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Telecommunications Markets (telecommunication + market)

Distribution by Scientific Domains

Business, Economics, Finance and Accounting	71%

Selected Abstracts

Optimization of Network Topologies for Service Providers in the Telecommunications Market

INTERNATIONAL TRANSACTIONS IN OPERATIONAL RESEARCH, Issue 6 2001
Dieter B. Pressmar
Following the deregulation of communications services, a growing number of commercial providers are offering global voice and data communications services via rented infrastructures. These service providers are faced with the challenge to determine cost-effective network-topologies, considering both the variety of contractual arrangements with national and international network providers, and the communication profiles of their customers. This paper introduces a planning model for solving the optimization problem outlined above. The model is evaluated on the basis of mixed-integer optimization. Practical deployment of this approach is discussed with respect to the run-time characteristics of the MIP solvers. Subsequently, a genetic algorithm is applied to the model and the results are compared to those of the mixed-integer optimization. [source]

Security and delay issues in SIP systems

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 8 2009
Christian Callegari
Abstract The deployment of multimedia over IP (MoIP), and in particular voice over IP services, requires to solve new security issues they introduce, before completely exploiting the great opportunities they offer to telecommunication market. Furthermore, the implementation of various security measures can cause a marked deterioration in quality of service, which is fundamental to the operation of an MoIP network that meets users' quality expectations. In particular, because of the time-critical nature of MoIP and its low tolerance for disruption and packet loss, many security measures implemented in traditional data networks are simply not applicable in their current form. This paper presents an analysis of the security options of Session Initiation Protocol- (SIP)-based MoIP architecture aimed at evaluating their impact on delay. In particular, each security option is analyzed in terms of clock cycles needed to perform the related operations. This parameter could be used to estimate the delay introduced by the security mechanisms. Moreover the paper proposes a rigorous definition of five security profiles, which provide different levels of security to a MoIP system. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Modelling the development of supply-restricted telecommunications markets

JOURNAL OF FORECASTING, Issue 4 2001
Towhidul Islam
Abstract A large proportion of the world telecommunications market can be characterized as supply restricted. In ITU (1999) official waiting lists numbered about 50 million worldwide with an average waiting time of two years. More than 100 countries had not eliminated the waiting list for telephone connections and hence a supply restricted market prevailed in all of these countries. Only about 25 countries have succeeded in eradicating their waiting list for basic telephone service. In terms of the pattern of diffusion, the subscriber's flow from waiting applicants to adopters is controlled by supply restrictions adding an important dimension that needs to be addressed when modeling and forecasting demand. An empirical analysis of the diffusion of main telephones in 46 supply-restricted countries is presented to demonstrate the usefulness of a three-stage Bass model that has been proposed to capture the dynamics of supply restrictions. We also compare the forecasting ability of different approaches to estimation when panel data are available. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Capital quality improvement and the sources of economic growth in the euro area

ECONOMIC POLICY, Issue 42 2005
Plutarchos Sakellaris
SUMMARY Capital quality improvement and Euroland growth Sources of growth Europe's growth slowed in the 1990s, reinforcing the overall impression of a need to catch up with the US regarding standards of living. In reaction, EU leaders adopted the famous Lisbon Agenda in 2000. The Agenda is now under review, the aim being to determine why progress on its pro-growth goals has been unsatisfactory and what can be done about it. The first crucial step in this process is to understand the true sources of the European growth slowdown. Sources-of-growth calculations have always been imprecise, but evidence from the US suggests that ,quality upgrading', especially in capital goods , has substantially worsened the precision problem since the 1990s. Unfortunately, quality adjusted sources-of-growth calculations, however, have not performed satisfactorily for Europe, so Europe's leaders are working with potentially misleading accounts of Europe's growth slowdown. Redressing this omission is the goal of this paper. Failure to account properly for capital quality improvements leads to two mistakes. First, overall GDP is underestimated. Our calculations, for example, show that euro area GDP growth was underestimated on average by 0.7 percentage points annually in the late 1990s. However, similar quality-adjustment figures raise US growth figures in the same period by even more, so quality-adjusting suggests that the US,EU growth gap was even more pronounced than previously believed. Secondly, the sources-of-growth calculations used to prioritize Europe's pro-growth policies are skewed. Our calculations show that the contribution of the slowdown in disembodied technical progress to the overall slowdown is more pronounced after quality adjustment. Our findings point to the need for adoption of microeconomic measures aimed at enhancing overall efficiency and boosting innovation activity. Such measures would aim at a better business environment, e.g. by easing regulatory and administrative burden and liberalizing energy and telecommunications markets. , Plutarchos Sakellaris and Focco Vijselaar [source]

Modelling the development of supply-restricted telecommunications markets

Privatisierung/Deregulierung/Marktverfassung: Die Sicht der Regulierungsbehörde

PERSPEKTIVEN DER WIRTSCHAFTSPOLITIK, Issue 3 2003
Matthias Kurth
This is an opportunity to recall the legislative rationale of liberalization and the regulatory instruments chosen, and to assess how the markets have developed. Aware that telecommunications were not one of the state's core tasks and that there were obvious advantages to services being provided by private companies in a competitive environment, the lawmakers framed the conditions for competition in the provisions of the Telecommunications Act (TKG). In retrospect, these arrangements have largely proved their worth, even if the global economic crisis of the last two years has made itself felt in the telecommunications markets as well. Hence the forthcoming amendment should reflect the TKG's pro-competition philosophy and seek only to improve upon the regulatory instruments where they have been found wanting. [source]

Information and Values in Popular Protests: Costa Rica in 2000

BULLETIN OF LATIN AMERICAN RESEARCH, Issue 1 2009
EDUARDO FRAJMAN
The mass demonstrations in Costa Rica in 2000 opposing a government initiative to deregulate the electricity and telecommunications markets point to the importance of the paths of communication between the people and government leaders to understand mass political mobilisation. This article explains the surprising reaction of the Costa Rican public by focusing on the unwillingness or inability of the policy-makers to articulate their position in a way acceptable to the citizenry, leaving public space under the dominant influence of social organisations that opposed the initiative. [source]