Section: Application Domains

Cognitive Radio Networks

Usually in cognitive radio, the secondary users are in charge of monitoring the channel to determine whether or not the primary users are active in the area. If they are not, the secondary users are allowed to use the spectrum left unused by the primary users. We are interested in two issues:

• Design and modeling of a new access scheme based on a generalized Carrier Sense Multiple Access scheme using active signaling. This scheme allows the primary users to capture the bandwidth even if the secondary users are transmitting in the area.

• Design of a time slot and channel assignment to minimize the data gathering performed by secondary users. This assignment should work with different detection schemes of primary user presence.