Optimal and Heuristic DSA Policies for Cellular Networks with Coordinated Access Band

Konferenz: European Wireless 2009 - 15th European Wireless Conference
17.05.2009 - 20.05.2009 in Aalborg, Denmark

Tagungsband: European Wireless 2009

Seiten: 5Sprache: EnglischTyp: PDF

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Coupechoux, Marceau; Kamal, Hany; Godlewski, Philippe (TELECOM ParisTech & CNRS LTCI, 46, rue Barrault, Paris, France)
Kelif, Jean-Marc (France Telecom R&D, Issy-Les-Moulineaux, France)

Due to the increasing demands for higher data rate applications, also due to the actual spectrum crowd situation, DSA (Dynamic Spectrum Access) turned into an active research topic. In this paper, we analyze DSA in cellular networks context, where a CAB (Coordinated Access Band) is shared between RANs (Radio Access Networks). We propose an SMDP (Semi Markov Decision Process) approach to derive the optimal DSA policies in terms of operator reward. In order to overcome the limitations induced by optimal policy implementation, we also propose a simple, though sub-optimal, DSA heuristic. The achieved reward is shown to be very close to the optimal case and thus to significantly exceed the reward obtained with FSA (Fixed Spectrum Access). Higher rewards and better spectrum utilization with DSA optimal and heuristic methods are however obtained at the price of a reduced average user throughput.