A seamless handoff scheme for IEEE 802.11 wireless networks
The advance of computer network technologies such as IEEE 802.11 wireless local area network has made it possible for users to connect to Internet almost anywhere. A mobile node (MN) is likely to move between different base stations while running applications. The IETF has defined the Mobile IP (MIP) to allow MNs to maintain their communication uninterrupted while roaming across different IP subnets. However, the mechanisms defined in MIP may cause undesired connection disruptions or packet losses, which will significantly degrade the quality of real-time applications. It is an important and challenging issue to support seamless handoff management. To achieve seamless handoff, we propose a unified scheme to address application quality degradation. Our main contribution is the concept and implementation of utilising buffering and resending method to eliminate the packet losses while keeping the end-to-end delay of real-time traffic flow in an acceptable value. The NS-2 simulation results show that our proposed scheme can significantly maintain application quality during layer-2 and -3 handoffs. Copyright (C) 2011 John Wiley & Sons, Ltd.
seamless handoff roaming ieee 802 11 mobile ip protocol