Abstract –
Radio spectrum is the basic resource to carry
information for wireless networks and cyberphysical
system (CPS) relies on wireless networks
for devices control and information backhaul. But,
the increasingly CPS wireless applications badly
affects spectrum scarce situations. For the existing
spectrum allocation schemes, an efficient way
against spectrum scarcity is considered to be dynamic
spectrum access (DSA). Cognitive femtocells, with
spectrum environment observation and parameters
adaption abilities, can access and share more
valuable spectrum dynamically to support massive
wireless service deployment.
Keywords – cognitive radio, femtocells, duty cycle
I. Introduction
Due to massive network scale of CPS, the wireless
networks suffer heavy traffic load. The basic
resource to carry information for wireless networks
is radio spectrum. Because of the exponential data
growth, the efficient use of radio spectrum in CPS
communication becomes necessary. The efficient
spectrum utilization provides efficient spectrum
opportunities for emergent technologies or services
and utilizes already crowded frequency bands with
better spectrum efficiency. The problem of spectrum
scarcity caused by static spectrum allocation
schemes is solved by dynamic spectrum access
(DSA) technology.