CN114171175B - Hospital material refinement management system based on RFID and multi-terminal communication - Google Patents
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Abstract
The application belongs to the field of medical logistics, in particular to a hospital supplies fine management system based on RFID and multi-terminal communication, which comprises an NBLOT system, a medical supplies management system and a frequency mixing network system; the frequency mixing network system comprises an X-type gateway, a Y-type gateway, a same-frequency node and a different-frequency node, wherein the X-type gateway can be connected with the same-frequency node and the different-frequency node through an uplink channel or a downlink channel, the Y-type gateway can be connected with the same-frequency node and the different-frequency node through the uplink channel or the downlink channel, the X-type gateway and the Y-type gateway are symmetrically deployed in half duplex mode, PDAs are used for encrypting IDs of special medical materials and generating authentication codes SIDs, the IDs of the special medical materials are packaged, then the IDs of the materials and the encrypted authentication codes SIDs are combined with RFID tags, after the IDs of the special medical materials enter a warehouse, a department uses a PDA terminal to read the IDs of the special medical materials and the SIDs, and then the materials are taken out.
Description
Technical Field
The application belongs to the field of medical logistics, and particularly relates to a hospital supplies fine management system based on RFID and multi-terminal communication.
Background
RFID is one of the core technologies of the internet of things. The internet of things collects various important information such as light, electricity, position, images and the like through technologies such as a sensor, a radio frequency identification technology (RFID), a 3S technology and the like, and realizes the widely existing connection and sensing, identification, analysis, interaction and management of objects and people on the basis of widely existing networks and cloud computing, and the RFID technology is a technology for realizing automatic identification through storing and non-contact data transmission through a radio frequency identification tag or a wireless transceiver.
The conventional RFID system is generally referred to as CN 214311758U, CN 214278407U and CN 109934031B, etc., and this kind of patent mainly locates passive tags and obtains location information through RFID, but the current refined logistics management of hospitals involves problems of multi-terminal communication, node conflict problem of each department is difficult to solve, and delay and data privacy security problem of communication at edge terminals of each department are not solved.
Disclosure of Invention
The application aims to provide a hospital supplies refinement management system based on RFID and multi-terminal communication, which solves the problem that an RFID communication gateway in the hospital shares a calculation strategy, and solves the problems of time delay and department node conflict of Lora communication.
In order to achieve the above purpose, the present application provides the following technical solutions: a hospital supplies fine management system based on RFID and multiterminal communication comprises an NBLOT system, a medical supplies management system and a frequency mixing network system;
the frequency mixing network system comprises an X-type gateway, a Y-type gateway, a same-frequency node and an inter-frequency node, wherein the X-type gateway and the same-frequency node and the inter-frequency node can be connected through an uplink channel or a downlink channel, the Y-type gateway and the same-frequency node and the inter-frequency node can be connected through an uplink channel or a downlink channel, and the X-type gateway and the Y-type gateway are symmetrically deployed in a half duplex mode;
the NBLOT system comprises a plurality of Lora communication modules and terminal receiving modules, the PHY of each Lora communication module is linear spread spectrum coding, and the MAC layer of each terminal receiving module is a LoRaWAN protocol management node;
the medical material management system comprises record management, label management, traceability management and traceability statistics, wherein the record management comprises medical material allocation RFID labels, sending logistics and statistics labels.
Preferably, the usage frequency points of the uplink channel or the downlink channel of the class X gateway and the class Y gateway are different, and the uplink frequency and the downlink frequency are different.
Preferably, the method comprises the following steps:
s1, firstly, constructing an NB-LOT (network of things) -based internet of things module by a hospital, and constructing a multi-channel communication node by utilizing Lora, wherein a terminal node starts and initiates a competition channel demand through an ALOHA (ALOHA) protocol, constructing a star topology network by using an intra-hospital Lora network communication architecture, and constructing a communication system between an intra-commodity circulation terminal and each department;
s2, the NBLOT system analyzes a back-off mechanism, builds the number of times of re-penetration and the length of a buffer zone under a single terminal, and then solves the steady-state distribution throughput of a hospital warehouse;
s3, distributing the RFID tags of the medical products according to the throughput, and distributing the RFID tags by workers in a medical material management system;
s4, after the physical distribution materials of the hospital enter, a new responsibility partition is added, a system administrator stores a secret key by managing the physical distribution materials and combining with the coding real requirement of the physical distribution materials, and a public key is built in a PDA (personal digital assistant) for special label management for special physical distribution materials;
s5, using the PDA to encrypt the ID of the special medical supplies and generate an authentication code SID, packaging the special medical supplies, then combining the supply ID and the encrypted authentication code SID into an RFID tag, entering a warehouse, using the PDA terminal to read the special medical supplies ID and SID by a department, and then taking out the supplies;
preferably, for step S1, the Lora gateway parameter is deployed between each department in the hospital, and the transmission frequency of each department gateway is at least 17dBm, where the edge transmission rate of the communication between the Lora terminal nodes between each department is:
wherein BW is network bandwidth, xi is uplink transmission proportion, SINR l For the transmission threshold, the Lora is lossy in every terminal communication in the hospital, where the fit loss model is:
L＝69.55+26.16lgf c -13.82lgh t -a(h r )+(44.9-6.55lgh t )lgd≤L 0
wherein f c For the Lora working frequency, h t To transmit height, h r For the second department to transmit distance L 0 Is the path loss threshold.
Preferably, for step S2, the encryption algorithm comprises the steps of:
s11, in the encryption stage, firstly, reading the ID of a special medical material from an RFID tag on a package, encrypting the medical material ID by using an encryption function to generate CID, and then writing the material ID and an authentication code into a system memory and locking the memory;
s12, authentication is carried out subsequently, a department unit applies for communication through the Lora node, and an RFID terminal is utilized to read the ID and the authentication code CID of the special medical product from the RFID tag;
s13, finally, the CID is decrypted by utilizing the decryption function, and a PID code is generated for decryption.
Preferably, for step S2, the backoff mechanism of the NBLOT system comprises the steps of:
s21, initializing all nodes by a hospital logistics terminal, and establishing an RTT mapping table of each of the Lora nodes of each department so that the nodes are in an idle state;
s22, a hospital logistics terminal sends a node sending request, sends an RTS (request to send) packet to a department target node, carries a source ID (identity) and a destination ID (identity), and additionally sends the number of data packets, and if the department does not receive an expected CTS (clear to send) packet within a specified time, communication is stopped;
s23, if both sides receive the returned CTS packet, entering a data formal receiving and transmitting stage, continuously updating the transmission delay RTT of the destination end by each Lora node, and loading the delay update of the logistics information into the RTS packet and the CTS packet.
Preferably, the gateway deployment of the mixed network system finds a minimum gateway set and a coverage node according to different department demands of the same-frequency node and the different-frequency node.
Preferably, the minimum gateway set and the number of overlay nodes areAnd needs to satisfy the constraint:
wherein u represents the number of same-frequency nodes, w represents the number of different-frequency nodes, and L * The number of the gateways is optimized for the layer, and L is the number of the gateways optimized for the upper layer.
Preferably, for step S21, the Lora node RA preamble of each department starts up the NBLOT termination node, and department coverage class is divided into three classes of normal coverage, enhanced coverage and limit coverage, corresponding to three classes of MCL 144dB, 154dB, 164dB.
Preferably, for step S21, after the single node of each department successfully transmits a single data packet, the channel is released, when all the nodes in the department have new data packets generated, the queue is not emptied, and the nodes in the department in the last time start RA again.
In conclusion, the cloud supply chain system is compared with an old system, the problem of data encryption is solved, the privacy of medical logistics is protected, the problems of delay of the Internet of things and system performance reduction of Lora low power consumption when a large number of nodes are concurrent are solved, and the problem that the throughput of RFID communication cannot be expressed uniformly is finally solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is an overall system diagram of the present application;
FIG. 2 is a diagram of a communication interface module according to the present application;
FIG. 3 is a flow chart illustrating the operation of the system of the present application;
fig. 4 is a diagram of a medical material management system according to the present application.
Detailed Description
The following detailed description of embodiments of the present application will be given with reference to the accompanying drawings and examples, by which the implementation process of how the present application can be applied to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Referring to fig. 1-4, referring to fig. 1, a hospital builds a multi-channel communication node based on an NB-LOT internet of things module, the hospital builds a multi-channel communication node by using a Lora protocol, wherein a terminal node starts and initiates a competition channel demand through an ALOHA protocol, a star topology network is built by a communication architecture of the inside of the hospital, a communication system between an internal logistics terminal and each department is built, the NBLOT system analyzes a backoff mechanism, builds the number of times of re-penetration and the length of a buffer zone under a single terminal, then solves the steady-state distribution throughput of the hospital warehouse, allocates an RFID tag according to the throughput, allocates an RFID tag to the medical product, adds a new responsibility partition after the hospital logistics material enters the medical product management system, a system manager reasonably stores a secret key by combining the coding real requirement of the medical material, embeds the public key in a PDA (personal digital assistant) for the special medical material, encrypts an ID (ID) of the special material by using the special physical material and generates an authentication SID, performs the ID (ID) encapsulation, then allocates the special physical material ID and the PDA (personal digital assistant) and reads the SID tag, and then takes out the SID tag from the PDA (personal digital assistant) after the ID) and the digital assistant (personal digital assistant) reads the SID tag.
In order to solve the problems of data encryption and decryption, in the encryption stage, firstly, the ID of a special medical material is read from an RFID tag on a package, the medical material ID is encrypted by using an encryption function, CID is generated, then the material ID and an authentication code are written into a system memory and then the memory is locked, then authentication is carried out, a department unit applies for communication through a Lora node, the ID and the authentication code CID of the special medical product are read from the RFID tag by utilizing an RFID terminal, and finally, the CID is decrypted by utilizing a decryption function and a PID code is generated for decryption.
In order to reduce the encryption and decryption time, the encryption process is divided into online and offline parts. In the off-line phase, the encryption operation of the body portion is performed. And in the online stage, continuing the encryption operation by using the intermediate ciphertext and the round key obtained by offline encryption.
In order to solve the problems of delay of the Internet of things and system performance degradation of Lora low power consumption when a large number of nodes are concurrent, a gateway deployment of a mixed network system finds a minimum gateway set and a minimum gateway coverage node according to different department demands of the same-frequency node and different-frequency node, a hospital logistics terminal initializes all nodes, each department Lora node establishes an RTT mapping table of each of the nodes so that the nodes are in an idle state, the hospital logistics terminal sends a node sending request, sends an RTS packet to a department target node, carries a source ID and a destination ID, additionally sends the number of data packets, if the departments do not receive an expected CTS packet within a specified time, communication is stopped, if the departments receive the corresponding CTS packet, the two parties enter a data formal receiving and transmitting phase and each Lora node continuously updates transmission delay RTT of the destination end, and delay updating of logistics information is loaded into the RTS packet and the CTS packet.
In order to calculate the minimum gateway and solve the gateway midway problem, a constraint condition is established:
wherein u represents the number of same-frequency nodes, w represents the number of different-frequency nodes, and L * Optimizing the number of gateways for the layer, wherein L is the number of gateways for the upper layer, and at least one of the gateways is calculated in the first roundThe individual terminal nodes are covered, leaving +.>And each terminal node.
Then, continuing the iteration constraint condition, and at least after two roundsThe terminal nodes are covered, and after L rounds of operation, the terminal nodes in the left department are not covered.
In order to optimize the throughput and efficiency of the system, in the Lora network, each time data transmission is performed, the terminal performs control of the transmission power and the channel model, and then performs calculation of the optimal transmission rate.
In order to solve the problem of packet loss of system transmission, a back-off mechanism is introduced, wherein when NBLOT of two or more department terminals initiate requests, RA processes are started simultaneously, the same resources and the same back-off parameters are selected, channels collide, the conflicting NBLOT nodes restart RA after waiting for a period, back-off waiting time is selected, and competition is conducted again when the channels are idle and then data are transmitted.
Wherein the channel contention probability is:
n is the competition number, P is the probability of successful data packet transmission, N is the number of cache nodes, and the terminal feeds back the calculated channel competition probability to each department for waiting.
Referring to fig. 2, the hybrid network system includes an X-type gateway, a Y-type gateway, a same-frequency node and an inter-frequency node, where the X-type gateway and the same-frequency node and the inter-frequency node are connected by an uplink channel or a downlink channel, and the Y-type gateway and the same-frequency node and the inter-frequency node are also connected by an uplink channel or a downlink channel, and the X-type gateway and the Y-type gateway are deployed in half duplex symmetry; the NBLOT system comprises a plurality of Lora communication modules and terminal receiving modules, the PHY of each Lora communication module is a linear spread spectrum code, and the MAC layer of the terminal receiving module is a LoRaWAN protocol management node; the medical material management system comprises record management, label management, traceability management and traceability statistics, wherein the record management comprises medical material allocation RFID labels, sent logistics and statistics labels.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the application are intended to be within the scope of the appended claims.
Claims (9)
1. A hospital supplies fine management system based on RFID and multiterminal communication comprises an NBLOT system, a medical supplies management system and a frequency mixing network system; the method is characterized in that: the frequency mixing network system comprises an X-type gateway, a Y-type gateway, a same-frequency node and an inter-frequency node, wherein the X-type gateway and the same-frequency node and the inter-frequency node can be connected through an uplink channel or a downlink channel, the Y-type gateway and the same-frequency node and the inter-frequency node can be connected through an uplink channel or a downlink channel, and the X-type gateway and the Y-type gateway are symmetrically deployed in a half duplex mode;
the NBLOT system comprises a plurality of Lora communication modules and terminal receiving modules, the PHY of each Lora communication module is linear spread spectrum coding, and the MAC layer of each terminal receiving module is a LoRaWAN protocol management node;
the medical material management system comprises record management, label management, traceability management and traceability statistics, wherein the record management comprises medical material allocation RFID labels, sending logistics and statistics labels;
the management system comprises the following steps: s1, firstly, constructing an NB LOT-based internet of things module by a hospital, and constructing a multi-channel communication node by utilizing Lora, wherein a terminal node starts and initiates a competition channel demand through an ALOHA protocol, constructing a star topology network by a Lora network communication architecture in the hospital, and constructing a communication system between an internal logistics terminal and each department; s2, the NBLOT system analyzes a back-off mechanism, builds the number of times of re-penetration and the length of a buffer zone under a single terminal, and then solves the steady-state distribution throughput of a hospital warehouse; s3, distributing the RFID tags of the medical products according to the throughput, and distributing the RFID tags by workers in a medical material management system; s4, after the physical distribution materials of the hospital enter, a new responsibility partition is added, a system administrator stores a secret key by managing the physical distribution materials and combining with the coding real requirement of the physical distribution materials, and a public key is built in a PDA (personal digital assistant) for special label management for special physical distribution materials; s5, using the PDA to encrypt the ID of the special medical supplies and generate an authentication code SID, packaging the special medical supplies, then combining the supply ID and the encrypted authentication code SID into an RFID tag, entering a warehouse, using the PDA terminal to read the special medical supplies ID and SID by a department, and then taking out the supplies.
2. The hospital supplies refinement management system based on RFID and multiport communication as claimed in claim 1, wherein: the use frequency points of the uplink channel or the downlink channel of the X-type gateway and the Y-type gateway are different, and the uplink frequency and the downlink frequency are different.
3. The hospital supplies refinement management system based on RFID and multiport communication as claimed in claim 1, wherein: aiming at the step S1, lora gateway parameters are deployed between each department in a hospital, and the transmitting frequency of each department gateway is at least 17dBm, wherein the edge transmission rate of communication between Lora terminal nodes between each department is as follows:
wherein BW is network bandwidth and Lora is lossy in every terminal communication in the hospital, wherein the fit loss model is:
L＝69.55+26.16lgf c -13.82lgh t -a(h r )+(44.9-6.55lgh t )lgd≤L 0
wherein f c For the Lora working frequency, h t To transmit height, h t For the second department to transmit distance L 0 Is the path loss threshold.
4. A hospital supplies refinement system based on RFID and multiport communication as defined in claim 3, wherein: for step S2, the encryption algorithm comprises the steps of: s11, in the encryption stage, firstly, reading the ID of a special medical material from an RFID tag on a package, encrypting the medical material ID by using an encryption function to generate CID, and then writing the material ID and an authentication code into a system memory and locking the memory; s12, authentication is carried out subsequently, a department unit applies for communication through the Lora node, and an RFID terminal is utilized to read the ID and the authentication code CID of the special medical product from the RFID tag; s13, finally, the CID is decrypted by utilizing the decryption function, and a PID code is generated for decryption.
5. A hospital supplies refinement system based on RFID and multiport communication as defined in claim 3, wherein: the backoff mechanism of the NBLOT system for step S2 comprises the steps of: s21, initializing all nodes by a hospital logistics terminal, and establishing an RTT mapping table of each of the Lora nodes of each department so that the nodes are in an idle state; s22, a hospital logistics terminal sends a node sending request, sends an RTS (request to send) packet to a department target node, carries a source ID (identity) and a destination ID (identity), and additionally sends the number of data packets, and if the department does not receive an expected CTS (clear to send) packet within a specified time, communication is stopped; s23, if both sides receive the returned CTS packet, entering a data formal receiving and transmitting stage, continuously updating the transmission delay RTT of the destination end by each Lora node, and loading the delay update of the logistics information into the RTS packet and the CTS packet.
6. The hospital supplies refinement management system based on RFID and multiport communication as claimed in claim 1, wherein: and the gateway deployment of the mixing network system finds out a minimum gateway set and a coverage node according to different department demands of the same-frequency node and the different-frequency node.
7. The hospital supplies refinement management system based on RFID and multiport communication in claim 6, wherein: the minimum gateway set and the number of overlay nodes areAnd needs to satisfy the constraint:
wherein u represents the number of same-frequency nodes, w represents the number of different-frequency nodes, and L * The number of the gateways is optimized for the layer, and L is the number of the gateways optimized for the upper layer.
8. The hospital supplies refinement management system based on RFID and multiport communication according to claim 5, wherein: for step S21, the Lora node RA preamble of each department starts an NBLOT terminal node, and department coverage and the like are divided into three levels of normal coverage, enhanced coverage and limit coverage, and the corresponding three levels of MCL are 144dB, 154dB and 164dB.
9. The hospital supplies refinement management system based on RFID and multiport communication according to claim 5, wherein: for step S21, after the single node of each department successfully transmits a single data packet, the channel is released, when all the idle nodes of the department have new data packets to generate, the queue is not empty, and the nodes of the last department start RA again.
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