Research On Molecular Directional Communication Control Technology Based On Chemotaxis Effect In Nano-network

Molecular communication(MC)is a communication technology that uses biochemical signals to exchange information between systems and an interdisciplinary field involving communication theory,biotechnology,and chemistry.Compared with traditional electromagnetic wave communication,molecular communication using molecules and other particles as information carriers is an effective technical way to realize nano-network.It has great potential application value in many fields such as health monitoring and precise targeted drug delivery.The diffusion-based channel model is one of the most typical channel models for molecular communication.In the diffusion channel,the molecules follow the random Brownian motion rule,which will bring about some problems such as non-targeting of molecular motion,prolonged transmission,and low reliability,so the communication rate of molecular communication is far lower than that of electromagnetic communication.Molecular directional communication control technology is considered to be a key technology to improve the efficiency of molecular communication and achieve precise targeted drug delivery.In recent years,it has become a new research direction.However,the non-directional free-diffusion properties of the molecules make it difficult to control the molecular orientation.In this context,thesis mainly studies the technical solution of molecular directional communication control in the application scenarios of drug delivery and target detection: molecular directional communication control can be realized by the chemotactic effect that molecules can respond to chemical stimulation.The main research contents and contributions of thesis are as follows:1.The relationship between the concentration gradient field of attractant and the directional movement of nanomachines is studied.The molecular directional communication control model based on chemotaxis effect is introduced and the performance of the model is analyzed.2.For the scenario of target detection,relay-based molecular directional control model is proposed for the first time.In order to solve the problem that the attractant loses its effect caused by the long-distance diffusion in chemotactic-based molecular directional control model,a relay-based nano-network model is proposed.This model uses several varieties of attractants to expand the range of chemotactic effect.Feasibility of the model and its impact on molecular directional communication and mobility of molecules are analyzed.3.For multi-hop relay-based nano-network model,thesis proposes dynamic relay strategy.The dynamic relay strategy uses only one kind of attractant to assist nanomachines to move to the target,which reduces the complexity of the system and simplifies the function of nano-machines.The simulation results show that the proposed relay-based nano-network model is more effective than the common chemotactic-based molecular directional communication control model.The multi-hop relay strategy can significantly improve the efficiency of directional movement and accelerate the orientation of overall nanomachines.The dynamic relay strategy can outperform the performance of a two-hop relay strategy.