A local area network seamless roaming method and system suitable for indoor and outdoor scene switching

Abstract

The present application belongs to the field of wireless information transmission technology, and provides a local area network seamless roaming method and system suitable for indoor and outdoor scene switching. If the method is a roaming switching method for a mobile device moving from indoors to outdoors, it comprises: deploying a first transmission mode and an AP device indoors, and deploying a second transmission mode and a gateway outdoors; when the mobile device moves, the AP device broadcasts in a first frequency band of the first transmission mode, listens to the response of the AP device, selects the AP with the optimal signal by judging the signal value, connects to the AP, and then transmits with the AP in a second frequency band of the first transmission mode; if the mobile device reaches an indoor and outdoor switching area, the gateway broadcasts in a first frequency band of the second transmission mode, listens to the response of the gateway, selects the gateway with the optimal signal by judging the signal value, connects to the gateway, and then transmits with the gateway in a second frequency band of the second transmission mode. The present application realizes seamless roaming switching, has lower roaming cost, and more stable transmission.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wireless information transmission, and particularly relates to a local area network seamless roaming method and system suitable for indoor and outdoor scene switching. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The wireless roaming schemes on the market at the present stage are roughly divided into two kinds, one is a base station-based mobile roaming technology, and the other is an indoor WIFI roaming technology, but both of the two schemes have limitations, for the mobile devices of indoor and outdoor switching operations in warehouses or ports, neither of the two schemes is suitable, one is that the base station roaming has poor flexibility, if the base station cannot be covered, a base station is separately added, the cost is high, and the corresponding speed of the base station roaming is low, the reliability is poor, and the risk of wide area network communication data stealing is high; the other is that the WIFI roaming of the local area network is only suitable for indoor use, the outdoor investment cost is too high, and the WIFI has weak anti-interference ability outdoors. SUMMARY

[0004] In order to solve the above problems, the present application provides a local area network seamless roaming method and system suitable for indoor and outdoor scene switching, the present application adopts WIFI and LORA roaming switching mode, first determines the device in a specific area through WIFI or LORA positioning, then performs pre-connection, and finally realizes seamless roaming switching, which is lower in cost than the base station roaming of the wide area network and more stable in transmission.

[0005] According to some embodiments, the present application adopts the following technical scheme:

[0006] In a first aspect, the present embodiment provides a local area network seamless roaming method suitable for indoor and outdoor scene switching.

[0007] A local area network seamless roaming method suitable for indoor and outdoor scene switching, the method is a roaming switching method of a mobile device moving from indoors to outdoors, comprising: deploying a first transmission mode and an AP device indoors, deploying a second transmission mode and a gateway outdoors, and a mobile device moving indoors and outdoors;

[0008] When the mobile device moves, the AP device of the first frequency band of the first transmission mode is broadcasted, the response of the AP device is listened to, the AP device with the optimal signal is selected through judging the signal value, and after connection, the second frequency band of the first transmission mode is used for transmission with the AP device;

[0009] If the mobile device reaches the indoor-outdoor switching area, the first frequency band broadcasting gateway using the second transmission mode listens to the response of the gateway, selects the gateway with the optimal signal by judging the signal value, connects after connection, and transmits with the gateway using the second frequency band of the second transmission mode.

[0010] Further, when the mobile device does not move, the second frequency band using the second transmission mode transmits with other devices.

[0011] Further, the first transmission mode is WIFI or Bluetooth.

[0012] Further, the second transmission mode is LORA.

[0013] Further, the first frequency band of the first transmission mode is a 5GHz WIFI frequency band, the second frequency band of the first transmission mode is a 2.4GHz WIFI frequency band, the first frequency band of the second transmission mode is a 510MHz LORA frequency band, and the second frequency band of the second transmission mode is a 470MHz LORA frequency band.

[0014] Further, the mobile device reaches the indoor-outdoor switching area through the first transmission mode.

[0015] In a second aspect, the embodiment provides a local area network seamless roaming system suitable for indoor-outdoor scene switching.

[0016] A local area network seamless roaming system suitable for indoor-outdoor scene switching, the system is a roaming switching system for a mobile device moving from indoors to outdoors, and is applied to a mobile terminal moving indoors and outdoors, comprising: deploying a first transmission mode and an AP device indoors, and deploying a second transmission mode and a gateway outdoors;

[0017] When moving, the first frequency band broadcasting AP device using the first transmission mode listens to the response of the AP device, selects the AP with the optimal signal by judging the signal value, connects after connection, and transmits with the AP device using the second frequency band of the first transmission mode.

[0018] When reaching the indoor-outdoor switching area, the first frequency band broadcasting gateway using the second transmission mode listens to the response of the gateway, selects the gateway with the optimal signal by judging the signal value, connects after connection, and transmits with the gateway using the second frequency band of the second transmission mode.

[0019] In a third aspect, the embodiment provides a local area network seamless roaming method suitable for indoor-outdoor scene switching.

[0020] The application discloses a local area network seamless roaming method suitable for indoor and outdoor scene switching.

[0021] When the mobile device moves, the gateway of a first frequency band in a second transmission mode is broadcasted, the response of the gateway is listened to, the gateway with the optimal signal is selected by judging the signal value, and after connection, the second frequency band in the second transmission mode is used for transmission with the gateway.

[0022] If the mobile device reaches the indoor and outdoor switching area, the AP device of a first frequency band in a first transmission mode is broadcasted, the response of the AP device is listened to, the AP device with the optimal signal is selected by judging the signal value, and after connection, the second frequency band in the first transmission mode is used for transmission with the AP device.

[0023] In a fourth aspect, the application provides a local area network seamless roaming system suitable for indoor and outdoor scene switching.

[0024] The application discloses a local area network seamless roaming system suitable for indoor and outdoor scene switching.

[0025] When the mobile device moves, the gateway of a first frequency band in a second transmission mode is broadcasted, the response of the gateway is listened to, the gateway with the optimal signal is selected by judging the signal value, and after connection, the second frequency band in the second transmission mode is used for transmission with the gateway.

[0026] When the mobile device reaches the indoor and outdoor switching area, the AP device of a first frequency band in a first transmission mode is broadcasted, the response of the AP device is listened to, the AP device with the optimal signal is selected by judging the signal value, and after connection, the second frequency band in the first transmission mode is used for transmission with the AP device.

[0027] Compared with the prior art, the application has the following beneficial effects:

[0028] 1. The application adopts WIFI and LORA roaming switching modes, first determines that a device is in a specific area through WIFI or LORA positioning, then performs pre-connection, and finally realizes seamless roaming switching.

[0029] 2. In the application, the LORA adopts a double-frequency pre-linking enhanced roaming scheme, one frequency band is used for data transmission, and one frequency band is used for pre-linking of a next gateway, and seamless switching is realized.

[0030] 3. The WIFI positioning and LORA positioning are adopted, the switching of the transmission mode in the specified area of the equipment is realized, and the AP and gateway equipment are more flexible to arrange.

[0031] 4. The whole roaming combination method, WIFI+LORA or Bluetooth+LORA, is disclosed, two unrelated transmission modes are combined through software and hardware, a reasonable switching mode is matched, the seamless roaming of indoor and outdoor mobile equipment is realized, the whole method has wide application scenarios, and can provide roaming services for indoor and outdoor mobile equipment. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.

[0033] Figure 1 is an application framework diagram of the local area network seamless roaming method suitable for indoor and outdoor scene switching according to the present application;

[0034] Fig. 2(a) is a first step schematic diagram of the mobile equipment roaming from indoor to outdoor according to the embodiment one of the present application;

[0035] Fig. 2(b) is a second step schematic diagram of the mobile equipment roaming from indoor to outdoor according to the embodiment one of the present application;

[0036] Fig. 2(c) is a third step schematic diagram of the mobile equipment roaming from indoor to outdoor according to the embodiment one of the present application;

[0037] Fig. 3(a) is a first step schematic diagram of the mobile equipment roaming from outdoor to indoor according to the embodiment two of the present application;

[0038] Fig. 3(b) is a second step schematic diagram of the mobile equipment roaming from outdoor to indoor according to the embodiment two of the present application;

[0039] Fig. 3(c) is a third step schematic diagram of the mobile equipment roaming from outdoor to indoor according to the embodiment two of the present application;

[0040] Figure 4 is a flow chart of the local area network seamless roaming method suitable for indoor and outdoor scene switching according to the embodiment one of the present application;

[0041] Figure 5 is a flow chart of the local area network seamless roaming method suitable for indoor and outdoor scene switching according to the embodiment two of the present application. DETAILED DESCRIPTION

[0042] The present application is further described below in combination with the drawings and embodiments.

[0043] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0044] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component, and / or combinations thereof.

[0045] In the present application, the terms such as "connected", "connected" and the like should be understood broadly, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant researchers or technicians in the art, the specific meaning of the above terms in the present application can be determined according to the specific circumstances, and it cannot be understood as a limitation on the present application.

[0046] For the problem of uninterrupted data transmission of mobile devices (AGV trolley, etc.) from indoor to outdoor or from outdoor to indoor, the existing solutions and disadvantages are as follows: one solution is to lay a large number of WIFI AP solutions to cover all indoor and outdoor areas, but the cost is high, and the WIFI signal has weak anti-interference ability in outdoor, and a large number of WIFI will cause serious frequency band interference; another solution is wide area network base station roaming, which is slow and cannot cover all scenarios, and data security cannot be guaranteed.

[0047] Therefore, the present application provides a low-cost and high-reliability wireless local area network roaming method and system suitable for indoor and outdoor switching scenarios, which solves the problem of uninterrupted data transmission of mobile devices (AGV trolley, etc.) from indoor to outdoor or from outdoor to indoor. As shown in Figure 1 The method is to combine WIFI and LORA transmission modes to lay a local area network, WIFI roaming indoors and LORA roaming outdoors. The key point of the present application is how to realize seamless roaming with the whole method, the WIFI and LORA roaming switching mode, the pre-connection method at each switching, etc. The following is a specific implementation scheme.

[0048] Embodiment one

[0049] The present embodiment provides a local area network seamless roaming method suitable for indoor and outdoor scene switching, which is a roaming switching method for mobile devices moving from indoor to outdoor.

[0050] Figures 2(a)-2(c)For mobile device from indoor to outdoor roaming sequence, Figure 4 The flow chart of the local area network seamless roaming method suitable for indoor and outdoor scene switching shown in the embodiment is as shown in Figures 2(a)-2(c) And Figure 4 As shown in the figure, the mobile device from indoor to outdoor roaming switching method is as follows:

[0051] STP1: When the device is stable transmission or not moving, the data is stably transmitted by using 2.4GHz WIFI frequency band;

[0052] STP2: When the device is moving, the device will broadcast the nearby AP device by using 5GHz WIFI frequency band to start pre-connection, select the AP with the optimal signal by judging the signal value, and connect to the AP after the 5GHz is connected to the AP and stable, and then use 2.4GHz to connect the AP to realize seamless switching;

[0053] STP3: After connecting to the new AP, the data is stably transmitted by using 2.4GHz WIFI frequency band;

[0054] STP4: The device reaches the indoor and outdoor switching area by WIFI positioning;

[0055] STP5: Start LORA pre-connection frequency band 510MHz broadcast, start LORA pre-connection, listen to the reply of the nearby LORA gateway, select the LORA gateway with the optimal signal by judging the signal value, and then connect to the gateway by using the data communication frequency band 470MHz to realize fast connection and seamless roaming;

[0056] STP6: After connecting to the new LORA gateway, the data is stably transmitted by using the data communication frequency band 470MHz;

[0057] STP7: When the device is moving, the device will broadcast the nearby LORA gateway device by using LORA pre-connection frequency band 510MHz, start pre-connection, select the gateway with the optimal signal by judging the signal value, and then connect to the gateway by using the data communication frequency band 470MHz after the pre-connection frequency band 510MHz is connected to the gateway and stable to realize seamless switching;

[0058] STP8: After connecting to the new LORA gateway, the data is stably transmitted by using the data communication frequency band 470MHz;

[0059] STP9: Repeat the steps of STP7-STP8.

[0060] Embodiment two

[0061] The embodiment provides a local area network seamless roaming system suitable for indoor and outdoor scene switching, the system is a roaming switching system for mobile equipment moving from indoors to outdoors, is applied to a mobile terminal moving indoors and outdoors, and comprises the following steps: deploying WIFI and AP equipment indoors and deploying LORA and a gateway outdoors.

[0062] When stable transmission or non-movement occurs, data is stably transmitted in a 2.4GHz WIFI frequency band;

[0063] When movement occurs, a 5GHz WIFI frequency band is used to broadcast nearby AP equipment, pre-connection is started, an AP with optimal signal is selected by judging a signal value, after the 5GHz is connected to the AP and is stable, 2.4GHz is used to connect the AP to realize seamless switching;

[0064] After being connected to the new AP, 2.4GHz WIFI frequency band is used for stable transmission;

[0065] According to WIFI positioning judgment, when reaching an indoor and outdoor switching area, a LORA pre-connection frequency band 510MHz is started to broadcast, LORA pre-connection is started, a reply of a nearby LORA gateway is listened to, a LORA gateway with optimal signal is selected by judging a signal value, and then the gateway is connected through a data communication frequency band 470MHz to realize fast connection and seamless roaming;

[0066] After being connected to the new LORA gateway, the data communication frequency band 470MHz is used for stable transmission;

[0067] When movement occurs, a LORA pre-connection frequency band 510MHz is used to broadcast nearby LORA gateway equipment, pre-connection is started, a gateway with optimal signal is selected by judging a signal value, after the LORA pre-connection frequency band 510MHz is connected to the gateway and is stable, the gateway is connected through the data communication frequency band 470MHz to realize seamless switching;

[0068] After being connected to the new LORA gateway, the data communication frequency band 470MHz is used for stable transmission.

[0069] Embodiment three

[0070] The embodiment provides a local area network seamless roaming method suitable for indoor and outdoor scene switching, and the method is a roaming switching method for mobile equipment moving from outdoors to indoors.

[0071] Figures 3(a)-3(c) The roaming sequence of the mobile equipment from outdoors to indoors is as follows, Figure 5 A flow chart of the local area network seamless roaming method suitable for indoor and outdoor scene switching is shown in Figures 3(a)-3(c) and Figure 5 The roaming switching method of the mobile equipment from outdoors to indoors is as follows,

[0072] STP1: When the device is stable transmission or not moving, the data is transmitted stably in the LORA data communication frequency band 470MHz frequency band;

[0073] STP2: When the device is moving, the device will broadcast the nearby LORA gateway device using the LORA pre-connection frequency band 510MHz to start pre-connection, select the gateway connection with the optimal signal by judging the signal value, and after the pre-connection frequency band 510MHz is connected to the gateway and stabilized, connect the gateway using the data communication frequency band 470MHz to realize seamless switching;

[0074] STP3: After connecting to the new LORA gateway, the data is transmitted stably in the data communication frequency band 470MHz;

[0075] STP4: Determine the device to reach the indoor-outdoor switching area through LORA positioning;

[0076] STP5: Start broadcasting in the WIFI 5GHz frequency band, start WIFI pre-connection, listen to the reply of the nearby AP, select the AP connection with the optimal signal by judging the signal value, and then connect to the gateway through the WIFI 2.4GHz to realize fast connection and seamless roaming;

[0077] STP6: After connecting to the new AP, the data is transmitted stably in the 2.4GHz WIFI frequency band;

[0078] STP7: When the device is moving, the device will broadcast the nearby AP device using the 5GHz WIFI frequency band to start pre-connection, select the AP connection with the optimal signal by judging the signal value, and after the 5GHz is connected to the AP and stabilized, connect the AP using the 2.4GHz to realize seamless switching;

[0079] STP8: After connecting to the new AP, the data is transmitted stably in the 2.4GHz WIFI frequency band;

[0080] STP9: Repeat the steps of STP7-STP8.

[0081] Example Four

[0082] The embodiment provides a local area network seamless roaming system suitable for indoor and outdoor scene switching.

[0083] A local area network seamless roaming system suitable for indoor and outdoor scene switching, the system is a roaming switching system for a mobile device moving from outdoor to indoor, and is applied to a mobile terminal moving indoors and outdoors, and comprises a first transmission mode and an AP device arranged indoors, and a second transmission mode and a gateway arranged outdoors.

[0084] When the device is stable transmission or not moving, the data is transmitted stably in the LORA data communication frequency band 470MHz frequency band;

[0085] When moving, the LORA pre-connection frequency band 510MHz is used to broadcast the nearby LORA gateway device, pre-connection is started, the signal value is judged, the gateway connection with the optimal signal is selected, after the pre-connection frequency band 510MHz is connected to the gateway and is stable, the data communication frequency band 470MHz is used to connect the gateway to realize seamless switching;

[0086] After being connected to the new LORA gateway, the data communication frequency band 470MHz is used for stable transmission;

[0087] According to the LORA positioning judgment, when reaching the indoor-outdoor switching area, the WIFI 5GHz frequency band broadcast is started, WIFI pre-connection is started, the reply of the nearby AP is listened to, the signal value is judged, the AP connection with the optimal signal is selected, and then the WIFI 2.4GHz is connected to the gateway to realize fast connection and seamless roaming;

[0088] After being connected to the new AP, the 2.4GHz WIFI frequency band is used for stable transmission;

[0089] When moving, the 5GHz WIFI frequency band is used to broadcast the nearby AP device, pre-connection is started, the signal value is judged, the AP connection with the optimal signal is selected, after 5GHz is connected to the AP and is stable, the 2.4GHz is used to connect the AP to realize seamless switching;

[0090] After being connected to the new AP, the 2.4GHz WIFI frequency band is used for stable transmission.

[0091] The above only describes the preferred embodiments of the present application and is not used to limit the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for seamless roaming on a local area network suitable for switching between indoor and outdoor scenes, characterized in that, The method is a roaming handover method for mobile devices moving from indoors to outdoors, including: deploying a first transmission method and an AP device indoors, deploying a second transmission method and a gateway outdoors, and the mobile device moving between indoors and outdoors; When the mobile device moves, it broadcasts the AP device using the first frequency band of the first transmission method, listens for the AP device's response, and selects the AP device with the best signal to connect by judging the signal value. After connection, it transmits with the AP device using the second frequency band of the first transmission method. If the mobile device reaches the indoor / outdoor switching area, it broadcasts to the gateway using the first frequency band of the second transmission method, listens for the gateway's response, judges the signal value, selects the gateway with the best signal to connect to, and then transmits with the gateway using the second frequency band of the second transmission method. The first transmission method is WIFI, the first frequency band of the first transmission method is the 5GHz WIFI band, and the second frequency band of the first transmission method is the 2.4GHz WIFI band; the second transmission method is LORA, the first frequency band of the second transmission method is the 510MHz LORA band, and the second frequency band of the second transmission method is the 470MHz LORA band. When the mobile device is stationary, it uses the second frequency band of the first transmission method to transmit with other devices. The mobile device is located upon reaching the indoor / outdoor switching area via a first transmission method; The system adopts a WIFI and LoRa roaming switching method. First, it uses WIFI or LoRa positioning to determine that the device is in a specific area, then pre-connects, and finally achieves seamless roaming switching. LORA employs a dual-band pre-linked enhanced roaming scheme, with one band transmitting data and the other band pre-linking the next gateway, achieving seamless handover.

2. A seamless roaming system for local area networks suitable for switching between indoor and outdoor scenes, characterized in that, The system is a roaming switching system for mobile devices moving from indoors to outdoors, applied to mobile terminals moving indoors and outdoors, including: deploying a first transmission method and AP device indoors, and deploying a second transmission method and gateway outdoors; When moving, the AP device is broadcast using the first frequency band of the first transmission method, and the response of the AP device is listened to. By judging the signal value, the AP with the best signal is selected for connection. After connection, the AP device is transmitted using the second frequency band of the first transmission method. When the indoor / outdoor switching area is reached, the first frequency band of the second transmission method is used to broadcast to the gateway, listen to the gateway's response, and select the gateway with the best signal by judging the signal value. After connection, the second frequency band of the second transmission method is used to transmit with the gateway. The first transmission method is WIFI, the first frequency band of the first transmission method is the 5GHz WIFI band, and the second frequency band of the first transmission method is the 2.4GHz WIFI band; the second transmission method is LORA, the first frequency band of the second transmission method is the 510MHz LORA band, and the second frequency band of the second transmission method is the 470MHz LORA band. When the mobile device is stationary, it uses the second frequency band of the first transmission method to transmit with other devices. The mobile device is located upon reaching the indoor / outdoor switching area via a first transmission method; The system adopts a WIFI and LoRa roaming switching method. First, it uses WIFI or LoRa positioning to determine that the device is in a specific area, then pre-connects, and finally achieves seamless roaming switching. LORA employs a dual-band pre-linked enhanced roaming scheme, with one band transmitting data and the other band pre-linking the next gateway, achieving seamless handover.

3. A method for seamless roaming on a local area network suitable for switching between indoor and outdoor scenes, characterized in that, The method is a roaming handover method for mobile devices moving from outdoors to indoors, including: deploying a first transmission method and an AP device indoors, deploying a second transmission method and a gateway outdoors, and a mobile device moving between indoors and outdoors; When the mobile device moves, it broadcasts to the gateway on the first frequency band using the second transmission method, listens for the gateway's response, and selects the gateway with the best signal by judging the signal value. After connection, it transmits with the gateway using the second frequency band of the second transmission method. If the mobile device reaches the indoor / outdoor switching area, the first frequency band of the first transmission method is used to broadcast to the AP device, listen to the AP device's response, and select the AP device with the best signal to connect by judging the signal value. After connection, the second frequency band of the first transmission method is used to transmit with the AP device. The first transmission method is WIFI, the first frequency band of the first transmission method is the 5GHz WIFI band, and the second frequency band of the first transmission method is the 2.4GHz WIFI band; the second transmission method is LORA, the first frequency band of the second transmission method is the 510MHz LORA band, and the second frequency band of the second transmission method is the 470MHz LORA band. When the mobile device is stationary, it uses the second frequency band of the second transmission method to transmit with other devices. The mobile device is located upon reaching the indoor / outdoor switching area via a second transmission method; The system adopts a WIFI and LoRa roaming switching method. First, it uses WIFI or LoRa positioning to determine that the device is in a specific area, then pre-connects, and finally achieves seamless roaming switching. LORA employs a dual-band pre-linked enhanced roaming scheme, with one band transmitting data and the other band pre-linking the next gateway, achieving seamless handover.

4. A seamless roaming system for local area networks suitable for switching between indoor and outdoor scenes, characterized in that, The system is a roaming switching system for mobile devices moving from outdoors to indoors, applied to mobile terminals moving between indoors and outdoors, including: deploying a first transmission method and AP device indoors, and deploying a second transmission method and gateway outdoors; When moving, the first frequency band broadcasts to the gateway using the second transmission method, listens for the gateway's response, judges the signal value, selects the gateway with the best signal to connect to, and then transmits with the gateway using the second frequency band of the second transmission method. When arriving at the indoor / outdoor switching area, the AP device is broadcast on the first frequency band using the first transmission method. The response from the AP device is monitored. By judging the signal value, the AP device with the best signal is selected for connection. After connection, the second frequency band of the first transmission method is used to transmit with the AP device. The first transmission method is WIFI, the first frequency band of the first transmission method is the 5GHz WIFI band, and the second frequency band of the first transmission method is the 2.4GHz WIFI band; the second transmission method is LORA, the first frequency band of the second transmission method is the 510MHz LORA band, and the second frequency band of the second transmission method is the 470MHz LORA band. When the mobile device is stationary, it uses the second frequency band of the second transmission method to transmit with other devices. The mobile device is located upon reaching the indoor / outdoor switching area via a second transmission method; The system adopts a WIFI and LoRa roaming switching method. First, it uses WIFI or LoRa positioning to determine that the device is in a specific area, then pre-connects, and finally achieves seamless roaming switching. LORA employs a dual-band pre-linked enhanced roaming scheme, with one band transmitting data and the other band pre-linking the next gateway, achieving seamless handover.

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