4 CogNet Protocol: Architectural Principles Decentralized spectrum coordination as an integral part of protocol capabilities mutual observability achieved via explicit exchange of spectrum information Support for ad hoc network collaboration Beacons that enable network bootstrapping and discovery without infrastructure support Adaptive selection of PHY, MAC, routing methods Control framework that enables on-the-fly selection of data path protocol components Cross-layer control exchanged across protocol layers Access to cross-layer information necessary for cross-layer adaptation Logical separation of control & data for flexible design and low overhead Minimize contention between control & data (…>>50% overhead in 802.11 networks!) Efficient integration with the wired Internet Aggregation of routing and cross-layer control information at boundary/gateway nodes
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