CN108124317A - A kind of bimodulus single-antenna wireless group network system of embedded gateway - Google Patents
A kind of bimodulus single-antenna wireless group network system of embedded gateway Download PDFInfo
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- CN108124317A CN108124317A CN201711459813.7A CN201711459813A CN108124317A CN 108124317 A CN108124317 A CN 108124317A CN 201711459813 A CN201711459813 A CN 201711459813A CN 108124317 A CN108124317 A CN 108124317A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention provides a kind of bimodulus single-antenna wireless group network systems of embedded gateway, are related to wireless telecommunications system field.Wherein, including at least one embedded relay and at least one embedded end-point devices, the embedded end-point devices include the first pcb board and endpoint unit, and the endpoint unit includes endpoint MCU and the first LORA modem；The embedded relay includes the second pcb board and relay unit, and the relay unit includes combiner, NB IoT modules and the 2nd LORA modem；It is NB signals by the LORA signals sent after the aspect conversion of the NB IoT modules, the NB IoT modules can send the NB signals to the combiner, and the combiner is exported after combining the NB signals and the LORA signals by second antenna.A kind of bimodulus single-antenna wireless group network system of embedded gateway of the present invention is simple in structure and low-power consumption, can be compatible with LORA and NB IoT modules using single MCU, overall structure miniaturization can be embedded in inside equipment.
Description
Technical field
The present invention relates to wireless telecommunications system technical field, in particular to a kind of bimodulus Dan Tian of embedded gateway
Line wireless networking system.
Background technology
At present the wireless data monitorings industries such as traditional sensor monitoring, radio meter register, unmanned counter (as municipal administration, environmental sanitation,
The industries such as agricultural irrigation, wisdom block, intelligence wearing), usually using various wireless networking modes；And in this high speed of Internet of Things
The age of development, the demand of wireless device networking are even more to be broken out in blowout.Networking difficulty and networking load are also increasingly heavier.
Traditional networking mode, in certain area coverage carry out constructing local network (such as wifi, zigbee, bluetooth,
LORA, 433Mhz), then several data concentrators of arrangement or intelligent gateway in place, intelligent gateway use again
The communication modes such as GPRS or 3G/4G are connected with platform, carry out data and mutually pass and monitor.This networking mode, it is necessary to one or
Several high costs, big power consumption, the intelligent gateway being individually laid out.Using the platforms communication modes such as GPRS or 3G/4G, again
Increase and outer antenna；And increasing with area's intradomain gateway number, base station also increasingly can't bear the heavy load.So with Internet of Things
Networking equipment develops towards smallerization, explosion type equipment amount, low-power consumption, small data quantity demand direction, traditional wireless networking
Mode will not apply to increasingly and cause cost waste and load down phenomenon.Then it is proposed that a kind of pair of embedded gateway
Mould single-antenna wireless group network system solves this Internet of Things industry wireless networking pain spot.
The content of the invention
The present invention provides the insertions that a kind of simple in structure, low-power consumption, single MCU can be compatible with LORA and NB-IoT modules
The bimodulus single-antenna wireless group network system of formula gateway, it is intended to improve increasing due to gateway number, cause load of base station excessive and whole
The technical issues of body power consumption is big.
What the present invention was realized in：
The bimodulus single-antenna wireless group network system of a kind of embedded gateway, including at least one embedded relay and extremely
Few embedded end-point devices；Each embedded end-point devices include the first pcb board and endpoint unit, the endpoint list
Member includes the endpoint MCU and the first LORA modem of circuit connection, and the first LORA modem are received by first antenna
LORA signals, and under the control of the endpoint MCU LORA signals are sent to the embedded relay；It is each described
Embedded relay includes the second pcb board and relay unit, and the relay unit includes combiner, NB-IoT modules and second
LORA modem；The 2nd LORA modem receive the LORA signals of the first antenna transmission by the second antenna,
And the LORA signals are sent to the NB-IoT modules and the combiner under the control of the NB-IoT modules；Definition is logical
It is NB signals to cross the LORA signals that send after the aspect conversion of the NB-IoT modules, and the NB-IoT modules can be to described
Combiner sends the NB signals, and the combiner passes through described second day after combining the NB signals and the LORA signals
Line exports.
As a further improvement, the NB-IoT modules include main control MCU and NB-IoT transceivers, the main control MCU is used
The LORA signals are sent to the NB-IoT transceivers and the combiner in control the 2nd LORA modem, it is described
NB-IoT transceivers send the NB signals to the combiner and receive the LORA signals.
As a further improvement, the main control MCU includes main control chip, the main control MCU is further with described second
LORA modem chip circuits connection in LORA modem；The main control MCU for control the LORA modem chips into
The reception of the row LORA signals and the control LORA modem chips realize the 2nd LORA modem to the conjunction
Road device sends the LORA signals.
As a further improvement, the main control chip can be Hi2110 or MT2625 or RD8909 or MDM9206；It is described
LORA modem chips can be SX1276 or SX1278.
It is decorated as a further improvement, each embedded relay corresponds at least one embedded end of reception
The signal data put.
As a further improvement, the NB signals and the LORA signals are sent respectively to NB-IoT base stations by the antenna
With LORA base stations.
As a further improvement, first pcb board is single sided board, second pcb board is dual platen.
As a further improvement, it is respectively arranged with two dimension in the embedded relay and the embedded end-point devices
Code and respective ID can carry out P2P configurations by cell phone application barcode scanning or remote platform.
As a further improvement, the NB-IoT modules and the 2nd LORA modem can also directly pass through described
Ttl serial ports on two pcb boards is connected with computer, to realize the backup of the NB signals and the LORA signals.
As a further improvement, the band limits of the antenna is 433~960Mhz.
The beneficial effects of the invention are as follows：
1. a kind of bimodulus single-antenna wireless group network system of embedded gateway of the present invention integrally uses unique LORA from group
The combination of net and NB-IoT wide area networks by first building LAN with LORA, avoids each equipment from being connected directly to base
It stands, then with NB-IoT network connections to NB-IoT base stations, reduces wide area network base station load；It is whole from LAN to wide area network simultaneously
Using the lowest power consumptions agreement such as LORA+NB-IoT, abandoning tradition networking mode, can be straight using the extra small structure of embedded equipment
It connects to be embedded into and want inside networked devices, without in addition arranging gateway, the low-consumption wireless networking for removing gateway is realized, in being greatly reduced
After the cost and power consumption of gateway, it is particularly suitable for the wireless networking application of Internet of Things small data quantity.
2. the NB-IoT modules in a kind of bimodulus single-antenna wireless group network system of embedded gateway of the present invention are using existing
NB-IoT chips, LORA modem chips, then the addition for passing through simple software are connected on the basis of this main control MCU so that
Main control MCU come control LORA modem chips realize LORA signals transmitting-receiving, this save LORA modem chips originally need
The control MCU wanted reduces device cost, and without repeating individually to remove power supply modules.
3. a kind of bimodulus single-antenna wireless group network system of embedded gateway of the present invention is designed using combiner, can be by difference
The signal composition of frequency range together afterwards by single antenna receiving and transmitting signal, can common antenna, the double antenna installation of abandoning tradition, significantly
Lower equipment cost.
4. a kind of bimodulus single-antenna wireless group network system overall power of embedded gateway of the present invention is low, set using univoltage
Meter can use battery powered, reduce cost and be more suitable for industry or the inconvenient occasion of power supply.
5. a kind of bimodulus single-antenna wireless group network system of embedded gateway of the present invention is integrally comprising NB-IoT modules, second
The combination of LORA modem, endpoint MCU, the first tetra- parts of LORA modem, can freely convert endpoint and Tandem Gateway, can make
It uses, and can be used as gateway relay for networking endpoint, accomplish super-small, the arbitrary free nothing of insertion is realized in low-power consumption
The purpose of line networking.
Description of the drawings
It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to scope, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of structure diagram of the bimodulus single-antenna wireless group network system of embedded gateway of the present invention；
Fig. 2 is a kind of systematic schematic diagram of the bimodulus single-antenna wireless group network system of embedded gateway of the present invention.
Main element symbol description
Embedded end-point devices 10
First pcb board 11
Endpoint unit 12
Endpoint MCU 121
First LORA modem 122
Embedded relay 20
Second pcb board 21
Relay unit 22
NB-IoT modules 221
Main control MCU 2211
NB-IoT transceivers 2212
2nd LORA modem 222
Combiner 223
First antenna 30
Second antenna 40
NB-IoT base stations x
LORA base stations y
Specific embodiment
To make the purpose, technical scheme and advantage of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is the embodiment of a part of embodiment of the present invention rather than whole.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained without creative efforts, belongs to the present invention
The scope of protection.Therefore, below the detailed description of the embodiments of the present invention to providing in the accompanying drawings be not intended to limit will
The scope of the present invention of protection is sought, but is merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained without creative efforts belongs to this
Invent the scope of protection.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as pin ", " counterclockwise " are based on orientation shown in the drawings or position relationship, are for only for ease of
The description present invention and simplified description rather than instruction imply that signified equipment or element must be with specific orientation, Yi Te
Fixed azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, " multiple " are meant that two or more,
Unless otherwise specifically defined.
It please refers to Fig.1 to Fig. 2, in embodiment, a kind of bimodulus single-antenna wireless group network system of embedded gateway, specifically
, including at least one embedded relay 20, at least one embedded end-point devices 10,30 and second antenna of first antenna
40, each embedded relay 20 and each embedded end-point devices 10 are correspondingly arranged in one and need what is networked
In equipment；The embedded relay 20 and the embedded end-point devices 10 pass through wireless connection, distance between the two
Up to 1~2 km.
Each embedded end-point devices 10 include the first pcb board 11 and endpoint unit 12, and the endpoint unit 12 wraps
The endpoint MCU121 and the first LORA modem122 of circuit connection are included, the first LORA modem122 pass through first antenna 30
LORA signals are received, and sends the LORA to the embedded relay 20 under the control of the endpoint MCU121 and believes
Number.The endpoint MCU121 can be common microcontroller.
Each embedded relay 20 includes the second pcb board 21 and relay unit 22, and the relay unit 22 wraps
Include combiner 223,221 and the 2nd LORA modem222 of NB-IoT modules of equal circuit connection between any two；2nd LORA
Modem222 receives the LORA signals of the transmission of first antenna 30 by the second antenna 40, and in the NB-IoT modules
Under 221 control the LORA signals are sent to the NB-IoT modules 221 and the combiner 223；Definition passes through the NB-
The LORA signals sent after the aspect conversion of IoT modules 221 are NB signals, and the NB-IoT modules 221 can be to the conjunction
Road device 223 sends the NB signals, the combiner 223 the NB signals and the LORA signals are combined after by described the
Two antennas 40 export.It is designed using combiner 223, after being embedded into user equipment inside, it is only necessary to which pulling out an antenna can incite somebody to action
The signal composition of different frequency range sends signal by single antenna afterwards together, and the double antenna installation of abandoning tradition is lowered and set significantly
Standby cost.
The whole combination using unique LORA ad hoc network and NB-IoT wide area networks, by first building local with LORA
Net avoids each equipment from being connected directly to base station, then with NB-IoT network connections to NB-IoT base stations x, reduces wide area network base
It stands load；Simultaneously all using the lowest power consumptions agreement such as LORA+NB-IoT, abandoning tradition networking side from LAN to wide area network
Formula using the extra small structure of embedded equipment, can be directly embedded into and want inside networked devices, without in addition arranging gateway, realize
The low-consumption wireless networking of gateway is gone, the cost and power consumption of Tandem Gateway is greatly reduced, is particularly suitable for Internet of Things small data quantity
Wireless networking application.
It please refers to Fig.2, in embodiment, the NB-IoT modules 221 include main control MCU 2211 and NB-IoT transceivers
2212, the main control MCU 2211 is for controlling the 2nd LORA modem222 to NB-IoT transceivers 2212 and described
Combiner 223 sends the LORA signals, the NB-IoT transceivers 2212 to the combiner 223 send the NB signals and
Receive the LORA signals.
Further, the main control MCU 2211 include main control chip, the main control MCU further with the 2nd LORA
LORA modem chip circuits connection in modem；The main control chip is used to that the LORA modem chips to be controlled to carry out institute
The reception and the control LORA modem chips for stating LORA signals realize the 2nd LORA modem222 to the conjunction
Road device 223 sends the LORA signals.
Specifically, the main control chip can be Hi2110 or MT2625 or RD8909 or MDM9206；The LORA modem
Chip can be SX1276 or SX1278.
The NB-IoT modules 221 use existing NB-IoT chips, and LORA is connected on the basis of this main control MCU 2211
Modem chips, then the addition for passing through simple software so that main control MCU 2211 come control LORA modem chips realize LORA letter
Number transmitting-receiving, this save the control MCU that LORA modem chips need originally, reduce device cost, and without repeating
Individually remove power supply modules.
Please refer to Fig.1 to Fig. 2, in embodiment, each embedded relay 20 correspond to receive it is at least one described
The signal data of embedded end-point devices 10, specifically, because being limited by distance and region, an embedded relay 20
Possibly all embedded end-point devices 10 can not be covered, at this point, multiple embedded relays 20 are then needed, and it is different
Embedded relay 20 can by the ID of each embedded end-point devices 10 and with they the distance between avoid repeating
The LORA signals that identical embedded end-point devices 10 are sent are received, for example, embedded in the center of one km of radius placement one
Relay 20, with respective ID, embedded relay 20 can only connect the embedded end-point devices 10 in radius
Receive the signal data of the correspondence ID in radius.By first building LAN with LORA, each equipment is avoided to be directly connected to
To base station, then with NB-IoT network connections to NB-IoT base stations x, the connection number of current 2G/3G/4G base stations and negative is greatly reduced
It carries, the connection number and coverage of NB-IoT base stations x are significantly larger than tradition 2G/3G/4G base stations.
It please refers to Fig.1, in embodiment, the NB signals and the LORA signals are sent respectively to NB-IoT by the antenna
Base station x and LORA base station y；The NB signals are NB-IoT signals.
It please referring to Fig.1, in embodiment, first pcb board 11 is single sided board, and second pcb board 21 is dual platen, because
For embedded relay 20 two chips of NB-IoT chips and LORA modem are contained, it is necessary to which dual platen increases placement-face
Product, the size on the projecting direction of plank can reduce at this time, to realize the miniaturization of structure.
Further, it is respectively arranged with Quick Response Code in the embedded relay 20 and the embedded end-point devices 10
With respective ID, can P2P configurations be carried out by cell phone application barcode scanning or remote platform, substitute screen, preferably realize integrally-built
Miniaturization.
It please refers to Fig.1 to Fig. 2, the NB-IoT modules 221 and the 2nd LORA modem222 can also directly pass through
Tt l serial ports on first pcb board 11 is connected with computer, to realize the backup of the NB signals and the LORA signals, this
When, backup signal need not be by being not required antenna and combiner 223 that can realize.
The band limits of the antenna is 433~960Mhz, current country mainstream NB-IoT frequency ranges be Band5 (824~
849Mhz, 869~894Mhz), Band8 (880~915Mhz, 925~960Mhz)；LORA frequency ranges are 433,470 frequency ranges.Therefore it adopts
Merge this antenna with the combiner 223 comprising the i.e. 433~960Mhz of LORA and NB-IoT frequency ranges, reach the mesh of common antenna
, that is, few cost is saved, and facilitates installation.
Traditional gateway is mostly using the form of ready-made packaged communication module combination in the market, such as LORA modules+NB-
IoT modules 221 or LORA module+3G/4G modules etc., these virtually both increase hardware cost, dimensionally can also make
Gateway device is larger, poor in environmental signal, and easily interferes with each other.And the system overall power of the present invention is low,
Using the hardware device most simplified, all using the device of low-power consumption and LORA and NB-IoT agreements, designed using univoltage
It without powerful power module centainly be needed to be powered, can be directly powered by external connection battery, reduce cost and more
Suitable for industry or the inconvenient occasion of power supply.
In addition, the bimodulus single-antenna wireless group network system of the embedded gateway need to only be done simple on hardware device
Modification just can be used as the use of networking endpoint, and can be used as gateway relay；Such as：When this system is as wireless networking
Endpoint when, 221 and the 2nd LORA modem222 of NB-IoT modules can be saved, only use endpoint MCU121 and the first LORA
The transmitting-receiving control of LORA signals can be completed in modem122, the LORA signal datas of endpoint is obtained from end-point devices, utmostly
Optimize cost；Simultaneously compare traditional Tandem Gateway, this system as Tandem Gateway in use, additional LORA can be eliminated
MCU is controlled, shares 2211 part of main control MCU of NB-IoT modules 221.It, also can be single when use condition does not have NB-IoT base stations x
The LORA signals of endpoint are solely collected using the 2nd LORA modem222, concurrently serves and passes to LORA base stations y.
To sum up, the bimodulus single-antenna wireless group network system of this embedded gateway includes NB-IoT modules 221, the 2nd LORA
The combination of modem222, endpoint MCU121, the first tetra- parts of LORA modem122, can freely convert endpoint and trunk network
It closes, can be used as networking endpoint, and can be used as gateway relay, accomplish super-small, arbitrary insertion is realized in low-power consumption
The purpose of free wireless networking.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the invention, for this field
For technical staff, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made is any
Modification, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of bimodulus single-antenna wireless group network system of embedded gateway, it is characterised in that：Including it is at least one it is embedded in
After device and at least one embedded end-point devices；Each embedded end-point devices include the first pcb board and endpoint unit,
The endpoint unit includes the endpoint MCU and the first LORA modem of circuit connection, and the first LORA modem pass through first
Antenna receives LORA signals, and sends the LORA signals to the embedded relay under the control of the endpoint MCU；
Each embedded relay includes the second pcb board and relay unit, and the relay unit includes combiner, NB-IoT moulds
Block and the 2nd LORA modem；The 2nd LORA modem are received by the second antenna described in the first antenna transmission
LORA signals, and send the LORA to the NB-IoT modules and the combiner under the control of the NB-IoT modules and believe
Number；Definition is NB signals by the LORA signals sent after the conversion of the aspects of the NB-IoT modules, the NB-IoT moulds
Block can send the NB signals to the combiner, and the combiner passes through after combining the NB signals and the LORA signals
The second antenna output.
2. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：The NB-
IoT modules include main control MCU and NB-IoT transceivers, and the main control MCU is for controlling the 2nd LORA modem to described
NB-IoT transceivers and the combiner send the LORA signals, described in the NB-IoT transceivers are sent to the combiner
NB signals and the reception LORA signals.
3. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 2, it is characterised in that：The master control
MCU includes main control chip, and the main control MCU further connects with the LORA modem chip circuits in the 2nd LORA modem
It connects；The main control MCU is used for described in the reception that the LORA modem chips is controlled to carry out the LORA signals and control
LORA modem chips realize that the 2nd LORA modem send the LORA signals to the combiner.
4. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 3, it is characterised in that：The master control
Chip can be Hi2110 or MT2625 or RD8909 or MDM9206；The LORA modem chips can be SX1276 or SX1278.
5. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：It is each described
Embedded relay corresponds to the signal data for receiving at least one embedded end-point devices.
6. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：The antenna
The NB signals and the LORA signals are sent respectively to NB-IoT base stations and LORA base stations.
7. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：Described first
Pcb board is single sided board, and second pcb board is dual platen.
8. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：The insertion
Be respectively arranged with Quick Response Code and respective ID in formula relay and the embedded end-point devices, can by cell phone application barcode scanning or
Remote platform carries out P2P configurations.
9. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：The NB-
IoT modules and the 2nd LORA modem can also be directly connected by the ttl serial ports on second pcb board with computer,
To realize the backup of the NB signals and the LORA signals.
10. the bimodulus single-antenna wireless group network system of embedded gateway according to claim 1, it is characterised in that：The day
The band limits of line is 433~960Mhz.
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| CN108834111A (en) * | 2018-06-13 | 2018-11-16 | 浙江诺控通信技术有限公司 | A kind of dual-mode wireless communication terminal and method with ad hoc network |
| CN110335451A (en) * | 2019-06-11 | 2019-10-15 | 厦门骐俊物联科技股份有限公司 | Intelligent gas LoRaWAN gateway data acquisition device and method |
| CN111918307A (en) * | 2020-07-31 | 2020-11-10 | 重庆邮电大学 | Multilayer gateway data transmission system and method based on LoRa positioning |
| CN112615651A (en) * | 2020-12-11 | 2021-04-06 | 浙江大学 | Information transmission system and method for supervising entrance and exit of living places of floating population |
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