Extended delivery time analysis of opportunistic secondary packet transmission over multiple primary channels
Date
2017-10-04
Authors
Khalid, Muhammad Noman
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Abstract
Cognitive radio (CR) is one of the most prominent technique to deal with the
radio spectrum scarcity problem. CR systems can improve radio spectrum utilization
by opportunistically accessing the underutilized spectrum resource of the licensed
users. In interweave implementation, the secondary user (SU) has to wait and locate
spectrum holes before its transmission. Therefore, the extended delivery time (EDT)
for the secondary user consist of both wait slots and transmission slots. We study
the EDT analysis of fixed size secondary packet transmission over multiple primary
channel. In particular, we introduce a birth-death based approach to model the
cognitive transmission of the secondary user over multiple primary channels. We use
this approach to derive the exact probability density function and probability mass
function of EDT of the secondary transmission for both continuous and periodic
sensing cases. We also present selected numerical and simulation results to verify our
analytical approach and to illustrate the mathematical formulation.
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Keywords
cognitive radio, spectrum scarcity, extended delivery time, primary user, secondary user