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A QoS extension for next step in signaling in mobile IPv6 environment

In this paper, we introduce an end-to-end QoS provisioning mechanism based on NSIS (Next Step In Signaling) protocol suite in mobile IPv6 environment. Resource reservation on the new path must be done as quickly as possible after handover event for the Mobile Node (MN) which is especially important when real-time applications are used. We focus on end-to-end procedure for a fast QoS re-establishment, the basic idea of which is to reduce the time between the handover event and the NSIS state re-establishment on the new path. It is designed to send the NSIS signaling message together with Binding Update (BU)/Binding Acknowledgement (BA) after handover, in order to avoid wasting time to wait for mobility detecting. We propose to buffer at the CRossover Node (CRN) the packets directed to the Mobile Node during the handover. In this way the total QoS re-establishment time is reduced. Moreover, we list the issues it may meet during the handover process, the CRN discovery, IP-in-IP problem, double-reservation problem, etc., according to which we also propose relevant solutions.