Transmission Network Quality Evaluation Model And Optimization Method

As the supporting part of the whole communication network, transmission network is directly related to the QoS of all types of business network. The quality of transmission network becomes the focus of attention and research hotspot of communication network operation. In the large-scale, wide distribution and complex transmission network, it is the critical issue to evaluate quality scientifically and comprehensively, find the key influence factors and take effective measures to optimize and improve transmission network quality.A lot of researches have been done in the areas of network quality evaluation and optimization of transmission network. Due to the lack of in-depth analysis of the network structure of the transmission network, transmission network quality evaluation is focused on partial aspects of network, which is not comprehensive enough to consider the factors that affect the network quality, and also lack adequate consideration of the whole network structure of the transmission network and the bearer services on it. So these evaluation methods are incomprehensive. The main concern of network optimization is network design, using theoretical analysis to optimize the network structure. Because of the absence of an effective quality evaluation model, network optimization is lack of basis, and has no effective method to verify its validity.In response to these problems, this paper researches the quality assessment models and optimization methods for transmission network, and use some examples to verify the proposed model and algorithm. The main research contents and innovations of the paper are as follows:(1) This paper analyzed the elements which affect the running quality of transmission network, including fault, circuit service quality, cutover, performance, and gave the measurement of each elements. Based on these, we proposed the running quality evaluation model, which can fully reflect the quality of transmission network running;(2) Based on in-depth analysis and research of transmission network, the paper proposed that the network configuration affected the QoS greatly, analyzed the main influence factors such as the quality of the topology, the quality of the transmission system, the quality of the transmission circuit, the utilization of resource, and so on. Then analyzed their measuring method and proposed the evaluation model of configuration quality. Combined operating quality evaluation model and configuration quality evaluation model, the paper presented an overall model can evaluate network quality of the transmission network comprehensively and accurately, and then by using a complete instance, the validity of this model is verified;(3) Based on the quality Evaluation model of the transmission network, this paper analyzed necessity, principles and direction of the transmission network, then proposed network optimization network-oriented macro optimization method and circuit-oriented micro optimization method;(4) The transmission circuit routing algorithm is directly related to the network quality of the transmission network. The paper introduced the ant colony algorithm to realize circuit routing selection, described ant colony system model and the transmission network circuit routing selection principles, improving the lack of traditional ant colony system to solve the multi-constrained routing problem. By using the improved ant colony system, we describing the process of multi-constraint circuit routing selection algorithm, and using examples to verify this algorithm;(5) The important circuit routing protection is a key business need to focus on, and it also is an important way to improve the network quality of the transmission network. Based on the description of the protection circuit routing principle, the paper pointed out that universal routing algorithm cannot achieve the selection of protection routing, and presented using multi ant colony algorithm to achieve it. For two different circumstances:selecting protection routing of existing circuit and selecting the primary and protection circuit at the same time, we described circuit protection routing algorithms separately, and validated it by examples.