Κάθετη διαπομπή στο LTE, LTE Vertical Handover
Thesis in hand aims to present and analyze vertical handover signaling to LTE. In vertical handover we switch between heterogeneous wireless network access technologies, in this case it concerns WLAN and WiMAX. An extensive analysis is written for LTE, WiMAX and WLAN, their features, the architecture and the protocols they use. The handover process is analyzed, also the handover categories and all phases of handover procedure are presented. Two vertical handover procedures are examined, one is through the Evolved Packet Core (EPC) and the other is Media Independent Handover (MIH). The main objective is to present, and analyze the flow of messages that are exchanged at signaling level to achieve vertical handover between LTE-WLAN and LTE-WiMAX for both EPC an MIH handover techniques. Finally, proposals on future evolution are brought forward.