LDSW wireless calling system used in enterprise and public institution and working method of LDSW wireless calling system

Abstract

The invention provides an LDSW wireless calling system mainly used in enterprises and public institutions and a working method of the LDSW wireless calling system. The LDSW wireless calling system is an internal wireless calling system which is composed of a plurality of LDSW calling terminals and is dual-purpose for peacetime and urgency and low in cost. The LDSW calling terminal is long in standby working time, confidential in communication, long in communication distance, low in cost, capable of transmitting sensor and digital code information, capable of recording and tracing communication content and the like, and a manager of the internal wireless calling system can remotely control any calling terminal in the system through a calling center pager of the system. And when an emergency occurs, the system can be automatically connected with the existing local and national emergency communication network. The system not only can replace common interphones widely used in various scenes and building intercom systems using wired connection, but also can be used in application scenes with higher requirements, such as production management, public safety, emergency relief and the like.

Description

Technical Field

[0001] The present invention relates to digital communication technologies, and particularly to an LDSW wireless call system for use within enterprises, institutions, and organizations, and a working method thereof. Background Art

[0002] In enterprises, institutions, and industrial parks, using mobile phones for communication often brings many management and confidentiality problems. When using walkie-talkies, there are problems such as short standby time, the need for frequent charging, short communication distance, lack of communication confidentiality, inability to record and trace, and difficulty in holding people accountable in case of accidents; especially in case of emergencies, it is impossible to quickly notify everyone of the message. In addition, for property management and building communication in many communities, wired video intercom communication systems are often used, while for internal communication in most residential areas, a manual management method using telephone connections is completely adopted. The former system is complex, not only troublesome and costly to install and maintain, prone to failures, and has a limited service life, and cannot work at all when the network is disconnected or the power is cut off; the latter is not only inefficient, but also brings great inconvenience to both residents and the property management, not to mention the situation of being at a loss when the network is disconnected or the power is cut off.

[0003] Obviously, there is an urgent need in the market for a simple, easy-to-use, communication-confidential, and traceable low-cost internal wireless call system. Summary of the Invention

[0004] In view of this, in response to the above internal communication problems existing in general enterprises and institutions, the present invention provides a flat and emergency dual-use LDSW internal wireless call system composed of a number of LDSW call terminals operating according to LDSW low-power communication technology; here, LDSW is the abbreviation of Low Duty Cycle Smart wireless, representing low duty cycle wireless intelligent communication.

[0005] According to the first aspect of the embodiments of the present application, an LDSW wireless call system mainly for the interior of enterprises and institutions is provided. The system consists of an LDSW central call device and several LDSW call terminals that have the function of two-way wireless voice communication with the central call device and can be moved and carried around, and they all have a unique ID number; each call terminal and the central call device are each composed of a microphone for voice input, a small speaker for voice playback, a USB interface for charging the call terminal and data connection, a single-chip microcomputer that integrates voice sampling, AD conversion / voice compression, and DA conversion / voice decompression and then performs the function of voice playback, and a low-frequency low-rate wireless digital transceiver with radio frequency performance equivalent to that of a LORA low-frequency wireless transceiver; the single-chip microcomputer and the digital transceiver are independently configured or integrated into a multi-functional SOC chip; under the condition that the radio frequency working characteristics of the wireless transceiver are determined, the voice compression ratio adopted by the single-chip microcomputer not only satisfies the voice sampling rate in the range of 8 kHz - 16 kHz, but also satisfies the communication rate used by the low-frequency wireless digital transceiver in the range of 2 kbps - 8 kbps. Specifically, the size of the compression ratio adopted satisfies the balance requirement between the sound quality and the communication distance for specific applications; the call terminal usually adopts a periodic sleep state, and after waking up, it is in a low-power state of listening for digital wake-up signals sent by the central call device or other call terminals that initiate communication for a moment on a pre-set common signal monitoring channel; the central call device or call terminal that initiates communication will continuously and uninterruptedly repeat sending digital wake-up signals on the common radio frequency signal monitoring channel within a time period longer than the sleep wake-up cycle of the call terminal that receives the signal, seize the moment when the wireless digital signal transceiver of the call terminal that receives the signal wakes up and listens for the signal to establish a communication connection with it, and convey the next task to be done to it; when communicating between the central call device and the call terminal, their communication addresses are their respective ID numbers, and only the call terminals whose ID numbers belong to the same LDSW internal wireless call system have the function of wireless communication with the central call device or other call terminals; the central call device or call terminal can initiate point-to-point voice, digital text, or code communication with any other call terminal within the same communication system, or initiate point-to-multipoint broadcast voice, digital text, or code communication with other groups or all call terminals within the system; each call terminal has several control buttons that have the function of point-to-point communication or point-to-multipoint broadcast communication with the central call device or other call terminals. These buttons can be increased or decreased according to the actual application needs of the system, and at the same time, they also have the function of cooperating with a small display screen; the central call device manager wirelessly remotely loads the software in the call terminal according to the application needs of the system;Before entering the voice call communication, the calling terminal is an LDSW smart electronic tag that is in a periodic monitoring signal for a moment. It first needs to be awakened by the digital wake-up work instruction signal transmitted by the central caller or calling terminal that initiates the communication, and enters the working state of voice intercom according to the arrangement of the work instruction signal; and after both parties complete the voice intercom communication, it will return to the public signal monitoring channel and continue to monitor the new wake-up signal sent from the calling terminal that initiated the communication for a moment in a low-power state; the LDSW central caller is controlled and used by the administrator of this internal communication system, and it has the function of being given more functions and permissions. ;

[0006] Optionally, the digital wake-up signal that is continuously and repeatedly transmitted on the public signal monitoring channel by the central caller or calling terminal that initiates the communication includes at least the ID of the central caller or calling terminal that initiates the communication and the ID of the wake-up signal recipient, as well as work instruction information that the central caller or calling terminal that initiates the communication needs to convey to the signal recipient; the work instruction information includes at least whether the communicating parties need to jump to a new communication channel for wireless communication, whether the wireless communication needs to be carried out in a certain encryption method, and the wireless communication that the two parties are about to start, especially the time schedule for returning to the periodic sleep state after the voice intercom communication ends; when the central caller or calling terminal that initiates the communication initiates a point-to-multipoint wireless digital broadcast communication, the ID of the wake-up signal recipient is the group ID of all calling terminals that need to be awakened.

[0007] Optionally, in addition to initiating point-to-point or point-to-multipoint broadcast communications to the calling terminals in the system, the central caller also has some or all of the following functions: the function of selecting connections with different communication networks outside the system as needed, including connecting to the mobile network through the Cat1 module, connecting to the remote public communication network through the Beidou short message module or other satellite communication network ground terminals, and connecting to the remote public communication network through a low-frequency wireless data transmission radio station; the function of increasing the transmission power, receiving sensitivity, and antenna gain of its own wireless transceiver as needed to make the communication distance between it and other calling terminals in the system farther; the function of recording and storing communications with other calling terminals in the system; the function of increasing the number of its own wireless communication channels as needed, and arranging more communication methods with the calling terminals; the function of inputting and displaying text information; the function of managing and restricting the wireless communications between the calling terminals, including the function of prohibiting the calling terminals in the system from initiating point-to-point communications with any other calling terminals in the system; and the power supply guarantee required to meet some or all of the above functions.

[0008] Optionally, if the power supply conditions permit, the central pager will adopt the method of continuously monitoring signals. At this time, when the calling terminal initiating communication communicates with the central pager, the way of transmitting the wake-up work instruction signal will no longer adopt the way of continuously repeating transmission, but the way of transmitting a single wake-up work instruction signal packet.

[0009] Optionally, when the central pager has the condition of communicating with the calling terminal on multiple communication channels simultaneously, the central pager arranges them to communicate with the central pager on different communication channels according to the difference in the ID numbers of the calling terminals.

[0010] Optionally, the central pager receives wireless alarm information sent from other sensor terminals and automatically notifies the relevant calling terminals; the sensor terminals mentioned here refer to intelligent sensors that can directly perform wireless digital communication with the wireless digital transceiver in the central pager, or other sensors connected to the USB port of the calling terminal.

[0011] Optionally, the connection between the central pager and the external network of the system is a connection to the local or national emergency communication network in case of emergency; or in general cases, a connection to communication terminals such as WiFI network, mobile communication network, satellite networks such as Beidou, and digital radio stations; enabling the management personnel, when away from the central pager for various reasons, to use the external communication network to achieve remote communication with other calling terminals within the jurisdiction system through the central pager they manage, so as to build an emergency communication system that can be used for both normal and emergency situations with a larger coverage area.

[0012] According to the second aspect of the embodiments of the present application, a working method of an LDSW wireless calling system mainly used inside enterprises and institutions is provided.

[0013] The entire system utilizes a wireless local area communication network with a star network structure to achieve internal wireless voice and text communication within a limited range without relying on other broadband communication public networks; the method utilizes the working modes defined in the LDSW wireless communication technology standard, such as using the ID numbers of both communication parties as communication address codes, low-power sleep wake-up, channel hopping, and communication encryption, to distinguish the LDSW internal wireless calling system from general walkie-talkie communication; aiming at the working characteristics of the LDSW wireless calling system mainly used inside enterprises and institutions, using the LDSW communication technology standard, directly integrating the AD and DA conversion, voice compression and decompression functions, or integrating another simple low-frequency and low-rate wireless digital transceiver into a multi-functional SOC chip.

[0014] Optionally, as the most basic component of the system, the calling terminal is an LDSW intelligent electronic tag that is in a momentary periodic listening signal. It has various basic working characteristics of all LDSW intelligent electronic tags, including the characteristic of ultra-low power standby in the state of "ready to be awakened at any time and enter the working state", the characteristics of being searchable and locatable at any time and anti-theft; before the calling terminals enter voice communication with each other, the calling terminal is first awakened by the digital wake-up working instruction signal emitted by the central call device or the calling terminal of the communication initiating party, and enters the voice intercom working state according to the arrangement of the working instruction signal; moreover, after completing the voice intercom communication between both parties, it will return to the public signal listening channel and listen to the wake-up signal from the new communication initiating party in a momentary low-power state; at least one calling terminal in the system is set as the central call device and is given more functions and permissions. Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Structural schematic diagram of the calling terminal of the present invention;

[0017] Figure 2 Ultra-low power DNA sleep wake-up technology adopted by the present invention;

[0018] Figure 3 Schematic diagram of the LDSW internal wireless calling system of the present invention. Detailed Description of the Embodiments

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will further elaborate on the present invention in conjunction with specific embodiments.

[0020] The LDSW wireless call system within enterprises and institutions mentioned here consists of an LDSW central call device and several LDSW call terminals that can conduct two-way wireless voice communication with the central call device and are movable and portable. They all have a unique ID number. Each call terminal and the central call device are composed of a microphone for voice input, a small speaker for voice playback, a USB interface for charging the call terminal and data connection, a single-chip microcomputer that integrates voice sampling, AD conversion / voice compression, and DA conversion / voice decompression and then performs the voice playback function, and a low-frequency and low-rate wireless digital transceiver with radio frequency performance equivalent to that of a LORA low-frequency wireless transceiver. The single-chip microcomputer and the digital transceiver can be further integrated into a multifunctional SOC chip. Under the condition that the radio frequency operating characteristics of the wireless transceiver are determined, in order to achieve the farthest possible voice call distance and ensure the sound quality of the call voice, the voice compression ratio adopted by the single-chip microcomputer should not only meet the voice sampling rate in the range of 8 kHz - 16 kHz, but also ensure that the communication rate used by the low-frequency wireless digital transceiver is in the range of 2 kbps - 8 kbps. The specific size of the compression ratio adopted depends on the balance requirements between sound quality and communication distance in specific applications, so that on the premise of ensuring the sound quality of the voice call, the voice call signal can cover all places within most enterprises and institutions. See Figure 1The calling terminal usually adopts a low power consumption state of periodic sleep and after waking up, it listens to the digital wake-up signal sent from the central caller or other calling terminal that initiates the communication for a moment on the pre-set public signal monitoring channel. Referring to FIG. 2, the central caller or calling terminal that initiates the communication will continuously and repeatedly transmit the digital wake-up signal on the public radio frequency signal monitoring channel within a period of time greater than the sleep-wake-up cycle of the calling terminal receiving the signal, seize the moment when the wireless digital signal transceiver in the calling terminal receiving the signal wakes up and monitors the signal to establish communication with it, and convey to it the next work to be done. When the central caller and the calling terminal communicate with each other, their communication addresses are their respective ID numbers, and only the calling terminals whose ID numbers belong to the same LDSW internal wireless calling system can communicate wirelessly with the central caller or other calling terminals; the central caller or calling terminal can initiate point-to-point voice, digital text or code communication with any other calling terminal in the same communication system, and can also initiate point-to-multipoint broadcast voice, digital text or code communication with another group or all calling terminals in the system; each of the calling terminals has a number of control buttons that can communicate point-to-point with the central caller or other calling terminals, or point-to-multipoint broadcast communication. These buttons can be increased or decreased according to the actual application needs of the system, and can also be used in conjunction with a small display screen. ; The central caller manager can also load the software in the call terminal wirelessly and remotely according to the system application needs; the most important thing is that before entering the voice call communication, the call terminal is actually an LDSW smart electronic tag that is in a periodic monitoring signal for a moment. It first needs to be awakened by the digital wake-up work instruction signal emitted by the central caller or call terminal that initiates the communication, and enters the voice intercom working state according to the arrangement of the work instruction signal; and, after both parties complete the voice intercom communication, it will return to the public signal monitoring channel and continue to monitor the new wake-up signal sent from the call terminal that initiated the communication for a moment in a low-power state; the LDSW central caller is controlled and used by the manager of this internal communication system, and it can be given more functions and permissions.

[0021] The digital wake-up signal continuously and repeatedly transmitted by the central call device or call terminal initiating communication on the public signal monitoring channel includes at least the ID of the central call device or call terminal initiating communication and the ID of the wake-up signal recipient, as well as the work instruction information that the central call device or call terminal initiating communication needs to convey to the signal recipient. The content of the work instruction information includes at least whether the two parties to the communication need to jump to a new communication channel for wireless communication, whether this wireless communication needs to be encrypted, and the time arrangement for the two parties to return to the periodic sleep state after the upcoming wireless communication, especially the voice intercom communication ends; when the central call device or call terminal initiating communication initiates point-to-multipoint wireless digital broadcast communication, the ID of the wake-up signal recipient will be the group ID representing all call terminals that need to be woken up. Generally, the central call device of general enterprises and institutions is placed on the desks of department managers and is externally powered. The call terminals are generally carried by staff. In units with a large number of people, piecemeal or floor-by-floor management can also be carried out.

[0022] In addition to initiating point-to-point or point-to-multipoint broadcast communication with call terminals within the system, the central call device can also add more functions and permissions as needed: including selecting some or all of the following functions according to application needs: 1) The function of connecting to different communication networks outside the system, including connecting to the mobile network through the Cat1 module, connecting to the Beidou short message module or other satellite communication network ground terminals, and connecting to the remote public communication network through the low-frequency wireless data transmission radio; 2) The function of increasing the transmission power, receiving sensitivity, and antenna gain of its own wireless transceiver as needed to make the communication distance with other call terminals within the system farther; 3) The function of recording and storing the communication of other call terminals within the system; 4) Increasing the number of its own wireless communication channels and arranging more communication methods with the call terminals as needed; 5) The function of text information input and display; 6) The function of managing and restricting the wireless communication between the call terminals, including the function of prohibiting the call terminals within the system from initiating point-to-point communication with any other call terminal within the system; 7) The power supply guarantee required to meet some or all of the above functions. See Figure 3 When the manager using the central call device has a fixed office location, the central call device will be externally powered and there is no need to consider power saving. Therefore, the wireless transceiver in the central call device will continuously monitor the signal. At this time, when the call terminal initiating communication communicates with the central call device, the way it transmits the wake-up work instruction signal will no longer be the continuous repeated transmission method, but the method of transmitting a single wake-up work instruction signal packet.

[0023] When the central pager has the condition of being able to communicate with the calling terminal on multiple communication channels simultaneously, that is, when the central pager is configured with multiple transceiver channels, the central pager can also arrange for them to communicate with the central pager on different communication channels according to the differences in the ID numbers of the calling terminals.

[0024] The central pager can also receive wireless alarm information directly sent by intelligent sensors with their own wireless transceiver devices, or alarm information indirectly sent through other sensors connected to the calling terminal through the USB interface.

[0025] The connection between the central pager and the external network of the system can be either a connection to the local or national emergency communication network in case of emergency; or in normal circumstances, a connection to communication terminals such as WiFI network, mobile communication network, satellite networks such as Beidou, and digital radio stations; so that when the management personnel are away from the central pager for various reasons, they can use the external communication network to achieve remote communication links with other calling terminals within the system they manage through the central pager they manage, in order to build an emergency communication system that can be used for both peacetime and emergency with a larger coverage area.

[0026] The working method of the system of the present invention also has the following working characteristics: The entire system utilizes a wireless local area communication network with a star network structure to achieve internal wireless voice and text communication within a limited range without relying on other broadband communication public networks; the method utilizes the working modes defined in the LDSW wireless communication technology standard, such as using the ID numbers of both communication parties as communication address codes, low-power sleep wake-up, channel hopping, and communication encryption, to distinguish the LDSW internal wireless calling system from general walkie-talkie communication; not only realizes the confidentiality, low power consumption, and long distance of internal communication within the entire system; the working method of the system of the present invention also aims at the working characteristics of the system, utilizes the LDSW communication technology standard, and directly integrates the AD and DA conversion, voice compression and decompression functions, and if necessary, also integrates another simple low-frequency and low-rate wireless digital transceiver into a multi-functional SOC chip, in order to achieve the purpose of improving the integration and working reliability of the system and reducing costs.

[0027] The most basic component of the system of the present invention - namely, the calling terminal - is actually an LDSW intelligent electronic tag that is in a state of periodically monitoring a signal for an instant. Therefore, it also has various basic working characteristics of all LDSW intelligent electronic tags, including the characteristic of ultra-low power standby in the state of "always being able to be awakened to enter the working state", the characteristics of being able to be searched and located at any time and anti-theft; in the working method of the system of the present invention, before the calling terminal enters the voice communication with each other, it first needs to be awakened by the digital wake-up working instruction signal transmitted by the central call device or the calling terminal of the communication initiating party, and then it can enter the working state of voice intercom according to the arrangement of the working instruction signal. This is also the biggest difference between the calling system of the present invention and the general voice intercom system. Moreover, after the voice intercom communication between the two parties is completed, it will return to the common signal monitoring channel and monitor the low-power state at the instant of receiving the wake-up signal sent by the new communication initiating party; another characteristic of the working method of the system of the present invention is to set at least one calling terminal in the system as the central call device and endow it with more functions and permissions to increase the functions of the system; at the same time, while meeting the needs of more market applications, the LDSW internal wireless communication system of the present invention also becomes an independent communication system that can be used in both normal and emergency situations and can be remotely controlled.

[0028] The beneficial effects of the present invention are as follows:

[0029] The system of the present invention can not only replace the general intercoms widely used in enterprises, institutions, community property management, home-based elderly care, restaurants, hotels, etc., and the building intercom system using wired connections, but also be used in production management, public safety, emergency disaster relief with higher requirements, and military application scenarios with lower requirements.

[0030] In addition, regarding a working method of an LDSW wireless calling system mainly used within enterprises and institutions, that is, a working method of an LDSW internal wireless calling system for a limited area, we will illustrate it with the application of the calling system in a hospital:

[0031] We install a central call device at each nurse's station in the hospital, a call terminal at the head of each hospital bed, and each nurse or doctor also carries a call terminal with them. An LDSW intelligent sensor tag for prompting the replacement of the infusion bottle or infusion bag and capable of directly communicating wirelessly with the central call device is installed on each infusion bottle or infusion bag. This LDSW sensor tag is associated with the patient and the patient's bed number. When the weight of the infusion bottle or infusion bag detected by the sensor tag decreases to the point where the infusion bottle or infusion bag needs to be replaced, the LDSW sensor tag will send an alarm signal to the central call device at the nurse's station, and the central call device at the nurse's station will notify the relevant responsible nurse to go and handle it; when the patient has a situation, the patient can also use the call device at the head of his bed to notify the central call device at the nurse's station, and the nurse's station will call the relevant responsible doctor or nurse to go and handle it. The central call device can also be connected to the hospital computer network and the existing hospital management system software. When a problem occurs or the patient needs help, the system will automatically complete the docking between this help call terminal and the call terminals of the relevant responsible doctor or nurse through the central call device at the nurse's station. The LDSW intelligent sensor terminal described here refers to an intelligent sensor that can directly communicate wirelessly with the wireless digital transceiver in the central call device. For some special patients who need to be monitored at any time, this special patient can also carry a call terminal with them, and the monitoring sensor worn on the patient's body is connected to the call terminal carried by the patient through a USB interface. When the data of the monitoring sensor worn by the special patient exceeds the alarm threshold, the call terminal carried by the patient will send an alarm message to the nurse's station, and the nurse's station will notify the relevant doctor or nurse to handle it in a timely manner through the hospital's internal call system.

[0032] The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as a limitation of the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. For those of ordinary skill in the art in this technical field, without departing from the spirit and scope of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A LDSW wireless calling system mainly used in enterprises and institutions, characterized in that: The system consists of an LDSW central pager and several portable and portable LDSW call terminals with two-way wireless voice communication function with the central pager, each of which has a unique ID number; each call terminal and central pager consists of a microphone for voice recording and a small speaker for voice playback, a USB interface for charging and data connection of the call terminal, a single-chip microcomputer integrating voice sampling, AD conversion / voice compression and DA conversion / voice decompression, and then voice playback function, and a low-frequency and low-rate wireless digital transceiver with radio frequency performance equivalent to that of the LORA low-frequency wireless transceiver; the single-chip microcomputer and the The digital transceiver is independently configured or integrated into a multifunctional SOC chip; under the condition that the RF working characteristics of the wireless transceiver have been determined, the voice compression ratio adopted by the single chip not only meets the voice sampling rate in the range of 8khz-16khz, but also meets the communication rate used by the low-frequency wireless digital transceiver in the range of 2kbps-8kbps, and the specific compression ratio is adopted to meet the balance requirements between the sound quality and the communication distance of the specific application; the calling terminal usually adopts a periodic sleep mode, and after waking up, it monitors the digital wake-up signal sent from the central caller or other calling terminals that initiates the communication on the pre-set public signal monitoring channel for a moment of low power consumption. state; the central caller or calling terminal that initiates the communication will continuously and repeatedly transmit a digital wake-up signal on the public RF signal monitoring channel within a period of time that is greater than the sleep-wake-up cycle of the calling terminal receiving the signal, seize the moment when the wireless digital signal transceiver in the calling terminal receiving the signal wakes up and monitors the signal to establish communication with it, and convey to it the next work to be done; when the central caller and the calling terminal communicate with each other, their communication addresses are their respective ID numbers, and only the calling terminals whose ID numbers belong to the same LDSW internal wireless calling system have the ability to communicate wirelessly with the central caller or other calling terminals The central caller or calling terminal can initiate point-to-point voice, digital text or code communication with any other calling terminal in the same communication system, and can also initiate point-to-multipoint broadcast voice, digital text or code communication with a group or all of the calling terminals in the system; each of the calling terminals has a number of control buttons with point-to-point communication or point-to-multipoint broadcast communication functions with the central caller or other calling terminals, and these buttons are increased or decreased according to the actual application needs of the system, and also have the function of being used in conjunction with a small display screen; the central caller manager can wirelessly remotely load the software in the calling terminal according to the application needs of the system;Before entering the voice call communication, the calling terminal is an LDSW smart electronic tag that is in a periodic monitoring signal for a moment. It first needs to be awakened by the digital wake-up work instruction signal transmitted by the central caller or calling terminal that initiates the communication, and enters the working state of voice intercom according to the arrangement of the work instruction signal; and after both parties complete the voice intercom communication, it will return to the public signal monitoring channel and continue to monitor the new wake-up signal sent from the calling terminal that initiated the communication for a moment in a low-power state; the LDSW central caller is controlled and used by the administrator of this internal communication system, and it has the function of being given more functions and permissions. ; 2. According to claim 1, it is characterized in that The digital wake-up signal transmitted continuously and repeatedly on the public signal monitoring channel by the central caller or calling terminal that initiates the communication includes at least the ID of the central caller or calling terminal that initiates the communication and the ID of the wake-up signal recipient, as well as the work instruction information that the central caller or calling terminal that initiates the communication needs to convey to the signal recipient; the work instruction information includes at least whether the communicating parties need to jump to a new communication channel for wireless communication, whether the wireless communication needs to be carried out in a certain encryption method, and the wireless communication that the two parties are about to start, especially the time schedule for returning to the periodic sleep state after the voice intercom communication ends; when the central caller or calling terminal that initiates the communication initiates a point-to-multipoint wireless digital broadcast communication, the ID of the wake-up signal recipient is the group ID of all calling terminals that need to be awakened.

3. According to claim 1 or 2, it is characterized in that In addition to initiating point-to-point or point-to-multipoint broadcast communications to the calling terminals in the system, the central caller also has some or all of the following functions: the function of selecting connections with different communication networks outside the system as needed, including connecting with the mobile network through the Cat1 module, connecting with the remote public communication network through the Beidou short message module or other satellite communication network ground terminals, and connecting with the remote public communication network through the low-frequency wireless data transmission radio station; the function of increasing the transmission power, receiving sensitivity, and antenna gain of its own wireless transceiver as needed to make the communication distance between it and other calling terminals in the system farther; the function of recording and storing communications with other calling terminals in the system; the function of increasing the number of its own wireless communication channels as needed, and arranging more communication methods with the calling terminals; the function of inputting and displaying text information; the function of managing and restricting the wireless communications between the calling terminals, including the function of prohibiting the calling terminals in the system from initiating point-to-point communications with any other calling terminals in the system; and the power supply guarantee required to meet some or all of the above functions.

4. According to claim 3, it is characterized in that If the power supply conditions permit, the central caller will adopt a method of continuous signal monitoring. At this time, when the calling terminal that initiates the communication communicates with the central caller, the method of transmitting the wake-up work instruction signal will no longer adopt a continuous and repeated transmission method, but a single wake-up work instruction signal package method.

5. According to claim 4, it is characterized in that When the central caller has the conditions to communicate with the calling terminals on multiple communication channels at the same time, the central caller arranges the calling terminals to communicate with the central caller on different communication channels according to the differences in their ID numbers.

6. According to claim 3, it is characterized in that The central caller receives wireless alarm information from other sensor terminals and automatically notifies the relevant call terminal; the sensor terminal mentioned here refers to an intelligent sensor that can directly communicate wirelessly with the wireless digital transceiver in the central caller, or other sensors connected to the USB port of the call terminal.

7. According to claim 3, it is characterized in that The central call device is connected to a network outside the system, and in an emergency, it is connected to a local or national emergency communication network; or in general, it is connected to a WiFI network, a mobile communication network, a Beidou satellite network, a digital radio station and other communication terminals; when the management personnel are away from the central call device for various reasons, they can use the external communication network to achieve remote communication between other call terminals in the system under their jurisdiction through the central call device they manage, so as to build an emergency communication system with a larger coverage for both peace and emergency.

8. A working method of the LDSW wireless calling system mainly used in enterprises and institutions, characterized in that: The whole system utilizes a wireless local area communication network with a star network structure, and can realize internal wireless voice and text communication within a limited range without relying on other broadband communication public networks; the method utilizes the working modes defined in the LDSW wireless communication technical standard, such as using the ID numbers of the communicating parties as communication address codes, low-power sleep wake-up, channel hopping and communication encryption, to distinguish the LDSW internal wireless calling system from general walkie-talkie communication; in view of the working characteristics of the LDSW wireless calling system mainly used in enterprises and institutions, the LDSW communication technical standard is utilized to directly configure AD and DA conversion, voice compression and decompression functions independently or integrate another simple low-frequency and low-rate wireless digital transceiver into a multifunctional SOC chip.

9. According to claim 8, the most important feature of the method is that the calling terminal, as the most basic component of the system, is an LDSW smart electronic tag that is in a periodic monitoring signal for a moment, and has various basic working characteristics of all LDSW smart electronic tags, including the ultra-low power standby feature of "being awakened and entering the working state at any time", and the search and rescue positioning and anti-theft features at any time; before the calling terminal enters into voice communication with each other, the calling terminal is first awakened by the digital wake-up work instruction signal transmitted by the central caller or calling terminal of the initiator of communication, and enters the working state of voice intercom according to the arrangement of the work instruction signal; and, after completing the voice intercom communication between the two parties, it will return to the public signal monitoring channel and monitor the wake-up signal sent from the new communication initiator for a moment of low power consumption; at least one calling terminal in the system is set as a central caller, and it is given more functions and permissions.

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