An analysis of the quality of customer service in the implemented projects of LTE networks in the world and 4G networks in Ukraine has established that the claimed requirements for fourth generation networks are not achieved in any of the implemented networks, and the actual quality of customer service (target efficiency) is at a rather low level which indicates the low efficiency of existing radio network planning methods, transport subsystems, control and cybersecurity management methods. This made it possible to determine the directions by which it is necessary to increase the efficiency of the operation of cellular networks.
In this dissertation were developed several methods to improve network efficiency. The method of planning of the network of the cellular operator enables cellular operators to more accurately assess the coverage of radio coverage areas, choose key indicators of service quality, more efficient frequency planning and capital cost calculation, which in turn allows us to assess the feasibility of constructing a cellular network option. On the basis of this advanced method, a training software (web-application) was developed to evaluate radio coverage zones of LTE network base stations. The method for evaluating key indicators of service quality, the level of information security and the efficiency of cellular networks makes it possible to assess the most important indicators of the quality of functioning and security of the cellular network network in order to continuously monitor and optimize them when introducing new services during customer service. The method for optimizing the subsystem of base stations allows to increase the radius of subscriber service areas of cellular networks, which allows minimizing the number of base stations for network construction, and therefore reduce the cost of the cellular operator to build the subsystem of the base stations, that is, increase the economic efficiency of the network. Improved method of the radio interface off-loading using a non-3GPP standard subnet allow to reduce the load on the radio interface of the network of the cellular network to an acceptable level, double the number of active subscribers, which are served in the cell, and provide load balancing and increase the efficiency of the radio subnetwork. The method of optimization of a multi-level transport segment of a cellular network has been developed, which allows to improve the structure of the transport network during the transition to new generations networks, providing the necessary capacity and increasing and improving the efficiency of the transport network. The method of routing with resource reservation and balancing of the traffic of a cellular operator with the consideration of information security requirements allows to increase the efficiency of the transport channels usage.
The method for evaluating the effectiveness of a software-configured network allows for a more flexible and operational expansion of the network, the introduction of new services, increasing the efficiency of data delivery for the hierarchical structure.
The method of network-centric monitoring and response to cyber incidents in the network of the cellular network allows real-time monitoring of the state of cyber security, its level and, consequently, the efficiency of the cellular network.
On the base of these methods in this dissertation was developed cellular networks efficiency improving methodology, which is using the improved method of LTE network planning, the key method for assessing performance of the cellular operator for the purpose of continuous operator network optimizing using the method of base station subsystem optimization, improved method of radio interface of the cellular operator offloading using Wi-Fi, the method of optimization of multi-vehicle segment of the cellular network, the method of routing with resource reservation and load balancing of mobile operator and method of SDN network effectiveness evaluation.
Using the developed methodology mobile operators can improve the efficiency of their networks by increasing the radius of the service areas, minimizing the required number of base stations for the construction of the network, doubling the number of active subscribers in the cell and provide load balancing in transport and radio network, increase transport network efficiency, enhance network reliability, optimize utilization of transport channels for a more flexible and rapid network expansion, introduction of new services and improved data delivery in the hierarchical structure of SDN. It is advisable to use the obtained scientific results when planning LTE and 5G wireless networks, developing equipment and software for data transmission systems, as well as in the learning process.
