JP2000201378A - Channel acquisition method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To realize a channel capturing method capable of connecting only to emergency calls even when all communication channels are in use. SOLUTION: When an emergency call request is issued from the mobile terminal side in a state where all the communication channels are blocked, the base station side sends the emergency call to the mobile terminal which has made the emergency call, out of the communication channels used by the other mobile terminals. In this case, all channels that do not transmit and receive voice are captured and emergency calls are prioritized for communication.For example, all radio channels are frequently used, such as in a mobile phone congestion area, which hinders outgoing mobile phone calls. Even in a certain area, it is possible to give priority to emergency calls to police and fire departments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system such as a portable telephone which adopts a system in which a radio area is divided and radio frequencies are used repeatedly at a certain distance from each other. Even if all are in use, the emergency call (police / fire service) call is being picked up (used) by another call on the call channel.
The present invention relates to a channel capturing method for capturing (using) a channel that is not transmitting or receiving audio.

[0002]

2. Description of the Related Art Conventionally, in a mobile communication system such as a cellular phone which adopts a system in which a wireless area is divided and a wireless frequency is repeatedly used at a certain distance from each other, one arbitrary wireless area is simultaneously used. Uses a call channel that allows calls as a finite resource.

[0003]

In such a conventional mobile communication system, if all the communication channels in the wireless area are occupied, a mobile phone which requires an emergency call (call 110 or call 119) is not available. Emergency calls cannot be made until the call channel is seized. In the case of an emergency call to the police and fire departments, it is a matter of time and it is necessary to secure a call with priority, and even if all communication channels are in use, a call channel that can be connected only to emergency calls There is a need for a capture method. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a channel capturing method that enables connection only to an emergency telephone even when all communication channels are in use.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a mobile terminal includes a base station connected to a network and managing communication with each mobile terminal. In a mobile communication system, the base station, when the mobile terminal side issues an emergency call request in a state where all the communication channels are blocked, the communication channel used by another mobile terminal for the mobile terminal that made the emergency call. A channel in which voice is not transmitted / received, and an emergency call is prioritized for communication.

[0005] According to the second aspect of the present invention, the mobile terminal detects the presence or absence of a voice during a call, and when the voice is detected, outputs an identification code indicating the start of voice transmission. In the silent state in which no sound is detected for a certain period of time while transmitting at the beginning, a voice transmission process that adds an identification code indicating the end of voice transmission to the end of the voice and transmits it, and recognizes that a call with a specific number is an emergency call And automatically adding an identification display indicating an emergency call.

According to the third aspect of the present invention, the base station monitors the start and end of voice transmission on the communication channel allocated to the mobile terminal, and performs an emergency process. And an extraction process for extracting data as a voice during a period from the end of the voice transmission to the start of the voice transmission at the time of calling.

According to the present invention, when an emergency call request is issued from a mobile terminal in a state where all communication channels are blocked, the base station communicates with the mobile terminal that made the emergency call using a call used by another mobile terminal. Since a channel that does not transmit and receive voice is captured from among the channels and communication is performed with priority given to emergency transmission, connection can be made only to emergency telephones even when all communication channels are in use.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. (1) Summary of the Invention In the present invention, the presence or absence of voice during a call is detected on the mobile terminal side such as a mobile phone, and when transmitting voice, an identification display of the start of voice transmission is added to the beginning. A function is provided for transmitting a voice and adding an identification indicating the end of the voice transmission at the end when the voice is not detected for a predetermined time.
Further, the mobile terminal has a function of recognizing an outgoing call by a specific number such as the police or fire department as an outgoing emergency call, and automatically adds an identification display indicating an outgoing emergency call when an outgoing call is made. On the other hand, on the base station side, a function of monitoring the start and end of voice transmission added to the communication channel allocated to the mobile terminal, and extracting data as a voice during a period from the end of voice transmission to the start of voice communication in an emergency call. And a function to do so.

[0009] In the base station, when all of the communication channels in the wireless area are in use and an emergency call is issued from the mobile terminal, the other mobile terminal sends an emergency call to the mobile terminal that has issued the emergency call. By performing communication through a channel that does not transmit and receive voice on the used communication channel, priority is given to emergency calls. As a result, even if all wireless (call) channels are used in an arbitrary wireless area, the call channel can be captured for priority communication such as an emergency call.

(2) Configuration Next, a configuration of a mobile communication system according to an embodiment of the present invention will be described with reference to FIG. 1-1 to 1-
n is a mobile phone located in the wireless area of the wireless base station 2. The mobile phone 1 and the wireless base station 2 have an additional function and an additional function of identifying the start and end of voice transmission and reception in the voice transmission and reception process.

Here, an outline of voice transmission / reception of an emergency call during use of all radio channels will be described with reference to FIG. Now, for example, when the time slots 1 to n allocated to the mobile phones 1-1 to 1-n are all used and in a closed state, the (n + 1) th mobile phone makes an emergency call in this state. In this case, other mobile phones 1-1 to 1-1
Among the time slots assigned to 1-n, a time slot in which voice transmission / reception is not performed is detected and used. Specifically, as will be described later with reference to FIG. 4, the voice of the emergency call is inserted into the time slot in which the identification display of the end of the voice transmission is detected. When the voice transmission start identification is detected in the inserted time slot,
In another time slot, a voice transmission end identification is searched for, and voice is inserted there. This is executed until the end of the emergency call.

Next, the configuration will be described again with reference to FIG. In FIG. 1, when all the radio channels are in use when an emergency call such as police or fire is sent from the mobile phone 1, the mobile subscriber exchange 3 is connected to another mobile phone 1.
Is provided with a determination process for executing an emergency telephone connection on a communication channel in use and a communication channel on which voice is not transmitted / received, and a function of instructing a wireless base station to connect an emergency telephone.

(3) Schematic Operation Next, a channel acquisition operation in the above system will be described with reference to FIG. The wireless area illustrated in FIG.
It is divided into n wireless channels, and for example, n mobile phones 1-1 existing in this wireless area
It is assumed that all wireless channels are used simultaneously by 1 to 1-n and there is no available channel, and in this state, n
Assume that the + 1st mobile phone has made an emergency call. FIG.
FIG. 4 is a diagram showing a sequence under such a state, that is, an emergency telephone connection sequence during use of all wireless channels.

In this figure, 〜 indicates that n mobile phones are in a talking state at the same time, and 〜 indicates the radio base station 2.
Indicates a state in which the wireless channel management function manages that all wireless channels in the wireless area are blocked. When the (n + 1) th mobile phone makes an emergency call request from this state (state), the wireless base station 2 receives the request and transitions to the state. In this state, the radio base station 2 determines that the state is an "emergency call and all radio channels in use" state, and notifies the mobile subscriber exchange 3 of a conventional emergency telephone connection process (state). On the other hand, it instructs the (n + 1) th mobile phone that has issued the emergency call request to use the silent channel (state). When a silent channel is indicated,
The state transits to the state, and the (n + 1) th mobile phone and the wireless base station 2 execute an emergency call using a silent channel among voice channels used by other mobile phones. After that, in states b and c, all states are released upon termination of the emergency call.

(4) Voice Transmission / Reception Operation Next, the voice transmission / reception operation between the mobile phone 1 and the radio base station 2 performed by the above system will be described with reference to FIG. (A) Voice transmission process In the voice transmission process, first, [Procedure 1] voice is detected from the start of a general call. [Procedure 2] The identification of the start of voice transmission is inserted at the beginning of the voice. [Procedure 3] Transmit voice.
[Procedure 4] When no sound is detected for a predetermined time, silence is detected. [Procedure 5] An identification display indicating the end of voice transmission is added at the end and transmitted. The process on the voice transmitting side repeatedly performs “from voice detection to silence detection” from the start of the call until the end of the call.

(B) Voice Reception Processing In the voice reception processing, first, from the start of a general call, [Procedure 1] an identification display of the start of voice transmission is detected. [Procedure 2] Voice reception is started. [Procedure 3] A voice is received. [Procedure 4] An identification display indicating the end of voice transmission is detected. [Procedure 5]
Stop receiving audio. The process on the voice receiving side repeats from the start of the call to "detection of voice transmission start identification display to stop of voice reception" until the end of the call.

As described above, according to the present invention, on the mobile terminal side,
Detects the presence or absence of voice during a call, adds an identification code indicating the start of voice transmission at the beginning when voice is detected, transmits voice, and indicates the end of voice transmission when no voice is detected for a certain period of time A function of adding an identification code to the end of the voice and transmitting the same, and a function of automatically recognizing an outgoing call by a specific number, such as a 110 call or 119 call, as an emergency call and automatically adding an identification display indicating an emergency call. On the other hand, the base station 2 has a function of monitoring the start and end of voice transmission on the communication channel allocated to the mobile radio terminal, and transmits data during a period from the end to the start of voice transmission of the communication channel during an emergency call. And a function of extracting as

In the base station 2, when the mobile radio terminal requests an emergency call while the communication channels are all in use, the mobile radio terminal that has transmitted the emergency call is transmitted to another mobile radio terminal. Of the communication channels that are not transmitting or receiving voice among the communication channels that are used, and prioritize emergency calls for communication. For example, when all wireless channels are busy, such as in a mobile phone congested area And even in areas where mobile phone calls are
Emergency calls to police and fire departments can be communicated with priority. Also, when a large-scale disaster occurs, general calls to the disaster area concentrate and become congested, which may make it difficult to make emergency calls to police and fire departments in the disaster area. Even in such a case, an effect of enabling a call using a wireless channel used by a general call instead of a special wireless channel can be obtained.

In the above-described embodiment, the method of connecting the emergency telephone when the radio channel is completely closed is described. However, the gist of the present invention is not limited to the mobile radio communication system, but may be applied to a wired communication system. However, the present invention can be similarly applied to a method of capturing a communication path of a trunk line.

[0020]

According to the present invention, when an emergency call request is issued from a mobile terminal in a state where all communication channels are blocked, the base station uses another mobile terminal for the mobile terminal that made the emergency call. Of the communication channels that are not transmitting and receiving channels that do not transmit and receive voice, and prioritize emergency calls to communicate, for example, frequently all radio channels are in use, such as overcrowded areas of mobile phones, Even in an area where it is difficult to make a mobile phone call, an emergency call to the police and fire department can be given priority for communication.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a configuration of a mobile radio communication system according to an embodiment of the present invention.

FIG. 2 is a sequence diagram illustrating an outline of a voice transmission / reception process.

FIG. 3 is a diagram for explaining an emergency telephone connection sequence.

FIG. 4 is a flowchart showing operations of voice transmission and voice reception.

[Explanation of symbols]

 1-1 to 1-n mobile phone 2 wireless base station 3 mobile subscriber exchange

Claims (3)

[Claims] 1. A mobile communication system comprising a mobile terminal and a base station connected to a network and managing communication with each mobile terminal, wherein the base station is connected to a mobile terminal in a state where all communication channels are closed. If an emergency call is requested from the side, the mobile terminal that made the emergency call captures the channel that is not transmitting or receiving voice among the communication channels used by other mobile terminals, and gives priority to the emergency call. A channel capturing method, characterized in that communication is performed by using a channel. 2. The mobile terminal detects presence / absence of voice during a call and, upon detection of voice, transmits an identification code indicating the start of voice transmission at the beginning of voice and transmits the voice without detecting voice for a certain period of time. In the state, an audio transmission process of adding an identification code indicating the end of the audio transmission to the end of the audio for transmission, and an additional process of recognizing an outgoing call by a specific number as an emergency call and automatically adding an identification display indicating the emergency call. 2. The channel acquisition method according to claim 1, further comprising: 3. The base station monitors a start and an end of voice transmission on a communication channel allocated to the mobile terminal, and transmits data during a period from the end of the voice transmission to the start of the voice channel during an emergency call. 2. The channel capturing method according to claim 1, further comprising an extraction process for extracting the voice.