CN114222330A - Wireless sensor network communication system - Google Patents
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- 238000004891 communication Methods 0.000 title claims abstract description 140
- 238000012508 change request Methods 0.000 claims description 22
- 230000002159 abnormal effect Effects 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000012790 confirmation Methods 0.000 claims description 6
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- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000002776 aggregation Effects 0.000 description 7
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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
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a wireless sensor network communication system, which comprises a sink node and at least one wireless sensor, wherein the sink node sends an awakening signal to the wireless sensor, and the awakening signal comprises address information of the sensor to be awakened; the wireless wake-up unit receives the wake-up signal, and if the address information in the wake-up signal is the same as the address information of the wireless sensor to which the wireless wake-up unit belongs, an interrupt signal is sent to the processor; the processor receives the interrupt signal, sends a starting signal to the communication unit and activates the communication unit through the starting signal; the sink node sends data information to the wireless sensor; the communication unit receives the data information and sends feedback information to the sink node according to the data information, and the processor and the communication unit enter a dormant state. According to the wireless sensor network communication system provided by the invention, the service life of the wireless sensor is prolonged through the awakening mechanism, and the awakening signal contains the address information of the sensor to be awakened, so that the accurate awakening of the wireless sensor is realized.
Description
Technical Field
The invention relates to the technical field of wireless sensing, in particular to a wireless sensing network communication system.
Background
With the development of energy transformation and electric power digitization, the power grid puts higher requirements on depth, breadth and density of information perception. The wireless sensor network has the advantages of massive connection, low cost and the like, is the most economical and convenient mode for acquiring basic data such as power grid operation, equipment state, environment and the like, and can effectively support energy Internet and power grid digital and intelligent construction. However, when the wireless sensor network is applied to a power grid, due to the fact that power taking is difficult in application scenes such as transformer substations and power transmission lines, deployment environments of most sensors do not have power supply conditions, and requirements on power consumption are extremely strict.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of high energy consumption of the wireless sensor network in the prior art, so as to provide a wireless sensor network communication system.
The invention provides a wireless sensor network communication system, which comprises a sink node and at least one wireless sensor, wherein one sink node is connected with a plurality of wireless sensors, each wireless sensor comprises a wireless awakening unit, a processor and a communication unit, the sink node sends an awakening signal to the wireless sensor, and the awakening signal comprises address information of the sensor to be awakened; the wireless wake-up unit receives the wake-up signal, if the address information in the wake-up signal is the same as the address information of the wireless sensor to which the wireless wake-up unit belongs, an interrupt signal is sent to the processor, and the processor is awakened through the interrupt signal; the processor receives the interrupt signal, sends a starting signal to the communication unit and activates the communication unit through the starting signal; the sink node sends data information to the wireless sensor; the communication unit receives the data information and sends feedback information to the sink node according to the data information; the sink node receives the feedback information and sends confirmation information to the wireless sensor; the communication unit receives the feedback information, and the processor and the communication unit enter a dormant state.
Optionally, in the wireless sensor network communication system provided by the present invention, the communication unit of each wireless sensor respectively supports one or more communication modes according to the respective monitored service requirement, the environment and the power supply condition; the communication unit of the sink node supports one or more communication modes according to the monitoring service requirement, the environment and the power supply condition in the coverage area; the communication modes supported by the communication unit of the sink node include communication modes supported by the communication units of the wireless sensors connected with the sink node.
Optionally, in the wireless sensor network communication system provided by the present invention, the sending, by the sink node, data information to the wireless sensor includes: the sink node monitors the channel, and if the channel is idle, the sink node backs off for a first random time and then sends data to the wireless sensor, wherein the first random time is less than the transmission time of the network data packet; and if the channel is busy, returning to the step of monitoring the channel after the second random time is backed off until the data information is successfully sent, or the time length after the wake-up signal is sent is greater than the first preset value.
Optionally, in the wireless sensor network communication system provided by the present invention, if the time length after the wireless wakeup unit receives the wakeup signal is greater than the second preset value, the communication unit does not receive the data information, and the processor and the communication unit enter a sleep state.
Optionally, in the wireless sensor network communication system provided by the present invention, the wireless sensor further includes a sensitive device, and the sensitive device is configured to collect sensing data; the processor is periodically and automatically awakened, whether the sensing data acquired by the sensitive component is abnormal or not is judged, and if the sensing data is abnormal, a starting signal and abnormal sensing data are sent to the communication unit; the communication unit monitors the channel, and if the channel is idle, the communication unit sends abnormal sensing data to the sink node after retreating for a third random time; and receiving the confirmation information of the sink node, and enabling the processor and the communication unit to enter a dormant state.
Optionally, in the wireless sensor network communication system provided by the present invention, if the channel is busy, the step of listening to the channel is returned after the channel is backed off for the fourth random time until the abnormal sensing data is successfully sent, or the time length after the processor is wirelessly awakened is greater than the third preset value.
Optionally, in the wireless sensor network communication system provided by the present invention, if the sensing data is normal, the processor enters a sleep state.
Optionally, in the wireless sensor network communication system provided by the present invention, the wireless sensor network communication system is configured with a plurality of candidate channels, the number of the candidate channels is determined according to the operating frequency band of the wireless sensor, and the wireless sensor network communication system determines one of the candidate channels as the operating channel at the same time.
Optionally, in the wireless sensor network communication system provided by the present invention, the sink node records the number of wireless sensors with normal communication functions under the current channel condition, and if the number of wireless sensors with normal communication functions is smaller than a fourth preset value, the sink node repeatedly broadcasts the wake-up signal, broadcasts a channel change request data packet to the network through all frequencies, and adjusts the channel change request data packet to the update channel, where the channel change request data packet includes update channel information; the wireless sensor receives the wake-up signal to enter a wake-up state, receives the channel change request data packet, and adjusts the channel to an update channel according to the update channel information in the change request data packet.
Optionally, in the wireless sensor network communication system provided by the present invention, if the duration of the time during which the wireless sensor does not receive the information of the sink node is greater than a fifth preset value, each candidate channel is searched; and if the channel change request data packet is received, adjusting to an updated channel according to the updated channel information in the change request data packet.
The technical scheme of the invention has the following advantages:
the invention provides a wireless sensor network communication system, wherein a wireless sensor comprises a wireless wake-up unit, a processor and a communication unit, under normal conditions, the wireless sensor is in a dormant state, the power consumption of the processor and the communication unit is extremely low under the dormant state, when the aggregation unit needs to send data to the wireless sensor, the wireless wake-up unit receives a wake-up signal sent by the aggregation unit, then the processor is woken up through an interrupt signal, the processor activates the communication unit through an opening signal, and the wireless sensor is converted from the dormant state to the wake-up state, therefore, in the wireless sensor network communication system provided by the invention, the wireless sensor is converted into the wake-up state only when the wireless sensor needs to work, generally, the wireless sensor is in the dormant state, the power consumption is extremely low, the wireless sensor has longer service time, and when the aggregation unit needs to send data to the wireless sensor, the wireless sensor can be awakened, normal work of a wireless sensor network cannot be influenced, besides, the awakening signal sent by the sink node to the wireless sensor contains address information of the sensor to be awakened, and after the wireless awakening unit receives the awakening signal, only when the address information in the awakening signal is judged to be the same as the address information of the wireless sensor to which the wireless awakening unit belongs, an interrupt signal is sent to the processor, accurate awakening of the sink node to the wireless sensor is achieved, and the fact that the irrelevant wireless sensor is awakened is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a specific example of a wireless sensor network communication system according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a specific example of a wireless sensor in an embodiment of the invention;
fig. 3 is a communication flow diagram of a sink node and a wireless sensor in a wireless sensor network communication system in an embodiment of the present invention;
fig. 4 is a schematic diagram of a protocol architecture of a low power consumption wireless sensor network according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides a wireless sensor network communication system, as shown in fig. 1, including a sink node and at least one wireless sensor, where one sink node is connected to a plurality of wireless sensors, as shown in fig. 2, each wireless sensor includes a wireless wakeup unit, a processor, and a communication unit. In an alternative embodiment, the sink node and the wireless sensor form a star topology.
When the sink node needs to send data information to the wireless sensor, an interaction process between the sink node and the wireless sensor is shown in fig. 3, and includes:
step S11: the sink node sends a wake-up signal to the wireless sensor, and the wake-up signal contains address information of the sensor to be woken up.
In an optional embodiment, the wireless sensor network communication system includes a plurality of wireless sensors, and when the sink node sends the wake-up signal, the sink node adds address information of the sensor to be woken up to the wake-up signal, so that the wake-up signal has an automatic addressing function, and the wake-up of the specific wireless sensor is realized.
Step S12: the wireless wakeup unit receives the wakeup signal, and if the address information in the wakeup signal is the same as the address information of the wireless sensor to which the wireless wakeup unit belongs, step S13 is executed: sending an interrupt signal to the processor, and waking up the processor through the interrupt signal.
In an optional embodiment, if the strength of the wake-up signal received by the wireless wake-up unit is greater than or equal to a preset threshold, the address information in the wake-up signal is identified, the address information in the wake-up signal is compared with the address information of the wireless sensor to which the wake-up unit belongs, if the comparison result is the same, an interrupt signal is sent to the processor in the wireless sensor to which the wake-up unit belongs, and if the comparison result is different, the wake-up signal is discarded.
And if the strength of the wake-up signal received by the wireless wake-up unit is smaller than a preset threshold value, discarding the wake-up signal.
Step S14: the processor receives the interrupt signal, sends a start signal to the communication unit, and activates the communication unit through the start signal.
After the communication unit is activated, the sink node performs step S15: transmitting data information to the wireless sensor, the communication unit performs step S16: data information is received.
After the communication unit receives the data information and performs the corresponding operation according to the data information, the communication unit performs step S17: and sending feedback information to the sink node according to the data information, and enabling the processor and the communication unit to enter a dormant state.
The data information sent by the sink node is control information or data acquisition information, if the data information received by the communication unit is the control information, the wireless sensor sends feedback information to the sink node after executing a related control command, the communication process is finished, and the sensor enters dormancy.
In an optional embodiment, if the data information received by the communication unit is data acquisition information, after the communication unit sends feedback information to the sink node according to the data information, the sink node receives the feedback information and sends confirmation information to the wireless sensor; the communication unit receives the feedback information, and the processor and the communication unit enter a dormant state.
And if the data information received by the communication unit is data acquisition information, the processor acquires the data according to the data acquisition information and sends the acquired data as feedback information to the sink node.
In an optional embodiment, after being awakened, the communication unit actively sends a feedback signal to the aggregation unit, and after receiving the feedback signal, the aggregation unit determines that the communication unit is activated and then sends data information to the wireless sensor.
In an optional embodiment, the convergence unit is configured to determine that the wireless sensor can be woken up normally after sending the wake-up signal, and directly send the data information to the wireless sensor without receiving a feedback signal of the communication unit in the wireless sensor after sending the wake-up signal for a preset time.
In the wireless sensor network communication system provided by the embodiment of the invention, the wireless sensor comprises the wireless wake-up unit, the processor and the communication unit, under a normal condition, the wireless sensor is in a dormant state, the power consumption of the processor and the communication unit is extremely low under the dormant state, when the aggregation unit needs to send data to the wireless sensor, the wireless wake-up unit receives a wake-up signal sent by the aggregation unit, then the processor is woken up through an interrupt signal, the processor activates the communication unit through an opening signal, and the wireless sensor is converted from the dormant state to the wake-up state, so that the wireless sensor is converted into the wake-up state only when the wireless sensor needs to work, generally, the wireless sensor is in the dormant state and has extremely low power consumption, so that the wireless sensor has longer service life, when the sink unit needs to send data to the wireless sensor, the wireless sensor can be awakened, normal work of a wireless sensor network cannot be influenced, besides, the address information of the sensor to be awakened is contained in an awakening signal sent by the sink node to the wireless sensor, and after the wireless awakening unit receives the awakening signal, only when the address information in the awakening signal is judged to be the same as the address information of the wireless sensor to which the wireless awakening unit belongs, an interrupt signal is sent to the processor, accurate awakening of the sink node to the wireless sensor is achieved, and the fact that irrelevant wireless sensors are awakened is avoided.
In an optional embodiment, in the wireless sensor network communication system provided in the embodiment of the present invention, the communication unit of each wireless sensor respectively supports one or more communication modes according to the monitored service requirement, the environment and the power supply condition.
The communication unit of the sink node supports one or more communication modes according to the monitoring service requirement in the coverage area, the communication requirement of the monitoring service, the environment and the power supply condition.
Exemplarily, a low-power wireless sensor network protocol architecture used by the wireless sensor in the embodiment of the present invention is as shown in fig. 4, and communication protocols supported by the wireless sensor and the sink node include, but are not limited to, low-power narrowband wireless communication protocols such as Bluetooth 4.0, Bluetooth 5.0, ZigBee, NB-IoT, LoRa, Sigfox, broadband wireless communication protocols such as WiFi, and other national, alliance, industry-level or enterprise-level protocols oriented to monitoring applications of the internet of things.
The communication modes supported by the communication unit of the sink node include communication modes supported by the communication units of the wireless sensors connected with the sink node. In the embodiment of the invention, when the wireless sensor network is constructed, the wireless sensor is only connected with the sink node with the same communication protocol as the wireless sensor network, and exemplarily, if the wireless sensor supports the ZigBee protocol, the sink node connected with the wireless sensor also supports the ZigBee protocol.
In an optional embodiment, the step of sending, by the sink node, the data information to the wireless sensor specifically includes:
the sink node monitors a channel, and if the channel is idle, the sink node backs off for a first random time and then sends data to the wireless sensor;
in an alternative embodiment, the first random time may be any value, and the first backoff varies with time if the channel is idle before the sink node sends information each time. The first random time is less than the shortest transmission time of the network data packet.
And if the channel is busy, returning to the step of monitoring the channel after the second random time is backed off until the data information is successfully sent, or the time length after the wake-up signal is sent is greater than the first preset value.
In an optional embodiment, the second random time is greater than the first random time, the second random time is greater than the longest output time of the network data packet, if the sink node detects that the channel is busy, it indicates that there is data transmission in the channel, and therefore it needs to back off for a longer time, and after the data transmission in the channel is completed, the channel is monitored again.
In an optional embodiment, if the time length after the wireless wakeup unit receives the wakeup signal is greater than the second preset value, the communication unit does not receive the data information, and the processor and the communication unit enter a sleep state. In an optional embodiment, the first preset value is less than or equal to the second preset value.
In an optional embodiment, in the wireless sensor network communication system provided in the embodiment of the present invention, the wireless sensor further includes a sensitive component, and the sensitive component is configured to collect sensing data.
In an alternative embodiment, the types of the wireless sensors included in the wireless sensor network communication system are different, and the sensitive components included in the wireless sensors are different for different wireless sensors, and for example, the sensitive components may be a thermosensitive element, a photosensitive element, a gas sensitive element, and the like.
In an optional embodiment, when the wireless sensor needs to actively report information to the sink node, the interaction flow between the wireless sensor and the sink node specifically includes:
the processor is automatically awakened periodically, whether the sensing data acquired by the sensitive component is abnormal or not is judged, if the sensing data is normal, the processor enters a dormant state, and if the sensing data is abnormal, a starting signal and abnormal sensing data are sent to the communication unit. In the embodiment of the invention, the processor automatically enters the awakening state at intervals and analyzes the sensing data acquired by the sensitive component.
And the communication unit monitors the channel, if the channel is idle, the communication unit backs off for a third random time and then sends abnormal sensing data to the sink node, receives confirmation information of the sink node, and the processor and the communication unit enter a dormant state.
In an alternative embodiment, the third random time may be any value, and the third backoff may be different over time if the channel is idle before the wireless sensor transmits information each time. The third random time is less than the shortest transmission time of the network data packet.
And if the channel is busy, returning to the step of monitoring the channel after the fourth random time is backed off until the abnormal sensing data is successfully sent, or the duration of the processor after wireless awakening is greater than a third preset value.
In an alternative embodiment, the fourth random time is greater than the maximum transmission time of the network packet.
And when the time length of the processor in the awakening state is greater than a third preset value, the processor enters the dormant state again.
In an optional embodiment, the wireless sensor network communication system is configured with a plurality of candidate channels, the number of the candidate channels is determined according to the working frequency band of the wireless sensor, and the wireless sensor network communication system determines one of the candidate channels as the working channel at the same time.
In an alternative embodiment, an operating frequency is used to define a channel, and the operating frequency range includes, but is not limited to, 230MHz, 470-510 MHz, and 2.4 GHz.
In an optional embodiment, the sink node records the number of the wireless sensors with normal communication functions under the current channel condition, and if the number of the wireless sensors with normal communication functions is smaller than a fourth preset value, the sink node executes the following steps:
the sink node broadcasts the wake-up signal repeatedly, broadcasts a channel change request data packet to the network through all the candidate channels, and adjusts the channel change request data packet to an update channel, wherein the channel change request data packet comprises update channel information.
In the embodiment of the present invention, in order to ensure that more wireless sensors can receive the channel change request packet and complete channel switching, the sink node repeatedly broadcasts the change signal, wherein the number of times of repetition may be preset according to actual requirements, or may be determined according to the number of wireless sensors switched to the update channel.
The wireless sensor receives the wake-up signal to enter a wake-up state, receives the channel change request data packet, and adjusts the channel to an update channel according to the update channel information in the change request data packet.
If the wireless sensor receives the wake-up signal broadcasted by the sink node, the address information in the wake-up signal does not need to be verified.
In an optional embodiment, if the duration of the wireless sensor not receiving the information of the sink node is longer than a fifth preset value, each candidate channel is searched, and if a channel change request data packet is received, the candidate channel is adjusted to an updated channel according to updated channel information in the change request data packet.
In the embodiment of the invention, if the current channel can not meet the normal communication between the sink node and the wireless sensor in the wireless sensor network communication system, the channel is replaced, and the normal communication between the wireless sensor and the sink node is ensured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A wireless sensor network communication system is characterized by comprising a sink node and at least one wireless sensor, wherein one sink node is connected with a plurality of wireless sensors, each wireless sensor comprises a wireless awakening unit, a processor and a communication unit,
the sink node sends a wake-up signal to the wireless sensor, wherein the wake-up signal comprises address information of the sensor to be woken up;
the wireless awakening unit receives the awakening signal, if address information in the awakening signal is the same as address information of the wireless sensor to which the wireless awakening unit belongs, an interrupt signal is sent to the processor, and the processor is awakened through the interrupt signal;
the processor receives the interrupt signal, sends a starting signal to the communication unit, and activates the communication unit through the starting signal;
the sink node sends data information to the wireless sensor;
the communication unit receives the data information and sends feedback information to the sink node according to the data information, and the processor and the communication unit enter a dormant state.
2. The wireless sensor network communication system according to claim 1, wherein after the step of sending feedback information to the sink node according to the data information, before the step of the processor and the communication unit entering the sleep state, further comprising:
the sink node receives the feedback information and sends confirmation information to the wireless sensor;
and the communication unit receives the feedback information, and the processor and the communication unit enter a dormant state.
3. The wireless sensor network communication system of claim 1,
the communication units of the wireless sensors respectively support one or more communication modes according to respective monitoring service requirements, environments and power supply conditions;
the communication unit of the sink node supports one or more communication modes according to the monitoring service requirement, the environment and the power supply condition in the coverage area;
the communication modes supported by the communication unit of the sink node include communication modes supported by the communication units of the wireless sensors connected with the sink node.
4. The wireless sensor network communication system of claim 1, wherein the sink node sends data information to the wireless sensor, comprising:
the sink node monitors a channel, and if the channel is idle, the sink node backs off for a first random time and then sends data to the wireless sensor;
and if the channel is busy, returning to the step of monitoring the channel after the second random time is backed off until the data information is successfully sent, or the time length after the wake-up signal is sent is greater than a first preset value.
5. The wireless sensor network communication system of claim 1,
and if the time length of the wireless awakening unit after receiving the awakening signal is greater than a second preset value, the communication unit does not receive the data information, and the processor and the communication unit enter a dormant state.
6. The wireless sensor network communication system of claim 1, wherein the wireless sensor further comprises a sensitive component,
the sensitive component is used for collecting sensing data;
the processor is periodically and automatically awakened, judges whether sensing data acquired by the sensitive component is abnormal or not, and sends a starting signal and abnormal sensing data to the communication unit if the sensing data is abnormal;
the communication unit monitors a channel, if the channel is idle, the communication unit backs off for a third random time and then sends the abnormal sensing data to the sink node, receives confirmation information of the sink node, and the processor and the communication unit enter a dormant state;
and if the channel is busy, returning to the step of monitoring the channel after retreating for a fourth random time until the abnormal sensing data is successfully sent, or the duration of the processor after wireless awakening is greater than a third preset value.
7. The wireless sensor network communication system of claim 6,
and if the sensing data is normal, the processor enters a dormant state.
8. The wireless sensor network communication system of claim 1,
the wireless sensor network communication system is configured with a plurality of candidate channels, the number of the candidate channels is determined according to the working frequency range of the wireless sensor, and the wireless sensor network communication system determines one of the candidate channels as a working channel at the same time.
9. The wireless sensor network communication system of claim 8,
the sink node records the number of the wireless sensors with normal communication function under the current channel condition, if the number of the wireless sensors with normal communication function is smaller than a fourth preset value,
the sink node broadcasts the wake-up signal repeatedly, broadcasts a channel change request data packet to the network through all candidate channels, and adjusts the channel change request data packet to an update channel, wherein the channel change request data packet comprises update channel information;
and the wireless sensor receives the wake-up signal to enter a wake-up state, receives a channel change request data packet, and adjusts to an update channel according to update channel information in the change request data packet.
10. The wireless sensor network communication system of claim 8,
if the duration of the information of the sink node which is not received by the wireless sensor is longer than a fifth preset value, searching each candidate channel;
and if a channel change request data packet is received, adjusting to an updated channel according to the updated channel information in the change request data packet.
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