperating mobile and broadcasting technologies. It provides a cost‐effective, scalable, dynamic and secure access control mechanism supporting converged services and new business opportunities in Pay‐TV systems. It enhances interactivity, security and potentially reduces customer attrition and operational cost. In this platform, service providers can effectively interact with their customers, personalise their services and adopt appropriate security measures. It breaks up the rigid relationship between a viewer and set‐top box as imposed by traditional conditional access systems, thus, a viewer can fully enjoy his entitlements via an arbitrary set‐top box. Having thoroughly considered state‐of‐the‐art technologies currently being used across the world, the thesis highlights novel use cases and presents the full design and implementation aspects of the system. The design section is enriched by providing possible security structures supported thereby. A business collaboration structure is proposed, followed by a reference model for implementing the system. Finally, the security architectures are analysed to propose the best architecture on the basis of security, complexity and set‐top box production cost criteria

Proceedings of the Third International Mobile Satellite Conference (IMSC 1993)

Satellite-based mobile communications systems provide voice and data communications to users over a vast geographic area. The users may communicate via mobile or hand-held terminals, which may also provide access to terrestrial cellular communications services. While the first and second International Mobile Satellite Conferences (IMSC) mostly concentrated on technical advances, this Third IMSC also focuses on the increasing worldwide commercial activities in Mobile Satellite Services. Because of the large service areas provided by such systems, it is important to consider political and regulatory issues in addition to technical and user requirements issues. Topics covered include: the direct broadcast of audio programming from satellites; spacecraft technology; regulatory and policy considerations; advanced system concepts and analysis; propagation; and user requirements and applications