Research On Directed Communication Mechanism In Molecular Communication

Molecular communication is a technology that uses biological or chemical signals to exchange information between transmitters and receivers.The signal carrier for molecular communication is usually biological,chemical molecules or artificial nanomachines at the nanometer scale.A communication method using these signal carrier between multiple nano communication entities can realize a nano network.Nano-networks have great potential in many applications,especially in the field of biomedicine,such as targeted delivery of drugs,can be realized through nano-networks,which also requires the nanomachines in the nano-networks to be able to communicate directionally.In molecular communication systems,channels are often diffusive,and information carriers have the characteristics of random movement,this requirement is difficult to meet.Directed communication mechanism is one of the key technologies applied in many biomedical fields.In this paper,different directional communication mechanisms in molecular communication are studied,and some research results have been obtained.At the same time,the physical simulation platform at the macro scale is also improved.The main research contents and contributions of this paper are as follows:1.The advantages and disadvantages of multihop relay strategy based on chemotaxis effect are studied based on previous work.This relay strategy uses relay nodes to expand the influence range of the target,enabling more nanomachines to detect the target in a shorter time,which solves the problems slow detection speed.Through simulation experiments,the effectiveness of the multi-hop relay strategy is verified,and its shortcomings are analyzed.2.A collaborative algorithm is proposed.The collaborative algorithm uses the nanomachine itself to carry the attractant,and when the attractant released by the target is detected,it can release the attractant carried by itself,so that the surrounding nanomachine can detect the target faster.At the same time,problems such as the positioning and deployment of relay nodes are avoided.Simulation experiments verify the effectiveness of this collaborative algorithm and achieve better results than the multi-hop relay strategy.3.An acceleration algorithm based on auxiliary positioning nodes is proposed.This acceleration algorithm speeds up the nanomachine's target detection process by assuming the position information released by the positioning node under the assumption of point-to-point communication.Simulation experiments have been performed to verify its effectiveness and the influence of related parameters in the system on system performance.4.A directed communication model based on the magnetotactic effect is established,and the mathematical expression of the model is used to calculate the probability expression of the number of magnetic nanoparticles observed at the receiver over time and the corresponding bit error rate.The simulations verify the effectiveness of the molecular directional communication mechanism based on the drive effect.A directed communication model based on the phototaxis effect is also established,and the influence of the incident light intensity and light wavelength on communication performance was discussed.Simulation verified the validity of the molecular directional communication model based on the phototaxis effect.5.Improve the macro-scale physical simulation platform for molecular communication.Based on previous work,new sensors have been connected to this macro-scale physical simulation platform,and new software tools have been developed.The platform can perform physical simulation experiments on a macro scale for multihop relay strategies and directed molecular communication based on the phototaxis effect.On a macro scale,this physical simulation platform can be used to quickly and simply verify molecular communication theory.In this paper,results show that the multi-hop relay strategy,the cooperative algorithm,the acceleration algorithm based on the auxiliary positioning node,and the directed molecular communication based on the magnetotactic and phototaxis effect can all improve system performance.At the same time,the physical simulation platform at the macro scale is improved,and some of these studies can be verified by this platform.