Today, more and more users have come to depend on mobile devices, such as cellular phones. These mobile devices are powered by battery, which is fixed-power source. The limited power source for the battery-powered wireless devices is a huge obstacle for further development of more sophisticated devises, such as so called smart-phones, which is strongly demanded by consumers. Previous research has focused on increasing battery capacities. However, the slow development in battery capacities cannot catch up with the speed of evolution in Internet technologies and mobile devises. Instead, researchers recently started to work toward making every layer of network more energy efficient. Such an effort includes developing energy- efficient computer network architecture(s) or Green Network(s). Unfortunately, to date, they are effectively solutions targeted only for specific area of network architecture and have not been successfully applied for practical uses. Therefore, there is an urgent need to develop an effective energy-efficient mobile network solution for up-and-coming Forth Generation Wireless Network (4G).

The central theme of this study is that effectively designed optimization techniques in the computer network such as the Quality of Service (QoS) framework will improve overall system performance and achieve energy-efficient operation. Therefore, we will conduct this project based on developing model for simulation of energy efficient network design in Long Term Evolution (LTE). LTE is an up-and-coming 4G (a competitor of WiMAX), where energy-efficiency issue is open field and have to be addressed urgently. We will design a simulator specifically tailored for testing energy-efficient networks for LTE. The outcomes will enable us to apply QoS framework technologies to evaluate performance improvement in terms of energy-efficient operation.