CN104393967A - Single link reliability determining method based on a binary molecular communication model - Google Patents

Abstract

A single link reliability determining method based on a binary molecular communication model comprises the following processes: analyzing reliability of multicast scenes in a successful link, in a binary molecular communication model, representing bit 0 and 1 by using molecules with different types, wherein after a nanometer machine at a sending side releases a molecule, the molecule carious out Brownian movement in a medium, and as to a transmission between the two nanometer machines in a single link, the reliability of the link is defined as a probability that the nanometer machine at a receiving side receives at least one molecule. The invention provides the single link reliability determining method based on a binary molecular communication model, which analyzes reliability effectively and has great practicability.

Description

Based on the single-link reliability defining method of binary system molecule traffic model

Technical field

The present invention relates to biotechnology, nanometer technology, the communication technology, is a kind of single-link topological structure network based on binary system molecule traffic model, especially single-link reliability defining method.

Background technology

The fast development of biotechnology and nanometer technology is that road has been paved in the manufacture of the nano-machines of nanoscale size.Nano-machines is considered to function device the most basic on nanoscale.Nano-machines has good application prospect in medical science and industrial circle.But the realization that nano-machines is applied in these areas is easy to the constraint being subject to nano-machines own characteristic, the less size of such as nano-machines and unknown physical property and cause nano-machines uncontrollability in the application, unsteadiness.These problems can be solved by the coordination of nanoscale communication between nano-machines, thus the network defined between nano-machines is called nanometer network.Nanometer network can coordinate the mode information sharing of different nano-machines by cooperation, thus can complete complicated task in the larger context.

Molecule communication is a kind of novel communication mode between nano-machines, is a kind of using biochemical molecule as information carrier, is spread mutually communicate, for nano-machines to form the communication technology of distributed nanometer network by molecule in biotic environment.The carrier molecule of information is called as informational molecule.The basic communication process of molecule communication comprise information coding, transmission, transmit, receive the decode five steps.In molecular communication system, being generated by the transmit leg nano-machines of information can the side's of being received nano-machines identification the informational molecule received, and based on the physics of informational molecule or chemical characteristic coded message.After the informational molecule that transmit leg nano-machines discharges is transferred to recipient's nano-machines by fluid (liquid or gas) medium, receive also decoded information in a particular manner by recipient's nano-machines.

Molecule communication has many superperformances, and the informational molecule of such as particular type can carry bulk information, the various primary assembly of nano-machines directly and in biosystem can be enable to interact, have bio-compatibility; In addition, molecular communication system can also obtain sufficient energy from the chemical reaction environment, transmits with support information.Molecule communication is not due to by the restriction of the factors such as the volume of transceiver and energy consumption, and be applicable to (such as in human body) in many specific applied environments, therefore academia generally believes that the molecule communication inspired based on biology realizes one of the most feasible communication technology of nanometer network.

Summary of the invention

In order to overcome the deficiency effectively cannot determining reliability of existing single-link topological structure network, the invention provides the single-link reliability defining method based on binary system molecule traffic model that a kind of effective parsing reliability, practicality are good.

The technical solution adopted for the present invention to solve the technical problems is:

Based on a single-link reliability defining method for binary system molecule traffic model, described reliability defining method process is as follows:

In binary system molecule traffic model, the transmission of 0 or 1 is represented with the different molecule type of transmission, after transmit leg nano-machines release molecule, molecule is in media as well with the motion of Blang's form, and a molecule from transmit leg nano-machines to the probability density function f (t) apart from the recipient's nano-machines required time t for d is:

$f\left(t\right)=\frac{d}{\sqrt{4\mathrm{\πD}{t}^3}}{e}^{-\frac{d^2}{4\mathrm{Dt}}},t>0$

Wherein, d is the distance between transmit leg nano-machines and recipient's nano-machines, and D is biotic environment diffusion coefficient;

Cumulative distribution function F (t) corresponding to this probability density function is:

$F\left(t\right)=1-\mathrm{Erf}\left(\frac{d}{2\sqrt{\mathrm{Dt}}}\right),t>0$

For single-link two nano-machines between transmission, the reliability definition of link is the probability that recipient's nano-machines receives at least one molecule, uses β _ijrepresent, by following formulae discovery:

β _ij＝1-(1-F(τ)) ^nN

Wherein, N is that transmit leg nano-machines discharges the number of molecule each time slot (i.e. time slot), and T is the transmission time, T is divided into n time slot, is T=n τ, and n is the number of time slot, and τ is the time that each time slot continues.

Further, for the reliability β under single-link retransmission mechanism _ij' representing, computing formula is:

${{\mathrm{\β}}_{\mathrm{ij}}}^{\′}={\mathrm{\β}}_{\mathrm{ij}}+(1-{\mathrm{\β}}_{\mathrm{ij}}){\mathrm{\β}}_{\mathrm{ij}}+{(1-{\mathrm{\β}}_{\mathrm{ij}})}^2{\mathrm{\β}}_{\mathrm{ij}}+...+{(1-{\mathrm{\β}}_{\mathrm{ij}})}^{f_{\mathrm{ij}}}{\mathrm{\β}}_{\mathrm{ij}}=\underset{m=0}{\overset{f_{\mathrm{ij}}}{\mathrm{\Σ}}}{(1-{\mathrm{\β}}_{\mathrm{ij}})}^m{\mathrm{\β}}_{\mathrm{ij}}$

Wherein, f _ijfor the maximum retransmission of single-link, β _ijfor the reliability of Successful transmissions single-link.

Technical conceive of the present invention is: the bio-compatibility of the abundant binding molecule communication of the present invention, low rate, transmission range finiteness, the features such as higher Loss Rate, main exploitation can be used for the reliable efficient data communication technology based on molecule communication of nanometer network.

In binary system molecule traffic model, represent the transmission of bit 0 or 1 with the different molecule type of transmission.Due in molecule communication process, the molecule of transmit leg nano-machines release carries out diffusion transport in a fluid, and causing molecule to arrive recipient's nano-machines has higher unreliability, considers that molecule communication network topology structure has important impact to reliability simultaneously.Therefore, how ensureing that binary system molecule traffic model information transmission in multicast scene is is reliably need to launch and the key issue furtherd investigate further.

Beneficial effect of the present invention is mainly manifested in: 1, effectively resolve reliability, practicality is good, based on binary system molecule traffic model, analyze the analytical expression of the reliability of single-link topological structure, and the analytical expression under retransmission mechanism.Reliability is analyzed along with the distance between parameter nano-machines by mathematic(al) representation, biotic environment diffusion coefficient, transmit leg nano-machines discharges the number of molecule at each time slot, the number of time slot, and the variation tendency that the time variations that continues of each time slot presents; 2, based on stop and wait ARQ (the Stop-wait Automatic Repeat reQuest) retransmission mechanism of binary system molecule traffic model, by controlling maximum retransmission, and determine that recipient's nano-machines replys the Molecules of confirmation (ACK), the probability that ACK molecule is received is improved on to greatest extent, ensure that the reliability of transmission simultaneously, decrease time cost, also greatly reduce complexity.

Accompanying drawing explanation

Fig. 1 is the topological structure of single-link.Wherein, TN is transmit leg nano-machines, and RN is recipient's nano-machines.

Fig. 2 is the schematic diagram of the reliable efficiently design of single-link based on binary system molecule traffic model.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

See figures.1.and.2, a kind of single-link reliability defining method based on binary system molecule traffic model, comprises the steps:

In order to analyze based on the reliability situation of binary system molecule traffic model under single-link topological structure, set up the research scene of single-link.

Fig. 1 is the topological structure of single-link.Wherein, TN is transmit leg nano-machines, and RN is recipient's nano-machines.

For single-link two nano-machines between transmission, the reliability definition of link is the probability that recipient's nano-machines at least receives a molecule, uses β _ijrepresent, use following formulae discovery:

β _ij＝1-(1-F(τ)) ^nN

Wherein, N is that transmit leg nano-machines discharges the number of molecule at each time slot.Here, T is the transmission time, T is divided into n time slot, is T=n τ, and n is the number of time slot, and τ is the time that each time slot continues.

Fig. 2 is the design of the reliable efficient single-link scheme based on binary system molecule traffic model.

By the retransmission mechanism of ARQ (Stop-wait Automatic Repeat reQuest), analyze based on binary system molecule traffic model at single-link, reliability in single path and multipath under this retransmission mechanism situation and the analytical expression of time delay, and carry out reliability and delay character analysis in multicast scene on this basis.Under ensureing the reliability prerequisite that recipient's nano-machines receives, reduce the average delay needed for molecule reception, thus ensure that the reliable high efficiency of the program.

For the Calculation of Reliability formula under single-link retransmission mechanism be:

${{\mathrm{\β}}_{\mathrm{ij}}}^{\′}={\mathrm{\β}}_{\mathrm{ij}}+(1-{\mathrm{\β}}_{\mathrm{ij}}){\mathrm{\β}}_{\mathrm{ij}}+{(1-{\mathrm{\β}}_{\mathrm{ij}})}^2{\mathrm{\β}}_{\mathrm{ij}}+...+{(1-{\mathrm{\β}}_{\mathrm{ij}})}^{f_{\mathrm{ij}}}{\mathrm{\β}}_{\mathrm{ij}}=\underset{m=0}{\overset{f_{\mathrm{ij}}}{\mathrm{\Σ}}}{(1-{\mathrm{\β}}_{\mathrm{ij}})}^m{\mathrm{\β}}_{\mathrm{ij}}$

Wherein, f _ijfor the maximum retransmission of single-link, β _ijfor the reliability of Successful transmissions single-link.

Claims (2)

1. based on a single-link reliability defining method for binary system molecule traffic model, it is characterized in that: described reliability defining method process is as follows:

In binary system molecule traffic model, the transmission of bit 0 or 1 is represented with the different molecule type of transmission, after transmit leg nano-machines release molecule, molecule is in media as well with the motion of Blang's form, and a molecule from transmit leg nano-machines to the probability density function f (t) apart from the recipient's nano-machines required time t for d is:

$f\left(t\right)=\frac{d}{\sqrt{4\mathrm{\πD}{t}^3}}{e}^{-\frac{d^2}{4\mathrm{Dt}}},t>0$

Wherein, d is the distance between transmit leg nano-machines and recipient's nano-machines, and D is biotic environment diffusion coefficient;

Cumulative distribution function F (t) corresponding to this probability density function is:

$F\left(t\right)=1-\mathrm{Erf}\left(\frac{d}{2\sqrt{\mathrm{Dt}}}\right),t>0$

For single-link two nano-machines between transmission, the reliability definition of link is the probability that recipient's nano-machines receives at least one molecule, uses β _ijrepresent, by following formulae discovery:

β _ij＝1-(1-F(τ)) ^nN

Wherein, N is that transmit leg nano-machines discharges the number of molecule at each time slot, and T is the transmission time, T is divided into n time slot, is T=n τ, and n is the number of time slot, and τ is the time that each time slot continues.

2., as claimed in claim 1 based on the single-link reliability defining method of binary system molecule traffic model, it is characterized in that: for the reliability β under single-link retransmission mechanism _ij' representing, computing formula is:

${{\mathrm{\β}}_{\mathrm{ij}}}^{\′}={\mathrm{\β}}_{\mathrm{ij}}+(1-{\mathrm{\β}}_{\mathrm{ij}}){\mathrm{\β}}_{\mathrm{ij}}+{(1-{\mathrm{\β}}_{\mathrm{ij}})}^2{\mathrm{\β}}_{\mathrm{ij}}+...+{(1-{\mathrm{\β}}_{\mathrm{ij}})}^{f_{\mathrm{ij}}}{\mathrm{\β}}_{\mathrm{ij}}=\underset{m=0}{\overset{f_{\mathrm{ij}}}{\mathrm{\Σ}}}{(1-{\mathrm{\β}}_{\mathrm{ij}})}^m{\mathrm{\β}}_{\mathrm{ij}}$

Wherein, f _ijfor the maximum retransmission of single-link, β _ijfor the reliability of Successful transmissions single-link.