Low-power-consumption Bluetooth signal strength monitoring system and method based on private 2.4 G protocol

Abstract

The invention belongs to the technical field of Bluetooth monitoring, and particularly discloses a low-power-consumption Bluetooth signal strength monitoring system and method based on a private 2.4 G protocol, the system comprises a Bluetooth central control node and a plurality of Bluetooth monitoring nodes, and private 2.4 G communication connection is established between the Bluetooth central control node and each Bluetooth monitoring node. According to the invention, the Bluetooth technology is adopted to monitor the signal intensity of the wireless Bluetooth equipment, and positioning and distance measurement calculation are carried out based on the signal intensity of the wireless Bluetooth equipment acquired and reported by the Bluetooth private 2.4 G channel, so that non-inductive unlocking of the vehicle is realized conveniently, and the problems of large bus load, high data delay, high reliability and the like existing in a traditional communication bus transmission mode can be solved. And the complexity of a monitoring system can be effectively reduced, the power consumption of the system can be reduced, the stability of data acquisition of the system can be improved, the vehicle body wiring difficulty can be reduced, and the cost can be saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of Bluetooth monitoring, and in particular relates to a low-power Bluetooth signal strength monitoring system and method based on a private 2.4G protocol. Background Art

[0002] At present, the digital car key technology based on low-power Bluetooth signal strength collection is booming. The popular digital car key low-power Bluetooth solution is to deploy a low-power Bluetooth main module (i.e., central control node) (connected to the mobile phone or Bluetooth key) at the central control position and multiple low-power Bluetooth node modules (i.e., monitoring nodes) (listening to the Bluetooth key or mobile phone signal strength indication) around the vehicle (such as front and rear bumpers, left and right rearview mirrors). Based on the signal strength indication value (RSSI) of each monitoring node, the algorithm is used to estimate the distance between the target car key or mobile phone and the vehicle, thereby meeting the demand for non-sensing vehicle unlocking.

[0003] The existing digital car key low-power Bluetooth signal strength monitoring scheme is mainly as follows: 1. The central control node communicates with several monitoring nodes through the CAN / LIN bus. 2. After connecting to the Bluetooth key or mobile phone, the central control node sends connection information to the monitoring node through the CAN / LIN bus for monitoring. 3. After receiving the connection information sent by the central control node through the CAN / LIN bus, the monitoring node starts synchronous monitoring and reports the monitored RSSI value to the central control. 4. If synchronization is lost during the monitoring process, the monitoring node re-initiates a connection information request to the central control node.

[0004] The existing digital car key low-power Bluetooth signal strength monitoring solution has the following main shortcomings: 1. It makes the vehicle wiring harness complicated, wiring difficult, and the cost is high. 2. For the signal strength monitoring of multiple monitoring nodes and multiple connected devices, the load on the communication bus is relatively large, the data delay is high, which is not conducive to positioning and ranging. 3. It is difficult to synchronize when monitoring multiple nodes, and it is easy to lose data. Summary of the invention

[0005] The purpose of the present invention is to provide a low-power Bluetooth signal strength monitoring system and method based on a private 2.4G protocol to solve the above problems existing in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a low-power Bluetooth signal strength monitoring system based on a private 2.4G protocol, including a Bluetooth central control node and several Bluetooth monitoring nodes, wherein a private 2.4G communication connection is established between the Bluetooth central control node and each Bluetooth monitoring node, and the Bluetooth central control node is used to establish a Bluetooth standard connection with an external Bluetooth device, and send device connection information to each Bluetooth monitoring node, and receive RSSI signal strength values ​​fed back by each Bluetooth monitoring node, and use the RSSI signal strength values ​​fed back by each Bluetooth monitoring node to perform positioning and ranging calculations on the external Bluetooth device, and the Bluetooth monitoring node is used to monitor the Bluetooth signal strength of the external Bluetooth device according to the device connection information, obtain the corresponding RSSI signal strength value, and send the RSSI signal strength value to the Bluetooth central control node.

[0007] During its application, when a user holds an external Bluetooth device, such as a mobile phone or a Bluetooth key, and approaches the Bluetooth monitoring system, the Bluetooth central control node detects the Bluetooth signal of the external Bluetooth device within the Bluetooth signal search range, establishes a Bluetooth standard connection with the external Bluetooth device, and then generates corresponding device connection information, and transmits the device connection information to each Bluetooth monitoring node based on a private 2.4G communication method. After receiving the device connection information, each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information, obtains the corresponding RSSI signal strength value, and then feeds back the RSSI signal strength value to the Bluetooth central control node. Finally, the Bluetooth central control node uses the RSSI signal strength values ​​fed back by each Bluetooth monitoring node to perform positioning and ranging calculations on the external Bluetooth device, and determines the distance between the external Bluetooth device and the vehicle where the system is located. When the distance is within the unlocking range, the Bluetooth central control node can perform a senseless unlocking of the vehicle.

[0008] In one possible design, the Bluetooth central control node is installed on the vehicle's center console.

[0009] In a possible design, there are four Bluetooth monitoring nodes, which are installed on both sides of the front bumper of the vehicle and both sides of the rear bumper of the vehicle respectively.

[0010] In a possible design, the Bluetooth central control node and each Bluetooth monitoring node all use a low-power Bluetooth module.

[0011] In a possible design, the Bluetooth monitoring node is provided with a GFSK modem, and monitors the Bluetooth signal strength of an external Bluetooth device via the GFSK modem.

[0012] In a possible design, a private 2.4G communication connection is established between the Bluetooth central control node and each Bluetooth listening node through a selected 2.4G channel.

[0013] In a second aspect, the present invention provides a low-power Bluetooth signal strength monitoring method based on a private 2.4G protocol, which is applied to the low-power Bluetooth signal strength monitoring system based on a private 2.4G protocol in the first aspect, and the method includes: After the Bluetooth central control node establishes a Bluetooth connection and pairing with the external Bluetooth device, it sends device connection information to each Bluetooth monitoring node; Each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information and obtains the corresponding RSSI signal strength value; Each Bluetooth monitoring node sends the RSSI signal strength value of the external Bluetooth device it monitors to the Bluetooth central control node; The Bluetooth central control node uses the RSSI signal strength value fed back by each Bluetooth monitoring node to perform positioning and ranging calculations on external Bluetooth devices.

[0014] In one possible design, before the Bluetooth central control node sends the device connection information to each Bluetooth listening node, the method further includes: The Bluetooth central control node and the Bluetooth monitoring node select the corresponding 2.4G channel for channel binding based on the interactive signal quality.

[0015] In a possible design, the Bluetooth central control node and the Bluetooth listening node select a corresponding 2.4G channel for channel binding according to the interactive signal quality, including: The Bluetooth central control node classifies the 2.4G channels between the Bluetooth monitoring node and the Bluetooth monitoring node based on the preset channel evaluation mechanism, selects the best 2.4G channel according to the channel classification results, and sends the corresponding channel selection information to the Bluetooth monitoring node; After receiving the channel selection information, the Bluetooth monitoring node replies a confirmation packet to the Bluetooth central control node and binds the corresponding 2.4G channel.

[0016] In a possible design, each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information to obtain the corresponding RSSI signal strength value, including: Each Bluetooth monitoring node extracts configuration parameters from the device connection information, and sets the configuration parameters to the GFSK modem contained therein, so that the GFSK modem monitors the Bluetooth signal strength of the external Bluetooth device based on the configuration parameters to obtain the corresponding RSSI signal strength value.

[0017] Beneficial effect: The present invention adopts Bluetooth technology to monitor the signal strength of wireless Bluetooth devices, and collects and reports the signal strength of wireless Bluetooth devices based on the Bluetooth private 2.4G channel for positioning and ranging calculation, which is convenient for realizing vehicle non-sensing unlocking, and can solve the problems of large bus load, high data delay, easy data loss and so on in the traditional communication bus transmission method. It can effectively reduce the complexity of the monitoring system, reduce the power consumption of the monitoring system, increase the stability of the system data collection, and can reduce the difficulty of vehicle body routing and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the system structure provided in Example 1 of the present invention; Figure 2 This is a schematic diagram of the method steps provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0020] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0021] It should be understood that, unless otherwise clearly specified and limited, the corresponding terms should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments can be understood according to specific circumstances.

[0022] In the following description, certain details are provided to facilitate a complete understanding of the example embodiments. However, it will be appreciated by those of ordinary skill in the art that the example embodiments may be implemented without these certain details. For example, the system may be shown in a block diagram to avoid obscuring the example with unnecessary details. In other embodiments, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid obscuring the embodiments.

[0023] Embodiment 1: This embodiment provides a low-power Bluetooth signal strength monitoring system based on a private 2.4G protocol, such as Figure 1 As shown, it includes a Bluetooth central control node and several Bluetooth listening nodes. A private 2.4G communication connection is established between the Bluetooth central control node and each Bluetooth listening node. The Bluetooth central control node is used to establish a Bluetooth standard connection with an external Bluetooth device, send device connection information to each Bluetooth listening node, and receive the RSSI signal strength value fed back by each Bluetooth listening node, and use the RSSI signal strength value fed back by each Bluetooth listening node to perform positioning and ranging calculations on the external Bluetooth device. The Bluetooth listening node is used to monitor the Bluetooth signal strength of the external Bluetooth device according to the device connection information, obtain the corresponding RSSI signal strength value, and send the RSSI signal strength value to the Bluetooth central control node.

[0024] In specific implementation, when a user holds an external Bluetooth device, such as a mobile phone or a Bluetooth key, and approaches the Bluetooth monitoring system, the Bluetooth central control node detects the Bluetooth signal of the external Bluetooth device within the Bluetooth signal search range, establishes a Bluetooth standard connection with the external Bluetooth device, and then generates corresponding device connection information, and transmits the device connection information to each Bluetooth monitoring node based on a private 2.4G communication method (Bluetooth private 2.4G communication refers to the technology of communicating through a private protocol in Bluetooth devices using the 2.4GHz frequency band. This protocol allows devices to customize communication rules and formats to meet specific application requirements without violating the Bluetooth standard). After receiving the device connection information, each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information, obtains the corresponding RSSI (Received Signal Strength Indicator) signal strength value (used to measure the strength of the received wireless signal), and then feeds back the RSSI signal strength value to the Bluetooth central control node. The Bluetooth docking between the Bluetooth central control node and the external Bluetooth device and the Bluetooth docking between each Bluetooth monitoring node and the external Bluetooth device can be standard Bluetooth connections. Finally, the Bluetooth central control node uses the RSSI signal strength value fed back by each Bluetooth listening node to perform positioning and ranging calculations on the external Bluetooth device, and determines the distance between the external Bluetooth device and the vehicle where the system is located. When the distance is within the unlocking range, the Bluetooth central control node can perform a senseless unlocking of the vehicle.

[0025] Furthermore, the Bluetooth central control node and each Bluetooth monitoring node all use low-power Bluetooth modules, such as HS6621Cx series Bluetooth modules, N32WB031 series Bluetooth modules, BT8931H series Bluetooth modules, etc., to reduce the power consumption of the system operation. The Bluetooth central control node is installed on the vehicle center console and provides a central control power supply interface. The Bluetooth monitoring node is provided with 4 nodes, which are respectively installed on both sides of the front bumper of the vehicle and the rear bumper of the vehicle to provide a module power supply interface. A private 2.4G communication connection is established between the Bluetooth central control node and each Bluetooth monitoring node through a selected 2.4G channel. And the Bluetooth monitoring node is provided with a GFSK modem, and monitors the Bluetooth signal strength of external Bluetooth devices through the GFSK modem.

[0026] The system of this embodiment can solve the problems of heavy bus load, high data delay, easy data loss, etc. existing in the traditional communication bus transmission method. It can effectively reduce the complexity of the monitoring system, reduce the power consumption of the monitoring system, increase the stability of the system data acquisition, and reduce the difficulty of vehicle body routing, saving costs.

[0027] Embodiment 2: This embodiment provides a low-power Bluetooth signal strength monitoring method based on a private 2.4G protocol. The method is applied to the low-power Bluetooth signal strength monitoring system based on a private 2.4G protocol in Example 1. Figure 2 As shown, the method comprises the following steps: S1. After the Bluetooth central control node establishes a Bluetooth connection and pairs with an external Bluetooth device, it sends device connection information to each Bluetooth monitoring node.

[0028] In specific implementation, when a user holds an external Bluetooth device, such as a mobile phone or a Bluetooth key, and approaches the Bluetooth monitoring system, the Bluetooth central control node detects the Bluetooth signal of the external Bluetooth device within the Bluetooth signal search range, establishes a Bluetooth standard connection with the external Bluetooth device, and then generates the corresponding device connection information, and transmits the device connection information to each Bluetooth monitoring node based on the private 2.4G communication method. ‌Bluetooth private 2.4G communication‌ refers to the technology of communicating through a private protocol in Bluetooth devices using the 2.4GHz frequency band. This protocol allows devices to customize communication rules and formats to meet specific application requirements without violating Bluetooth standards. ‌Bluetooth private 2.4G communication has the advantages of flexibility (communication rules can be customized according to specific application requirements to improve the flexibility and adaptability of the system) and security (a higher level of security mechanism can be designed to protect data transmission).

[0029] Before the Bluetooth central control node sends device connection information to each Bluetooth listening node, the Bluetooth central control node and the Bluetooth listening node need to first select the corresponding 2.4G channel for channel binding based on the interactive signal quality, that is, the Bluetooth central control node and the Bluetooth listening node communicate and bind the channel at the 2.4G frequency point (the fixed channel is tentatively set at 2410MHz frequency point), specifically including: the Bluetooth central control node classifies the 2.4G channels between it and the Bluetooth listening node based on the preset channel evaluation mechanism, and selects the optimal 2.4G channel from them according to the channel classification results, and sends the corresponding channel selection information to the Bluetooth listening node. After receiving the channel selection information, the Bluetooth listening node replies to the Bluetooth central control node with a confirmation packet, binds the corresponding 2.4G channel, and establishes 2.4GHz frequency band Bluetooth communication.

[0030] S2. Each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information to obtain the corresponding RSSI signal strength value.

[0031] In a specific implementation, the device connection information includes corresponding configuration parameters. For example, the C language structure of the device connection information is as follows: #define CHANNEL_INFO_NUM 5 typedef struct { uint32_t access_addr; uint32_t crc_init; uint32_t time_offset; uint32_t interval; uint16_t event_count; uint8_t link_num; uint8_t phy; uint8_t valid; uint8_t role; uint8_t channels[CHANNEL_INFO_NUM]; }conn_event_info_t; After receiving the device connection information, each Bluetooth monitoring node extracts the configuration parameters from the device connection information and sets the configuration parameters to the GFSK (Gauss frequency Shift Keying) modem it contains, so that its GFSK modem starts monitoring transaction scheduling based on the configuration parameters, monitors the Bluetooth signal strength of the external Bluetooth device, and obtains the corresponding RSSI (Received Signal Strength Indicator) signal strength value (used to measure the strength of the received wireless signal).

[0032] S3. Each Bluetooth monitoring node sends the RSSI signal strength value of the external Bluetooth device it monitors to the Bluetooth central control node.

[0033] During specific implementation, each Bluetooth monitoring node determines the RSSI signal strength value of the external Bluetooth device, and sends the RSSI signal strength value of the external Bluetooth device monitored by it to the Bluetooth central control node.

[0034] S4. The Bluetooth central control node uses the RSSI signal strength value fed back by each Bluetooth monitoring node to perform positioning and ranging calculations on external Bluetooth devices.

[0035] During specific implementation, the Bluetooth central control node can perform positioning and ranging calculations (such as triangulation positioning solution, etc.) of external Bluetooth devices based on the RSSI signal strength values ​​fed back by each Bluetooth listening node to determine the distance between the external Bluetooth device and the vehicle where the system is located. When the distance is within the unlocking range, the Bluetooth central control node can perform contactless unlocking of the vehicle.

[0036] Embodiment 3: This embodiment provides a low-power Bluetooth module, and the low-power Bluetooth module includes: A Bluetooth transceiver is used to establish Bluetooth signal connection between the processor and other Bluetooth modules or Bluetooth devices; A memory for storing instructions; The processor is used to read the instructions stored in the storage chip and implement the functions of the Bluetooth central control node or the Bluetooth monitoring node in Example 1 according to the instructions.

[0037] Optionally, the memory may include, but is not limited to, a random access memory (RAM), a read only memory (ROM), a flash memory, a first input first output (FIFO) and / or a first in last out (FILO) memory, etc. The processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0038] This embodiment also provides a readable storage medium, which stores instructions. When the instructions are executed on the Bluetooth module, the Bluetooth module implements the function of the Bluetooth central control node or the Bluetooth listening node in Example 1. The readable storage medium refers to a carrier for storing data, which may include but is not limited to a floppy disk, an optical disk, a hard disk, a flash memory, a USB flash drive, and / or a memory stick. This embodiment also provides a program product. When the program product is executed on the Bluetooth module, the function of the Bluetooth central control node or the Bluetooth listening node in Example 1 is implemented.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-power Bluetooth signal strength monitoring system based on a private 2.4G protocol, characterized in that: It includes a Bluetooth central control node and several Bluetooth listening nodes. A private 2.4G communication connection is established between the Bluetooth central control node and each Bluetooth listening node. The Bluetooth central control node is used to establish a Bluetooth standard connection with an external Bluetooth device, send device connection information to each Bluetooth listening node, receive RSSI signal strength values ​​fed back by each Bluetooth listening node, and use the RSSI signal strength values ​​fed back by each Bluetooth listening node to perform positioning and ranging calculations on the external Bluetooth device. The Bluetooth listening node is used to monitor the Bluetooth signal strength of the external Bluetooth device according to the device connection information, obtain the corresponding RSSI signal strength value, and send the RSSI signal strength value to the Bluetooth central control node.

2. The low-power Bluetooth signal strength monitoring system based on the private 2.4G protocol according to claim 1 is characterized in that: The Bluetooth central control node is installed on the vehicle center console.

3. The low-power Bluetooth signal strength monitoring system based on the private 2.4G protocol according to claim 1 is characterized in that: There are four Bluetooth monitoring nodes, which are respectively installed on both sides of the front bumper of the vehicle and both sides of the rear bumper of the vehicle.

4. The low-power Bluetooth signal strength monitoring system based on the private 2.4G protocol according to claim 1 is characterized in that: The Bluetooth central control node and each Bluetooth monitoring node all use low-power Bluetooth modules.

5. The low-power Bluetooth signal strength monitoring system based on the private 2.4G protocol according to claim 1 is characterized in that: The Bluetooth monitoring node is provided with a GFSK modem, and monitors the Bluetooth signal strength of an external Bluetooth device through the GFSK modem.

6. The low-power Bluetooth signal strength monitoring system based on the private 2.4G protocol according to claim 1 is characterized in that: The Bluetooth central control node and each Bluetooth monitoring node establish a private 2.4G communication connection through the selected 2.4G channel.

7. A method for monitoring the signal strength of a low-power Bluetooth signal based on a private 2.4G protocol, applied to a system for monitoring the signal strength of a low-power Bluetooth signal based on a private 2.4G protocol as described in any one of claims 1 to 6, characterized in that: include: After the Bluetooth central control node establishes a Bluetooth connection and pairing with the external Bluetooth device, it sends device connection information to each Bluetooth monitoring node; Each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information and obtains the corresponding RSSI signal strength value; Each Bluetooth monitoring node sends the RSSI signal strength value of the external Bluetooth device it monitors to the Bluetooth central control node; The Bluetooth central control node uses the RSSI signal strength value fed back by each Bluetooth monitoring node to perform positioning and ranging calculations on external Bluetooth devices.

8. The method for monitoring the signal strength of low-power Bluetooth based on the private 2.4G protocol according to claim 7, characterized in that: Before the Bluetooth central control node sends the device connection information to each Bluetooth monitoring node, the method further includes: The Bluetooth central control node and the Bluetooth monitoring node select the corresponding 2.4G channel for channel binding based on the interactive signal quality.

9. The method for monitoring the signal strength of low-power Bluetooth based on the private 2.4G protocol according to claim 8, characterized in that: The Bluetooth central control node and the Bluetooth monitoring node select a corresponding 2.4G channel for channel binding according to the interactive signal quality, including: The Bluetooth central control node classifies the 2.4G channels between the Bluetooth monitoring node and the Bluetooth monitoring node based on the preset channel evaluation mechanism, selects the best 2.4G channel according to the channel classification results, and sends the corresponding channel selection information to the Bluetooth monitoring node; After receiving the channel selection information, the Bluetooth monitoring node replies a confirmation packet to the Bluetooth central control node and binds the corresponding 2.4G channel.

10. The method for monitoring the signal strength of low-power Bluetooth based on the private 2.4G protocol according to claim 7, characterized in that: Each Bluetooth monitoring node monitors the Bluetooth signal strength of the external Bluetooth device according to the device connection information to obtain the corresponding RSSI signal strength value, including: Each Bluetooth monitoring node extracts configuration parameters from the device connection information, and sets the configuration parameters to the GFSK modem contained therein, so that the GFSK modem monitors the Bluetooth signal strength of the external Bluetooth device based on the configuration parameters to obtain the corresponding RSSI signal strength value.

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