Planning and Analysis of Energy Efficient Multi-RAT Networks: The case of Addis Ababa City

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Addis Ababa University


Now a day’s wireless communication is one of the most active areas of technology development. It enables customers to use communication services like telephony or internet services at anytime and anywhere. A multitude of varying radio access technologies has been developed in which they differ in their radio coverage, spectral efficiency, cell capacity, and peak data rate. For a network operator different radio access technology may best be suited in different parts of the network in terms of the radio environment, the expected traffic pattern, and the anticipated services. But cooperating of multiple radio access technologies by combining into a common network to allow network convergence and resource management is the main concern for the operator. On the other hand, energy is a scarce resource and becoming a main concern due to the increasing demands on natural energy resources. Hence, implementation of energy efficient communication networks has become the main research concern currently. Therefore, avoiding of unnecessary energy consumptions by adopting sleep mode mechanisms is promising solution as BSs consume the highest proportion of energy expenditure in cellular networks. Sleep mode techniques aim to save energy by selectively turning off BSs during “off-peak” hours. This thesis deals with the procedure of how to carry out the Multi-RAT RNP for 2G, 3G, and 4G networks and reduce power consumption of the planned network without compromising the expected service. All the required steps and methods of RNP for Multi-RATs including GSM, UMTS & LTE like dimensioning, site selection for BS location, and radio resource management strategies has been addressed. The RNP focuses specially on the coverage, capacity dimensioning and frequency planning. Finally, minimizing of BSs energy consumption by switching off selective BSs based on daily network traffic load is addressed. Hence, the main aim of this thesis is planning of energy efficient Multi-RAT network for a dense urban area and Addis Ababa city is used as a case study. The planning considers that one site may have different access technologies with different configuration scenarios, depending on the subscribers and other parameters due to the reason of GSM network is excellent for coverage and mostly used for voice service, and UMTS & LTE have less coverage and mostly used for data.



GSM, UMTS, LTE, Coverage, Capacity, Energy Efficiency