**Part 5**

 **Traffic Engineering** 

274 Telecommunications Networks – Current Status and Future Trends

Multicriteria optimization issues and methods based on Pareto conclusions are introduced for the long-term and short-term practical planning, designing and controlling within different types of telecommunication networks. In the process of solving the optimization problems we consider the set of network quality indicators as the different network topologies, transmission capacities of communication channels, various disciplines of

Peculiarities of the long-term multicriteria optimization methods used for solving problems of the cellular networks planning are considered. As an example, the Pareto-optimization

Practical features of the multicriteria approach in solving the optimal routing problem in the multi-service networks are considered within organizing multipath routing as well as speech codec choice based on a set of the quality indicators. The model of the information resources balancing on a basis of the decentralized operating agents system with a multicriteria account of chosen quality indicators is also offered. Considered adaptive balancing traffic algorithm improves the basic characteristics of the telecommunication

The research described in this work was made possible in part by the scientific direction "Telecommunication and information networks optimization", headed by prof. Bezruk V., of the Communication Network Department within Kharkov National University of Radio

Bezruk, V. & Skorik, Y. (2010). Optimization of speech codec on set of indicators of quality.

Bezruk, V. & Bukhanko, O. (2010). Control mode of network resources in multiservice

Figueira, J. (Ed(s).). (2005). *Multiple Criteria Decision Analysis: State of the Art Surveys*, Springer Science + Business Media, Inc, ISBN 978-0-387-23081-8, Boston, USA Saaty, P. (2005). *Theory and Applications of the Analytic Network Process: Decision Making with* 

Taha, H. (1997). *Operations Research: An Introduction*, Prentice Hall Inc., ISBN 0-13-272915-6,

966-335-329-6, Sevastopol, Crimea, Ukraine, September 13 – 17, 2010 Bezruk, V. & Varich, V. (2011). The multicriteria routing problem in multiservice networks

*Proceedings of TCSET'2010 Modern problems of radio engineering, telecommunications and computer science,* p. 212, ISBN 978-966-553-875-2, Lviv – Slavske, Ukraine,

telecommunication systems on basis of distributed system of agents. *Proceedings of CriMiCo'2010 Microwave and Telecommunication Technology*, pp. 526-527, ISBN 978-

with use composition quality indicators. *Proceedings of CriMiCo'2011 Microwave and Telecommunication Technology,* pp. 519 – 520, ISBN 978-966-335-254-8, Sevastopol,

*Benefits, Opportunities, Costs and Risks,* RWS Publications, ISBN 1-888603-06-2,

solution within planning of the cellular communication networks is also presented.

network in a process of the short-term controlling for chosen cases of topologies.

service requests applied to different routing ways, etc.

**5. Acknowledgment** 

Electronics, Ukraine.

February 23 – 27, 2010

Pittsburgh, USA

New Jersey, USA

Crimea, Ukraine, September 12 – 16, 2011

**6. References** 

**12** 

*Portugal* 

**Optical Burst-Switched Networks** 

**Exploiting Traffic Engineering** 

*2Instituto de Telecomunicações, Instituto Superior Técnico* 

In order to simplify the design and operation of telecommunications networks, it is common to describe them in a layered structure constituted by a service network layer on top of a transport network layer. The service network layer provides services to its users, whereas the transport network layer comprises the infrastructure required to support the service networks. Hence, transport networks should be designed to be as independent as possible from the services supported, while providing functions such as transmission, multiplexing, routing, capacity provisioning, protection, and management. Typically, a transport network includes multiple network domains, such as access, aggregation, metropolitan and core, ordered by decreasing proximity to the end-users, increasing geographical coverage, and

Metropolitan and, particularly, core transport networks have to transfer large amounts of information over long distances, consequently demanding high capacity and reliable transport technologies. Multiplexing of lower data rate signals into higher data rate signals appropriate for transmission is one of the important tasks of transport networks. Time Division Multiplexing (TDM) is widely utilized in these networks and is the fundamental building block of the Synchronous Digital Hierarchy (SDH) / Synchronous Optical Network (SONET) technologies. The success of SDH/SONET is mostly due to the utilization of a common time reference, improving the cost-effectiveness of adding/extracting lower order signals from the multiplexed signal, the augmented reliability and interoperability, and the standardization of optical interfaces. SDH/SONET networks also generalized the use of optical fibre as the transmission medium of metropolitan and core networks. Essentially, when compared to twisted copper pair and coaxial cable, optical fibre benefits from a much larger bandwidth and lower attenuation, as well as being almost immune to electromagnetic interferences. These features are key to transmit information at larger bit rates over longer

Despite the proved merits of SDH/SONET systems, augmenting the capacity of transport networks via increasing their data rates is only cost-effective up to a certain extent, whereas

**1. Introduction** 

growing level of traffic aggregation.

distances without signal regeneration.

**in the Wavelength Domain** 

João Pedro1,2 and João Pires2 *1Nokia Siemens Networks Portugal S.A.* 
