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Fig. 1 Spectrum channel structure with multiple frames.
An MVNO seeks transmission opportunities (TXOPs) on the PO's licensed spectrum channel(s) by spectrum sensing.
To detect spectrum holes, unlicensed wireless devices are sensing constantly the allocated spectrum channel.
Based on the TDMA mechanism, the licensed spectrum channel consists of sequential frames.
Del Ser et al. (2012) applied HS to the spectrum channel allocation problem.
In other word, each spectrum channel is divided as multiple frames [17].
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The limited number of spectrum channels.
They sense the spectrum channels and send the r information to the CBS.
The disjoint mechanism has the lowest data rate since fixed spectrum channels assignment is acquired.
In this approach, spectrum channels are represented by different colors and SUs are denoted by vertices.
For opportunistic spectrum use, each vehicle senses a set of spectrum channels for detecting the presence of primary users.
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