CN111328058A - A dynamic wake-up method for Bluetooth Mesh low-power nodes - Google Patents

Abstract

The invention discloses a dynamic awakening method of a Bluetooth Mesh low-power consumption node, which mainly comprises the following two aspects: firstly, a data packet sent by a friend node to a low power consumption node (LPN) carries synchronous clock information incidentally, and the low power consumption node (LPN) carries out clock synchronization every time the low power consumption node (LPN) receives data; the friend node can synchronously update the dynamic awakening time of the low-power-consumption node, and can send data to the low-power-consumption node without sending an inquiry data packet by the low-power-consumption node; secondly, the low-power consumption node is in an awakening state; in the awakening period, if new information is received, processing is carried out, and then awakening time is gradually reduced; if no new information is received, the wake-up time is gradually increased. The invention can synchronously update the clocks of the low power consumption node (LPN) and the friendly node and the dynamic awakening time of the low power consumption node, reduce the sending of the data packet of the low power consumption node and further reduce the power consumption in the Bluetooth Mesh networking process.

Description

A dynamic wake-up method for Bluetooth Mesh low-power nodes

technical field

The invention relates to the technical field of wireless communication, in particular to a method for awakening a Bluetooth Mesh low-power node.

Background technique

In a wireless mesh network, any wireless device node can act as an AP and a router at the same time, each node in the network can send and receive signals, and each node can communicate directly with one or more peer nodes.

The biggest benefit of the wireless mesh network structure is that if the nearest AP is congested due to excessive traffic, the data can be automatically re-routed to a neighboring node with less traffic for transmission. And so on, the data packet can also continue to be routed to the next closest node for transmission according to the network conditions until it reaches the final destination.

The relationship between Bluetooth low energy and Bluetooth Mesh: Bluetooth Mesh is a network technology, Bluetooth Mesh network relies on Bluetooth low energy, and Bluetooth low energy technology is the wireless communication protocol stack used by Bluetooth Mesh.

There are three main types of BLE working modes: broadcast, scan and connect. In order to ensure the accuracy of data transmission, there are two improved schemes: one is to increase the scan window time to make the scan coverage larger; the other is to set the broadcast interval to be smaller than the scan window time, so that there must be broadcast data within the scan window time period . However, both schemes have drawbacks. If the scan time is too long or the broadcast interval is too short, the wake-up time will increase, which will increase the power consumption of BLE; while the BLE device with connected communication needs to maintain the connection regularly, reducing the connection interval and increasing the number of connected devices will lead to an increase in BLE connection events. As a result, the power consumption of the BEL increases.

The purpose of the present invention is to provide a dynamic wake-up method for a Bluetooth Mesh low-power node. When needed, the low-power node (LPN) can dynamically change from the sleep state to the response state, establish a network connection with the friend node, and perform the process of data transmission and reception. After the data transmission is completed, the low-power node (LPN) automatically enters a sleep state. In this way, data transmission is achieved, and there is no need to scan forever online, thereby saving the power consumption of nodes.

SUMMARY OF THE INVENTION

Purpose of the invention: The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a Bluetooth Mesh low-power node dynamic wake-up method, thereby further reducing the power consumption in the Bluetooth Mesh networking process. Delay factors such as the reception delay of the power consumption node (LPN) and the reception window.

Technical scheme: in order to realize the above-mentioned purpose, the technical method provided by the present invention is as follows:

A method for dynamically awakening a Bluetooth Mesh low-power node, comprising the following steps:

S101: In a Bluetooth Mesh networking system, a user sends an operation command to the system from a control terminal according to his own needs;

S102: the system receives the instruction and sends the instruction to the friend node;

S103: The friend node temporarily stores the instruction received from the system;

S104: The friend node establishes a "friendship" relationship with the LPN, and establishes a data transmission channel;

S105: After updating the synchronization clock and the wake-up time, the friend node sends data information to the LPN whose wake-up time is up, and the data information includes the pending command, the synchronization clock, and the count value N, etc.;

S106: The friend node and the LPN update the synchronization clock;

S107: The LPN judges whether data is received, if the LPN does not receive the data, skip to step S108, and if the LPN receives the data, skip to step S109;

S108: The LPN judges whether its own sleep time is not less than the longest sleep time. If the LPN's own sleep time is less than the longest sleep time, it will jump to step S1081; if the LPN's own sleep time is not less than the longest sleep time, it will jump to step S1082;

The step S1081 is: the sleep time of the LPN is increased by 2 times of the existing sleep time, that is, the existing sleep time is multiplied by 2, and the counting function N+1 is executed, wherein the initial value N=0; skip to step S113;

The step S1082 is: the LPN keeps the longest sleep time, and jumps to step S113;

S109: Receive the information and process it, and then synchronize the time between the LPN and the system;

S110: The LPN judges whether its own sleep time is not greater than the shortest sleep time. If the LPN's own sleep time is greater than the shortest sleep time, it will jump to step S1101; if the LPN's own sleep time is not greater than the shortest sleep time, it will jump to step S1102;

The step S1101 is as follows: the sleep time of the LPN is reduced to 50% of the existing sleep time, that is, the existing sleep time is multiplied by 0.5; the counting function N-1 is executed, wherein the initial value N=0; jump to step S111;

The step S1102 is: the LPN maintains the shortest sleep time;

S111: The LPN records its own remaining power;

S112: The LPN sends data information to the friend node;

S113: Determine whether the friend node has received data during the wake-up period, if no data is received, skip to step S1131, and if data is received, skip to step S1132;

The step S1131 is: the count value N at the friend node is increased by 1, and when the maximum value N=4 is reached, the maximum value is maintained; skip to step S105 to start the next round of processing;

The step S1132 is as follows: the count value N at the friend node is decremented by 1, and when the minimum value N=0 is reached, the minimum value is maintained; step S105 is jumped to start the next round of processing.

Further, a Bluetooth Mesh networking system in the step S101, the system is composed of several users, system background, several relay gateway nodes, several friend nodes and several low-power nodes, and has both sending and receiving functions. And the function of information processing, the described Bluetooth Mesh networking system includes the following steps:

S21: The user sends an operation command from the control terminal to the system background according to his own needs; the user terminal also receives the information from the system background;

S22: the system background receives the instruction from the user and sends the instruction to the relay gateway node; the relay gateway node gives feedback to the system background according to the instruction sending result;

S23: The relay gateway node receives the instruction from the system background and sends the instruction to the friend node; the friend node gives feedback to the relay gateway node according to the instruction sending result;

S24: The friend node receives the instruction, and after establishing a "friendship" relationship with the low power consumption node (LPN), sends a data packet to the low power consumption node (LPN). The data information includes commands to be processed, the synchronization clock, and the count value N, etc.; the processed data information is received from the low-power node (LPN);

S25: The low-power node (LPN) uses the received data packet to synchronize the clock, and uses the count value to synchronize the wake-up period; when the LPN wake-up time is up, it receives the data from the friend node, and after the data processing is completed, the low-power node (LPN) Record the count value and feed it back to the friend node for synchronous update and wake-up cycle.

Further, the initial value N=0 described in step S1081 and step S1101, if the LPN has received information, then carry out N+1 count, if the LPN has no information received, carry out N-1 count, the value range of N is 0 ≤N≤4; set the sleep time before LPN has information judgment as T (unit: seconds), and the sleep time in the initial state of LPN as the shortest sleep time of 0.1 seconds, then the sleep time of LPN before performing a power recording operation is T = 0.1 × 2 ^N (s).

Further, the system has the functions of sending, receiving and information processing, and the specific functions are as follows:

A: In terms of sending, after the user sends an instruction, the system background processes the user information, and sends the information to the relay gateway node, friend node, and finally to the low-power node (LPN);

B: In terms of reception, the networking system mainly includes users, system backgrounds, relay gateway nodes, friend nodes, and low-power nodes (LPNs). , with the help of data packets and count values for clock synchronization and update of the wake-up period.

Beneficial effect: the present invention does not require the low-power node to scan for a long time whether there is channel information, and increases or decreases the sleep time according to the presence or absence of the previous hop information through the dynamic window, which improves the work efficiency during the working time, and thus consumes power. And the feedback overhead is small, the algorithm complexity is low, and it is suitable for further reducing the power consumption of the low-power Bluetooth mesh network.

Description of drawings

1 is a schematic flowchart of a method for dynamically waking up a Bluetooth Mesh low-power node according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a Bluetooth Mesh networking system and a timing sequence of a receiving delay and a receiving window according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below, so that those skilled in the art can better understand the advantages and features of the present invention, and thus make a clearer definition of the protection scope of the present invention. The described embodiments of the present invention are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work For example, all belong to the protection scope of the present invention.

Figure 1 shows a dynamic wake-up method for a Bluetooth Mesh low-power node, which includes the following steps:

S101: In a Bluetooth Mesh networking system, a user sends an operation command to the system from a control terminal according to his own needs;

S102: the system receives the instruction and sends the instruction to the friend node;

S103: The friend node temporarily stores the instruction received from the system;

S104: The friend node establishes a "friendship" relationship with the LPN, and establishes a data transmission channel;

S105: After updating the synchronization clock and the wake-up time, the friend node sends data information to the LPN whose wake-up time is up, and the data information includes the pending command, the synchronization clock, and the count value N, etc.;

S106: The friend node and the LPN update the synchronization clock;

S107: The LPN judges whether data is received, if the LPN does not receive the data, skip to step S108, and if the LPN receives the data, skip to step S109;

S108: The LPN judges whether its own sleep time is not less than the longest sleep time. If the LPN's own sleep time is less than the longest sleep time, it will jump to step S1081; if the LPN's own sleep time is not less than the longest sleep time, it will jump to step S1082;

The step S1081 is: the sleep time of the LPN is increased by 2 times of the existing sleep time, that is, the existing sleep time is multiplied by 2, and the counting function N+1 is executed, wherein the initial value N=0; skip to step S113;

The step S1082 is: the LPN keeps the longest sleep time, and jumps to step S113;

S109: Receive the information and process it, and then synchronize the time between the LPN and the system;

S110: The LPN judges whether its own sleep time is not greater than the shortest sleep time. If the LPN's own sleep time is greater than the shortest sleep time, it will jump to step S1101; if the LPN's own sleep time is not greater than the shortest sleep time, it will jump to step S1102;

The step S1101 is as follows: the sleep time of the LPN is reduced to 50% of the existing sleep time, that is, the existing sleep time is multiplied by 0.5; the counting function N-1 is executed, wherein the initial value N=0; jump to step S111;

The step S1102 is: the LPN maintains the shortest sleep time;

S111: The LPN records its own remaining power;

S112: The LPN sends data information to the friend node;

S113: Determine whether the friend node has received data during the wake-up period, if no data is received, skip to step S1131, and if data is received, skip to step S1132;

The step S1131 is: the count value N at the friend node is increased by 1, and when the maximum value N=4 is reached, the maximum value is maintained; skip to step S105 to start the next round of processing;

The step S1132 is as follows: the count value N at the friend node is decremented by 1, and when the minimum value N=0 is reached, the minimum value is maintained; step S105 is jumped to start the next round of processing.

Wherein, the initial value N=0 described in step S1081 and step S1101, if the LPN has received information, then carry out N+1 count, if the LPN has no information received, carry out N-1 count, and the value range of N is 0≤ N≤4; set the sleep time before the judgment of whether the LPN has information as T (unit: seconds), and the sleep time in the initial state of the LPN as the shortest sleep time of 0.1 seconds, then the sleep time of the LPN before performing a power recording operation is T = 0.1 ×2 ^N (s).

The system has the functions of sending, receiving and information processing, and the specific functions are as follows:

A: In terms of sending, after the user sends an instruction, the system background processes the user information, and sends the information to the relay gateway node, friend node, and finally to the low-power node (LPN);

B: In terms of reception, the networking system mainly includes users, system backgrounds, relay gateway nodes, friend nodes, and low-power nodes (LPNs). , with the help of data packets and count values for clock synchronization and update of the wake-up period.

As shown in Figure 2, a Bluetooth Mesh networking system includes the following steps:

S21: The user sends an operation command from the control terminal to the system background according to his own needs; the user terminal also receives the information from the system background;

S22: the system background receives the instruction from the user and sends the instruction to the relay gateway node; the relay gateway node gives feedback to the system background according to the instruction sending result;

S23: The relay gateway node receives the instruction from the system background and sends the instruction to the friend node; the friend node gives feedback to the relay gateway node according to the instruction sending result;

S24: The friend node receives the instruction, and after establishing a "friendship" relationship with the low power consumption node (LPN), sends a data packet to the low power consumption node (LPN). The data information includes commands to be processed, the synchronization clock, and the count value N, etc.; the processed data information is received from the low-power node (LPN);

S25: The low-power node (LPN) uses the received data packet to synchronize the clock, and uses the count value to synchronize the wake-up period; when the LPN wake-up time is up, it receives the data from the friend node, and after the data processing is completed, the low-power node (LPN) Record the count value and feed it back to the friend node for synchronous update and wake-up cycle.

According to a Bluetooth Mesh low-power node dynamic wake-up method shown in Figure 1, a design example is proposed. The shortest sleep time of the low-power node (LPN) is set to 0.1 seconds, and the longest sleep time is 2 seconds. If the LPN has information to be received, the LPN reduces the sleep time step by step, and each time it is reduced to 50% of the existing sleep time, that is, the existing sleep time is multiplied by 0.5, and the longest sleep time can be reduced to the shortest sleep time after a maximum of 5 times. Time; if the LPN has no information to receive, the LPN will increase the sleep time step by step, each time increasing by 2 times the existing sleep time, that is, multiplying the existing sleep time by 2, then the maximum sleep time can be increased from the shortest sleep time to the maximum after 5 times. Long sleep time.

The description and practice disclosed in the present invention are easy to think and understand for those skilled in the art, and several improvements and modifications can be made without departing from the principles of the present invention. Therefore, modifications or improvements made without departing from the spirit of the present invention should also be regarded as the protection scope of the present invention.

Claims (4)

1. A dynamic awakening method for a Bluetooth Mesh low-power consumption node is characterized by comprising the following steps:

s101: in a Bluetooth Mesh networking system, a user sends an operation instruction to the system from a control end according to the requirement of the user;

s102: the system receives the instruction and sends the instruction to the friend node;

s103: the friend node temporarily stores the instruction received from the system;

s104: the friend node establishes a friendship relationship with the LPN and establishes a data transmission channel;

s105: after the synchronous clock and the awakening time are updated, the friend node sends data information to the LPN from the awakening time, wherein the data information comprises a command to be processed, the synchronous clock, a count value N and the like;

s106: the friend node and the LPN update a synchronous clock;

s107: the LPN determines whether data is received, and if the LPN does not receive data, the step S108 is skipped, and if the LPN receives data, the step S109 is skipped;

s108: the LPN judges whether the own dormancy time is not less than the longest dormancy time, if the own dormancy time of the LPN is less than the longest dormancy time, the step S1081 is skipped; if the own sleep time of the LPN is not less than the longest sleep time, skipping to the step S1082;

the step S1081 is: the sleep time of the LPN is increased by 2 times of the existing sleep time, that is, the existing sleep time is multiplied by 2, and a counting function N +1 is executed, where an initial value N is 0; skipping to step S113;

the step S1082 is: the LPN keeps the longest dormancy time, and the step S113 is skipped;

s109: receiving and processing information, and then synchronizing time between the LPN and the system;

s110: the LPN judges whether the own dormancy time is not more than the shortest dormancy time, if the own dormancy time of the LPN is more than the shortest dormancy time, the step S1101 is jumped to; if the own sleep time of the LPN is not more than the shortest sleep time, skipping to the step S1102;

the step S1101 is: the sleep time of the LPN is reduced to 50% of the existing sleep time, i.e., the existing sleep time is multiplied by 0.5; executing a counting function N-1, wherein an initial value N is 0; skipping to step S111;

the step S1102 is: the LPN maintains the shortest sleep time;

s111: the LPN records the self residual electric quantity;

s112: the LPN sends data information to the friend node;

s113: judging whether the friend node in the wake-up period receives data, if not, skipping to step S1131, and if so, skipping to step S1132;

the step S1131 is: adding 1 to a counting value N at a friend node, and when the maximum value N is reached to be 4, keeping the maximum value; skipping to step S105, and starting the next round of processing;

the step S1132 is: the counting value N at the friend node is reduced by 1, and the minimum value is kept when the minimum value N is 0; the process skips to step S105, and starts the next round of processing.

2. The bluetooth Mesh low-power consumption node dynamic wake-up method according to claim 1, characterized in that: the bluetooth Mesh networking system in step S101 is composed of a plurality of users, a system background, a plurality of relay gateway nodes, a plurality of friend nodes, and a plurality of low power consumption nodes, and has functions of sending, receiving, and information processing, and includes the following steps:

s21: a user sends an operation instruction to a system background from a control end according to the self requirement; the user side also receives information from the system background;

s22: the system background receives an instruction from a user and sends the instruction to the relay gateway node; the relay gateway node feeds back to the system background according to the instruction sending result;

s23: the relay gateway node receives an instruction from a system background and sends the instruction to the friend node; the friend node feeds back to the relay gateway node according to the instruction sending result;

s24: and the friend node receives the instruction, establishes the friendship relationship with the low power consumption node (LPN), and then sends a data packet to the low power consumption node (LPN). The data information comprises a command to be processed, a synchronous clock, a count value N and the like; receiving processing-completed data information from a low power consumption node (LPN);

s25: the low power consumption node (LPN) performs clock synchronization by means of the received data packet, and synchronizes a wakeup period by means of a count value; and when the LPN awakening time is up, receiving data from the friend node, and after the data is processed, recording a count value by a low power consumption node (LPN) and feeding back the count value to the friend node to synchronously update an awakening period.

3. The bluetooth Mesh low-power consumption node dynamic wake-up method according to claim 1, characterized in that: the initial value N in step S1081 and step S1101 is equal to 0, if the LPN receives information, counting is performed by N +1, and if the LPN does not receive information, counting is performed by N-1, where a value range of N is 0 or more and N is 4 or less; if the sleep time before the LPN has the information is determined to be T (unit: second), and the sleep time of the LPN in the initial state is 0.1 second, the sleep time of the LPN before the LPN performs one power recording operation is determined to be T (unit: second)

T＝0.1×2^N(s)。

4. The bluetooth Mesh low-power consumption node dynamic wake-up method according to claim 2, characterized in that: the system has the functions of sending, receiving and information processing, and the specific functions are as follows:

a: in the sending aspect, after the user sends the instruction, the user information is processed through a system background, and then the information is sent to the relay gateway node and the friend node, and finally reaches the low power consumption node (LPN);

b: in the aspect of receiving, the networking system mainly comprises a user, a system background, a relay gateway node, a friend node and a low power consumption node (LPN); when data is transmitted among all system members, after the lower-layer system member receives the data of the upper-layer system member, clock synchronization and awakening period updating are carried out by means of the data packet and the count value.

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