In this paper, we propose a novel bandwidth-efficient handoff scheme for proxy mobile IPv6 networks. Mobile nodes (MNs) are classified as either slow or fast; first, though, to implement a bandwidth-efficient handoff scheme, an MN should be registered in a microcell. The microcell is overlapped to handle an overflow session request, which is nested; in a macrocell, an overflow session request makes a request to return from the boundary of the new microcell. If idle session traffic is in a cell, it is requested by the target microcell. If the total systemic traffic load is not very large, the proposed scheme provides the best bandwidth efficiency and a more favorable quality of service (QoS) for an MN without the incurrence of a large systemic processing cost.
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