TBONE: A mobile-backbone protocol for ad hoc wireless networks

Abstract

Ahstrort-We introduce an ad hoc wireless mobile network that employs a hierarchical networking architecture. The network uses high capacity and IOU, capacity nodes. We present a topological synthesis algorithm that selects a subset of high capacity nodes to fomi a backbone nehvork. The latter consists of interconnected backbone nodes that intercommunicate across high power links, and also makes use of (airhome, ground and underwater) Uiimanned Vehicles (UVs). Each backbone node manages the allocation of communications resources for transport of messages frondto itself and among nodes that reside in its managed cluster of nodes (access net). Backhone nodes also interact to coordinate the allocation of MAC layer communications s e t s (such a? time slots) in their access nets to prevent (cross net) interferences. When covered by a backbone node, a mobile node is granted a proper set of time slots (or, equivalently, YDMA andior COMA slots) for direct communications to a local destination, or for accessing the dynamically contigured hackhone netvvork Cor long-range communications. When uncovered, a node uses a flat multi-hop ad hoc networking scheme. We introduce the TBONE protocol to implement the key networking schemes for such a Mobile Backbone Network (MBN). It includes combined network layer operation, i.e. mobile backbone network topological synthesis, and MAC layer resource allocation schemes. The TBONE protocol serves lo allocate resources across the network to ensure that user applications are granted acceptable quality-of-service (QoS) performance, while striving to ensure a highly ,survivable and robust backhoneoriented networking architecture. We present elements ofthe protocol and key involved algorithms, and illustrate the distinctive advantages offered by the TBONE based mobile backbone nehvork.Key event class 4 (RN covering)-If an unassociated RN hears at least a single node that is identilied as a BN or an associated BCN, it initiates the Anet association algorithm. The occurrence of any key event in this class indicates that an unassociated RN may associate with a BN.Key event class 5 (BCN covering). If an unassociated BCN hears at least a single node that is identified as a BN, it initiates the Anet association algorithm. The occurrence of any key event in this class indicates that an unassociated BCN may associate with a BN.Key event class 6 (BCN covering)-If an unassociated BCN utilizing its low power radio module cannot hear any BN for a predefined period of time. but receives information from at least one unassociated BCN, it initiates the UN election algorithm. The occurrence of any key event in this class indicates that by selecting a BCN among a certain set of nodes and converting it into a BN, a necessary condition for associating an unassociated BCN to a BN is provided. Key event class 7 (BCN covering)-If an unassociated BCN only hears KNs and/or associated BCNs or it cannot hear any node for a predefined period of time, it initiates the BN election algorithm. Note that this is a "degenera...

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