CN103945438B - A kind of wireless access points AP, communication system and communication means - Google Patents

Abstract

The invention discloses a communication system and method. The system includes an AP, N terminals and a data processing module, wherein the AP includes a wireless transceiver module and a visible light receiving module. coverage of communication signals. In the communication method, when the terminal receives the request information from the AP, according to the state of the optical and electrical channels, it uses radio or visible light communication or simultaneously uses radio and visible light communication to send service data to the AP, and the subsequent AP adds service data to the service data. After corresponding identification information, it is reported to the data processing module, and the data processing module performs corresponding business processing on the business data. Therefore, the present invention can realize timely transmission of business data by using another link when one of the communication links is disconnected or the signal is weak, which solves the problem of inability to communicate due to disconnection of the communication link in the existing single communication mode. Ensure timely upload of business data.

Description

A wireless access point AP, communication system and communication method

technical field

The invention belongs to the technical field of wireless communication, and in particular relates to an AP (Access Point, wireless access point), a communication system and a communication method.

Background technique

The working environment under the mine is complex and harsh, and the gas concentration is high, which is prone to danger. Therefore, it is necessary to know the environmental conditions and staff information under the mine at any time, so as to facilitate the follow-up work of safety prevention and control, dispatching and control under the mine. Based on this, the underground communication system, which undertakes the function of underground business data transmission, has become an essential system for underground operations.

At present, the underground communication system adopts a single communication mode. For example, Henan Feiguang Communication Technology Co., Ltd. proposed a mine communication system based on 3G/4G (3rd/4th Generation, third/fourth generation mobile communication technology) network, which uses 3G/4G communication modules to connect communication base stations with The mine communication terminal is connected, and the communication base station is connected with the mine communication system by Ethernet, so as to realize the transmission of relevant data during the mine operation; the coal mine working face communication system based on visible light communication proposed by China University of Mining and Technology uses the working face The existing lighting cable is used as the transmission medium, and a visible light base station based on LED (Light-Emitting Diode, light-emitting diode) lighting is added to the working face. At the same time, miners wear LED miner's lamps with information sending and receiving functions as mobile nodes to access signals nearby The strongest visible light base station to realize data transmission.

In the above-mentioned communication system, the signal of 3G/4G network is unstable when encountering landslides or thick walls, and the link is easily disconnected when the optical link is blocked. Therefore, because the existing communication system adopts a single communication method, it cannot be used due to the underground environment. The complexity leads to network instability, and when the communication link is disconnected, the timely and effective upload of relevant business data cannot be guaranteed.

Contents of the invention

In view of this, the object of the present invention is to provide a wireless access point AP, a communication system and a communication method, which transmit business data through photoelectric cooperation, and have solved the problem that the communication link cannot be disconnected in the existing single communication mode. Ensure timely upload of business data.

For this reason, the present invention discloses following technical scheme:

A wireless access point AP, the AP includes a wireless transceiver module and a visible light receiving module, wherein:

The wireless transceiver module is used to send and receive data by radio;

The visible light receiving module is used to receive data through visible light communication;

The visible light hotspot coverage area of the visible light receiving module is included in the wireless signal coverage area of the first wireless transceiver module.

For the aforementioned AP, preferably, the AP corresponds to unique first identification information.

For the above AP, preferably, the visible light receiving module includes K photodiodes PD, each of which corresponds to unique second identification information, and K is a natural number greater than 1.

A communication system, including the above-mentioned AP and N terminals, where the terminals communicate with the AP, and further include;

The data processing module is configured to receive the service data sent by the AP, and perform corresponding service processing on the service data according to the service type to which the service data belongs.

In the communication system above, preferably, the service types specifically include positioning services, video return services, and sensor detection data return services.

In the above communication system, preferably, the terminal includes a visible light mobile terminal and an environmental sensor terminal, and the visible light mobile terminal corresponds to unique third identification information.

In the above communication system, preferably, the visible light mobile terminal specifically includes a first Wi-Fi transceiver, a first visible light emitting device, a camera, and a first environment sensor, wherein:

The first Wi-Fi transceiver is used to communicate with the AP in a radio manner, so as to realize the transmission of business data under the positioning service, video return service and sensor detection data return service;

The first visible light sending module is configured to communicate with the AP in the form of visible light communication, so as to realize the transmission of business data under the positioning service, video return service and sensor detection data return service;

The service data of the positioning service includes the third identification information, the service data of the video return service includes the video data recorded by the camera, and the service data of the sensor detection data return service includes the first Environmental data detected by environmental sensors.

In the above communication system, preferably, the first Wi-Fi transceiver is also used to maintain the location information and the frequency information of the places frequently visited by the visible light mobile terminal, and broadcast the location information and frequency information .

In the above communication system, preferably, the environmental sensor terminal specifically includes a second Wi-Fi transceiver, a second visible light emitting device, and a second environmental sensor, wherein:

The second Wi-Fi transceiver is used to communicate with the AP in a radio manner, so as to realize the transmission of service data under the sensor detection data return service;

The second visible light sending module is configured to communicate with the AP in a visible light communication manner, so as to realize the transmission of service data under the sensor detection data return service;

The service data of the sensor detection data return service further includes the environment data detected by the second environment sensor.

A communication method, based on the communication system as described above, comprising:

If the terminal can receive the request information from the AP, when the terminal receives the request information from the AP, it will use one of the following transmission modes to send service data to the AP according to the state of the optical and electrical channels: radio mode , It can combine the optical communication method, and simultaneously adopt the synergistic method of radio and visible light communication;

The AP adds corresponding identification information to the service data according to the transmission mode of the service data, and sends the service data after the identification information is added to the data processing module;

The data processing module performs corresponding analysis and business processing on the business data according to the business type to which the business data to which the identification information is added belongs, and obtains a business processing result.

In the communication method above, preferably, when the terminal receives the request information from the AP, it uses one of the following transmission methods to send service data to the AP according to the state of the optical and electrical channels: radio, visible light communication, and simultaneous Using radio and visible light communication in a coordinated way, including:

If the signal strength of the optical channel is greater than the preset threshold value, the terminal sends the service data by means of visible light communication;

If the signal strength of the electrical channel is greater than the preset threshold value, the terminal sends the service data by radio;

If the signal strengths of the optical channel and the electrical channel are invalid, or the signal strengths of both the optical and electrical channels are greater than a preset threshold value, the terminal transmits the service data cooperatively by means of radio and visible light communication.

In the above communication method, preferably, the AP adds corresponding identification information to the service data according to the transmission mode of the service data, and sends the service data after adding the identification information to the data processing module, specifically including:

If the business data is transmitted by radio, the wireless transceiver module adds the first identification information to the business data, and sends the business data after adding the first identification information to the data processing module;

If the service data is transmitted through visible light communication, the PD receiving the service data adds the second identification information of the PD to the service data, and sends the service data added with the second identification information to the data processing module;

If the service data is repeatedly transmitted by radio and visible light communication, the PD receiving the service data adds the second identification information of the PD to the service data, and adds the service data with the second identification information sent to the data processing module.

In the communication method above, preferably, the data processing module performs corresponding analysis and business processing on the business data after the identification information is added according to the business type to which the business data after the identification information is added, specifically including;

If the service type of the service data after adding the first identification information is a positioning service, the data processing module locates the corresponding terminal according to the third identification information and the first identification information in the service data; The service type to which the service data after the identification information belongs is a positioning service, and the data processing module locates the corresponding terminal according to the third identification information and the second identification information in the service data;

If the service type of the service data after adding the identification information is a video return service, the data processing module performs video service processing on the service data;

If the service type of the service data after adding the identification information is a sensor detection data return service, the data processing module performs sensor data service processing on the service data.

The above-mentioned communication method, preferably, also includes:

If the terminal cannot receive the request information from the AP, then the terminal uses the opportunistic network constructed between the terminals based on the maximization criterion of the probability of data arriving at the AP, and selects the best relay node with other terminals as relay nodes from the opportunistic network. optimal relay path, and send service data carrying additional positioning information to the AP through the optimal relay path, wherein the additional positioning information includes the forwarding time of the service data of the terminal on the relay path and the The group number of the group where the terminal is located;

The AP adds corresponding identification information to the service data according to the receiving method of the service data carrying the additional positioning information, and sends the service data after adding the identification information to the data processing module;

The data processing module performs corresponding analysis and business processing on the business data according to the business type described in the business data carrying additional positioning information after the identification information is added, and obtains a business processing result.

In the above communication method, preferably, the AP adds corresponding identification information to the service data according to the receiving method of the service data carrying additional positioning information, and sends the service data with the identification information added to the data processing modules, including:

If the AP receives the service data carrying additional positioning information by radio, the wireless transceiver module of the AP adds the first identification information to the service data, and adds the service data after the first identification information sending data to the data processing module;

If the AP receives the service data carrying additional positioning information through visible light, the PD receiving the service data in the AP adds the second identification information of the PD to the service data, and adds the second sending the business data of identification information to the data processing module;

If the AP repeatedly receives service data carrying additional positioning information through radio and visible light communication, the PD receiving the service data in the AP adds the second identification information of the PD to the service data, and adds the The service data of the second identification information is sent to the data processing module.

In the above communication method, preferably, the data processing module performs corresponding analysis and business processing on the business data according to the business type described in the business data carrying additional positioning information after the identification information is added, specifically including:

If the service type of the service data carrying additional positioning information after adding the first identification information is a positioning service, the data processing module will and the forwarding time to locate the corresponding terminal; if the service type of the service data carrying the additional positioning information after adding the second identification information belongs to the positioning service, the data processing module according to the second identification in the service data Information, third identification information, group number and forwarding time to locate the corresponding terminal;

If the service type of the service data carrying the additional positioning information after adding the identification information is a video return service, the data processing module performs video service processing on the service data;

If the service type of the service data carrying the additional positioning information after the identification information is added is a sensor detection data return service, the data processing module performs sensor data service processing on the service data.

The communication system provided by the embodiment of the present invention includes an AP, N terminals and a data processing module, wherein the AP includes a wireless transceiver module and a visible light receiving module, and the AP can provide both radio and visible light to the underground terminal through the above two modules included in the AP. coverage of communication signals. In the communication method based on this communication system, when the terminal receives the request information from the AP, it sends service data to the AP in a radio mode or a visible light mode, or in a coordinated radio and visible light mode, according to the state of the optical and electrical channels. After the AP adds corresponding identification information to the received terminal service data, it reports it to the data processing module, and the data processing module implements corresponding service processing on the service data. Therefore, using the communication method of the present invention, when one of the communication links is disconnected or the signal is weak, the other communication link can be used to realize the timely transmission of business data, for example, when the optical link is blocked and disconnected, Data can be transmitted in the electrical channel by means of radio. It can be seen that the present invention solves the problem that in the existing single communication mode, due to disconnection of the communication link, the timely upload of business data cannot be guaranteed by means of photoelectric cooperation.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a wireless access point AP disclosed in Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of a communication system disclosed in Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a visible light mobile terminal disclosed in Embodiment 2 of the present invention;

FIG. 4 is a schematic structural diagram of an environmental sensor terminal disclosed in Embodiment 2 of the present invention;

Fig. 5 is a schematic diagram of the occupancy status of the two channels when the photoelectric channel cooperatively completes the communication disclosed in the second embodiment of the present invention;

FIG. 6 is a schematic diagram of a data frame structure disclosed in Embodiment 2 of the present invention;

FIG. 7 is a flowchart of a communication method disclosed in Embodiment 4 of the present invention;

Fig. 8 is a centralized coordination communication process disclosed in Embodiment 4 of the present invention;

FIG. 9 is a communication process based on a protocol stack between a terminal and an AP disclosed in Embodiment 4 of the present invention;

FIG. 10 is another flow chart of the communication method disclosed in Embodiment 5 of the present invention;

Fig. 11 is a schematic diagram of the communication principle of the terminal based on the opportunistic network disclosed in the fifth embodiment of the present invention;

Fig. 12 is a schematic diagram of the layout of a mine integrated communication system disclosed in Embodiment 6 of the present invention;

FIG. 13 is a schematic diagram of channel occupation between a terminal and an AP for channel access and for sending data to the AP disclosed in Embodiment 6 of the present invention;

FIG. 14 is a schematic structural diagram of an aggregation frame disclosed in Embodiment 6 of the present invention;

Fig. 15 is a schematic structural diagram of a block acknowledgment frame disclosed in Embodiment 6 of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

This embodiment discloses a wireless access point AP, a communication system, and a communication method, which are used to implement a data communication function in a scene with a relatively complex environment (such as under a mine). The present invention will be described in detail below through various embodiments.

Embodiment one

Embodiment 1 of the present invention discloses a wireless access point AP. The AP corresponds to unique first identification information. Please refer to FIG. 1 . The AP includes a wireless transceiver module 101 and a visible light receiving module 102 .

The wireless transceiver module 101 is configured to transmit and receive data by radio.

Wherein, the function of the wireless transceiver module 101 can specifically be realized by using a Wi-Fi (Wireless High Fidelity) transceiver module or a wireless base station.

The visible light receiving module 102 is configured to receive data in a visible light communication manner.

The visible light receiving module 102 includes K PDs (Photo Diodes, photodiodes), each PD corresponds to unique second identification information, and K is a natural number greater than 1.

In order to provide support for subsequent various business processes, this embodiment assigns a unique network address to the AP, that is, an SSID (Service Set Identifier, service set identifier) number, and assigns a unique short address number to each PD.

The visible light hotspot coverage area of the visible light receiving module 102 is included in the wireless signal coverage area of the first wireless transceiver module 101 .

The AP in this embodiment realizes the coverage of radio and optical communication signals for the corresponding terminals in the mine through its included wireless base station and multiple PDs, and then provides support for the transmission of business data through optoelectronic coordination.

Embodiment two

Embodiment 2 discloses a communication system. As shown in FIG. 2 , the communication system includes the AP 100 disclosed in Embodiment 1 and N terminals 200 , the terminals 200 and the AP 100 communicate with each other, and a data processing module 300 is also included.

The communication system of the present invention can support the data transmission requirements of comprehensive services such as personnel positioning service, video return service, sensor monitoring data return service and alarm service.

Wherein, the terminal 200 includes a visible light mobile terminal and an environment sensor terminal, and the visible light mobile terminal corresponds to unique third identification information. .

As shown in FIG. 3 , the visible light mobile terminal includes a first Wi-Fi transceiver 301 , a first visible light emitting device 302 , a camera 303 and a first environment sensor 304 . Among them, the first Wi-Fi transceiver 301 is used to communicate with the AP in a radio manner, so as to realize the transmission of business data under the positioning service, video return service and sensor detection data return service; the first visible light sending module 302 It is used to communicate with the AP in the form of visible light communication to realize the transmission of business data under the positioning service, video return service and sensor detection data return service; the service data of the positioning service includes the third identification information of the visible light mobile terminal The service data of the video return service includes video data recorded by the camera 303 , and the service data of the sensor detection data return service includes environmental data detected by the first environmental sensor 304 .

In this embodiment, the miner carrying the LED lamp mining cap is used as a visible light mobile terminal, and the miner performs radio communication or visible light communication between the mining cap carried by the miner and the AP to realize the business data transmission of the above-mentioned various business types, so as to facilitate mine management. Personnel can understand the working conditions of miners from multiple dimensions at any time.

In order to facilitate the positioning of miners and realize the positioning of miners, this embodiment assigns a unique ID (IDentity, identification number) to each miner.

Specifically, the light emitting device can be integrated into the LED headlight power supply box on the miner's mining cap, the headlight is used as a visible light transmitter, and the Wi-Fi transceiver and camera are placed on the headlight, and at the same time on the mining cap Integrate all kinds of sensors required, such as temperature sensor, humidity sensor and gas sensor, etc. Therefore, miners can collect video data and various environmental data during underground work through the mining caps they carry, such as collecting temperature, humidity, gas conditions, etc. in the working area. Radio or visible light communication can collect data and upload its own ID, which is convenient for mine managers to locate miners at any time, and understand the working environment of the miners' working area such as temperature, humidity, gas status, etc., so as to facilitate subsequent safety prevention and control, etc. Work.

Referring to FIG. 4 , the environment sensor terminal specifically includes a second Wi-Fi transceiver 401 , a second visible light emitting device 402 and a second environment sensor 403 . Among them, the second Wi-Fi transceiver 401 is used to communicate with the AP by radio to realize the transmission of service data under the sensor detection data backhaul service; the second visible light sending module 402 is used to communicate with the visible light The communication method communicates with the AP to realize the transmission of service data under the sensor detection data return service; the service data of the sensor detection data return service also includes the environmental data detected by the second environmental sensor 403 .

Among them, the environmental sensor terminal is a fixed terminal placed at a fixed location under the mine, which integrates various required environmental sensors such as temperature sensors, humidity sensors, and gas sensors, and is used to collect environmental data at fixed locations under the mine. During implementation, a more comprehensive collection of environmental data in the underground area can be achieved by arranging sufficient density of environmental sensor terminals under the mine. The environmental sensor terminal has both Wi-Fi capability and visible light transmission capability, and can report the collected environmental data through radio or visible light communication with the AP.

The environmental sensor in the visible light mobile terminal is designed to collect the environmental data of the working area of the miners who are moving and may change the working site at any time, while the environmental sensor terminal is designed to collect the environmental data of the fixed area under the mine. The combination of the two It can make managers have a more comprehensive understanding of the status of the whole mine.

In this embodiment, the positioning service is carried out for visible light mobile terminals in view of the characteristics that miners move at any time. Therefore, services for visible light mobile terminals include positioning services, video backhaul services, and sensor monitoring data backhaul services; while for environmental sensor terminals, only video backhaul services and sensor monitoring data backhaul services are sufficient.

The data processing module 300 is configured to receive the service data sent by the AP, and process the service data according to the service type to which the service data belongs. For example, analyze the positioning data to realize the positioning of miners, analyze the environmental data measured by the sensor, and obtain the environmental conditions under the mine, etc.

Wherein, the data processing module 300 may specifically use a processing board, a server, etc., to realize processing functions for different business data.

Utilizing the system of the present invention, for the scene with good lighting facilities represented by the main roadway under the mine, a central photoelectric hybrid network can be used, that is, the AP is used as the central coordinator to enter its photoelectric coverage area based on a pre-established central protocol. The terminal performs channel access control, and uses visible light and Wi-Fi to complete the transmission of various business data under the mine, ensuring that when one of the channels (such as the optical channel) has a bad signal, another channel can be used for normal communication , A central network can realize real-time return of data, small service delay, and high network efficiency.

The central control work of the photoelectric hybrid network with a center (AP) is mainly divided into two processes: downlink and uplink:

The downlink is the communication with the terminal initiated by the AP, which is completed on the electrical channel and uses a complete Wi-Fi protocol. Specifically, the distributed coordination function or the centralized coordination function may be used for communication according to the adopted Wi-Fi version, or the distributed coordination function and the centralized coordination function may be combined for communication.

The uplink is the communication with the AP initiated by the terminal, using the complete Wi-Fi protocol and coordinated by the optical channel. Specifically, when sending data, it is necessary to decide to use only the electrical channel (when the quality of the optical channel is not good), only use the optical channel (when the quality of the electrical channel is not good), and use the optical channel to send simultaneously (when there is no channel quality report) according to the channel status. Please refer to FIG. 5 . FIG. 5 shows the occupancy status of the two channels when the photoelectric channels jointly complete the communication.

Wherein, the quality of the channel is used as the basis for judging the channel state, and the channel quality mainly refers to the strength of the received signal of the channel. In this embodiment, channel quality detection modules are respectively installed in the visible light mobile terminal and the PD receiver, and the threshold value threshold is set, and the channel quality is judged by detecting whether the received signal strength RSI is greater than or less than the threshold. Specifically, the electrical channel quality can be measured when the terminal receives downlink services, the optical channel quality can be uploaded by the terminal, and the channel quality is detected when the PD receives the data. The corresponding communication channel uploads data.

In the process of using the system of the present invention to complete data communication, the transmission of various business data adopts the form of data frames, and various data frames adopt the existing frame structure of Wi-Fi, as shown in Figure 6, the data frames include frame control, Terminal ID, FCS (Frame Check Sequence) and other fields.

In the communication system of this embodiment, radio and optical communication methods can be used for data transmission between the terminal and the AP, so as to overcome the problem that the business data cannot be uploaded in time due to the disconnection of the communication link in the existing single communication method. question.

Embodiment three

Embodiment 3 of the present invention supplements the communication system of Embodiment 2. Specifically, in this embodiment, the first Wi-Fi transceiver included in the visible light mobile terminal is also used to maintain the location information of the places that the visible light mobile terminal frequently visits and frequency information to reach the location, and broadcast the location information and frequency information.

In scenarios such as mine side roadways and mining faces, there are no lighting power lines or only limited lighting power lines, and the environment in this scene is harsh, the roadway is uneven, and landslides occur from time to time, which makes cable layout very inconvenient. Wi- The Fi base station is also not easy to install. Therefore, in this scenario, the visible light mobile terminal cannot directly access the central AP to report its service data. To solve this problem, in this embodiment, the visible light mobile terminal is added with the above functions. The scenario adopts the distributed network architecture of opportunistic network, that is, each visible light mobile terminal maintains the location information of its frequent arrival location and the frequency information of the location within a certain period of time, and broadcasts the maintained information periodically, so that there is communication After the required terminal receives the broadcast of each adjacent terminal, it selects the terminal with the highest frequency arriving at the central photoelectric hybrid area as the relay node for data forwarding. The data forwarding is specifically completed using the wireless Wi-Fi link between the terminals. The forwarded data includes data such as video and environmental monitoring values, ensuring the highest probability of data reaching the central AP.

The distributed network can realize the delayed return of data that could not be returned originally. For the specific scene under the mine, the present invention adopts a central photoelectric hybrid network and a distributed network based on an opportunistic network to realize full coverage of underground communication signals. , the two networks are in a complementary relationship, the switch between the central network and the opportunistic network can be automatically completed through the protocol, and the terminal does not need to perform any manual switching, thus, compared with the prior art, the present invention solves the problem of data blind spots.

Embodiment four

Embodiment 4 discloses a communication method based on the communication system disclosed in the above embodiments. In this embodiment, the communication method specifically uses a 5GHz radio working frequency band (MX2BCM4330 chip) and a visible light channel to complete the required communication work.

Referring to Figure 7, the above communication method includes the following steps:

S1: If the terminal can receive the request information from the AP, when the terminal receives the request information from the AP, it will use one of the following transmission methods to send service data to the AP according to the state of the optical and electrical channels: The radio method, the visible light communication method, and the coordinated method of radio and visible light communication are used at the same time.

Specifically, as shown in Figure 8, the AP broadcasts a beacon frame Beacon to each terminal in its signal coverage area through a Wi-Fi channel (radio channel) in order to ask the terminal whether there is data to send.

After the miners as visible light mobile terminals enter the working environment, the LED lights they carry start to illuminate, and the sensors and cameras collect the surrounding environmental parameters. At the same time, the Wi-Fi transceiver device included in the terminal monitors the electrical channel. If it can monitor the AP The request information sent, that is, specifically, the Wi-Fi transceiver device listens to the beacon frame Beacon sent by the AP within a superframe period, which means that the terminal is in a central photoelectric hybrid network, and the central protocol can be used to communicate with the AP. For communication, Wi-Fi channels and optical channels can be used in conjunction.

Still referring to Figure 8, each terminal parses the beacon frame after receiving the beacon frame from the AP, obtains the type of service allowed to be sent, and sends its own ID to the AP to compete for communication rights; after that, the AP queues up according to the received ID The polling frame poll is sent to the terminals within the coverage area, and each terminal node sends its own data frame data sequentially after receiving the polling frame. Specifically, the terminal queries the channel quality of the broadcast. If the signal strength of the optical channel is greater than the threshold, all data will be sent through the visible light channel; if the signal strength of the electrical channel is greater than the preset threshold, the data will be sent through the electrical channel; If the signal strength of the electrical and electrical channels is invalid, or the signal strength of the optical and electrical channels is greater than the preset threshold at the same time, the optical channel and the electrical channel will send data at the same time.

S2: The AP adds corresponding identification information to the service data according to the transmission mode of the service data, and sends the service data with the identification information added to the data processing module.

The step S2 specifically includes:

If the business data is transmitted by radio, the wireless transceiver module adds the first identification information to the business data, and sends the business data after adding the first identification information to the data processing module;

If the service data is transmitted through visible light communication, the PD receiving the service data adds the second identification information of the PD to the service data, and sends the service data added with the second identification information to the Data processing module;

If the service data is repeatedly transmitted by radio and visible light communication, the PD receiving the service data adds the second identification information of the PD to the service data, and adds the service data with the second identification information sent to the data processing module.

Specifically, after receiving the data frame sent by the terminal, for the data received through the electrical channel, the AP replies with an acknowledgment 1 to the terminal that sent the data through the electrical channel, and at the same time, the wireless base station adds the SSID number of the AP to the received data frame, And upload the data frame with the SSID number added to the data processing module; for the data received by the optical channel, the AP replies to the terminal via the electrical channel to confirm 2, and the PD receiving the data frame adds the PD short address in the data frame, And upload the data frame with the PD short address added to the data processing module; if both channels receive the data frame, the AP will reply confirmation 12 on the electrical channel, and compare the data information of the two paths at the same time. If the transmission data is repeated, for the repeated data frame, the corresponding PD short address is added to the data frame, and the data frame after adding the short address is uploaded to the data processing module.

Each PD and wireless base station is connected to a data processing module (such as a processing board) by using a data line, and shares a channel through time division multiplexing.

S3: The data processing module performs corresponding analysis and business processing on the business data according to the business type to which the business data to which the identification information is added belongs, and obtains a business processing result.

The above step S3 specifically includes:

If the service type of the service data after adding the first identification information is a positioning service, the data processing module locates the corresponding terminal according to the third identification information and the first identification information in the service data; The service type to which the service data after the identification information belongs is a positioning service, and the data processing module locates the corresponding terminal according to the third identification information and the second identification information in the service data;

If the service type of the service data after adding the identification information is a video return service, the data processing module performs video service processing on the service data;

If the service type of the service data after adding the identification information is a sensor detection data return service, the data processing module performs sensor data service processing on the service data.

Specifically, in this embodiment, the positioning service adopts the piggybacking mode of service transmission, that is, the data frame of the video data or the data frame of the sensor environment data carries the positioning information (terminal ID) required by the terminal positioning service.

If the data frame received by the data processing module is the data uploaded by the wireless base station in the AP, the data processing module locates the terminal according to the SSID number and the terminal ID carried in the data frame; if the data frame is the data uploaded by the PD, the data The processing module locates the terminal according to the PD short address and terminal ID carried in the data frame.

In addition, if the data in the data frame is video data, the data processing module will process the video data, analyze the dynamic working status and work track of the terminal, and if the data in the data frame is environmental data, the data processing module will The surrounding environment of the data analysis terminal. Specifically, the data processing module can perform various processing on the data it receives according to the pre-set processing logic, so as to facilitate various follow-up tasks, such as carrying out security prevention and control, scheduling control, etc.

The method in this embodiment corresponds to the communication system disclosed in Embodiment 2, that is, this embodiment only describes the communication process when the terminal is in a central photoelectric hybrid network.

Taking the visible light terminal as an example above, the central control communication process of the photoelectric hybrid network is introduced in detail. The data upload process of the environmental sensor terminal and the visible light mobile terminal is similar. The difference between the two is that the positioning service is carried out for the visible light mobile terminal. The environmental sensor terminal does not need to be positioned because it is arranged in a fixed position under the mine.

It should be noted that, during specific implementation, it is still necessary to assign a corresponding ID to each fixed environmental sensor terminal, and to correspond the sensor ID with its location one by one in advance, so that when the processing board receives the data of the sensor terminal, the integrated sensor terminal Analyze the data at the location to understand the mine environment.

When the present invention is applied, the terminal protocol stack and the AP protocol stack can be prepared in advance, and the data communication between the terminal and the AP can be realized based on the protocol stack. Please refer to FIG. 9 , which shows the communication process between the terminal and the AP based on the protocol stack. The environmental parameters collected by the sensor in the terminal and the video information recorded by the camera are decomposed into data packets after processing, and the data frame is formed in the form of data packet + network address + header in the network layer. After that, the data link layer encrypts the data frame, Convert the network address to a MAC (MediaAccess Control, media access control layer) address. The physical layer modulates the data into a physical layer signal through the wireless transmission module and the visible light transmission module and transmits it to the AP. The AP obtains the data information transmitted by the terminal in reverse steps. , where the network layer of the AP runs a fixed route, and sends the data information to a fixed processing board, and the processing board performs subsequent processing on the data information, for example, according to the terminal ID and PD short address (or AP network address) to obtain the location information of the terminal, etc.

In summary, the communication system provided by the embodiment of the present invention includes an AP, N terminals, and a data processing module, wherein the AP includes a wireless transceiver module and a visible light receiving module, and the AP can provide wireless communication to the mine terminal through the above two modules included in the AP. and visible light communication signals. In the communication method based on this communication system, when the terminal receives the request information from the AP, it sends service data to the AP in a radio mode or a visible light mode, or in a coordinated radio and visible light mode, according to the state of the optical and electrical channels. After the AP adds corresponding identification information to the received terminal service data, it reports it to the data processing module, and the data processing module implements corresponding service processing on the service data. Therefore, using the communication method of the present invention, when one of the communication links is disconnected or the signal is weak, the other communication link can be used to realize the timely transmission of business data, for example, when the optical link is blocked and disconnected, Data can be transmitted in the electrical channel by means of radio. It can be seen that the present invention solves the problem that in the existing single communication mode, due to disconnection of the communication link, the timely upload of business data cannot be guaranteed by means of photoelectric cooperation.

Embodiment five

The communication method in Embodiment 4 can be applied to scenarios where centrally controlled optoelectronic hybrid networks are used, such as main tunnels and sub-tunnels under the mine. The terminal can access the network under the coordination of the central AP, and complete the transaction of its business data through direct communication with the AP. transmission.

Embodiment 5 expands the communication method of Embodiment 4. For scenarios where it is not easy to deploy central APs under mines such as side roadways and mining faces, an opportunistic network constructed between terminals can be used for data forwarding, which can be used as a relay node. When the terminal enters the entrance of the mining face and sub-tunnel, that is, when it enters the coverage area of the photoelectric hybrid network with the central AP, the buffered data is forwarded to the AP using the photoelectric hybrid network controlled by the center.

Please refer to Figure 10, the extended communication method also includes

S4: If the terminal cannot receive the request information from the AP, the terminal selects other terminals as relay nodes from the opportunistic network by using the opportunistic network constructed between the terminals based on the maximization criterion of the probability of data reaching the AP the optimal relay path, and send service data carrying additional positioning information to the AP through the optimal relay path, wherein the additional positioning information includes the forwarding time of the service data of the terminal on the relay path and the group number of the group where the terminal is located.

First of all, because the environment such as side roadway and mining face does not have a central AP, in order to realize the positioning of the terminal in such an environment, this embodiment divides the miners into different jobs according to different types of workers such as electric fitters, demolition workers, monitoring workers, and gas inspection workers. Groups, and number each group separately, each member in the group will maintain the location information of the places he often visits and the frequency information of the places he arrives within a certain period of time, and each member will periodically broadcast the information he maintains . Subsequently, the group ID where the terminal is located and the time it takes for the terminal to forward data can be used as the basis for locating the terminal in the opportunistic network.

When a miner as a visible light mobile terminal enters an area with extremely harsh environmental conditions such as a side roadway or a mining face, the terminal cannot receive the beacon frame broadcast by the central AP. Photoelectric hybrid network access mechanism. That is, specifically, a prediction-based opportunistic network forwarding routing mechanism. Each terminal node maintains a predicted probability of meeting the target node (central control node). Specifically, the probability can be predicted through the node's trajectory, that is, the probability of meeting is estimated by using the node's mobility model, and the optimal node is selected to forward data.

As shown in FIG. 11 , a source node represents a terminal that needs to upload data, and a relay node represents a terminal on a data forwarding path. The source node that needs to upload data, after receiving the broadcast from the nearby nodes, selects the optimal node, that is, selects the node with the highest frequency of reaching the central photoelectric hybrid area as the relay node for data forwarding, as shown in Figure 11, the source node The node first selects the relay node 1 as the first optimal node, and realizes the transmission of data from the source node to the relay node 1 through handshake, and at the same time, the relay node 1 caches the data of the source node. After that, the relay node 1 adopts In the same way, the data is transmitted and cached in the second optimal node, that is, the relay node 2. If the relay node 2 can realize the connection with the wireless base station and the PD receiver, the source node data cached by the relay node 2 Upload to the central AP through the photoelectric hybrid network, thereby realizing the data connection between the mining face and the central AP, and ensuring the maximum probability of the terminal data at the mining face reaching the central node.

Specifically, the relay node 2 can select an appropriate communication mode to upload the data of the source node to the AP according to the quality of the optical channel.

The data forwarded by the terminal includes data such as video or environmental monitoring values, as well as the terminal ID number, group number and data forwarding time of the source node.

S5: The AP adds corresponding identification information to the service data according to the receiving manner of the service data carrying the additional positioning information, and sends the service data with the identification information added to the data processing module.

If the AP receives the service data carrying additional positioning information by radio, the wireless transceiver module of the AP adds first identification information to the service data, and sends the service data after adding the first identification information to the data processing module;

If the AP receives the service data carrying additional positioning information by radio, the PD receiving the service data in the AP adds the second identification information of the PD to the service data, and adds the second Send the business data after the identification information to the data processing module;

If the AP repeatedly receives service data carrying additional positioning information through radio and visible light communication, the PD receiving the service data in the AP adds the second identification information of the PD to the service data, and adds The business data with the second identification information is sent to the data processing module.

S6: The data processing module performs corresponding analysis and business processing on the business data according to the business type described in the business data carrying additional positioning information after adding the identification information, and obtains a business processing result.

Among them, for the data uploaded by the wireless base station, the back-end processing module locates the terminal according to the SSID, terminal ID, group number of the terminal in the received data frame and the data data forwarding time; for the data uploaded by the PD, the back-end processing module The terminal is positioned according to the PD short address, terminal ID, group number of the terminal and the data forwarding time in the received data frame, thus solving the problem of terminal positioning in scenarios where it is difficult to deploy central APs such as mining faces and side roadways.

The processing process of data of other business types (video data, environment data) is the same as that of the corresponding business data of terminals in the main roadway, and will not be described in detail.

In this embodiment, an opportunistic network-based photoelectric hybrid network access mechanism is adopted in the mining face and side roadways, and the opportunistic network is used to supplement the central photoelectric hybrid network. The integration of the two network forms can realize full coverage of the underground communication network. , which solves the problem of blind spots in data communication.

Embodiment six

In actual application scenarios, full coverage of the communication network can be achieved by deploying sufficient density of APs according to actual needs, as shown in Figure 12, which is a schematic diagram of the layout of a mine integrated communication system based on the present invention.

Next, the sixth embodiment discloses a practical application scenario of the present invention.

In this scenario, the main roadway under the mine is divided into multiple cells in units of 70m. Each cell has a network element responsible for the communication work of the cell. Each network element is equipped with an AP. The AP consists of a wireless base station and 10 Visible light receiving PD constitutes (that is, a PD receiver is laid out on average 7m).

After the terminal enters the main roadway, it continuously obtains data information such as surrounding temperature and humidity, gas concentration, and video through its included sensors and cameras within its range of activities, and caches the acquired data information. When the terminal receives the polling request from the AP, Query the channel quality reported by the physical layer, and select an appropriate communication channel according to the channel quality to upload the acquired environment or video information to the AP. Please refer to Figure 13. Complete the process of data transfer. Wherein, if the wireless base station receives the data information, it adds the SSID of the AP to the data information and reports it, and if the PD receives the data information, it adds the PD short address and reports it, so as to realize terminal positioning. Wherein, the polling list of the AP is continuously updated according to the continuous movement of the terminal.

During the communication process, the terminal uses the frame aggregation method (A-MPDU aggregation frame) to send data. The frame structure is shown in Figure 14, and the block confirmation frame (specifically, the BA block confirmation frame) is used for centralized confirmation, as shown in Figure 15.

Among them, the communication between the LED headlight of the terminal and the PD receiver adopts the modulation method of On-Off Keying (OOK, On-Off Keying). To the PD receiver, the signals it transmits are "0" and "1". After receiving the signal, the PD receiver uses a decoder to demodulate the signal to obtain the data information sent by the terminal.

In the harsh environments such as side roadways or mining surfaces, where it is inconvenient to deploy central APs, a distributed network architecture is adopted, and in the side roadways, the interval between network elements is shortened according to the specific environmental conditions of the roadway, and PD receivers are added in necessary areas. Density approach to ensure communication coverage in side lanes.

When the terminal enters the side roadway or mining face, the opportunistic network communication method based on the encounter probability prediction routing mechanism is adopted. When the source node has data transmission needs, it first finds the optimal node nearby as the first relay node, and the source node and The first relay node uses the wireless Wi-Fi link to realize data transmission and cache through handshake; the first relay node uses the same method to transmit and cache data in the next relay node until the last relay When the node can realize the connection with the wireless base station and the PD receiver, the relay node will upload the data to the server through the photoelectric hybrid network to realize the data connection between the mining surface terminal and the central server.

To sum up, the present invention uses the two network forms of the central network group and the opportunistic network to complement each other, and completes the full coverage of the network under different environments such as the main roadway, side roadway, and mining face of the mine, and solves the problem caused by the difficulty in laying out the communication network. At the same time, the present invention uses visible light and radio media resources to cooperate with each other. When one of the communication links is disconnected, another link is used to transmit data, which realizes real-time return of data and business hours. Small extension and high network efficiency; in addition, the present invention also has the advantages of high positioning accuracy and fast transmission rate.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present application, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

It can be known from the above description of the implementation manners that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the essence of the technical solution of this application or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present application.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (14)

1. A kind of 1. communication system, it is characterised in that including wireless access points AP and N number of terminal, the terminal with it is described AP is in communication with each other, and the AP includes radio receiving transmitting module and visible Optical Receivers, wherein：The radio receiving transmitting module, is used for With wireless system transceiving data；The visible Optical Receivers, for receiving data with line-of-sight propagation；It is described visible The visible ray hot spot coverage of Optical Receivers is included in the wireless signal overlay area of the radio receiving transmitting module；

   The terminal comprises at least visible ray mobile terminal, and the visible ray mobile terminal comprises at least the first Wi-Fi transceiver, For being communicated with wireless system with the AP, to realize the transmission of the business datum of intended service type；Described first Wi-Fi transceiver is additionally operable to safeguard the positional information in the place that the visible ray mobile terminal often reaches and reaches the place Frequency information, and broadcast the positional information and frequency information, build a kind of opportunistic network to realize, and then cause there is communication The visible ray mobile terminal of demand is after the broadcast message of each adjacent visible ray mobile terminal is received, according to the broadcast letter received Cease and chosen in the opportunistic network formed from each adjacent visible ray mobile terminal up to the frequency for having center photoelectricity Mixed Zone Maximum visible ray mobile terminal carries out data forwarding as via node；

   The system also includes：Data processing module, the business datum sent for receiving the AP, and according to the business number Corresponding service processing is carried out to the business datum according to affiliated type of service.
2. 2. system according to claim 1, it is characterised in that the AP corresponds to unique first identification information.
3. 3. system according to claim 1, it is characterised in that the visible Optical Receivers includes K photodiode PD, each PD correspond to unique second identification information, and the K is the natural number more than 1.
4. 4. communication system according to claim 2, it is characterised in that the type of service specifically includes positioning service, regarded Frequency passed-back traffic and sensor detection data passed-back traffic.
5. 5. communication system according to claim 4, it is characterised in that the terminal includes visible ray mobile terminal and environment Sensor terminal, the visible ray mobile terminal correspond to unique 3rd identification information.
6. 6. communication system according to claim 5, it is characterised in that the visible ray mobile terminal specifically also includes first VISIBLE LIGHT EMISSION device, camera and first environment sensor, wherein：

   The first VISIBLE LIGHT EMISSION device, for being communicated with line-of-sight propagation with the AP, to realize positioning industry The transmission of business datum under business, video passed-back traffic and sensor detection data passed-back traffic；

   The business datum of the positioning service includes the 3rd identification information, and the business datum of the video passed-back traffic includes The video data that the camera is recorded, the business datum of the sensor detection data passed-back traffic include first ring The environmental data that border sensor is detected.
7. 7. communication system according to claim 5, it is characterised in that the environmental sensor terminal specifically includes second Wi-Fi transceiver, the second VISIBLE LIGHT EMISSION device and second environment sensor, wherein：

   Second Wi-Fi transceiver, for being communicated with wireless system with the AP, to realize that the sensor detects The transmission of business datum under data back business；

   The second visible optical transmission module, for being communicated with line-of-sight propagation with the AP, to realize the biography The transmission of business datum under sensor detection data passed-back traffic；

   The business datum of the sensor detection data passed-back traffic also includes the environment that the second environment sensor is detected Data.
8. A kind of 8. communication means, based on the communication system as described in claim 5-7 any one, it is characterised in that including：

   If the terminal can receive AP solicited message, the terminal when receiving AP solicited message, according to light, Radio channel state is correspondingly using a kind of to AP transmission business datums in following transmission means：Wireless system, can be by light Communication mode at the same using radio and visible light communication collaboration by the way of；

   The AP adds respective identification information to the business datum according to the transmission means of the business datum, and addition is marked Know the business datum after information to send to the data processing module；

   The data processing module is according to the type of service belonging to the business datum after the addition identification information to the business Data carry out corresponding analysis and business processing, obtain service processing result.
9. 9. communication means according to claim 8, it is characterised in that the terminal when receiving AP solicited message, According to light, radio channel state correspondingly using a kind of to AP transmission business datums in following transmission means：Wireless system, Line-of-sight propagation at the same using radio and visible light communication collaboration by the way of, specifically include：

   If optical channel signal intensity is more than predetermined threshold value, the terminal sends the business number using line-of-sight propagation According to；

   If radio channel signal intensity is more than predetermined threshold value, the terminal sends the business datum using wireless system；

   If optical channel and radio channel signal intensity are invalid, or light, radio channel signal intensity are simultaneously greater than predetermined threshold value, then described Terminal sends the business datum using wireless system and line-of-sight propagation collaboration simultaneously.
10. 10. communication means according to claim 8, it is characterised in that transmission sides of the AP according to the business datum Formula adds respective identification information to the business datum, and the business datum after addition identification information is sent to the data Module is managed, is specifically included：

    If the business datum is transmitted by wireless system, radio receiving transmitting module adds described in the business datum One identification information, and the business datum after the first identification information of addition is sent to the data processing module；

    If the business datum is transmitted by line-of-sight propagation, the PD of the business datum is received in the business datum The upper addition PD the second identification information, and the business datum that with the addition of the second identification information is sent to the data processing Module；

    If the business datum repeats to transmit by wireless system and line-of-sight propagation, the business datum is received PD adds the second identification information of the PD in the business datum, and the business datum that with the addition of the second identification information is sent out Deliver to the data processing module.
11. 11. communication means according to claim 10, it is characterised in that the data processing module is according to the addition mark Know information after business datum belonging to type of service to it is described addition identification information after business datum carry out corresponding analysis and Business processing, specifically include；

    If the type of service belonging to business datum after the first identification information of addition is positioning service, the data processing module Positioned according to the 3rd identification information in the business datum and the first identification information pair corresponding terminal；If the mark of addition second The type of service known belonging to the business datum after information is positioning service, then the data processing module is according to the business datum In the 3rd identification information and the second identification information pair corresponding terminal positioned；

    If the type of service belonging to business datum after addition identification information is video passed-back traffic, the data processing module Video traffic processing is carried out to the business datum；

    If add the type of service belonging to the business datum after identification information detects data passed-back traffic, the number for sensor Sensing data business processing is carried out to the business datum according to processing module.
12. 12. according to the communication means described in claim 8-11 any one, it is characterised in that also include：

    If the terminal can not receive AP solicited message, the terminal reaches AP maximization criterion based on data Using the opportunistic network built between terminal, optimal relaying of the selection using other-end as via node from the opportunistic network Path, and the business datum for carrying additional position information is sent to the AP by the optimal relay route, wherein, it is described attached An information of reordering includes the group of business datum group where the forwarding time of relay route and the terminal of the terminal Number；

    The AP adds phase according to the reception mode of the business datum to the carrying additional position information to the business datum Answer identification information, and send the business datum after identification information is added to the data processing module；

    Industry of the data processing module described according to the business datum of the carrying additional position information after adding identification information Service type, corresponding analysis and business processing are carried out to the business datum, obtain service processing result.
13. 13. communication means according to claim 12, it is characterised in that the AP carries additional positioning letter according to described The reception mode of the business datum of breath adds respective identification information to the business datum, and will add the industry after identification information Business data are sent to the data processing module, are specifically included：

    If the AP receives the business datum of the carrying additional position information, AP wireless receiving and dispatching mould by wireless system Block adds first identification information in the business datum, and the business datum after the first identification information of addition is sent out Deliver to the data processing module；

    If the AP receives the business datum of the carrying additional position information by visible ray mode, the industry is received in AP The PD of business data adds the second identification information of the PD, and the institute that will with the addition of the second identification information in the business datum Business datum is stated to send to the data processing module；

    If the AP repeats to receive the business datum for carrying additional position information by wireless system and line-of-sight propagation, The PD that the business datum is then received in AP adds the second identification information of the PD in institute's business datum, and will with the addition of The business datum of two identification informations is sent to the data processing module.
14. 14. communication means according to claim 13, it is characterised in that the data processing module foundation adds identification information Type of service described in the business datum of the carrying additional position information afterwards, to the business datum carry out corresponding analysis and Business processing, specifically include：

    If it is positioning to add the type of service belonging to the business datum of the carrying additional position information after the first identification information Business, then the data processing module according to the first identification information in the business datum, the 3rd identification information, small group number with And forwarding time positions to corresponding terminal；If add the business of the carrying additional position information after the second identification information Type of service belonging to data is positioning service, then the data processing module is according to the second mark letter in the business datum Breath, the 3rd identification information, small group number and forwarding time position to corresponding terminal；

    If it is video passed-back traffic to add the type of service belonging to the business datum of the carrying additional position information after identification information, Then the data processing module carries out video traffic processing to the business datum；

    If it is sensor testing number to add the type of service belonging to the business datum of the carrying additional position information after identification information According to passed-back traffic, then the data processing module is to business datum progress sensing data business processing.