CN105979565A - Wireless sensor network based on dynamic routing mechanism, and topology control method for wireless sensor network - Google Patents
Wireless sensor network based on dynamic routing mechanism, and topology control method for wireless sensor network Download PDFInfo
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- CN105979565A CN105979565A CN201610312888.1A CN201610312888A CN105979565A CN 105979565 A CN105979565 A CN 105979565A CN 201610312888 A CN201610312888 A CN 201610312888A CN 105979565 A CN105979565 A CN 105979565A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/248—Connectivity information update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/021—Ensuring consistency of routing table updates, e.g. by using epoch numbers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/28—Connectivity information management, e.g. connectivity discovery or connectivity update for reactive routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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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 provides a wireless sensor network based on a dynamic routing mechanism, and a topology control method for the wireless sensor network. The wireless sensor network consists of a sensor node, a convergence node, and upper computer software. The method mainly comprises three steps: firstly building network topology through the dynamic routing mechanism; secondly carrying out estimation according to RSSI and LQI indexes, and then adjusting the emission power of the sensor node; and finally carrying out the maintenance of the structure of the network topology, thereby guaranteeing the connectivity and reliability of the network. The method based on power control can reduce the interference among signals, improves the stability of the network, and prolongs the life cycle of the network.
Description
Technical field
The invention belongs to the technical field of wireless sensor network, relate to a kind of based on Dynamic routing mechanisms
Wireless sensor network and topology control method.
Background technology
Wireless sensor network is by a large amount of cheap microsensor node group being deployed in monitored area
Become, formed the network system of a kind of multi-hop ad hoc by communication, it is possible to be real by cooperation
Time monitoring, perception and collection network distribution region in various environmental informations, and these information are carried out
Process, thus obtain detailed and information accurately.The application prospect of wireless sensor network is boundless,
National defense and military, environmental monitoring, health care, traffic administration and space exploration can be widely used in
In field.Network topology control refers to, on the premise of meeting network coverage and degree of communication, pass through merit
Rate controls and backbone node selects, and rejects wireless communication link unnecessary between node, generates one
Efficient data forward network topology structure.The appropriate design of network topology and optimization are to improving internetworking
Can be particularly important, it is embodied in the following aspects:
1. reduce sensor node energy consumption, extend whole Network morals.Along with integrated circuit work
The progress of skill, the processor of sensor node and the power consumption of sensor assembly become the lowest, the overwhelming majority
Energy expenditure is on wireless communication module, and node generally uses the battery of finite energy to power, more
Change or charge the battery the most relatively difficult to achieve.Topology controls sending out by self-adaptative adjustment sensor node
Penetrate power, make the lower power consumption of node, extend the life span of network.
2. reduce sensor node Communication Jamming, improve communication efficiency.Wireless sensor network interior joint
Distribution density is bigger, if each node is with maximum transmitting power transmission data, can aggravate to lead to
The interference of letter channel, the increasing bit error rate, the efficiency of reduction network service, cause the waste of node energy.
Whereas if the transmitting power of node is too small, influencing whether the connectedness of network, lost part senses
Data.The power control techniques of network topology control can effectively solve this problem.
3. topology controls to provide basis for Routing Protocol.Routing Protocol is it is to be appreciated that the topology of network is tied
Structure, only effective node just can carry out data transmission and forward.Topology controls to improve MAC
Agreement and the efficiency of Routing Protocol, provide underlying topology for data fusion.
Sensor node in wireless sensor network mostly uses battery to power and power supply can not be more
Change, supplement, so its primary goal is to use the energy efficiently owing to lacking lasting, the stable energy
Extend Network morals substantially.In actual application, all of sensor node with
Maximum transmitting power communicates, although ensure that the connectedness of network topology, but inevitably
Cause the waste of energy, also result in signal conflict simultaneously, so that the life span of network becomes
Short.Network topology control can optimize network topology structure, improves sensor node energy utilization rate,
Extend Network morals.
Summary of the invention
The present invention provides a kind of wireless sensor network based on Dynamic routing mechanisms, sensor save
Point, aggregation node and upper computer software three part composition, sensor node periodically wakes up, and adopts
Collection environmental data is also uploaded to aggregation node by the wireless signal of 2.4GHz, and sensor node has
Data acquisition, data transmission, route forwarding function；Aggregation node passes through wired or WiFi or GPRS
Each nodal information collected is uploaded to local PC and remote data center by wireless mode, converges
Node is for the data summarization of sensor node, as the father node of all the sensors node, also simultaneously
There is the function issuing networking command；Upper computer software is for processing the data message of aggregation node, in order to
The real-time monitoring network of observer；The upper computer software of local PC and remote data center issues life
Order and network node carry out that information revises the net dormancy cycle alternately, node restarts function.
The present invention also provides for a kind of wireless sensor network topology control method based on dynamic routing, first
First pass through dynamic routing and set up tree network topology, secondly according to RSSI and LQI index, channel is entered
Adjusting the transmitting power of node after row assessment, power enters network topology maintenance phase after adjusting,
Periodically survey topology of networks, it is ensured that the connectedness of network and reliability.By dynamically
Adjust the transmitting power of sensor node, make sensor node communicate with suitably transmitting power,
It is possible not only to ensure the connectedness of network, it is also possible to be effectively reduced the power consumption of node, thus reach to prolong
The purpose of long network lifecycle.
Wireless sensor network topology control method based on Dynamic routing mechanisms comprises the steps of:
Step 1: native system uses Dynamic routing mechanisms to build network topology structure, and dynamic routing is logical
Cross the information constantly exchanged between node each other, according to the pathfinding effect that specific algorithms selection is optimum
Really, the network being continually changing can also be adapted to simultaneously, adjust topology of networks dynamically.
The flow process of topology constructing is: a node adds network, first can when there being data to need and send
Check routing table, if routing table does not exist any routing iinformation, then this node can send one
Broadcast route request.Other node is receiving this node route request when, if self has properly
Routing iinformation then routing iinformation can be replied to requesting node.Requesting node is receiving response when
Can go to update the information of routing table, to ensure that the information of routing table is up-to-date.Wherein update routing table
It is part crucial in dynamic routing protocol, can first travel through when receiving a new routing iinformation
Routing table, checks the most whether there is the table that the node number comprised in new routing iinformation is identical
?.If there is such list item, illustrate that this list item has been older, so with receiving
To new routing iinformation cover this older list item.If it find that do not deposit after having traveled through routing table
At the list item that node number is identical, there is not such routing iinformation before explanation, then this route letter
Breath must join in routing table and this information be joined in routing table.If there is routing table
Through full situation, now system can cover, with new routing iinformation, the route table items being worth least.Often
Individual node all can build a routing table, when node sends data when, can choose from routing table
Data are sent by the route table items that jumping figure is minimum and link-quality is best.
Step 2: after topological structure has built, the system meeting ingoing power metamorphosis stage, self adaptation
Ground adjusts the transmitting power of each node so that it is in the case of ensureing that data are correctly transmitted, fall as far as possible
The low each node power consumption when data are transmitted.One routing table information of each node maintenance, passes through
Function getRouteStatus () obtains the routing state information between node and its father node, uses
RSSI (Receive Signal Strength Indicator) and LQI (Link in routing iinformation
Quality Indicator) index carries out classification to radio communication channel, and one is divided into five ranks,
They are VERYGOOD, GOOD, PERFECT, BAD and VERYBAD respectively.When being rated of channel
Show during VERYGOOD and GOOD that channel quality is fine, can suitably reduce the transmitting power of node,
Reduce the communication power consumption of node；When channel is rated other ranks, node still uses the transmitting of maximum
Power, it is ensured that the connectedness of network and reliability.
Step 3: when sensor node completes to communicate with suitably transmitting power after power adjusts,
System enters topology maintenance phase.Due to sensor node needed gather data, process data and
The tasks such as transmission data, are required for consumed energy, and therefore network topology state is it may happen that change, because of
This needs to be maintained to make it keep optimum state.
The maintenance of network topology is periodic task, uses intervalometer to trigger.The length of timing cycle
The most crucial, the time is the shortest may cause unnecessary maintenance costs.On the other hand, the time oversize can
Node failure can be caused, it is impossible to transmission data due to network topology structure change.System needs the cycle
Property ground check the change of network topology structure, according to the change of network topology, suitably adjust sending out of node
Penetrate power.The situation that topology is safeguarded is more complicated, and the mode that power adjusts is the most different.One node
Father node lost efficacy after, it needs to increase the power of launching of self and strengthens the scope of communication, again finds
New route.Affected channel quality by environment drastically to decline, it is also desirable to node strengthens launches power
Ensure the reliability of communication.New node adds network, and the communication distance between node shortens, and needs
Suitably reduce the transmitting power of node, to adapt to new network topology.
The invention has the beneficial effects as follows:
1, the method that the present invention proposes is possible not only to efficiently control the transmitting power of node, reduces joint
The power consumption of point, extends Network morals, but also can reduce the Communication Jamming between node,
Improve the accuracy of data transmission；
2, the method that the present invention proposes is applicable to computing capability and the limited sensor node of communication capacity,
The foundation that power adjusts is LQI and RSSI, and these indexs have only to read the value of depositor and just can obtain
Take, reduce the algorithm expense that power adjusts；
What 3, the method that the present invention proposes proposed has adaptive ability, periodically surveys network
The change of topological structure, dynamically adjusts the transmitting power of sensor node, it is ensured that sensor node is to close
Suitable transmitting power work.
Accompanying drawing explanation
Describe in detail such as below in conjunction with embodiment and accompanying drawing for further illustrating the technology contents of the present invention
After, wherein:
Fig. 1 is sensor node various duty power consumption profile figure；
Fig. 2 is the tree network topology structure chart that wireless sensor network is formed；
Fig. 3 is the flow chart that dynamic routing builds topological structure；
Fig. 4 is that sensor node adjusts transmitting power flow figure；
Fig. 5 is wireless sensor network system structural representation.
Description of reference numerals:
1 aggregation node 2-10 sensor node
Detailed description of the invention
The specific embodiment of wireless sensor network based on Dynamic routing mechanisms in a kind of present invention.Should
System is mainly by sensor node, aggregation node (gateway) and upper computer software three part composition.
System structure schematic diagram, as it is shown in figure 5, sensor node periodically wakes up, gathers environmental data also
Being uploaded to aggregation node by the wireless signal of 2.4GHz, sensor node has data acquisition, number
According to transmission, route forwarding function；Aggregation node will be adopted by wired or WiFi or GPRS wireless mode
Collect to each nodal information be uploaded to local PC and remote data center, aggregation node is used for sensing
The data summarization of device node, as the father node of all the sensors node, the most also issues network life
The function of order；Upper computer software is for processing the data message of aggregation node, in order to observer supervises in real time
Control network data；Local PC and the upper computer software transmitting order to lower levels of remote data center and network node
The information of carrying out revises the net dormancy cycle alternately, node restarts function.
The nucleus module of sensor node uses the CC2530 chip of TI company, and this module realizes radio frequency
Transmitting-receiving, storage control and perform the function controlled.Sensor node is generally made up of 4 big functional modules,
I.e. power module, sensor assembly, processor module, wireless communication module, and power module is adopted
Power with battery and be difficult to change.Along with the progress of integrated circuit technology, the processor of sensor node
Becoming the lowest with the power consumption of sensor assembly, overwhelming majority energy expenditure is on wireless communication module.Nothing
There are transmission, reception, idle and four kinds of states of sleep in line communication module, saves under different duties
The power consumption of point is different.In a sleep state, radio-frequency module is closed, and only processor module is in work,
The energy that node consumes is the least.In receive state, node needs to intercept aerial radiofrequency signal, because of
The power consumption of this node substantially increases, and idle condition and reception state energy consume close.In the state of transmission
Under, owing to radio-frequency module is very big at the operating current sending moment, and node circuit is by electric capacity, electricity
The joint effect of the energy-storage travelling wave tubes such as sense, the power consumption of node is maximum in all states.Sensor node
Ratio more consumed energy when performing to calculate during transmission data, distance 100m transmits 1 Bit data need
The energy wanted is about as much as and performs the energy that 3000 computationses consume.
The sensor node each several part Energy Expenditure Levels that Fig. 1 describes.The transmitting power reducing node can
Effectively reduce the power consumption of node, extend the life cycle of whole wireless sensor network.
The core concept of the Topology Control Algorithm that this patent proposes is to set up tree by dynamic routing protocol
L network topological structure, the topological structure of wireless sensor network be typically tree structure as in figure 2 it is shown,
Grading communication channel between node according to routing iinformation, the index that grading is used includes RSSI
And LQI, dynamically adjust the transmitting power of sensor node finally according to the result graded, make node
Suitably to launch power work, it is to avoid the waste of energy.Aggregation node saves as the root of whole network
Point, the data of network collection the most all will be transmitted to aggregation node.Sensor node is not only data acquisition
Collection node, is the most also route via node.The data of collection are sent to oneself by sensor node
Father node, also forwards the data that other nodes send simultaneously, and data are eventually through forwarding transmission layer by layer extremely
Aggregation node.
Power control algorithm is specifically divided into three steps, and they are that topological structure builds stage, merit respectively
Rate metamorphosis stage and topology maintenance phase.
1) the topology constructing stage
The flow process of topology constructing is as shown in Figure 3.System uses Dynamic routing mechanisms to build network topology knot
Structure, dynamic routing is by constantly exchanging information each other between node, selecting according to specific algorithm
Select the pathfinding effect of optimum, the network being continually changing can also be adapted to simultaneously, dynamic adjustment network
Topological structure.One node adds network, first can check routing table when there being data to need and send,
If routing table does not exist any routing iinformation, then this node can send a broadcast please
Ask.Other node is receiving this node route request when, if self there being suitable routing iinformation
Then routing iinformation can be replied to requesting node.Requesting node can go to update road receiving response when
By the information of table, to ensure that the information of routing table is up-to-date.Wherein updating routing table is dynamic routing
First part crucial in agreement, can travel through routing table when receiving a new routing iinformation, inspection
Look into and the most whether there is the list item that the node number comprised in new routing iinformation is identical.If deposited
At such list item, illustrate that this list item has been older, so with the new road received
This older list item is covered by information.If it find that there is not node number phase after having traveled through routing table
, there is not such routing iinformation before explanation, then this routing iinformation must add in same list item
Enter in routing table and this information is joined in routing table.If there is the feelings that routing table is the fullest
Condition, now system can cover, with new routing iinformation, the route table items being worth least.Each node
A routing table can be built, when node sends data when, jumping figure can be chosen from routing table minimum
And data are sent by the best route table items of link-quality.
2) the power metamorphosis stage
The flow process that power adjusts is as shown in Figure 4.After topological structure has built, system can enter merit
The rate metamorphosis stage, it is adaptively adjusted the transmitting power of each node so that it is ensureing that data correctly pass
In the case of defeated, reduce each node power consumption when data are transmitted as far as possible.By obtaining routing state
Judge whether legal routing iinformation, do not exist, update routing table.When there is legal route,
One routing table information of each node maintenance, by function getRouteStatus obtain node with
Routing state information between its father node, in use routing iinformation, RSSI and LQI index is to wireless
Communication channel carries out classification, and one is divided into five ranks, they be respectively VERYGOOD, GOOD,
PERFECT, BAD and VERYBAD.Channel is shown when being rated VERYGOOD and GOOD when channel
Quality is fine, can suitably reduce the transmitting power of node, reduces the communication power consumption of node；Work as channel
When being rated other ranks, node still use maximum transmitting power, it is ensured that the connectedness of network with can
By property.Repeat this process and the most finally determine the transmitting power of sensor node.
The index that channel grading is used is RSSI and LQI, and they reflect the state of communication channel.
RSSI is the mode weighed and receive RF signal power, has and read RSSI specially in CC2530 chip
The depositor of value, after packet receives, the coprocessor in CC2530 chip is by this packet
RSSI value write depositor.The conversion relation of RSSI value and received signal power Pr is as follows:
Pr=RSSI_VAL+RSSI_OFFSET [dBm]
Wherein, RSSI_OFFSET is empirical value, typically takes-45, in the feelings that transmitting-receiving node distance is fixing
Under condition, RSSI value increases with launching power linear.LQI reflects the link-quality of channel, and expression connects
Receive the energy of Frame and quality, its size based on signal intensity and the signal to noise ratio (SNR) that detects,
Relevant with the probability having correctly received Frame under normal circumstances.The LQI dynamic range relative to RSSI
Bigger, and have higher resolution, but the response speed of RSSI is faster than LQI, so RSSI
The state change of network can be reflected faster.Network is assessed in conjunction with RSSI and LQI two indices
State can accomplish accurately and quickly, it is ensured that power adjust accuracy and effectiveness.
The method launching power adjustment realizes being by RfConfigP in amendment TinyOS operating system
Assembly, this assembly is responsible for the configuration of radio-frequency module parameter, is used variable m_tx_power to control to send out
Penetrate the grade of power, achieve gainTXPower () and two functions of reduceTXPower () respectively,
It is used for adjusting the transmitting power of radio-frequency module.CC2530 radio frequency chip supports 16 emitting power grades,
Maximum transmission power is 4.5dBm, and minimum emissive power is-22dBm.Can be by software to CC2530
TXPOWER depositor be configured, reach to arrange the purpose launching power.When mid frequency is arranged
During for 2.440GHz, typical output power and current drain that TXPOWER is arranged are as shown in table 1 below.
Table 1
Being implemented as follows of power control function:
The transmitting power of // increase node
command void RfConfig.gainTXPower()
{
If (m_tx_power==0xF5)
return；
M_tx_power+=16；
writeTxPower()；
}
The transmitting power of // reduction node
command void RfConfig.reduceTXPower()
{
If (m_tx_power==0x05)
return；
M_tx_power-=16；
writeTxPower()；
}
3) topology maintenance phase
When sensor node completes to communicate with suitably transmitting power after power adjusts, and system enters
Topology maintenance phase.Owing to sensor node has needed to gather data, process data and transmission data
Etc. task, being required for consumed energy, therefore network topology state is it may happen that change, it is therefore desirable to right
It carries out maintenance makes it keep optimum state.The maintenance of network topology is periodic task, and it is fixed to use
Time device trigger.The length of timing cycle is the most crucial, and the time is the shortest may cause unnecessary maintenance to be opened
Pin.On the other hand, the time oversize may due to network topology structure change cause node failure, nothing
Method transmission data.System needs to periodically survey the change of network topology structure, according to network topology
Change, suitably adjust the transmitting power of node.The situation that topology is safeguarded is more complicated, and power adjusts
Mode the most different.After the father node of one node lost efficacy, it needs to increase the transmitting power of self
Strengthen the scope of communication, again find new route.Affected channel quality by environment drastically to decline,
It is also required to node and strengthens the reliability launching power assurance communication.New node adds network, node it
Between communication distance shorten, need suitably to reduce the transmitting power of node, to adapt to new network topology.
Particular embodiments described above, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the foregoing is only the present invention specific embodiment and
, be not limited to the present invention, all within the spirit and principles in the present invention, that is done any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a wireless sensor network based on Dynamic routing mechanisms, by sensor node, converges joint
Point and upper computer software three part composition, sensor node periodically wakes up, and gathers environmental data
And be uploaded to aggregation node by the wireless signal of 2.4GHz, sensor node have data acquisition,
Data transmission, route forwarding function；Aggregation node is incited somebody to action by wired or WiFi or GPRS wireless mode
Each nodal information collected is uploaded to local PC and remote data center, and aggregation node is used for passing
The data summarization of sensor node, as the father node of all the sensors node, the most also issues network
The function of order；Upper computer software is for processing the data message of aggregation node, in order to observer is real-time
Monitoring network；The upper computer software transmitting order to lower levels of local PC and remote data center saves with network
Point carries out that information revises the net dormancy cycle alternately, node restarts function.
2. wireless sensor network based on Dynamic routing mechanisms as claimed in claim 1, its feature
Being, wherein said sensor node is by power module, sensor assembly, processor module, wireless
Communication module and big functional module composition.
3. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 1
Method processed, comprises the steps:
1) topological structure builds the stage: use Dynamic routing mechanisms to build network topology structure, dynamically
Routing mechanism is by constantly exchanging information each other between sensor node, according to specific algorithm
Select optimum pathfinding effect, adapt to the network being continually changing simultaneously, the dynamic topology adjusting network
Structure；
2) the power metamorphosis stage: be adaptively adjusted the transmitting power of each sensor node so that it is
In the case of ensure that data correctly transmit, reduce each sensor node when data are transmitted as far as possible
Power consumption；
3) topology maintenance phase: when sensor node completes after power adjusts suitably to launch power
Communicating, system enters topology maintenance phase, and the maintenance of network topology is periodic task, adopts
Trigger with intervalometer.
4. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 3
Method processed, it is characterised in that wherein described 2) the power metamorphosis stage, according to the road between node
By information, the channel between communication node is graded, then according to the rating result of channel dynamically
Adjust the transmitting power of node, make node suitably to launch power work, it is to avoid the waste of energy.
5. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 4
Method processed, it is characterised in that the method for wherein said communication channel grading is, according to dynamic routing machine
Network topology constructed by system obtains LQI and the RSSI information between communication node, comments as channel
The index that used of level, is divided into 5 grades by channel, be respectively VERYGOOD, GOOD, PERFECT,
BAD and VERYBAD, wherein RSSI is to weigh the mode of RF signal power of receiving, RSSI value and
Received signal power PrConversion relation as follows:
Pr=RSSI_VAL+RSSI_OFFSET [dBm]
Wherein, RSSI_OFFSET is empirical value；LQI reflects the link-quality of channel, and expression connects
Receiving the energy of Frame and quality, its size is based on signal intensity and the signal to noise ratio that detects.
6. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 5
Method processed, it is characterised in that: wherein RSSI_OFFSET takes-45.
7. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 4
Method processed, it is characterised in that: it is to pass through that wherein said sensor node adjusts the method for transmitting power
Software design patterns launches the numerical value of power register, selects different transmitting power.
8. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 6
Method processed, it is characterised in that: wherein said sensor node adjusts the strategy of power and is, when channel
Show when being rated VERYGOOD and GOOD that channel quality is fine, suitably reduce the transmitting power of node,
Reduce the communication power consumption of node；When channel is rated other ranks, node still uses the transmitting of maximum
Power, it is ensured that the connectedness of network and reliability.
9. the topology control of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 3
Method processed, it is characterised in that: wherein step 3) network topology safeguard strategy be, a node
After father node lost efficacy, the power of launching increasing self strengthens the scope of communication, again finds new route；
Being affected channel quality by environment drastically to decline, node strengthens launches the reliable of power assurance communication
Property；New node adds network, and the communication distance between node shortens, and suitably reduces the transmitting of node
Power, to adapt to new network topology.
10. the topology of wireless sensor network based on Dynamic routing mechanisms as claimed in claim 3
Control method, it is characterised in that: wherein step 3) the topological cycle employing intervalometer triggering safeguarded.
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| CN112188484A (en) * | 2020-09-14 | 2021-01-05 | 中标慧安信息技术股份有限公司 | Secure encryption method suitable for sensor network |
| CN112188484B (en) * | 2020-09-14 | 2021-10-26 | 中标慧安信息技术股份有限公司 | Secure encryption method suitable for sensor network |
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