Emergency communication nursing talkback information system based on Bluetooth technology

Abstract

The invention discloses an emergency communication nursing talkback information system based on a Bluetooth technology. The emergency communication nursing talkback information system comprises an initialization module, a Bluetooth relay node selection module, a route optimization module, a data aggregation module, a cluster head node number optimization module and an emergency information transmission module. The invention belongs to the technical field of wireless communication, and particularly relates to an emergency communication nursing talkback information system based on a Bluetooth technology, which adopts dynamic Bluetooth relay node election, realizes balanced consumption of energy and prolongs the overall service life of a network; the data aggregation module is used for effectively reducing transmission bandwidth occupation; the number of cluster heads is dynamically adjusted through a cluster head number optimization module, and reasonable cluster head distribution is achieved; a load factor is added into the Bluetooth relay node election module, so that balanced distribution of network loads is realized, and the stability and cruising ability of the system are improved; a dynamic priority scheduling mechanism is introduced, the priority of information transmission is dynamically adjusted according to the emergency level of the emergency event, and rapid transmission of emergency information is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of wireless communications, and in particular to an emergency communication nursing intercom information system using Bluetooth technology. Background Art

[0002] The emergency communication nursing intercom information system is a specially designed wireless communication system for hospitals, nursing homes and other places. It is used to provide real-time two-way communication in emergency situations so that nursing staff can receive emergency alerts from patients or medical equipment in a timely manner and take quick action. The system monitors the patient's health data, identifies emergency events and ensures that nursing staff can communicate with patients and provide assistance in real time. However, the general emergency communication nursing intercom information system cannot effectively balance energy consumption, resulting in shortened network life, unnecessary bandwidth occupation, affecting the transmission speed of key data, and causing data redundancy and bandwidth occupation; the general emergency communication nursing intercom information system has problems such as uneven energy utilization, delayed emergency information transmission, and uneven equipment load; the general emergency communication nursing intercom information system has problems such as the system will not work when there is a problem with the network and the line is blocked. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an emergency communication nursing intercom information system using Bluetooth technology. In view of the problem that the general emergency communication nursing intercom information system will not work when there is a problem with the network or the line is blocked, this solution ensures high-speed and stable communication through a dual communication network design of wired Ethernet + Bluetooth network, and ensures the accuracy of device connection and the simplicity of management through a distributed Bluetooth network, initial state detection and automatic configuration. When the network is normal, the system uses the wired network for efficient management; when the network is interrupted, the device switches to Bluetooth communication to ensure uninterrupted communication; in view of the problem that the general emergency communication nursing intercom information system cannot effectively balance energy consumption, resulting in a shortened network life, unnecessary bandwidth occupancy, affecting the transmission speed of key data, and causing data redundancy and bandwidth occupancy, this solution adopts dynamic Bluetooth relay node election, and dynamically adjusts the election strategy of the relay node according to the remaining energy of the device, the historical energy consumption rate and the current load, thereby achieving balanced energy consumption and extending the overall life of the network; the data aggregation module reduces the transmission of duplicate information, and adopts data compression The compression factor optimizes the amount of transmitted data, effectively reduces the transmission bandwidth occupancy, improves transmission efficiency, and reduces the energy consumption of the system; in view of the problems of uneven energy utilization, emergency information transmission delay, and unbalanced equipment load in general emergency communication nursing intercom information systems, this solution dynamically adjusts the number of cluster heads through the cluster head number optimization module, combines the free space transmission model and the multipath fading model to ensure the minimization of energy consumption and achieve a reasonable distribution of cluster heads; adds a load factor to the Bluetooth relay node election module, evaluates the current load of the node in real time, and dynamically adjusts the election probability of the cluster head and relay node, achieving a balanced distribution of network load and improving the stability and endurance of the system; introduces a dynamic priority scheduling mechanism to dynamically adjust the priority of information transmission according to the urgency level of the emergency event, thereby achieving rapid transmission of emergency information.

[0004] The technical solution adopted by the present invention is as follows: the present invention provides an emergency communication nursing intercom information system using Bluetooth technology, including an initialization module, a Bluetooth relay node selection module, a routing optimization module, a data aggregation module, a cluster head node quantity optimization module and an emergency information transmission module;

[0005] The initialization module deploys a Bluetooth network and a nursing intercom unit covering the nursing area;

[0006] The Bluetooth relay node selection module dynamically adjusts the selection of the Bluetooth relay node by dynamically adjusting the selection probability of the Bluetooth relay node;

[0007] The routing optimization module is responsible for transmitting data from the Bluetooth relay node to the nursing station through the optimal path;

[0008] The data aggregation module is responsible for aggregating data from multiple Bluetooth devices by the cluster head node;

[0009] The cluster head number optimization module dynamically adjusts the number of cluster heads in the network;

[0010] The emergency information transmission module is used to detect the patient's emergency situation and immediately transmit the emergency information to the nursing station through the Bluetooth relay node.

[0011] Furthermore, the initialization module is that the patient wears a Bluetooth sensor device, the nursing staff carries a Bluetooth intercom terminal, and the Bluetooth devices are installed and distributed as key nodes to form a Bluetooth network; the nursing area is divided based on the hospital layout, and the initial energy and position of all Bluetooth devices are recorded in the system; the nursing intercom unit includes the nursing intercom host of the nursing station, namely the Bluetooth intercom terminal, the ward door machine at the door of the ward, the bedside extension at the bedside of the ward, and the management server.

[0012] Furthermore, the Bluetooth relay node selection module is a system that dynamically adjusts the selection probability of Bluetooth relay nodes to extend the network life and improve energy utilization efficiency. The Bluetooth device is used as a node. The Bluetooth relay node selection probability formula is based on the residual energy of the device. The probability threshold of the Bluetooth device becoming a Bluetooth relay node is calculated in each round, which is expressed as: ; Each node generates a random number. If the random number is less than the probability threshold, the node becomes the Bluetooth relay node of the current round and is responsible for collecting data from other devices in the area; Among them, ; T(s i ) is the node s i The probability threshold of becoming a Bluetooth relay node; p i It is node s i Basic Bluetooth relay node selection probability; r is the current round; E res is the current remaining energy of the node; E init is the initial energy of the node; h i It is node s i The historical energy consumption rate; It is node s i In the past time Energy consumed internally; L i It is node s i The current load; d i It is node s i The distance between the node and the cluster head.

[0013] Furthermore, the routing optimization module is a Bluetooth relay node responsible for collecting data from patient devices and transmitting the data to the nursing station through the optimal path; the Bluetooth relay node transmits data through the Mesh network to form a multi-hop communication path to ensure efficient data transmission in the hospital environment; when the Bluetooth device transmits data to the Bluetooth relay node, the energy consumption model is expressed as ; The energy consumption of the Bluetooth relay node when transmitting data to the nursing station is expressed as: ; Dynamic path selection is expressed as: ; Among them, E tx (k,d) is the node s i Energy consumption of transmitting k bits of data to the relay node; E elec is the energy consumed per bit of the transmission circuit; E fs is the energy consumption coefficient in the free space transmission model, which is a model used to calculate the loss of wireless signals when propagating in free space; d is the distance between the node and the Bluetooth relay node; E CH (k, d) is the energy consumption of the Bluetooth relay node to transmit k bits of data to the nursing station; E amp is the amplifier energy consumption coefficient during long-distance transmission; P ot is the optimal path selection; P is the path; the distance is determined based on the pre-selected distance threshold; D Q is the link quality factor, , α and β are weight parameters, Rt is the current signal strength between nodes, Re is the signal strength baseline, SR is the actual transmission success rate between nodes, and ER is the expected transmission success rate.

[0014] Furthermore, the data aggregation module is a cluster head node responsible for aggregating data from different Bluetooth devices, reducing the transmission of duplicate information and optimizing system energy utilization; the energy consumption of the cluster head node when aggregating data is expressed as ; Among them, E DA is the energy consumption of the cluster head node when performing data aggregation; E elec is the energy consumption per bit of the transmission circuit; Cf is the data compression factor; E agg is the energy consumption per bit of the aggregation operation.

[0015] Furthermore, the cluster head node number optimization module is a system that optimizes the number of cluster head nodes to ensure that energy consumption is minimized while maintaining efficient data transmission. The system dynamically adjusts the number of cluster head nodes in each round; the optimal cluster head node number calculation formula is expressed as: ; where k ot is the optimal number of cluster head nodes; N is the total number of Bluetooth devices; E ms is the energy consumption coefficient in the Rayleigh fading model; M is the coverage area of ​​the nursing area; dtoBS is the average distance from the cluster head node to the nursing station; B i is the node balance factor within the cluster.

[0016] Furthermore, the emergency information transmission module is that when the patient's Bluetooth device detects an emergency, the Bluetooth relay node immediately transmits the data to the nursing station to achieve a quick response; the nursing staff's Bluetooth terminal device establishes a two-way intercom channel with the patient's device to ensure instant communication in an emergency; a high priority is set for emergency information transmission, and the emergency priority scheduling formula is expressed as: ; Among them, P emy is the priority dispatch value of emergency information; U is the level of emergency, which is defined as extreme emergency, moderate emergency and low emergency. The emergency level is obtained through heart rate monitoring; L net is the network load factor, indicating the current network congestion status, , CL is the current load in the network, and ML is the maximum load that the system can support.

[0017] The beneficial effects achieved by the present invention using the above scheme are as follows:

[0018] (1) In view of the problem that the general emergency communication nursing intercom information system will not work when there is a problem with the network or the line is blocked, this solution ensures high-speed and stable communication through a dual communication network design of wired Ethernet + Bluetooth network. Through distributed Bluetooth network, initial status detection and automatic configuration, the accuracy of device connection and the ease of management are ensured. When the network is normal, the system uses the wired network for efficient management; when the network is interrupted, the device switches to Bluetooth communication to ensure uninterrupted communication.

[0019] (2) In view of the problem that general emergency communication nursing intercom information systems cannot effectively balance energy consumption, resulting in shortened network life, unnecessary bandwidth occupation, affecting the transmission speed of key data, and causing data redundancy and bandwidth occupation, this solution adopts dynamic Bluetooth relay node election to dynamically adjust the relay node election strategy according to the remaining energy of the device, historical energy consumption rate and current load, thereby achieving balanced energy consumption and extending the overall life of the network; the data aggregation module reduces the transmission of duplicate information and uses data compression factors to optimize the amount of transmitted data, effectively reducing the transmission bandwidth occupation, improving transmission efficiency, and reducing the energy consumption of the system.

[0020] (3) In view of the problems of uneven energy utilization, delayed emergency information transmission, and uneven equipment load in general emergency communication nursing intercom information systems, this solution dynamically adjusts the number of cluster heads through the cluster head number optimization module, combines the free space transmission model and the multipath fading model to ensure the minimization of energy consumption and achieve a reasonable cluster head distribution; adds a load factor to the Bluetooth relay node election module to evaluate the current load of the node in real time, dynamically adjusts the election probability of the cluster head and relay node, achieves a balanced distribution of network load, and improves the stability and endurance of the system; introduces a dynamic priority scheduling mechanism to dynamically adjust the priority of information transmission according to the urgency level of the emergency event, and achieves rapid transmission of emergency information. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a flow chart of an emergency communication nursing intercom information system using Bluetooth technology provided by the present invention.

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0025] Example 1, see Figure 1 , the present invention provides an emergency communication nursing intercom information system using Bluetooth technology, including an initialization module, a Bluetooth relay node selection module, a routing optimization module, a data aggregation module, a cluster head node quantity optimization module and an emergency information transmission module;

[0026] The initialization module deploys a Bluetooth network and a nursing intercom unit covering the nursing area; and sends data to the Bluetooth relay node selection module;

[0027] The Bluetooth relay node selection module receives data sent by the initialization module; dynamically adjusts the selection of the Bluetooth relay node by dynamically adjusting the selection probability of the Bluetooth relay node; and sends the data to the routing optimization module;

[0028] The routing optimization module receives data sent by the Bluetooth relay node selection module; is responsible for transmitting data from the Bluetooth relay node to the nursing station through the optimal path; and sends the data to the data aggregation module;

[0029] The data aggregation module receives the data sent by the routing optimization module; dynamically adjusts the number of cluster heads in the network; and sends the data to the emergency information transmission module data;

[0030] The emergency information transmission module receives data sent by the aggregation module; detects the patient's emergency situation and immediately transmits the emergency information to the nursing station via the Bluetooth relay node.

[0031] Example 2, see Figure 1 This embodiment is based on the above embodiment. The initialization module is that the patient wears a Bluetooth sensor device, the nursing staff carries a Bluetooth intercom terminal, and the Bluetooth devices are installed and distributed as key nodes to form a Bluetooth network; the nursing area is divided based on the hospital layout, and the initial energy and position of all Bluetooth devices are recorded in the system; the nursing intercom unit includes the nursing intercom host of the nursing station, that is, the Bluetooth intercom terminal, the ward door machine at the door of the ward, the bedside extension at the head of the ward bed, and the management server. Each device of the nursing intercom unit includes a main control chip, an Ethernet communication module, an audio processing module and a Bluetooth device; the operations performed before the system runs include: Ethernet connection detection: the extension and the door machine detect whether there is a wired Ethernet connection; server communication detection, the extension and the door machine detect whether they can communicate with the management server; host and server communication detection: the management server detects whether it can communicate with the nursing host; obtain the host IP address: the extension and the door machine Get the IP address of the nursing host from the management server; Get the IP addresses of the extension and outdoor station: The nursing host gets the IP addresses of the extension and outdoor station from the management server; Wired Ethernet communication: The host, outdoor station and extension communicate via wired Ethernet; Bluetooth module name setting: If there is no connection in the connection detection or communication detection, all devices set the Bluetooth module name through the main control chip. Specifically, the Bluetooth module name of the host contains the device name + device number, and the Bluetooth module name of the extension and outdoor station contains the device name + ward number + device number; Extension Bluetooth search: The extension searches for Bluetooth devices and connects to the Bluetooth device whose ward number in the Bluetooth module name is consistent with the ward number set by the extension; Outdoor station Bluetooth search: The outdoor station searches for Bluetooth devices and connects to the device whose device name in the Bluetooth module name is "host" and whose device number is consistent with the set host number; Bluetooth communication: The extension, outdoor station and host communicate via Bluetooth.

[0032] By performing the above operations, the general emergency communication nursing intercom information system will not work when there is a problem with the network or the line is blocked. This solution ensures high-speed and stable communication through a dual communication network design of wired Ethernet + Bluetooth network. The distributed Bluetooth network, initial status detection and automatic configuration ensure the accuracy of device connection and the ease of management. When the network is normal, the system uses the wired network for efficient management; when the network is interrupted, the device switches to Bluetooth communication to ensure uninterrupted communication.

[0033] Example 3, see Figure 1 ,This embodiment is based on the above embodiment. The Bluetooth relay node selection module is a system that dynamically adjusts the selection probability of Bluetooth relay nodes to extend the network life and improve energy utilization efficiency. The Bluetooth device is used as a node. The Bluetooth relay node selection probability formula is based on the residual energy of the device. The probability threshold of the Bluetooth device becoming a Bluetooth relay node is calculated in each round, which is expressed as: ; Each node generates a random number. If the random number is less than the probability threshold, the node becomes the Bluetooth relay node of the current round and is responsible for collecting data from other devices in the area; Among them, ; T(s i ) is the node s i The probability threshold of becoming a Bluetooth relay node; p i It is node s i Basic Bluetooth relay node selection probability; r is the current round; E res is the current remaining energy of the node; E init is the initial energy of the node; h i It is node s i The historical energy consumption rate; It is node s i In the past time Energy consumed internally; L i It is node s i The current load; d i It is node s i The distance between the node and the cluster head.

[0034] Example 4, see Figure 1 , this embodiment is based on the above embodiment. The routing optimization module is a Bluetooth relay node responsible for collecting data from patient devices and transmitting the data to the nursing station through the optimal path; the Bluetooth relay node transmits data through the Mesh network to form a multi-hop communication path to ensure efficient data transmission in the hospital environment; when the Bluetooth device transmits data to the Bluetooth relay node, the energy consumption model is expressed as ; The energy consumption of the Bluetooth relay node when transmitting data to the nursing station is expressed as: ; Dynamic path selection is expressed as: ; Among them, E tx (k,d) is the node s i Energy consumption of transmitting k bits of data to the relay node; E elec is the energy consumed per bit of the transmission circuit; E fs is the energy consumption coefficient in the free space transmission model, which is a model used to calculate the loss of wireless signals when propagating in free space; d is the distance between the node and the Bluetooth relay node; E CH (k, d) is the energy consumption of the Bluetooth relay node to transmit k bits of data to the nursing station; E amp is the amplifier energy consumption coefficient during long-distance transmission; P ot is the optimal path selection; P is the path; the distance is determined based on the pre-selected distance threshold; D Q is the link quality factor, , α and β are weight parameters, Rt is the current signal strength between nodes, Re is the signal strength baseline, SR is the actual transmission success rate between nodes, and ER is the expected transmission success rate.

[0035] Example 5, see Figure 1 This embodiment is based on the above embodiment. The data aggregation module is a cluster head node responsible for aggregating data from different Bluetooth devices. The energy consumption of the cluster head node when aggregating data is expressed as ; Among them, E DA is the energy consumption of the cluster head node when performing data aggregation; E elec is the energy consumption per bit of the transmission circuit; Cf is the data compression factor; E agg is the energy consumption per bit of the aggregation operation.

[0036] By performing the above operations, the general emergency communication nursing intercom information system cannot effectively balance energy consumption, resulting in shortened network life, unnecessary bandwidth occupation, affecting the transmission speed of key data, and causing data redundancy and bandwidth occupation. This solution adopts dynamic Bluetooth relay node election to dynamically adjust the relay node election strategy according to the remaining energy, historical energy consumption rate and current load of the device, thereby achieving balanced energy consumption and extending the overall life of the network; the data aggregation module reduces the transmission of duplicate information, uses data compression factors to optimize the amount of transmitted data, effectively reduces transmission bandwidth occupation, improves transmission efficiency, and reduces the energy consumption of the system.

[0037] Example 6, see Figure 1 This embodiment is based on the above embodiment. The cluster head node number optimization module is a system that optimizes the number of cluster head nodes. The system dynamically adjusts the number of cluster head nodes in each round. The optimal cluster head node number calculation formula is expressed as: ; where k ot is the optimal number of cluster head nodes; N is the total number of Bluetooth devices; E ms is the energy consumption coefficient in the Rayleigh fading model; M is the coverage area of ​​the nursing area; d toBS is the average distance from the cluster head node to the nursing station; B i is the node balance factor within the cluster.

[0038] Embodiment 7, see Figure 1 This embodiment is based on the above embodiment. The emergency information transmission module is that when the patient's Bluetooth device detects an emergency, the Bluetooth relay node immediately transmits the data to the nursing station to achieve a quick response; the nursing staff's Bluetooth terminal device establishes a two-way intercom channel with the patient's device to ensure instant communication in an emergency; a high priority is set for emergency information transmission, and the emergency priority scheduling formula is expressed as: ; Among them, P emy is the priority dispatch value of emergency information; U is the level of emergency, which is defined as extreme emergency, moderate emergency and low emergency. The emergency level is obtained through heart rate monitoring; L net is the network load factor, indicating the current network congestion status, , CL is the current load in the network, and ML is the maximum load that the system can support.

[0039] By performing the above operations, in view of the problems of uneven energy utilization, delayed emergency information transmission, and uneven equipment load in general emergency communication nursing intercom information systems, this solution dynamically adjusts the number of cluster heads through the cluster head number optimization module, combines the free space transmission model and the multipath fading model to ensure the minimization of energy consumption and achieve a reasonable distribution of cluster heads; adds a load factor to the Bluetooth relay node election module, evaluates the current load of the node in real time, and dynamically adjusts the election probability of the cluster head and relay node, achieving a balanced distribution of network load and improving the stability and endurance of the system; introduces a dynamic priority scheduling mechanism to dynamically adjust the priority of information transmission according to the urgency level of the emergency event, thereby achieving rapid transmission of emergency information.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0042] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An emergency communication nursing intercom information system based on Bluetooth technology, characterized by: The system includes an initialization module, a Bluetooth relay node selection module, a routing optimization module, a data aggregation module, a cluster head node quantity optimization module and an emergency information transmission module; The initialization module deploys a Bluetooth network and a nursing intercom unit covering the nursing area; The Bluetooth relay node selection module dynamically adjusts the selection of the Bluetooth relay node by dynamically adjusting the selection probability of the Bluetooth relay node; The routing optimization module is responsible for transmitting data from the Bluetooth relay node to the nursing station through the optimal path; The data aggregation module is responsible for aggregating data from multiple Bluetooth devices by the cluster head node; The cluster head number optimization module dynamically adjusts the number of cluster heads in the network; The emergency information transmission module is used to detect the patient's emergency situation and immediately transmit the emergency information to the nursing station through the Bluetooth relay node.

2. According to the Bluetooth technology emergency communication nursing intercom information system of claim 1, it is characterized by: The Bluetooth relay node selection module is a system that dynamically adjusts the selection probability of Bluetooth relay nodes to extend the network life and improve energy utilization efficiency. The Bluetooth device is used as a node. The Bluetooth relay node selection probability formula is based on the residual energy of the device. The probability threshold of the Bluetooth device becoming a Bluetooth relay node is calculated in each round, which is expressed as: ; Each node generates a random number. If the random number is less than the probability threshold, the node becomes the Bluetooth relay node of the current round and is responsible for collecting data from other devices in the area; Among them, ; T(s i ) is the node s i The probability threshold of becoming a Bluetooth relay node; p i It is node s i Basic Bluetooth relay node selection probability; r is the current round; E res is the current remaining energy of the node; E init is the initial energy of the node; h i It is node s i The historical energy consumption rate; is the node s i In the past time Energy consumed internally; L i is the node s i The current load; d i It is node s i The distance from the cluster head node.

3. According to the Bluetooth technology emergency communication nursing intercom information system of claim 1, it is characterized by: The routing optimization module is a Bluetooth relay node responsible for collecting data from patient devices and transmitting the data to the nursing station through the optimal path; the Bluetooth relay node transmits data through the Mesh network to form a multi-hop communication path to ensure efficient data transmission in the hospital environment; when the Bluetooth device transmits data to the Bluetooth relay node, the energy consumption model is expressed as ; The energy consumption of the Bluetooth relay node when transmitting data to the nursing station is expressed as: ; Dynamic path selection is expressed as: ; Among them, E tx (k,d) is the node s i Energy consumption of transmitting k bits of data to the relay node; E elec is the energy consumed per bit of the transmission circuit; E fs is the energy consumption coefficient in the free space transmission model, which is a model used to calculate the loss of wireless signals when propagating in free space; d is the distance between the node and the Bluetooth relay node; E CH (k, d) is the energy consumption of the Bluetooth relay node to transmit k bits of data to the nursing station; E amp is the amplifier energy consumption coefficient during long-distance transmission; P ot is the optimal path selection; P is the path; the distance is determined based on the pre-selected distance threshold; D Q is the link quality factor, , α and β are weight parameters, Rt is the current signal strength between nodes, Re is the signal strength baseline, SR is the actual transmission success rate between nodes, and ER is the expected transmission success rate.

4. According to the Bluetooth technology emergency communication nursing intercom information system of claim 1, it is characterized by: The cluster head node number optimization module is a system that optimizes the number of cluster head nodes. In each round, the system dynamically adjusts the number of cluster head nodes. The optimal cluster head node number calculation formula is expressed as: ; where k ot is the optimal number of cluster head nodes; N is the total number of Bluetooth devices; E ms is the energy consumption coefficient in the Rayleigh fading model; M is the coverage area of ​​the nursing area; d toBS is the average distance from the cluster head node to the nursing station; B i is the node balance factor within the cluster.

5. According to the Bluetooth technology emergency communication nursing intercom information system of claim 1, it is characterized by: The data aggregation module is a cluster head node responsible for aggregating data from different Bluetooth devices; the energy consumption of the cluster head node when aggregating data is expressed as ; Among them, E DA is the energy consumption of the cluster head node when performing data aggregation; E elec is the energy consumption per bit of the transmission circuit; Cf is the data compression factor; E agg is the energy consumption per bit of the aggregation operation.

6. The emergency communication nursing intercom information system based on Bluetooth technology according to claim 1 is characterized by: The emergency information transmission module is that when the patient's Bluetooth device detects an emergency, the Bluetooth relay node immediately transmits the data to the nursing station to achieve a quick response; the nursing staff's Bluetooth terminal device establishes a two-way intercom channel with the patient's device to ensure instant communication in an emergency; a high priority is set for emergency information transmission, and the emergency priority scheduling formula is expressed as: ; Among them, P emy is the priority dispatch value of emergency information; U is the level of emergency, which is defined as extreme emergency, moderate emergency and low emergency. The emergency level is obtained through heart rate monitoring; L net is the network load factor, indicating the current network congestion status, , CL is the current load in the network, and ML is the maximum load that the system can support.

7. The emergency communication nursing intercom information system based on Bluetooth technology according to claim 1 is characterized by: The initialization module is that the patient wears a Bluetooth sensor device, the nursing staff carries a Bluetooth intercom terminal, and the Bluetooth devices are installed and distributed as key nodes to form a Bluetooth network; the nursing area is divided based on the hospital layout, and the initial energy and position of all Bluetooth devices are recorded in the system; the nursing intercom unit includes the nursing intercom host of the nursing station, i.e. the Bluetooth intercom terminal, the ward door machine at the door of the ward, the bedside extension at the bedside of the ward, and the management server. Each device of the nursing intercom unit contains a main control chip, an Ethernet communication module, an audio processing module, and a Bluetooth device; The operations performed before the system is running include: Ethernet connection detection: extensions and door phones detect whether they are connected to wired Ethernet; server communication detection: extensions and door phones detect whether they can communicate with the management server; host and server communication detection: the management server detects whether it can communicate with the nursing host; obtain host IP address: extensions and door phones obtain the IP address of the nursing host from the management server; obtain extension and door phone IP addresses: the nursing host obtains the IP addresses of its extensions and door phones from the management server; wired Ethernet communication: the host, door phone, and extension communicate via wired Ethernet; Bluetooth module name setting: if If there is no connection in the connection detection or communication detection, all devices set the Bluetooth module name through the main control chip. Specifically, the Bluetooth module name of the host includes the device name + device number, and the Bluetooth module name of the extension and outdoor station includes the device name + ward number + device number; Extension Bluetooth search: The extension searches for Bluetooth devices and connects to the Bluetooth device whose ward number in the Bluetooth module name is consistent with the ward number set for the extension; Outdoor station Bluetooth search: The outdoor station searches for Bluetooth devices and connects to the device whose device name in the Bluetooth module name is "host" and whose device number is consistent with the set host number; Bluetooth communication: The extension, outdoor station and host communicate via Bluetooth.

Images