… Network operates is the time/ frequency/space-dependent availability of the spectral … the
Cognitive Radio Network including new Medium Access Control protocols. The Cognitive MAC (…

… , eg, [117]–[120], typically make several assumptions that may fail to hold in dynamic spectrum
access networks. For example, most proposals assume that the set of available channels …

… To accommodate the growing demand of wireless networks, the different multiple access
schemes and Cognitive Radio (CR) networks come to fulfill these demands. Multiple access …

… techniques and cognitive radio (CR) networks have been com… access scheme in this novel
cooperative CR (CCR) network … (PUs) and the unlicensed users/cognitive users (CUs) can be …

… Opportunistic spectrum access describes the overlay cognitive access method, where each
cognitive user may transmit through available channels. The common idea in all cases is to …

… In cognitive radio (CR) networks, medium access control (MAC) protocols play an important
… users (PUs), and coordinate the spectrum access amongst secondary users (SUs). In this …

… and cognitive radio in last decade. There are also quite a few surveys on cognitive radio or
DSA networks… primarily focus on network design problems for cognitive radio networks, in this …

… cognitive radio (CR) [1], which can significantly enhance the spectrum utilization by allowing
a group of unlicensed secondary users (SUs) to opportunistically access … medium access …

… to exploit its dynamic nature of the scarce spectrum access. Users of wireless networks
which are … On the other hand, users of cognitive radio networks, which access the spectrum …

… on the non-time-slotted cognitive-radio based DSA networks, which impose more challenges
as compared with the time-slotted cognitive-radio based DSA networks. In particular, we …