**4. Conclusion**

272 Telecommunications Networks – Current Status and Future Trends

The considered mathematical model of the distributed network resources controlling uses specific criteria of optimality included standard routing protocol metrics, a measure of

of the load balancing under the routes with equal or non-equal metric. However, absence of the decentralized control behind the autonomous system of telecommunication network can finally result in an uncontrollable overload. That fact is defined by the presence of additional minimized indicators leading to the practical value of the proposed model. Thus a choice of the relation of weight coefficients q1 , q2 and q3 is an independent problem demanding some future investigations and formalizations. In this model this task was dared

The proposed imitation model included up to 18 agents (fig. 7). Researches for different

During practical investigation there were analyzed several models of multipath routing and

and 2 <sup>σ</sup> (K) absence, function (10) becomes the model

channels and agents loading in given telecommunication network.

variants of connectivity between agents have been carried out.

Obviously, under condition of 1 σ (K)

with expert's estimations.

Fig. 7. Used imitation model.

М1 – model of routing by RIP;

М4 – Gallagher stream model;

load balancing. These models are listed below:

М2 – model of multipath routing by an equal metric;

М3 – model of multipath routing by an non-equal metric (IGRP);

М5 – considered model with multicriteria account of two indicators (10); М6 – considered model with multicriteria account of three indicators (10). The present work deals with the methodology of generating and selecting the variants of information systems when they are optimized in terms of the set of quality indicators. The multicriteria system-optimization problems are solved in three stages. By using the morphological approach a structural set of permissible variants of a system is initially generated. This set is mapped into the space of vector estimates. In this space a subset of Pareto-optimal estimates is selected, defining the potential characteristics of the system on the basis of the set of quality indicators. At the conclusive stage the only variant is selected amongst the Pareto-optimal variants of the system provided there exists an extreme of a certain scalar functional whose form is determined with the use of some additional information obtained from a customer.

**Part 5** 

 **Traffic Engineering** 

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 service requests applied to different routing ways, etc.

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

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