JPH06245256A - Emergency call connection system in mobile radio system - Google Patents

Abstract

PURPOSE:To attain the connection of an emergency call even when there is no idle radio channel in a sector with respect to the emergency call connection system of a mobile radio comprising plural sectors. CONSTITUTION:When an emergency call comes while all radio channels in a sector are busy, a selection means 1 selects a specific general call among plural general calls causing the busy state. The specific general call is selected by selecting a mobile set whose reception level is lowest based on each reception level of plural mobile sets making general call talking. Then a transfer means 2 transfers the selected general call talking to a general call talking in an adjacent sector. Then an emergency call setting means 3 sets an emergency call talking to an idle radio channel in the original sector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency call connection method for a mobile radio system consisting of a plurality of sectors, and more particularly, to a mobile radio system capable of connecting an emergency call even when all the radio communication lines in the sector are in use. The present invention relates to an emergency call connection system.

In recent years, the demand for mobile communication such as automobile telephones has been increasing. In a mobile communication system such as a car phone, a large number of sectors (radio zones) centering on a base station are installed, and the mobile unit communicates with the base station of the sector in which it is currently located, thereby communicating with a fixed communication network or the like. It is possible to connect.

[0003]

2. Description of the Related Art FIG. 6 is a block diagram showing the configuration of a conventional mobile communication system such as a car telephone. That is,
Base station (BS, Base Station) 102 in sector 101
Is provided, and wireless (RF, Radio Frequency) communication is performed with the mobile device 103 of the subscriber in this sector 101. Although only one mobile unit is shown in the sector 101 in the figure, in reality, for example, a maximum of 72 mobile units can talk with the base station 102 at the same time.

The base station 102 includes a base station controller (BC
E, Base Control Equipment) 104 is connected, and this base station control device 104 has a wireless communication line management table inside, and based on this, call processing control such as connection and disconnection of wireless lines and line switching control. Is to do. Although only the base station 102 is connected to the base station controller 104 in the figure, a plurality of base stations are actually connected to the base station controller 104.

An exchange (MSC, Mobile Switching Center) 105 for mobile communication is connected to the base station control device 104, and from this exchange 105 an ordinary fixed communication network 106 is connected.
Connected to. The fixed communication network 106 is naturally connected to the police or the like 107 that receives an emergency call.

In the mobile communication system such as a car telephone configured as described above, a general call (a call other than an emergency call is called in this way) is issued from the mobile device 103 through the control line. When the call request is sent to the exchange 105 via the base station 102 and the base station controller 104, the exchange 10
Reference numeral 5 requests the base station controller 104 to allocate a wireless channel. The base station control device 104 refers to the radio communication line management table, searches for a vacant radio line, and sends a line allocation response to the exchange 105. As a result, the exchange 105 instructs the base station control device 104 to set the line, and the radio line is set between the base station control device 104 and the mobile device 103.

If the base station control device 104 refers to the radio communication line management table and there is no free radio line, the base station control device 104 cannot connect the exchange 105 and the mobile device 103. A notification to that effect was given, and thereby the call release processing was performed.

[0008]

By the way, in general, the number of mobile units that can be simultaneously used in the sector 101 is limited in mobile radio using radio waves as a medium. The probability that there will be no wireless connection will increase.

When there is no such vacant wireless line,
When there is an emergency call such as a call to the police station or fire department, there is a problem that the emergency call is not connected. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an emergency call connection method of a mobile radio system capable of connecting an emergency call even when there is no vacancy in the radio line.

[0010]

In order to achieve the above object, the present invention, as shown in FIG. 1, selects a specific general call call from a plurality of general call calls in use in a sector. Means 1; mobile means 2 for moving a selected general call call to a general call call in an adjacent sector; and emergency call setting means 3 for setting an emergency call call on a vacant line by the operation of the moving means 2. To do so.

Further, the selecting means 1 selects a specific general call call based on the reception levels of a plurality of mobile units in which the general call call is being performed. Further, it has an emergency call detecting means 4 for detecting the input of the emergency call, and when the emergency call detecting means 4 detects the input of the emergency call, the selecting means 1, the moving means 2, and the emergency call setting means 3 are operated. To do so.

[0012]

With the above configuration, in FIG. 1, when an emergency call is issued while all the wireless lines in the sector are in use,
The selection unit 1 selects a specific general call call from a plurality of general call calls in use. The selection of the specific general call call is performed by selecting the mobile station having the lowest reception level based on each reception level of the plurality of mobile stations in which the general call call is performed. Further, the detection of this emergency call is detected by the emergency call detection means 4 from the connection destination number or the like.

Next, the moving means 2 moves the selected general call call to the general call call in the adjacent sector. That is,
The mobile station with the lowest reception level is located near the edge of the sector and can be considered to be able to sufficiently communicate with the base station of the adjacent sector close to the mobile station. , A new wireless line is set up between the base station and the base station, and the current call made by the mobile device is transferred to the new line.

The emergency call setting means 3 sets an emergency call to the wireless line in the original sector which has become empty in this way. As described above, emergency call connection can be realized even when there is no available wireless line.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a mobile radio system including an emergency call connection system according to the present invention. That is, the base station (B
S) 11 has mobile stations a, b, c, d ... N and mobile station u in a sector serving as a service area. In particular, mobile station b is close to an adjacent base station (BS) 12 and 12
It is assumed that it is also possible to communicate with In addition, among these mobile stations, the mobile stations a, b, c, d, ... N are currently in use, so that all the radio lines of the base station 11 are used, and there is no free space. Suppose there is. Then, in this state, the mobile unit u displays the telephone number "110".
Suppose you have made an emergency call.

The base stations 11 and 12 have a base station controller (B
CE) 13 is connected, and this base station control device 13 has a radio communication line management table 13a inside, and performs call processing control such as connection and release of radio lines and control of line switching based on this. Is. In the figure, the base station controller 13
In the figure, only the base stations 11 and 12 are connected, but in reality, a large number of base stations are connected to the base station controller 13. Also,
The wireless communication line management table 13a shown in FIG.
The wireless communication line management table 13a actually monitors and stores the wireless line usage conditions of other base stations under the control of the base station control device 13 as well. is doing.

An exchange (MSC) 14 for mobile communication is connected to the base station controller 13, and the exchange 14 is connected to an ordinary fixed communication network (not shown). The police etc. to receive the call are connected. Although not shown in the figure, another base station control device is connected to the exchange 14, and a large number of base stations are connected to this base station control device. Then, a large number of base stations and the base stations 11, 12 and the like form a wide service area.

FIG. 3 is a block diagram showing the internal configuration of the base station controller 13 and the exchange 14. The base station control device 13 includes a wireless communication line management table 13a and a call processing control unit 13b.
a monitors and stores the usage statuses of all the wireless lines under management. The call processing control unit 13b refers to the wireless communication line management table 13a to connect or disconnect the wireless line,
Call control such as line switching control is performed.

A processing unit (CPU) 14a for controlling the operation of the exchange 14 is connected to the exchange 14, and one of its functions is an emergency call detecting means 14aa for detecting an input of an emergency call.

In the mobile radio system configured as described above, the operation when an emergency call is originated is shown in FIG.
It will be described according to the sequence shown in FIG. In the following description, the number following P is a process number attached to the broken line arrow shown in FIG. 2 and indicates a process relationship between constituent blocks.

4 and 5 are sequences showing the operation of the mobile radio system when an emergency call is made.
Shows the first half, and FIG. 5 shows the latter half. In the figure, the number following S indicates the step number of the sequence, the horizontal direction indicates the position of each device, the vertical direction indicates time, and time elapses from top to bottom.

[S1] An emergency call is sent from the mobile unit u to the base station 11 via the control line (P1). That is,
A call origination request signal with a destination number of "110" is sent to the base station 11, and then sent from the base station 11 to the base station controller 13 (P2). At this time, various parameters such as dialing signals and attributes are sent from the mobile station u to the base station control device 13 via the base station 11 as a transmission radio condition report.

[S2] From the base station controller 13 to the exchange 1
A call request signal with a destination number of "110" is sent to No. 4 (P2). [S3] In the exchange 14, the emergency call detecting means 14aa of the processing device 14a determines that the call origination request is an emergency call. In other words, the emergency call detecting means 14aa detects that it is an input of an emergency call by collating the sent party number with the emergency call number registered in advance (for example, "110", "119", etc.). I do. In this case, since the destination number "110" is sent from the mobile device u, it is detected that this call is an emergency call.

[S4] The exchange 14 is the base station controller 13
To the wireless channel (channel) request signal (P
3). At this time, an identification bit indicating an emergency call is added to this signal.

[S5] The base station control device 13 refers to the radio communication line management table 13a. In this case, FIG.
As shown in FIG. 3, since the wireless lines of the base station 11 are all in use, the emergency call cannot be connected as it is. Therefore, the mobile device a, which is connected to these lines in use,
The reception levels of b, c, d ... N are checked, and the mobile station of the lowest level is selected from them. In the case of FIG. 2, it is assumed that the mobile device b corresponds to that. The reception level is regularly reported from the mobile stations a, b, c, d ... N that are using the line to the base station controller 13 via the base station 11.

The mobile station b having the lowest reception level is located near the end in the sector, and it can be considered that the mobile station b can sufficiently communicate with the base station 12 of the adjacent sector near the mobile station b. Therefore, the mobile station b is made to stop the communication with the base station 11 and communicate with the base station 12 in the following steps S6 to S15.

[S6] The base station controller 13 causes the mobile station b selected in step S5 to measure the strength of the radio wave that can be received from the base station 12 in the adjacent sector. [S7] The measured reception level is reported from the mobile station b to the base station controller 13.

[S8] In the base station control device 13, after confirming that the reported reception level is at a level sufficient for communication, the mobile station b is switched to the other party currently communicating with the mobile station b via the base station 12. The switch 14 sends the response that the connection is possible first.
Sent as a line switching request signal (P4).

[S9] The exchange 14 is the base station controller 13
To instruct the mobile device b to newly set up a wireless line via the base station 12. [S10] The base station control device 13 designates a free wireless line to the base station 12, and instructs the base station 12 to set up a wireless communication line between the mobile station b and the base station 12 using this wireless line.

[S11] Processing such as synchronization is performed between the mobile station b and the base station 12. As a result, the wireless line 15 shown in FIG. 2 is set. [S12] The completion of the synchronization process is reported from the base station 12 to the base station controller 13.

[S13] The base station controller 13 reports to the exchange 14 that the wireless link between the mobile station b and the base station 12 has been set up. [S14] The exchange 14 instructs the base station control device 13 to disconnect the existing wireless line between the mobile station b and the base station 11.

[S15] The base station controller 13 disconnects the wireless line 16 (FIG. 2) between the mobile station b and the base station 11. As a result, the base station 11 has a free wireless line.

[S16] The base station control device 13 requests the mobile station u making an emergency call to measure the strength of the radio wave received from the base station 11. [S17] As a result, the measured reception level is reported to the base station controller 13.

[S18] In the base station control device 13, after confirming that the reported reception level is at a level sufficient for communication, the mobile station u can be wirelessly connected via the base station 11. Is sent to the exchange 14 as a line allocation response signal.

[S19] The exchange 14 is the base station controller 1
3 is instructed to set up a wireless line between the mobile unit u and the base station 11. [S20] The base station controller 13 instructs the base station 11 to specify a free wireless line, and uses this wireless line to instruct to set up a wireless communication line for an emergency call between the mobile station u and the base station 11. To do.

[S21] Processing such as synchronization is performed between the mobile unit u and the base station 11. As a result, a wireless call line for an emergency call using the idle wireless line is set (P5).

[S22] The completion of the synchronization process is reported from the base station 11 to the base station controller 13. [S23] The base station controller 13 reports to the exchange 14 that the wireless link between the mobile station u and the base station 12 has been set up.

[S24] By the above, the setting of the call line 17 shown in FIG. 2 is completed, and the emergency call between the mobile unit u and the police is started (P6). If the base station of the adjacent sector close to the mobile device b is a base station that is not under the control of the base station control device 13,
The base station controller 13 is temporarily connected to the base station controller that manages the base station, and the base station controller 13 controls the base station via the base station controller. Make the above-mentioned emergency call connection.

[0039]

As described above, according to the present invention, when an emergency call is issued while all the wireless lines in the sector are in use, a specific general call is selected from a plurality of general call calls in use. Select a call and move it to a general call call in an adjacent sector. Then, the emergency call is set to the wireless line in the original sector which has become empty.

This makes it possible to set up an emergency call in response to an emergency call even when there is no available wireless line.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a mobile radio system including an emergency call connection system according to the present invention.

FIG. 3 is a block diagram showing internal configurations of a base station control device and an exchange.

FIG. 4 is a sequence showing the operation of the mobile radio system when an emergency call is made, showing the first half thereof.

FIG. 5 is a sequence showing the operation of the mobile radio system when an emergency call is made, showing the latter half thereof.

FIG. 6 is a block diagram showing a configuration of a conventional mobile communication system such as a car telephone.

[Explanation of symbols]

 1 selecting means 2 moving means 3 emergency call setting means 4 emergency call detecting means

Claims (3)

[Claims] 1. An emergency call connection method for a mobile radio system comprising a plurality of sectors, comprising: selecting means (1) for selecting a specific general call call from a plurality of general call calls in use in the sector; A moving means (2) for moving the selected general call call to a general call call in an adjacent sector, and an emergency call setting means (3) for setting an emergency call call on an empty line by the operation of the moving means (2). An emergency call connection method for a mobile radio system, comprising: 2. The selecting means (1) is configured to select a specific general call call based on the reception levels of a plurality of mobile units in which the general call call is being performed. The emergency call connection method of the mobile radio system according to claim 1. 3. An emergency call detecting means (4) for detecting an input of an emergency call, further comprising: when the emergency call detecting means (4) detects an input of an emergency call, the selecting means (1) moves. The emergency call connection system for a mobile radio system according to claim 1, wherein the means (2) and the emergency call setting means (3) are activated.