March 9, 2009
Hosted by: Prof. Gil Zussman
Speaker: Siamak Sorooshyari, Bell Labs, Alcatel-Lucent
The notion that spectrum is a scarce and diminishing commodity has been derived from static frequency allocations that are being increasingly labeled as outdated. The underutilization of spectrum is a driving force behind research on efficient techniques for spectrum access. The deployment of cognitive radio networks is a means of allowing for efficient spectrum sharing and opportunistic spectrum access. It presents new challenges to the classical problem of interference management in wireless networks. Dynamic power allocation is an essential feature in cognitive radio that has been under-explored in comparison to power control in cellular networks. This work develops a general framework for power allocation in cognitive radio networks based on four goals: QoS protection to primary users, opportunism to secondary users, admissibility to secondary users, and autonomous operation by individual users. Two additional goals that are desirable rather than essential are also presented. A general class of Dual Priority Class Power Control (DPCPC) policies that satisfy such goals are introduced.
Through theoretical analysis and simulation, it's shown that a specific interference-aware power control algorithm can address such goals.