A method for fusing communication of an analog signal intercom and a public network intercom

Abstract

The application relates to the technical field of communication, and discloses a method for fusion communication of an analog signal intercom and a public network intercom, which comprises the following steps: directly sensing the physical on-off state of a talk key of an analog intercom to generate a binary state signal without coding and decoding of a voice signal; mapping the state signal into a public network standardized uplink request signaling which does not carry user data, and sending the state signal as a cross-domain state beacon to trigger the selection and scheduling of heterogeneous communication resources, so that the processing delay and power consumption inherent in signal translation in the existing fusion mode are avoided, the state synchronization between heterogeneous networks is nearly instantaneous, the resource selection is efficient, and the operation reliability and adaptability of the system under complex working conditions are improved.

Description

TECHNICAL FIELD

[0001] The application relates to a method for fusing communication of an analog signal intercom and a public network intercom, and belongs to the technical field of communication. BACKGROUND

[0002] In a complex working environment such as a large infrastructure project or an emergency response, in order to ensure the global coverage of communication and the effective transmission of instructions, a public network intercom system with wide-area connection capability and an analog intercom system with better penetration in signal blind areas are often fused. At present, the mainstream technical path for realizing such fusion is to take signal content translation as the core, that is, through a gateway device, analog voice signals of one party are subjected to complete analog-digital conversion, source coding and network packetization, and then transmitted to the other party for decoding and digital-analog conversion and playing, and vice versa.

[0003] However, when such a fusion mode based on content translation is placed in a high-density and high-time-efficiency working scene, its inherent technical limitations will be revealed. Due to the complete signal coding and decoding and network encapsulation process, multi-stage processing delay is inevitably introduced. In command and dispatch requiring multiple interactions across gateways, this accumulated delay often leads to a response lag of on-site instructions, missing critical working opportunities. At the same time, in order to obtain the state information of whether the most basic channel required for channel selection and allocation decision is occupied, the existing mode still needs to perform continuous digital processing on the complete voice content with high energy consumption, which constitutes a significant waste of computing resources and terminal power for resource selection scenes that only need to judge the presence or absence of content.

[0004] Specifically, the existing technology mainly has the following deficiencies: 1. The processing delay inherent in the multi-stage signal coding and decoding process affects the efficiency and safety of cross-network cooperation in high real-time requirement scenarios; 2. The way of processing all voice content to obtain channel occupation status causes principle-based power consumption and computing power redundancy at the decision level of resource selection; 3. The architecture that relies on a complex central gateway for signal translation increases the cost and complexity of system deployment and constitutes a potential single-point failure risk in harsh environments. Therefore, how to abandon the high-cost signal content translation mode and create a method for realizing intelligent selection and cooperation of cross-domain resources based on direct perception of communication intent with low delay and small overhead has become a technical problem to be solved by the application. SUMMARY

[0005] The application provides a method for fusing communication of an analog signal intercom and a public network intercom, which mainly aims to solve the problems of principle-based delay, high power consumption and system complexity caused by relying on signal content translation in the existing fusion communication mode.

[0006] In order to achieve the above object, the application provides a method for fusing communication of an analog intercom and a public network intercom, comprising the following steps:

[0007] Step a, a state sensing step, through a hardware comparison circuit directly connected with a physical circuit of a talk key of the analog intercom, at the moment when the talk key is pressed, without performing any analog-to-digital conversion and encoding processing on a voice signal, directly detecting a level state change of the physical circuit to generate a binary state signal representing communication initiation or communication termination which is uniquely determined by the level state change;

[0008] Step b, a signaling mapping step, in a public network communication module of the intercom, mapping a specific level state representing communication initiation in the binary state signal into a standardized uplink resource scheduling request signaling not carrying user data defined in a physical uplink control channel of a public network communication protocol;

[0009] Step c, a scheduling strategy step, by the intercom terminal, at the moment when the talk key is pressed, selecting and executing a scheduling strategy in communication medium, information processing flow and network resource allocation mode according to a public network signal coverage strength in which the intercom terminal is located;

[0010] Step d, a beacon sending step, when the intercom terminal selects the scheduling strategy, triggering the public network communication module to send the standardized uplink resource scheduling request signaling to a network side of the public network to request a successful sending of the signaling as a cross-domain state beacon that the analog channel has been occupied, wherein the network side of the fusion scheduling platform executes the scheduling strategy after monitoring the cross-domain state beacon;

[0011] In step c, the scheduling strategy executed by the intercom terminal comprises: at the moment when the talk key is pressed, the terminal first judges whether the public network signal coverage strength in which the terminal is located is higher than a preset stable communication threshold; if the result of the judgment is yes, the terminal selects to start a public network voice information protocol for voice transmission and keeps an analog signal transmitting circuit of the analog intercom in an inactivated state, and simultaneously sends the cross-domain state beacon; if the result of the judgment is no, the terminal selects to start the analog signal transmitting circuit for voice transmission, and no matter which voice transmission path is selected, the terminal sends the cross-domain state beacon;

[0012] In step d, the scheduling strategy executed by the network side of the fusion scheduling platform comprises: the network side keeps a bridge gateway function for recording and network forwarding of the analog voice signal in a closed state when the cross-domain state beacon is not monitored; and activates the bridge gateway function when the cross-domain state beacon is monitored.

[0013] Preferably, the hardware comparison circuit in step a is a voltage comparator circuit, an input end of which is connected with a physical contact of the talk key, for detecting a voltage step change generated when the physical contact is closed or opened.

[0014] Preferably, before beacon transmission, the method further includes: a local broadcasting step, whereby after generating a binary status signal, the walkie-talkie terminal broadcasts the status signal containing its unique identifier locally through a second wireless communication module; a status aggregation step, whereby a local relay gateway receives and aggregates status signals from one or more walkie-talkie terminals within a preset time window to generate a status terminal list containing the unique identifiers of all terminals that have initiated communication; and the beacon transmission step in step c is performed by the local relay gateway, whose signaling to the public network side carries the status terminal list.

[0015] Preferably, the local relay gateway also performs the following adaptive channel compensation steps: periodically transmitting a standardized low-power probe signal during its communication idle time slots, and analyzing the response characteristics of the probe signal to obtain a received signal strength indication characterizing the current local broadcast channel quality. When the received signal strength indicator Less than a preset channel health threshold At that time, that is If this occurs, a time-frequency diversity compensation mechanism is triggered, which copies the state terminal list into two data packets and repeatedly transmits them on two or more preset different frequency points and different time slots.

[0016] Preferably, the following closed-loop feedback calibration steps are also included: at the instant the talk button is pressed, a micro-resistor sampling resistor connected in series with the power supply circuit of the talk button is used to capture and analyze the transient curve of the start-up current of the power supply circuit of the talk button within a preset microsecond time window; based on the peak current magnitude and the time to reach the peak value of the transient curve of the start-up current, the internal resistance state characterizing the health of the walkie-talkie's power supply battery is retrieved from a preset mapping relationship stored in the walkie-talkie terminal; and the reference voltage threshold of the hardware comparison circuit in step a is dynamically adjusted according to the internal resistance state.

[0017] Preferably, in the state aggregation step, before generating the state terminal list, the local relay gateway also performs a jitter filtering operation to filter out state signals received within the time window whose duration is less than a preset minimum effective call duration from the data to be aggregated.

[0018] Preferably, the method further comprises the following steps for personnel posture accompanying perception: the second wireless communication module of the intercom terminal continuously receives the periodic synchronization beacon signal broadcasted by the local relay gateway during its communication idle period; the intercom terminal analyzes the micro-Doppler effect characteristics of the carrier frequency of the synchronization beacon signal caused by the body movement of the personnel holding the intercom terminal, and extracts the mode representing the personnel posture from the time-domain variation spectrum of the characteristics by matching with a preset posture mode library; and when the mode matches a preset abnormal falling posture, a high-priority alarm information is triggered to be sent.

[0019] Preferably, the second wireless communication module is a narrowband communication module working in the licensed-exempt frequency band using LoRa or FSK modulation.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1. The present application directly detects the on-off state of the talk key at the physical circuit level to generate a binary state signal, and maps it to a standardized uplink resource scheduling request signaling that does not carry user data in the public network, avoiding the complete processing flow of analog-to-digital conversion, encoding, and IP encapsulation of analog voice signals; this change makes the state synchronization between heterogeneous networks no longer subject to the inherent processing delay and computational resource consumption of complex encoding and decoding, but only depends on the response speed of the physical circuit and the transmission delay of the basic network signaling, thereby providing users with a low-latency cross-network collaboration experience in scenarios that require immediate response, and significantly reducing the continuous working power consumption of the terminal device.

[0022] 2. The present application autonomously selects between starting the public network voice information protocol or starting the analog signal transmission circuit according to the public network signal coverage strength it is in at the terminal side, ensuring that the communication is always carried out on the currently optimal available channel; further, by sending this selection intention in the form of a unified cross-domain state beacon to the network, the entire communication system, including the network side platform and other terminal users, can instantly learn about the channel occupation situation, thereby providing a clear and reliable decision basis for subsequent resource scheduling, channel assignment, and avoiding communication conflicts, and constructing a distributed low-cost and intelligent channel selection and management mechanism.

[0023] 3、The application further introduces a local relay gateway using narrowband communication technology to aggregate and purify the communication status beacons initiated by multiple terminals in high-density scenarios at the front end, converting the high-concurrency requests that may have caused congestion and disorder of the public network signaling channel into an orderly single and highly reliable data stream before unified reporting, effectively solving the signaling storm bottleneck in large-scale applications, and by integrating channel quality active diagnosis and adaptive time-frequency diversity compensation logic based on a micro-power probe into the aggregation mechanism, the entire state-aware link can maintain high communication reliability when facing strong electromagnetic interference common in industrial sites, showing adaptability in complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 A flowchart of the method for simulating signal intercom and public network intercom fusion communication of the application;

[0025] Fig. 2 A performance comparison chart of the adaptive channel compensation mechanism of the application under different channel qualities;

[0026] Fig. 3 An internal state machine flowchart of the fusion communication terminal of the application.

[0027] The purpose of the application, functional features and advantages will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the application clearer and more apparent, the application will be further described in detail below with reference to the accompanying drawings and embodiments, and it should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the application belong to the scope of protection of the application.

[0029] The application discloses a method for fusing analog signal intercom and public network intercom, which is systematically constructed on a content-independent lightweight beacon mechanism. The method mainly comprises the following stages: a physical state sensing stage without voice signal coding and decoding processing; a signaling mapping stage for mapping the physical state into standardized signaling of the public network; a beacon sending stage for sending the signaling as a cross-domain state beacon; and a heterogeneous communication resource selection and scheduling stage triggered by the beacon. In a working environment such as a large infrastructure project or emergency response, a common challenge is that when a public network intercom system with wide-area connection capability needs to be fused with an analog intercom system with better penetration in a signal blind area, the existing fusion method based on signal content translation inevitably introduces processing delay affecting the cooperation efficiency and safety due to the inherent multi-stage signal coding process. To address this challenge, the method provided by the application directly detects the level state change of the physical circuit at the moment when the talk key is pressed by a hardware comparison circuit directly connected with the physical circuit of the talk key, to generate a binary state signal representing communication initiation or communication termination, which is uniquely determined by the level state change. The hardware comparison circuit can be a voltage comparator circuit, the input end of which is connected with the physical contact of the talk key, for detecting the voltage step change generated when the physical contact is closed or opened. This procedure does not perform any analog-to-digital conversion and coding processing of the voice signal, but directly converts the physical behavior of the user's communication intention into state information, thereby reducing the state acquisition delay from the hundred-millisecond level required by the voice signal processing to the nanosecond level of the physical circuit response, providing a basis for subsequent instantaneous cross-network cooperation. Accordingly, in the signaling mapping step, the public network communication module of the intercom maps the specific level state representing communication initiation in the binary state signal into a standardized uplink resource scheduling request signaling defined in the physical uplink control channel of the public network communication protocol, which does not carry user data. A specific implementation is to map the state into the scheduling request signaling defined in the long term evolution technology or the fifth generation mobile communication technology protocol. The SR signaling itself is only a 1-bit resource request identifier, and the transmission overhead is extremely low. Then, in the beacon sending step, when the binary state signal indicates communication initiation, the public network communication module sends the standardized uplink resource scheduling request signaling to the public network side, and the successful sending of the signaling is taken as the cross-domain state beacon that the analog channel has been occupied. By mapping a pure physical layer state and using a standardized control signaling for announcement, the method constructs a state synchronization mechanism between heterogeneous networks, which no longer depends on high-power and high-delay voice content translation, but realizes the cross-domain transmission of the core information whether the channel is occupied with lower system resource overhead.

[0030] After monitoring the cross-domain state beacon, the system enters a resource selection step, in which a scheduling strategy is selected and executed by the network-side fusion scheduling platform or the intercom terminal according to preset resource optimization rules in terms of communication media, information processing flow, and network resource allocation mode. For the intercom terminal, a common working condition is that the public network signal coverage strength where the terminal is located is dynamically changing. In view of this, the scheduling strategy executed by the terminal is configured as a deterministic procedure containing redundant path selection, that is, when the talk key is pressed, the terminal first determines whether the public network signal coverage strength where the terminal is located is higher than a preset stable communication threshold. The determination of the threshold can be made through offline calibration, for example, an area where the reference signal received power is lower than a certain specific value, such as -110 dBm, is defined as a weak signal area, and the specific value constitutes the stable communication threshold. If the determination result is yes, the public network voice information protocol is started to transmit voice, and the analog signal intercom analog signal transmitting circuit is kept in an inactive state. If the determination result is no, the analog signal transmitting circuit is started to transmit voice. Regardless of the selected voice transmission path, the terminal simultaneously executes the beacon sending step. This dual-path selection and unified beacon sending mechanism ensures that communication is always carried out on the current optimal channel, and at the same time ensures that the entire system, including the network-side platform and other terminals, can instantly know the channel occupation situation, providing reliable decision basis for global resource scheduling. For the network-side fusion scheduling platform, the resource selection it executes includes keeping the bridging gateway function for recording and network forwarding of analog voice signals in a closed state to save computing and storage resources when no cross-domain state beacon is monitored, and activating the bridging gateway function to translate and distribute voice content in the analog channel on demand after the cross-domain state beacon is monitored. In this way, the original continuous monitoring and content processing necessary to obtain the channel state are converted into an event-driven resource scheduling mode triggered by a lightweight beacon, which significantly reduces the network-side principle power consumption and algorithm redundancy.

[0031] Furthermore, in high-density and high-concurrency operational scenarios, the simultaneous initiation of communication by a large number of terminals within a short period of time may lead to congestion of the uplink control channel of the public network, i.e., a signaling storm. To address this challenge, this invention also provides an enhanced method for front-end aggregation and purification. Between the signaling mapping step and the beacon transmission step, a local broadcast step and a state aggregation step are included. In the local broadcast step, after generating a binary state signal, the walkie-talkie terminal broadcasts the state signal containing its unique identifier locally through a second wireless communication module. The second wireless communication module can be a narrowband communication module operating in an authorized exemption frequency band using LoRa or FSK modulation. The signaling module features low power consumption and simple networking. In the state aggregation step, the local relay gateway receives and aggregates state signals from one or more walkie-talkie terminals within a preset time window, such as 100 milliseconds, to generate a state terminal list containing unique identifiers of all terminals that have initiated communication. Furthermore, the beacon sending step is executed by the local relay gateway, and the signaling sent to the public network carries the state terminal list. This front-end aggregation mechanism transforms multiple disordered terminal requests that might otherwise cause channel congestion into an ordered and single data stream uniformly reported by the local relay gateway, thereby avoiding the risk of signaling storms.

[0032] To further enhance the reliability of the aggregation mechanism under complex operating conditions, the local relay gateway can perform jitter filtering before generating the status terminal list. By setting a preset minimum effective call duration, such as 200 milliseconds, status signals received within the time window with a duration shorter than this duration are filtered out from the data to be aggregated, thus avoiding invalid signaling reports caused by users accidentally pressing buttons. In addition, when facing strong electromagnetic interference common in industrial sites, the quality of the local broadcast channel may degrade. To address this, the local relay gateway can also perform an adaptive channel compensation step, periodically transmitting a standardized low-power probe signal during its communication idle time slots and analyzing the response characteristics of the probe signal to obtain a received signal strength indication characterizing the current quality of the local broadcast channel. When the received signal strength indicator Less than the preset channel health threshold At that time, that is If the state terminal list is copied into two data packets, it will be repeatedly transmitted on two or more preset different frequency points and different time slots. This mechanism enables the state-aware link to dynamically adapt to harsh electromagnetic environments and ensures the reliability of communication.

[0033] The application also realizes closed-loop feedback calibration of the system state by deep mining of the terminal internal circuit characteristics. With the aging or power consumption of the terminal battery, the unstable voltage may cause the drift of the determination threshold of the hardware comparison circuit. To eliminate this hidden danger, the method further includes a closed-loop feedback calibration step. At the moment when the talk key is pressed, the starting current transient curve of the power supply circuit of the talk key within a preset microsecond time window is captured and analyzed through a micro-resistance sampling resistor connected in series with the power supply circuit of the talk key. Based on the peak current size of the starting current transient curve and the time to reach the peak, the internal resistance state representing the health degree of the intercom power supply battery is inversely derived from the mapping relationship stored in the intercom terminal, which is preset and calibrated through offline experiments. According to the internal resistance state, the reference voltage threshold of the hardware comparison circuit in the state sensing step is dynamically adjusted. This closed-loop calibration procedure enables the core state input judgment to resist the measurement deviation introduced by the change of the power supply state, ensuring the determination reliability in the whole life cycle of the equipment. In the case of no conflict, the second wireless communication module can also be reused to realize value-added functions, such as personnel posture accompanying sensing. The second wireless communication module of the intercom terminal continuously receives the periodic synchronization beacon signals broadcast from the local relay gateway during its communication idle period, analyzes the micro-Doppler effect characteristics of the carrier frequency of the synchronization beacon signal caused by the body activity of the person holding the intercom terminal, and then extracts the mode representing the personnel posture from the time-domain variation spectrum of the characteristics by matching with the preset posture mode library constructed by the standard action sample library. When the mode matches the preset abnormal falling posture, a high-priority alarm information is triggered to be sent. This method expands the communication equipment into a work terminal with both communication and safety warning capabilities without adding additional hardware sensors.

[0034] In a tunneling operation, the mixed communication environment includes a command center at the tunnel portal with stable public network signal coverage, a mechanical operation team at the middle section of the tunnel with good public network signal coverage, and a geological exploration team at the tunneling face with weak public network signal coverage. When the geological exploration team identifies a high-risk geological structure anomaly in front of the tunneling face through drilling data and needs to immediately notify the mechanical operation team behind to stop tunneling, the team leader presses the talk key of the intercom; at the moment the talk key is pressed, the hardware comparison circuit inside the intercom generates a binary state signal representing the initiation of communication. At the same time, the terminal public network communication module determines that the public network signal coverage strength is lower than the preset stable communication threshold, selects to start the analog signal transmission circuit to broadcast the user's voice instruction, and simultaneously maps the binary state signal into a standardized uplink resource scheduling request signaling, which is sent to the network side through the weak but still usable public network uplink control channel. The sending of this request signaling constitutes the cross-domain state beacon that the analog channel is occupied. Here, the terminal's autonomous path selection mechanism and the cross-domain state beacon sending mechanism form a synergy, that is, whether the terminal selects public network voice due to good signal or analog voice due to poor signal, the intention to initiate communication is immediately broadcast to the entire network in the form of a unified beacon, solving the principle of the traditional fusion scheme that must wait for the gateway to complete the voice content translation to know the remote channel state.

[0035] After the network side fusion scheduling platform detects the cross-domain state beacon, it immediately knows the communication state of the geological exploration team without waiting for the reception and decoding of the analog voice signal, and immediately pushes a high-priority control instruction to all terminals of the mechanical operation team under public network coverage. The instruction makes the receiving terminal display an alarm that the analog channel is occupied, prompting the mechanical operator to pause the operation and pay attention to the communication dynamics. After a few seconds, the voice instruction from the geological exploration team to stop tunneling translated by the bridge gateway function activated by the fusion scheduling platform is sent through the public network, confirming the content of the alarm state. This process divides the single process of understanding content first and then deciding action in traditional fusion communication into a two-channel process of state information preceding content information, making the transmission of state information much faster than that of content information, so that the response to risks is no longer subject to the delay of cross-network voice transcoding.

[0036] If multiple members in the geological exploration team press the talk button simultaneously in an emergency, the second wireless communication module in the intercom terminal will broadcast the state signals containing unique identity codes locally. The local relay gateway deployed near the team will aggregate the states and filter the jitter within a preset time window, and generate a state terminal list. The gateway will report the list to the command center through its public network communication module. This state aggregation mechanism, combined with the beacon sending mechanism, aggregates multiple concurrent state signals into a single signal report, resolving the conflict between the impact on public signaling channel capacity and the overall system reliability during large-scale terminal concurrent communication. Meanwhile, if the electromagnetic interference generated by large equipment operation in the tunnel causes the local relay gateway to diagnose that the local broadcast channel quality is lower than the preset channel health threshold The adaptive channel compensation step executed by the gateway will repeatedly send the state terminal list through time-frequency diversity. This compensation mechanism, combined with the state aggregation mechanism, provides another reliability guarantee for the entire state-aware link in a complex electromagnetic environment. Finally, the mechanical operation team has stopped the tunneling operation before the voice command arrives based on the state alarm received in advance. The communication intention of the geological exploration team has achieved synchronization across heterogeneous networks at a speed close to the physical circuit response speed. The communication state of the entire operation environment remains transparent to the command center. Through the internal synergy of multiple mechanisms, the system maintains low latency and high reliability in the transmission of instructions in a dynamically changing signal environment and complex electromagnetic working conditions.

[0037] Example 2: To objectively verify the changes in core performance indicators of the method of the present invention in heterogeneous network converged communication compared with traditional signal translation schemes, this comparative experiment was established. The experimental platform consisted of a programmable commercial-grade LTE network simulator, a power analyzer for accurately recording terminal power consumption, a high-precision time synchronization server, and 50 converged communication terminals integrating the method of the present invention. An additional 50 terminals using traditional voice signal encoding / decoding and IP encapsulation technologies were set as a control group. The experimental environment, by adjusting the parameters of the LTE network simulator, could reproduce various operating conditions from the central stable coverage area to the edge weak signal area. During the experiment, the state aggregation time window parameter of the local relay gateway was set. This parameter setting needed to strike a balance between ensuring the integrity of capturing a group of concurrent requests and minimizing the additional delay introduced by the aggregation process. Its value was mainly influenced by the number of users pressing the talk access button after receiving the instruction. To mitigate the impact of reaction time distribution and cover the behavioral patterns of the vast majority of users, the time window was set to 100 milliseconds. This value is based on a study of the statistical model of standard human reaction time distribution and aims to capture the vast majority of concurrent actions within a standard deviation range. All terminals were calibrated to the same time reference through a time synchronization server to ensure the accuracy of end-to-end latency calculation. The experiment was divided into three stages. First, in a single-user scenario, the test terminal and the control group terminal were instructed to initiate a cross-network communication, and their end-to-end state synchronization latency and single synchronization power consumption were recorded. Then, in a high-density scenario, communication instructions were sent to 10 terminals simultaneously to simulate team-level collaborative operations. Finally, in an ultra-high-density scenario, communication instructions were sent to all 50 terminals simultaneously to simulate the signaling storm condition at the beginning of an emergency response, and the success rate of reporting status beacons or equivalent information in the latter two stages was recorded. The experimental data are shown in Table 1.

[0038] Table 1: Performance comparison data of the method of the present invention and the control group under different working conditions.

[0039]

[0040] From the data of Table 1, it can be seen that in the single terminal working condition, the end-to-end state synchronization delay and terminal power consumption of the method of the present application are reduced by more than one order of magnitude compared with the control group, and the reason is that the method of the present application directly senses the physical on-off state of the talk key through a hardware comparison circuit and maps it into a lightweight cross-domain state beacon, which avoids the large amount of calculation processing and time consumption required for analog-to-digital conversion, source coding and network packetization of complete voice signals in the method of the control group; when entering the high-density concurrent scene, the request success rate of the method of the present application remains high and the delay grows gently, which benefits from the front-end aggregation mechanism, i.e. the local relay gateway aggregates the local broadcast state signals of multiple terminals and then reports to the public network, which effectively suppresses the signaling collision caused by a large number of terminals competing for the uplink channel at the same time, while the request success rate of the method of the control group decreases significantly in the high-density working condition, and the delay is also deteriorated sharply due to a large number of random backoff and retransmission.

[0041] Embodiment 3: This embodiment combines Figs. 1 to 3 to implement and describe a method for fusion communication of an analog intercom and a public network intercom, as shown in Fig. 1 The flow starts from the initial action of the user pressing the talk key in the upper left corner, which directly triggers the core state sensing step, i.e. detecting the level state change of the physical circuit through a hardware comparison circuit to generate a binary state signal, and at the same time, it also triggers the closed-loop feedback calibration step, which inverses the battery internal resistance state by capturing the starting current transient curve and dynamically adjusts the reference voltage threshold to ensure the reliability of the core state sensing; the generated binary state signal then enters the signaling mapping step and is mapped into a standardized uplink resource scheduling request signaling that does not carry user data, and then enters the resource selection step (terminal), which is triggered by the terminal to start the public network or analog voice transmission according to the public network signal strength and trigger the beacon sending step, and the sending of this request signaling serves as a cross-domain state beacon indicating that the analog channel has been occupied; after the beacon is sent, it will trigger the resource selection step (network), which activates the bridge gateway function to translate and distribute the analog voice on demand after the network side platform detects the beacon; in addition, for high-concurrent scenes, the present application also provides an enhanced path, which can first perform the local broadcast step after the state sensing step, i.e. broadcasting the state signal containing its own ID through the second wireless module, and then performing the state aggregation step by the local gateway to receive and aggregate the state signals of multiple terminals, performing jitter filtering to generate a state terminal list, and finally performing the beacon sending step (gateway) by the gateway to uniformly report the signaling carrying the state terminal list, thereby avoiding the signaling storm; this aggregated state beacon can also trigger the resource selection of the network side, thereby constituting a complete and closed-loop fusion communication method that takes into account both regular and high-concurrent scenes.

[0042] As Fig. 2 shown, the horizontal axis of the chart is RSSI signal strength (dBm) representing channel quality, and the vertical axis is communication success rate (%); the chart contains two curves, in which the dotted line connected by hollow circle points represents the performance without compensation mechanism, and the solid line connected by solid triangle points represents the performance after compensation mechanism is enabled. When the signal strength is good (for example, greater than -75 dBm), the communication success rate under both modes is close to 100%, however, as the signal strength RSSI continues to weaken, the communication success rate without compensation mechanism starts to drop sharply after -80 dBm, and falls below 50% at -100 dBm. In sharp contrast, the curve with compensation mechanism always maintains a very high communication success rate throughout the RSSI interval, even under the poor signal condition of -100 dBm, the success rate still maintains at a level close to 90%, which fully proves that the compensation mechanism can significantly improve the reliability of state information interaction in a weak signal or strong interference environment.

[0043] As Fig. 3 shown, the flow starts with an idle state, when the user presses the talk key and starts the closed-loop feedback calibration at the same time, the terminal enters the state judgment, in this state, the terminal will make path selection based on a core judgment condition, if the public network signal > stable communication threshold, the terminal will start the public network voice protocol and send a beacon, and enter the public network transmission state, if the judgment result is public network signal ≤ stable communication threshold, the terminal will start the analog transmission circuit and send a beacon, and enter the analog transmission state; whether it is the public network transmission state or the analog transmission state, after the user releases the talk key, the terminal will return to the idle state, in addition, the flow chart also reveals the passive response mode of the terminal, that is, in the idle state, if a high priority instruction from the network side is received, the terminal will enter the alarm receiving state, and return to the idle state after the alarm ends, showing the autonomous behavior logic of the terminal as an intelligent decision node.

[0044] Example 4: When a walkie-talkie with a long service life and its power supply battery whose internal resistance has increased with aging is deployed in a low-temperature work environment that causes the electrochemical activity of the battery to decrease, the voltage drop of the power supply circuit when the talk key is pressed will be more significant than in the case of normal temperature and a new battery, which constitutes a challenge, i.e., a fixed hardware comparison circuit reference voltage threshold value may fail to be triggered effectively by the circuit level after the drop, resulting in a missed judgment of the communication initiation action; to address this challenge, the closed-loop feedback calibration step is configured to include an offline parameter calibration procedure and an online dynamic adjustment procedure; in the offline calibration procedure, its initial state is to equip a walkie-talkie terminal with a standard battery for calibration whose internal resistance and voltage characteristics are known, as well as a set of external data acquisition equipment capable of high-frequency current sampling and a programmable precision DC power supply; the procedure first simulates various typical battery aging and low-temperature states by setting different output voltages and series variable resistors to simulate different battery internal resistances Under each simulated state, the talk key is triggered multiple times, and the complete start-up current transient curve is captured and recorded by the data acquisition equipment through the micro-resistor sampling resistor connected in series with the walkie-talkie power supply circuit, while two key features are extracted from each curve: the peak current and the time to peak The multiple sets of , , data points collected are analyzed by multiple linear regression to establish an inversion model for characterizing the battery internal resistance state, and a simplified linear model is established as where is the estimated value of the internal resistance, and the coefficient is a calibration constant obtained from the regression analysis and fixed in the terminal firmware.

[0045] Correspondingly, the online dynamic adjustment procedure is executed in the daily use of the terminal, and the MCU of the terminal is triggered at the moment when the user presses the talk key each time, and performs a short window intensive sampling of the voltage across the micro-resistor sampling resistor with a time resolution of microseconds through its built-in analog-to-digital converter, thereby reconstructing the start-up current transient curve inside the terminal and calculating the current and values in real time from the curve; then, the MCU substitutes the two real-time characteristic values into the inversion model obtained in the aforementioned offline calibration phase to calculate the internal resistance state estimate of the current battery; next, the MCU dynamically adjusts the reference voltage threshold value of the hardware comparison circuit according to the internal resistance state estimate This adjustment logic follows the principle that the lower the battery health, the lower the reference voltage threshold should be to compensate for the voltage sag. The adjustment relationship follows a preset linear function that is also determined during the offline calibration phase. ,in and These represent the reference voltage and internal resistance under ideal new battery conditions, respectively. This is a positive adjustment factor; thus, even in low-temperature environments, when a user with an aging battery presses the talk button, although a significant voltage sag occurs in the power supply circuit, the MCU, through the aforementioned procedures and based on transient analysis of the button-activated current, has pre-calculated the voltage drop. The circuit level was adjusted to a lower level that was adapted to the current battery state, so that the circuit level after the button contact was closed could still exceed the dynamically adjusted threshold, thereby generating a valid binary status signal. Subsequent cross-domain status beacons could be sent normally, and the establishment of the communication link was not affected by the combined effects of battery aging and low temperature environment.

[0046] Example 5: To ensure the accuracy of the posture perception function in recognizing different individuals and diverse actions, an offline calibration and data filling procedure for a posture pattern library is performed before system deployment. This procedure recruits test personnel with different height and weight characteristics, who wear the walkie-talkie terminal of this invention in a controlled environment and perform a series of standard actions according to a predetermined script. This series of actions covers daily activities such as normal walking, going up and down stairs, running quickly, squatting and standing up, as well as simulated falling actions in various postures such as forward, backward and sideways. It also includes non-falling actions with high acceleration such as jumping and rapid arm swinging. During this process, the system synchronously records the carrier frequency micro-Doppler effect characteristics on the periodic synchronization beacon signal carried by the local relay gateway caused by each action, and associates these feature data with known action labels. After data augmentation and feature extraction, the data is used to fill or train the preset posture pattern library, thereby enabling the pattern library to distinguish between real abnormal falling postures and other violent and similar actions.

[0047] To make the channel health threshold in the adaptive channel compensation step Capable of accurately matching the electromagnetic environment of a specific work site, when the local relay gateway is deployed for the first time in a new scenario, a pre-deployment calibration procedure is performed. In this procedure, technicians first place the local relay gateway in the center of the work area or at a predetermined location. Then, holding a reference terminal, they move along a path covering the entire predetermined communication range. The reference terminal continuously receives and records the received signal strength indication of the standardized low-power probe signals periodically transmitted by the local relay gateway. At the same time, the background electromagnetic noise floor intensity in the corresponding frequency band at the same path in the operation site is measured synchronously using a spectrum analyzer, and the difference between the value at different position points and the background noise floor intensity is compared and analyzed The value of the specific scene is finally set as a value added to the maximum background noise floor intensity measured, with a predetermined difference, to ensure that the triggering of the time-frequency diversity compensation mechanism is based on the effective judgment of real channel quality degradation, rather than the misjudgment of normal environmental noise.

[0048] In order to avoid the influence of manufacturing tolerance of different batches of components on the consistency of system performance, a standardized pre-delivery self-calibration and parameter solidification procedure is performed after the final assembly of each fusion communication terminal. In this procedure, the terminal is placed in an automated test platform integrated with a precision manipulator and a power supply control unit. The platform first performs several complete charge and discharge cycles on the terminal to avoid the first effect of the new battery. Then, the manipulator repeatedly triggers the talk button with a preset combination of different pressures, speeds and contact durations. The terminal synchronously records the circuit level duration generated by each trigger, and based on these statistical data, calculates and solidifies a shortest effective call duration adapted to the mechanical and electrical characteristics of this particular terminal, which is used for the jitter filtering operation in the subsequent state aggregation step. After the button calibration, the test platform places the terminal's battery in several standardized states of charge, and drives the terminal to perform a transient high-current discharge in each state. By synchronously recording the starting current transient curve and the actual battery state parameters, the coefficients in the inversion model and adjustment function in the closed-loop feedback calibration step are fine-tuned to generate a set of calibration coefficients specific to this terminal, which are written into the terminal's non-volatile memory.

[0049] ​To ensure the communication reliability of the system when the key infrastructure fails, a set of online link fault-tolerant and mode switching logic based on heartbeat monitoring is integrated in the firmware of the converged communication terminal. The local trunking gateway is configured to transmit a standardized and low-power heartbeat beacon signal on the local broadcast channel at a fixed period during its idle communication time slots, while each terminal continuously monitors the heartbeat beacon in the background and maintains a heartbeat loss counter. When the terminal accumulates a count value that reaches a preset fault-tolerant upper limit within a continuous period of time, the logic controller of the terminal determines that the local trunking gateway is offline or unreachable, and automatically switches its communication mode from the default aggregated mode of reporting the status via local broadcast to a standby direct beacon transmission mode. In this standby mode, when the user presses the talk key, the terminal will no longer attempt to perform local broadcast through the second wireless communication module, but will directly trigger its public network communication module to send a standardized uplink resource scheduling request signaling to the public network side. Subsequently, if the terminal stably receives the heartbeat beacon signal again, it will automatically switch back to the aggregated mode to restore the communication efficiency of the system in high-density scenarios.

[0050] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application.

[0051] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A method for integrated communication between analog signal walkie-talkies and public network walkie-talkies, characterized in that, Includes the following steps: Step a, the state perception step, uses a hardware comparison circuit that is directly connected to the physical circuit of the voice control button of an analog signal walkie-talkie. At the moment the voice control button is pressed, without performing any analog-to-digital conversion or encoding processing of the voice signal, it directly detects the change in the level state of the physical circuit to generate a binary state signal that is uniquely determined by the change in the level state, representing the initiation or termination of communication. Step b, signaling mapping step, in the public network communication module of the walkie-talkie, the level state representing the communication initiation in the binary state signal is mapped to a standardized uplink resource scheduling request signaling that does not carry user data, defined in the physical uplink control channel of the public network communication protocol; Step c, scheduling strategy steps: When the talk button is pressed, the walkie-talkie terminal selects and executes a scheduling strategy based on the signal coverage strength of the public network it is in, among the communication medium, information processing flow, and network resource allocation method. Step d, beacon transmission step: When the walkie-talkie terminal selects a scheduling strategy, it triggers the public network communication module to send a standardized uplink resource scheduling request signaling to the public network side. The successful transmission of the request signaling serves as a cross-domain status beacon simulating that the channel has been occupied. After the network-side converged scheduling platform detects the cross-domain status beacon, it executes the scheduling strategy. In step c, the scheduling strategy executed by the walkie-talkie terminal includes: when the talk button is pressed, the terminal first determines whether the public network signal coverage strength of its location is higher than a preset stable communication threshold; if the determination result is yes, it selects to start the public network voice information protocol for voice transmission, and keeps the analog signal transmission circuit of the analog walkie-talkie in an inactive state, while sending a cross-domain status beacon; if the determination result is no, it selects to start the analog signal transmission circuit for voice transmission, and regardless of the voice transmission path selected, the terminal sends a cross-domain status beacon. In step d, the scheduling strategy executed by the network-side converged scheduling platform includes: when no cross-domain status beacon is detected, the bridging gateway function used for recording and forwarding analog voice signals remains off; and after a cross-domain status beacon is detected, the bridging gateway function is activated.

2. The method for integrated communication between analog signal walkie-talkies and public network walkie-talkies according to claim 1, characterized in that, The hardware comparison circuit in step a is a voltage comparator circuit, whose input terminal is connected to the physical contact of the voice control button, and is used to detect the voltage step change generated when the physical contact is closed or opened.

3. The method for integrated communication between analog signal walkie-talkies and public network walkie-talkies according to claim 1, characterized in that, Before beacon transmission, the process includes: a local broadcast step, whereby the walkie-talkie terminal, after generating a binary status signal, broadcasts the status signal containing its unique identifier locally via a second wireless communication module; a status aggregation step, whereby a local relay gateway receives and aggregates status signals from one or more walkie-talkie terminals within a preset time window to generate a status terminal list containing the unique identifiers of all terminals that have initiated communication; and the beacon transmission step in step c is executed by the local relay gateway, whose signaling to the public network side carries the status terminal list.

4. The method for integrated communication between analog signal walkie-talkies and public network walkie-talkies according to claim 3, characterized in that, The local relay gateway also performs the following adaptive channel compensation steps: during its communication idle time slots, it periodically transmits a standardized low-power probe signal and analyzes the response characteristics of the probe signal to obtain a received signal strength indication characterizing the current local broadcast channel quality. When the received signal strength indicator Less than a preset channel health threshold At that time, that is If this occurs, a time-frequency diversity compensation mechanism is triggered, which copies the state terminal list into two data packets and repeatedly transmits them on two or more preset different frequency points and different time slots.

5. The method for integrated communication between analog signal walkie-talkies and public network walkie-talkies according to claim 1, characterized in that, The following closed-loop feedback calibration steps are also included: at the instant the talk button is pressed, a micro-resistor sampling resistor connected in series with the talk button's power supply circuit is used to capture and analyze the transient curve of the start-up current of the talk button's power supply circuit within a preset microsecond time window; based on the peak current magnitude and the time to reach the peak value of the transient curve, the internal resistance state characterizing the health of the walkie-talkie's power supply battery is retrieved from a preset mapping relationship stored in the walkie-talkie terminal; and the reference voltage threshold of the hardware comparison circuit in step a is dynamically adjusted according to the internal resistance state.

6. The method for integrated communication between analog signal walkie-talkies and public network walkie-talkies according to claim 3, characterized in that, In the state aggregation step, before generating the state terminal list, the local relay gateway also performs a jitter filtering operation to filter out state signals received within the time window that have a duration shorter than a preset minimum effective call duration from the data to be aggregated.

7. The method for integrated communication between analog signal walkie-talkies and public network walkie-talkies according to claim 3, characterized in that, The method also includes the following steps for personnel posture perception: the second wireless communication module of the walkie-talkie terminal continuously receives periodic synchronization beacon signals broadcast from the local relay gateway during its communication idle period; the walkie-talkie terminal analyzes the micro-Doppler effect characteristics of the carrier frequency of the synchronization beacon signal caused by the physical activity of the person holding the walkie-talkie terminal, and extracts the pattern representing the person's posture from the time-domain variation spectrum of the characteristics by matching it with a preset posture pattern library; and triggers the transmission of a high-priority alarm message when the pattern matches a preset abnormal fall posture.

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