Intelligent spike control method and system based on Mesh ad hoc network

Abstract

The invention discloses an intelligent spike control method and system based on a Mesh ad hoc network, and is applied to the technical field of intelligent traffic. The method comprises the following steps: S1, an intelligent spike activation step: establishing a Mesh ad hoc network, and activating intelligent spikes through the Mesh ad hoc network; s2, a state changing step: the intelligent spikes are matched with corresponding intelligent spike controllers through the Mesh ad hoc network built in the S1, and enter a standby state; and S3, node control: the intelligent spike entering the standby state transmits a control instruction through an intelligent spike controller so as to control the intelligent spike node. According to the invention, communication data transmission between the intelligent spike and the roadside intelligent spike controller and between the intelligent spike and each intelligent spike device and execution of intelligent spike control instructions and strategies are realized.

Description

Technical Field

[0001] The present invention relates to the field of intelligent transportation technology, and more particularly to an intelligent road stud control method and system based on a Mesh self-organizing network. Background Art

[0002] Smart road studs are the product of intelligent traffic safety facilities under the background of smart traffic development. Smart road studs integrate traffic perception, wireless communication control and LED light release functions. Smart road studs are deployed on lanes to detect traffic information and provide safety warnings through light color and flashing frequency. The light color and flashing frequency of smart road studs are mainly controlled by the roadside smart road stud controller to issue control instructions.

[0003] Existing wireless control technologies for road studs focus on communication methods such as Bluetooth and LoRa. Bluetooth is a short-range communication technology at 2.4GHz, which is not suitable for ultra-long-distance applications such as highways. The communication distance of Lora can reach 1 km, with the characteristics of wide coverage, strong anti-interference ability, and many nodes. Mesh communication technology not only has the characteristics of Lora communication technology but also can be flexibly customized.

[0004] The advantages of Mesh networks are mainly reflected in the following aspects:

[0005] Strong anti-interference capability: Mesh self-organizing network synchronously adopts a combination of TDMA and FDMA to reduce conflicts and expand bandwidth; Anti-interference within the network: Mesh gateways will not frequently send data training instructions, and the receiving strategy of terminal nodes will not send data requests unnecessarily. When Mesh is idle, the entire network is relatively quiet, which can provide a clean environment for wireless communication; Anti-interference outside the network: The triggering of data reception relies on the synchronization header mechanism. Once the receiver thinks that the synchronization header has been captured, it will start filling the data buffer, and any subsequent signals will be treated as data payloads; Quasi-real-time two-way communication: After the Mesh synchronous self-organizing network is completed, each node will turn on the radio frequency in its own time slice and channel to prepare to transmit or receive data; Multi-hop network: Each device (including low-power terminal nodes) in Mesh can have at least two available communication paths. After the device joins the network, it can independently select multiple data transmission paths; Ultra-low power consumption: The Mesh protocol stack is specially designed and developed for low-power wireless sensor networks. Whether the sender or the receiver is idle, it is in a low-power state, and all nodes in the entire network can operate with low power consumption.

[0006] Therefore, it is an urgent problem for those skilled in the art to propose an intelligent road spike control method and system based on Mesh self-organizing network to solve the difficulties existing in the prior art. Summary of the invention

[0007] In view of this, the present invention provides a smart road stud control method and system based on Mesh ad hoc network, which realizes the communication and data transmission between the smart road stud and the roadside smart road stud controller and each smart road stud device, as well as the execution of smart road stud control instructions and strategies.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] An intelligent road spike control method based on Mesh self-organizing network includes the following steps:

[0010] S1. Smart road stud activation steps: build a Mesh self-organizing network and activate the smart road studs through the Mesh self-organizing network;

[0011] S2, state change step: the smart road stud matches the corresponding smart road stud controller through the Mesh self-organizing network built in S1 and enters the standby state;

[0012] S3, node control step: the intelligent road spike controller outputs control instructions to the intelligent road spike node to control the intelligent road spike.

[0013] In the above method, optionally, the Mesh self-organizing network architecture in S1 includes: a physical layer, a link layer, a network layer, a transport layer and an application layer.

[0014] In the above method, optionally, activating the smart road spikes through the Mesh ad hoc network in S1 specifically includes:

[0015] The Mesh self-organizing gateway sends broadcast frames at fixed intervals. After receiving the broadcast frames, the smart spike nodes that are not connected to the network apply for network competition. The winner of the competition will be assigned to an idle time slot to work. If the loser of the competition, it will remain in sleep mode and continue to participate in the competition after the random backoff time is reached.

[0016] In the above method, optionally, S2 further includes:

[0017] Based on the dynamic time division multiple access network foundation, combined with frequency division multiplexing frequency division multiple access, MESH self-organizing network redundant communication is realized; multiple time division multiple access sub-networks are simultaneously constructed in the entire network, using different channels respectively, and each sub-network performs multi-time slot control on the wake-up and sleep of the smart road spikes based on time.

[0018] The above method may optionally further include:

[0019] Each smart road spike node uses a Mesh self-organizing network for relay chain communication. Each smart road spike node can communicate with any node in the network. At the same time, each smart road spike node has multiple path options, and the node automatically selects the most stable path for communication and data transmission.

[0020] An intelligent road spike control system based on Mesh self-organizing network, applying any of the above-mentioned intelligent road spike control methods based on Mesh self-organizing network, comprising an intelligent road spike activation module, a state change module, and a node control module connected in sequence; wherein,

[0021] Smart road stud activation module, used to build a Mesh self-organizing network and activate smart road studs through the Mesh self-organizing network;

[0022] The state change module is used for the smart road stud to match the corresponding smart road stud controller through the built Mesh self-organizing network and enter the standby state;

[0023] The node control module is used to control the intelligent road spike by outputting control instructions to the intelligent road spike node through the intelligent road spike controller.

[0024] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a smart road stud control method and system based on Mesh ad hoc network, which has the following beneficial effects:

[0025] (1) The present invention is based on a customized high-precision time-controlled multi-hop multi-path Mesh wireless ad hoc network to achieve communication and data transmission between the intelligent road stud and the roadside intelligent road stud controller and various intelligent road stud devices, and to implement the execution of intelligent road stud control instructions and strategies. Furthermore, through the changes in the lights of the intelligent road studs, vehicles are warned and guided to drive safely, thereby effectively avoiding vehicle accidents on roads with poor visibility.

[0026] (2) Construct an intelligent road stud control method based on Mesh self-organizing network. The main technical improvements are mainly reflected in: ensuring the data transmission distance and quality of the intelligent road stud system; effectively improving the stability of the communication network of the entire road stud system to ensure that the entire communication network will not be affected by the damage of individual intelligent road studs in the entire system; reducing the power consumption generated by the communication of intelligent road stud equipment and extending the service life of intelligent road stud equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 A flow chart of a smart road spike control method based on Mesh ad hoc network provided by the present invention;

[0029] Figure 2A structural diagram of an intelligent road spike control system based on a Mesh self-organizing network provided by the present invention;

[0030] Figure 3 This is a network architecture diagram of the Mesh wireless ad hoc network provided by the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Reference Figure 1 As shown, the present invention discloses a smart road spike control method based on Mesh self-organizing network, comprising the following steps:

[0033] S1. Smart road stud activation steps: build a Mesh self-organizing network and activate the smart road studs through the Mesh self-organizing network;

[0034] S2, state change step: the smart road stud matches the corresponding smart road stud controller through the Mesh self-organizing network built in S1 and enters the standby state;

[0035] S3, node control step: the intelligent road spike controller outputs control instructions to the intelligent road spike node to control the intelligent road spike.

[0036] Furthermore, the Mesh self-organizing network architecture in S1 includes: physical layer, link layer, network layer, transport layer and application layer. Figure 3 As shown;

[0037] (1) Physical layer: Both the intelligent road stud equipment and the roadside intelligent road stud controller must be equipped with a radio frequency transceiver;

[0038] (2) Link layer: mainly includes time slot management protocol, TDMA protocol, CSMA protocol, error checking control protocol, flow control protocol, and data link quality maintenance protocol.

[0039] (3) Network layer: mainly includes time domain, space domain, frequency domain coordination, FDMA protocol, congestion control protocol, and routing algorithm.

[0040] (4) Transport layer: mainly includes intelligent road spike bandwidth control protocol, intelligent road spike priority control, intelligent road spike delay control, communication data recovery protocol, robustness monitoring protocol, intelligent road spike status monitoring protocol, data security protocol, and authentication operation protocol.

[0041] Furthermore, the activation of smart road studs through the Mesh self-organizing network in S1 specifically includes:

[0042] The Mesh self-organizing gateway sends broadcast frames at fixed intervals. After receiving the broadcast frames, the smart spike nodes that are not connected to the network apply for network competition. The winner of the competition will be assigned to an idle time slot to work. If the loser of the competition, it will remain in sleep mode and continue to participate in the competition after the random backoff time is reached.

[0043] After the smart road spike nodes are connected to the network, they will periodically wake up in the time slots they occupy to exchange information with the gateway, and they will be in a dormant state at other times, thus ensuring that the smart road spike nodes that have been connected to the network will not be interfered with by other terminals inside and outside the network.

[0044] Furthermore, S2 also includes:

[0045] The smart road stud tries to match the smart road stud controller. If it cannot match the controller, it will continue to enter the deep sleep state. The smart road stud that matches the smart road stud controller will enter the standby state. Based on the dynamic D-TDMA time division network foundation, combined with frequency division multiplexing FDMA (frequency division multiple access), MESH redundant network communication is realized. Multiple TDMA (time division multiple access) sub-networks are built in the entire network at the same time, using different channels (FDMA). Each sub-network performs multi-slot control on the wake-up and sleep of the smart road stud based on precise time.

[0046] Furthermore, it also includes:

[0047] Each smart road spike node uses a Mesh self-organizing network for relay chain communication. Each smart road spike node can communicate with any node in the network. At the same time, each smart road spike node has multiple path options, and the node automatically selects the most stable path for communication and data transmission.

[0048] Specifically, after the controller establishes a network, the intelligent road stud will always be in standby mode and can respond to the controller's instructions immediately at any time; the intelligent road stud receives the control command data under the constraints of the communication protocol and executes feedback, mainly including: working status (light on / off), number of lights (number of lit LED beads, 1-6), light brightness (1-16 levels), light frequency (number of flashes per second, 1-3), light color (red / yellow / white).

[0049] After receiving the control command, the smart road stud executes the command. Except for the light-on and light-off commands, all other commands received will be saved in the local memory. After receiving the light-on command, the LED lamp beads will be lit according to the set scheme and frequency until the light-off command is received.

[0050] Specifically, the stability judgment method is as follows: the wireless chip inside the smart road stud will automatically detect the signal strength of the data packet when it receives the communication data. The stronger the signal strength, the higher the transmission stability is, and the weaker the signal strength, the lower the transmission stability is. Under equal signal strength, the closer the distance between two smart road stud devices is, the higher the transmission stability is.

[0051] Reference Figure 2 As shown, an intelligent road spike control system based on Mesh self-organizing network, applying any of the above-mentioned intelligent road spike control methods based on Mesh self-organizing network, comprising an intelligent road spike activation module, a state change module, and a node control module connected in sequence; wherein,

[0052] Smart road stud activation module, used to build a Mesh self-organizing network and activate smart road studs through the Mesh self-organizing network;

[0053] The state change module is used for the smart road stud to match the corresponding smart road stud controller through the built Mesh self-organizing network and enter the standby state;

[0054] The node control module is used to control the intelligent road spike by outputting control instructions to the intelligent road spike node through the intelligent road spike controller.

[0055] In a specific embodiment, the smart road stud is installed on the road surface, and the smart road stud controller is installed on a roadside pole within 200 meters of the smart road stud, at a height of 2 meters. After the construction is completed, the deeply dormant smart road stud will search for the controller through the Mesh self-organizing network at fixed intervals. When the controller is found, the controller's clock will be synchronized to ensure that the smart road studs in the entire system flash synchronously. Then it will enter the standby mode and wait for the controller's instructions.

[0056] The intelligent road stud controller can be remotely set by on-site maintenance personnel or the management platform to set the lighting scheme and flashing frequency parameters. The roadside intelligent road stud controller sends the instructions to the road stud through the Mesh self-organizing network. After the road stud receives the instructions, it saves them locally.

[0057] The remote management platform or on-site detection equipment can send lighting instructions to the roadside intelligent road stud controller according to the road condition information. After receiving the instructions, the roadside intelligent road stud controller sends the lighting instructions to the road stud through the Mesh self-organizing network. After receiving the instructions, the road stud responds to the lights according to the set scheme, including: working status (light on / off), number of lights (number of lit LED beads, 1-6), light brightness (1-16 levels), lighting frequency (number of flashes per second, 1-3), and light color (red / yellow / white).

[0058] The remote management platform or on-site detection equipment sends a light-off command to the smart road stud controller after the road condition that requires the lights to be turned on is resolved. After receiving the command, the controller sends the light-off command to the smart road stud through the Mesh self-organizing network. After receiving the light-off command, the smart road stud turns off the LED light.

[0059] The present invention adopts the intelligent road spike control method based on Mesh self-organizing network to achieve the following beneficial effects:

[0060] (1) The communication distance between the roadside intelligent road stud controller and the intelligent road stud equipment can reach 1 km, with a wide coverage area; it has strong anti-interference ability against both internal and external interference within the network; it can perform uplink or downlink communication at any time, and supports a large number of terminals to actively report simultaneously;

[0061] (2) Mesh's 2.4GHz frequency wavelength is shorter and has stronger diffraction capability in the case of vehicle obstruction and interference; the failure of a smart road spike node will not cause large-scale network paralysis, and it has self-organization and self-healing capabilities.

[0062] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0063] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A smart road spike control method based on Mesh ad hoc network, characterized in that: The following steps are involved: S1. Smart road stud activation steps: build a Mesh self-organizing network and activate the smart road studs through the Mesh self-organizing network; S2, state change step: the smart road stud matches the corresponding smart road stud controller through the Mesh self-organizing network built in S1 and enters the standby state; S3, node control step: the intelligent road spike controller outputs control instructions to the intelligent road spike node to control the intelligent road spike.

2. The intelligent road spike control method based on Mesh ad hoc network according to claim 1 is characterized in that: The Mesh self-organizing network architecture in S1 includes: physical layer, link layer, network layer, transport layer and application layer.

3. The intelligent road spike control method based on Mesh ad hoc network according to claim 1 is characterized in that: Activating smart road studs through Mesh self-organizing network in S1 includes: The Mesh self-organizing gateway sends broadcast frames at fixed intervals. After receiving the broadcast frames, the smart spike nodes that are not connected to the network apply for network competition. The winner of the competition will be assigned to an idle time slot to work. If the loser of the competition, it will remain in sleep mode and continue to participate in the competition after the random backoff time is reached.

4. The intelligent road spike control method based on Mesh ad hoc network according to claim 1 is characterized in that: S2 also includes: Based on the dynamic time division multiple access network foundation, combined with frequency division multiplexing frequency division multiple access, MESH self-organizing network redundant communication is realized; multiple time division multiple access sub-networks are simultaneously constructed in the entire network, using different channels respectively, and each sub-network performs multi-time slot control on the wake-up and sleep of the smart road spikes based on time.

5. The intelligent road spike control method based on Mesh ad hoc network according to claim 1 is characterized in that: Also includes: Each smart road spike node uses a Mesh self-organizing network for relay chain communication. Each smart road spike node can communicate with any node in the network. At the same time, each smart road spike node has multiple path options, and the node automatically selects the most stable path for communication and data transmission.

6. An intelligent road spike control system based on Mesh ad hoc network, characterized in that: A smart road spike control method based on Mesh self-organizing network as claimed in any one of claims 1 to 5 is applied, comprising a smart road spike activation module, a state change module, and a node control module connected in sequence; wherein: Smart road stud activation module, used to build a Mesh self-organizing network and activate smart road studs through the Mesh self-organizing network; The state change module is used for the smart road stud to match the corresponding smart road stud controller through the built Mesh self-organizing network and enter the standby state; The node control module is used to control the intelligent road spike by outputting control instructions to the intelligent road spike node through the intelligent road spike controller.

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