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A Distributed Mode Reassignment Scheme for Mobile Multihop Wireless Network of FDD Nodes

The use of frequency division duplex (FDD) communication in a multihop wireless network partitions the nodes in two operating modes. Since the FDD nodes of the same mode cannot communicate with each other, it can limit the node connectivity and also lead to network partitioning. In this article, a novel, distributed, low-complexity mode reassignment (MR) scheme is designed for maintaining connectivity among the mobile FDD nodes in a decentralized, multihop wireless (airborne) network. Since it is not practical to know the complete topology of such a network in real time, the proposed scheme is fully distributed, relies only on the local node information, and applied only on those nodes whose connectivity drops below a threshold. Besides maintaining a desired value of connectivity degree for each node while it is moving around, the proposed MR scheme also minimizes the impact of mode change on the existing links and ongoing data transmissions. A Kalman filter based node mobility prediction and link failure prediction scheme is designed to select the best candidate nodes for mode change. The optimality and error control bounds of the proposed MR scheme show that it consistently achieves optimal connectivity for most nodes, while requiring a low number of nodes undergoing the mode change during each MR round.