IETF (Internet Engineering Task Force) has proposed a PMIPv6 (Proxy Mobile IPv6) to make up for the weak points caused by handoff delay and signaling overhead. The handoff delay and signaling overhead occur due to frequent binding updates during handoff in the MIPv6 (Mobile IPv6). Although the handoff in the PMIPv6 can be faster than that in the MIPv6, there still exists the handoff delay and packet loss during the handoff. For these reasons, the researches to reduce the handoff delay and retransmit missing packets have been investigated. We propose a scheme in order to set up the multicast group. As a result, the scheme reduces the handoff delay by using the cache and prevents the packet loss in the PMIPv6. We have analyzed general handoff performance in the PMIPv6 and packet loss occurring interval from a practical point of view to verify the proposed scheme.

PMIPv6 has been proposed in network-based localized mobility management (NetLMM) of IETF. The PMIPv6 copes with the disadvantages of client-based mobility technology by utilizing network-based mobility technology in which the handover function of a mobile node (MN) is replaced by a router. However, the PMIPv6 has the critical problem that inter-cell handover is not supported. In order to support the intercell handover in the PMIPv6, an all neighbor multicast (ANM) scheme has been proposed. Meanwhile, the ANM scheme wastes resources for sending multicast messages because the multicast messages are not sent only to handover-occurring-cells but also other neighbor cells. In this paper, a network router recognizes the MN newly entered at the boundary of the cell. We propose an intelligent multicast configuration (IMC) scheme for the inter-cell handover. Using the proposed scheme, the consumption of resources and the whole load of networks are reduced by up to 64% compared to the ANM scheme.

IETF (Internet Engineering Task Force) has proposed the use of PMIPv6 (Proxy Mobile IPv6) over Mobile IPv6 which has the problem of handover latency and signaling overhead caused by binding update(BU). However, considering that PMIPv6 provides the fast handover only in intra-domain, not inter-domain. IETF is debating whether to go back to the previously proposed method, MIPv6, which allows handover in inter-domain [1]. Using MIPv6 in intra-domain also has two major drawbacks: it requires IP update which cannot maintain L4 connectivity and it takes longer handover time due to the latency in binding update of MIPv6. This paper proposed adding the multicast server to PMIPv6, a method that allows the handover in inter-domain without delaying the handover in intra-domain. Adding the multicast server keeps L4 connectivity in both domains and application layer as well; therefore, it enables the seamless service based on IP anywhere. Moreover, this method reduces handover latency so that it takes much less time than using MIPv6. To prove this, the performance of PMIPv6 and the new MIPv6 used in intra and inter domains have been analyzed and compared in practical point of view.

WinWin is a system that aids in the capture and recording of system requirements. It also assists in negotiation. The WinWin system has been available for several years and is being used by dozens of software development groups. In this presentation we go over the capabilities of the system and discuss how it might be used on your software development project.