Resource Allocation with MAC Layer Node Cooperation in Cognitive Radio Networks

Abstract

An algorithm for cooperative Dynamic Spectrum Access in Cognitive Radio networks is presented. The proposed algorithm utilizes Medium Access Control layer mechanisms for message exchange between secondary nodes that operate in license exempt spectrum bands, in order to achieve interference mitigation. A fuzzy logic reasoner is utilized in order to take into account the effect of the coexistence of a large number of users in the interference as well as to cope for uncertainties in the message exchange, caused by the nodes' mobility and the large delays in the updating of the necessary information. The proposed algorithm is applied in Filter Bank Multicarrier, as well as Orthogonal Frequency Division Multiplexing systems, and its performance is evaluated through extensive simulations that cover a wide range of typical scenarios. Experimental results indicate improved behaviour compared to previous schemes, especially in the case of uncertainties that cause underestimation of the interference levels.

Enablers for Energy-Aware Cooperative Decision and Control in Wireless Networks

“…Algorithms that employ cooperative spectrum sharing in order to maximise the overall system performance and minimise energy consumption are a key evolutionary step for practical cooperative systems [18]. These algorithms need to be distributed and employ efficient message exchange in order to maximise the overall system utility.…”

Learning enhanced situation perception for self-managed networks

“…Fuzzy Inference Systems (FIS) have been used extensively in the past for automatic control, data classification, decision analysis, and telecommunication systems. In terms of this thesis the focus in on telecommunication systems where fuzzy logic has been used for decision making [119], [120], [121], event identification, and event classification [122], [123], environment modeling [124], etc. (the list of the application fields, nor the literature work is exhaustive).…”