CN112615651A - Information transmission system and method for supervising entrance and exit of living places of floating population - Google Patents
Information transmission system and method for supervising entrance and exit of living places of floating population Download PDFInfo
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00563—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys using personal physical data of the operator, e.g. finger prints, retinal images, voicepatterns
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- 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
Abstract
The invention discloses an information transmission system and method for supervising entrance and exit of a living place of floating population. The system consists of an LoRa terminal set, an LoRa gateway, an NB-IoT terminal set, an NB-IoT base station and an information fusion processing platform. The information transmission system adopts a LoRa architecture blended into NB-IoT, meets the requirements of sporadic distribution and in-and-out supervision of a connected centralized living place, and reduces TCO of the system; an internal/external double antenna is designed according to the maintenance system LoRa complete system, so that the shielding effect of a metal door on LoRa signals is eliminated, and the reliability of the system is improved; an LC filter circuit of LoRa is improved by means of a surface acoustic wave filter, and a Bluetooth module ensures the legal power of opening/closing door authorization of a house property owner; according to the data of the entrance and the exit of the resident place of the lessee, the LoRa working mode is set according to the requirement of people, and the low power consumption and the real-time performance of the information transmission system are considered.
Description
Technical Field
The invention belongs to the information transmission category of the Internet of things. In particular to an information transmission system and an information transmission method for monitoring the entrance and exit of the floating population by merging NB-IoT, adopting an indoor/outdoor double antenna and setting an LoRa working mode by people.
Background
With the continuous promotion of the urbanization process in China, a large number of floating population is rushed into cities. In 2019, the permanent floating population of Shanghai, Guangzhou, Shenzhen, Beijing and Hangzhou are 972.69, 967.33, 818.11, 794.30 and 450.44 thousands of people respectively. The strategy of exploring the response of the urban floating population supervision subject forms a consensus by the management departments at all levels after years of practice: the door lock of the standing residential place supervises floating population, and takes the best of the objectives and the best of the affairs. The Internet of things comprises a sensing layer, a network layer and an application layer; by referring to the technical architecture of the internet of things, the technologies of an application layer and a sensing layer of the internet of things are completely mature or basically mature in consideration of the internet of things for monitoring the entrance and exit of the living places of the floating population. Even in terms of a network layer that performs information transfer and processing, the information processing portion thereof does not present a technical problem; the key problem is that the information transmission part of the network layer has no ideal solution so far, and the problem is urgently needed to be solved by creating an information transmission system serving for monitoring the entrance and exit of living places of floating population.
The floating population under the high room price and the government regulation and control hastening birth is just like a kaleidoscope and is varied in state, so that the floating population is blindly and gladly. Traditional narrow residence: the renting rooms of residents and farmers, the renting rooms operated by enterprises, and the group renting rooms on which two houses depend on media. On the basis of the traditional narrow-sense residence, the modern generalized residence develops a real estate agency house with property rights and operation separation as main characteristics, and long renting public houses of real estate bureaus and the like; government regulation also launches economically applicable houses, property-sharing houses, low-priced houses, blue-collar apartments, white-collar public houses, introduced talent houses, and built houses and self-contained houses derived from land tenders and bids (developers can only use for renting), and the like, which are dazzling in forest populations. The residences of the floating population can be classified into individuals, enterprises, governments or some combination of the three according to the property rights of the house; according to the geographical distribution of the house, the house is divided into two types of connection piece concentration and sporadic distribution, or a mixture of the two types. Therefore, the system for supervising the entrance and exit of the floating population pays attention to the requirements of people with different property rights in the house and attaches importance to the characteristics of different geographical distributions of the house. Furthermore, the usual objectives of system engineering are to be taken into account: reduced TCO, improved reliability and versatility. The access control system of a unit cannot be cloned in a residential place of the floating population is monitored, the access decision right of the residential place of the floating population is in a tenant, the access decision right of the access control system is in the unit, the former is monitoring, and the latter is monitoring.
In view of this, information delivery system functionality is determined. Uplink data provision: an open/close door state, an illegal intrusion alarm prompt; and replying a confirmation frame of the important downlink service data, and requesting the message by the local equipment. Downlink data provision: registering authorized commands such as fingerprints/passwords and the like when the mobile phone stays in; setting or modifying the door lock parameters, and replying a confirmation frame for important business data. Considering that the home property owner has legal right to open/close the door, and does not exclude the high sensitivity of the home property owner to the secrecy of the open/close door, it is necessary to provide technical means to support the "high sensitivity", such as configuring the bluetooth module on the LoRa terminal: the house property owner is allowed to be independent of an information fusion processing platform of the information transmission system, the authorization of fingerprints/passwords and the like is automatically completed by means of the mobile phone APP, and if and only if the public security is approved, the authorization information of the fingerprints/passwords and the like can be called. The legal social requirement clears the boundary between the public right and the private right, standardizes the public right and guarantees the private right; for example, after a house is rented, other administrative departments have no right to ask for a key except for the public security; in fact, the house property owner can only acquire the consent of the lessee to enter the house.
Low Power Wide Area Network (LPWAN) is a core technology of the internet of things. The LPWAN is classified according to the spectrum used: SigFox, LoRa, etc. operating in unlicensed spectrum; operate in 2/3/4G cellular communications supported by licensed spectrum 3GPP, such as NB-IoT (NarrowBand-Internet of Things), EC-GSM, LTE-M, etc. The NB-IoT has moderate operation and maintenance cost and has the advantages of strong connection capability, strong coverage capability, low power consumption and standardization; the narrowband cellular Internet of things is deployed in the original cellular network, so that the deployment cost is low, and the technology is smoothly upgraded and has high reliability; a disadvantage of NB-IoT is that licensed spectrum that is not free mess is used. In 2016, the NB-IoT standard was approved by the International organization 3GPP and is the carrier-oriented wide area public network of Internet of things.
1 month 2015, Semcech, Cisco, and other companies established the LoRa alliance; in 2016, 1 month, Zhongxing and 20 factories establish the Chinese LoRa alliance; 2016, 7 months, final finalization by LoRa WAN specification; the netherlands KPN telecommunications and the korean SK telecommunications have deployed LoRa networks covering respective countries, providing LoRa-based internet of things services. LoRa works in an unauthorized Sub-GHz frequency band, and adopts a series of technologies such as linear frequency modulation spread spectrum frequency hopping, forward error correction, rate self-Adaptation (ADR), active and air awakening mechanisms, single-hop star networks and the like, so that the system has the characteristics of low power consumption, long distance, low cost, large network capacity and the like; WiFi, ZigBee, Bluetooth and the like facing to interconnection among devices cannot meet the requirement of the Internet of things on connection, long distance and low power consumption can be selected alternatively, LoRa fills up the technical gap, and engineering technicians can be relieved from pain choice between longer distance communication and lower power consumption. The advantage of LoRa is to use free unlicensed spectrum, which is beneficial to reduce the operating expense. The disadvantages of LoRa also arise from the use of free unlicensed spectrum, which is less than NB-IoT in terms of communication quality; meanwhile, the user needs to pay the cost for deploying and maintaining the LoRa network. LoRa and NB-IoT are competitors in the LPWAN field, and more particularly are competition partners.
At present, the typical application scenarios of LPWAN include two, decentralized/centralized application scenarios. Dispersed application scenario: users are scattered, or products are scattered over a geographical distribution, or products have mobile properties; the requirements of such application scenarios are large-scale network coverage, meeting the requirements of regional distribution and mobility attributes on the network, often dominated by consumer electronics and location-based applications. Centralized application scenario: a single client has a condition of deploying a local network in a small range, that is, a sufficient number of terminals sharing the network construction cost are provided in a local range. The information delivery system herein has both: the existing blue/white collar apartments, long-rent apartments and economic applicable rooms with integrated connection pieces; there are also scattered residential/farmer renting houses, house and property agency houses, and developer self-holding houses. Therefore, the information delivery system adopts the LoRa architecture fused into NB-IoT: NB-IoT satisfies the supervision of the entrance and exit of sporadically distributed living places, and LoRa implements the supervision of the entrance and exit of the connected centralized living places.
In 2016, the Chinese LoRa alliance was established. Initial LoRa studies focused on introduction of LoRa, performance evaluation, simple LoRa application. Over time, both the depth and breadth of the study have advanced significantly.
[1] Cattle heading.tdma-based LoRa communication network design [ J ] computer measurement and control, 2019, 27 (3): 206-210, it is proposed to accommodate multiple communication devices on the same channel by using TDMA networking method.
[2] Time delay control study [ J ] based on LoRa communication information system engineering, 2019, 34 (11): and 44-45, a timestamp exchange technology in time synchronization is adopted, so that more accurate delay control is realized.
[3] Wanping low-power-consumption communication network performance optimization technology research [ D ] Chongqing university of science and technology 2019.3 proposes to introduce an ACB (Access Class barring) mechanism to solve the congestion problem of a large number of terminals.
[4] Liu Dian.implementation method [ P ] of wireless sensor network MAC protocol based on LoRa.ZL2016103902162. provides that the gateway node divides the terminal nodes into a plurality of groups according to the distances from the gateway node to different terminal nodes, and solves the problems of small network capacity, large power consumption and poor expandability of the MAC protocol.
The beneficial exploration is a summary of LoRa research results; the research result has reference value, but has limitation, and further innovation is needed. LoRa is a complete system; no matter the TDMA networking and time stamp exchanging technology is used for reference, or an ACB mechanism and terminal node grouping are used, the LoRa system is corrected, the correction is at a cost, the universality and compatibility of the system are damaged, and the engineering feasibility needs to be verified. The LoRa complete system is maintained, the indoor/outdoor double antennas are designed, the shielding effect of a metal door on LoRa signals is overcome, the LoRa terminals can select the indoor/outdoor LoRa signals according to RSSI or SNR (wireless signals are easily affected by the environment and have more uncertainty than wired communication), and the quality of an information transmission system is improved; aiming at the problem that the LC filtering effect of the LoRa signal is not good enough, the filtering effect is improved by means of a surface acoustic wave filter; the law that the floating population comes in and goes out of the place of residence is different from person to person for the reason that the people set up the LoRa mode of operation as required, compromise low-power consumption and the real-time of information transfer system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an information transmission system and an information transmission method for supervising the entrance and exit of floating population residential places.
The information transmission system for monitoring the entrance and exit of the living places of the floating population consists of an LoRa terminal set, an LoRa gateway, an NB-IoT terminal set, an NB-IoT base station and an information fusion processing platform; the LoRa terminal set comprises a first LoRa terminal and sequentially increases to an Nth LoRa terminal; the NB-IoT terminal set comprises a first NB-IoT terminal and sequentially increases to an Mth NB-IoT terminal; the system comprises an LoRa terminal set, an LoRa gateway, an NB-IoT terminal set, an NB-IoT base station and a cellular wireless communication transmission information; the LoRa gateway and the NB-IoT base station access the information fusion processing platform through the Internet;
the first LoRa terminal is composed of a LoRa module, an RFID module, a Bluetooth module, a master control and data processing module, a fingerprint password module, a motor module and an address module, wherein the LoRa module, the RFID module, the Bluetooth module, the fingerprint password module, the motor module and the address module are respectively connected with the master control and data processing module; the LoRa module comprises an antenna selection unit, a transceiving switching unit, a transceiving filtering unit and a LoRa transceiving unit, downlink data of the LoRa gateway passes through the antenna selection unit, the transceiving switching unit and the transceiving filtering unit to the LoRa transceiving unit, and uplink data of the LoRa module is vice versa;
the LoRa modules of other LoRa terminals in the LoRa terminal set are the same as the LoRa module of the first LoRa terminal; the LoRa terminal of the LoRa terminal set is similar to the NB-IoT terminal of the NB-IoT terminal set, and the only difference between the LoRa terminal set and the NB-IoT terminal is that a main control and data processing module of the LoRa terminal is connected with the LoRa module through an SPI interface, and a main control and data processing module of the NB-IoT terminal is connected with the NB-IoT module through a USART interface; the information transmission system adopts an LoRa architecture fused with NB-IoT, an indoor/outdoor double antenna is configured on the LoRa module, a filter circuit of a surface acoustic wave filter and a Bluetooth module, and according to the data of entrance and exit of a resident place of a lessee, a LoRa working mode is set as required by people; the indoor/outdoor dual antenna of the LoRa module is respectively positioned at the indoor/outdoor side of the door of the resident place of the floating population.
The antenna selection unit comprises an indoor antenna, an outdoor antenna and an SPDT analog switch, the model of the SPDT is Ts5a3154, the antenna of the indoor antenna is arranged on the indoor side of the resident place door of the floating population, and the antenna of the outdoor antenna is arranged on the outdoor side of the resident place door of the floating population; antenna warp C of indoor antenna111、L111、 C112Formed pi-type filter circuit, C113The pin 7 of the Ts5a3154 is connected, and the pin 6 of the Ts5a3154 is connected with the door external antenna and the door internal antenna; pins 2, 3 and 4 of Ts5a3154 are grounded, and pins 5 and 1 are connected with terminals Switch1 and A respectively&A is connected externally; when Switch1 is low, pin 1 of Ts5a3154 turns on pin 7, i.e., enables the indoor antenna, and when Switch1 is high, pin 1 of Ts5a3154 turns on pin 6, i.e., enables the outdoor antenna.
The receiving and transmitting switching unit takes an AS179 radio frequency switch chip AS a core, an AS179 pin 2 is grounded, and pins 5, 1 and 3 are respectively connected with the terminal A&A is connected with RF _ Receive1 and RF _ Send1, and pins 6 and 4 are respectively connected through R121、R122Connected with terminals Switch2_1, Switch2_2, C121、C122Are connected at one end to pins 6, 4 of AS179, respectively, C121、C122The other end of the first and second electrodes is grounded; when Switch2_1 is low and Switch2_2 is high, pin 5 turns on pin 1, i.e. the LoRa module is in a receiving state; when Switch2_1 is high and Switch2_2 is low, pin 5 turns on pin 3, i.e., the LoRa module is in transmitting state.
The receiving and transmitting filter unit comprises a surface acoustic wave filter of a receiving circuit and a C132、L131、C133Pi-type filter circuit formed, and C of transmission circuit142、L141，C144、L142The two groups of resonance filter circuits are connected in parallel and then connected in series; the surface acoustic wave filter takes an 8572115 chip as a core, pins 1, 3, 4 and 6 of 8572115 are grounded, pin 2 is connected with a terminal RF _ Receive1, and pin 5 passes through C131The pi-type filter circuit is connected with a terminal RF _ Receive 2; two groups of parallel and series resonance filter circuit C142One end, C141Is connected to terminal RF _ Send1, C141The other end of the first and second electrodes is grounded; two groups of parallel and series resonance filter circuit C144One terminal, C145Is passed through C at one end146Connected to terminal RF _ Send2, C145The other end of the first and second electrodes is grounded; c147One end of, L143Is connected to terminal RF _ Send2_1, C147Is grounded at the other end, L143Another end of (1) and C148Is connected to terminal RF _ Send2_2, C148The other end of the first and second electrodes is grounded; c149Is connected to terminal RF _ Send2_3, C149And the other end of the same is grounded.
The LoRa transceiver unit takes an SX1278 chip as a core, pins 1, 27, 25 and 24 of the SX1278 are respectively connected with terminals RF _ Receive2, RF _ Send2_1, RF _ Send2_2 and RF _ Send2_3, pins 16 to 19 of the SX1278 are respectively connected with terminals SCLK, MISO, MOSI and NSS, and pins 8 to 13 of the SX1278 are respectively connected with a terminal DIO0～DIO5Connecting; DIO when SX1278 reception/transmission is completed0～DIO5And executing interrupt output.
The main control and data processing module of the first LoRa terminal takes an STM32F103 chip as a core, pins 14-17 of the STM32F103 are respectively connected with terminals NSS, SCLK, MISO and MOSI, and pins 37-42 are respectively connected with terminals DIO0～DIO5The STM32F103 controls the receiving and sending of the LoRa module wireless signals and data processing; pins 18-20 of the STM32F103 are connected to terminals Switch1, Switch2_1 and Switch2_2, respectively, and select an in-gate or an out-gate antenna of the LoRa module to determine the transceiving state of the LoRa module, which is shown in table 1;
table 1 internal/external antenna selection and transceiving state conversion table of LoRa terminal gate
The RFID module takes an MFRC523 chip as a core, and an STM32F103 of the main control and data processing module is connected with the MFRC523 through an SPI interface; the Bluetooth module is ATK-HC05, the fingerprint code module is BS600T, and the Bluetooth module and the fingerprint code module are respectively connected with the STM32F103 through USART2 and USART3 interfaces; the motor module takes an L9110 motor driving chip as a core, pins 29 and 30 of an STM32F103 are respectively connected with pins 6 and 7 of an L9110, and pins 1 and 2 of the L9110 are respectively connected to two ends of a motor;
the address module comprises an 8-bit parallel-in serial-out shift register and a DIPSwitch 8-bit dial switch, wherein the model of the 8-bit parallel-in serial-out shift register is 74HC 165; STM32F103 pins 31-34 of the main control and data processing module are respectively connected with pins 1, 15, 2 and 9 of 74HC165, pins 11-14 and 3-6 of 74HC165 are respectively connected with terminals SW 1-SW 8, and one end SW 1-SW 8 terminals of a DIPSwitch 8-bit toggle switch are respectively connected with a power supply through R1～R8Is connected with VCCThe other end of the DIPSwitch 8-bit dial switch is grounded, an 8-bit switching value address is input into the DIPSwitch 8-bit dial switch, and the parallel 8-bit address is converted into an 8-bit digital value to be output to the STM32F103 of the main control and data processing module in series.
The LoRa gateway comprises a 1 st radio frequency modulation and demodulation module, a 2 nd radio frequency modulation and demodulation module, a digital baseband processing module, a control and data processing module and a serial port to network port module, wherein the 1/2 th radio frequency modulation and demodulation module takes an SX1255 chip as a core, the digital baseband processing module takes an SX1301 chip as a core, the control and data processing module takes an STM32F745 chip as a core, and the serial port to network port module is ZLSN 3000; the 1 st radio frequency modulation and demodulation module and the 2 nd radio frequency modulation and demodulation module are respectively connected with the digital baseband processing module through SPI interfaces, the digital baseband processing module is connected with the control and data processing module through SPI interfaces, and the control and data processing module is accessed to the Internet through a serial port network switching module.
The information transmission method flow for monitoring the entrance and exit of the living places of the floating population comprises a preparation flow of the information transmission method and an operation flow of the information transmission method;
description of variables
Signal strength RSSI
SNR
Periodic Period
State
Detection Period inside/outside of Period _ a, 7day of inside/outside antenna
Status of in/out antenna State _ a in/out antenna, in/out antenna 0/1, default value 0
LoRa working mode detection Period _ Class A & C, 7day
State _ Class A & C of working mode, State _ Class A/B/C1/2/3
Default values of 7-9 and 17-19 are that State _ Class A & C is 3, and the rest time periods are 1
Description of the Algorithm
Detecting and adjusting internal/external antenna
According to the detection period of the internal/external antenna, the LoRa gateway starts the detection of the internal/external antenna
The LoRa terminal uploads 4 times of acknowledgement frames according to the appointed internal/external antenna sequence
Average filtering is carried out on 4 times of acknowledgement frame signals uploaded by internal/external antennas by LoRa gateway
Based on the RSSI criteria, the average value is large, and the in/out antenna is adjusted and used according to the table 1
② detection and adjustment of LoRa terminal working mode
Detection of LoRa gateway startup mode according to detection period of LoRa mode
LoRa terminal uploads statistical data of residence entrance and exit of floating population
According to the rule of corresponding ClassC working mode in the high-frequency access period
Working period of LoRa gateway adjusting LoRa terminal Class A/C
LoRa terminal uses DeviceModeInd/DeviceModeConf
LoRa gateway uses DeviceModeConf commands
Information fusion of LoRa and NB-IoT
LoRa application layer data frame structure
| Length (byte) | 2 | 1 | 2 | 2 | |
2 |
| Function(s) | Frame control | Sequence code | Destination address | Source address | Payload | CRC |
NB-IoT transmit packet format
The information fusion processing platform extracts data of LoRa and NB-IoT;
preparation flow of information transmission method
1. The LoRa network is deployed in the connected centralized living place, and the DIPSwitch sets the LoRa terminal address
Installing and debugging NB-IoT terminals in sporadically distributed living places, and setting NB-IoT terminal addresses
2. Default values of LoRa working mode and internal/external antenna state are set
Setting the detection period of the internal/external antenna and the detection period of the LoRa working mode
Downloading a mobile phone APP authorized by the fingerprint/password by the house property owner;
operation flow of information transmission method
1. According to the algorithm (r) and table 1, the indoor/outdoor antenna is used and the receiving/transmitting state is switched
2. According to the algorithm II, the working mode of the LoRa terminal is adjusted
3. Fusing the data of the LoRa and the NB-IoT according to the algorithm (c).
Compared with the background technology, the invention has the following beneficial effects:
the LoRa architecture fused with the NB-IoT meets the requirements of sporadic distribution and in-and-out supervision of connected centralized living places, and the TCO of the system is reduced; an internal/external double antenna is designed according to the maintenance system LoRa complete system, so that the shielding effect of a metal door on LoRa signals is eliminated, and the reliability of the system is improved; an LC filter circuit of LoRa is improved by means of a surface acoustic wave filter, and a Bluetooth module ensures the legal power of opening/closing door authorization of a house property owner; according to the in-out data of the tenant residence, the LoRa working mode is set for the user, and the low power consumption and the real-time performance of the system are considered.
Drawings
FIG. 1 is a functional block diagram of a signal transmission system;
fig. 2 is a functional block diagram of a LoRa terminal;
FIG. 3 is a block diagram of a LoRa module;
fig. 4 is a circuit diagram of an antenna selection unit;
fig. 5 is a circuit diagram of a transceiving switching unit;
fig. 6 is a circuit diagram of a transceiving filtering unit;
fig. 7 is a circuit diagram of a LoRa transceiver unit;
fig. 8 is a circuit diagram of a LoRa terminal;
fig. 9 is a functional block diagram of a LoRa gateway;
fig. 10 is a functional block diagram of an NB-IoT terminal;
FIG. 11(a) is a flow chart of a method of information delivery;
FIG. 11(b) is a preparatory flow chart for the message delivery method;
fig. 11(c) is an operation flowchart of the information delivery method.
Detailed Description
As shown in fig. 1, fig. 2, fig. 3, and fig. 10, the information delivery system for supervising entrance and exit of the floating population living space is composed of an LoRa terminal set 10, an LoRa gateway 20, an NB-IoT terminal set 30, an NB-IoT base station 40, and an information fusion processing platform 50; the LoRa terminal set 10 comprises a first LoRa terminal 11, and sequentially increases to an Nth LoRa terminal 1N, wherein N is more than or equal to 1; the NB-IoT terminal set 30 comprises a first NB-IoT terminal 31 which sequentially increases to a MNB-IoT terminal 3M, wherein M is more than or equal to 1; the LoRa terminal set 10 and the LoRa gateway 20, and the NB-IoT terminal set 30 and the NB-IoT base station 40 respectively transmit information by means of LoRa and cellular wireless communication; the LoRa gateway 20 and the NB-IoT base station 40 access the information fusion processing platform 50 through the Internet;
the first LoRa terminal 11 is composed of a LoRa module 100, an RFID module 200, a bluetooth module 300, a master control and data processing module 500, a fingerprint password module 600, a motor module 700 and an address module 800, wherein the LoRa module 100, the RFID module 200, the bluetooth module 300, the fingerprint password module 600, the motor module 700 and the address module 800 are respectively connected with the master control and data processing module 500; the LoRa module 100 includes an antenna selection unit 110, a transceiving switching unit 120, a transceiving filtering unit 130, and an LoRa transceiving unit 140, where downlink data of the LoRa gateway 20 passes through the antenna selection unit 110, the transceiving switching unit 120, the transceiving filtering unit 130 to the LoRa transceiving unit 140, and vice versa for uplink data of the LoRa module 100;
the LoRa modules of other LoRa terminals in the LoRa terminal set 10 are the same as the LoRa module 100 of the first LoRa terminal 11; the LoRa terminal of the LoRa terminal set 10 is similar to the NB-IoT terminal of the NB-IoT terminal set 30, and the only difference between the LoRa terminal and the NB-IoT terminal is that the main control and data processing module of the LoRa terminal is connected to the LoRa module through the SPI interface, and the main control and data processing module of the NB-IoT terminal is connected to the NB-IoT module through the USART interface; the information transmission system adopts an LoRa architecture fused with NB-IoT, an indoor/outdoor double antenna, a filter circuit of a surface acoustic wave filter and a Bluetooth module are configured in the LoRa module, and according to the access data of a tenant dwelling place, a LoRa working mode is set as required by people; the indoor/outdoor dual antenna of the LoRa module is respectively positioned at the indoor/outdoor side of the door of the resident place of the floating population.
Description 1: the NB-IoT base station 40 and the information fusion processing platform 50 are briefly described in consideration of the integrity of the content; the NB-IoT base station 40 and the information fusion processing platform 50 are mature products, and belong to the known knowledge domain; reference is made to the drawings without departing from the scope of the discussion, and the drawings are distinguished by dashed box marks. The configuration of the LoRa terminal can be simplified as required, such as two RFID modules and two fingerprint password modules. The wireless channel has more uncertainty;on-site measurement and comparison of indoor/outdoor antenna received signals The quality of (1) is changed with time。
As shown in fig. 4, the antenna selection unit 110 includes an indoor antenna 111, an outdoor antenna 112, and an SPDT analog switch 113, the model of the SPDT is Ts5a3154, the antenna of the indoor antenna 111 is installed on the indoor side of the floating population residential site door, and the antenna of the outdoor antenna 112 is installed on the outdoor side of the floating population residential site door; antenna warp C of in-door antenna 111111、L111、C112Formed pi-type filter circuit, C113The pin 7 of the Ts5a3154 is connected, the door outer antenna 112 is the same as the door inner antenna 111, and the pin 6 of the Ts5a3154 is connected; pins 2, 3 and 4 of Ts5a3154 are grounded, and pins 5 and 1 are connected with terminals Switch1 and A respectively&A is connected externally; when Switch1 is low, pin 1 of Ts5a3154 turns on pin 7, i.e., enables the in-door antenna 111, and when Switch1 is high, pin 1 of Ts5a3154 turns on pin 6, i.e., enables the out-door antenna 112.
As shown in FIG. 5, the transmit/receive switching unit 120 uses the AS179 RF switch chip AS the core, the AS179 pin 2 is grounded, and the pins 5, 1, 3 are connected to the terminal A&A is connected with RF _ Receive1 and RF _ Send1, and pins 6 and 4 are respectively connected through R121、R122Is connected with terminals Switch2_1 and Switch2_2，C121、C122Are connected at one end to pins 6, 4 of AS179, respectively, C121、C122The other end of the first and second electrodes is grounded; when Switch2_1 is low and Switch2_2 is high, pin 5 turns on pin 1, i.e. the LoRa module 100 is in a receiving state; when Switch2_1 is high and Switch2_2 is low, pin 5 turns on pin 3, i.e., the LoRa module 100 switches to the transmitting state.
As shown in fig. 6, the transceiving filter unit 130 includes surface acoustic wave filters 131, C of a receiving circuit132、 L131、C133Formed pi-type filter circuit 132, and C of transmission circuit142、L141，C144、L142Two sets of resonance filter circuits 133 connected in parallel and then connected in series; the saw filter 131 takes an 8572115 chip as a core, pins 1, 3, 4 and 6 of 8572115 are grounded, pin 2 is connected with a terminal RF _ Receive1, and pin 5 is connected with a terminal C _ Receive1 through a C131The pi filter circuit 132 is connected to the terminal RF _ Receive 2; c of two parallel re-series resonant filter circuits 133142One end, C141Is connected to terminal RF _ Send1, C141The other end of the first and second electrodes is grounded; two sets of C of parallel and re-series resonant filter circuits 133144One end, C145Is passed through C at one end146Connected to terminal RF _ Send2, C145The other end of the first and second electrodes is grounded; c147One end of, L143Is connected to terminal RF _ Send2_1, C147Is grounded at the other end, L143Another end of (1) and C148Is connected to terminal RF _ Send2_2, C148The other end of the first and second electrodes is grounded; c149Is connected to terminal RF _ Send2_3, C149And the other end of the same is grounded.
As shown in fig. 7, the LoRa transceiver unit 140 uses an SX1278 chip as a core, wherein the pins 1, 27, 25, and 24 of the SX1278 are respectively connected to the terminals RF _ Receive2, RF _ Send2_1, RF _ Send2_2, and RF _ Send2_3, the pins 16 to 19 of the SX1278 are respectively connected to the terminals SCLK, MISO, MOSI, and NSS, and the pins 8 to 13 of the SX1278 are respectively connected to the terminal DIO0～DIO5Connecting; DIO when SX1278 reception/transmission is completed0～DIO5And executing interrupt output.
As shown in fig. 8, the master control and data of the first LoRa terminal 11The processing module 500 takes an STM32F103 chip as a core, pins 14-17 of the STM32F103 are respectively connected with terminals NSS, SCLK, MISO and MOSI, and pins 37-42 are respectively connected with terminals DIO0～DIO5The STM32F103 controls the receiving and sending of the LoRa module 100 wireless signals and data processing; pins 18-20 of the STM32F103 are connected to terminals Switch1, Switch2_1, and Switch2_2, respectively, and select an in-door or an out-door antenna of the LoRa module 100 to determine the transceiving state of the LoRa module 100, which is detailed in table 1;
table 1 internal/external antenna selection and transceiving state conversion table of LoRa terminal gate
The RFID module 200 takes an MFRC523 chip as a core, and the STM32F103 of the main control and data processing module 500 is connected with the MFRC523 through an SPI interface; the Bluetooth module 300 is ATK-HC05, the fingerprint code module 600 is BS600T, and is connected with the STM32F103 through USART2 and USART3 interfaces respectively; the motor module 700 takes an L9110 motor driving chip as a core, pins 29 and 30 of an STM32F103 are respectively connected with pins 6 and 7 of an L9110, and pins 1 and 2 of the L9110 are respectively connected to two ends of a motor;
the address module 800 comprises an 8-bit merging-and-exiting shift register 810 and a DIPSwitch 8-bit dial switch 820, wherein the model number of the 8-bit merging-and-exiting shift register 810 is 74HC 165; STM32F103 pins 31-34 of the main control and data processing module 500 are respectively connected with pins 1, 15, 2 and 9 of 74HC165, pins 11-14 and 3-6 of 74HC165 are respectively connected with terminals SW 1-SW 8, and one end SW 1-SW 8 terminals of a DIPSwitch8 bit dial switch 820 are respectively connected with a R terminal through a R terminal1～R8Is connected with VCCThe other end of the dip switch8 bit toggle switch 820 is grounded, the dip switch8 bit toggle switch 820 inputs 8-bit switching value addresses, and the parallel 8-bit addresses are converted into 8-bit digital values to be output to the STM32F103 of the main control and data processing module 500 in series.
Description 2: the RFID module 200, the Bluetooth module 300 and the fingerprint code module 600 are briefly described in consideration of the completeness of the content; since the above modules are mature products and belong to the field of common knowledge, only the unexploded discussion is mentioned herein, and the figures are marked by dashed boxes for distinction; the door lock opening and closing sensor is a mature standard configuration of the door lock, and is not considered in the text for the sake of brevity. If the address module 800 further adds a dip switch 4-bit toggle switch and a matching circuit, the address of the LoRa terminal is extended to 12 bits.
As shown in fig. 9, the LoRa gateway 20 includes a 1 st rf modem module 21, a 2 nd rf modem module 22, a digital baseband processing module 23, a control and data processing module 24, and a serial port to network port module 25, where the 1 st rf modem module 21 uses an SX1255 chip as a core, the 2 nd rf modem module 22 is the same as the 1 st rf modem module 21, the digital baseband processing module 23 uses an SX1301 chip as a core, the control and data processing module 24 uses an STM32F745 chip as a core, and the serial port to network port module 25 is ZLSN 3000; the 1 st radio frequency modulation and demodulation module 21 and the 2 nd radio frequency modulation and demodulation module 22 are respectively connected with the digital baseband processing module 23 through SPI interfaces, the digital baseband processing module 23 is connected with the control and data processing module 24 through SPI interfaces, and the control and data processing module 24 is connected with the Internet through a serial port and network port module 25.
Description 3: the public version of the design of SX1255, SX1301 is briefly described for completeness of content.
As shown in fig. 11(a), 11(b), and 11(c), the flow of the information delivery method for supervising entrance and exit of the floating population living space includes a preparation flow of the information delivery method and an operation flow of the information delivery method;
description of variables
Signal strength RSSI
SNR
Periodic Period
State
Detection Period inside/outside of Period _ a, 7day of inside/outside antenna
Status of in/out antenna State _ a in/out antenna, in/out antenna 0/1, default value 0
LoRa working mode detection Period _ Class A & C, 7day
State _ Class A & C of working mode, State _ Class A/B/C1/2/3
Default values of 7-9 and 17-19 are that State _ Class A & C is 3, and the rest time periods are 1
Description of the Algorithm
Detecting and adjusting internal/external antenna
According to the detection period of the indoor/outdoor antenna, the LoRa gateway 20 starts the detection of the indoor/outdoor antenna
The LoRa terminal uploads 4 times of acknowledgement frames according to the appointed internal/external antenna sequence
The LoRa gateway 20 performs mean filtering on the 4-time acknowledgement frame signals uploaded by the internal/external antennas
Based on the RSSI criteria, the average value is large, and the in/out antenna is adjusted and used according to the table 1
② detection and adjustment of LoRa terminal working mode
Detection of the activation mode of the LoRa gateway 20 according to the detection period of the LoRa mode
LoRa terminal uploads statistical data of residence entrance and exit of floating population
According to the rule of corresponding ClassC working mode in the high-frequency access period
Working period of adjusting Class A/C of LoRa terminal by LoRa gateway 20
LoRa terminal uses DeviceModeInd/DeviceModeConf
The LoRa gateway 20 uses DeviceModeConf commands
Information fusion of LoRa and NB-IoT
LoRa application layer data frame structure
| Length (byte) | 2 | 1 | 2 | 2 | |
2 |
| Function(s) | Frame control | Sequence code | Destination address | Source address | Payload | CRC |
NB-IoT transmit packet format
The information fusion processing platform 50 extracts data of LoRa and NB-IoT;
preparation flow of information transmission method
1. The LoRa network is deployed in the connected centralized living place, and the DIPSwitch sets the LoRa terminal address
Installing and debugging NB-IoT terminals in sporadically distributed living places, and setting NB-IoT terminal addresses
2. Default values of LoRa working mode and internal/external antenna state are set
Setting the detection period of the internal/external antenna and the detection period of the LoRa working mode
Downloading a mobile phone APP authorized by the fingerprint/password by the house property owner;
operation flow of information transmission method
1. According to the algorithm (r) and table 1, the indoor/outdoor antenna is used and the receiving/transmitting state is switched
2. According to the algorithm II, the working mode of the LoRa terminal is adjusted
3. Fusing the data of the LoRa and the NB-IoT according to the algorithm (c).
Description 4: in consideration of the simplicity of expression, the contents of an application layer and a perception layer of the Internet of things are not involved: open/close door status, illegal intrusion alarm, fingerprint/password authorization, etc.; the time period of the LoRa terminal working mode Class A/C can have more intervals; the detection criterion of the indoor/outdoor antenna can use SNR besides RSSI, and can also use a strategy of deciding by operation and maintenance personnel when the results are inconsistent.
Claims (8)
1. An information transmission system for supervising entrance and exit of a living place of a floating population is characterized by comprising an LoRa terminal set (10), an LoRa gateway (20), an NB-IoT terminal set (30), an NB-IoT base station (40) and an information fusion processing platform (50); the LoRa terminal set (10) comprises a first LoRa terminal (11) which is sequentially increased to an Nth LoRa terminal (1N), and N is more than or equal to 1; the NB-IoT terminal set (30) comprises a first NB-IoT terminal (31) which sequentially increases to an Mth NB-IoT terminal (3M), wherein M is larger than or equal to 1; the system comprises an LoRa terminal set (10), an LoRa gateway (20), an NB-IoT terminal set (30) and an NB-IoT base station (40), wherein information is transmitted by means of LoRa and cellular wireless communication respectively; the LoRa gateway (20) and the NB-IoT base station (40) access the information fusion processing platform (50) through the Internet;
the first LoRa terminal (11) is composed of a LoRa module (100), an RFID module (200), a Bluetooth module (300), a main control and data processing module (500), a fingerprint password module (600), a motor module (700) and an address module (800), wherein the LoRa module (100), the RFID module (200), the Bluetooth module (300), the fingerprint password module (600), the motor module (700) and the address module (800) are respectively connected with the main control and data processing module (500); the LoRa module (100) comprises an antenna selection unit (110), a transceiving switching unit (120), a transceiving filtering unit (130) and a LoRa transceiving unit (140), downlink data of the LoRa gateway (20) passes through the antenna selection unit (110), the transceiving switching unit (120), the transceiving filtering unit (130) to the LoRa transceiving unit (140), and vice versa uplink data of the LoRa module (100);
the LoRa modules of other LoRa terminals in the LoRa terminal set (10) are the same as the LoRa module (100) of the first LoRa terminal (11); the LoRa terminal of the LoRa terminal set (10) is similar to the NB-IoT terminal of the NB-IoT terminal set (30), and the only difference between the LoRa terminal and the NB-IoT terminal is that a main control and data processing module of the LoRa terminal is connected with the LoRa module through an SPI interface, and the main control and data processing module of the NB-IoT terminal is connected with the NB-IoT module through a USART interface; the information transmission system adopts an LoRa architecture fused with NB-IoT, an indoor/outdoor double antenna is configured on the LoRa module, a filter circuit of a surface acoustic wave filter and a Bluetooth module, and according to the data of entrance and exit of a resident place of a lessee, a LoRa working mode is set as required by people; the indoor/outdoor dual antenna of the LoRa module is respectively positioned at the indoor/outdoor side of the door of the resident place of the floating population.
2. The information transmission system for supervising entrance and exit of the floating population residential space according to claim 1, wherein the antenna selection unit (110) comprises an indoor antenna (111), an outdoor antenna (112) and an SPDT analog switch (113), the type of the SPDT is Ts5a3154, the antenna of the indoor antenna (111) is installed at the indoor side of the floating population residential space door, and the antenna of the outdoor antenna (112) is installed at the outdoor side of the floating population residential space door; antenna warp C of in-door antenna (111)111、L111、C112Formed pi-type filter circuit, C113The pin 7 of the Ts5a3154 is connected, the door outer antenna (112) is the same as the door inner antenna (111), and the pin 6 of the Ts5a3154 is connected; pins 2, 3 and 4 of Ts5a3154 are grounded, and pins 5 and 1 are connected with terminals Switch1 and A respectively&A is connected externally; when Switch1 is low, pin 1 of Ts5a3154 turns on pin 7, i.e., enables the in-door antenna (111), and when Switch1 is high, pin 1 of Ts5a3154 turns on pin 6, i.e., enables the out-door antenna (112).
3. The system of claim 1, wherein the system is configured to monitor entrance and exit of floating population living quartersThe system is characterized in that the transceiving switching unit (120) takes an AS179 radio frequency switch chip AS a core, an AS179 pin 2 is grounded, and pins 5, 1 and 3 are respectively connected with the terminal A&A is connected with RF _ Receive1 and RF _ Send1, and pins 6 and 4 are respectively connected through R121、R122Connected with terminals Switch2_1, Switch2_2, C121、C122Are connected at one end to pins 6, 4 of AS179, respectively, C121、C122The other end of the first and second electrodes is grounded; when Switch2_1 is low and Switch2_2 is high, pin 5 turns on pin 1, i.e. the LoRa module (100) is in a receiving state; when Switch2_1 is high and Switch2_2 is low, pin 5 turns on pin 3, i.e., the LoRa module (100) switches to the transmitting state.
4. The system for monitoring entrance and exit of floating population living quarters as claimed in claim 1, wherein said transceiving filter unit (130) comprises a surface acoustic wave filter (131) of a receiving circuit, C132、L131、C133A filter circuit (132) of pi type formed, and C of the transmission circuit142、L141，C144、L142Resonance filter circuits (133) connected in parallel into two groups and then connected in series; the surface acoustic wave filter (131) takes an 8572115 chip as a core, pins 1, 3, 4 and 6 of 8572115 are grounded, pin 2 is connected with a terminal RF _ Receive1, and pin 5 passes through C131The pi filter circuit (132) is connected to a terminal RF _ Receive 2; c of two parallel and series resonant filter circuits (133)142One end, C141Is connected to terminal RF _ Send1, C141The other end of the first and second electrodes is grounded; c of two parallel and series resonant filter circuits (133)144One end, C145Is passed through C at one end146Connected to terminal RF _ Send2, C145The other end of the first and second electrodes is grounded; c147One end of, L143Is connected to terminal RF _ Send2_1, C147Is grounded at the other end, L143Another end of (1) and C148Is connected to terminal RF _ Send2_2, C148The other end of the first and second electrodes is grounded; c149Is connected to terminal RF _ Send2_3, C149And the other end of the same is grounded.
5. The system of claim 1, wherein the LoRa transceiver unit (140) comprises a SX1278 chip, wherein the SX1278 pins 1, 27, 25 and 24 are respectively connected to terminals RF _ Receive2, RF _ Send2_1, RF _ Send2_2 and RF _ Send2_3, the SX1278 pins 16-19 are respectively connected to terminals SCLK, MISO, MOSI and NSS, and the SX1278 pins 8-13 are respectively connected to terminals DIO0～DIO5Connecting; DIO when SX1278 reception/transmission is completed0～DIO5And executing interrupt output.
6. The information transmission system for supervising entrance and exit of residential places of mobile population according to claim 1, wherein the main control and data processing module (500) of the first LoRa terminal (11) takes an STM32F103 chip as a core, pins 14-17 of the STM32F103 are respectively connected with terminals NSS, SCLK, MISO and MOSI, and pins 37-42 are respectively connected with terminals DIO0～DIO5The STM32F103 controls the receiving and sending of the wireless signals of the LoRa module (100) and data processing; pins 18-20 of the STM32F103 are respectively connected with terminals Switch1, Switch2_1 and Switch2_2, and an indoor antenna or an outdoor antenna of the LoRa module (100) is selected to determine the transceiving state of the LoRa module (100), which is detailed in table 1;
table 1 internal/external antenna selection and transceiving state conversion table of LoRa terminal gate
The RFID module (200) takes an MFRC523 chip as a core, and an STM32F103 of the main control and data processing module (500) is connected with the MFRC523 through an SPI interface; the Bluetooth module (300) is ATK-HC05, the fingerprint code module (600) is BS600T, and the Bluetooth module is connected with the STM32F103 through USART2 and USART3 interfaces; the motor module (700) takes an L9110 motor driving chip as a core, pins 29 and 30 of an STM32F103 are respectively connected with pins 6 and 7 of an L9110, and pins 1 and 2 of the L9110 are respectively connected to two ends of a motor;
the address module (800) comprises an 8-bit merging-in-and-out shift register (810) and a DIPSwitch 8-bit dial switch (820), wherein the model of the 8-bit merging-in-and-out shift register (810) is 74HC 165; 31-34 points of STM32F103 of main control and data processing module (500)Are respectively connected with pins 1, 15, 2 and 9 of a 74HC165, pins 11 to 14, 3 to 6 of the 74HC165 are respectively connected with terminals SW1 to SW8, and terminals SW1 to SW8 at one end of a DIPSwitch 8-bit dial switch (820) are respectively connected with a power supply through R1～R8Is connected with VCCThe other end of the DIPSwitch 8-bit toggle switch (820) is grounded, an 8-bit switching value address is input into the DIPSwitch 8-bit toggle switch (820), and the parallel 8-bit address is converted into an 8-bit digital value to be output to the STM32F103 of the main control and data processing module (500) in series.
7. The information transmission system for supervising entrance and exit of the residential space of floating population according to claim 1, characterized in that the LoRa gateway (20) comprises a 1 st rf modem module (21), a 2 nd rf modem module (22), a digital baseband processing module (23), a control and data processing module (24), and a serial port to network port module (25), wherein the 1 st rf modem module (21) uses an SX1255 chip as a core, the 2 nd rf modem module (22) is the same as the 1 st rf modem module (21), the digital baseband processing module (23) uses an SX1301 chip as a core, the control and data processing module (24) uses an STM32F745 chip as a core, and the serial port to network port module (25) has a model number ZLSN 3000; the 1 st radio frequency modulation and demodulation module (21) and the 2 nd radio frequency modulation and demodulation module (22) are respectively connected with the digital baseband processing module (23) through SPI interfaces, the digital baseband processing module (23) is connected with the control and data processing module (24) through SPI interfaces, and the control and data processing module (24) is connected with the Internet through a serial port and network port conversion module (25).
8. An information transmission method for supervising entrance and exit of residential areas of floating population according to claim 1, wherein the flow of the method comprises a preparation flow of the information transmission method, an operation flow of the information transmission method;
description of variables
Signal strength RSSI
SNR
Periodic Period
State
Detection Period inside/outside of Period _ a, 7day of inside/outside antenna
Status of in/out antenna State _ a in/out antenna, in/out antenna 0/1, default value 0
LoRa working mode detection Period _ Class A & C, 7day
State _ Class A & C of working mode, State _ Class A/B/C1/2/3
Default values of 7-9 and 17-19 are that State _ Class A & C is 3, and the rest time periods are 1
Description of the Algorithm
Detecting and adjusting internal/external antenna
According to the detection period of the internal/external antenna, the LoRa gateway (20) starts the detection of the internal/external antenna
The LoRa terminal uploads 4 times of acknowledgement frames according to the appointed internal/external antenna sequence
The LoRa gateway (20) performs mean value filtering on the 4-time acknowledgement frame signals uploaded by the internal/external antenna
Based on the RSSI criteria, the average value is large, and the in/out antenna is adjusted and used according to the table 1
② detection and adjustment of LoRa terminal working mode
According to the detection period of the LoRa working mode, the LoRa gateway (20) starts the detection of the working mode
LoRa terminal uploads statistical data of residence entrance and exit of floating population
According to the rule of corresponding ClassC working mode in the high-frequency access period
The LoRa gateway (20) adjusts the working period of the Class A/C of the LoRa terminal
LoRa terminal uses DeviceModeInd/DeviceModeConf
LoRa gateway (20) uses DeviceModeConf commands
Information fusion of LoRa and NB-IoT
LoRa application layer data frame structure
NB-IoT transmit packet format
The information fusion processing platform (50) extracts data of LoRa and NB-IoT;
preparation flow of information transmission method
1. The LoRa network is deployed in the connected centralized living place, and the DIPSwitch sets the LoRa terminal address
Installing and debugging NB-IoT terminals in sporadically distributed living places, and setting NB-IoT terminal addresses
2. Default values of LoRa working mode and internal/external antenna state are set
Setting the detection period of the internal/external antenna and the detection period of the LoRa working mode
Downloading a mobile phone APP authorized by the fingerprint/password by the house property owner;
operation flow of information transmission method
1. According to the algorithm (r) and table 1, the indoor/outdoor antenna is used and the receiving/transmitting state is switched
2. According to the algorithm II, the working mode of the LoRa terminal is adjusted
3. Fusing the data of the LoRa and the NB-IoT according to the algorithm (c).
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