Mobility Handoff Management During Active Session Using H.323 Protocol

Mobility Support Requiers an efficient Handoff mechanism to handle the new conditions that might occure during handoff .However, the mobile terminal will experience call disruption due to message losses if the cells do not overlap closely enough to complete a handoff before the old connection is lost. In this work we present the mobile IP model compering to the H.323 protocol model trying to enhance the existing H.323 model for better handoff managment. Our approach allows, during handoff, a mobile terminal to simply close an existing logical channel for an old cell and open a logical channel for a new cell without an extra H.323 connection. The proposed approach needs no modification to the existing H.323 message set and handles environment changes such as bandwidth after handoff, to reduce the handover latency and packet loss during handover. The delay can be reduced and the mobile terminal can handle handoff without MC (Multipoint Controler) functionality .