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Providing seamless multimedia services to mobile users is one of the important requirements for the current Internet evolution. However, due to the effects of host mobility, it is difficult to achieve seamless QoS guarantees in mobile Internet. Though Next Step In Signaling (NSIS) protocol was recently proposed as an alternative of RSVP, its applicability has not been completely verified particularly in mobile environment. This paper enhances NSIS protocol based on advance resource reservation using layers 2 and 3 complementation for supporting host mobility. Our approach detects a crossover node (CRN) and reserves network resources proactively along the new path which will be used after handoff This significantly reduces the latency of signaling session re-establishment caused by handoff. Only a few modifications are required to the current NSIS protocol for our approach. The experimental results demonstrate that our approach can provide seamless QoS guarantees for multimedia services in mobile Internet.