Dynamic Control of Open Spectrum Management
This paper focuses on sharing of open spectrum under a new sharing policy of prioritized dynamic spectrum leasing, where the designated spectrum broker dynamically allocates time-varying unused licensed spectrum resources to secondary networks of various access priorities. The proposed optimal stochastically controlled dynamic guard bandwidth (OSC-DGB) scheme enables the spectrum broker to adapt differentiated capacity limits of open spectrum for prioritized connection accesses by secondary networks in anticipation of their access request rates, which are expected to be opportunistic and non-stationary. The differences in capacity limits determine the amount of guard band reserved for the higher priority secondary networks. This spectrum adaptation problem is formulated as a finite-horizon Markov decision process to minimize service denials of secondary networks according to their spectrum access priorities, which is solved through dynamic programming. Numerical results show that OSC-DGB enables close tracking of connection blocking targets while optimizing resource utilizations.