Cooperation of RSVP, DiffServ for frequent and fast intersubnet handoff

For the problems raised by frequent and fast intersubnet handoff, some methods based on resource reservation protocol (RSVP) extensions or differentiated services (DiffServ) model have been proposed. The merit and drawbacks of these methods are described in this paper respectively. Then a new scheme is proposed which include the merit of RSVP and DiffServ. It can explicitly provide enough quality of service (QoS) guarantee using RSVP in normal case. When the mobile host moves fast and occurs frequent intersubnet handoff, it immediately uses DiffServ to provide temporary QoS guarantee and keep handoff no dropping.