Cognitive Networks: Towards Self-Aware Networks

11.6. Cognitive Network Architectures

In this section, we briefly introduce some recent developments in cognitive network architectures and discuss the attacks presented in Section 11.5 in the context of these architectures.

11.6.1. Nautilus

Nautilus (http://www.cs.ucsb.edu/htzheng/cognitive/nautilus.html) is a distributed, scalable and efficient coordination framework for open spectrum ad-hoc networks. The Nautilus framework addresses the lack of a common control channel faced in distributed cognitive network architectures. Some collaborative spectrum access schemes that do not rely on a centralized entity or a common control channel are proposed. One of the proposed collaborative schemes is based on graph coloring, where a topology-optimized allocation algorithm is used for a fixed topology. For mobile cognitive networks, a distributed spectrum allocation based on local bargaining is proposed, where mobile users negotiate spectrum assignment within local self-organized groups. For resource-constrained cognitive devices, a rule-based spectrum management is proposed, where unlicensed users access spectrum according to some predetermined rules and local spectrum observations. Although these novel techniques make spectrum access in cognitive networks more robust and independent of a centralized authority, other security attacks like spectrum handoff attacks, routing attacks, jellyfish attacks pose significant threat to the Nautilus architecture.

11.6.2. Dimsumnet

DIMSUMnet architecture ...