Method for multi-hop coordination sleep in the field of power equipment internet of things

Abstract

The present application relates to the technical field of power equipment internet of things, especially to a multi-hop coordination sleep method in the field of power equipment internet of things, which comprises the following steps: a power equipment internet of things access node broadcasts access control information to terminal equipment in the network on a specific channel in a timing manner, the message contains a frame sequence number, a sleep duration and a sleep frame sequence number, and the specific channels form a specific frequency point list; a sink node and a communication terminal maintain a sleep cycle, and after each wake-up, scanning is performed on the specific channel to attempt to receive a broadcast frame, and if the broadcast frame can be received on the channel, the method is used. In the present application, the multi-hop coordination sleep method in the field of power equipment internet of things uses the frame sequence number, the sleep frame sequence number and the sleep duration in the broadcast frame to effectively reduce the power consumption of the equipment by synchronously sleeping, and provides effective and reliable wireless communication connection through the methods of continuous broadcast after wake-up and periodic wake-up access in the unconnected state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment Internet of Things, in particular to a multi-hop coordination sleep method in the field of power equipment Internet of Things. BACKGROUND

[0002] The power equipment Internet of Things is the application of the Internet of Things in the smart grid, and is the result of the development of information communication technology to a certain stage. It will effectively integrate communication infrastructure resources and power system infrastructure resources, improve the information level of the power system, improve the utilization efficiency of the existing infrastructure of the power system, and provide important technical support for the power generation, transmission, transformation, distribution and power utilization links of the power grid.

[0003] In the power equipment Internet of Things, the sensor terminal equipment sends the collected data to the base station, which mainly belongs to the perception layer. At present, China mainly uses optical fiber communication and other ways to collect and monitor data, and some businesses use power line carrier or wireless communication methods.

[0004] The power Internet of Things equipment has a relatively complex working environment, and many devices need to be powered by batteries for long-term power supply. Because of the geographical location and working environment, it is impossible to provide external power supply to them, and the cost of replacing the battery is also extremely high. Therefore, a low-power and reliable multi-hop coordination sleep method is a key requirement for their continuous work. However, the multi-hop nodes currently used do not have the ability to sleep, and cannot meet the low-power requirements of power equipment, especially in the power transmission Internet of Things communication scenario. If the power consumption is large, it is easy to cause the communication link to be unstable. Therefore, the present application proposes a multi-hop coordination sleep method in the field of power equipment Internet of Things. SUMMARY

[0005] The purpose of the present application is to provide a multi-hop coordination sleep method in the field of power equipment Internet of Things, which has the advantages of effectively reducing device power consumption and ensuring stable and reliable links, and solves the problems raised in the background technology.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: a multi-hop coordination sleep method in the field of power equipment Internet of Things, which comprises the following steps:

[0007] S1: The power equipment Internet of Things access node broadcasts access control information to the terminal equipment in the network at a certain time on a certain channel, and the message contains the frame number, the sleep duration, the sleep frame number, and the specific channel group forms a specific frequency point list;

[0008] S2: The sink node and the communication terminal maintain a sleep cycle, and after each wake-up, they scan on the specific channel and try to receive the broadcast frame. If the broadcast frame can be received on these channels, the channels are sorted according to a certain method, and then random access is performed on these channels in turn;

[0009] S3: If the access succeeds, the sink node receives the frame sequence number in the broadcast frame after the communication terminal wakes up, and inherits the frame sequence number to construct its own broadcast frame, and broadcasts the frame sequence number by one each time in another channel. When it is checked that the sleep frame sequence number in the broadcast frame is the same as the frame sequence number, the sink node first sends out its own broadcast frame, and sleeps for the sleep duration in the broadcast frame;

[0010] S4: When the access node ends the sleep, it continues to broadcast the previous frame sequence number. When the sink node ends the sleep, it first continues to broadcast for 10 frames. If the broadcast of the parent node is received within 10 frames, the sink node continues to broadcast synchronously. If the broadcast of the parent node is not received, the sink node enters the frequency scanning random access state. If the access fails, the sink node sleeps immediately.

[0011] Further, as a preferred embodiment of the present application, in S1, the broadcast frame comprises the current frame sequence number, the sleep duration, and the sleep frame sequence number.

[0012] Further, as a preferred embodiment of the present application, in S1, after the sensor terminal device wakes up, if it is found that the broadcast message cannot be received, the sensor terminal device scans a specific channel in the frequency point list. After the scanning ends, the signal-to-noise ratio of the signal is weighted and sorted according to the received signal strength indicator (RSSI) and the number of hops. Then, the channel is selected for access.

[0013] Further, as a preferred embodiment of the present application, in S1, after the access, the base station sends the sleep time (DRX cycle) to the terminal device. After the terminal device receives the DRX message, the frame sequence number in the current broadcast message is recorded, the terminal device sleeps, and wakes up again after a set time.

[0014] Further, as a preferred embodiment of the present application, in S2, if the random access fails or the broadcast frame is not received on the specific channel, the device sleeps immediately, and wakes up the device in the next wake-up cycle, and then accesses again in the above-mentioned manner.

[0015] Further, as a preferred embodiment of the present application, in S2, the sink node maintains a fixed sleep cycle T in the unaccessed state. When it wakes up, it performs frequency scanning and random access. The total time of the frequency scanning and the random access is T2, and T2 is less than T / 2.

[0016] Further, as a preferred embodiment of the present application, in S3, the sink node receives the current frame sequence number Fc, the sleep frame sequence number Fs, and the sleep duration St after receiving the broadcast frame of the access node in the synchronous sleep mode after the access succeeds.

[0017] Further, as a preferred embodiment of the present application, in S4, after wake-up, the access node broadcasts according to the frame sequence number before sleep + the frame sequence number theoretically skipped during the sleep time, for example, the frame sequence number before sleep is 60, the sleep time is 9 minutes, and if the frame duration is 1s, then the first frame sequence number after sleep is 601.

[0018] The technical scheme of the present application has the following technical effects: the present application has the advantages of effectively reducing device power consumption and ensuring link stability and reliability, by adopting two sleep modes, the first mode is that after the device has registered access to the network, the access node broadcasts the sleep time and the sleep frame sequence number, since the frame sequence numbers are synchronized in the multi-hop link, the sink node and the communication terminal can sleep according to the sleep frame sequence number and the sleep time after receiving the broadcast frame; the second mode is that when the sink node and the communication terminal are not accessed to the network, a period is maintained for wake-up, after wake-up, the frequency point list is scanned, and the broadcast frame is tried to be received, if the broadcast frame is received, random access is performed, and then the access node is synchronized to sleep and wake-up according to the first mode, if the broadcast frame cannot be received or the random access fails, sleep is immediately performed, and the frequency scanning and access attempt are performed again in the next period, by using the two sleep and wake-up modes, not only the smoothness and reliability of the link can be ensured, but also the device power consumption is greatly reduced, thus meeting the complex environmental changes and low power consumption requirements of the power equipment Internet of Things.

[0019] The multi-hop coordinated sleep mode in the field of power equipment Internet of Things in the present application uses the frame sequence number, the sleep frame sequence number and the sleep time in the broadcast frame to perform synchronized sleep, which effectively reduces the device power consumption, and by using the mode of continuous broadcast after wake-up and periodic wake-up access in the state of not being accessed, an effective and reliable wireless communication connection is provided.

[0020] It should be understood that all combinations of the aforementioned concepts and additional concepts described in greater detail below can be seen as part of the subject matter of the present disclosure as long as such concepts are not mutually inconsistent. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0022] Figure 1 Flow chart of working process after wake-up of power terminal device. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. In order to understand the technical contents of the present application more clearly, specific embodiments are shown and described below with reference to the accompanying drawings. The aspects of the present application are described in the present disclosure with reference to the drawings, and many illustrated embodiments are shown in the drawings. It should be understood that the various concepts and embodiments introduced above, and those described in more detail below, can be implemented in any of a number of ways. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0024] Embodiment one:

[0025] A method for multi-hop coordination sleep in the field of power equipment Internet of Things, the method comprising the following steps:

[0026] S1: The power equipment Internet of Things access node broadcasts access control information to the terminal device in the network at a certain channel timing, the message contains frame sequence number, sleep duration, sleep frame sequence number, and these certain channel groups form a certain frequency point list;

[0027] Further, in S1, the broadcast frame contains the current frame sequence number, sleep duration, sleep frame sequence number, and the current frame sequence number of all nodes that have accessed the network must be synchronized to prevent each node from having different sleep times due to different frame sequence numbers.

[0028] Further, in S1, after the sensor terminal device wakes up, if it finds that it cannot receive the broadcast message, it will scan the certain channel inside the frequency point list, and after the scanning is completed, the signal-to-noise ratio of the signal is weighted and sorted according to the received signal strength RSSI and the number of hops, and then the channel is selected for access.

[0029] Further, in S1, after access, the base station sends the sleep time DRX cycle to the terminal device, and after the terminal receives the DRX message, it records the frame sequence number in the current broadcast message, enters sleep, and wakes up again after a set time.

[0030] S2: The aggregation node and the communication terminal maintain a sleep cycle, and after each wake-up, they scan the certain channel and try to receive the broadcast frame, if the broadcast frame can be received on these certain channels, the channels are sorted in a certain way, and random access is performed on these channels in turn;

[0031] Further, in S2, if the random access fails or no broadcast frame is received on these certain channels, the device will immediately sleep and wake up the device at the next wake-up cycle, and then access again in the above manner.

[0032] Further, in S2, the sink node will maintain a fixed sleep cycle T in the unconnected state, and will perform frequency sweeping and random access when waking up. The total time of frequency sweeping and random access is T2, which is less than T / 2. If the random access is successful or the frequency sweeping does not receive a signal, the sleep time is Ts = T - T2.

[0033] S3: If the sink node successfully accesses after the communication terminal wakes up, it will receive the frame sequence number in the broadcast frame and inherit the frame sequence number to construct its own broadcast frame, which is broadcast to another channel. The frame sequence number is incremented by one each time. When it is found that the sleep frame sequence number in the broadcast frame is the same as the frame sequence number, the sink node will first send its own broadcast frame and sleep for the sleep time in the broadcast frame.

[0034] Further, in S3, after the sink node successfully accesses, the sink node will receive the current frame sequence number Fc, the sleep frame sequence number Fs, and the sleep time St after receiving the broadcast frame of the access node. Since the sink node and the access node are back-to-back, the time length of the broadcast frame is different by half a frame. Therefore, if the frame sequence numbers on the link are to be synchronized, the frame sequence number needs to be inherited according to the hop number of the current node. If the access node is the 0th hop, the broadcast frame Fc of the node located on the odd hop number will be incremented by one, and the broadcast frame Fc of the node located on the even hop number will be the same as the Fc received from the previous hop.

[0035] S4: After the access node ends the sleep, it will continue to broadcast the previous frame sequence number. After the sink node ends the sleep, it will first continue to broadcast for 10 frames. If the broadcast of the parent node is received within 10 frames, the sink node will continue to broadcast synchronously. If the broadcast of the parent node is not received, the sink node will enter the frequency sweeping and random access state. If the access fails, the sink node will immediately sleep.

[0036] Further, in S4, after waking up, the access node will broadcast according to the frame sequence number before sleep + the frame sequence number theoretically skipped during the sleep time. For example, if the frame sequence number before sleep is 60 and the sleep time is 9 minutes, and if the time length of one frame is 1 s, the first frame sequence number of the broadcast frame after sleep is 601. Since the nodes are synchronized before sleep, the sink node will theoretically continue to receive the broadcast frame of the access node after waking up. To avoid synchronization errors, the sink node is required to first automatically continue the frame sequence number before sleep to broadcast after waking up. At the same time, the sink node receives the broadcast frame of the parent node. If the broadcast frame of the parent node is received within 10 frames, the sink node will continue to sleep synchronously. If the broadcast frame of the parent node is not received within 10 frames, the sink node will stop its own broadcast and end the synchronization state, and enter the frequency sweeping and random access state. If the access fails, the sink node will immediately sleep.

[0037] Embodiment Two

[0038] A method for multi-hop coordination sleep in the field of power equipment Internet of Things, given an access scenario of one sink node and one access node, a frame length of 250 ms, and the specific sleep and wake-up steps as follows:

[0039] 1) The access node works and wakes up and sleeps every 10 minutes, works for 1 minute after each wake-up, and sleeps for 9 minutes;

[0040] 2) After the sink node wakes up, if it is currently in an unconnected state, it will scan the frequency point list and receive the broadcast, each list is scanned for 2 frames of 500 ms, the frequency point list contains 5 frequency points, so the scanning time is 2.5 s, if no broadcast is received after scanning is completed, it will immediately enter sleep for 40-2.5=37.5 s;

[0041] 3) If a broadcast frame is received on a frequency point after scanning, random access will be performed on the frequency point, the process will be retransmitted twice, each time waiting for an ACK for 5 s, if random access fails, the waiting time is 10 s, so the immediate sleep time is 40-10-2.5=27.5 s;

[0042] 4) If random access is successful, the sink node will receive the broadcast frame of the access node, assuming that the sleep frame number Fs=100 and the sleep time St=540 s, when the sink node receives the broadcast frame, it finds that Fc=60, it will check its hop number, if the hop number is odd, it will add 1, i.e. 61, to its own broadcast frame, and broadcast downward, if the hop number is even, it will directly broadcast Fc=60;

[0043] 5) When the sink node receives Fc=100, if the node hop number is odd, it will immediately enter sleep, if it is even, it will send its own broadcast frame and then enter sleep;

[0044] 6) After the sink node wakes up, it will check whether it has received the parent node broadcast, if it has received it, it will continue the previous logic to broadcast downward; if it has not received it, it will broadcast Fc=2261 by itself, if it does not receive the parent node broadcast within 10 frames, it will stop its own broadcast and enter the frequency scanning stage.

[0045] In summary, the application has the advantages of effectively reducing the power consumption of the device and ensuring the stability and reliability of the link. By adopting two sleep modes, in the first mode, after the device has registered access to the network, the access node broadcasts the sleep duration and sleep frame number, and since the frame numbers are synchronized in the multi-hop link, the sink node and the communication terminal can sleep according to the sleep frame number and the sleep duration after receiving the broadcast frame; in the second mode, when the sink node and the communication terminal are not connected to the network, a period is maintained for wake-up, after wake-up, the frequency point list is scanned, and the broadcast frame is tried to be received, if the broadcast frame is received, random access is performed, and then the sink node and the communication terminal are synchronized with the access node to sleep and wake up according to the first mode, if the broadcast frame cannot be received or the random access fails, the sink node and the communication terminal immediately sleep, and in the next period, the sink node and the communication terminal are woken up again to scan the frequency and try to access, by using the two sleep and wake-up modes, the smoothness and reliability of the link can be ensured, and the power consumption of the device is greatly reduced, thus meeting the complex environmental changes and low power consumption requirements of the power equipment Internet of Things.

[0046] It should be noted that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

[0047] Although the present application has been disclosed in the above preferred embodiments, it is not intended to limit the present application. Those skilled in the art can make various modifications and improvements without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. A method for multi-hop coordination sleep in the field of power device Internet of Things, characterized in that: The method comprises the following steps: S1: the power equipment Internet of Things access node broadcasts access control information to the terminal equipment in the network at a specific channel timing, the message contains frame sequence number, sleep duration, sleep frame sequence number, and the specific channel forms a specific frequency point list; S2: the convergence node and the communication terminal maintain a sleep cycle, after each wake-up, scanning is performed on the specific channel to attempt to receive the broadcast frame, if the broadcast frame can be received on the channel, the channel is sorted according to a certain method, and random access is performed on the channel in turn; S3: if the communication terminal succeeds in accessing after wake-up, the frame sequence number in the broadcast frame is received, and the frame sequence number is inherited to construct a broadcast frame of the own, the broadcast frame is broadcasted on another channel, the frame sequence number is increased by one, when it is found that the sleep frame sequence number in the broadcast frame is the same as the frame sequence number, the broadcast frame of the own is first sent out, and sleep is performed according to the sleep duration in the broadcast frame; S4: when the access node ends sleep, the previous frame sequence number is continued to broadcast, when the convergence node ends sleep, the broadcast is first continued for 10 frames, if the broadcast of the parent node is received within 10 frames, the broadcast is continued to be synchronized, if the broadcast of the parent node is not received, the frequency scanning random access state is entered, and access failure causes the device to sleep immediately. 2.The method for multi-hop coordination sleep of power device Internet of Things field according to claim 1, characterized in that: In S1, the broadcast frame contains the current frame sequence number, sleep duration and sleep frame sequence number. 3.The method of claim 1, wherein: In S1, after the sensor terminal equipment wakes up, if it is found that the broadcast message cannot be received, scanning is performed on the specific channel in the frequency point list, after the scanning ends, the signal-to-noise ratio of the signal is weighted and sorted according to the received signal strength RSSI and the number of hops, and then the channel is selected for access.

4. The method of claim 1, wherein the method is characterized by: In S1, after access, the base station sends the sleep time (DRX cycle) to the terminal equipment, after the terminal receives the DRX message, the frame sequence number in the current broadcast message is recorded, sleep is entered, and the device is woken up again after a set time.

5. The method of claim 1, wherein: In S2, if random access fails or no broadcast frame is received on the specific channel, the device is immediately put to sleep, and the device is woken up again in the next wake-up cycle and then accessed according to the above method.

6. The method of claim 1, wherein the method is used in the field of Internet of Things (IoT) for power devices. In S2, the convergence node maintains a fixed sleep cycle T in the non-access state, performs frequency scanning and random access when woken up, and the total time of frequency scanning and random access is T2, which is less than T / 2.

7. The method of claim 1, wherein the method is used in the field of Internet of Things (IoT) for power devices. In S3, after successful access, the synchronization sleep mode, after the convergence node receives the broadcast frame of the access node, the current frame sequence number Fc, the sleep frame sequence number Fs and the sleep duration St are received.

8. The method of claim 1, wherein the method is used in the field of Internet of Things (IoT) for power devices. In S4, after wake-up, the access node broadcasts according to the frame sequence number before sleep + the frame sequence number theoretically skipped during sleep time, for example, the frame sequence number before sleep is 60, and the sleep duration is 9 minutes, if the duration of one frame is 1s, the frame sequence number of the first frame broadcasted after sleep is 601.

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