A wireless sensor network communication system

Abstract

The present invention provides a wireless sensor network communication system, including a convergence node and at least one wireless sensor, the convergence node sends a wake-up signal to the wireless sensor, the wake-up signal includes the address information of the sensor to be awakened; the wireless awakening 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 awakening unit belongs, an interrupt signal is sent to the processor; the processor receives the interrupt signal, sends a start signal to the communication unit, and activates the communication unit through the start signal; the convergence node sends data information to the wireless sensor; the communication unit receives the data information, and sends feedback information to the convergence node according to the data information, and the processor and the communication unit enter a dormant state. The wireless sensor network communication system provided by the present invention improves the service life of the wireless sensor through the wake-up mechanism, and the wake-up signal includes the address information of the sensor to be awakened, thereby realizing accurate awakening of the wireless sensor.

Description

Technical Field

[0001] The present invention relates to the field of wireless sensor technology, and in particular to a wireless sensor network communication system. Background Art

[0002] With the development of energy transformation and power digitization, the power grid has put forward higher requirements for the depth, breadth and density of information perception. Wireless sensor networks have the advantages of massive connections and low costs. They are the most economical and convenient way to obtain basic data such as power grid operation, equipment status, and environment. They can effectively support the construction of energy Internet and power grid digitization and intelligence. However, when wireless sensor networks are applied to power grids, due to the difficulty of obtaining electricity in application scenarios such as substations and transmission lines, the deployment environment of most sensors does not have power supply conditions, and the power consumption requirements are extremely strict. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of high energy consumption of wireless sensor networks in the prior art, thereby providing a wireless sensor network communication system.

[0004] The present invention provides a wireless sensor network communication system, comprising a convergence node and at least one wireless sensor, wherein one convergence node is connected to a plurality of wireless sensors, each of which comprises a wireless awakening unit, a processor and a communication unit, wherein the convergence node sends a awakening signal to the wireless sensor, wherein the awakening signal comprises address information of the sensor to be awakened; the wireless awakening unit receives the awakening signal, and if the address information in the awakening signal is 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, and the processor is awakened by the interrupt signal; the processor receives the interrupt signal, sends a start signal to the communication unit, and activates the communication unit by the start signal; the convergence node sends data information to the wireless sensor; the communication unit receives the data information, and sends feedback information to the convergence node according to the data information; the convergence 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.

[0005] Optionally, in the wireless sensor network communication system provided by the present invention, the communication unit of each wireless sensor supports one or more communication modes according to its own monitoring business needs, environment and power supply conditions; the communication unit of the aggregation node supports one or more communication modes according to the monitoring business needs, environment and power supply conditions within its coverage area; the communication modes supported by the communication unit of the aggregation node include the communication modes supported by the communication units of each wireless sensor connected to it.

[0006] Optionally, in the wireless sensor network communication system provided by the present invention, the aggregation node sends data information to the wireless sensor, including: the aggregation node listens to the channel, and if the channel is idle, sends data to the wireless sensor after backing off for a first random time, and the first random time is less than the network data packet transmission time; if the channel is busy, returns to the step of listening to the channel after backing off for a second random time, until the data information is successfully sent, or the time length after sending the wake-up signal is greater than a first preset value.

[0007] Optionally, in the wireless sensor network communication system provided by the present invention, if the time after the wireless wake-up unit receives the wake-up signal is greater than a second preset value, the communication unit does not receive data information, and the processor and the communication unit enter a sleep state.

[0008] Optionally, in the wireless sensor network communication system provided by the present invention, the wireless sensor also includes sensitive components, which are used to collect perception data; the processor automatically wakes up periodically and determines whether the perception data collected by the sensitive components is abnormal. If the perception data is abnormal, a start signal and abnormal perception data are sent to the communication unit; the communication unit listens to the channel, and if the channel is idle, the abnormal perception data is sent to the aggregation node after backing off for a third random time; after receiving confirmation information from the aggregation node, the processor and the communication unit enter a sleep state.

[0009] Optionally, in the wireless sensor network communication system provided by the present invention, if the channel is busy, the step of returning to the channel listening step is performed after backing off for a fourth random time until the abnormal sensing data is successfully sent, or the duration after the processor is wirelessly awakened is greater than a third preset value.

[0010] Optionally, in the wireless sensor network communication system provided by the present invention, if the sensed data is normal, the processor enters a sleep state.

[0011] Optionally, in the wireless sensor network communication system provided by the present invention, the wireless sensor network communication system is configured with multiple candidate channels, the number of candidate channels is determined according to the working frequency band of the wireless sensor, and at the same time the wireless sensor network communication system determines one of the candidate channels as the working channel.

[0012] Optionally, in the wireless sensor network communication system provided by the present invention, the aggregation node records the number of wireless sensors with normal communication functions under the current channel conditions. If the number of wireless sensors with normal communication functions is less than a fourth preset value, the aggregation node repeatedly broadcasts a wake-up signal, broadcasts a channel change request data packet to the network through all frequencies, and adjusts to the update channel, wherein the channel change request data packet includes update channel information; the wireless sensor receives the wake-up signal and enters a wake-up state, and receives a channel change request data packet, and adjusts to the update channel according to the update channel information in the change request data packet.

[0013] Optionally, in the wireless sensor network communication system provided by the present invention, if the duration for which the wireless sensor has not received information from the aggregation node is greater than a fifth preset value, each candidate channel is searched; if a channel change request data packet is received, the update channel is adjusted according to the update channel information in the change request data packet.

[0014] The technical solution of the present invention has the following advantages:

[0015] The wireless sensor network communication system provided by the present invention comprises a wireless wake-up unit, a processor and a communication unit. Under normal circumstances, the wireless sensor is in a dormant state. The processor and the communication unit consume very little power in the dormant state. When the convergence unit needs to send data to the wireless sensor, the wireless wake-up unit receives the wake-up signal sent by the convergence unit, and then wakes up the processor through an interrupt signal. The processor then activates the communication unit through an on signal. At this time, the wireless sensor is converted from the dormant state to the awakened state. It can be seen that in the wireless sensor network communication system provided by the present invention, the wireless sensor is converted to the awakened state only when it needs to work. Generally, it is in the dormant state with very little power consumption, so that the wireless sensor has a longer service time. Moreover, when the convergence unit needs to send data to the wireless sensor, the wireless sensor can be awakened without affecting the normal operation of the wireless sensor network. In addition, the wake-up signal sent by the convergence node to the wireless sensor contains the address information of the sensor to be awakened. After receiving the wake-up signal, the wireless wake-up unit sends an interrupt signal to the processor only when it is determined that 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. This realizes the accurate awakening of the wireless sensor by the convergence node and avoids the awakening of irrelevant wireless sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of a specific example of a wireless sensor network communication system in an embodiment of the present invention;

[0018] Figure 2 is a principle block diagram of a specific example of a wireless sensor in an embodiment of the present invention;

[0019] Figure 3 is a communication flow chart of a sink node and a wireless sensor in a wireless sensor network communication system in a specific example according to an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the low-power wireless sensor network protocol architecture in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms “first”, “second”, “third” and “fourth” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The embodiment of the present invention provides a wireless sensor network communication system, such as Figure 1 As shown, it includes a sink node and at least one wireless sensor, and one sink node is connected to multiple wireless sensors, such as Figure 2 As shown, each wireless sensor includes a wireless wake-up unit, a processor, and a communication unit. In an optional embodiment, the aggregation node and the wireless sensors form a star topology.

[0025] When the sink node needs to send data information to the wireless sensor, the interaction process between the sink node and the wireless sensor is as follows: Figure 3 As shown, including:

[0026] Step S11: the aggregation node sends a wake-up signal to the wireless sensor, where the wake-up signal includes address information of the sensor to be awakened.

[0027] In an optional embodiment, the wireless sensor network communication system includes multiple wireless sensors. When the aggregation node sends a wake-up signal, the address information of the sensor to be awakened is added to the wake-up signal, so that the wake-up signal has an automatic addressing function to realize the awakening of a specific wireless sensor.

[0028] Step S12: the wireless awakening unit receives the awakening signal. If the address information in the awakening signal is the same as the address information of the wireless sensor to which the wireless awakening unit belongs, step S13 is executed: an interrupt signal is sent to the processor to wake up the processor through the interrupt signal.

[0029] 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, and 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 results are the same, an interrupt signal is sent to the processor in the wireless sensor to which the wake-up unit belongs. If the comparison results are different, the wake-up signal is discarded.

[0030] If the strength of the wake-up signal received by the wireless wake-up unit is less than a preset threshold, the wake-up signal is discarded.

[0031] Step S14: the processor receives the interrupt signal, sends an enable signal to the communication unit, and activates the communication unit through the enable signal.

[0032] After the communication unit is activated, the sink node executes step S15: sending data information to the wireless sensor, and the communication unit executes step S16: receiving data information.

[0033] After receiving the data information and performing corresponding operations according to the data information, the communication unit executes step S17: sending feedback information to the aggregation node according to the data information, and the processor and the communication unit enter a dormant state.

[0034] The data information sent by the aggregation node is control information or data acquisition information. If the data information received by the communication unit is control information, the wireless sensor sends feedback information to the aggregation node after executing the relevant control command, the communication process ends, and the sensor enters sleep.

[0035] In an optional embodiment, if the data information received by the communication unit is data collection information, after the communication unit sends feedback information to the aggregation node based on the data information, the aggregation 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 sleep state.

[0036] If the data information received by the communication unit is data collection information, the processor performs data collection according to the data collection information, and sends the collected data as feedback information to the aggregation node.

[0037] In an optional embodiment, after being awakened, the communication unit actively sends a feedback signal to the convergence unit. After receiving the feedback signal, the convergence unit determines that the communication unit is activated and then sends data information to the wireless sensor.

[0038] In an optional embodiment, after the convergence unit sends a wake-up signal, it is assumed that the wireless sensor can be awakened normally. After a preset time after the wake-up signal is sent, there is no need to receive a feedback signal from the communication unit in the wireless sensor, and data information is directly sent to the wireless sensor.

[0039] The wireless sensor network communication system provided by the embodiment of the present invention comprises a wireless wake-up unit, a processor, and a communication unit. Under normal circumstances, the wireless sensor is in a dormant state. The processor and the communication unit consume very little power in the dormant state. When the convergence unit needs to send data to the wireless sensor, the wireless wake-up unit receives the wake-up signal sent by the convergence unit, and then wakes up the processor through an interrupt signal. The processor then activates the communication unit through an on signal. At this time, the wireless sensor is converted from the dormant state to the awakened state. It can be seen that in the wireless sensor network communication system provided by the embodiment of the present invention, the wireless sensor is converted to the awakened state only when it needs to work. Generally, it is in the dormant state with very little power consumption, so that the wireless sensor has a longer service time. Moreover, when the convergence unit needs to send data to the wireless sensor, the wireless sensor can be awakened without affecting the normal operation of the wireless sensor network. In addition, the wake-up signal sent by the convergence node to the wireless sensor contains the address information of the sensor to be awakened. After receiving the wake-up signal, the wireless wake-up unit sends an interrupt signal to the processor only when it is determined that 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. The convergence node accurately awakens the wireless sensor and avoids the awakening of irrelevant wireless sensors.

[0040] In an optional embodiment, in the wireless sensor network communication system provided by the embodiment of the present invention, the communication unit of each wireless sensor supports one or more communication modes according to its own monitoring service requirements, environment and power supply conditions.

[0041] The communication unit of the aggregation node supports one or more communication modes according to the monitoring service requirements within its coverage area, the communication requirements of the monitoring service, the environment and power supply conditions.

[0042] For example, the low-power wireless sensor network protocol architecture used by the wireless sensor in the embodiment of the present invention is as follows: Figure 4 As shown, the communication protocols supported by wireless sensors and aggregation nodes 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 or enterprise-level protocols for IoT monitoring applications.

[0043] The communication modes supported by the communication unit of the aggregation node include the communication modes supported by the communication units of the wireless sensors connected thereto. In the embodiment of the present invention, when the wireless sensor network is constructed, the wireless sensor is only connected to the aggregation node with the same communication protocol as it. For example, if the wireless sensor supports the ZigBee protocol, the aggregation node connected thereto also supports the ZigBee protocol.

[0044] In an optional embodiment, the step of the aggregation node sending data information to the wireless sensor specifically includes:

[0045] The sink node monitors the channel, and if the channel is idle, it sends data to the wireless sensor after backing off for a first random time;

[0046] In an optional embodiment, the first random time can be any value, and before the sink node sends information each time, if the channel is idle, the first random time of backoff is different. The first random time is less than the shortest transmission time of the network data packet.

[0047] If the channel is busy, the process returns to the step of monitoring the channel after backing off for a second random time, until the data information is successfully sent, or the time after the wake-up signal is sent is greater than a first preset value.

[0048] In an optional embodiment, the second random time is greater than the first random time, and the second random time is greater than the longest output time of the network data packet. If the aggregation node detects that the channel is busy, it means that there is data transmission in the channel, so it is necessary to back off for a longer time. After the current data transmission in the channel is completed, the channel is listened to again.

[0049] In an optional embodiment, if the time after the wireless wake-up unit receives the wake-up signal is longer than the second preset value, the communication unit does not receive data information, and the processor and the communication unit enter a dormant state. In an optional embodiment, the first preset value is less than or equal to the second preset value.

[0050] In an optional embodiment, in the wireless sensor network communication system provided by the embodiment of the present invention, the wireless sensor further includes a sensitive component, and the sensitive component is used to collect perception data.

[0051] In an optional embodiment, the wireless sensors included in the wireless sensor network communication system are of different types, and different wireless sensors contain different sensitive components. For example, the sensitive components may be thermal sensors, photosensitive elements, gas sensors, and the like.

[0052] In an optional embodiment, when the wireless sensor needs to actively report information to the aggregation node, the interaction process between the wireless sensor and the aggregation node specifically includes:

[0053] The processor automatically wakes up periodically and determines whether the sensed data collected by the sensitive components is abnormal. If the sensed data is normal, the processor enters a dormant state. If the sensed data is abnormal, the processor sends a start signal and abnormal sensed data to the communication unit. In an embodiment of the present invention, the processor automatically enters a wake-up state at intervals and analyzes the sensed data collected by the sensitive components.

[0054] The communication unit monitors the channel, and if the channel is idle, sends abnormal sensing data to the aggregation node after backing off for a third random time, receives confirmation information from the aggregation node, and the processor and the communication unit enter a sleep state.

[0055] In an optional embodiment, the third random time can be any value, and before the wireless sensor sends information each time, if the channel is idle, the third random time of the backoff is different. The third random time is less than the shortest transmission time of the network data packet.

[0056] If the channel is busy, the process returns to the step of monitoring the channel after backing off for a fourth random time until the abnormal sensing data is sent successfully, or the duration after the processor is wirelessly awakened is greater than a third preset value.

[0057] In an optional embodiment, the fourth random time is greater than the longest transmission time of the network data packet.

[0058] When the processor is in the awake state for a time period longer than a third preset value, the processor enters the sleep state again.

[0059] In an optional embodiment, the wireless sensor network communication system is configured with multiple candidate channels, the number of 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.

[0060] In an optional embodiment, a channel is defined using an operating frequency, and the operating frequency band range includes but is not limited to 230 MHz, 470-510 MHz, and 2.4 GHz.

[0061] In an optional embodiment, 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 less than a fourth preset value, the following steps are performed:

[0062] The sink node repeatedly broadcasts the wake-up signal, broadcasts the channel change request data packet to the network through all candidate channels, and adjusts to the update channel. The channel change request data packet includes the update channel information.

[0063] In an embodiment of the present invention, in order to ensure that more wireless sensors can receive channel change request data packets and complete channel switching, the aggregation node repeatedly broadcasts the renewal signal, wherein the number of repetitions can be pre-set according to actual needs, and can also be determined according to the number of wireless sensors switched to the update channel.

[0064] The wireless sensor receives the wake-up signal and enters the wake-up state, and receives the channel change request data packet, and adjusts to the update channel according to the update channel information in the change request data packet.

[0065] If the wireless sensor receives a wake-up signal broadcast by the sink node, it is not necessary to verify the address information in the wake-up signal.

[0066] In an optional embodiment, if the duration for which the wireless sensor has not received information from the aggregation node is greater than a fifth preset value, each candidate channel is searched, and if a channel change request data packet is received, the channel is adjusted to the update channel according to the update channel information in the change request data packet.

[0067] In the embodiment of the present invention, if the current channel cannot meet the normal communication between the aggregation node and the wireless sensor in the wireless sensor network communication system, the channel is changed to ensure the normal communication between the wireless sensor and the aggregation node.

[0068] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A wireless sensor network communication system, characterized in that: It includes a convergence node and at least one wireless sensor. One convergence node is connected to multiple wireless sensors. Each of the wireless sensors includes a wireless wake-up unit, a processor, and a communication unit. The aggregation node sends a wake-up signal to the wireless sensor, where the wake-up signal includes address information of the sensor to be awakened; The wireless wake-up unit receives the wake-up signal, and if the strength of the wake-up signal received by the wireless wake-up unit is greater than or equal to a preset threshold, identifies the address information in 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, sends an interrupt signal to the processor, and wakes up the processor through the interrupt signal; if the strength of the wake-up signal received by the wireless wake-up unit is less than the preset threshold, discards the wake-up signal; The processor receives the interrupt signal, sends an enable signal to the communication unit, and activates the communication unit through the enable signal; The aggregation node sends data information to the wireless sensor; The communication unit receives the data information, and sends feedback information to the aggregation node according to the data information, and the processor and the communication unit enter a dormant state; 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 at the same time the wireless sensor network communication system determines one of the candidate channels as the working channel; The aggregation 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 less than a fourth preset value, The aggregation node repeatedly broadcasts the wake-up signal, broadcasts a channel change request data packet to the network through all candidate channels, and adjusts to the update channel, wherein the channel change request data packet includes update channel information; if the wireless sensor receives the wake-up signal broadcast by the aggregation node, it is not necessary to verify the address information in the wake-up signal; The wireless sensor receives the wake-up signal and enters a wake-up state, and receives a channel change request data packet, and adjusts to an update channel according to update channel information in the change request data packet; If the duration for which the wireless sensor does not receive the information from the sink node is longer than a fifth preset value, searching each of the candidate channels; If a channel change request packet is received, the channel is adjusted to the updated channel according to the updated channel information in the change request packet.

2. The wireless sensor network communication system according to claim 1, characterized in that: After the step of sending feedback information to the aggregation node according to the data information and before the step of the processor and the communication unit entering a dormant state, the method further includes: The aggregation 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 sleep state.

3. The wireless sensor network communication system according to claim 1, characterized in that: The communication unit of each wireless sensor supports one or more communication modes according to its monitoring business requirements, environment and power supply conditions; The communication unit of the aggregation node supports one or more communication modes according to the monitoring service requirements, the environment and power supply conditions within its coverage area; The communication modes supported by the communication unit of the aggregation node include the communication modes supported by the communication units of the wireless sensors connected thereto.

4. The wireless sensor network communication system according to claim 1, characterized in that: The aggregation node sends data information to the wireless sensor, including: The aggregation node monitors the channel, and if the channel is idle, sends data to the wireless sensor after backing off for a first random time; If the channel is busy, the process returns to the step of monitoring the channel after backing off for a second random time, until the data information is successfully sent, or the time after the wake-up signal is sent is greater than a first preset value.

5. The wireless sensor network communication system according to claim 1, characterized in that: If the time length after the wireless awakening unit receives the awakening signal is greater than a second preset value, the communication unit does not receive data information, and the processor and the communication unit enter a dormant state.

6. The wireless sensor network communication system according to claim 1, characterized in that: The wireless sensor also includes sensitive components. The sensitive components are used to collect perception data; The processor automatically wakes up periodically and determines whether the sensing data collected by the sensitive component is abnormal. If the sensing data is abnormal, a start signal and abnormal sensing data are sent to the communication unit; The communication unit monitors the channel, and if the channel is idle, sends the abnormal sensing data to the aggregation node after backing off for a third random time, receives confirmation information from the aggregation node, and the processor and the communication unit enter a sleep state; If the channel is busy, the step of returning to the channel listening step after backing off for a fourth random time, until the abnormal sensing data is sent successfully, or the duration after the processor is wirelessly awakened is greater than a third preset value.

7. The wireless sensor network communication system according to claim 6, characterized in that: If the sensing data is normal, the processor enters a sleep state.

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