Opportunistic spectrum access over mobile WiMAX networks

Opportunistic spectrum access (OSA) currently receives a constantly growing interest due to the under-utilization of the licensed spectrum. OSA refers to identifying and exploiting spatiotemporal underutilized spectrum portions in order to be occupied by unlicensed-secondary users. The efficiency of an OSA scheme is strongly correlated with the adopted sensing strategy and primary user activity model. A design focusing on a given (pre-specified) primary system is expected to result in improved performance, by exploiting system´s specific operational features. This paper provides a suitable system model and a highly efficient opportunistic spectrum assignment algorithm under an infrastructure-based architecture, assuming a mobile WiMAX network as the primary system.