CN104754718B - A kind of frequency selecting method and sensor node of wireless sensor network - Google Patents
A kind of frequency selecting method and sensor node of wireless sensor network Download PDFInfo
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- CN104754718B CN104754718B CN201310745887.2A CN201310745887A CN104754718B CN 104754718 B CN104754718 B CN 104754718B CN 201310745887 A CN201310745887 A CN 201310745887A CN 104754718 B CN104754718 B CN 104754718B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention discloses a kind of frequency selecting method of wireless sensor network and sensor node, this method includes：First sensor node in the wireless sensor network determines the worst worst working frequency of signal quality in beehive network system in N number of working frequency of base station；Determine that the worst working frequency is the working sensor frequency of the first sensor node.Technical solution of the present invention solves in the prior art since wireless sensor network needs to use dedicated frequency, so that the technical issues of radio frequency resources utilization rate is relatively low and wireless sensor network serious interference.
Description
Technical field
The present invention relates to field of communication technology more particularly to the frequency selecting methods and sensing of a kind of wireless sensor network
Device node.
Background technology
Wireless sensor network is current forward position focus research field, is a large amount of sensings by being deployed in monitoring region
Device node forms, and forms the network system of self-organizing, the number of sensor node monitoring between sensor node by radio communication
It is transmitted according to along other sensors node hop-by-hop, management node is reached finally by internet or satellite, to realize sense
Know, acquire and handle the information for being perceived object in network's coverage area, and is sent to observer.
Wireless sensor network mostly uses wireless Ad Hoc technology and carries out networking, but wide with all kinds of wireless communication techniques
General application, existing frequency resource are increasingly exhausted, it is difficult to distribute to the dedicated frequency resource of wireless sensor network.
For example, in the prior art, various countries distribute to the frequency that wireless sensor network uses and belong to industry, science and doctor more
Use frequency range（Industrial Scientific Medical, ISM）Frequency range, and ISM band is Industrial Scientific Medical frequency range,
Belong to without authorizing, need to only abide by certain transmission power can use frequency range, therefore, exist in ISM band a large amount of different
Numerous interference that structure class wireless communication system is formed, have seriously affected the using effect of wireless sensor network.
That is, since existing wireless sensor network needs to use dedicated frequency, so that wireless frequency
Resource utilization is relatively low, and the frequency range that need not be authorized due to that can only be assigned to ISM band etc., causes wireless sensor network dry
It disturbs serious.
Invention content
The embodiment of the present invention provides a kind of frequency selecting method and sensor node of wireless sensor network, to solve
In the prior art due to wireless sensor network need use dedicated frequency so that radio frequency resources utilization rate compared with
The technical issues of low and wireless sensor network serious interference.
Technical solution of the embodiment of the present invention is as follows：
The embodiment of the present invention provides a kind of frequency selecting method of wireless sensor network, and the wireless sensor network is complete
Portion is partially in the coverage area of a beehive network system, and the beehive network system includes K base station, each base station point
With a working frequency, the K base station is corresponding with N number of working frequency, wherein K is more than or equal to N, and N is more than 1, the method packet
Include following step：
First sensor node in the wireless sensor network determines signal quality in N number of working frequency
Worst worst working frequency；
Determine that the worst working frequency is the working sensor frequency of the first sensor node.
From the foregoing, it will be observed that coverage area and a cellular network system of the technical solution of the embodiment of the present invention in wireless sensor network
When system overlapping, sensor node determines the worst frequency of signal quality in the working frequency of the base station of beehive network system
As the working frequency of the sensor node, because using the interference source of the worst frequency of signal quality to the sensor node
Interference is smaller, therefore no longer needs to distribute dedicated frequency to the sensor node, can be achieved with the positive normal open of the sensor node
Letter, to improve the service efficiency of radio frequency resources, further, since wireless sensor network can use cellular network
The working frequency of the base station of system can be reduced to wireless sensor without the frequency range for using ISM band etc. that need not authorize
The interference of network.
Preferably, the first sensor node in the wireless sensor network is determined in N number of working frequency
The worst worst working frequency of signal quality, including；The first sensor node carries out frequency sweep to N number of working frequency,
Receive the N group signals by N number of working frequency transmission；N group parameter informations based on the N groups signal are believed in the N groups
One group of worst worst signal of signal quality is determined in number；Determine that it is described to transmit the corresponding working frequency of the worst signal
Worst working frequency.So as to quickly judge worst working frequency, the effect of sensor node frequency selection is effectively improved
Rate.
Preferably, the N group parameter informations based on the N groups signal, signal quality is determined in the N groups signal
One group of worst worst signal, including：Based on N number of performance number of the N groups signal, power is determined in the N groups signal
It is worth one group of minimum signal as the worst signal.Worst signal is determined by the performance number of N group signals, and then is determined most
Poor working frequency can effectively improve the efficiency of sensor node frequency selection and the accuracy of frequency selection.
Preferably, in the working sensor frequency that the determination worst working frequency is the first sensor node
Later, the method further includes：The first sensor node is with the of the first transmission power and the wireless sensor network
Two sensor nodes are communicated；Wherein, the value of first transmission power meets：Make connecing for the second sensor node
Clever sensitivity is received to produce at the second sensor node more than or equal to the interference source that working frequency is the worst working frequency
Raw signal-to-noise ratio.So as to improve signal-to-noise ratio when transmission data between sensor node, the Successful transmissions of data are realized.
Preferably, in the working sensor frequency that the determination worst working frequency is the first sensor node
Later, the method further includes：The first sensor node is in the second transmission power and the wireless sensor network
Second sensor node is communicated；Wherein, at a distance from the second sensor node is between the first sensor node
Less than one apart from preset value, and the first receiver sensitivity of the first sensor node and the second sensor node
When the sensitivity difference absolute value of the sensitivity difference of second receiver sensitivity is less than a difference preset value, second transmitting
The value of power meets：First receiver sensitivity is set to be more than or equal to the interference that working frequency is the worst working frequency
The signal-to-noise ratio that source generates at the first sensor node.Because the distance between sensor node is much smaller than cellular network system
Distance between base station in system, therefore the transmitting work(of the sensor node is determined based on the disturbed condition of sensor node present position
Rate can not only improve signal-to-noise ratio when transmission data between sensor node, additionally it is possible to improve sensor node and determine its hair
The speed of power is penetrated, and then reduces data transmission delay.
The embodiment of the present invention also provides a kind of sensor node, and the wireless sensor network where the sensor node is complete
Portion is partially in the coverage area of a beehive network system, and the beehive network system includes K base station, each base station point
With a working frequency, the K base station is corresponding with N number of working frequency, wherein K is more than or equal to N, and N is more than 1, the sensor
Node includes：
Determining module, for determining the worst worst working frequency of signal quality in N number of working frequency；
Setup module, for determining the worst working frequency for the working sensor frequency of the first sensor node
Rate.
From the foregoing, it will be observed that coverage area and a cellular network system of the technical solution of the embodiment of the present invention in wireless sensor network
When system overlapping, sensor node determines the worst frequency of signal quality in the working frequency of the base station of beehive network system
As the working frequency of the sensor node, because using the interference source of the worst frequency of signal quality to the sensor node
Interference is smaller, therefore no longer needs to distribute dedicated frequency to the sensor node, can be achieved with the positive normal open of the sensor node
Letter, to improve the service efficiency of radio frequency resources, further, since wireless sensor network can use cellular network
The working frequency of the base station of system can be reduced to wireless sensor without the frequency range for using ISM band etc. that need not authorize
The interference of network.
Preferably, the determining module includes；Frequency sweep unit receives logical for carrying out frequency sweep to N number of working frequency
Cross the N group signals of N number of working frequency transmission；Computing unit is used for the N group parameter informations based on the N groups signal, in institute
State one group of worst signal for determining that signal quality is worst in N group signals；Determination unit transmits the worst signal for determining
Corresponding working frequency is the worst working frequency.So as to quickly judge worst working frequency, biography is effectively improved
The efficiency of sensor node frequency selection.
Preferably, the computing unit is additionally operable to：Based on N number of performance number of the N groups signal, in the N groups signal
Determine one group of signal of performance number minimum as the worst signal.Worst signal is determined by the performance number of N group signals,
And then determine worst working frequency, can effectively improve the selection of sensor node frequency efficiency and frequency selection it is accurate
Degree.
Preferably, the sensor node further includes：First communication module, for the first transmission power with it is described wireless
The second sensor node of sensor network is communicated；Wherein, the value of first transmission power meets：Make described second
The receiver sensitivity of sensor node is more than or equal to the interference source that working frequency is the worst working frequency described second
The signal-to-noise ratio generated at sensor node.So as to improve signal-to-noise ratio when transmission data between sensor node, number is realized
According to Successful transmissions.
Preferably, the sensor node further includes：Second communication module, for the second transmission power with it is described
Second sensor node in wireless sensor network is communicated；Wherein, when the second sensor node and described first
Distance between sensor node is less than one apart from preset value, and the first receiver sensitivity of the first sensor node and institute
The sensitivity difference absolute value for stating the sensitivity difference of the second receiver sensitivity of second sensor node is pre- less than a difference
If when value, the value of second transmission power meets：First receiver sensitivity is set more than or equal to working frequency to be institute
State the signal-to-noise ratio that the interference source of worst working frequency generates at the first sensor node.Because between sensor node
Distance is determined much smaller than distance between base station in beehive network system based on the disturbed condition of sensor node present position
The transmission power of the sensor node can not only improve signal-to-noise ratio when transmission data between sensor node, additionally it is possible to carry
High sensor node determines the speed of its transmission power, and then reduces data transmission delay.
Description of the drawings
Fig. 1 is the frequency selecting method flow diagram of wireless sensor network in the embodiment of the present invention one；
Fig. 2 is the schematic diagram of wireless sensor network and beehive network system in the embodiment of the present invention one；
Fig. 3 is the schematic diagram that is communicated between sensor node in the embodiment of the present invention two；
Fig. 4 is the structural schematic diagram of sensor node in the embodiment of the present invention three；
Fig. 5 is the detailed construction schematic diagram of sensor node in the embodiment of the present invention three；
Fig. 6 is the detailed construction schematic diagram of sensor node in the embodiment of the present invention four.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that the described embodiments are only some of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
In the prior art, wireless sensor network needs to use dedicated frequency, so that radio frequency resources uses
Rate is relatively low, and due to needing dedicated frequency, therefore the frequency range that can only be assigned to ISM band etc. and need not authorize, and causes wirelessly to pass
Sensor network interferences are serious.
It is Chong Die with a beehive network system in the coverage area of wireless sensor network in technical solution of the embodiment of the present invention
When, sensor node is determined that the worst frequency of signal quality is used as and is somebody's turn to do in the working frequency of the base station of beehive network system
The working frequency of sensor node because using the worst frequency of signal quality interference source to the interference of the sensor node compared with
It is small, therefore no longer need to distribute dedicated frequency to the sensor node, the normal communication of the sensor node is can be achieved with, to
The service efficiency of radio frequency resources is improved, further, since wireless sensor network can use beehive network system
The working frequency of base station can be reduced to wireless sensor network without the frequency range for using ISM band etc. that need not authorize
Interference.
With reference to each attached drawing to the main realization principle of technical solution of the embodiment of the present invention, specific implementation mode and its
Advantageous effect corresponding to reach is set forth in.
Embodiment one
The embodiment of the present invention one mainly introduces the determination of the working frequency of wireless sensor node in wireless sensor network
Flow.
The wireless sensor network is completely or partially in the coverage area of a beehive network system, the Cellular Networks
Network system includes K base station, and a working frequency is distributed in each base station, and the K base station is corresponding with N number of working frequency, wherein
K is more than or equal to N, and N is more than 1.
In specific implementation process, which can be global system for mobile communications（Global System
For Mobile Communications, GSM）, wideband code division multiple access（Wideband Code Division Multiple
Access, WCDMA）, long term evolution（Long Term Evolution, LTE）Equal beehive network systems, in the present embodiment not
It enumerates again.
As shown in Figure 1, the frequency selecting method flow chart of the wireless sensor network proposed for the embodiment of the present invention one,
Specific process flow is as follows：
Step 11, the first sensor node in the wireless sensor network is determined in N number of working frequency
The worst worst working frequency of signal quality.
The worst working frequency worst for how to determine signal quality is specific to determine that flow be：Described first
Sensor node carries out frequency sweep to N number of working frequency, receives the N group signals by N number of working frequency transmission；It is based on
The N group parameter informations of the N groups signal determine one group of worst worst signal of signal quality in the N groups signal；It determines
It is the worst working frequency to transmit the corresponding working frequency of the worst signal.
In specific implementation process, above-mentioned parameter information can be any one in the parameters such as power, amplitude, stability or
A variety of combinations.
By N number of working frequency frequency sweep to base station in beehive network system, worst working frequency can be quickly judged,
Effectively improve the efficiency of sensor node frequency selection.
In the present embodiment, it is thus necessary to determine that go out the worst worst working frequency of signal quality, be due to using signal quality
The interference source of worst frequency is relatively minimal to the interference of the sensor node, and when being communicated between sensor node, it does
Signal-to-noise ratio when being mainly reflected in sensor node communication to the interference of sensor node is disturbed, interferes small then signal-to-noise ratio big.And it does
When performance number when disturbing at the noise signal transmission to sensor node in source is smaller, signal-to-noise ratio is relatively large, therefore can be according to biography
The performance number for the signal that sensor node frequency sweep obtains quickly determines worst working frequency.
That is, work(can be determined in the N groups signal based on N number of performance number of the N groups signal of reception
One group of signal of rate value minimum is as the worst signal.Determine that the working frequency for transmitting the worst signal is the worst work
Working frequency.And the voltage value after the size of signal power value need to only be received according to signal can be obtained, therefore according to performance number come really
Fixed worst working frequency can effectively improve the efficiency of sensor node frequency selection and the accuracy of frequency selection.
It is illustrated so that N is equal to 7 as an example below.Referring to FIG. 2, Fig. 2 is wireless sensor in the embodiment of the present invention one
The schematic diagram of network and beehive network system.
As shown in Fig. 2, the sensor node H of wireless sensor network is in the coverage area of a beehive network system,
Each hexagonal honeycomb of the beehive network system uses a frequency, two honeycombs relatively far apart that can use same
Frequency, it is cluster to have used the honeycomb group of whole frequency resources.As shown in Fig. 2, be denoted as A, B, C, D, E, F, G 7 are small
Area is cluster.Assuming that the corresponding working frequency in base station positioned at the center of housing estate position for being denoted as A, B, C, D, E, F, G is followed successively by
a、b、c、d、e、f、g。
To a, b, c, d, e, f, g, this 7 frequencies carry out frequency sweep to sensor node H, receive the frequency that works in beehive network system
Rate is respectively 7 groups of signals that 7 groups of base stations of a, b, c, d, e, f, g are sent out, and analyzes this 7 groups of signals, is extracted respectively
Go out 7 groups of performance numbers of 7 groups of signals.
According to the 7 groups of performance numbers extracted, that group of signal of performance number minimum in 7 groups of signals is determined, it is assumed that with frequency b
The performance number of that group of signal of transmission is minimum, it is determined that frequency b is worst working frequency.
It certainly, can also be by first sensor node and wireless sensing in addition to the method for the worst working frequency of above-mentioned determination
Remaining sensor node in device network is communicated respectively with N number of working frequency, and is calculated and led to respectively under N number of working frequency
N number of signal-to-noise ratio of letter therefore determines that the corresponding working frequency of maximum signal-to-noise ratio is worst work because signal-to-noise ratio then interferes greatly smaller
Working frequency.
Step 12, determine that the worst working frequency is the working sensor frequency of the first sensor node.
By above-mentioned processing procedure as it can be seen that the embodiment of the present invention one proposes the coverage area when wireless sensor network and a bee
When nest network system is overlapped, sensor node determines signal quality most in the working frequency of the base station of beehive network system
Working frequency of the frequency of difference as the sensor node, because using the interference source of the worst frequency of signal quality to the sensing
The interference of device node is smaller, therefore no longer needs to distribute dedicated frequency to the sensor node, can be achieved with the sensor node
Normal communication, to improve the service efficiency of radio frequency resources, further, since wireless sensor network can use
The working frequency of the base station of beehive network system can be reduced to nothing without the frequency range for using ISM band etc. that need not authorize
The interference of line sensor network.
Embodiment two
After the method that through the embodiment of the present invention one proposes determines the working frequency of sensor node, it is ensured that sensing
The high-quality transmission of device internodal data increases signal-to-noise ratio, it is also necessary to determine transmission power when communication between sensor node.
It is mainly introduced in embodiment two, after sensor node determines working sensor frequency, with wireless sensor network
When remaining sensor node in network is communicated, the flow of transmission power is determined.
Referring to FIG. 3, Fig. 3 is the schematic diagram communicated between sensor node in embodiment two.
In the embodiment of the present invention two, the communication between sensor node can be divided into compared between remote pickup node
Communication and closer distance sensor node between communication.The transmission power introduced separately below under both of these case determines
Scheme,
Situation 1, compared with the communication between remote pickup node.
The first sensor node is with the second sensor node of the first transmission power and the wireless sensor network
It is communicated；Wherein, the value of first transmission power meets：Keep the receiver sensitivity of the second sensor node big
In the signal-to-noise ratio generated at the second sensor node equal to the interference source that working frequency is the worst working frequency.
As shown in Figure 3, it is assumed that the distance between first sensor node Y and second sensor nodes X are compared to Cellular Networks
Distance between the base station of network system be can not ignore, then in order to enable second sensor nodes X receive first sensor node Y with
The signal that frequency a is sent, it is necessary to which the receiver sensitivity of second sensor nodes X is more than the interference source that frequency is a second
The noise generated at sensor node X.
Require RS2≥SNR2, wherein RS2For the receiver sensitivity of second sensor nodes X, SNR2It is a for frequency
The noise that is generated at second sensor nodes X of interference source.AndWherein, S is first sensor node
Y is sent to the mean power of the signal of second sensor nodes X, Z be frequency be a interference source at second sensor nodes X
Noise signal mean power.
It is directly proportional to transmission power since the decaying of frequency and distance square are inversely proportional signal in transmission process, thereforeWherein, PYFor the tranmitting frequency of first sensor node Y, d is first sensor node Y and second
The distance between sensor node X.That is, when first sensor node Y is communicated with second sensor nodes X, the
The transmission power P of one sensor node YYIt needs to meetIt can improve and transmit between sensor node
Signal-to-noise ratio when signal realizes the Successful transmissions of signal.
In formulaIn, RS2For second sensor nodes X just known fixed ginseng is completed from manufacture
Number；Average distance values of the d between sensor node is empirical value；The acquisition of Z can received by second sensor nodes X
Before signal, to frequency a frequency sweeps, the noise signal for the interference source transmission that receives frequency is a, and extract the average work(of noise signal
Rate Z.First sensor node Y first sends a request signal and causes institute before transmission data signal to the second sensor nodes X
The management node for stating sensor network, to obtain the Z and RS that the second sensor nodes X is uploaded to management node2, further according to
RS1, d and D value, pass through formulaFast and accurately calculate the transmitting of first sensor node Y
Power PYValue range.
Communication between situation 2, closer distance sensor node.
In general, in wireless sensor network, sensor node can be by neighbouring other sensors node come multi-hop
Realize the transmission of signal, therefore the distance between sensor node communicated is closer, compared to the base of beehive network system
Distance between standing can almost be ignored, and the receiver sensitivity of sensor node is fixed value, therefore in order to realize sensor section
When point externally transmits signal, transmission power can be quickly determined, it, can when first sensor sends a signal to second sensor
Directly to determine transmission power according to the disturbed condition at first sensor.
That is, the first sensor node is with second in the second transmission power and the wireless sensor network
Sensor node is communicated；Wherein, when being less than at a distance from the second sensor node is between the first sensor node
One apart from preset value, and the first receiver sensitivity of the first sensor node and the second of the second sensor node
When the sensitivity difference absolute value of the sensitivity difference of receiver sensitivity is less than a difference preset value, second transmission power
Value meet：Make first receiver sensitivity be more than or equal to the interference source that working frequency is the worst working frequency to exist
The signal-to-noise ratio generated at the first sensor node.
It equally please refers to Fig.3, it is assumed that the distance between first sensor node Y and second sensor nodes X are compared to bee
Distance between the base station of nest network system can be ignored, and first sensor node Y and the reception of second sensor nodes X are clever
Sensitivity is almost equal, then in order to enable second sensor nodes X to receive the signal that first sensor node Y is sent with frequency a,
It only needs the receiver sensitivity of first sensor node Y to be more than the interference source that frequency is a to generate at first sensor node Y
Noise.
Require RS1≥SNR1, wherein RS1For the receiver sensitivity of first sensor node Y, SNR1It is a for frequency
The noise that is generated at first sensor node Y of interference source.AndWherein, S is first sensor node
Y is sent to the mean power of the signal of second sensor nodes X, D be frequency be a interference source at first sensor node Y
Noise signal mean power.
It is directly proportional to transmission power since the decaying of frequency and distance square are inversely proportional signal in transmission process, thereforeWherein, PYFor the tranmitting frequency of first sensor node Y, d is first sensor node Y and second
The distance between sensor node X.That is, when first sensor node Y is communicated with second sensor nodes X, the
The transmission power P of one sensor node YYIt needs to meetIt can improve and transmit between sensor node
Signal-to-noise ratio when signal realizes the Successful transmissions of signal.
In formulaIn, RS1For first sensor node Y just known fixed ginseng is completed from manufacture
Number；Average distance values of the d between sensor node is empirical value；The acquisition of D can be by first sensor node with frequency
Before a sends signal, to frequency a frequency sweeps, the noise signal for the interference source transmission that receives frequency is a, and extract noise signal
Mean power D.RS is obtained in first sensor node Y1, d and D value after, formula can be passed throughFast and accurately calculate the transmission power P of first sensor node YYValue range.
Because the communication between most of sensor nodes is the communication mode that the above situation 2 provides, at this point, direct basis
Disturbed condition at first sensor determines transmission power, without sending asks that management node is caused to obtain at second sensor
Disturbed condition, signal-to-noise ratio when transmission data between sensor node can not only be improved, additionally it is possible to improve sensor node
It determines the speed of its transmission power, and then reduces data transmission delay.
Embodiment three
It is corresponding with the frequency selecting method of wireless sensor network that the embodiment of the present invention one provides, the embodiment of the present invention three
A kind of sensor node is provided, the wireless sensor network where the sensor node is completely or partially in a cellular network
In the coverage area of system, the beehive network system includes K base station, and a working frequency is distributed in each base station, and the K is a
Base station is corresponding with N number of working frequency, wherein K is more than or equal to N, and N is more than 1, and structure is as shown in figure 4, include：
Determining module 41, for determining the worst worst working frequency of signal quality in N number of working frequency；
Setup module 42, for determining the worst working frequency for the working sensor frequency of the first sensor node
Rate.
Referring to FIG. 5, Fig. 5 is the detailed structure view of sensor node in the embodiment of the present invention three；
As shown in Figure 5, it is preferred that the determining module 41 includes；Frequency sweep unit 51, for N number of working frequency
Frequency sweep is carried out, the N group signals by N number of working frequency transmission are received；Computing unit 52, for being based on the N groups signal
N group parameter informations, one group of worst worst signal of signal quality is determined in the N groups signal；Determination unit 53, is used for
Determine that it is the worst working frequency to transmit the corresponding working frequency of the worst signal.
Preferably, the computing unit 52 is additionally operable to：Based on N number of performance number of the N groups signal, in the N groups signal
In determine one group of signal of performance number minimum as the worst signal.
The sensor node provided in the present embodiment and the method in embodiment one, are based on two under same inventive concept
A aspect is in front described in detail the implementation process of method, so those skilled in the art can be according to aforementioned
Description is apparent from the structure and implementation process of the sensor node in the present embodiment, in order to illustrate the succinct of book, herein
It repeats no more.
Example IV
Determine that method is corresponding with the transmission power of wireless sensor provided by Embodiment 2 of the present invention, the embodiment of the present invention four
The determining module 41 provided in a kind of sensor node, including embodiment one and setup module 42 are provided, referring to FIG. 6, Fig. 6 is
The detailed structure view of sensor node in the embodiment of the present invention four；
As shown in fig. 6, further including：
First communication module 61, for the second sensor node of the first transmission power and the wireless sensor network
It is communicated；Wherein, the value of first transmission power meets：Keep the receiver sensitivity of the second sensor node big
In the signal-to-noise ratio generated at the second sensor node equal to the interference source that working frequency is the worst working frequency.
Preferably, the sensor node further includes：Second communication module 62, for the second transmission power and the nothing
Second sensor node in line sensor network is communicated；Wherein, when the second sensor node and described first pass
Distance between sensor node is less than one apart from preset value, and the first receiver sensitivity of the first sensor node with it is described
The sensitivity difference absolute value of the sensitivity difference of second receiver sensitivity of second sensor node is default less than a difference
When value, the value of second transmission power meets：First receiver sensitivity is set more than or equal to working frequency to be described
The signal-to-noise ratio that the interference source of worst working frequency generates at the first sensor node.
The sensor node provided in the present embodiment and the method in embodiment two, are based on two under same inventive concept
A aspect is in front described in detail the implementation process of method, so those skilled in the art can be according to aforementioned
Description is apparent from the structure and implementation process of the sensor node in the present embodiment, in order to illustrate the succinct of book, herein
It repeats no more.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of frequency selecting method of wireless sensor network, which is characterized in that the wireless sensor network whole or portion
Divide in the coverage area in a beehive network system, the beehive network system includes K base station, and each base station distributes one
Working frequency, the K base station are corresponding with N number of working frequency, wherein and K is more than or equal to N, and N is more than 1, the method includes：
First sensor node in the wireless sensor network determines that signal quality is worst in N number of working frequency
Worst working frequency；
Determine that the worst working frequency is the working sensor frequency of the first sensor node.
2. the method as described in claim 1, which is characterized in that the first sensor node in the wireless sensor network exists
The worst worst working frequency of signal quality is determined in N number of working frequency, including：
The first sensor node carries out frequency sweep to N number of working frequency, receives through N number of working frequency transmission
N group signals；
N group parameter informations based on the N groups signal determine that signal quality worst one group is worst in the N groups signal
Signal；
Determine that it is the worst working frequency to transmit the corresponding working frequency of the worst signal.
3. method as claimed in claim 2, which is characterized in that the N group parameter informations based on the N groups signal, in institute
One group of worst signal for determining that signal quality is worst in N group signals is stated, including：
Based on N number of performance number of the N groups signal, one group of signal conduct of performance number minimum is determined in the N groups signal
The worst signal.
4. the method as described in claim 1, which is characterized in that passed for described first in the determination worst working frequency
After the working sensor frequency of sensor node, the method further includes：
The first sensor node is carried out with the second sensor node of the first transmission power and the wireless sensor network
Communication；
Wherein, the value of first transmission power meets：Make the second sensor node receiver sensitivity be more than etc.
In the signal-to-noise ratio that the interference source that working frequency is the worst working frequency generates at the second sensor node.
5. the method as described in claim 1, which is characterized in that passed for described first in the determination worst working frequency
After the working sensor frequency of sensor node, the method further includes：
The first sensor node with the second sensor node in the second transmission power and the wireless sensor network into
Row communication；
Wherein, when being less than one at a distance from the second sensor node is between the first sensor node apart from preset value, and
First receiver sensitivity of the first sensor node and the second receiver sensitivity of the second sensor node
When the sensitivity difference absolute value of sensitivity difference is less than a difference preset value, the value of second transmission power meets：Make
First receiver sensitivity is more than or equal to the interference source that working frequency is the worst working frequency and is sensed described first
The signal-to-noise ratio generated at device node.
6. a kind of sensor node, which is characterized in that the wireless sensor network where the sensor node is all or part of
In coverage area in a beehive network system, the beehive network system includes K base station, and a work is distributed in each base station
Working frequency, the K base station are corresponding with N number of working frequency, wherein K is more than or equal to N, and N is more than 1, the sensor node packet
It includes：
Determining module, for determining the worst worst working frequency of signal quality in N number of working frequency；
Setup module, for determining that the worst working frequency is the working sensor frequency of first sensor node, wherein institute
It is the sensor node in the wireless sensor network to state first sensor node.
7. sensor node as claimed in claim 6, which is characterized in that the determining module includes；
Frequency sweep unit receives and is believed by the N groups of N number of working frequency transmission for carrying out frequency sweep to N number of working frequency
Number；
Computing unit is used for the N group parameter informations based on the N groups signal, determines signal quality most in the N groups signal
One group of worst signal of difference；
Determination unit, for determining that it is the worst working frequency to transmit the corresponding working frequency of the worst signal.
8. sensor node as claimed in claim 7, which is characterized in that the computing unit is additionally operable to：
Based on N number of performance number of the N groups signal, one group of signal conduct of performance number minimum is determined in the N groups signal
The worst signal.
9. sensor node as claimed in claim 6, which is characterized in that the sensor node further includes：
First communication module, for being led to the first transmission power and the second sensor node of the wireless sensor network
Letter；
Wherein, the value of first transmission power meets：Make the second sensor node receiver sensitivity be more than etc.
In the signal-to-noise ratio that the interference source that working frequency is the worst working frequency generates at the second sensor node.
10. sensor node as claimed in claim 6, which is characterized in that the sensor node further includes：
Second communication module, for being carried out with the second sensor node in the second transmission power and the wireless sensor network
Communication；
Wherein, when being less than one at a distance from the second sensor node is between the first sensor node apart from preset value, and
First receiver sensitivity of the first sensor node and the second receiver sensitivity of the second sensor node
When the sensitivity difference absolute value of sensitivity difference is less than a difference preset value, the value of second transmission power meets：Make
First receiver sensitivity is more than or equal to the interference source that working frequency is the worst working frequency and is sensed described first
The signal-to-noise ratio generated at device node.
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