JP2002009686A - Mobile communication system having transmission- reception function of emergency signal, portable terminal, base station and center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication system which can aid in search and rescue of a victim and improves the life-saving efficiency by eliminating radio interference to a base station and specifying the position of the victim through simple terminal operations, inside and outside the communication range of the base station, while using a portable terminal such as a cellular phone and a PHS. SOLUTION: An emergency signal transmission mechanism, which can transmit emergency signals 9 even if it is located at the outside of communication range of each base station is added to a portable terminal. Each of base stations 2-4 has a function to receive the signals 9 and to transfer the information on signals 9 to a prescribed center 8. The center 8 has a function of receiving the signals 9 transferred from the base stations and of specifying the position of the portable terminal that transmitted the signals 9 from the identification numbers of base stations. Meanwhile, a mobile base station has a function of directly receiving the signals 9 from the portable terminal, without radiating radio waves by itself and of specifying the position of the portable terminal that transmitted the signals 9, from the received signals 9.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
When a person carrying a mobile phone such as a DMA system or a portable terminal such as a PHS encounters an emergency such as distress, the mobile communication system for specifying the position of the mobile terminal and the mobile terminal, base station, It concerns the center. 2. Description of the Related Art At present, large ships are required to be equipped with dedicated radio equipment for rescue, and it is possible to use the dedicated equipment for rescue in case of sea disaster. Ships that are not required can be used for rescue by equipping them with commercially available radios. However, dedicated radio equipment and commercially available radio equipment are large in size and mass,
They also require wireless licenses, are more expensive and have not spread. On the other hand, with respect to mobile phones and PHSs which are mobile communications for personal use, it is possible for a victim to call a third party by dialing and notify the situation by voice to seek rescue. However, mobile phones and P
HS and the like cannot radiate radio waves from terminals unless they are within the communication range of the base station. SUMMARY OF THE INVENTION The present invention utilizes an inexpensive portable terminal such as a mobile phone and a PHS, which are not widely used, require no license, and are used for searching for victims.
Movement that eliminates radio wave interference to the base station and identifies the position of the victim by simple terminal operation within and outside the communication range of the base station to support search and rescue and improve the efficiency of lifesaving It is an object of the present invention to provide a body communication system and device. [0004] PDC system, various CDM
In mobile communication systems for mobile phones such as A-type mobile phones and PHS, etc., an emergency signal is transmitted by an operation from the mobile terminal side even when the mobile terminal is outside the communication range as well as within the base station communication range. A mobile terminal having an emergency signal transmission mechanism for transmitting an emergency signal, a base station having an emergency signal relay processing mechanism capable of receiving an emergency signal from the mobile terminal and reporting to the center, and receiving an emergency signal relayed from the base station And a center having an emergency portable terminal status display mechanism for identifying the position of the portable terminal and receiving an emergency signal from the portable terminal, displaying the contents of the emergency signal and identifying the position of the portable terminal A mobile communication system comprising a mobile base station having an emergency signal reception and terminal status display mechanism. First, an outline of the present invention will be described. An emergency signal transmission operation function and an emergency signal transmission control processing function, which are emergency signal transmission mechanisms, are added to the portable terminal. The base station has a function of receiving an emergency signal and transferring the information to a predetermined center. Further, a center having a function of receiving the emergency signal transferred from the base station, specifying the position of the mobile terminal that has issued the emergency signal from the identification number of the base station, and displaying the location together with the information content of the emergency signal is installed. In addition, a function to receive an emergency signal directly from a mobile terminal without radiating radio waves, identify the position of the mobile terminal that issued the mobile terminal emergency signal based on this signal, and display it together with the information content of the emergency signal Is provided. A terminal operator performs an emergency signal transmission operation on a portable terminal in an emergency such as distress. The terminal determines whether it is within the communication range of the base station or outside the communication range, and automatically switches the communication mode thereafter. First, the case where the mobile station is within the communication range of the base station will be described below. The terminal measures its own position based on the base station identification information transmitted from the base station, the radio wave arrival status such as the reception level from the base station, and the position information of the base station stored in the terminal. Sometimes it is displayed on the display unit and stored in the terminal memory. The terminal has coded the terminal identification number, the terminal location, the communicable base station identification number and the reception level from the base station, the emergency signal transmission start time, the terminal current time, the emergency contact number, and any setting information. Generate an emergency signal. This emergency signal is transmitted to the base station using a control channel or the like. [0008] The base station having received the emergency signal transmits the signal to a predetermined center. The center performs processing such as displaying information based on the emergency signal. When the center receives the emergency signal normally, it transmits a reception completion signal to the terminal. Even when the reception of the emergency signal from the terminal is interrupted, the connection state is held and the line with the victim is preferentially held unless a disconnection operation is performed from the center side. Next, the case where the terminal is out of the communication range will be described below. The terminal generates an emergency signal obtained by encoding the identification number of the terminal, the emergency signal transmission start time, the current time of the terminal, the emergency contact number, and the optional setting information. The terminal detects an emergency signal transmission situation of the same frequency channel by a terminal other than itself. If there is no emergency signal transmission from another terminal, the subsequent transmission processing is performed. When the transmission of the emergency signal from the other terminal is detected, the regular transmission time of the other terminal is monitored, and the subsequent transmission processing is performed based on the idle time during the regular transmission interval. In the emergency signal transmission process, in the case of a terminal having a function of controlling transmission output, an emergency signal is automatically and periodically transmitted from the terminal in bursts at a maximum transmission power using a predetermined transmission interval. When the battery of the terminal is exhausted, a process for extending the transmission interval is also performed. The transmitted emergency signal is received by a mobile base station mounted on an aircraft, a ship, or the like. The mobile base station provides a plurality of reception processing capabilities to receive emergency signals on a plurality of frequency channels. The mobile base station is equipped with a plurality of omnidirectional antennas or a single directional antenna to measure the direction of arrival of radio waves. After receiving the emergency signal, the mobile base station displays the information of the emergency signal on the display unit. Further, based on the arrival direction of the emergency signal and the reception input level, the relative direction and the relative distance of the terminal are calculated and displayed. Further, in order to more accurately specify the terminal position, the mobile base station is moved, and the terminal position is calculated based on the principle of triangulation. In addition, utilizing the fact that the terminal transmits at a predetermined transmission interval, the mobile base station controls the antenna direction after receiving the emergency signal so that it can receive the emergency signal at the next terminal transmission interval. And perform other processing. On the other hand, if the same transmission interval is used and an irregular radio wave of the same frequency channel is received,
This can be eliminated as noise. An embodiment of the present invention will be described below. FIG. 1 is a system operation example diagram showing an embodiment in a communication area of a base station. In FIG. 1, the mobile terminal 1 is in a range of a base station communication maximum distance 5 to 7 between the base stations 2 to 4. Each of the base stations 2 to 4 is connected to the center 8 by a ground line. When the operator carrying the mobile terminal 1 encounters an emergency such as distress, the operation of the mobile terminal 1 is performed to transmit the emergency signal 9 to the base station 3. FIG. 2 is a system operation example diagram showing an embodiment outside the base station communication area. In FIG. 2, the mobile terminal 1 is located at a place beyond the base station communication maximum distance 6 of the base station 3. On the other hand, it indicates that the mobile base station 11 mounted on the mobile object 10 is within a range where the emergency signal 9 can be received from the mobile terminal 1. FIG. 3 is a configuration diagram of the portable terminal 1. The portable terminal 2 mainly includes a control processing unit 14, a transmission / reception processing unit 13, a display processing unit 17, an operation input unit 18, a voice input / output processing unit 1,
9, the transmission and reception processing unit 13 and the antenna 12
Via the antenna 12, it is connected to the base stations 2 to 4 in FIG. It is assumed that the main function is a normal voice call. For the configuration of the mobile terminal 2 according to the present invention,
In an emergency, an emergency signal transmission operation unit 16 that performs an operation for an operator to transmit an emergency signal, and in response to the operation instruction, performs an emergency signal transmission control process and stores coordinates of all base stations. Emergency signal transmission control processing unit 1
5 is provided. FIG. 4 is a configuration diagram of the base station 3. It is assumed that a transmission / reception processing unit 76 and a land line interface unit 79 are connected to each other centering on a control processing unit 77, and have a configuration in which a normal voice call is a main function. The base station according to the present invention is provided with an emergency signal control processing unit 78 for receiving an emergency signal transmitted from the mobile terminal 1 and performing a control process in this configuration. FIG. 5 is a block diagram of the center 8. Emergency signal control processor 81 and terrestrial line interface 8
0, a display output unit 82 and an operation input unit 83 are provided. FIG. 6 is a configuration diagram of the mobile base station 11. The reception processing units 22 and 23, the display output unit 25, the operation input unit 26, and the antennas 20 and 21 are provided around the control processing unit 24. FIG. 7 is an operation flowchart of the portable terminal 1. It mainly describes the processing of emergency signals. FIG. 8 is an operation flowchart of the base station 3.
It mainly describes the processing of emergency signals. FIG. 9 is an operation flowchart of the center 8. FIG. 10 is an operation flowchart of the mobile base station 11. As a first embodiment, an embodiment of the present invention in which a portable terminal is located within a communication area of a base station will be described with reference to the drawings. In FIG. 1, the distress who has the portable terminal 1 operates the emergency signal transmission operation unit 16 in FIG. 3 (step 28 in FIG. 7), and the antenna 12 and the transmission / reception processing unit 13
Attempt to receive radio waves from the base station (step 2 in FIG. 7).
9) The control processing unit 14 determines whether the base station receives radio waves (step 30 in FIG. 7). In this case, since the radio wave from the base station can be received, the base station identification number (step 44) included in the radio wave arriving from each of the base stations 2 to 4 and the coordinate information of all the base stations stored in the mobile terminal 1 in advance are used. Then, the emergency signal control processor 15 calculates and displays its own terminal position (step 31 in FIG. 7). Next, the terminal identification number,
An emergency signal is created by encoding the terminal position, base station identification number, base station reception level, emergency signal transmission start time, terminal current time, emergency contact information, optional setting information, and the like (step 32 in FIG. 7). Next, control is performed at a time interval of, for example, 60 seconds (step 33 in FIG. 7), and the emergency signal 9 is automatically transmitted from the portable terminal 1 (step 34 in FIG. 7). If it is determined that the emergency signal control processing unit 78 of the base station 3 has received the emergency signal 9 (step 45 in FIG. 8), the emergency signal control processing unit 78 of the base station 3 sends an instruction to the control processing unit 77,
A communication channel between the base station 3 and the portable terminal 1 is secured (step 46 in FIG. 8), and an emergency signal is transmitted to the center 8 via the terrestrial line interface unit 79 (step 47 in FIG. 8). Further, when the center 8 determines that the emergency signal has been received via the terrestrial line interface unit 80 (step 53 in FIG. 9), the emergency signal control processing unit 81 of the center 8 transmits a communication channel between the center 8 and the base station 3. (Step 54 in FIG. 9). Next, the emergency signal control processing unit 81 of the center 8 calculates the position of the portable terminal 1 based on the emergency signal (step 55 in FIG. 9), and displays the content of the emergency signal on the display output unit 82 (FIG. 9). Step 5 of 9
6). The operator of the center 8 confirms this information on the display output unit 82 and operates the operation input unit 83 to notify the portable terminal 1 that the emergency signal 9 from the portable terminal 1 has reached the center 8 normally. The reception completion signal is transmitted from the center 8 to the base station 3 by performing an emergency signal reception confirmation completion operation (step 57 in FIG. 9) (step 5 in FIG. 9).
8). The transmission processing of a series of emergency signals 9 from the portable terminal 1 includes a call release operation of the portable terminal 1 (step 41 in FIG. 7) and an emergency communication release of the operator of the center 8 (FIG. 9).
(Step 59) or transmit repeatedly until the terminal is in a transmission-disabled state such as a failure of the terminal or running out of battery. In addition, the communication channel between the mobile terminal 1 and the base station 3 and the communication channel between the base station 3 and the center 8 that have been secured are the call release operation by the operator of the mobile terminal 1 (step 41 in FIG. 7), The center 8 is opened by canceling the emergency communication of the operator (step 59 in FIG. 9) (step 5 in FIG. 8).
1. Step 61 in FIG. 9). As a second embodiment, an embodiment of the present invention in which a portable terminal is located outside the communication area of a base station will be described with reference to the drawings. As shown in FIG. 2, the mobile terminal 1 has an emergency such as distress outside the range of the base station communication maximum distance 5 of the base station 3, but the mobile unit 10 starts searching and the mobile base mounted on the mobile unit 10. It is assumed that the mobile terminal 1 is within the range of the mobile base station communication maximum distance 74 of the station 11. The victim operates the emergency signal transmission operation unit 16 in FIG. 3 (step 2 in FIG. 7).
8), the antenna 12 and the transmission / reception processing unit 13 attempt to receive the radio wave of the base station (step 29 in FIG. 7), and the control processing unit 14 determines the reception of the radio wave of the base station (step 30 in FIG. 7). I do. In this case, radio waves from the base station cannot be received. In this case, an emergency signal is created by multiplexing the terminal identification number, emergency signal transmission start time, terminal current time, emergency contact information, optional setting information, etc. (Step 3 in FIG. 7).
7). Next, it is detected whether another terminal has already transmitted an emergency signal using the same frequency channel (step 38 in FIG. 7). If another signal is detected, the transmission timing is controlled so that transmission is not performed at the same time as this signal (step 39 in FIG. 7), and an emergency signal is transmitted (step 40 in FIG. 7). This means, for example, that all terminals
If it is known that the emergency signal is transmitted at a predetermined transmission interval every second, it is possible to transmit the emergency signal at another transmission timing by measuring the emergency signal transmission time of another terminal. On the other hand, the mobile base station 11 sets a reception channel using the operation input unit 26 to receive the emergency signal 9 of the mobile terminal 1 (step 68 in FIG. 8), so that the mobile terminal 11 differs for each mobile terminal. A communication protocol such as a frequency is set (step 64 in FIG. 10), and an emergency signal search is started (step 62 in FIG. 10). When the mobile base station 11 receives the emergency signal 9 from the mobile terminal 1 (step 66 in FIG. 10), the receiving mobile station 11 controls the directions of arrival of the radio waves received by the antennas 20 and 21 and the reception processing units 22 and 23. The calculation is performed by the processing unit (step 67 in FIG. 10).
Furthermore, if the transmission output of the mobile terminal 1 is known in advance,
By detecting the reception level of the radio wave input to the reception processing units 22 and 23 (step 68 in FIG. 10), the mobile base station 1 is detected.
The distance between the mobile terminal 1 and the mobile terminal 1 is calculated, and the position of the mobile terminal 1 is calculated (step 69 in FIG. 10). The information content of the emergency signal 9 and the calculated position of the mobile terminal 1 are displayed on the display output unit 25 (Step 70 in FIG. 10). In order to calculate a more accurate position of the mobile terminal 1, the mobile unit 1
By moving 0 (step 71 in FIG. 10) and receiving and processing the emergency signal 9 from the portable terminal 1 a plurality of times, the principle of triangulation can be used. The transmission processing of the series of emergency signals 9 from the portable terminal 1 is performed in the transmission canceling operation of the portable terminal 1 (step 41 in FIG. 7) or in a transmission disabled state such as a failure of the terminal or running out of battery. Send repeatedly until. According to the present invention, the following effects can be obtained. (1) It is possible to make an emergency call using a personal portable terminal such as a cellular phone or PHS which has become extremely popular without using a dedicated device. (2) An emergency call can be made within the communication range of the base station of the portable terminal. (3) An emergency call can be made outside the communication range of the base station of the portable terminal. (4) The operator of the portable terminal can make an emergency call by performing the same operation without being aware of the communication range of the base station of the portable terminal and the outside of the communication range. (5) Radio interference does not occur to the base station of the existing terminal. (6) The operator of the portable terminal can transmit emergency information without having a conversation. (7) Even when a plurality of emergency callers are present in the vicinity, an emergency call can be made without interference. (8) The above contributes to the efficiency of rescue of lives at the time of search and rescue of a victim.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system operation example diagram showing an embodiment of the present invention in a base station communication range. FIG. 2 is a system operation example diagram showing an embodiment of the present invention outside a base station communication range. FIG. 4 is a structural example of a portable terminal showing an embodiment of the present invention. FIG. 4 is a structural example of a base station showing an embodiment of the present invention. FIG. 5 is a structural example of a center showing an embodiment of the present invention. FIG. 7 is a configuration example of a mobile base station showing an embodiment of the present invention. FIG. 7 is a flowchart of a mobile terminal showing an embodiment of the present invention. FIG. 8 is a flowchart of a base station showing an embodiment of the present invention. FIG. 10 is a flowchart of a center showing an embodiment of the present invention. FIG. 10 is a flowchart of a mobile base station showing an embodiment of the present invention. [Description of symbols] 1 mobile terminal 2-4 base station 5-7 base station communication maximum distance 8 center 9 emergency Signal 10 Mobile 11 Mobile base station 12 Antenna 13 Reception processing unit 14 Control processing unit 15 Emergency signal control processing unit 16 Emergency signal transmission operation unit 17 Display output unit 18 Operation input unit 19 Voice input / output processing units 20, 21 Antennas 22, 23 Reception processing unit 24 Control processing unit 25 Display processing Unit 26 Operation input unit 27-42 Step number 43-51 Step number 52-61 Step number 62-73 Step number 74 Mobile base station communication maximum distance 75 Antenna 76 Transmission / reception processing unit 77 Control processing unit 78 Emergency signal control processing unit 79 Ground Line interface unit 80 Terrestrial line interface unit 81 Emergency signal control processing unit 82 Display output unit 83 Operation input unit

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Toshiro Suzuki             216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Hitachi, Ltd., Communications Division F term (reference) 5C087 AA02 AA03 AA09 AA10 AA25                       BB12 BB18 BB46 BB64 BB65                       BB74 DD03 DD49 EE05 EE08                       GG11 GG12 GG19 GG32 GG36                       GG70 GG83                 5K067 AA22 AA35 BB04 BB32 DD11                       EE02 EE10 EE16 FF03 FF17                       FF18 FF23 JJ53                 5K101 KK14 LL12 MM07 PP03 RR12

Claims (1)

Claims 1. In a mobile communication system of a portable terminal such as a PDC system, various CDMA systems, and the like, and a portable terminal such as a PHS, the portable terminal is located within a communication range of a base station as well as outside a communication range of a base station. A mobile terminal having an emergency signal transmission mechanism for transmitting an emergency signal by an operation from the mobile terminal side even in some cases; and a base station having an emergency signal relay processing mechanism capable of receiving an emergency signal from the mobile terminal and reporting to the center. Receiving an emergency signal relayed from the base station, receiving an emergency signal from the center and the mobile terminal having an emergency mobile terminal status display mechanism for displaying the content of the emergency signal and identifying the position of the mobile terminal, A mobile communication system comprising a mobile base station having an emergency signal reception and terminal status display mechanism for displaying the content of an emergency signal and specifying the position of the portable terminal. 2. The portable terminal used in the mobile communication system according to claim 1, wherein the emergency signal transmitted by the portable terminal includes an identification number of the portable terminal, a position of the portable terminal, an emergency signal transmission start time, and a terminal. A mobile terminal having a function including information on the status of the mobile terminal, including all or part of the current time, emergency contact number, and optional setting information. 3. The system according to claim 2, further comprising a function of automatically transmitting an emergency signal or a function of automatically transmitting the emergency signal intermittently by an operation from the portable terminal when the mobile station is out of the communication area of the base station. A mobile terminal characterized by the above-mentioned. 4. The portable terminal according to claim 3, further comprising an emergency signal erroneous transmission prevention mechanism for preventing the emergency signal from being spontaneously transmitted due to an erroneous operation or the like in a base station communication area. 5. The mobile communication system according to claim 1, wherein an emergency signal can be communicated using, for example, a control channel for setting a radio channel even when radio traffic is congested by another portable terminal. A portable terminal comprising: 6. The mobile communication system according to claim 1, wherein the portable terminal automatically determines both an emergency signal transmission system when the mobile terminal is within the communication area of the base station and an emergency signal transmission system when the communication terminal is out of the communication area. A mobile terminal having a switchable function. 7. A mobile communication system according to claim 1, wherein when the portable terminal transmits an emergency signal, it is detected whether or not another portable terminal is transmitting an emergency signal using the same frequency channel. A mobile terminal having a function of eliminating interference by transmitting a signal at another transmission time based on a mechanism for transmitting data. 8. The mobile communication system according to claim 1, wherein the position information of the base station is stored, and when the portable terminal is within the communication range of the base station, the radio wave arrival state from the base station and the information are stored in the terminal. A mobile terminal having a function of specifying and displaying its own position based on the position information of the base station. 9. The mobile terminal according to claim 1, wherein the center has a function of receiving and displaying information indicating that the emergency signal of the mobile terminal has been normally received. 10. A mobile terminal according to claim 1, further comprising a function of transmitting an emergency signal at a maximum power capable of outputting an emergency signal. 11. The mobile communication system according to claim 1, further comprising a function of controlling an emergency signal transmission interval according to a degree of battery consumption. 12. A base station according to claim 1, wherein said base station has a function of receiving an emergency signal from a portable terminal and transmitting it to a predetermined center. 13. The mobile communication system according to claim 1, further comprising a function of holding a connection state when an emergency signal of a portable terminal is received, unless an artificial operation is performed even after the emergency signal is interrupted. A base station characterized by the following. 14. A mobile communication system according to claim 1, wherein the center has a function of receiving an emergency signal from a portable terminal, displaying the contents of the emergency signal, and specifying and displaying the position of the portable terminal. 15. The mobile communication system according to claim 1, further comprising a function of transmitting an emergency signal from the portable terminal to the portable terminal when the emergency signal is normally received. 16. A mobile communication system according to claim 1, wherein said center has a function of automatically contacting an external system or the like based on an emergency signal of a portable terminal. 17. The mobile communication system according to claim 1, further comprising a function of receiving and displaying emergency signals from a plurality of portable terminals using wireless communication protocols having different communication frequencies, transmission control systems, and the like. Mobile base station. 18. The mobile base station according to claim 1, further comprising a function of specifying and displaying the position of the mobile terminal from the arrival direction and reception level of the emergency signal of the mobile terminal. 19. The mobile base station according to claim 1, further comprising a function of specifying and displaying the position of the mobile terminal based on the arrival direction of the emergency signal of the mobile terminal when the mobile base station moves. . 21. In the mobile communication system according to claim 1, when an emergency signal from a portable terminal is periodically transmitted, a noise signal which does not appear in a transmission interval is eliminated.
A mobile base station having a function of specifying an emergency signal from a target portable terminal.