Multi-channel Handshake Protocols In Cognitive Radio Networks

In wireless networks, handshake refers to the process that both of the source deviceand the destination device get ready on the same channel or in the same timeslot beforetransmitting data information, aiming to establishing communication. In this paper, wemainly focus on multi-channel handshake protocols in cognitive radio networks. First ofall, a brief introduction to cognitive radio and its recent development is made. Then, themulti-channel handshake protocols in distributed networks are studied, and theadvantages and disadvantages are summarized. As followed, the control channel basedhandshake protocols, which suit for cognitive radio networks, are investigated, andmodels are built to analyze the control channel saturation problem and the unstablecontrol channel problem. In order to settle the problems mentioned above, a channelgrouping strategy is presented, our main idea is to divide the channels into multiplegroups, which supports communication between users in the same group andcoordination between users in different groups. The simulation estimated the averagehandshake times, the collision possibility and delay under different channel occupationsituations. The results showed that our proposed strategy is capable of improving theperformance of the cognitive system. Finally, two USRPs are used to simulate SU pair,and a multi-channel scene is emulated, the channel grouping based handshake protocolis implemented on hardware.