JP3278644B2 - Emergency forced transmission terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone terminal in which, in addition to a normal receiving circuit and a transmitting circuit, a forced transmitting circuit capable of transmitting a strong electric field signal in an emergency is provided so that a base station can be connected in an emergency. If the entire line is occupied by another mobile phone terminal and the emergency transmission cannot be performed even if the predetermined mobile phone terminal makes a call using the normal transmission circuit, the emergency transmission circuit can generate a strong electric field signal. For forced transmission terminal.

[0002]

2. Description of the Related Art In the event of an emergency by a conventional portable telephone terminal, for example, a situation such as a disaster, a communication network using wireless communication is expected to be crowded immediately. But,
In such a situation, the emergency call using the wireless communication network is considered to be more important.

[0003] At present, a special system for emergency use of a mobile phone terminal has not been prepared so far, and even in an emergency state, all base station lines having receivable lines are used. You can't even get into a situation where you can talk. In this case, there is no other way than to wait for the mobile phone terminal currently using the line to end the call, but it is not possible to know when the call will end and there will be a connectable line, You have to keep making calls as many times as you want to get connected.

[0004] Assuming an emergency situation, it is impossible to keep calling a mobile phone terminal for which connection will not be established forever, and another communication means will be used.
As an emergency system, a method of always protecting the emergency call line, judging the urgency based on the number of the call destination, and allocating whether or not it is an emergency is conceivable.

[0005]

However, according to this method, it is necessary to secure an emergency call line for almost all of the communicable range, and in normal times, the number of connections is reduced by the amount of the emergency line. Can be considered. If emphasis is placed on making more lines available during a call, it will be difficult to secure an emergency line.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to secure a line in a place where an emergency line is not provided, when it is necessary to make a priority call. In addition to being able to assign all available frequencies to the general public, and for those who already have an emergency line, it is possible to increase the number of lines that can be normally used by allocating that line to the general public, and usually also in non-emergency situations It is an object of the present invention to provide an emergency forced transmission terminal that can be used for an emergency.

[0007]

In order to achieve the above object, an emergency forced transmission terminal according to the present invention comprises: a switching circuit for switching between normal transmission and reception and a forced transmission; A transmission circuit capable of transmitting to a base station at a transmission level, a reception circuit for receiving a transmission signal transmitted from the base station at a normal reception level, and a transmission output sufficiently higher than a transmission output level of the transmission circuit in an emergency A forced transmission circuit for transmitting at a level, and an antenna for the switching circuit at the time of a forced transmission operation by a user in a state where a connection line cannot be secured between the base station and the base station even when transmitted from the transmission circuit in an emergency. By controlling the connection with the forced transmission circuit and outputting a strong electric field signal from the forced transmission circuit, the mobile phone terminal within the effective suppression range is suppressed as an interference wave. And the base station determines that the line between the mobile phone terminal and the base station is disconnected. After transmitting the strong electric field signal from the base station and the forced transmission circuit for a predetermined time, A control circuit for stopping transmission of a signal, switching the switching circuit to the transmission circuit side, and performing control to output a normal transmission signal from the antenna.

[0008] Therefore, when the user of the portable telephone terminal having an emergency call judges that there is an urgency and performs a forced transmission operation, the switching of the switching circuit is controlled to connect the antenna and the forced transmission circuit. Then, a strong electric field signal is transmitted from the forced transmission circuit to the base station from the antenna. This strong electric field signal suppresses, as an interference wave, the connection line in the surrounding suppression effective range and the frequency in the vicinity thereof, thereby affecting the mobile phone terminals in the suppression effective range, and affecting each mobile phone terminal and the base station. Causes an error in the connection line, and the base station disconnects the connection line to the terminal. During the execution time, the strong transmission signal is transmitted from the forced transmission circuit to the base station, and after a predetermined time, the control circuit stops transmitting the strong electric field signal, and the control circuit switches the switching circuit to a normal transmission circuit. Since a normal transmission signal is transmitted from the transmission circuit to the base station via the switching circuit and the antenna so that an emergency call can be made from a mobile phone terminal requiring emergency communication, an emergency line is not provided. In a place, a line can be reserved when priority calls are required, and all available frequencies can be generally allocated, and those already having an emergency line can be generally allocated. The number of lines that can be normally used can be increased, and the lines can be used normally even in an emergency.

[0009]

Next, an embodiment of an emergency forced transmission terminal according to the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the first embodiment according to the present invention. The antenna 1 in FIG. 1 receives a normal level signal transmitted from a base station not shown in FIG. 1, transmits a normal level transmission signal to the base station, and transmits a strong electric field signal in an emergency. And send.

Therefore, the antenna 1 is connected to the movable terminal 2a of the switching circuit 2 in order to switch these signals. Although the switching circuit 2 is illustrated as a mechanical switch in FIG. 1, the switching circuit 2 is actually electronically controlled by the control circuit 6. The movable terminal 2a of the switching circuit 2 can be switched to fixed ends 2b to 2c. The fixed terminal 2b is connected to the input terminal of the normal receiving circuit 3. The receiving circuit 3 is connected to transmitters 7a and 7b for frequency conversion of the circuit.

Similarly, the fixed terminal 2c of the switching circuit 2 is connected to the output terminal of a normal transmitting circuit 4.
The transmitting circuit 4 is connected to transmitters 7a and 7b for frequency conversion of the circuit. Further, the fixed terminal 2 d of the switching circuit 2 is connected to the output terminal of the forced transmission circuit 5. The receiving circuit 3, the transmitting circuit 4, and the forcible transmitting circuit 5 are provided as wireless circuits in a mobile phone terminal. The receiving data of the receiving circuit 3, the transmitting data of the transmitting circuit 4, and the transmitting data of the forcible transmitting circuit 5 are provided. Are controlled by the control circuit 6.

The forcible transmitting circuit 5 is also provided with the transmitters 7a and 7b.
Is connected. That is, the receiving circuit 3, the transmitting circuit 4, and the forced transmitting circuit 5 include a control circuit 6, a transmitter 7a,
7b are commonly connected. Receiving circuit 3 and transmitting circuit 4
The main power supply 8 is used as the power supply for amplification, and the auxiliary power supply 9 is used as the power supply for amplification of the forced transmission circuit 5.
The auxiliary power supply 9 is a power supply capable of supplying a high output power.

Next, with reference to a system configuration diagram of a communication system for performing communication between the mobile phone terminal and the base station configured as described above, a mobile phone for which an emergency call is forcibly required with the base station. A system for communicating with a terminal will be described. In FIG. 2, an emergency forced transmission terminal 10 according to the present invention is connected to a base station 11 by a connection line 15.
And the other scattered mobile phone terminals 12a to 12f are connected to the connection lines 13a to 13f, respectively.
Communication with the base station 11 is possible through f. The mobile phone terminals 12a and 12b are scattered in the vicinity of the emergency compulsory transmission terminal 10 according to the present invention, and the emergency compulsory transmission terminal 10 and the mobile phone terminals 12a and 12b are It is assumed that the strong electric field signal to be transmitted is scattered within the effective suppression range 14.

Next, the operation of the first embodiment according to the present invention will be described with reference to FIGS. Assume that the emergency forced transmission terminal 10 is within the range covered by the base station 11, and that all the connection lines connectable by the base station 11 are occupied by the other mobile phone terminals 12a to 12f. Cannot make a connection with the base station 11 even if a signal is transmitted by the normal transmission circuit 4, and cannot make a call.

In this state, when the user determines that there is urgency and performs an operation of forced transmission (for example, an operation of pressing an emergency button provided adjacent to a numeric button), first,
The control circuit 6 receives a command for transmitting a forced transmission. The control circuit 6 that has received the compulsory transmission command first sets the switching circuit 2
And the forced transmission circuit 5 is connected to the antenna 1 by connecting the movable terminal 2a to the fixed terminal 2d. Next, the control circuit 6 sends the transmission data to the compulsory transmission circuit 5. The transmission data sent to the forced transmission circuit 5 is converted into a line frequency by the transmitters 7a and 7b for frequency conversion.

The transmission data having the line frequency in the forced transmission circuit 5 is amplified by receiving power supply from the auxiliary power supply 9. The transmission output level of the signal amplified by the forced transmission circuit 5 is set to a level sufficiently higher than the transmission output level of the normal transmission circuit 4.

The strong electric field signal amplified by the forcible transmission circuit 5 and transmitted from the antenna 1 via the switching circuit 2 is applied to a suppression effective range 14 around the emergency forcible transmission terminal 10.
Affects the electric field. Strong electric field signal is effective suppression area 14
In this case, the connection line and nearby frequencies are suppressed as interference waves, and the mobile phone terminals 12a and 12b of the same line frequency within the effective suppression range 14 are affected, and each mobile phone terminal and the base station 11 Connection lines 13a, 13b
Causes an error.

If the error due to the suppression continues, the base station 1
1 determines that the connection lines 13a and 13b are disconnected. The emergency forced transmission terminal 10 transmits a strong electric field signal during the time when the base station 11 determines that the connection is disconnected due to an error. After transmitting the strong electric field signal, the control circuit 6 controls the forced transmission circuit 5 to stop transmitting the strong electric field signal.

After stopping the transmission of the strong electric field signal, the control circuit 6 sets the movable terminal 2a of the switching circuit 2 to the fixed terminal 2
Switching to the c side, the output terminal of the normal transmission circuit 3 is connected to the antenna 1. As a result, the control circuit 6 sends a normal transmission signal for securing the connection line 15 to the transmission circuit 4 from the control circuit 6 in accordance with the timing at which the base station 11 determined to have lost the connection line returns to the standby state again. Therefore, transmission is performed from the antenna 1 via the transmission circuit 4 and the switching circuit 2.

Thus, the emergency forced transmission terminal 10
Arrives at the base station 11 and requests the connection line 15. In the base station 11, the connection line 1 is
3a and 13b are empty, so connection line 1
5 can be assigned. Thereby, the emergency forced transmission terminal 10 can communicate with the base station 11.

As is apparent from the above description, in the first embodiment, a general connection line is used to temporarily exclude other connection lines to secure the own line.
In a place where an emergency connection line is not provided, it is possible to secure a connection line when it is necessary to make a call with priority. In addition, since there is no need to distinguish between emergency and general connection lines according to application, it is possible to allocate all available frequencies to the general public. By allocating in general, it is possible to increase the number of connection lines that can be used usually. Furthermore, since the specialized circuit is not a part related to the call, if the specialized circuit is not used, even if it is used for private use, it does not harm the public interest and is the same as other general mobile phone terminals Therefore, it can be used normally even in non-emergency situations.

As an extension of the first embodiment, assuming that data transmitted from the control circuit 6 to the forcible transmission circuit 5 is to be modulated with higher interference, a strong electric field signal having the same electric field intensity is emitted. Thus, the effective suppression range 14 can be expanded. Further, even if the effective suppression range 14 is the same, the level of the strong electric field signal can be lowered, and the same effect can be obtained even when the amplification factor of the forced transmission circuit 5 or the supply voltage of the auxiliary power supply 9 is small. become able to.

Next, a description will be given of a second embodiment in the communication system of the emergency forced transmission terminal according to the present invention. The second embodiment is an embodiment in a case where a connection line can be more reliably secured in a place where reception is possible from many base stations. FIG. 3 is a diagram illustrating the configuration of a communication system according to a second embodiment in which the emergency forced transmission terminal according to the present invention is applied to a communication system.

Next, the operation of the second embodiment will be described with reference to FIG. In FIG. 3, connection lines 15a and 15b are established between a plurality of base stations 11a and 11b and the emergency forced transmission terminal 10 according to the present invention to enable communication. In addition, communication is possible through connection lines 13d to 13f between the base station 11a and the other mobile phone terminals 12d to 12f. Similarly, communication is possible between the base station 11b and the mobile phone terminals 12a to 12c via the connection lines 13a to 13c.

It is assumed that of the connection lines 11a and 11b, the connection line 11a can receive a signal with a higher electric field strength. Now, the base station 11a is connected to another mobile phone terminal 12d,
12e and 12f are connected to the line, and the base station 11b
It is assumed that the lines are being connected to the other mobile phone terminals 13a to 13c, and that all of the base stations 11a and 11b are in use. First, in this state, the emergency forced transmission terminal 10 according to the second embodiment is used.
From the base station 11
Both a and 11b cannot make a call because there is no empty connection line.

Here, when the user of the emergency forced transmission terminal 10 determines that there is urgency and performs a forced transmission operation, first, a command for transmitting a forced transmission is input to the control circuit 6. The control circuit 6 selects the base station 11a having the highest received electric field strength and sends information to the transmitters 7a and 7b for frequency conversion. The forced transmission circuit 5 adjusts the converted frequency to the frequency of the base station 11a and performs switching. A strong electric field signal is radiated from the antenna 1 to the base stations 11a and 11b via the circuit 2. Thereafter, a normal control signal is sent when the base station 11a enters a waiting state.

However, in FIG.
Since there are no other mobile phone terminals 12d, 12e, 12f connecting the connection line to the base station 11a, these calls are not effectively disturbed and no free connection line can be established. Therefore, even in the forced transmission of the strong electric field signal here, the connection line is not connected.

Therefore, when the control circuit 6 receives information from the base station 11a via the receiving circuit 3 indicating that the line cannot be connected even if the forced transmission to the base station 11a is performed, the control circuit 6 receives the information next to the base station 11a. The base station 11b having a high electric field strength is selected, information is sent to the transmitters 7a and 7b for frequency conversion, the converted frequency is adjusted to the frequency of the base station 11b, and a strong electric field signal is emitted. Thereafter, the control circuit 6 sends a control signal of a normal control signal at a timing when the base station 11b enters a standby state.

In FIG. 3, within the effective suppression range 14, the mobile phone terminal 12 of the other mobile phone terminals 12a, 12b, and 12c that connects the connection line to the base station 11b.
a and 12b will be included. The other mobile phone terminals 12a and 12b are suppressed, and the connection lines 13a and 13b to the base station 11b are disconnected, so that an empty connection line is generated. Here, since the emergency forced transmission terminal 10 according to the second embodiment of the present invention originates a call from the normal transmission circuit 4, a connection line 15b can be secured between the terminal and the base station 11b, and a call is made. It becomes possible. As a result, it is possible to reliably secure a connection line even in a place where reception is possible from many base stations.

Next, a third embodiment of the present invention will be described. In the third embodiment, it is possible to secure the own connection line only by affecting the minimum connection line. FIG. 4 is an explanatory diagram showing a system configuration of a communication system applied to the emergency forcible transmission terminal according to the third embodiment of the present invention. This figure 4
The configuration of the emergency forced transmission terminal itself shown in FIG. 1 is the same as the configuration of the mobile phone of the first embodiment shown in FIG.

Next, the operation of the third embodiment will be described with reference to FIG. In the third embodiment, the effective suppression range when the strong electric field signal of the emergency forced transmission terminal 10 according to the present invention is radiated at the maximum output is set to the effective suppression range 14c, and the effective suppression suppression when the output is gradually reduced. The ranges are referred to as suppression suppression effective ranges 14b and 14a. The intensity of the strong electric field signal output radiated from the antenna 1 is 14c> 1
4b> 14a. When a strong electric field signal is radiated from the antenna 1 at the maximum output from the forced transmission circuit 5, the other mobile phone terminals 12a and 12b within the effective suppression range 14c are affected, and the call is interrupted.

An object of the present invention is to secure an emergency line no matter how busy the connection line is. Therefore, it is necessary to minimize the influence on other portable telephone terminals as much as possible. . Therefore, even in the case of FIG.
Since there is one empty connection line to be secured, the two connection lines 13a and 13b are disconnected. In order to disconnect only one connection line, if the size of the effective suppression range 14c can be adjusted from the effective suppression range 14c, only the connection line 13a can be disconnected. As a procedure for adjusting to the suppression effective range 14b, the strong electric field signal is gradually increased.

When the user of the emergency forcible transmission terminal 10 determines that there is an urgency and performs a forcible transmission operation, a command for transmitting a forcible transmission is first input to the control circuit 6. In the control circuit 6,
First, the supply voltage of the auxiliary power supply 9 is adjusted so that the effective suppression range becomes the smaller effective suppression range 14a, the amplification factor in the forced transmission circuit 5 is suppressed, and the emission of the strong electric field signal is reduced by the antenna 1.
Performed by Thereafter, a normal control signal is transmitted at a timing when the base station 11 enters the standby state.

However, in FIG.
Since there is no other mobile phone terminal in a, no free connection line is available. Therefore, the line is not connected even in the transmission here. Even if a strong electric field signal having a radiation output whose effective suppression range is the effective suppression range 14a is transmitted, the base station 1 cannot establish a line connection with the base station 11.
When the control circuit 6 receives the information from the control circuit 1 via the receiving circuit 3, the control circuit 6 adjusts the supply voltage of the auxiliary power supply 9 so that the effective suppression range 14b is slightly wider than the effective suppression range 14a, and forcibly transmits the information. The amplification factor in the circuit 5 is increased to emit a strong electric field signal. Thereafter, a normal control signal is transmitted at a timing when the base station 11 enters the standby state.

In FIG. 4, only the other portable telephone terminal 12a that connects the base station 11 to the connection line is included in the suppression effective range 14b. Other mobile phone terminal 1
2a is suppressed, the connection line 13a to the base station 11 is disconnected, and an empty connection line is generated. here,
The emergency compulsory transmission terminal 10 according to the present invention can secure a connection line 15 with the base station 11 to make a call from the normal transmission circuit 4, and can make a call. As a result, it is possible to secure the own connection line only by affecting the minimum connection line.

[0036]

As described above, according to the present invention, it is possible to secure a connection line in a place where an emergency connection line is not provided and when it is necessary to make a call with priority. The first effect is obtained. The reason for this is to use a general connection line to temporarily exclude the other connection lines and secure the own connection line. In addition, it becomes possible to allocate all available frequencies to the public in general, and if there is an emergency connection line, it is possible to increase the number of connection lines that can be normally used by allocating the connection line in general. Has the effect of The reason is that there is no need to distinguish between the emergency connection line and the general connection line depending on the application. Further, there is a third effect that the device can be used normally even in an emergency. The reason is that the connection circuit specializing in the present invention is not a part related to speech, so if the connection circuit specializing in the present invention is not used, even if it is used for private use, it does not harm the public interest. This is because it is the same as other general mobile phone terminals.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of an emergency forced transmission terminal according to the present invention.

FIG. 2 is an explanatory diagram of a configuration of a communication system showing a first application example of the emergency forced transmission terminal shown in FIG. 1;

FIG. 3 is an explanatory diagram illustrating a configuration of a communication system applied to a second embodiment of the emergency forced transmission terminal illustrated in FIG. 1;

FIG. 4 is an explanatory diagram illustrating a configuration of a communication system applied to a third embodiment of the emergency forced transmission terminal illustrated in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Switching circuit, 3 ... Receiving circuit, 4 ... Transmission circuit, 5 ... Forced transmission circuit, 6 ... Control circuit, 7a, 7b ... Frequency conversion transmitter, 8 ... …
Main power supply, 9 ... Auxiliary power supply, 10 ... Emergency forced transmitter,
11, 11a, 11b ... base stations, 12a to 12f ...
Other mobile phone terminals, 13a to 13f, 15, 15a, 1
5b: connection line, 14, 14a to 14c: effective suppression range.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 25/10 G08B 25/00 520 H04M 1/725 H04Q 7/38

Claims (6)

(57) [Claims] 1. A switching circuit for switching between normal transmission and reception and for forced transmission, a transmission circuit capable of transmitting to a base station at a normal transmission level, and a transmission transmitted from the base station. A receiving circuit for receiving a signal at a normal reception level; a forced transmission circuit for transmitting at a transmission output level sufficiently higher than the transmission output level of the transmission circuit in an emergency; and the base station even when transmitting from the transmission circuit in an emergency And performing a connection control between the antenna and the forcible transmission circuit on the switching circuit and forcing the switching circuit to output a strong electric field signal when the user performs a forcible transmission operation in a state where a connection line cannot be secured between the transmission circuit and the forcible transmission circuit. Thus, the mobile phone terminal within the effective suppression range is suppressed as an interference wave so that the connection line between the mobile phone terminal and the base station is disconnected. After making the base station determine, after transmitting the strong electric field signal for a predetermined time from the base station and the forced transmission circuit, the transmission of the strong electric field signal is stopped, the switching circuit is switched to the transmission circuit side, and control is performed to perform the normal operation. And a control circuit for outputting a transmission signal from the antenna. 2. The emergency forced transmission terminal according to claim 1, wherein said reception circuit and said transmission circuit use a main power supply as an amplification power supply. 3. An auxiliary power supply capable of supplying high-power power by converting data sent from the control circuit at the time of output of the strong electric field signal into a line frequency by a transmitter for frequency conversion. 2. The emergency forced transmission terminal according to claim 1, wherein the terminal outputs a high-level strong electric field signal upon receiving the signal. 4. The control circuit, when a plurality of base stations are present, selects a base station having the highest received electric field strength in the emergency and outputs a strong electric field signal in accordance with the frequency of the selected base station. 2. The emergency forcible transmission terminal according to claim 1, wherein the terminal is output from the forcible transmission circuit. 5. The control circuit, when there are a plurality of base stations, selects a base station having the highest received electric field strength in an emergency and outputs a strong electric field signal in accordance with the frequency of the selected base station. When the receiving circuit receives the information that the line cannot be connected from the selected base station even if the signal is output from the forcible transmitting circuit, the base station having the next highest received electric field strength is selected and the selected base station is selected. 5. The emergency transmission terminal according to claim 4, wherein a strong electric field signal is output from the forcible transmission circuit in accordance with a frequency of a station. 6. The compulsory transmission circuit is controlled by the control circuit so as to gradually increase the level of the strong electric field signal until an idle connection line is formed with the base station. Item 7. The emergency forced transmission terminal according to Item 1.