Due to the high dynamic characteristics of the low-orbit satellite networks, the frequent handovers of the users led to heavy mobility management load and large handover delay. To solve these problems, one mobility management mechanism based on the virtual agent domain (VAD) is proposed. In this mechanism, a virtual agent cluster (VAC) is designed to co-manage the network architecture of users in the corresponding VAD. With the on-board processing and switching capabilities, the architecture of the distributed mobility management mechanism is adopted to support the information sharing between the VACs, which reduces the performance requirements for single satellite and improves the system scalability. Then, we construct the home mobile-agent-anchor (HMAA) and the local MAA. In this way, the MN triggers a binding update to the HA only when the home MAA is lost, and the MN's switching within the VAD only needs to update its intra-domain relations, which reduces the overhead of mobility management and switching delay. Furthermore, the proposed scheme is theoretically evaluated in terms of the signaling overhead and handover latency. Finally, the numerical simulation results are presented to verify the efficacy of our scheme. The experimental platform also demonstrates the availability and efficiency of the new mechanism.INDEX TERMS Low-orbit satellite network, mobility management protocol, virtual agent domain, information sharing, home mobile agent anchor, simulation platform.
Although reports of human infection with influenza A(H5N6) increased in 2021, reports of similar H5N6 virus infection in poultry are few. We detected 10 avian influenza A(H5N6) clade 2.3.4.4b viruses in poultry from 4 provinces in China. The viruses showed strong immuneescape capacity and complex genetic reassortment, suggesting further transmission risk.
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