Communication method, communication node and communication system

Abstract

The embodiment of the invention discloses a communication method, a communication node and a communication system, and the method comprises the steps: receiving a downlink data frame comprising time slot sorting information of uplink communication of the communication node, determining data sending time according to the time slot sorting information, entering a low-power-consumption dormant state in response to the data sending time not arriving, and entering a low-power-consumption dormant state in response to the data sending time arriving. According to the invention, low-power-consumption communication can be realized only based on the data exchange process, and the power consumption of the communication process is reduced on the premise that no extra cost is needed.

Description

Technical Field

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

[0002] As the Internet of Things (IoT) continues to grow, the intelligentization of devices has become an unstoppable trend, and the process of connecting everything is also advancing steadily. However, in the current IoT system, many end nodes still rely on batteries for power supply. Limited by battery capacity, these nodes are extremely sensitive to power consumption, and thus the demand for low-power communication technology has become increasingly prominent. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a communication method, a communication node and a communication system to reduce the power consumption of each communication node during the communication process.

[0004] In a first aspect, an embodiment of the present invention provides a communication method, applicable to a communication node, the method comprising:

[0005] Receiving a downlink data frame, wherein the downlink data frame includes time slot sequencing information of uplink communication of the communication node;

[0006] Determine the data transmission time according to the time slot sorting information;

[0007] In response to not reaching the data sending time, entering a low power consumption sleep state;

[0008] In response to reaching the data sending time, exiting the low power sleep state and sending uplink data.

[0009] Optionally, in response to the data transmission time not being reached, entering the low power sleep state comprises: in response to the data transmission time not being reached, setting a first timer and entering the low power sleep state, wherein the first timer is used to prompt that the data transmission time has arrived;

[0010] The step of exiting the low-power sleep state and sending uplink data in response to reaching the data sending time includes: exiting the low-power sleep state and sending the uplink data in response to the first timer being triggered.

[0011] Optionally, the downlink data frame further includes: data transmitted to the communication node, a beacon, time synchronization information and / or time information of the next time the control node sends the downlink data frame.

[0012] Optionally, after receiving the downlink data frame, the method further includes:

[0013] Time synchronization is performed according to the time synchronization information.

[0014] Optionally, after sending the uplink data, the method further includes:

[0015] In response to the next time when the control node sends a downlink data frame not arriving, setting a second timer according to the time information of the next time when the control node sends a downlink data frame, and entering the low-power sleep state;

[0016] In response to the second timer being triggered, the low power sleep state is exited.

[0017] Optionally, the method further comprises:

[0018] Entering the low-power sleep state in response to receiving a sleep instruction from a control node, the sleep instruction including a detection cycle;

[0019] Periodically detecting a wake-up signal according to the detection period;

[0020] In response to detecting the wake-up signal, and the wake-up signal carries an instruction to modify the detection cycle, modifying the detection cycle and continuing to maintain the low-power sleep state;

[0021] In response to detecting the wake-up signal, wherein the wake-up signal carries a wake-up instruction, exiting the low-power sleep state.

[0022] Optionally, when the communication node is located at the first one of the time slot sorting information, the method includes:

[0023] Receiving a downlink data frame, wherein the downlink data frame includes time slot sequencing information of uplink communication of the communication node;

[0024] Determine the data transmission time according to the time slot sorting information;

[0025] In response to reaching the data sending time, uplink data is sent.

[0026] In a second aspect, an embodiment of the present invention provides a communication node, wherein the communication node is configured to execute the method as described above.

[0027] In a third aspect, an embodiment of the present invention provides a communication system, the communication system comprising:

[0028] At least one communication node, configured to execute the method as described above;

[0029] Control node: configured to send downlink data frames to the at least one communication node and receive uplink data sent by the at least one communication node.

[0030] Optionally, the control node is further configured to:

[0031] Sending a sleep instruction to the at least one communication node, the sleep instruction including a detection period;

[0032] A wake-up signal of a preset duration is continuously sent to the at least one communication node, where the preset duration is not less than the detection period, and the wake-up signal includes: an instruction to modify the detection period or a wake-up instruction.

[0033] The embodiment of the present invention receives a downlink data frame including time slot sorting information of uplink communication of a communication node, determines a data sending time according to the time slot sorting information, enters a low-power sleep state in response to failure to arrive at the data sending time, exits the low-power sleep state in response to arrival of the data sending time, and sends uplink data. Thus, low-power communication can be achieved based only on a data exchange process, thereby reducing power consumption of the communication process without requiring additional costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0035] Figure 1 is a schematic diagram of a communication system according to an embodiment of the present invention;

[0036] Figure 2 is a flow chart of a communication method according to an embodiment of the present invention;

[0037] Figure 3 is a flow chart of another communication method according to an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of a communication process of an embodiment of the present invention;

[0039] Figure 5 is a flowchart of a method for waking up from a dormant state according to an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of a sleep state awakening process according to an embodiment of the present invention;

[0041] Figure 7 is a schematic diagram of a communication device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present application is described below based on embodiments, but the present application is not limited to these embodiments. In the detailed description of the present application below, some specific details are described in detail. It is possible for those skilled in the art to fully understand the present application without the description of these details. In order to avoid confusing the essence of the present application, known methods, processes, flows, components and circuits are not described in detail.

[0043] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0044] Unless the context clearly requires otherwise, the words "include", "comprising" and similar words throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0045] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0046] Figure 1 Schematic diagram of a communication system according to an embodiment of the present invention. Figure 1 As shown, the communication system of the embodiment of the present invention includes a control node 11 and at least one communication node 12 , and there is a communication connection between the control node 11 and the communication node 12 .

[0047] In an optional implementation, the communication node 12 is connected to the terminal device to obtain data from the terminal device or send the received data to the terminal device. Optionally, the terminal device can be a sensor (such as a temperature sensor, an acceleration sensor, etc.) or an execution device (such as a smart switch, etc.), which is not limited in this embodiment.

[0048] During the communication process, the control node 11 sends a downlink data frame to at least one communication node 12, and receives uplink data sent by at least one communication node 12. The uplink data includes data obtained from the terminal device or the execution result of the terminal device. When receiving the downlink data frame sent by the control node 11, the communication node 12 selects to obtain data from the terminal device and forward it to the control node 11, or sends relevant data to the terminal device, and feeds back the result to the control node 11 according to the data in the downlink data frame.

[0049] In order to reduce power consumption during communication, the communication node 12 can switch between the communication state and the low-power sleep state. In the communication state, the communication node 12 can normally exchange data with the control node 11. After entering the low-power sleep state, the communication node 12 suspends the operation of most functional components except the timing-related modules, and only maintains the normal operation of the timing-related parts, so as to switch to the communication state at a predetermined time, thereby minimizing resource consumption.

[0050] Figure 21 is a flow chart of a communication method according to an embodiment of the present invention. In the communication process, taking a communication node 12 as an example, when the communication node 12 is in a communication state, it continuously detects downlink data frames from the control node 11 and executes the following steps: Figure 2 The communication method shown. Figure 2 As shown, the communication method specifically includes the following steps:

[0051] Step S210 , receiving a downlink data frame. The downlink data frame is sent from the control node 11 to each communication node 12 , including time slot sequencing information of uplink communication of each communication node 12 , which is used to indicate the time when the communication node 12 sends data to the control node 11 .

[0052] In an optional implementation, the downlink data frame also includes: data transmitted to the communication node 12, beacon, time synchronization information and / or time information of the next time the control node 11 sends the downlink data frame. The control node 11 can adjust the time of the next downlink data frame according to actual business needs to control the cycle of data exchange in the communication system. Optionally, after receiving the downlink data frame, the communication node 12 can perform time synchronization with the control node 11 according to the time synchronization information in the downlink data frame.

[0053] Step S220, determine the data transmission time according to the time slot sequence information. After determining the data transmission time of the node, the communication node 12 obtains the current time and determines whether the data transmission time has arrived. If the data transmission time has not arrived, step S230 is executed.

[0054] Step S230: In response to the data transmission time not being reached, entering a low-power sleep state. In the low-power sleep state, the communication node no longer maintains a communication connection with the outside world to minimize power consumption.

[0055] Step S240, in response to reaching the data transmission time, exit the low power sleep state and transmit uplink data. Optionally, depending on the terminal device, the uplink data may be environmental parameter data, biometric information data or device status information, etc., which is not limited in this embodiment.

[0056] The embodiment of the present invention receives a downlink data frame including time slot sorting information of uplink communication of a communication node, determines a data sending time according to the time slot sorting information, enters a low-power sleep state in response to failure to arrive at the data sending time, exits the low-power sleep state in response to arrival of the data sending time, and sends uplink data. Thus, low-power communication can be achieved based only on a data exchange process, thereby reducing power consumption of the communication process without requiring additional costs.

[0057] Figure 3FIG. 1 is a flow chart of another communication method according to an embodiment of the present invention. In an optional implementation, the communication node 12 executes the communication method shown in the figure. Figure 3 As shown, the communication method specifically includes the following steps:

[0058] Step S310, receiving a downlink data frame.

[0059] Step S320, determining the data sending time according to the time slot sorting information.

[0060] Step S330, determine whether it is time to send data. If it is time to send data, that is, the communication node 12 is the first in the time slot sequence information, there is no need to enter the low power sleep state, and directly execute step S351. If it is not time to send data, execute step S340.

[0061] Step S340, in response to the data transmission time not being reached, setting a first timer and entering a low power sleep state, wherein the first timer is triggered when the data transmission time is reached to prompt the communication node 12 to exit the low power sleep state.

[0062] Step S350, in response to the triggering of the first timer, exit the low power sleep state and send uplink data.

[0063] Step S351, in response to reaching the data sending time, sending uplink data.

[0064] Step S360, determining whether the time for the control node 11 to send a downlink data frame next time in the received downlink data frame has arrived. If the time for the control node 11 to send a downlink data frame next time has arrived, executing step S310 again, otherwise executing step S370.

[0065] Step S370, in response to the next time when the control node 11 sends a downlink data frame not arriving, setting a second timer and entering a low-power sleep state. The second timer is triggered when the next time when the control node 11 sends a downlink data frame arrives, so as to prompt the communication node 12 to exit the low-power sleep state.

[0066] Step S380, in response to the triggering of the second timer, exit the low power sleep state and execute step S310 again.

[0067] The embodiment of the present invention receives a downlink data frame including time slot sorting information of uplink communication of a communication node, determines the time to send data according to the time slot sorting information, enters a low-power sleep state in response to not reaching the time to send data, exits the low-power sleep state in response to reaching the time to send data, and sends uplink data, and after the sending is completed, enters the low-power sleep state again in response to not reaching the time for the next control node to send a downlink data frame, and wakes up through a timer. Thus, low-power communication can be achieved based only on the process of data exchange, and the power consumption of the communication process is reduced without additional cost.

[0068] Figure 4 FIG. 1 is a schematic diagram of the communication process of an embodiment of the present invention. Figure 4 As shown, the following description is made by taking the communication system including the control node 11, the communication node 121 and the communication node 122 as an example. Figure 4 The middle and high level part indicates that the node is sending data to the outside. During the communication process, the control node 11 sends a downlink data frame at t1-t2. At t1, the communication node 121 and the communication node 122 respond to the previously set timer trigger, exit the low-power sleep state, receive the downlink data frame, and judge whether the data transmission time has arrived at t2 when the data reception is completed. According to the time slot sorting information in the downlink data frame, the communication node 121 is ranked first. In response to the arrival of the time t2 when the node sends data, the communication node 121 directly sends the uplink data. At this time, the time t5 when the control node 11 sends the downlink data frame next time has not arrived, so it enters the low-power sleep state again at t3 when the data transmission is completed. At the same time, according to the time slot sorting information in the downlink data frame, the communication node 122 judges that the node does not send data at t2, sets the first timer and enters the low-power sleep state, waits until the node sends data at t3, the first timer is triggered, and the communication node 122 exits the low-power sleep state and sends uplink data. After the transmission is completed, in response to the current time not arriving for the next control node to transmit a downlink data frame, the low power consumption sleep state is re-entered at time t4. The above steps are repeated later and will not be described in detail here.

[0069] This embodiment receives a downlink data frame including time slot sorting information of uplink communication of a communication node, determines a data sending time according to the time slot sorting information, enters a low-power sleep state in response to failure to arrive at the data sending time, exits the low-power sleep state in response to arrival of the data sending time, and sends uplink data. Thus, low-power communication can be achieved based only on a data exchange process, thereby reducing power consumption of the communication process without requiring additional costs.

[0070] In actual business, communication nodes may not need to communicate for a long time. Therefore, further, the communication method of the embodiment of the present invention further includes: the control node 11 sends a sleep instruction to each communication node 12, and when it is necessary to wake up the communication node 12, it continuously sends a wake-up signal of a preset duration to each communication node. Among them, the sleep instruction includes a detection cycle, and the detection cycle is used to indicate the interval between two consecutive detections of the wake-up signal by the communication node 12. The preset duration is determined according to the detection cycle and is required to be at least not less than the detection cycle. The wake-up signal includes: an instruction to modify the detection cycle or a wake-up instruction.

[0071] Figure 5 FIG. 1 is a flow chart of a method for waking up from a dormant state according to an embodiment of the present invention. Figure 5 As shown, after receiving the sleep instruction from the control node 11, the communication node 12 performs the following steps:

[0072] Step S510 , in response to receiving a sleep instruction from the control node 11 , entering a low power sleep state.

[0073] Step S520, periodically detect the wake-up signal according to the detection cycle time. Specifically, every detection cycle time, the communication node 12 exits the low-power sleep state and detects whether there is a wake-up signal. If no wake-up signal is detected, it re-enters the low-power sleep state. If a wake-up signal is detected, step S530 is executed.

[0074] Step S530, determining whether the detected wake-up signal carries a wake-up instruction. If yes, executing step S550, otherwise executing step S540.

[0075] Step S540, in response to detecting a wake-up signal, and the wake-up signal carries an instruction to modify the detection cycle, modify the detection cycle and continue to maintain the low-power sleep state. After completion, execute step S520 again.

[0076] Step S550 , in response to detecting a wake-up signal, wherein the wake-up signal carries a wake-up instruction, exiting the low power sleep state.

[0077] Figure 6 FIG. 1 is a schematic diagram of a sleep state awakening process according to an embodiment of the present invention. Figure 6As shown, a communication system includes a control node 11, a communication node 121 and a communication node 122, and the preset duration is equal to the detection period. For the control node 11, the high level part indicates that the control node 11 is sending a wake-up signal. For each communication node, the high level part indicates that the communication node is detecting the wake-up signal at this time. After receiving the sleep instruction, the communication node 121 and the communication node 122 enter a low-power sleep state, and periodically exit the low-power sleep state according to the detection period to detect the wake-up signal. At time t1, the control node 11 continues to send a wake-up signal of a preset duration to each communication node until time t5. Since the preset duration is equal to the detection period, it can be guaranteed that the communication node can detect the wake-up signal at least once during this period. Due to the different times when the sleep instructions were previously received, communication node 121 and communication node 122 exit the low-power sleep state at t2 and t4, respectively, and detect the wake-up signal. If the wake-up signal carries the wake-up instruction, they exit the low-power sleep state. If the instruction to modify the detection cycle is carried, the detection cycle is modified, and they re-enter the low-power sleep state at t3 and t5, respectively, and periodically detect the wake-up signal according to the updated detection cycle.

[0078] This embodiment controls the communication node to enter a long-term low-power sleep state by sending a sleep instruction through the control node, and continuously sends a wake-up signal of a preset duration when the communication node needs to be awakened, thereby realizing long-term sleep and awakening of the communication node, reducing the power consumption of the communication process while avoiding the interference of the time drift caused by the crystal oscillator frequency deviation on the communication process. Furthermore, if the communication system does not have strict requirements on the communication delay, the preset duration can be configured to be greater than or equal to twice the detection period to maximize the avoidance of the communication node losing the wake-up signal due to accidental communication failure caused by external interference signals, further improving the stability of the system.

[0079] Figure 7 is a schematic diagram of a communication device according to an embodiment of the present invention. Further, an embodiment of the present invention also provides a communication device for deployment in a communication node, such as Figure 7 As shown, the communication device at least includes a receiving unit 71 and a state switching unit 72.

[0080] The receiving unit 71 is used to receive a downlink data frame sent by the control node, the downlink data frame including the time slot sequencing information of the communication node uplink communication. Optionally, the downlink data frame also includes: data transmitted to the communication node, beacon, time synchronization information and / or time information of the next time the control node sends a downlink data frame.

[0081] Furthermore, the communication device also includes a time synchronization unit, which is used to perform time synchronization with the control node according to time synchronization information in the downlink data frame when the receiving unit receives the downlink data frame.

[0082] The state switching unit 72 is used to determine the data sending time according to the time slot sorting information, and detect the current time to determine whether the data sending time has arrived. In response to not arriving the data sending time, the communication node is controlled to enter a low-power sleep state. In response to arriving the data sending time, the communication node is controlled to exit the low-power sleep state and send uplink data.

[0083] In an optional implementation, if the communication node is located at the first one in the time slot sorting information, the state switching unit 72 directly sends the uplink data and no longer controls the communication node to enter the low-power sleep state.

[0084] In an optional implementation, the state switching unit 72 implements switching to a low-power sleep state by setting a timer, specifically: in response to not reaching the time for sending data, setting a first timer, and controlling the communication node to enter a low-power sleep state, the first timer is triggered when the time for sending data is reached, to prompt the state switching unit 72 to control the communication node to exit the low-power sleep state and send uplink data.

[0085] In an optional implementation, the state switching unit 72 is also used to determine whether the time for the next control node to send a downlink data frame has arrived after sending the uplink data. In response to the time for the next control node to send a downlink data frame not arriving, a second timer is set and the low-power sleep state is entered. The second timer is triggered when the time for the next control node to send a downlink data frame arrives, so as to prompt the state switching unit 72 to control the communication node to exit the low-power sleep state.

[0086] In an optional implementation, the receiving unit 71 is also used to receive a sleep instruction and a wake-up signal sent by the control node. The state switching unit 72 is also used to control the communication node to enter a low-power sleep state when receiving a sleep instruction from the control node, and periodically exit the low-power sleep state according to the detection cycle in the sleep instruction, so that the receiving unit 71 detects the wake-up signal. If the receiving unit 71 detects a wake-up signal, and the wake-up signal carries an instruction to modify the detection cycle, the state switching unit 72 modifies the detection cycle and re-enters the low-power sleep state. If the receiving unit 71 detects a wake-up signal, and the wake-up signal carries a wake-up instruction, the state switching unit 72 controls the communication node to exit the low-power sleep state.

[0087] This embodiment receives a downlink data frame including time slot sorting information of uplink communication of a communication node, determines a data sending time according to the time slot sorting information, enters a low-power sleep state in response to failure to arrive at the data sending time, exits the low-power sleep state in response to arrival of the data sending time, and sends uplink data. Thus, low-power communication can be achieved based only on a data exchange process, thereby reducing power consumption of the communication process without requiring additional costs.

[0088] The embodiment of the present invention further provides a communication node, which includes at least a processor and a memory, wherein the processor and the memory are connected via a bus, and the processor may be an independent microprocessor or a collection of one or more microprocessors. Thus, the processor executes the communication method flow of the embodiment of the present invention as described above by executing the instructions stored in the memory, thereby realizing low-power communication.

[0089] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices (equipment) or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may adopt a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0090] The present application is described with reference to flowcharts of methods, apparatuses (devices) and computer program products according to embodiments of the present application. It should be understood that each process in the flowchart can be implemented by computer program instructions.

[0091] These computer program instructions may be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device that implements the process Figure 1 A function specified in a process or multiple processes.

[0092] These computer program instructions may also be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce the instructions for implementing the process Figure 1 A device that specifies functions in a process or multiple processes.

[0093] Another embodiment of the present invention relates to a non-volatile storage medium for storing a computer-readable program, wherein the computer-readable program is used for a computer to execute part or all of the above method embodiments.

[0094] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by specifying relevant hardware through a program, and the program is stored in a storage medium, including several instructions for a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0095] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A communication method, applicable to a communication node, characterized in that: The method comprises: Receiving a downlink data frame, wherein the downlink data frame includes time slot sequencing information of uplink communication of the communication node; Determine the data transmission time according to the time slot sorting information; In response to not reaching the data sending time, entering a low power consumption sleep state; In response to reaching the data sending time, exiting the low power sleep state and sending uplink data.

2. The method according to claim 1, characterized in that In response to the data transmission time not being reached, entering the low power sleep state includes: in response to the data transmission time not being reached, setting a first timer and entering the low power sleep state, wherein the first timer is used to prompt that the data transmission time has arrived; The step of exiting the low-power sleep state and sending uplink data in response to reaching the data sending time includes: exiting the low-power sleep state and sending the uplink data in response to the first timer being triggered.

3. The method according to claim 1, characterized in that The downlink data frame also includes: data transmitted to the communication node, a beacon, time synchronization information and / or time information of the next time the control node sends the downlink data frame.

4. The method according to claim 3, characterized in that After receiving the downlink data frame, the method further includes: Time synchronization is performed according to the time synchronization information.

5. The method according to claim 3, characterized in that: After sending the uplink data, the method further includes: In response to the next time when the control node sends a downlink data frame not arriving, setting a second timer according to the time information of the next time when the control node sends a downlink data frame, and entering the low-power sleep state; In response to the second timer being triggered, the low power sleep state is exited.

6. The method according to claim 1, characterized in that The method further comprises: Entering the low-power sleep state in response to receiving a sleep instruction from a control node, the sleep instruction including a detection cycle; Periodically detecting a wake-up signal according to the detection period; In response to detecting the wake-up signal, and the wake-up signal carries an instruction to modify the detection cycle, modifying the detection cycle and continuing to maintain the low-power sleep state; In response to detecting the wake-up signal, wherein the wake-up signal carries a wake-up instruction, exiting the low-power sleep state.

7. The method according to claim 1, characterized in that When the communication node is located at the first one of the time slot sorting information, the method comprises: Receiving a downlink data frame, wherein the downlink data frame includes time slot sequencing information of uplink communication of the communication node; Determine the data transmission time according to the time slot sorting information; In response to reaching the data sending time, uplink data is sent.

8. A communication node, characterized in that: The communication node is configured to perform the method according to any one of claims 1-7.

9. A communication system, characterized in that: The communication system comprises: At least one communication node, configured to perform the method according to any one of claims 1 to 7; Control node: configured to send downlink data frames to the at least one communication node and receive uplink data sent by the at least one communication node.

10. The system according to claim 9, characterized in that The control node is further configured to: Sending a sleep instruction to the at least one communication node, the sleep instruction including a detection period; A wake-up signal of a preset duration is continuously sent to the at least one communication node, where the preset duration is not less than the detection period, and the wake-up signal includes: an instruction to modify the detection period or a wake-up instruction.

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