Road and Tunnel Emergency Call System Using Power-State-Based Mobile Terminal Selection

Abstract

The present invention relates to a road and tunnel emergency call system using a mobile terminal selection based on power status. For example, the system includes an emergency call terminal (100) installed in a road or tunnel. In a road and tunnel emergency call system for transmitting emergency reporting information to an external control system (300) via a mobile terminal (200) in the event of an accident or fire in an environment where power input and communication environments are limited, the emergency call terminal (100) comprises: a power supply unit (110) that supplies power including at least one of a battery or an external power source; a power management unit (130) that determines the current power status as one of a normal state, a reduced state, or a critical state based on at least one of the remaining battery level of the power supplied from the power supply unit, whether an external power source is input, or the power consumption state; an event detection unit (130) that detects the occurrence of an emergency event based on a user's emergency call input or an accident / fire detection sensor signal; and data that generates an internal reference time based on the time of occurrence of the emergency event and stores at least one of voice data related to the emergency event, type information of the accident or fire, and sensor-based danger state information based on the reference time. The present invention includes a storage unit (140) and a transmission control unit (150) that performs wireless communication with a plurality of mobile terminals passing through the road or tunnel, selects a mobile terminal suitable for transmitting emergency report information among the mobile terminals, and controls the transmission of emergency report information stored in the data storage unit to an external control system through the selected mobile terminal. According to the present invention, even in road and tunnel environments where power supply and communication environments are limited, the transmission strategy for emergency report information is dynamically changed according to the power status, and by selecting the mobile terminal with the highest probability of reporting success among the plurality of mobile terminals (200) and transmitting the emergency report information, the possibility of reporting failure is reduced and system reliability is improved.

Description

Technology Field

[0001] Embodiments of the present invention relate to an emergency telephone system installed in roads and tunnels. More specifically, in the event of an accident or fire in a road or tunnel environment where power supply and communication environments are limited, the system changes the transmission strategy of emergency reporting information according to the power status and selects a mobile terminal among a plurality of mobile terminals with a high probability of successful reporting to transmit the emergency reporting information. This relates to a road and tunnel emergency call system using power status-based mobile terminal selection. Background Technology

[0002] Roads and tunnels are areas where emergencies such as traffic accidents, vehicle fires, and congestion can frequently occur; therefore, prompt reporting and communication with the control system are essential in the event of an accident. To this end, fixed emergency telephone terminals are installed and operated in roads and tunnels to allow users to report emergencies directly.

[0003] However, in areas where commercial power supply is limited or communication environments are unstable, such as inside tunnels or mountain roads, emergency call terminals operate on a battery basis or rely on limited wireless communication. Consequently, in the event of an accident or fire, problems may arise where the emergency call terminal fails to function properly or fails to connect with the control system, preventing the transmission of the report.

[0004] Furthermore, conventional emergency call systems are often configured based on a single wired or wireless communication path, so there is a high probability that the transmission of emergency reports will fail if a failure occurs in that path or if the power condition deteriorates.

[0005] While low-power modes or function limitations are applied in some systems, these are merely measures to reduce power consumption and do not provide a structure that changes the reporting strategy itself depending on the power status.

[0006] Therefore, there is a continuous demand for a new emergency telephone system that can systematically improve the likelihood of successful transmission of emergency reports, even in road and tunnel environments where power and communication conditions are limited. Prior art literature

[0007] Registered Patent Publication No. 10-2905424 (Publication Date: Dec. 31, 2025) Registered Patent Publication No. 10-1375285 (Publication Date: Mar. 17, 2014) The problem to be solved

[0008] The objective of the present invention is to solve the aforementioned problems by providing a road and tunnel emergency call system using power state-based mobile terminal selection that, even in road and tunnel environments where power input and communication environments are limited, dynamically changes the transmission strategy of emergency report information according to the power state and selects the mobile terminal with the highest probability of successful reporting among a plurality of mobile terminals to transmit the emergency report information, thereby reducing the possibility of reporting failure and improving system reliability. second It is to provide.

[0009] In addition, another objective of the present invention is to efficiently utilize limited power resources and secure the operating duration of the emergency call terminal by selectively transmitting only the core information essential for establishing a report even in critical power conditions. means of solving the problem

[0010] A road and tunnel emergency call system using a power status-based mobile terminal selection according to an embodiment of the present invention includes an emergency call terminal fixedly installed on a road or tunnel, and relates to a road and tunnel emergency call system for transmitting emergency report information to an external control system in the event of an accident or fire in an environment where power input and communication environments are limited. Herein, the emergency call terminal comprises: a power supply unit that supplies power including at least one of a battery or an external power source; a power management unit that determines the current power status as one of a normal state, a reduced state, or a critical state based on at least one of the remaining battery charge of the power supplied from the power supply unit, whether an external power source is input, or the power consumption state; an event detection unit that detects the occurrence of an emergency event based on a user's emergency call input or an accident / fire detection sensor signal; and a data storage unit that generates an internal reference time based on the time of occurrence of the emergency event and stores at least one of voice data related to the emergency event, information on the type of accident or fire, and sensor-based risk state information based on the reference time.The transmission control unit performs wireless communication with a plurality of mobile terminals passing through the road or tunnel, selects a mobile terminal among the mobile terminals suitable for transmitting emergency report information, and controls the transmission of emergency report information stored in the data storage unit to an external control system through the selected mobile terminal. The transmission control unit collects mobile terminal status information regarding at least one of the following: elapsed time since the point in time when the mobile terminal entered the wireless communication range, time of stay within the wireless communication range calculated based on at least one of changes in wireless signal strength or movement speed information, whether a wireless communication link is connected, whether data transmission and reception is successful or the link maintenance status, and a state of connectivity to a control system determined based on whether the mobile terminal supports a communication network capable of connecting to an external control system or a past connection history with an external control system; changes the item prioritized among the mobile terminal status information according to the power status determined by the power management unit; calculates the relative suitability for transmitting emergency report information by comparing the mobile terminals with each other based on the changed priority item; and, based on the relative suitability, designates one of the plurality of mobile terminals as a mobile terminal for transmitting emergency report information. Selected, and when the power state is a critical state where the remaining battery level is below a preset threshold or there is no external power input, the control is characterized by selectively transmitting only predefined core information consisting of at least one of the following: information on the time of occurrence of an emergency event, information on the type of accident or fire, a portion of the emergency call voice immediately after the event occurs, and danger state information detected by a sensor, among the emergency report information stored in the data storage unit.

[0011] The transmission control unit is configured to set the time spent within the wireless communication range among the mobile terminal status information as a priority consideration item when the power status is in a normal state, and to set the status of connectivity to an external control system among the mobile terminal status information as a priority consideration item when the power status is in a critical state, and if there are multiple mobile terminals satisfying the priority consideration item, to apply a communication status indicating whether the wireless communication link is connected, whether data transmission and reception is successful, or the link maintenance status as an additional comparison criterion to compare the mobile terminals step by step, thereby finally selecting one mobile terminal with the highest relative suitability for transmitting emergency report information; when the mobile terminal is selected, the transmission control unit calculates the amount of data that can be transmitted based on the communication time standard based on the time spent within the wireless communication range of the selected mobile terminal, sets the amount of data allowed for transmission according to the power status determined by the power management unit, determines the smaller value between the amount of data that can be transmitted based on the communication time standard and the amount of data allowed for transmission as the actual transmission range, and when the power status is in a critical state, the transmission control unit [determines] information on the time of occurrence of the emergency event, information on the type of accident or fire, a portion of the emergency call voice immediately after the event occurs, and danger state information detected by a sensor within the actual transmission range. It is characterized by controlling the transmission of predefined core information composed of at least one of the following in order to be selected preferentially. Effects of the invention

[0012] According to the present invention, by dynamically changing the transmission strategy of emergency report information according to the power status, the possibility of failure to transmit emergency reports can be effectively reduced even in road and tunnel environments where power and communication environments are limited.

[0013] In addition, by selecting a mobile terminal with a high probability of successful reporting among multiple mobile terminals and transmitting emergency reporting information, the reliability of reporting can be significantly improved compared to conventional technology that relies on a single communication path.

[0014] In addition, by selectively transmitting only the core information essential for establishing a report even when the power status is critical, it prevents unnecessary power consumption and provides the effect of increasing the operating duration of the emergency call terminal. Brief explanation of the drawing

[0015] FIG. 1 is a block diagram showing the overall configuration of a road and tunnel emergency call system using power status-based mobile terminal selection according to an embodiment of the present invention. Figure 2 is a block diagram showing the internal configuration of the emergency telephone terminal illustrated in Figure 1. FIG. 3 is a flowchart illustrating a procedure for selecting a mobile terminal according to a power state in an embodiment of the present invention. FIG. 4 is a flowchart illustrating a procedure for determining the transmission range of emergency reporting information by considering the power status and communication availability time in an embodiment of the present invention. Specific details for implementing the invention

[0016] The terms used in this specification will be briefly explained, and the invention will be described in detail.

[0017] The terms used in this invention have been selected based on currently widely used general terms, taking into account their functions within the invention; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant description of the invention. Therefore, the terms used in this invention should be defined not merely by their names, but based on their meanings and the overall content of the invention.

[0018] When a part of a specification is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part" or "module" as used in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware or software, or as a combination of hardware and software.

[0019] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In this description, each component is described by the reference numeral, and the same reference numeral denotes the same component.

[0021] FIG. 1 is a block diagram showing the overall configuration of a road and tunnel emergency telephone system using power state-based mobile terminal selection according to an embodiment of the present invention, FIG. 2 is a block diagram showing the internal configuration of an emergency telephone terminal shown in FIG. 1, FIG. 3 is a flowchart for explaining a procedure for selecting a mobile terminal according to a power state in an embodiment of the present invention, and FIG. 4 is a flowchart for explaining a procedure for determining the transmission range of emergency reporting information by considering the power state and communication time in an embodiment of the present invention.

[0022] As illustrated in FIG. 1, the road and tunnel emergency call system (10) using the power status-based mobile terminal selection of the present invention includes an emergency call terminal (100) fixedly installed on a road or tunnel, a plurality of mobile terminals (200) capable of wireless communication with the emergency call terminal (100), and an external control system (300) that receives emergency report information through the mobile terminals (200).

[0023] The emergency telephone terminal (100) functions as a subject for generating emergency report information when an emergency event such as an accident or fire occurs and transmitting it to an external control system (300).

[0024] The mobile terminal (200) can be implemented in multiple units (#1, #2, #3), such as a communication terminal mounted on a vehicle, a patrol vehicle terminal, a maintenance terminal, or a mobile communication device, and can communicate with the emergency phone terminal (100) within a wireless communication range.

[0025] In the present invention, the road and tunnel emergency call system (10) using power status-based mobile terminal selection is configured to transmit emergency report information by selecting the most suitable mobile terminal (200) based on the power status and status information of the mobile terminal (200) at the time of the emergency event, without fixing the communication path for transmitting emergency report information in advance.

[0026] Accordingly, even in the same installation environment, different report transmission paths can be dynamically formed depending on the power status, the distribution status of mobile terminals, or the communication environment.

[0027] This configuration is clearly distinct from conventional emergency telephone systems that rely on a single wired or fixed wireless path, and systematically improves the likelihood of successful transmission of emergency reports even in road and tunnel environments where power and communication are limited.

[0028] Referring to FIG. 2, the emergency phone terminal (100) includes a power supply unit (110), a power management unit (120), an event detection unit (130), a data storage unit (140), a transmission control unit (150), and a wireless unit (160).

[0029] The power supply unit (110) supplies operating power to the emergency phone terminal (100), including a battery or external power.

[0030] The power management unit (120) determines the current power state to be a normal state, a reduced state, or a critical state based on at least one of the remaining battery amount supplied from the power supply unit (110), whether external power is input, or the power consumption state, and provides this power state to the transmission control unit (150). The reduced state is an intermediate state between the normal state and the critical state, and the criteria for selecting a mobile terminal are applied in the same way as in the normal state, but the amount of data allowed for transmission is set more restrictively than in the normal state.

[0031] The event detection unit (130) detects the occurrence of an emergency event based on the user's emergency call input or accident and fire detection sensor signals, sets the time of the emergency event occurrence as a reference time, and transmits it to the data storage unit (140) and the transmission control unit (150).

[0032] The data storage unit (140) stores at least one of voice data related to an emergency event, type information of an accident or fire, and sensor-based risk status information based on the above reference time, and manages the stored emergency report information so that it can be divided into a core section immediately after the event occurs and a subsequent section.

[0033] The transmission control unit (150) communicates with a plurality of mobile terminals (200) through the wireless unit (160) to collect mobile terminal status information, selects a mobile terminal (200) according to the power status determined by the power management unit (120), and controls the transmission of emergency report information stored in the data storage unit (140) to an external control system (300) through the selected mobile terminal (200).

[0034] Referring to FIG. 3, the mobile terminal selection operation according to the present invention is performed starting from the occurrence of an emergency event. Hereinafter, the term "stay time" refers to the stay time within the wireless communication range calculated or estimated based on information obtained during the wireless communication process.

[0035] First, when an emergency event is detected by the event detection unit (130), the power management unit (120) determines the current power status based on at least one of the remaining battery level input from the power supply unit (110), whether external power is input, or the power consumption status (S11). The transmission control unit (150) receives the power status determined by the power management unit (120) and sets the selection criteria to be applied in the subsequent mobile terminal selection process.

[0036] Afterwards, the transmission control unit (150) collects mobile terminal status information from a plurality of mobile terminals (200) existing within the wireless communication range through the wireless unit (160) (S12).

[0037] When the power state is normal, the transmission control unit (150) sets the time spent within the wireless communication range among the mobile terminal status information as a priority consideration item, and when the power state is critical, sets the state of being able to connect with the external control system (300) as a priority consideration item (S13).

[0038] The transmission control unit (150) compares the mobile terminals (200) with each other based on a set priority consideration item, and if there are multiple mobile terminals (200) that satisfy the priority consideration item, it applies the communication status as an additional comparison criterion and compares the mobile terminals (200) step by step (S14) to select one mobile terminal (200) that is most suitable for transmitting emergency report information (S15).

[0039] More specifically, in the present invention, when an emergency event occurs, the event detection unit (130) of the emergency telephone terminal (100) detects the occurrence of the emergency event, sets the time of the emergency event occurrence as a reference time, and transmits it to the transmission control unit (150). The power management unit (120) determines the current power status based on at least one of the remaining battery level input from the power supply unit (110), whether external power is input, or the power consumption status, and provides the determined power status to the transmission control unit (150).

[0040] The transmission control unit (150) collects mobile terminal status information from a plurality of mobile terminals (200) existing within a wireless communication range through the wireless unit (160). At this time, the mobile terminal status information includes the elapsed time since the time the mobile terminal (200) entered the wireless communication range, the time of stay within the wireless communication range calculated based on at least one of the change in wireless signal strength or the movement speed information, the communication status indicating whether a wireless communication link is connected, whether data transmission and reception was successful or the link maintenance status, and the control system connection capability status determined based on whether the mobile terminal (200) supports a communication network capable of connecting to an external control system (300) or the past connection history with the external control system (300).

[0041] The transmission control unit (150) sets the time spent within the wireless communication range among the mobile terminal status information as a priority consideration item when the power status determined by the power management unit (120) is a normal state, and sets the state of being able to connect to the control system as a priority consideration item when the power status is a critical state. The transmission control unit (150) compares the mobile terminals (200) with one another based on the priority consideration item, and if there are multiple mobile terminals (200) that satisfy the priority consideration item, it applies the communication status as an additional comparison criterion and compares the mobile terminals (200) step by step, thereby finally selecting one mobile terminal (200) with the highest relative suitability for transmitting emergency report information. Here, relative suitability refers to the relative priority based on the result of comparing the mobile terminals with one another, and does not necessarily include numerical calculation.

[0042] By this operation, the transmission control unit (150) can select the mobile terminal (200) that is most suitable for the power state and mobile terminal state at the time of the emergency event.

[0043] Referring to FIG. 4, after a mobile terminal (200) is selected by the mobile terminal selection operation of FIG. 3, the transmission control unit (150) checks the expected stay time during which the selected mobile terminal (200) is expected to remain within the wireless communication range (S21), and calculates the amount of data that can be transmitted during the communication time based on this (S22). At the same time, the power management unit (120) sets the amount of data that can be transmitted and used for transmitting emergency report information according to the current power status (S23), and provides this to the transmission control unit (150).

[0044] The transmission control unit (150) compares the amount of data available for transmission calculated based on communication time with the amount of data allowed for transmission set according to the power status, and determines the smaller of the two values ​​as the actual transmission range (S24). When the power status is in a critical state, the transmission control unit (150) controls the transmission to prioritize the selection of predefined core information within the actual transmission range, which consists of at least one of the following: information on the time of occurrence of an emergency event, information on the type of accident or fire, a portion of the emergency call voice immediately after the event occurs, and information on the danger state detected by a sensor, and transmits it to an external control system (300) (S25). Accordingly, information essential for establishing a report can be transmitted prioritized even in a limited power and communication environment.

[0045] When the transmission control unit (150) confirms that the transmission of core information is completed in step S25 or that the transmission of data corresponding to the actual transmission range determined in step S24 has ended, it provides a transmission completion signal to the power management unit (120) to control the operation mode of the emergency call terminal (100) to switch to a power saving mode (S26).

[0046] The power management unit (120) responds to a transmission completion signal to reduce the transmission output or transmission / reception operation cycle of the wireless unit (160) or switch the wireless unit (160) to a standby state, limits the function that causes high-power operation of the transmission control unit (150), and controls the data storage unit (140) to store transmission history information including the transmission completion time, selected mobile terminal (200) identification information, type of transmitted core information, and transmission result status, thereby minimizing unnecessary power consumption after transmission.

[0047] Additionally, the power management unit (120) may set at least one of the following as a power saving release condition: when an emergency call input from the event detection unit (130) or an accident / fire detection sensor signal occurs in the power saving mode, or when re-entry of the mobile terminal (200) is detected or a retransmission request signal is received through the wireless unit (160). When the power saving release condition is satisfied, the emergency call terminal (100) may be restored to a normal operating state and the procedure of FIGS. 3 and FIGS. 4 may be resumed. Accordingly, the present invention can preserve the remaining power of the terminal even after the transmission of emergency report information is completed to prepare for additional emergency events, and can improve the possibility of continuous operation of the system in a critical power state environment.

[0048] More specifically, in the present invention, after a mobile terminal (200) is selected according to the operation of FIG. 3, the transmission control unit (150) calculates the amount of data that can be transmitted based on the communication time and the time spent within the wireless communication range of the selected mobile terminal (200). At the same time, the power management unit (120) sets the amount of data that can be transmitted and used for transmitting emergency report information according to the current power status, and provides this to the transmission control unit (150).

[0049] The transmission control unit (150) compares the amount of data that can be transmitted based on the communication time with the amount of data that is allowed to be transmitted, and determines the smaller of the two values ​​as the actual transmission range. When the power state is in a normal state, a relatively wide transmission range may be set, and when the power state is in a critical state, the actual transmission range is set restrictively.

[0050] When the power status is determined to be critical, the transmission control unit (150) preferentially selects and transmits to an external control system (300) at least one of the following: information on the time of occurrence of an emergency event, information on the type of accident or fire, a portion of the emergency call voice immediately after the event occurs, and information on the danger state detected by a sensor, among the emergency report information stored in the data storage unit (140) within the actual transmission range.

[0051] Through such operation, the present invention ensures that information essential for establishing a report is transmitted preferentially even in situations where power conditions are limited, thereby minimizing power consumption while improving the probability of successful transmission of emergency reports.

[0052] Below, as an example, we will examine the dynamic change of the report transmission path according to the power status.

[0053] Assume that an emergency event occurs due to a fire detection sensor in an emergency telephone terminal (100) installed inside a tunnel. When the power management unit (120) determines that the battery level is sufficient and the normal state is established, the transmission control unit (150) sets a mobile terminal (200) with a relatively long stay time within the wireless communication range as a priority consideration item and controls the transmission of a relatively large amount of emergency report information to an external control system (300) through the mobile terminal (200).

[0054] On the other hand, if the power management unit (120) determines a critical state where the remaining battery level is below a threshold value at the same location, the transmission control unit (150) sets the possibility of connection with the external control system (300) as a priority consideration item rather than the dwell time. Accordingly, a mobile terminal (200) with a high possibility of connection with the control system can be selected even if the dwell time is short.

[0055] At this time, the transmission control unit (150) does not determine the report transmission path based solely on the presence or absence of the mobile terminal (200), but rather selects the mobile terminal (200) most suitable for reporting by comprehensively considering the power status and mobile terminal status information at the time of the emergency event occurrence. That is, even if multiple mobile terminals (200) exist within the same tunnel section, the criteria for selecting the mobile terminal (200) may differ depending on whether the power status is in a normal state or a critical state.

[0056] For example, when the power state is in a normal state, the transmission control unit (150) can transmit voice data related to emergency events and accident situation information to the external control system (300) in a relatively sufficient amount by selecting a mobile terminal (200) with a relatively long stay time within the wireless communication range. On the other hand, when the power state is in a critical state, a mobile terminal (200) with a low probability of connection to the external control system (300) even if the stay time is long may not be selected, and a mobile terminal (200) with a high probability of connection to the control system (300) even if the stay time is short may be selected preferentially.

[0057] In this way, the present invention is clearly distinguished from conventional fixed communication path-based emergency telephone systems in that it adopts a report transmission structure utilizing a mobile terminal (200), but does not use the mobile terminal in a fixed manner, and dynamically reconstructs the report transmission path according to the power status and mobile terminal status at the time of the emergency event.

[0058] In addition, as another embodiment, we will examine the case of power conservation through the selective transmission of key information.

[0059] When the power state is determined to be a critical state, the transmission control unit (150) calculates the amount of data that can be transmitted based on the residence time of the selected mobile terminal (200) and determines the actual transmission range by comparing it with the amount of data allowed to be transmitted according to the power state.

[0060] In this case, the transmission control unit (150) selects only the core information, consisting of the time of occurrence of the emergency event, the type of accident or fire, and a portion of the emergency call voice immediately after the event occurs, from the emergency report information stored in the data storage unit (140), and transmits it to the external control system (300). Accordingly, information essential for establishing a report is transmitted first even in situations where the power condition is limited, and unnecessary power consumption is prevented.

[0061] As described above, the present invention is configured such that mobile terminal selection criteria, mobile terminal comparison procedure, transmission range determination, and transmission target information are organically linked with respect to the power management unit (120), thereby enabling the implementation of mobile terminal selection and core information selective transmission functions based on power status.

[0062] Additionally, when the power status is determined to be critical, the transmission control unit (150) does not set the entire emergency report information stored in the data storage unit (140) as a transmission target, but controls the transmission to select and transmit only the information directly necessary for the establishment of the report. At this time, the core information may be predefined as information on the time of occurrence of the emergency event, information on the type of accident or fire, information on the danger state detected by the sensor, or a portion of the emergency call voice immediately after the event occurs.

[0063] The transmission control unit (150) calculates the amount of data that can be transmitted based on the time spent within the wireless communication range of the selected mobile terminal (200), and determines the actual transmissionable range by comparing it with the amount of data allowed to be transmitted according to the power status. Subsequently, the transmission control unit (150) controls the transmission order so that the core information is included preferentially within the actual transmission range.

[0064] Accordingly, even in situations where the power supply is limited, the external control system (300) can quickly recognize the occurrence and type of an accident or fire and secure minimal information for additional response instructions. At the same time, by suppressing unnecessary data transmission, the remaining power of the emergency telephone terminal (100) is preserved, and preparations can be made for additional emergency events that may occur later.

[0065] The above description is merely one embodiment for implementing a road and tunnel emergency call system using power status-based mobile terminal selection according to the present invention. The present invention is not limited to the above embodiment, and the technical spirit of the present invention extends to the scope in which various modifications can be made by anyone with ordinary knowledge in the field to which the invention belongs, without departing from the gist of the invention as claimed in the following patent claims. Explanation of the symbols

[0066] 10: Road and Tunnel Emergency Call System Using Power Status-Based Mobile Terminal Selection 100: Emergency call terminal 110: Power supply 120: Power Management Unit 130: Event detection unit 140: Data storage unit 150: Transmission control unit 160: Wireless section 200: Mobile terminal 300: External Control System

Claims

Claim 1 A road and tunnel emergency telephone system for transmitting emergency reporting information to an external control system in the event of an accident or fire in an environment where power input and communication environments are limited, comprising an emergency telephone terminal fixedly installed in a road or tunnel, wherein the emergency telephone terminal comprises: a power supply unit that supplies power including at least one of a battery or an external power source; a power management unit that determines the current power state as one of a normal state, a reduced state, or a critical state based on at least one of the remaining battery charge of the power supplied from the power supply unit, whether an external power source is input, or the power consumption state; an event detection unit that detects the occurrence of an emergency event based on a user's emergency call input or an accident / fire detection sensor signal; and a data storage unit that generates an internal reference time based on the time of occurrence of the emergency event and stores at least one of voice data related to the emergency event, information on the type of accident or fire, and sensor-based risk state information based on the reference time. The transmission control unit performs wireless communication with a plurality of mobile terminals passing through the road or tunnel, selects a mobile terminal suitable for transmitting emergency report information among the mobile terminals, and controls the transmission of emergency report information stored in the data storage unit to an external control system through the selected mobile terminal, wherein the transmission control unit collects mobile terminal status information regarding at least one of the elapsed time since the point in time when the mobile terminal entered the wireless communication range, the time of stay within the wireless communication range calculated based on at least one of the change in wireless signal strength or movement speed information, the status of a wireless communication link connection, the success of data transmission and reception or the link maintenance status, and the status of a control system connection capability determined based on whether the mobile terminal supports a communication network capable of connecting to an external control system or the history of past connection with an external control system, and according to the power status determined by the power management unit,The item prioritized among the mobile terminal status information is changed, and the mobile terminals are compared with each other based on the changed priority item to calculate the relative suitability for transmitting emergency report information. Based on the relative suitability, one mobile terminal among the plurality of mobile terminals is selected as the mobile terminal for transmitting emergency report information. When the power status is a critical state where the remaining battery level is below a preset threshold or there is no external power input, control is made to selectively transmit only predefined core information consisting of at least one of the following: information on the time of occurrence of an emergency event, information on the type of accident or fire, a portion of the emergency call voice immediately after the event occurs, and danger status information detected by a sensor, among the emergency report information stored in the data storage unit. The transmission control unit sets the time spent within the wireless communication range among the mobile terminal status information as a priority item when the power status is normal, and sets the status of being able to connect to an external control system among the mobile terminal status information as a priority item when the power status is critical. If there are multiple mobile terminals satisfying the priority item, the communication status indicating whether the wireless communication link is connected, whether data transmission and reception is successful, or the link maintenance status is applied as an additional comparison criterion to the mobile terminals stepwise By comparison, the system is configured to finally select one mobile terminal with the highest relative suitability for transmitting emergency report information, and when the mobile terminal is selected, the amount of data that can be transmitted based on communication time is calculated based on the time spent within the wireless communication range of the selected mobile terminal, and the amount of data that can be transmitted is set according to the power status determined by the power management unit, and the smaller value between the amount of data that can be transmitted based on communication time and the amount of data that can be transmitted is determined as the actual transmission range, and if the power status is a critical state, information on the time of occurrence of an emergency event within the actual transmission range,Controls to preferentially select and transmit predefined core information consisting of at least one of the following: information on the type of accident or fire, a portion of the emergency call voice immediately after the event occurs, and danger state information detected by a sensor; when the transmission of the core information is completed or the transmission of data corresponding to the actual transmission range is terminated, controls to provide a transmission completion signal to the power management unit to switch the operating mode of the emergency call terminal to a power saving mode; the power management unit controls to reduce the transmission output or transmission / reception operation cycle of the wireless unit or switch the wireless unit to a standby state in response to the transmission completion signal, and controls to store transmission history information including the transmission completion time, selected mobile terminal identification information, the type of transmitted core information, and the transmission result status in the data storage unit; sets at least one of the following as a power saving release condition: when an emergency call input or an accident / fire detection sensor signal occurs in the event detection unit while in the power saving mode, when re-entry of the mobile terminal is detected through the wireless unit, or when a retransmission request signal is received; and when the power saving release condition is satisfied, returns the emergency call terminal to a normal operating state to determine the power state, collect the mobile terminal state information, A road and tunnel emergency telephone system using power state-based mobile terminal selection, characterized by controlling to resume the selection of the mobile terminal and the transmission procedure of the emergency report information. Claim 2 delete

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