CN104967969A - Multi-rate anti-interference adaptive radio communication platform and deciding method thereof - Google Patents
Multi-rate anti-interference adaptive radio communication platform and deciding method thereof Download PDFInfo
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Abstract
The invention provides a multi-rate anti-interference adaptive radio communication platform. The communication platform is mainly composed of a control unit, a radio transmission unit and a sensor unit. The control unit is used for communication mode deciding and switching, and communication protocol realizing. The radio transmission unit is used for wireless data transmission of the platform. The sensor unit is used for acquiring the environment and image information around the platform. The control unit serves as the scheduling and controlling center of the platform and selects different communication means according to different transmission distances with adjacent communication nodes. The platform has the beneficial effects of switching three radio communication means in an adaptive way according to multiple application demands and channel environment changes. Real-time detection can be performed. A rapid optimization decision can be made. Three communication means are incorporated in one system. Data can be converted in a mutual way. Information exchanges among different communication modes can be achieved.
Description
Technical field
The present invention relates to wireless communication technology field, especially self adaptation switches communication mode.
Background technology
Along with the development gradually of radio network technique, no matter be under the application conditions of industry control occasion, or in common life application, the wireless transmission of short-distance and medium-distance all receive very close concern.The features such as short-distance and medium-distance WLAN (wireless local area network) has that equipment is simple, MANET, highly reliable, low cost, and gradually be applied to every field.Current short-distance and medium-distance wireless communication technology mainly comprises: Wireless Fidelity (WiFi), short-distance wireless communication technology (Zigbee), superfrequency (UHF) technology etc.How dynamic the single communication technology cannot meet, and self adaptation, multi tate is adjustable, and jamproof requirement.Wireless Fidelity (WiFi), short-distance wireless communication technology (Zigbee) and superfrequency (UHF) three kinds of wireless communication technologys merge by the anti-interference adaptive communication platform of multi tate that therefore the present invention proposes, by assessing the adaptive switching communication mode of change of channel situation and application demand, and then realize robustness and the optimization of wireless network performance.Below the features and application occasion of three kinds of wireless communication technologys is analyzed.
Zigbee is the low-power consumption territory fidonetFido based on IEEE802.15.4 standard, and the characteristics such as its low rate, low-power consumption, low cost become the main support technology of wireless sensor network.Zigbee, as a kind of emerging short-distance wireless communication technology, is just promoting the development of low rate wireless personal local area network network.
WiFi technology, mainly based on IEEE 802.11 series standard, is the technology that the terminals such as PC, handheld device (as dull and stereotyped, mobile phone) can wirelessly be connected to each other by one.Different from the characteristic such as low rate, low-power consumption of ZigBee technology, WiFi technology has the features such as two-forty, highly reliable, low delay.
Superfrequency (UHF) then refers to that use frequency range is the wireless communication technology of 300 ~ 3000MHz superfrequency, has stability high, the feature that radianting capacity is strong.And UHF communication technology terminal is practical, easy hardware or hardware interface can be utilized to carry out high-speed traffic.Relative to Zigbee and Wifi Radio Transmission Technology, have low rate, penetrability is strong, and the feature of long transmission distance, can be used for the wireless transmission of short-distance and medium-distance.
Wireless Fidelity (WiFi) has message transmission rate at a high speed, supports multiple access.But working frequency range exempts from application 2.4Ghz ISM (Industrial Scientific Medical frequency range) channel in the whole world, frequency range is higher, and interference is strong, and the loss of propagation path is large, and transmission range is near, and cannot support multi-hop transmission.Secondly the power consumption of Wifi Radio Transmission Technology is large, does not support the wireless sensor network to energy-sensitive.Zigbee has low-power consumption, supports the feature such as wireless self-networking, compatible multi-hop transmission pattern.But the message transmission rate of Zigbee is low, multi-hop transmission can cause the time delay of transfer of data comparatively large, cannot meet the application that real time data is mutual.UHF radianting capacity is strong, and penetration power is good, in the indoor environment that barrier is more, and long transmission distance.In an outdoor environment, can single-hop transmission data for the horizon grange within 10Km, reduce the time delay of transfer of data.
Summary of the invention
In order to the range of application overcoming single communication mode in existing wireless communications technology is narrow, message transmission rate is non-adjustable, cannot switching at runtime frequency range anti-interference, and the feature that low-power consumption is energy-conservation, analyze and find above-mentioned three kinds of wireless communication technologys to merge, realized the switching of various wireless communication technology by adaptive algorithm.The main control chip of radio communication platform selects on-site programmable gate array FPGA to realize self adaptation switching communication mode algorithm.Digital Logic in fpga chip is mainly through acquisition applications condition, and data delay requirement, wireless channel disturbed condition, and the information such as platform energy, analyze judgement dynamically, finally realize the switching of three kinds of communications.
The technical solution adopted for the present invention to solve the technical problems is:
The hardware system of the anti-interference adaptive wireless communications platform of multi tate mainly comprises: control unit 1, wireless transmission unit 2 and sensor unit 3 three part form; Control unit 1, primarily of on-site programmable gate array FPGA composition, is responsible for the judgement of communication pattern and the realization of switching and communication protocol; Wireless transmission unit 2 is made up of UHF wireless module 21, Wifi wireless module 22 and Zigbee wireless module 23, is responsible for the wirelessly transmitting data of platform; Sensor unit 3 is primarily of Temperature Humidity Sensor 31, and imageing sensor 32 and acceleration transducer 33 form, and is responsible for the environment around acquisition platform and image information;
Described control unit 1 is as the scheduling and controlling center of platform, and wireless transmission unit 2 is connected with control unit 1 by electric interfaces with sensor unit 3, as peripheral hardware, completes fixed function;
Described wireless transmission unit 2 is by UHF wireless module 21, Wifi wireless module 22 and Zigbee wireless module 23 form, and three wireless modules are connected with the FPGA of control unit 1 by integrated circuit (IC) bus IIC, synchronous serial Peripheral Interface SPI, general-purpose serial bus USB, asynchronous serial port interface RS232;
Described sensor unit 3 is primarily of humidity sensor 31, and imageing sensor 32 and GPS Global Positioning System Sensor Unit 33 form; After radio communication platform powers on, humidity sensor 31, imageing sensor 32 and global position system GPS transducer 33 complete initialization, wait for FPGA control signal; After control unit 1FPGA sends request the order of data by integrated circuit (IC) bus IIC, synchronous serial Peripheral Interface SPI, general-purpose serial bus USB, asynchronous serial port interface RS232 communication interface, transducer reads command adapted thereto, the humiture data of collection, geographic coordinate information are sent to the FPGA of control unit 1 by above-mentioned communication interface, corresponding data are kept in internal memory by FPGA;
Described FPGA switches selection Wireless Fidelity WiFi, short-distance wireless communication Zigbee, superfrequency UHF tri-kinds of communications, then the enable signal of wireless communication module is drawn high, by general Data Transport Protocol by Packet Generation to wireless transport module, wireless transport module by receive data pack buffer in the internal memory of this locality, then sent by wireless link, when data are sent, return data end of transmission signal is to FPGA; The transmission of digital signal is, by FPGA, the data that the control command selecting to launch or transducer obtain are passed to above-mentioned three kinds of wireless transport modules, and then wireless module is data cached, by modulation, data is launched by wireless channel.
The present invention also provides and relates to the method that control unit 1 carries out decision-making and analysis.
Control unit 1 of the present invention is responsible for the task scheduling of whole radio communication platform, and communication protocol realizes, Data Analysis Services, and the function that communication mode switches, and specific implementation step is:
Step 1: whole radio communication platform power-up initializing parameter or enter resting state after setting up timed task;
Step 2: arrive when there being request of data or the arrival of timed task time, the FPGA internal logic of control unit 1 wakes up automatically, carries out the transmission of data task;
Step 3: control unit 1 completes wireless sensor data acquisition tasks;
Step 4: control unit 1 is before carrying out Wireless Data Transmission, and advanced Mobile state decision-making, selects optimized communication to complete switching;
Described dynamic decision and the optimized concrete determination methods of selection are:
Step 4.1: the first analysis and calculation of FPGA of control unit 1 and the transmission range of adjacent communication node, communication distance parameter is calculated by the geographical coordinate of acquisition self and communication node, the geographical coordinate of self is initiatively carried when external node transmission packet or instruction, the information containing neighbors geographical coordinate received is stored in local internal memory by radio communication platform, and described neighbors refers to the node only having single-hop transmission distance apart from this node;
Step 4.2: when the transmission range of radio communication platform and neighbors is greater than 1km, control unit 1 selects UHF21 communication, after enable for UHF21 wireless communication module, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.3: within the distance of communication distance at 100m ~ 1000m, and when the channel of 2.4Ghz does not exist interference, open the radio frequency amplifier of Zigbee23, enable select Zigbee23 communication after, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.4: if there is larger channel fading or artificial interference in 2.4Ghz frequency range, after the UHF21 communication of enable selection 433Mhz, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.5: if transmission range is within 100m, data transmission delay requires little, and data task amount is large, adopts Wifi22 to carry out transfer of data, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.6: if do not require data delay, and channel disturbance is not serious, namely the radio band transmission data of 2.4Ghz are adopted, the error rates of data that neighbors receives is low, reply handshaking information that can be correct, adopt the Zigbee23 Wireless Data Transmission of low-power consumption, Exit Decision-making deterministic process, start communication data transfer;
Step 5: control unit 1 carries out the transmission of data after selecting communication mode by decision optimization in step 4, in addition communication protocol is for control command, the view data of short byte data and slab adopts different Handshake Protocols to carry out data interaction respectively: byte number is less than the packet of 64bytes, adopts and shakes hands for twice; Be greater than the view data of 64bytes, carry out Data Segmentation, every 64bytes is packaged into a Frame, then adopts and repeatedly shakes hands, send packet continuously;
Step 6: control unit 1, after having carried out data transfer task, again arranges task timing, otherwise enters resting state.
The invention has the beneficial effects as follows owing to can realize according to the multiple application demand of platform and channel circumstance change, adaptive switching three kinds of communications, control unit can carry out real-time detection to the application requirement of radio communication platform, message transmission rate, delay requirement, channel disturbance situation and platform energy; According to the information gathered, carry out optimization judgement fast, switch communication, control unit devises a set of communication protocol in addition, and merge three kinds of communication modes a system, data can be changed mutually, are multiple gateway systems; Data interaction can be carried out with the node carrying single communication pattern, and data are launched by another kind of communication pattern, realize the information exchange between different communication modes.
Accompanying drawing explanation
Fig. 1 is the hardware system framework of the anti-interference adaptive wireless communications platform of multi tate.
Fig. 2 is the mission flow diagram of whole radio communication platform.
Fig. 3 is the flow chart that control unit dynamic decision selects communication mode.
Fig. 4 is the communication protocol adopting single handshake method between node.
Fig. 5 is twice handshake communication agreement of mutual short byte data between node.
Fig. 6 is the repeatedly handshake communication agreement of interaction figure picture and slab data between node.
Fig. 7 is that the node of multiple different communication mode realizes the transfer of data of across a network with mutual.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
The hardware system of the anti-interference adaptive wireless communications platform of multi tate mainly comprises: control unit 1, wireless transmission unit 2 and sensor unit 3 three part form.Control unit 1, primarily of on-site programmable gate array FPGA composition, is responsible for the judgement of communication pattern and the realization of switching and communication protocol; Wireless transmission unit 2 is made up of UHF wireless module 21, Wifi wireless module 22 and Zigbee wireless module 23, is responsible for the wirelessly transmitting data of platform; Sensor unit 3 is primarily of Temperature Humidity Sensor 31, and imageing sensor 32 and acceleration transducer 33 form, and is responsible for the environment around acquisition platform and image information.
Described control unit 1 is as the scheduling and controlling center of platform, and wireless transmission unit 2 is connected with control unit 1 by electric interfaces with sensor unit 3, as peripheral hardware, completes fixed function.
Described wireless transmission unit 2 is by UHF wireless module 21, Wifi wireless module 22 and Zigbee wireless module 23 form, and three wireless modules are connected with the FPGA of control unit 1 by integrated circuit (IC) bus IIC, synchronous serial Peripheral Interface SPI, general-purpose serial bus USB, asynchronous serial port interface RS232.
Described sensor unit 3 is primarily of humidity sensor 31, and imageing sensor 32 and GPS Global Positioning System Sensor Unit 33 form.After radio communication platform powers on, humidity sensor 31, imageing sensor 32 and global position system GPS transducer 33 complete initialization, wait for FPGA control signal.After control unit 1FPGA sends request the order of data by integrated circuit (IC) bus IIC, synchronous serial Peripheral Interface SPI, general-purpose serial bus USB, asynchronous serial port interface RS232 communication interface, transducer reads command adapted thereto, the humiture data of collection, geographic coordinate information are sent to the FPGA of control unit 1 by above-mentioned communication interface, corresponding data are kept in internal memory by FPGA.
Described FPGA switches selection Wireless Fidelity WiFi, short-distance wireless communication Zigbee, superfrequency UHF tri-kinds of communications, then the enable signal of wireless communication module is drawn high, by general Data Transport Protocol by Packet Generation to wireless transport module, wireless transport module by receive data pack buffer in the internal memory of this locality, then sent by wireless link, when data are sent, return data end of transmission signal is to FPGA.The transmission of digital signal is, by FPGA, the data that the control command selecting to launch or transducer obtain are passed to above-mentioned three kinds of wireless transport modules, and then wireless module is data cached, by modulation, data is launched by wireless channel.
The electric connecting relation of three parts as shown in Figure 1.Control unit 1 is responsible for the task scheduling of whole radio communication platform, and communication protocol realizes, Data Analysis Services, and the function that communication mode switches.As shown in Figure 2, resting state is entered after whole radio communication platform power-up initializing parameter.Arriving when there being request of data or the arrival of timed task time, automatically waking up, carrying out the transmission of data task.Control unit 1, before carrying out data wireless transmission, according to Fig. 3, is selected optimized communication, is completed switching.
Control unit 1 of the present invention is responsible for the task scheduling of whole radio communication platform, and communication protocol realizes, Data Analysis Services, and the function that communication mode switches, and the step of concrete dispatching method is:
Step 1: whole radio communication platform power-up initializing parameter or enter resting state after setting up timed task;
Step 2: arrive when there being request of data or the arrival of timed task time, the FPGA internal logic of control unit 1 wakes up automatically, carries out the transmission of data task;
Step 3: control unit 1 completes wireless sensor data acquisition tasks;
Step 4: control unit 1 is before carrying out Wireless Data Transmission, and advanced Mobile state decision-making, selects optimized communication to complete switching;
Described dynamic decision and the optimized concrete determination methods of selection are:
Step 4.1: the first analysis and calculation of FPGA of control unit 1 and the transmission range of adjacent communication node, communication distance parameter is calculated by the geographical coordinate of acquisition self and communication node, the geographical coordinate of self is initiatively carried when external node transmission packet or instruction, the information containing neighbors geographical coordinate received is stored in local internal memory by radio communication platform, and described neighbors refers to the node only having single-hop transmission distance apart from this node;
Step 4.2: when the transmission range of radio communication platform and neighbors is greater than 1km, control unit 1 selects UHF21 communication, after enable for UHF21 wireless communication module, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.3: within the distance of communication distance at 100m ~ 1000m, and when the channel of 2.4Ghz does not exist interference, open the radio frequency amplifier of Zigbee23, enable select Zigbee23 communication after, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.4: if there is larger channel fading or artificial interference in 2.4Ghz frequency range, after the UHF21 communication of enable selection 433Mhz, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.5: if transmission range is within 100m, data transmission delay requires little, and data task amount is large, adopts Wifi22 to carry out transfer of data, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.6: if do not require data delay, and channel disturbance is not serious, namely the radio band transmission data of 2.4Ghz are adopted, the error rates of data that neighbors receives is low, reply handshaking information that can be correct, adopt the Zigbee23 Wireless Data Transmission of low-power consumption, Exit Decision-making deterministic process, start communication data transfer;
Step 5: because wireless link environment change is fast, stable row is poor, there is data collision and error code, therefore needs repeatedly handshaking information mutual, ensures the correct transmission of data.
Control unit 1 carries out the transmission of data after selecting communication mode by decision optimization in step 4, in addition communication protocol is for control command, the view data of short byte data and slab adopts different Handshake Protocols to carry out data interaction respectively: byte number is less than the packet of 64bytes, adopts and shakes hands for twice; Be greater than the view data of 64bytes, carry out Data Segmentation, every 64bytes is packaged into a Frame, then adopts and repeatedly shakes hands, send packet continuously;
Step 6: control unit 1, after having carried out data transfer task, again arranges task timing, otherwise enters resting state.
Wherein Fig. 4 is that the single that radio communication platform periodically sends Hello (greeting) signal is shaken hands.The network address information of radio communication platform is carried, geographical location information, energy information in Hello packet.The mainly state of neighbors broadcast towards periphery oneself, for setting up route.Fig. 5 is short byte data and orders mutual process of shaking hands for twice.First radio communication platform sends Hello signal to the neighbors that will receive data.After receiving the Hello signal of receiving node reply, determine that facing node is in the state of answering, and sends the packet of a frame, and the return signal of wait-receiving mode node.After receiving node replys the correct signal of reception packet within a certain period of time, a DTD of radio communication platform, otherwise perform said process continuation data retransmission.If when data interaction is initial, the Hello information that radio communication platform sends is not replied within a period of time, then continue repeated attempt 2 times.If repeatedly attempt coming to nothing, turn back to communication mode decision process, again decision-making.The image information of big data quantity adopts the mechanism of repeatedly shaking hands according to Fig. 6.First the data of slab are split according to anchor-frame form, packing framing, and transmit frame by frame.After recipient receives Frame, guaranteeing under the correct continuous print prerequisite of data, replying confirmation signal.
Fig. 7 display be the hybrid network of a various wireless communication mode of building with the anti-interference adaptive wireless communications platform of multi tate of the present invention.Due to the working frequency range of Wifi, Zigbee, UHF tri-kinds of communication technologys, coded system, the otherness of host-host protocol, causes cannot carrying out data interaction and transmission between the node of use three kinds of wireless communication protocols.In mixed networks, such as adopt the node 2 of Wifi22 communication mode to want to transmit data to adopting the node 3 of Zigbee communication mode is cannot complete across frequency range, the transmission of cross-module formula.And the communications platform that have employed various wireless communication pattern can realize bridge joint effect, under the Analysis of Policy Making of control unit 1, under being first switched to the communication pattern of wifi22, realize the mutual of data with node 2.Then to acquisition initial data extracted valid data with after analyzing, then under being switched to Zigbee23 communication pattern, data are sent.And then the building of the data interaction achieved under different communication modes and plurality of communication schemes hybrid network.
Claims (2)
1. the anti-interference adaptive wireless communications platform of multi tate, is characterized in that:
Comprise control unit 1, wireless transmission unit 2 and sensor unit 3 three part, control unit 1, primarily of on-site programmable gate array FPGA composition, is responsible for the judgement of communication pattern and the realization of switching and communication protocol; Wireless transmission unit 2 is made up of UHF wireless module 21, Wifi wireless module 22 and Zigbee wireless module 23, is responsible for the wirelessly transmitting data of platform; Sensor unit 3 is primarily of Temperature Humidity Sensor 31, and imageing sensor 32 and acceleration transducer 33 form, and is responsible for the environment around acquisition platform and image information;
Described control unit 1 is as the scheduling and controlling center of platform, and wireless transmission unit 2 is connected with control unit 1 by electric interfaces with sensor unit 3, as peripheral hardware, completes fixed function;
Described wireless transmission unit 2 is by UHF wireless module 21, Wifi wireless module 22 and Zigbee wireless module 23 form, and three wireless modules are connected with the FPGA of control unit 1 by integrated circuit (IC) bus IIC, synchronous serial Peripheral Interface SPI, general-purpose serial bus USB, asynchronous serial port interface RS232;
Described sensor unit 3 is primarily of humidity sensor 31, and imageing sensor 32 and GPS Global Positioning System Sensor Unit 33 form; After radio communication platform powers on, humidity sensor 31, imageing sensor 32 and global position system GPS transducer 33 complete initialization, wait for FPGA control signal; After control unit 1FPGA sends request the order of data by integrated circuit (IC) bus IIC, synchronous serial Peripheral Interface SPI, general-purpose serial bus USB, asynchronous serial port interface RS232 communication interface, transducer reads command adapted thereto, the humiture data of collection, geographic coordinate information are sent to the FPGA of control unit 1 by above-mentioned communication interface, corresponding data are kept in internal memory by FPGA;
Described FPGA switches selection Wireless Fidelity WiFi, short-distance wireless communication Zigbee, superfrequency UHF tri-kinds of communications, then the enable signal of wireless communication module is drawn high, by general Data Transport Protocol by Packet Generation to wireless transport module, wireless transport module by receive data pack buffer in the internal memory of this locality, then sent by wireless link, when data are sent, return data end of transmission signal is to FPGA; The transmission of digital signal is, by FPGA, the data that the control command selecting to launch or transducer obtain are passed to above-mentioned three kinds of wireless transport modules, and then wireless module is data cached, by modulation, data is launched by wireless channel.
2. utilize a decision-making technique for the anti-interference adaptive wireless communications platform of the multi tate described in claim 1, it is special
Levy and be to comprise the steps:
Step 1: whole radio communication platform power-up initializing parameter or enter resting state after setting up timed task;
Step 2: arrive when there being request of data or the arrival of timed task time, the FPGA internal logic of control unit 1 wakes up automatically, carries out the transmission of data task;
Step 3: control unit 1 completes wireless sensor data acquisition tasks;
Step 4: control unit 1 is before carrying out Wireless Data Transmission, and advanced Mobile state decision-making, selects optimized communication to complete switching;
Described dynamic decision and the optimized concrete determination methods of selection are:
Step 4.1: the first analysis and calculation of FPGA of control unit 1 and the transmission range of adjacent communication node, communication distance parameter is calculated by the geographical coordinate of acquisition self and communication node, the geographical coordinate of self is initiatively carried when external node transmission packet or instruction, the information containing neighbors geographical coordinate received is stored in local internal memory by radio communication platform, and described neighbors refers to the node only having single-hop transmission distance apart from this node;
Step 4.2: when the transmission range of radio communication platform and neighbors is greater than 1km, control unit 1 selects UHF21 communication, after enable for UHF21 wireless communication module, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.3: within the distance of communication distance at 100m ~ 1000m, and when the channel of 2.4Ghz does not exist interference, open the radio frequency amplifier of Zigbee23, enable select Zigbee23 communication after, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.4: if there is larger channel fading or artificial interference in 2.4Ghz frequency range, after the UHF21 communication of enable selection 433Mhz, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.5: if transmission range is within 100m, data transmission delay requires little, and data task amount is large, adopts Wifi22 to carry out transfer of data, Exit Decision-making deterministic process, starts communication data transfer;
Step 4.6: if do not require data delay, and channel disturbance is not serious, namely the radio band transmission data of 2.4Ghz are adopted, the error rates of data that neighbors receives is low, reply handshaking information that can be correct, adopt the Zigbee23 Wireless Data Transmission of low-power consumption, Exit Decision-making deterministic process, start communication data transfer;
Step 5: control unit 1 carries out the transmission of data after selecting communication mode by decision optimization in step 4, in addition communication protocol is for control command, the view data of short byte data and slab adopts different Handshake Protocols to carry out data interaction respectively: byte number is less than the packet of 64bytes, adopts and shakes hands for twice; Be greater than the view data of 64bytes, carry out Data Segmentation, every 64bytes is packaged into a Frame, then adopts and repeatedly shakes hands, send packet continuously; Step 6: control unit 1, after having carried out data transfer task, again arranges task timing, otherwise enters resting state.
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| CN107370550A (en) * | 2017-07-04 | 2017-11-21 | 浙江理工大学 | Towards the real-time WiFi speed self-adaption method based on channel statistical information |
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| CN111010682A (en) * | 2020-02-22 | 2020-04-14 | 南京凯奥思数据技术有限公司 | Method for transmitting wireless sensor data through ZigBee and WiFi |
| CN113630788A (en) * | 2020-07-15 | 2021-11-09 | 威海北洋电气集团股份有限公司 | Communication network multi-mode switching method and system |
| CN113630788B (en) * | 2020-07-15 | 2024-05-28 | 威海北洋电气集团股份有限公司 | Multi-mode switching method and system for communication network |
| CN111800556A (en) * | 2020-09-01 | 2020-10-20 | 江西科技学院 | Image communication device and control method thereof |
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