JPH1132377A - Emergency communication system for cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make emergency communication available by disconnecting the line of non-emergency communication under the control of a switchboard when there is no empty line between a mobile station and a base station at the time of emergency transmission. SOLUTION: A central processing unit 201 of a switchboard which receives an emergency communication request obtains all communication slots which are being used for non-emergency communication according to the using situation of communication slots which are being used by a base station from a base station state table 23, telephone number state table 203, and telephone number state table 202, and selects a mobile station executing non-emergency communication to be forcedly disconnected from the telephone number state table 202. Then, the central processing unit 201 of the switchboard which disconnects a mobile station transmits emergency communication connection to the base station, and permits emergency communication. The central processing unit of the base station assigns the communication slot used by the empty mobile station to a mobile station 1 as a link channel, and transmits it to the mobile station. The central processing unit of the mobile station which receives the link channel assignment continues a connection processing with an emergency accepting telephone, and operates emergency communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an emergency communication method for a cordless telephone system, and more particularly, to a method for performing emergency communication in a cordless telephone system such as a PHS.

[0002]

2. Description of the Related Art A method of using a communication line of a PHS (second generation digital cordless telephone system) adopting a TDMA (time division multiple access) system is that one frequency is multiplexed four times, and one frame is upstream and downstream. It consists of a total of 8 slots, 4 slots each. Since one call can be made in each slot of uplink and downlink, one base station (in the case of one radio control unit, all base stations shown below are examples of one radio control unit) is up to 4 A call can be made, but one slot for each uplink and downlink is normally used as a control channel commonly used by all mobile stations. Therefore, the number of simultaneous calls that can be made by one base station at the same time is three.

[0005] FIG. 25 is a diagram when two calls are being made by one base station. In this case, the mobile unit 1 and the mobile unit 2 are talking using the uplink and downlink slots 1 (hereinafter, referred to as slot 1) and slot 2, and slot 0 is used for control. If a new call is made here, it is possible to make a call using the vacant slot 3. FIG. 26 is a diagram when three calls are made by one base station. In this case, all slots are used for communication and control, and communication cannot be established if the call is transmitted in this state.

That is, one base station can normally use four slots, but these slots are divided into one for control and three for communication. In the control slot, control information for maintaining the PHS service is transmitted and received between the mobile station and the base station. In the communication slot, communication (communication between terminals (mobile station in PHS, telephone, FAX, etc. in general public network)) is performed. , Data communication). The mobile station receives the control slot when waiting, and shifts to the communication slot only when performing communication. Therefore, the number of simultaneous communication that can be performed by a base station having one TDMA wireless control device is 3
Because it is communication, no matter how urgent communication,
If there is no space in the communication slot, communication could not be performed.

[0005]

In the conventional system, when all the communication slots are already used for another communication, the mobile station makes an emergency call (for example, a call to the police or fire department). Even in this case, since there is no vacant communication slot as shown in FIG. 27, the connection could not be made without allocating the necessary link channel when connecting from the base station. In such a case, it is necessary to wait for the line to become available and then perform a calling operation again from the mobile station, or move to the area of the base station with a vacant communication slot. Was.

As a countermeasure, there has been proposed a method in which a base station manages radio resources (communication channels, slots, etc.), disconnects a call during non-emergency communication, and releases a communication slot for an emergency call. In handling the released call, there is a charging problem when waiting for radio resources to become free, and when the held partner station is a terminal of another network, the base station is used even if the held message is played. It is necessary to exchange a call from a voice output device to a voice output device, resulting in a complicated network configuration.

[0007] The present invention has been made in view of the above points,
Emergency communication of a cordless telephone system that can connect emergency call communication even when there is no free line between the mobile station and the base station and prevents the network configuration from becoming complicated in terms of billing and messages. The aim is to provide a method.

[0008]

According to a first aspect of the present invention, there is provided a mobile station having a predetermined number of communication lines in a service area of a base station, one of which is used for control, and the base station is provided with an exchange. In an emergency communication method of a cordless telephone system connected to a public line network via the mobile station, the line information between the mobile station and the base station is managed by the exchange, and connected to the mobile station or the public line network If there is no free line between the mobile station and the base station at the time of the emergency call from the emergency reception telephone, the non-emergency communication line is disconnected under the control of the exchange, and the emergency call communication is connected.

Therefore, even when there is no free line between the mobile station and the base station, the non-emergency communication can be disconnected and the emergency communication can be connected. According to a second aspect of the present invention, in the emergency communication method of the cordless telephone system according to the first aspect, information on the line of the non-emergency communication to be disconnected is stored in the exchange, and the communication between the mobile station and the base station is performed. When there is a vacancy in the line, the disconnected non-emergency communication is restarted.

[0010] Therefore, the non-emergency communication that has been forcibly disconnected can be automatically restarted when a line becomes available. According to a third aspect of the present invention, in the emergency communication method of the cordless telephone system according to the first aspect, when the emergency call based on the emergency call is completed, a line between the corresponding mobile station and the base station is controlled by a switch. And leave for a certain time.

[0011] Therefore, when there is a call from the mobile station related to the terminated emergency call and a call back from the emergency communication destination, it is possible to communicate using the vacant line. According to a fourth aspect of the present invention, in the emergency communication method of the cordless telephone system according to the first aspect, the disconnection information is transmitted to the mobile station of the line to be disconnected under the control of the exchange using the control line.

[0012] For this reason, information such as a disconnection message can be sent to a mobile station that is performing non-emergency communication forcibly disconnecting. According to a fifth aspect of the present invention, the communication line of the mobile station in the service area of the base station is a predetermined number, one of which is used for control, and the base station is connected to the public line network via an exchange. In the emergency communication method of a cordless telephone system, line information between the mobile station and the base station is managed by the exchange, and when an emergency call is issued from the mobile station or an emergency reception telephone connected to the public line network. If there is no free line between the mobile station and the base station, the emergency communication is connected using the control line.

[0013] Therefore, when there is no available line between the mobile station and the base station, emergency communication can be connected using the control line. According to a sixth aspect of the present invention, in the emergency communication method of the cordless telephone system according to the fifth aspect, the mobile station moves within the service area of the corresponding base station before connection of emergency call communication using the control line. A stop of transmission of control information is notified to the station using the control line.

[0014] Therefore, it is possible to notify each mobile station that transmission of control information is stopped before using the control line for emergency communication.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a PHS system configuration diagram. In the figure, each of mobile stations 101 to 105 is a base station 10
6,107 are communicated. The base stations 106 and 107 are connected to a public line network by an exchange 108, and each of the mobile stations 101 to 105 is connected to an emergency reception telephone 10 of the public line network.
Communication is possible between the telephones 9, 110, 111 and the general telephones 112, 113.

FIG. 1 shows a block diagram of one embodiment of switch 108. In the figure, a central processing unit 201 performs exchange processing and controls the entire exchange. As shown in FIG. 20, the telephone number status table 202 stores the other party's telephone number communicating with each telephone number, the start time, and the base station number. The use state, mobile station telephone number, and area number are stored for each slot number of the base station.

FIG. 22 shows the disconnected mobile station registration table 204.
As shown in FIG. 3, the telephone number of the other party, the hold / disconnect wait flag, and the held call management number are registered for each mobile station telephone number whose communication has been forcibly disconnected.
As shown in FIG. 3, mobile station telephone numbers, base station numbers, reserved slot numbers, and timer numbers are stored as emergency line reservation data.
As shown in (1), a mobile station telephone number, an emergency reception telephone number, an area number, and a base station number are stored as data waiting for an emergency communication connection.

The emergency communication control device 207 controls emergency communication. The voice guidance output device 208 outputs voice guidance registered in advance. The emergency call receiving telephone number device 209 stores the telephone number of the received emergency call. The base station communication device 210 includes an exchange and each of the base stations 106 and 107.
To communicate with The public line communication device 211 performs communication between the exchange and the public line 115.

FIG. 3 is a block diagram showing an embodiment of each of the base stations 106 and 107. In the figure, the base station is a wireless device 30
0, the central processing unit 304, and the switch communication device 305.
They are roughly divided into The wireless device 300 includes a transmitting unit 302 and a receiving unit 303, and performs communication with a mobile station using the antenna 301. The central processing unit 304 performs reception processing from the mobile station or the exchange. An exchange communication device 305 communicates with the exchange 108.

FIG. 4 is a block diagram showing an embodiment of each of the mobile stations 101 to 105. In the figure, a wireless device 400 has a transmitting unit 402 and a receiving unit 403, and performs communication with a base station using an antenna 401. The central processing unit 404 performs transmission processing, reception processing, out-of-service processing, and the like. In the emergency call number table 405, telephone numbers of emergency calls such as police and fire are registered. The input device 406 inputs a telephone number and other information.

The voice processing device 407 processes the voice signal received by the wireless device 400 to generate a voice signal, and supplies the voice signal to the receiver 409 for sound generation. Also, the voice processing device 40
Reference numeral 7 processes the audio signal supplied from the transmitting device and supplies it to the wireless device 400 as a transmission signal. The display device 410 displays a telephone number, a message, and the like input from the input device 406.

In the present invention, the emergency communication is performed by the emergency call number table 405 provided in the mobile station when the mobile station originates a call.
The telephone number registered in (FIG. 4) and the called party number are collated, and if they match, it is regarded as emergency communication, and a flag indicating an emergency call is provided in the link channel establishment request transmitted from the mobile station to the base station (PHS ARIB, the standard for systems
STANDARD 2nd edition ((RCR STD-28)
The message is realized by using the optional function of the link channel establishment phase of (1) and is turned on to be transmitted to the base station. When the base station receives the link channel establishment request with the emergency call flag turned on, the base station determines that the communication is an emergency communication, and the exchange determines the called number transmitted from the mobile station. No.) is compared with the telephone number in the emergency call reception telephone number storage device, and when they match and when an emergency communication request is received from the base station, it is determined that the communication is emergency communication.

FIG. 5 shows a flowchart of the transmission processing performed by the central processing unit 404 of the mobile station. In FIG.
In step 10, the input called telephone number is compared with the telephone number in the emergency call number table 405 to determine whether or not the call is an emergency call. In step S12, it is determined whether or not the collation result indicates an emergency call. If not, the emergency call flag is turned off in step S14, a link channel establishment request is transmitted, and the process proceeds to step S18. If it is an emergency call, step S
In step 16, the emergency call flag is turned on, a link channel establishment request is transmitted, and the flow advances to step S18.

In step S18, it is determined whether or not a timeout has occurred. If not, it is determined in step S20 whether or not a link channel vacancy wait has been received. If this is received, emergency connection information is transmitted in step S22. If not received, normal communication connection processing is performed in step S24 and the process proceeds to a standby processing. On the other hand, step S
If a timeout has occurred in step 18, it is determined in step S26 whether or not a retry is to be performed. If not, the process proceeds to step S16. If the retry is out, the transmission process is stopped in step S28, and the process proceeds to a standby process.

FIG. 6 is a flow chart of the broadcast information stop notification receiving process performed by the central processing unit 404 of the mobile station.
In the figure, in step S30, a base station other than the base station that transmitted the broadcast information is searched. Next, in step S32, it is determined whether or not another base station can be searched. If the search is successful, the process proceeds to a standby process for the base station searched in step S34.

If the search is not successful, the display unit 410 indicates in step S36 that the user is out of the service area due to the use of an emergency call.
To notify the user. Next, reception is stopped for a predetermined time in step S38, and a search for a base station is performed in step S40. Here, it is determined whether or not the base station has been searched in step S42, and if not, the process proceeds to step S38. If the search is successful, the process proceeds to step S44, in which the display of out of service area is canceled, and the process proceeds to a standby process for the searched base station.

FIG. 7 shows a flowchart of a normal out-of-service process performed by the central processing unit 404 of the mobile station. In the figure, in step S50, reception is stopped for a certain time, and then in step S50.
At 52, a search for a base station is performed. Here, it is determined whether or not the base station has been searched in step S54, and if not, the process proceeds to step S50. If the search is successful, the process proceeds to step S56, in which the display of out of service area is canceled, and the process proceeds to a standby process for the searched base station.

FIG. 8 shows a flowchart of the reception processing from the mobile station performed by the central processing unit 304 of the base station. In the figure, if the information from the mobile station is a request for establishing an (ON) link channel with an emergency call flag, this is received in step S60. Then, in a step S62, it is determined whether or not there is an empty communication slot, and if so, the process proceeds to a step S64 to perform a normal process. If there is no vacancy, the process proceeds to step S66, an emergency communication request is transmitted to the exchange, and in step S68, monitoring of a link response waiting timer is started to wait for a request.

If the information from the mobile station is emergency connection information, the emergency connection information timer is canceled in step S72, and it is determined in step S74 whether all information has been received. If not, the process for assembling the emergency connection information is performed in step S76, and the monitoring of the emergency connection information timer is started in step S78 to wait for a request. Further, if the information from the mobile station is other information, step S82
, And normal processing is performed in step S64 to wait for a request.

FIG. 9 is a flow chart showing a reception process from the exchange performed by the central processing unit 304 of the base station. In the figure, if the information from the exchange is the emergency communication connection information, it is received in step S90, the link channel assignment is transmitted to the mobile station in step S92, and the request waits. If the information from the exchange is an emergency connection information inquiry, it is received in step S94, and the response waiting timer is canceled in step S96. Next, at step S98, a link channel vacancy wait is transmitted to the mobile station, and the mobile station waits for a request.

If the information from the exchange is an emergency call, it is received in step S100, and the information is received in step S102.
Sends an incoming call to the mobile station. Next, a link channel establishment request from the mobile station is received in step S104, and a link channel assignment is transmitted to the mobile station in step S106.
Next, a stop notification of the control slot is transmitted to the mobile station in step S108, the transmission of the broadcast information is stopped in step S110, and the use of the control slot for communication is started in step S112 to wait for a request.

Further, if the information from the exchange is that the reservation of the emergency communication slot has been released, this is received in step S114, the reserved slot is released in step S116, and the request waits. If the information from the exchange is a reservation for an emergency communication slot, this is received in step S118, and an empty slot is reserved in step S120 for emergency transmission from the mobile station or reception from the exchange, and the request waits. .

If the information from the exchange is other information, it is received in step S122, and
The routine proceeds to 128, where normal processing is performed and the request waits. FIG.
9 shows a flowchart of a monitoring timer timeout process performed by the central processing unit 304 of the base station. In the figure, if the link response waiting timer times out in step S130, a link channel rejection is transmitted to the mobile station in step S132, and the request waits. Step S13
If the emergency connection information timer times out in step S4, the mobile station transmits a release of waiting for a link channel vacancy in step S136, and transmits emergency connection information to the exchange in step S138 to notify the mobile station of an abnormality and wait for a request.

FIG. 11 shows a flowchart of the connection processing performed by the central processing unit 201 of the exchange. In the figure, if the connection request is an emergency communication request, this is received in step S140, and in step S144, the telephone number status table 202
And the communication slot usage status from the base station status table 203. Next, in step S146, it is determined whether or not there is non-emergency communication. If there is no non-emergency communication, an emergency connection information inquiry is made in step S148, and the request waits. If there is, it is determined in step S150 whether or not there are a plurality of non-emergency communications,
If there is more than one, non-emergency communication with a long communication time is selected from the telephone number status table in step S152. If not, the corresponding non-emergency communication is selected from the telephone number status table in step S154.

Next, voice guidance is sent from the voice guidance device 208 to the non-emergency communication mobile station selected in step S156, and the mobile station is disconnected.
And suspends the opposite station and stops charging. After this,
The base station status table and the telephone number status table are updated in step S158, and a call connection process is performed in step S160.

If the connection request is a call connection request, it is received in step S162, and is received in step S15.
Proceeding to 8, the table is updated, and then a call connection is made. If there is a call connection request from the emergency reception telephone, this is sent to step S
In step S166, it is determined whether or not communication is possible. If there is, the process proceeds to step S158 to update the table and then make a call connection.
At 68, it is determined whether or not all communications are emergency communications,
If so, in step S170, an emergency call is notified to the base station, and the request waits.

FIG. 12 shows a flowchart of the release processing performed by the central processing unit 201 of the exchange. In the figure, in step S180, the disconnected mobile station registration table is checked, and in step S182, it is determined whether the mobile station is other than the opposite station waiting for reconnection. If the opposite station is waiting for reconnection, the opposite station is released in step S184, and the disconnected mobile station registration table is updated in step S186 to wait for a request.

On the other hand, if it is other than the waiting station for reconnection, release processing is performed in step S188, and it is determined in step S190 whether or not the communication slot is free. If not, the request waits. If it is vacant, it is determined in step S192 whether or not to release the non-emergency communication, and if not, it requests the base station to reserve an emergency communication slot in step S194. Then, in step S196, monitoring of the emergency communication slot reservation timer is started. In step S198, the emergency communication slot reservation timer is registered in the emergency line reservation table 205, and the process proceeds to step S200.

If the non-emergency communication is released in step S192, the flow advances to step S200 to update the base station status table 203 and the telephone number status table 202. Next, in step S202, the emergency communication connection waiting table 206
Is checked, and it is determined in step S204 whether or not there is an emergency communication connection waiting. If there is, the mobile station and the emergency reception telephone number are acquired from the emergency communication connection waiting table 206 in step S206, the emergency communication connection waiting table 206 is updated in step S208, and the mobile station and the emergency reception telephone number are called in step S210. Connect and step S2
Proceed to 16.

If there is no emergency communication connection waiting at step S204, the disconnected mobile station registration table is checked at step S212, and it is determined at step S214 whether or not there is a non-emergency communication reconnection waiting. If so, in step S216, the mobile station is connected to the opposite station that is on hold, and waits for a request. FIG. 13 shows a flowchart of the timeout processing of the emergency communication slot reservation timer performed by the central processing unit 201 of the exchange. In the figure, the corresponding base station number is acquired from the emergency line reservation table 205 in step S220, and the emergency line reservation table 205 is updated in step S222. Next, the base station status table is checked in step S224, and it is determined whether or not there is a reserved communication slot in step S226. If there is, the corresponding base station is notified of the emergency communication slot reservation release in step S228. If there is no request, the request waits.

FIG. 14 is a flowchart showing another process performed by the central processing unit 201 of the exchange. In the figure, if there is emergency connection information from the base station, this is sent to step S230.
At step S232 to determine whether or not the information received is normal. If it is normal, in step S234, it is registered in the emergency communication connection waiting table 206 and waits for a request. If it is not normal in step S232, it waits for a request. If it is other information, step S
This is received at 236, normal processing corresponding to the received information is performed at step S238, and the request waits.

Next, a case will be described with reference to the sequence diagram of FIG. 15 where there is already a base station in which all communication slots are blocked by non-emergency communication and emergency communication is performed from a mobile station under this situation. In the figure, when emergency communication is performed from the mobile station 1, the central processing unit 304 of the base station determines that the emergency communication is in use of all communication slots as shown in the reception processing from the mobile station in FIG. An emergency communication request is transmitted to 106.

At the central processing unit 201 of the exchange that has received the emergency communication request, the central processing unit 201 of the exchange uses the base station status table 203 and the telephone number status table 202 to determine the communication slot used by the base station, as shown in the connection process of FIG. From the usage status (emergency communication or non-emergency communication), all communication slots used in non-emergency communication are acquired, and the telephone number status table 20 is obtained.
The mobile station N shown in FIG. 15 which performs the non-emergency communication forcibly disconnecting the mobile station N is selected. The reason for the selection is, for example, a long communication time. Then, the charging of the general telephone 1 which is the opposite station communicating with the mobile station N is stopped, and the line is connected to the hold line. Please wait for a while for communication that requires ".", Disconnect the mobile station N, and register it in the disconnected mobile station registration table 204.

Based on the reason for the disconnection, the mobile station N is disconnected by the central processing unit 404 from the voice processor 407 to the receiver 408, for example, "forcibly disconnected due to emergency communication." Let the user hear the voice or display 4
10, the message "Forcible disconnection due to emergency communication" is displayed. The central processing unit 201 of the exchange that has disconnected the mobile station N transmits an emergency communication connection to the base station and permits the emergency communication.

The central processing unit 304 of the base station that has received the emergency communication connection transfers the communication slot used by the vacant mobile station N to the mobile station 1 as shown in the reception processing from the exchange in FIG. Assigned as link channel, mobile station 1
Send to The central processing unit 404 of the mobile station 1 that has received the link channel assignment continues the connection processing with the emergency reception telephone to realize the emergency communication.

Further, when the mobile station 2 shown in FIG. 15 using the base station disconnects the communication, the central processing unit 201 of the exchange exchanges the disconnected mobile station registration table 204 as shown in the release processing of FIG. As a result, the mobile station N
Was forcibly disconnected and was waiting for reconnection,
The mobile station N is called from the exchange, and the responding mobile station N and the general telephone 1 previously connected to the hold line are reconnected to resume charging and non-emergency communication. If the ordinary telephone 1 disconnects the line before the non-emergency communication is resumed, the central processing unit 201 of the exchange sets the disconnected mobile station registration table as shown in steps S184 and S186 of the release processing 1 in FIG. The information of the mobile station N and the general telephone 1 is deleted from 204, and the restart processing is canceled.

Next, a case where there is a base station in which all communication slots are already blocked by emergency communication and emergency communication is performed from a mobile station under this situation will be described with reference to the sequence diagram of FIG. In the figure, when emergency communication is performed from the mobile station 1,
The central processing unit 304 of the base station determines that the emergency communication is using all communication slots and transmits an emergency communication request to the exchange, as shown in the reception processing from the mobile station in FIG.
In the central processing unit 201 of the exchange that has received the emergency communication request, as shown in the connection processing in FIG. 11, the usage status of all communication slots used by the base station is determined from the base station status table 203 and the telephone number status table 202. (Emergency communication or non-emergency communication) is determined, and after recognizing that they are all used for emergency communication, an emergency connection information inquiry is transmitted to the base station.

The central processing unit 304 of the base station having received the emergency connection information inquiry transmits a link channel vacancy wait to the mobile station 1 as shown in the reception processing from the exchange in FIG. The central processing unit 404 of the mobile station 1 that has received the wait for the link channel vacancy assigns the transmission processing 80 in FIG.
As shown in FIG. 1, the emergency connection information (ARIB STANDARD 2nd edition (RC
R STD-28) in the link channel establishment phase
The own station number and the emergency reception telephone number are transmitted to the base station as the CCH (channel for individual cell) option.

In the central processing unit 304 of the base station receiving the emergency connection information, the reception processing 90 from the mobile station shown in FIG.
As indicated by 1, the emergency connection information is transmitted to the switching network. Central processing unit 201 of the exchange receiving the emergency connection information
Is registered in the emergency communication connection waiting table 206 as shown in the other processes of FIG. 14, and waits until the emergency communication currently in communication is disconnected and a communication slot becomes empty. Here, when the line between the mobile station N and the emergency reception telephone N that was performing the emergency communication is disconnected, the central processing unit 201 of the exchange, when the emergency communication is disconnected as shown in the release processing of FIG. The mobile station 1 checks the emergency communication connection waiting table 206,
Recognizes that an emergency call has been made to the emergency reception telephone 1 and calls and connects each of them to realize emergency communication.

Next, FIG. 17 shows an example in which a control slot between a mobile station and a base station is used when emergency communication is performed from an emergency reception telephone to a base station in which all communication slots are already blocked by emergency communication. It is shown below. Emergency reception phone 1
, The central processing unit 210 of the exchange that has accepted the call compares the calling number with the emergency telephone number in the emergency call reception telephone number storage device 209. As shown in the connection process, an emergency call is transmitted to the base station. The central processing unit 304 of the base station that has received the emergency incoming call transmits an incoming call to each mobile station in the area as shown in the reception processing from the exchange in FIG. When receiving the incoming call, the mobile station 1 transmits a link channel establishment request to the base station. Upon receiving this, the base station transmits a link channel assignment to the mobile station 1.

At this time, the slot currently used for control is allocated for communication. After that, the base station informs that the broadcast information will be stopped due to emergency for a certain period of time,
Emergency communication between the mobile station 1 and the emergency reception telephone 1 is realized by stopping the transmission of the broadcast information and performing connection processing with the mobile station 1 using the slot previously used for control for communication. I do. As a result, as shown in FIG. 18, all of slots 0 to 3 are used for communication. Here, the central processing unit 404 of each mobile station that has received the notification stop of the broadcast information from the base station, as shown in the broadcast information stop notification reception processing of FIG. If the base station exists, the base station stands by, and if not, the corresponding information is displayed on the display device 410 to notify the user of the out-of-service area due to the use of the emergency call, and thereafter, the base station is kept in a constant state until a base station capable of waiting is found. Search every hour.

Mobile stations that have been powered on after the broadcast information is stopped or mobile stations that have moved from other areas are in an out-of-service state as shown in the normal out-of-service processing of FIG. 7, and search for base stations at regular time intervals. It will be. When the mobile station N performing emergency communication disconnects communication in this state, the central processing unit 304 of the base station restarts transmission of broadcast information using the disconnected communication slot as a control slot. Mobile stations that are out of range because they cannot wait for other base stations are searching for base stations at regular intervals as described above.
By receiving this notification information, the mobile station returns from the out-of-service state and enters a normal standby state. By using this method,
Even when emergency communication is required when there is no available communication channel, emergency communication can be performed without disconnecting the call in progress.

Next, an operation of preferentially assigning a communication slot to a mobile station that has been disconnected for a certain period of time after the emergency communication has been disconnected will be described with reference to the sequence diagram of FIG. The mobile station 1 and the emergency reception telephone 1 are in emergency communication using the communication slot. In this state, when the emergency communication is disconnected from the mobile station 1, the central processing unit 201 of the exchange detecting the emergency communication is disconnected.
, Recognizes that the emergency communication has been disconnected, transmits an emergency communication slot reservation to the base station, and stores the mobile station 1 in the emergency line reservation table 205 as shown in the release processing of FIG.
Registers the information reserved for the line and activates the emergency communication slot reservation timer.

The central processing unit 304 of the base station that has received the emergency communication slot reservation secures the currently vacant slot for emergency communication as shown in the reception processing from the exchange in FIG. Restrict use of non-emergency communications from stations. Therefore, when a link channel establishment request for non-emergency communication is received from the mobile station N in this state,
Immediately transmits link channel rejection (reason: no vacant slot) to mobile station N to inform that transmission is not possible. The slot reserved for the emergency cannot be used until the emergency communication slot reservation timer started by the exchange times out or the emergency communication occurs. At this point, the emergency communication slot reservation timer is canceled, and at the same time, the corresponding information registered in the emergency line reservation table 205 is also deleted. By doing so, it is possible to immediately connect emergency communications that are likely to occur continuously.

As described above, it is possible to smoothly connect the emergency communication by applying the present invention. The embodiment of the present invention is based on ARIB STANDARD 2nd edition (RCR ST
D-28) is realized by extending the function.
DMA (code division multiple access: code division)
The present invention can be widely applied to an emergency communication method in a system of another system such as an n multiple access system.

As described above, according to the present invention, the emergency call transmitted from the mobile station can be performed even when the base station to be connected to the mobile station is in shortage of resources such as a lack of slots and communication channels. In a PHS-WLL (Wireless Local Loop) system, which can connect a line without responding that communication is impossible and can provide a service equivalent to a telephone connected to a wired network, In addition to the call quality and toll system, in addition to the callability in an emergency, the emergency communication method according to the present invention is a PHS-
It greatly contributes to the development of the WLL system.

[0057]

As described above, the first aspect of the present invention provides
In a cordless telephone system emergency communication method in which a predetermined number of communication lines of mobile stations within a service area of a base station are used, one of which is used for control, and the base station is connected to a public line network via an exchange. The line information between the mobile station and the base station is managed by the exchange, and the mobile station and the base station are connected during an emergency call from an emergency reception telephone connected to the mobile station or the public line network. If there is no free line, disconnect the non-emergency communication line under the control of the exchange,
The emergency call communication is connected.

Therefore, even when there is no free line between the mobile station and the base station, the non-emergency communication can be disconnected and the emergency communication can be connected. The invention according to claim 2 is
The emergency communication method for a cordless telephone system according to claim 1, wherein information on the line of the non-emergency communication to be disconnected is stored in the exchange, and when a line is generated between the mobile station and the base station, The disconnected non-emergency communication is restarted.

Therefore, the non-emergency communication that has been forcibly disconnected can be automatically restarted when a line becomes available. According to a third aspect of the present invention, in the emergency communication method of the cordless telephone system according to the first aspect, when the emergency call by the emergency call is completed, the line between the corresponding mobile station and the base station is switched. Keep a certain period of time under the control of.

Therefore, when there is a call from the mobile station related to the terminated emergency call and a call back from the emergency communication destination, it is possible to communicate using the vacant line. According to a fourth aspect of the present invention, in the emergency communication method of the cordless telephone system according to the first aspect, the disconnection information is transmitted to the mobile station of the line to be disconnected under the control of the exchange by using the control line. .

[0061] Therefore, information such as a disconnection message can be sent to a mobile station that is performing non-emergency communication forcibly disconnecting. According to a fifth aspect of the present invention, there is provided a mobile station having a predetermined number of communication lines within a service area of a base station, one of which is used for control, and the base station is connected to a public line network via an exchange. In the emergency communication method of a cordless telephone system to be connected, line information between the mobile station and the base station is managed by the exchange, and an emergency call from the mobile station or an emergency reception telephone connected to the public network is performed. If there is no free line between the mobile station and the base station at the time of calling, the communication for the emergency calling is connected using the control line.

Therefore, when there is no free line between the mobile station and the base station, emergency communication can be connected using the control line. The invention described in claim 6 is
6. The emergency communication method for a cordless telephone system according to claim 5, wherein the control line is connected to a mobile station in a service area of a corresponding base station before connection of emergency call communication using the control line. To notify the stop of transmission of control information.

Therefore, it is possible to notify each mobile station that transmission of control information is stopped before using the control line for emergency communication.

[Brief description of the drawings]

FIG. 1 is a block diagram of an exchange.

FIG. 2 is a system configuration diagram of a PHS.

FIG. 3 is a block diagram of a base station.

FIG. 4 is a block diagram of a mobile station.

FIG. 5 is a flowchart of a transmission process.

FIG. 6 is a flowchart of a notification information stop notification receiving process.

FIG. 7 is a flowchart of normal out-of-service processing.

FIG. 8 is a flowchart of a reception process from a mobile station.

FIG. 9 is a flowchart of a reception process from an exchange.

FIG. 10 is a flowchart of a monitoring timer timeout process.

FIG. 11 is a flowchart of a connection process.

FIG. 12 is a flowchart of a release process.

FIG. 13 is a flowchart of an emergency communication slot reservation timer timeout process.

FIG. 14 is a flowchart of other processing.

FIG. 15 is a sequence diagram of an emergency call.

FIG. 16 is a sequence diagram of an emergency call.

FIG. 17 is a sequence diagram of an emergency call.

FIG. 18 is a diagram showing a state of each slot.

FIG. 19 is a sequence diagram of an emergency communication disconnection.

FIG. 20 is a diagram showing a telephone number status table.

FIG. 21 is a diagram showing a base station status table.

FIG. 22 is a diagram showing a disconnected mobile station registration table.

FIG. 23 is a diagram showing an emergency line reservation table.

FIG. 24 is a diagram showing an emergency communication connection waiting table.

FIG. 25 is a diagram showing a state of each slot.

FIG. 26 is a diagram showing a state of each slot.

FIG. 27 is a sequence diagram of a conventional method.

[Explanation of symbols]

 101 to 105 Mobile station 106, 107 Base station 108 Switch 109-111 Emergency call telephone 112, 113 General telephone 201, 304, 401 Central processing unit 202 Phone number status table 203 Base station status table 204 Disconnected mobile station registration table 205 Emergency line Reservation table 206 Emergency communication connection waiting table 207 Emergency communication control device 208 Voice guidance output device 209 Emergency call reception telephone number storage device 300, 400 Wireless device 305 Pair exchange device 405 Emergency call number table 407 Voice processing device 410 Display device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikimasa Yamagishi 1-5-5 Shimonopporo Techno Park, Atsubetsu-ku, Sapporo, Hokkaido Fujitsu Hokkaido Communication Systems Co., Ltd. No. 5 Fujitsu Hokkaido Communication System Co., Ltd. (72) Inventor Kazutaka Sato 1-5-5 Shimonopporo Techno Park, Atsubetsu-ku, Sapporo, Hokkaido 1 Fujitsu Hokkaido Communication System Co., Ltd. (72) Inventor Ryuhei Motono Sapporo, Hokkaido Fujitsu Hokkaido Communication Systems Co., Ltd. (72) Inventor Hisao Sakazume, Shimonopporo Techno Park 1-chome 1-chome Fujitsu Hokkaido Communication Systems Co., Ltd.

Claims (6)

[Claims] A mobile station within a service area of a base station has a predetermined number of communication lines, one of which is used for control,
And an emergency communication method of a cordless telephone system in which a base station is connected to a public line network via an exchange, wherein line information between the mobile station and the base station is managed by the exchange, and the mobile station or the public If there is no free line between the mobile station and the base station at the time of emergency call from the emergency reception telephone connected to the circuit network, disconnect the non-emergency communication line under the control of the exchange, and perform the emergency call communication. And an emergency communication method for a cordless telephone system. 2. The emergency communication method for a cordless telephone system according to claim 1, wherein information on the line of the non-emergency communication to be disconnected is stored in the exchange, and an idle line is provided between the mobile station and the base station. Occurs,
An emergency communication method for a cordless telephone system, wherein the disconnected non-emergency communication is restarted. 3. The emergency communication method for a cordless telephone system according to claim 1, wherein when the emergency call based on the emergency call is terminated, a line between the corresponding mobile station and the base station is opened for a predetermined time under the control of the exchange. An emergency communication method for a cordless telephone system. 4. The cordless telephone system according to claim 1, wherein the disconnection information is transmitted to the mobile station of the line to be disconnected under the control of the exchange by using the control line. Emergency communication method of telephone system. 5. A mobile station within a service area of a base station has a predetermined number of communication lines, one of which is used for control,
And an emergency communication method of a cordless telephone system in which a base station is connected to a public line network via an exchange, wherein line information between the mobile station and the base station is managed by the exchange, and the mobile station or the public When there is no available line between the mobile station and the base station when an emergency call is made from an emergency reception telephone connected to a circuit network, the communication for the emergency call is connected using the control line. Emergency communication method of cordless telephone system. 6. The emergency communication method for a cordless telephone system according to claim 5, wherein a mobile station within a service area of a corresponding base station is connected before an emergency call communication connection using the control line is established. An emergency communication method for a cordless telephone system, wherein the control line is notified of a stoppage of transmission of control information.