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A nanonetwork or nanoscale network is a set of interconnected nanomachines (devices a few hundred nanometers or a few micrometers at most in size), which are able to perform only very simple tasks such as computing, data storing, sensing and actuation. Nanonetworks are expected to expand the capabilities of single nanomachines both in terms of complexity and range of operation by allowing them to coordinate, share and fuse information. Nanonetworks enable new applications of nanotechnology in the biomedical field, environmental research, military technology and industrial and consumer goods applications. Nanoscale communication is defined in IEEE P1906.1.
Classical communication paradigms need to be revised for the nanoscale. The two main alternatives for communication in the nanoscale are based either on electromagnetic communication or on molecular communication.
This is defined as the transmission and reception of electromagnetic radiation from components based on novel nanomaterials. Recent advancements in carbon and molecular electronics have opened the door to a new generation of electronic nanoscale components such as nanobatteries, nanoscale energy harvesting systems, nano-memories, logical circuitry in the nanoscale and even nano-antennas. From a communication perspective, the unique properties observed in nanomaterials will decide on the specific bandwidths for emission of electromagnetic radiation, the time lag of the emission, or the magnitude of the emitted power for a given input energy, amongst others.
For the time being, two main alternatives for electromagnetic communication in the nanoscale have been envisioned. First, it has been experimentally demonstrated that is possible to receive and demodulate an electromagnetic wave by means of a nanoradio, i.e., an electromechanically resonating carbon nanotube which is able to decode an amplitude or frequency modulated wave. Second, graphene-based nano-antennas have been analyzed as potential electromagnetic radiators in the Terahertz band
Molecular communication is defined as the transmission and reception of information by means of molecules. The different molecular communication techniques can be classified according to the type of molecule propagation in walkaway-based, flow-based or diffusion-based communication.
In walkway-based molecular communication, the molecules propagate through pre-defined pathways by using carrier substances, such as molecular motors. This type of molecular communication can also be achieved by using E. coli bacteria as chemotaxis.
In flow-based molecular communication, the molecules propagate through diffusion in a fluidic medium whose flow and turbulence are guided and predictable. The hormonal communication through blood streams inside the human body is an example of this type of propagation. The flow-based propagation can also be realized by using carrier entities whose motion can be constrained on the average along specific paths, despite showing a random component. A good example of this case is given by pheromonal long range molecular communications.
In diffusion-based molecular communication, the molecules propagate through spontaneous diffusion in a fluidic medium. In this case, the molecules can be subject solely to the laws of diffusion or can also be affected by non-predictable turbulence present in the fluidic medium. Pheromonal communication, when pheromones are released into a fluidic medium, such as air or water, is an example of diffusion-based architecture. Other examples of this kind of transport include calcium signaling among cells , as well as quorum sensing among bacteria.
Based on the macroscopic theory of ideal (free) diffusion the impulse response of a unicast molecular communication channel was reported in a paper that identified that the impulse response of the ideal diffusion based molecular communication channel experiences temporal spreading. Such temporal spreading has a deep impact in the performance of the system e.g. in creating the intersymbol interference (ISI) at the receiving nanomachine. In order to detect the concentration-encoded molecular signal two detection methods named sampling-based detection (SD) and energy-based detection (ED) have been proposed. While the SD approach is based on the concentration amplitude of only one sample taken at a suitable time instant during the symbol duration, the ED approach is based on the total accumulated number of molecules received during the entire symbol duration. In order to reduce the impact of ISI a controlled pulse-width based molecular communication scheme has been analysed. The work presented in  showed that it is possible to realize multilevel amplitude modulation based on ideal diffusion. A comprehensive study of pulse-based binary and sinus-based, concentration-encoded molecular communication system have also been investigated.
- IEEE Communications Society Best Readings in Nanoscale Communication Networks
- IEEE P1906.1 Recommended Practice for Nanoscale and Molecular Communication Framework
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- L. Parcerisa and Ian F. Akyildiz, "Molecular Communication Options for Long Range Nanonetworks," Computer Networks Journal (Elsevier), Vol. 53, No. 16, pp. 2753–2766, November 2009.
- M. T. Barros. "Ca2+-signaling-based molecular communication systems: design and future research directions". Elsevier Nano Communication Networks. vol 11, pp 103–113. 2017. 
- "The challenge of molecular communication", Technology Review (Physics arXiv blog), 28 June 2010. 
- H.C. Berg (1993). Random Walks in Biology, Princeton University Press, NJ, USA.
- M.U. Mahfuz, D. Makrakis, and H. Mouftah, "Characterization of Molecular Communication Channel for Nanoscale Networks," in Proc. 3rd International Conference on Bio-inspired Systems and Signal Processing (BIOSIGNALS-2010), Valencia, Spain, 20–23 January 2010, pp. 327–332. 
- M.U. Mahfuz, D. Makrakis, and H.T. Mouftah "On the characterization of binary concentration-encoded molecular communication in nanonetworks," Nano Communication Networks Journal, Elsevier Science, Vol.1 (2010), pp. 289–300. 
- M.U. Mahfuz, D. Makrakis, and H. Mouftah, "On the Detection of Binary Concentration-Encoded Unicast Molecular Communication in Nanonetworks," in Proc. 4th International Conference on Bio-inspired Systems and Signal Processing (BIOSIGNALS-2011), Rome, Italy, 26–29 January 2011, pp. 446–449. [Abstract][.pdf] (Paper # 74)
- M.U. Mahfuz, D. Makrakis, and H. Mouftah, "Characterization of Intersymbol Interference in Concentration-Encoded Unicast Molecular Communication," in Proc. 24th IEEE Canadian Conference on Electrical and Computer Engineering (IEEE CCECE-2011), Niagara Falls, ON, 8–11 May 2011.
- M.U. Mahfuz, D. Makrakis, and H. Mouftah, "On the Characteristics of Concentration-Encoded Multi-Level Amplitude Modulated Unicast Molecular Communication," in Proc. 24th IEEE Canadian Conference on Electrical and Computer Engineering (IEEE CCECE-2011), Niagara Falls, ON, 8–11 May 2011.
- M.U. Mahfuz, D. Makrakis, and H.T. Mouftah, "A Comprehensive Study of Concentration-Encoded Unicast Molecular Communication with Binary Pulse Transmission," in Proc. 11th IEEE International Conference on Nanotechnology (IEEE NANO-2011), Oregon, USA, 15–18 August 2011. 
- M.U. Mahfuz, D. Makrakis, and H.T. Mouftah, "Transient Characterization of Concentration-Encoded Molecular Communication with Sinusoidal Stimulation," in Proc. 4th IEEE International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL-2011), Barcelona, Spain, 26–29 October 2011. 
- Ian F. Akyildiz, F. Brunetti, and C. Blazquez, "Nanonetworks: A New Communication Paradigm," Computer Networks Elsevier Journal, Vol. 52, n. 12, pp. 2260–2279, June 2008.
- Ian F. Akyildiz, and J. M. Jornet, "Electromagnetic Wireless Nanosensor Networks," Nano Communication Networks Elsevier Journal, Vol. 1, n. 1, pp. 3–19, June 2010.
- Ian F. Akyildiz, and J. M. Jornet, "The Internet of Nano-Things," IEEE Wireless Communications Magazine, Vol. 17, n. 6, pp. 58–63, December 2010.
- Nanoscale Networking in Industry
- Instructions to join P1906.1 Working Group
- MONACO Project – Broadband Wireless Networking Laboratory at Georgia Tech, Atlanta, Georgia, USA
- GRANET Project – Broadband Wireless Networking Laboratory at Georgia Tech, Atlanta, Georgia, USA
- NaNoNetworking Center in Catalunya at Universitat Politècnica de Catalunya, Barcelona, Catalunya, Spain
- Molecular communication research at York University, Toronto, Canada
- Research on Molecular Communication at University of Ottawa, Ottawa, Canada
- Convergence Communications Networking Lab. at Yonsei University, Korea
- Wiki on Molecular Communication at University of California, Irvine, California, USA
- Home page of the IEEE Communications Society Emerging Technical Subcommittee on Nanoscale, Molecular, and Quantum Networking.
- P1906.1 – Recommended Practice for Nanoscale and Molecular Communication Framework
- IEEE 802.15 Terahertz Interest Group
- Nano Communication Networks (Elsevier) Journal
- A simulation tool for nanoscale biological networks – Elsevier presentation