Читать книгу Intelligent Security Management and Control in the IoT - Mohamed-Aymen Chalouf - Страница 19

In an intelligent radio context, we used the model suggested by Song and Xie (2012) to predict the average channel availability time at instant t. The OFF period represents the period the channel is unavailable. For the ith channel, the cumulative distribution function (CDF) over the duration of the OFF period is given by equation [1.3]:

[1.3]

where t_off represents the duration of the OFF period.

In order to support at least one SU packet (data from a secondary user), the probability that the inactive duration of the ith channel is longer than a transmission time of the frame η should be greater than or equal to θ (see equation [1.4]):

[1.4]

where θ is the probability threshold for a channel to be considered inactive for the next packet transmission.