Catastrophic collision in Bio-nanosensor Networks: Does it really matter?

A Wireless Bio-nanosensor Network (WB2N) is a collection of bio-nanodevices having applications in e-health. In this paper, we address the issue of catastrophic collision - a phenomenon which exhibits recurrent collisions of femtosecond-long pulse symbols emanating from the nanodevices in a WB2N. Such type of collision is very serious in these networks due to unique properties of the terahertz band (0.1-10 THz). The existing sate-of-the-art on the issue of coordination for medium access by nano-devices is based on asynchronous exchange of pulses by assigning different symbol rates. The existing method of choosing the symbol rate does not completely avoid catastrophic collision. The severity of collision is further pronounced when molecular absorption noise gets compounded. In essence, a few number of collisions, in turn, invites huge number of such events for the subsequent transmission and eventually degrades the whole network performance. So, it is important to handle such collisions for successful execution of protocols of the higher layers. In present work, we analyze the catastrophic collision in detail and model the collision. The preliminary results exhibit the severity of such collisions in the network. It requires immediate attention in order to accept WB2Ns to be successful e-health system.