JPH09200119A - Personal communication device - Google Patents

Abstract

(57) Abstract: A personal communication device including a PHS terminal, a wireless device, and an exchange is provided so that connection of an emergency call is guaranteed with a higher probability. SOLUTION: A database file (3) is connected to a control device (2) for controlling a call channel of an exchange (1), and the database file (3) is reserved for emergency calls at a fixed ratio to the call channel. To do so.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal communication device, and more particularly to a personal handy phone terminal (hereinafter referred to as PH
The present invention relates to a personal communication device composed of an S terminal), a base station and an exchange.

A PHS terminal is a digital portable terminal designed to be small and lightweight, and can be connected to an exchange through a large number of wireless devices (CS) installed in public telephone booths or inside buildings. As a result, it has become possible to easily make calls even in places where conventional mobile phones could not make calls, and thus great demand is expected in the future.

From such a background, it is necessary to take appropriate measures against congestion at the time of outgoing from the PHS terminal, that is, to deal with the problem of connection failure of emergency calls due to outgoing congestion due to general calls in the event of disaster. Has been.

[0003]

2. Description of the Related Art FIG. 13 schematically shows a conventionally known personal communication device. In this conventional example, three wireless devices CS1 to CS3 are provided in the same cover area CA such as in a station yard. Currently, each of the wireless devices CS1 to CS3 is currently assigned a maximum of three communication channels, and therefore the wireless device CS1.
1, PHS terminals a to c can be connected, and similarly, PHS terminals d to f and a wireless device CS3 are connected to the wireless device CS2.
, PHS terminals g to i are connectable.
That is, a maximum of three (3
It is possible to use one PHS terminal).

Due to such a mechanism, a large number of call channels are naturally required in a place where people gather, and it is necessary to install a plurality of wireless devices CS. For example, 10 wireless devices should be installed in the same area. This makes it possible to secure 30 lines.

[0005]

In such a conventional technique, an emergency call ("110" and "119" is issued from the PHS terminal z in the same cover area CA as shown in the figure.
No. ”), each wireless device CS1 to CS
Since 3 is blocked, emergency call cannot be made.

In particular, in the event of a disaster, it is inevitable that even several tens of lines will be in a congested state, and even if it is desired to perform emergency communication (police, firefighting) at that time, all the communication channels are in use. There was a big problem that I could not make a call.

Therefore, it is an object of the present invention to ensure an emergency call connection with a higher probability in a personal communication device composed of a PHS terminal, a wireless device and an exchange.

[0008]

In the present invention, the PH
The call channel used for S communication is automatically reserved for the emergency call only and secured as a channel that can be used only for emergency calls, so that the emergency call connection is guaranteed as much as possible in any case. It was possible.

The principle of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, as shown in FIG. 13, in order to prevent a situation in which even an emergency call cannot be connected because all communication channels have been used due to some call congestion and there are no free channels, Exchange 1
The file 3 is connected to the control device 2 for controlling the call channel in the above, and the file 3 stores a database for reserving an emergency call at a fixed ratio to the call channel.

As a result, as shown in FIG. 1, for example, in the wireless devices CS1 and CS2, the channels RC reserved for emergency for each one speech channel are secured, so that the PHS terminals c and e existing in the cover area CA are secured. , The control device 2 refers to the database of the file 3 to control the call channel of the exchange 1, so that the call channel from the wireless device CS1 is the PHS terminals a and b and the reserve channel. The channel is blocked and the communication channel from the wireless device CS2 is PHS.
The terminals d and f and the reserved channel are blocked, and the communication channel from the wireless device CS3 is the PHS terminal g,
Since it is blocked by h and i, the connection of the PHS terminals c and e will be refused.

However, when an emergency call is made from the PHS terminal e to the wireless device CS2 as shown in FIG. 2, the control device 2 permits the use of the reserved communication channel (hatched portion). To be able to connect.

In this case, since the database stored in the file 3 varies depending on the installation location and the traffic state, it can be changed externally by the operator of the exchange.

Further, the emergency call may be reserved at a fixed rate for each group of wireless devices, instead of all the communication channels.

Further, when an emergency call arrives from the PHS terminal, when all reserved communication channels are blocked, the control device 2 refers to the file 3 to notify when another communication channel is available. The call channel can be reserved.

[0016]

FIG. 3 shows an embodiment of a personal communication device according to the present invention. In this embodiment, CA1 to CAx exist as the same cover area, and in this embodiment, in particular, the cover area is Three wireless devices C in CA1
S1 to CS3 are provided and each wireless device CS1 to C
As described above, the three call channels ch1 to ch are included in S3.
3 is assigned.

An exchange 1 is connected to the radio devices CS1 to CS3, and a control device 2 for controlling a communication channel is further connected to the exchange 1 and further to the control device 2. The file 3 storing the database is connected.

In the illustrated example, the file 3 stores the channel states of the communication channels ch1 to ch3 of the wireless devices CS1 to CS3 for the cover area CA1.
Although a database is provided for each cover area in this example, a database for all cover areas CA1 to CAx may be provided.

The control device 2 is connected to the reserve data management device 4, and the reserve data management device 4 is further provided with data from the outside by a database 5.

4 to 9 specifically show a method of determining the reserved channel of the database file 3 shown in FIG. 3, which will be described below.

First, during normal times when the reserve function is not particularly necessary (when a disaster does not occur), the channel states are empty for all channel numbers 1 to 5, as shown in FIG.

When the reserve setting is first performed in such a state, the reserve rate is 40% as shown in FIG.
Then, since the reserve rate is given to the reserve data management device 4 from the database 5 set by the maintenance person (operation worker) shown in FIG. 3, the reserve data management device 4 In this example, the total number of channels is "5", so "5 x 0.4 = 2" is calculated,
The control device 2 is notified that the number of reserves is 2.

Based on this reserve number = 2, the control unit 2 sequentially allocates reserved channel numbers from the smallest number shown in FIG. 4 in order from the smallest number, and channels 1 and 2 are shaded. It will be reserved as shown.

Further, when it is desired to change the reserve state shown in FIG. 5, for example, to raise the ratio from 40% to 60%, the changed reserve rate of 60% is stored in the management device 4 by the database 5. Reserve number = 5
× 0.6 = 3 is calculated in the same manner as described above and given to the control device 2.

As a result, the controller 2 needs to increase the reserve number from "2" to "3" by "1", and therefore, as shown in FIG. 6, channels 3 to 5 are free unless they are in a congested state. Reserve the lowest numbered channel 3 of the channels.

On the other hand, when the reserve rate is lowered, as shown in FIG. 7, if the reserve rate is lowered from 20% to 10%, the number of reserve channels is "5 × 0.1".
= 0.5 ", and only one channel is required at maximum, so channels 1 and 2 can be used unless the reserved channel is busy.
The channel 2 with the larger number is opened to open to the general call.

Further, as shown in FIG. 6, when the reserve rate is increased from 40% to 60%, when the channels 3 to 5 are in a call (during congestion), the call is left as it is. Since it cannot be disconnected, the reserved channel cannot be secured.

In such a case, as shown in FIG. 8, the reserved channel is reserved from the subscriber who is talking on the line which is disconnected first.

Further, as shown in FIG. 7, the reserve rate is set to 2
When channels 1 and 2 are used as an emergency call as shown in FIG. 9 in the case of decreasing from 0% to 10%, the reserve channel is shifted to the idle state in order from the disconnected channel. Also, if the reserved channel is empty, it is immediately moved to the empty state.

FIG. 10 shows an operation example (1) of the embodiment of the personal communication apparatus according to the present invention when the database is set in the file 3 as described above. The call control operation of a general call and an emergency call (when not in congestion) is shown. In the following, description will be given along reference numerals 1 to 3 that indicate the processing procedure given in the drawing.

First, since the control device 2 knows in advance the maximum number of accommodated subscribers of the current communication channel, the control device 2 gives the reserve data management device 4 the maximum number of accommodated subscribers. In this case, the maximum number of accommodated subscribers may be either the number for all cover areas or the number for each cover area unit as described above.

If the reserve data management device 4 is given a reserve ratio of 10% by the database 5 as described above, the reserve ratio is multiplied by the maximum accommodated subscriber number from the control device 2 to reserve the reserve ratio. The number is calculated and returned to the control device 2.

The control unit 2 which has received the reserve number gives the reserve channel data for changing the channel state of the database in the file 3 to the file 3 and rewrites the database as shown in FIGS. .

In this example, the reserve rate given from the database 5 is 10%, and the cover area CA1
Since there can be nine call channels in total, the number of reserves is one channel, so the controller 2 sets the channel ch3 of the wireless device CS1 as a reserve channel.

When the PHS subscriber makes a general call from the PHS terminal TE after the reservation channel is secured in this way, the wireless device CS1 in the cover area CA1, for example, makes this call. To notify.

In response to this, the exchange 1 inquires of the control device 2 as to whether or not the communication channel is available for the outgoing call.

The control device 2 refers to the database of the file 3 to determine, for example, the radio device C as a general call.
Since the channel ch1 of S1 can be used, the result of the call status is returned to the exchange 1, and the exchange 1 notifies the call from the terminal TE to release the call channel. The call is in progress as shown in. Therefore, there are currently seven communication channels available for general calls.

After this, when a general call is made from another subscriber as shown by the dotted line, the channel ch2 of the radio equipment CS1 is vacant, and as shown in the figure, this channel ch2 is the general call. Is open to.

As a result, the current communication channels that can be used for general calls are six channels.

FIG. 11 shows a state (at the time of congestion) in which there are no communication channels available for general calls in the cover area CA1 from the operation state shown in FIG. 10, for example, in a solid line for the wireless device CS1. As shown in the figure, when it is assumed that channels ch1 and ch2 are being used by a general call, if a general call indicated by a dotted line is called, the control device 2 determines the number of usable channels in the general call, In this example, since the call channel cannot be used, the control device 2 having received the notification from the file 3 refuses the call channel connection.

FIG. 12 shows the flow when an emergency call is made during the congestion shown in FIG.

When such an emergency call is notified to the exchange 1, the control device 2 which receives the notification makes a determination on the number of usable channels in the emergency call by using the file 3.

In this case, as in the case of FIG. 11, the usable speech channel is "0", but since there is a reserved channel (channel ch3 of CS1), the reserved channel is secured. Also, the channel state of the traffic database is changed from "reserve" to "in use" as shown in the figure.

When a further emergency call is issued from the PHS terminal in such a state, the reserved channel is in use and is blocked, so that the reserved channel is secured when the other channel ch2 is vacant. . At this time, two channels are reserved.

Since the call channel is secured in this manner, the call enable state is transmitted to the PHS terminal to realize the call state.

[0046]

As described above, according to the personal communication device of the present invention, the database file is connected to the control device for controlling the call channel of the exchange, and the database file is provided at a constant ratio to the call channel. Since it is configured to reserve emergency calls, emergency calls (police / police /
It will be possible to secure calls and connections for the fire department.

There is also a system in which a specific wireless device is installed only for emergency call connection. However, in the present invention, it is possible to secure a channel due to traffic for each wireless device group. It is possible to deal with the increase or decrease of equipment without any influence.

[Brief description of drawings]

FIG. 1 is a block diagram (1) for explaining the principle of a personal communication device according to the present invention.

FIG. 2 is a block diagram (2) for explaining the principle of the personal communication device according to the present invention.

FIG. 3 is a block diagram showing an embodiment of a personal communication device according to the present invention.

FIG. 4 is a diagram showing an example of a database when there is no reserve function in the personal communication device according to the present invention.

FIG. 5 is a diagram showing an example of a database when a reserve function is set in the personal communication device according to the present invention.

FIG. 6 is a diagram showing an example of a database at the time of changing (increasing) the reserve ratio during execution of the reserve function (during non-congestion) in the personal communication device according to the present invention.

FIG. 7 is a diagram showing an example of a database at the time of changing (decreasing) the reserve ratio during execution of the reserve function (during non-congestion) in the personal communication device according to the present invention.

FIG. 8 is a change (increase) in reserve ratio rate during execution of a reserve function (during congestion) in the personal communication device according to the present invention.
It is a figure showing an example of a database at the time.

FIG. 9 is a reserve ratio change (reduction) during execution of a reserve function (during congestion) in the personal communication device according to the present invention.
It is a figure showing an example of a database at the time.

FIG. 10 is an operation explanatory diagram (1) of the embodiment of the personal communication device according to the present invention.

FIG. 11 is an operation explanatory diagram (2) of the embodiment of the personal communication device according to the present invention.

FIG. 12 is an operation explanatory diagram (3) of the embodiment of the personal communication device according to the present invention.

FIG. 13 is a block diagram showing a conventional example.

[Explanation of symbols]

 CS1 to CS3 wireless devices CA, CA1 to CAx same coverage area 1 exchange 2 control device 3 database file 4 reserve data management device TE PHS terminal In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A personal communication device comprising a personal handyphone terminal, a wireless device and an exchange, for controlling a call channel of the exchange and for reserving an emergency call to all the call channels at a constant rate. And a file storing a database for the personal communication device, wherein the control device controls the call channel by referring to the database. 2. The personal communication device according to claim 1, wherein the predetermined ratio can be changed from the outside. 3. The personal communication device according to claim 1, wherein the database reserves emergency calls at a fixed rate for each group of the wireless devices instead of the all communication channels. . 4. The control device according to claim 1, wherein when an emergency call is received from the terminal and all the reserved communication channels are blocked, the control device refers to the file. A personal communication device which reserves a call channel when another call channel is available.