Study on Dynamic Spectrum Management Modelfor Interactive Cognitive Radio
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Graphical Abstract
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Abstract
In Interactive cognitive radio networks
(ICRN), secondary usage of spectrum is of competition and
con°ict, and radio frequency environment is time-varying.
In order to realize real-time secondary spectrum usage, we
propose architecture based on SoftMan for the ICRN. In
this architecture, the ICRN are divided into many coali-
tions according to geographical locations, utilization de-
gree of spectrum, frequency range and transmission power
level. In one coalition, a dynamic spectrum management
model based on di®erential games is proposed, and feed-
back Nash equilibrium solution to the non-cooperative dif-
ferential games is given and analyzed. Di®erential games
study a class of decision problems, under which the evolu-
tion of the state is described by a di®erential equation and
the players act throughout a time interval. So the model
can ensure real-time secondary spectrum usage. The simu-
lation results show that the model can improve e±ciency of
spectrum utilization, and re°ect realistically time-varying
radio frequency environment. It also constitutes the theo-
retical foundation for the spectrum management in a dy-
namic environment.
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