Energy efficient video transmission using cooperation of LTE and WLAN

Long Term Evolution (LTE) networks are a new generation of networks to meet the increas- ing demand for multimedia services in wireless networks. Energy efficient data delivery is a key issue in LTE networks. In this thesis, a cooperative mechanism is proposed to decrease the energy consumption in the downlink channel of LTE networks for multicast. In this approach, users in the LTE cell are grouped into clusters based on their distance from the base station. Then, a cluster header is chosen for each group based on a utility function that evaluates user satisfaction after each transmission. Cluster headers receive data di- rectly from the base station and they are responsible to relay data to other users in their cluster using Wireless Local Area Network (WLAN). Simulations show that our approach reduces power consumption of the base station by 5% to 25% compared to conventional multicast transmission mechanism. The cooperative mechanism also helps mobile users to save energy on data receiving.