CN110460167A - A kind of source of radio frequency energy arrangement and transmitting power setting method - Google Patents
A kind of source of radio frequency energy arrangement and transmitting power setting method Download PDFInfo
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- CN110460167A CN110460167A CN201910583261.3A CN201910583261A CN110460167A CN 110460167 A CN110460167 A CN 110460167A CN 201910583261 A CN201910583261 A CN 201910583261A CN 110460167 A CN110460167 A CN 110460167A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
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Abstract
A kind of source of radio frequency energy arrangement and transmitting power setting method, the case where for known node position, the energy capture power demand values of node, source of radio frequency energy candidate position and energy source number to be arranged, the position and transmission power of energy source are selected using heuritic approach；The algorithm randomly selects the placement position of energy source first, and sends power as the linear programming problem of optimized variable using energy source by solving, and obtains the optimal transmission power of each energy source under present energy sources arrangement；Then iteration, which executes following energy source and arranges, improves operation: successively to each energy source, trial, which changes its position to some current vacant candidate position, always energizes power to reach reduction energy source；The iterative operation is gone to always until can not find more preferably energy source position switching.The method of the invention realizes the Rational choices that source of radio frequency energy position and source of radio frequency energy send power, can reach lesser total energy consumption.
Description
Technical field
The present invention relates to a kind of source of radio frequency energy arrangement and transmitting power setting method, this method is suitable for sensor node
The wireless sensor network of RF energy can be captured.
Background technique
Electromagnetism wave energy is as a kind of ubiquitous, environmentally protective and sustainable energy, increasingly by academia and work
The attention of industry.RF energy capture wireless sense network is exactly the radio frequency energy in a kind of capturing ambient and is converted to electric energy to support
Node continues the new network of sex work.
But at this stage RF energy capture sensor node capturing ambient in radio frequency energy rate still very it is low,
This is one of widely applied bottleneck of such new network.In order to overcome this weakness, deployment-specific source of radio frequency energy is to node
It powers while adjusting energy source transmission power, be a kind of feasible effective method.
Since certain energy can be lost in radio frequency energy in transmission process, i.e. energy source is remoter apart from node, node capture
The radio frequency energy arrived is fewer, and the energy capture power of node depends on the position of energy source.In addition, node often has energy to catch
Power demand values are obtained, such as the value is the average power consumption of node, actual acquisition power exceeds the redundance of requirements, will not
Bring any benefit.Therefore, for known node position, the energy capture power demand values of node, source of radio frequency energy candidate's cloth
The case where seated position and energy source number to be arranged, selects reasonable position in candidate position set,
And the transmission power for the energy source arranged is adjusted, it, for energy minimization, is radio frequency energy that combined optimization, which makes energy source always,
One of the major issue that amount capture network needs to solve.
Summary of the invention
In order to make the wireless sensor network for capturing RF energy reach source of radio frequency energy always for the arrangement mesh of energy minimization
, the present invention according to given node location, the energy capture power demand values of node, source of radio frequency energy candidate position and
The case where energy source number to be arranged, gives a kind of source of radio frequency energy arrangement and transmitting power setting method, come reach compared with
The total consumed power of small network.
The present invention solves technical method used by its technical problem:
A kind of source of radio frequency energy arrangement and transmitting power setting method, the described method comprises the following steps:
Step 1. randomly selects K position on N number of candidate position, then puts on each position picked out
One source of radio frequency energy, wherein K is the number for needing the source of radio frequency energy arranged, with symbol IiWhether to portray in i-th of time
Select one source of radio frequency energy of placement on position: if arranging a source of radio frequency energy at i-th of candidate position,
Then Ii=1, otherwise Ii=0；
Step 2. is the number for capturing the node of RF energy for i=1,2 ..., M and j=1,2 ..., N, M, according to formula
Sub (1) calculates i-th of node SiThe power p that can be captured from the energy source being arranged on j-th candidates positioni,j,
Wherein α is the constant that hardware by energy source and node and environment determine, di,jIt is i-th of node SiWith j-th
The distance between candidate position, PjIndicate that the energy source for being arranged in j-th candidates position sends power；
Step 3. solves total energy supply minimization problem of the K energy source under current position, to obtain this K energy
The respective transmission power in amount source, and calculate total transmission power P of this K energy sourcemin；
Boolean variable a is set as FALSE by step 4.；
K=1 is arranged in step 5.；
N=1 is arranged in step 6.；
K-th of energy source is changed to be arranged into n-th of vacant position candidate by step 7. hypothesis；
Step 8. solves total energy supply minimization problem of the K energy source under current position, to obtain this K energy
The respective transmission power in amount source, and calculate total transmission power P；
If step 9. P < Pmin, then Pmin=P and k-th of energy source is changed to be placed into n-th of vacant position candidate simultaneously
A is set as TRUE；
Step 10.n=n+1 jumps to step 7, otherwise jumps to step 11 if n≤N-K；
Step 11.k=k+1 jumps to step 6, otherwise jumps to step 12 if k≤K；
If step 12. a=TRUE jumps to step 4, otherwise jumps to step 13；
Step 13. terminates.
Further, in the step 3 and step 8, solve K energy source under current position always for energy minimization
Problem the following steps are included:
Step1. I is determined in current position according to K energy source1,I2,…,INValue, i.e., if i-th wait
It selects and arranges a source of radio frequency energy at position, then Ii=1, otherwise Ii=0；
Step2. following linear programming problem: optimized variable is solved using the existing algorithm for solving linear programming problem
It is P1,P2,…,PN, optimization aim is total transmission powerConstraint condition isWith
And 0≤Pn≤Pmax, n=1,2 ..., N, whereinIt is i-th of node SiNeed energy capture power to be achieved, PmaxIt is energy source
Maximum send power.
The invention has the benefit that according to given node location, energy capture power demand values, the RF energy of node
The case where source candidate's position and energy source number to be arranged, determine preferably source of radio frequency energy position and really
The transmission power of fixed each source of radio frequency energy, to reach lesser network total energy consumption.
Detailed description of the invention
Fig. 1 is the flow chart of source of radio frequency energy arrangement and the transmission power plan of establishment of the invention.
Specific embodiment
The present invention will be further described below with reference to the accompanying drawings.
Referring to Fig.1, a kind of source of radio frequency energy arrangement and transmitting power setting method, the section of RF energy is captured according to M
The position of point and N number of source of radio frequency energy candidate position, first calculate i-th of node SiWith j-th candidates position it
Between distance di,j, i=1,2 ..., M and j=1,2 ..., N.
Then the value of α is determined according to the hardware and locating physical environment of energy source and node.
After determining above-mentioned parameter value, according to the energy capture power demand values of nodeI=1,2 ..., M, and
Energy source number K to be arranged executes following steps to determine that preferably source of radio frequency energy position and determination are each penetrated
The transmission power of frequency energy source:
Step 1. randomly selects K position on N number of candidate position, then puts on each position picked out
One source of radio frequency energy, wherein K is the number for needing the source of radio frequency energy arranged, with symbol IiWhether to portray in i-th of time
Select one source of radio frequency energy of placement on position: if arranging a source of radio frequency energy at i-th of candidate position,
Then Ii=1, otherwise Ii=0；
Step 2. is the number for capturing the node of RF energy for i=1,2 ..., M and j=1,2 ..., N, M, according to formula
Sub (1) calculates i-th of node SiThe power p that can be captured from the energy source being arranged on j-th candidates positioni,j,
Wherein α is the constant that hardware by energy source and node and environment determine, di,jIt is i-th of node SiWith j-th
The distance between candidate position, PjIndicate that the energy source for being arranged in j-th candidates position sends power；
Step 3. solves total energy supply minimization problem of the K energy source under current position, to obtain this K energy
The respective transmission power in amount source, and calculate total transmission power P of this K energy sourcemin；
Boolean variable a is set as FALSE by step 4.；
K=1 is arranged in step 5.；
N=1 is arranged in step 6.；
K-th of energy source is changed to be arranged into n-th of vacant position candidate by step 7. hypothesis；
Step 8. solves total energy supply minimization problem of the K energy source under current position, to obtain this K energy
The respective transmission power in amount source, and calculate total transmission power P；
If step 9. P < Pmin, then Pmin=P and k-th of energy source is changed to be placed into n-th of vacant position candidate simultaneously
A is set as TRUE；
Step 10.n=n+1 jumps to step 7, otherwise jumps to step 11 if n≤N-K；
Step 11.k=k+1 jumps to step 6, otherwise jumps to step 12 if k≤K；
If step 12. a=TRUE jumps to step 4, otherwise jumps to step 13；
Step 13. terminates.
In the step 3 and step 8, total energy supply minimization problem packet of the K energy source under current position is solved
Include following steps:
Step2.1. I is determined in current position according to K energy source1,I2,…,INValue, i.e., if at i-th
A source of radio frequency energy is arranged at candidate position, then Ii=1, otherwise Ii=0；
Step2.2. solve following linear programming problem using the existing algorithm for solving linear programming problem: optimization becomes
Amount is P1,P2,…,PN, optimization aim is total transmission powerConstraint condition is
And 0≤Pn≤Pmax, n=1,2 ..., N, whereinIt is i-th of node SiNeed energy capture power to be achieved, PmaxIt is energy
The maximum of source sends power.
Claims (2)
1. a kind of source of radio frequency energy arrangement and transmitting power setting method, which is characterized in that the described method comprises the following steps:
Step 1. randomly selects K position on N number of candidate position, then puts one on each position picked out
Source of radio frequency energy, wherein K is the number for needing the source of radio frequency energy arranged, with symbol IiWhether to portray in i-th of candidate cloth
A source of radio frequency energy is placed in seated position: if arranging a source of radio frequency energy, I at i-th of candidate positioni
=1, otherwise Ii=0；
Step 2. is the number for capturing the node of RF energy for i=1,2 ..., M and j=1,2 ..., N, M, according to formula
(1) i-th of node S is calculatediThe power p that can be captured from the energy source being arranged on j-th candidates positioni,j,
Wherein α is the constant that hardware by energy source and node and environment determine, di,jIt is i-th of node SiAnd j-th candidates
The distance between position, PjIndicate that the energy source for being arranged in j-th candidates position sends power；
Step 3. solves total energy supply minimization problem of the K energy source under current position, to obtain this K energy source
Respective transmission power, and calculate total transmission power P of this K energy sourcemin；
Boolean variable a is set as FALSE by step 4.；
K=1 is arranged in step 5.；
N=1 is arranged in step 6.；
K-th of energy source is changed to be arranged into n-th of vacant position candidate by step 7. hypothesis；
Step 8. solves total energy supply minimization problem of the K energy source under current position, to obtain this K energy source
Respective transmission power, and calculate and total send power P；
If step 9. P < Pmin, then Pmin=P and k-th of energy source is changed to be placed into n-th of vacant position candidate and by a
It is set as TRUE；
Step 10.n=n+1 jumps to step 7, otherwise jumps to step 11 if n≤N-K；
Step 11.k=k+1 jumps to step 6, otherwise jumps to step 12 if k≤K；
If step 12. a=TRUE jumps to step 4, otherwise jumps to step 13；
Step 13. terminates.
2. source of radio frequency energy arrangement as described in claim 1 and transmitting power setting method, it is characterised in that: the step 3
With in step 8, solve total energy supply minimization problem of the K energy source under current position the following steps are included:
Setp1. I is determined in current position according to K energy source1,I2,…,INValue, i.e., if in i-th of candidate cloth
A source of radio frequency energy is arranged at seated position, then Ii=1, otherwise Ii=0；
Step2. solve following linear programming problem using the existing algorithm for solving linear programming problem: optimized variable is P1,
P2,…,PN, optimization aim is total transmission powerConstraint condition isAnd 0
≤Pn≤Pmax, n=1,2 ..., N, whereinIt is i-th of node SiNeed energy capture power to be achieved, PmaxIt is energy source
Maximum sends power.
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