JP2001045554A - Radio subscriber system, line connection controller for the radio subscriber system and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a radio subscriber system to surely assign a radio channel for an emergency call even when the radio channel is in congestion on the occurrence of the emergency call and to accommodate non-emergency call and the emergency call without distinguishing them. SOLUTION: Line connection controllers 22, 24 are provided with a plurality of reservation radio channels that are not assigned to a call of a subscriber in a normal operating state but assigned to an emergency call. When the radio channel is in congestion and a call request comes newly from a subscriber, the line connection controllers 22, 24 assign one of a plurality of the reservation radio channels for the call. When the call is an emergency call, the line connection controllers 22, 24 continue the call, forcibly interrupt a radio channel having been assigned for a non-emergency call among calls used at present and release the interrupted radio channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a public switched telephone network (PSTN).
Among them, the present invention relates to a wireless subscriber system called a wireless local loop (WLL) in which a subscriber line from an exchange to a customer premises is made wireless, and particularly to a wireless subscriber system. The present invention relates to a line connection control device of a wireless subscriber system and a recording medium storing a program executable by a computer for realizing the function of the line connection control device of the wireless subscriber system.

[0002]

2. Description of the Related Art In a public switched telephone network, a line concentrator system located between an exchange and a subscriber's home is generally called an access network. An access network in which a wireless system is introduced is known. It is called a wireless local loop system.

This wireless subscriber system is a system for transparently transmitting an on-hook / off-hook state of a subscriber line, voice, incoming call, and the like, and detects an incoming call from an exchange and transmits it to a subscriber wireless terminal to make a telephone call. Call,
When a subscriber (user) raises the telephone receiver (off-hook), a wireless channel and a communication channel to the exchange are established, and a call can be made. In many cases, a conventional mobile telephone system is applied to the wireless subscriber system.

In such a radio subscriber system, when a channel used for a radio portion of a subscriber line is congested, a call is transmitted from a radio base station even if another subscriber terminal attempts to make a call. I am rejected and cannot make a call. This is generally affected by the number of wireless channels in the wireless subscriber system being less than the number of subscriber lines it accommodates, which means that when a wireless channel is congested, some subscribers This means that a call cannot be made even if an attempt is made to call a destination requiring urgency (for example, a police station or a fire department).

FIG. 6 shows the configuration of a conventional wireless subscriber system. In FIG. 1, an exchange 12 provided in the public switched telephone network 10 is provided with telephone lines 210A, 210B,... In subscriber premises via a subscriber line such as subscriber lines A and B and a wireless subscriber system 200 as an access network. ,It is connected to the. The wireless subscriber system 200 includes a line connection control device 202 connected to the exchange 12 via a subscriber line, and a subscriber wireless device as a subscriber terminal connected to the line connection control device 202 via a wireless channel. S
UA, SU-B,... The line connection control device 202 includes a function of a wireless base station.

The subscriber radio units SU-A, SU-B,...
Are installed in each subscriber's home, respectively, and each subscriber's wireless device SU-A, SU-B,.
A, 210B,... Are respectively connected. Here, it is assumed that the user B is a subscriber who attempts to call a destination requiring urgency, and the user A is a subscriber who is talking as a non-emergency call which is a call which does not require urgency. The subscriber wireless device SU-A installed in the home of the subscriber A is connected to the subscriber line A, and the subscriber wireless device SU-B installed in the home of the subscriber B is connected to the subscriber line B. As described above, the subscriber line and the subscriber wireless device have a one-to-one correspondence.

The control operation of the radio subscriber system 200 when the radio channel is congested will be described with reference to FIG. FIG. 7 shows an example in which the interface between the exchange 12 and the line connection control device 202 is a two-line analog line, and the line connection control device 202 and each subscriber wireless device SU-
A, SU-B,... Are used as PHS-compliant interfaces, and each of the subscriber wireless devices SU-A, SU-B,.
, And the corresponding subscriber telephones 210A, 210B,... Are two-line analog lines, and the subscriber line B and the user B try to make a call to an urgent destination when the radio channel is congested. FIG. 6 shows a control sequence in the case of performing the operation.

In the above configuration, when the subscriber line A and the user A are in a call and the telephone 210B of the user B is off-hook and a call notification is output to the subscriber's wireless device SU-B, the subscriber's The wireless device SU-B outputs a link channel establishment request message including the identification information of the calling terminal to the line connection control device 202.

When all of the radio channels are in use or cannot be used, the line connection control unit 202 sends a message to the subscriber radio unit SU- to reject the assignment of the link channel for the call by the user B requesting the call. B to the telephone set 2 of the user B from the subscriber's wireless unit SU-B.
A busy tone indicating that the wireless channel is in use is transmitted to 10B. As a result, the user B is
The receiver of 0B is put down (on-hook), and an end signal is output from the telephone set 210B to the subscriber's wireless unit SU-B.

[0010]

In the above-described wireless subscriber system, when the wireless channel is in a congested state, even if a call request as an emergency call occurs, the assignment of the link channel is rejected. When an emergency call occurs, there is a problem that a radio channel cannot be reliably assigned to the emergency call.

The present invention has been made in view of such circumstances, and when there is a call request (emergency call) from a subscriber who calls an urgent destination, the radio channel is in a congested state. Even if a wireless subscriber system and a wireless subscriber can securely allocate a wireless channel for an emergency call and can accommodate a normal call (non-emergency call) and an emergency call without distinction It is an object of the present invention to provide a recording medium on which a program for realizing the functions of the line connection control device of the system and the line connection control device of the wireless subscriber system is recorded.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber of a public switched telephone network exchange are added. In a wireless subscriber system having a wireless channel connected via a subscriber line and set between itself and a subscriber wireless device, and a line connection controller for controlling the connection of the subscriber line, the subscriber in a normal operation state A plurality of reserved radio channels to be used for emergency calls, which are urgent calls, are not allocated to outgoing calls, and when a radio channel is congested, a call request is newly issued from the subscriber. In the case where the
Radio channel assigned to the outgoing call, and if the outgoing call is an emergency call, the call is continued, and a non-emergency call that is a current call that does not require urgency is assigned to the call. Is forcibly disconnected and the disconnected wireless channel is released.

According to a second aspect of the present invention, there is provided a subscriber radio apparatus installed in a subscriber's home and connected to a telephone, and a subscriber radio apparatus connected to an exchange of a public switched telephone network via a subscriber line. In a wireless subscriber system having a wireless channel set between the above and a line connection control device for controlling connection of the subscriber line, a telephone number of a specific destination requiring urgency and an emergency call which is an urgent call For this reason, a plurality of reserved radio channels to be used are registered in advance, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, one of the plurality of reserved radio channels is And the telephone number dialed based on the call request matches with the registered telephone number of the specific destination requiring urgency. It is determined whether or not the call is an emergency call. If the call is an emergency call, the call is continued, and the radio assigned to a non-emergency call that is a call that does not require urgency among calls that are currently in progress. Forcibly disconnecting the channel and releasing the disconnected wireless channel.

According to a third aspect of the present invention, there is provided a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. In a wireless subscriber system having a wireless channel set between and a line connection control device that performs connection control of the subscriber line, the subscriber wireless device,
When a subscriber makes a call, a call request message including subscriber identification information is sent to the line connection control device, and the line connection control device transmits a call request message received from the subscriber wireless device. Subscriber identification information extraction means for extracting subscriber identification information, telephone number of a specific destination requiring urgency, the number of reserved radio channels to be used for an emergency call which is an urgent call, and setting by a radio subscriber system Storage means for pre-registering the number of all possible radio channels and storing the number of currently used radio channels; and the number of reserved channels, the total number of radio channels and the currently used radio number stored in the storage means. It is determined whether or not the wireless channel is in a congestion state based on each data of the number of channels. If the wireless channel is in a congestion state, a call request is issued. In this case, it is determined whether the outgoing call is an emergency call based on whether the telephone number dialed based on the outgoing call request matches the registered telephone number of the specific destination requiring urgency. Determining means for determining, and if the calling is determined to be an emergency call by the determining means, the call is continued and a non-emergency call, which is a call that does not require urgency among calls currently in communication, is performed. Wireless channel connection control means for forcibly disconnecting the allocated wireless channel and releasing the disconnected wireless channel.

According to the first, second and third aspects of the present invention,
A subscriber wireless device installed in a subscriber premises and connected to a telephone, a wireless channel connected to a switch of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber line In a wireless subscriber system having a line connection control device that performs connection control, a plurality of reserved wireless channels used for an emergency call which is an urgent call that is not allocated to a call made by the subscriber in a normal operation state. In the case where the radio channel is congested and there is a new call request from a subscriber, one of the plurality of reserved radio channels is assigned to the call and the call If is an emergency call, continue the call,
And forcibly disconnect the radio channel assigned to a non-emergency call that is a call that does not require urgency among calls currently in progress,
Since the disconnected wireless channel is released,
When there is a call request from a subscriber who calls an urgent destination, even if the radio channel is congested, the radio channel can be reliably allocated for an emergency call and the normal Calls (non-emergency calls) and emergency calls can be accommodated without distinction, and channel resources can be used effectively.

According to a fourth aspect of the present invention, there is provided a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. In a wireless subscriber system having a wireless channel set between and a line connection control device that performs connection control of the subscriber line, the subscriber wireless device,
When a subscriber makes a call, a call request message including subscriber identification information is sent to the line connection control device, and the line connection control device transmits a call request message received from the subscriber wireless device. Subscriber identification information extraction means for extracting subscriber identification information, telephone number of a specific destination requiring urgency, the number of reserved radio channels to be used for an emergency call which is an urgent call, and setting by a radio subscriber system First storage means for pre-registering the total number of possible wireless channels and storing the number of currently used wireless channels; subscriber identification information extracted by the subscriber identification information extracting means; Second storage means for storing a call duration of a call during a call in association with information; and the number of reserved channels, the total number of wireless channels, and Determine whether the wireless channel is in a congested state based on each data of the number of wireless channels in use, and when the wireless channel is in a congested state, when there is a call request Whether the call is an emergency call depends on whether the telephone number dialed based on the call request matches the telephone number of a specific urgent destination registered in the first storage means. Determining means for determining whether or not the call is an emergency call; determining that the call is an emergency call, while continuing the call, referring to the storage content of the second storage means, Wireless channel connection control means for forcibly disconnecting a wireless channel allocated to a call having the longest talk time among non-emergency calls which are calls requiring no urgency and releasing the disconnected wireless channel. To have And butterflies.

According to the fourth aspect of the present invention, when the radio channel is in a congested state, when a call request is made, the telephone number dialed based on the call request is registered. It is determined whether or not the outgoing call is an emergency call based on whether it matches the telephone number of a specific destination requiring urgency, and if the outgoing call is determined to be an emergency call, the call And forcibly disconnect the radio channel assigned to the call with the longest talk time among the non-emergency calls that are currently not in need of emergency and release the disconnected radio channel. Therefore, in addition to the effect obtained by the third aspect of the invention, an effect that channel resources can be rationally operated can be obtained.

According to a fifth aspect of the present invention, there is provided a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. In a line connection control device of a wireless subscriber system having a wireless channel set between the above and a line connection control device for controlling connection of the subscriber line, in a normal operation state, a call is not allocated to a subscriber call. A plurality of reserved radio channels to be used for an emergency call which is an urgent call are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, the plurality of reserved radio channels are set. Non-emergency call, which is a call which is not required to be urgent among calls currently in progress, while allocating one of the reserved radio channels to the outgoing call and continuing the call if the outgoing call is an emergency call. Divided into The hit was radio channel forcibly disconnected, characterized by releasing the lost radio channel.

According to a sixth aspect of the present invention, there is provided a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. A line connection control device of a wireless subscriber system having a wireless channel set between the above and a line connection control device for controlling connection of the subscriber line, wherein a telephone number of a specific destination requiring urgency and urgency is required. A plurality of reserved radio channels to be used for an emergency call, which is a call, are registered in advance, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, the plurality of reserved radio channels are registered. Assign one of the channels to the outgoing call and the telephone number dialed based on the outgoing call request matches the registered urgent destination telephone number It is determined whether the outgoing call is an emergency call based on whether or not the call is an emergency call. If the call is an emergency call, the call is continued, and a non-emergency The wireless channel assigned to the call is forcibly disconnected and the disconnected wireless channel is released.

According to a seventh aspect of the present invention, there is provided a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. A line connection control device for a wireless subscriber system having a wireless channel set during the connection and a line connection control device for controlling connection of the subscriber line. Subscriber identification information extraction means for extracting user identification information, telephone numbers of specific destinations requiring urgency, the number of reserved radio channels to be used for emergency calls that are urgent calls, and can be set by the radio subscriber system Storage means for pre-registering the total number of wireless channels and storing the number of currently used wireless channels; and the reserved channel stored in the storage means. It is determined whether or not the wireless channel is in a congested state based on the data of the total number of wireless channels and the number of currently used wireless channels. If the wireless channel is in a congested state, a call request is issued. The telephone number dialed based on the call request,
Determining means for determining whether the outgoing call is an emergency call based on whether or not the registered phone number of the specific urgent party is urgent; and determining that the outgoing call is an emergency call by the determining means. If it is determined that there is, continue the call,
Wireless channel connection control means for forcibly disconnecting a wireless channel allocated to a non-emergency call that is a call that does not require urgency among calls currently in progress and releasing the disconnected wireless channel It is characterized by.

According to the invention described in claims 5, 6, and 7,
A subscriber wireless device installed in a subscriber premises and connected to a telephone, a wireless channel connected to a switch of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber line In a line connection control device of a wireless subscriber system having a line connection control device for performing connection control of a subscriber, in a normal operation state, the call is not assigned to a call from the subscriber and is used for an emergency call which is an urgent call. A plurality of reserved radio channels are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, one of the plurality of reserved radio channels is assigned to the call. In addition, if the outgoing call is an emergency call, the call is continued, and the wireless channel allocated to the non-emergency call which is a call that does not require urgency among the calls currently in progress is forcibly disconnected. Since the disconnected radio channel is released, even if the radio channel is in a congested state when there is a call request from a subscriber who calls an urgent destination, an emergency call can be made. Radio channel can be reliably assigned and normal calls (non-emergency calls)
And emergency calls can be accommodated without distinction, and channel resources can be effectively utilized.

The invention according to claim 8 provides a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. A line connection control device for a wireless subscriber system having a wireless channel set during the connection and a line connection control device for controlling connection of the subscriber line. Subscriber identification information extraction means for extracting user identification information, telephone numbers of specific destinations requiring urgency, the number of reserved radio channels to be used for emergency calls that are urgent calls, and can be set by the radio subscriber system The total number of wireless channels is registered in advance, and is extracted by the first storage means for storing the number of currently used wireless channels and the subscriber identification information extracting means. Second storage means for storing subscriber identification information and call duration of a call during a call in association with the subscriber identification information; the number of reserved channels stored by the first storage means; It is determined whether or not the wireless channel is in a congested state based on each data of the number and the number of currently used wireless channels, and when the wireless channel is in a congested state, there is a call request. The call is an emergency call depending on whether the telephone number dialed based on the call request matches the telephone number of a specific urgent destination registered in the first storage means. Determining means for determining whether there is a call, and when the determining means determines that the outgoing call is an emergency call, the call is continued and the contents stored in the second storage means are referred to. , The current call Wireless channel connection control means for forcibly disconnecting a wireless channel allocated to a call having the longest talk time among non-emergency calls which do not require a call, and releasing the disconnected wireless channel. And

According to the eighth aspect of the present invention, when the radio channel is in a congested state, when a call request is made, the telephone number dialed based on the call request is registered. It is determined whether or not the outgoing call is an emergency call based on whether it matches the telephone number of a specific destination requiring urgency, and if the outgoing call is determined to be an emergency call, the call And forcibly disconnect the radio channel assigned to the call with the longest talk time among the non-emergency calls that are currently not in need of emergency and release the disconnected radio channel. Therefore, in addition to the effect obtained by the invention according to claim 7, an effect that channel resources can be rationally operated can be obtained.

According to a ninth aspect of the present invention, there is provided a subscriber wireless device installed in a subscriber's home and connected to a telephone, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. In a line connection control device of a wireless subscriber system having a wireless channel set between the above and a line connection control device for controlling connection of the subscriber line, in a normal operation state, a call is not allocated to a subscriber call. A plurality of reserved radio channels to be used for an emergency call which is an urgent call are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, the plurality of reserved radio channels are set. Non-emergency call, which is a call which is not required to be urgent among calls currently in progress, while allocating one of the reserved radio channels to the outgoing call and continuing the call if the outgoing call is an emergency call. Divided into Computer for storing a program for realizing the function of the line connection control device of the wireless subscriber system, characterized in that the assigned wireless channel is forcibly disconnected and the disconnected wireless channel is released. And a simple recording medium.

According to the ninth aspect of the present invention, a subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. And a line connection control device for controlling connection of the subscriber line, wherein the line connection control device is configured to assign a call to a subscriber in a normal operation state. A plurality of reserved radio channels to be used for an emergency call that is an urgent call are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, the One of a plurality of reserved radio channels is assigned to the outgoing call, and if the outgoing call is an emergency call, the call is continued, and a non-emergency call that is a current call that does not require urgency. To call A program to be executed by a computer for realizing a function of a line connection control device of a wireless subscriber system, wherein the assigned wireless channel is forcibly disconnected and the disconnected wireless channel is released. Was recorded on a computer-readable recording medium, so that the program recorded on this recording medium was read by a computer system,
By executing this, when there is a call request from a subscriber who calls an urgent destination, even if the radio channel is congested, the radio channel can be reliably allocated for an emergency call Normal call (non-emergency call)
And emergency calls can be accommodated without distinction, and channel resources can be effectively utilized.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a schematic configuration of a wireless subscriber system according to an embodiment of the present invention. In FIG. 1, an exchange 12 provided in the public switched telephone network 10 has telephone lines 30A, 30B,... In subscriber premises via a subscriber line such as subscriber lines A and B, and a wireless subscriber system 20 as an access network. ,It is connected to the.

The wireless subscriber system 20 includes an access controller (AC) 22 connected to the exchange 12 via a subscriber line, and an access controller (AC) 22.
And a base station (BS) 24 for controlling connection of a radio channel set between the base station and the subscriber radio apparatus, and subscriber radio apparatuses SU-A (user A) and SU- as subscriber terminals. B (user B),...

The subscriber wireless units SU-A, SU-B,...
Are installed in each subscriber's home, respectively, and each subscriber's wireless device SU-A, SU-B,.
A, 30B,... Are connected respectively. here,
It is assumed that the user B is a subscriber who calls a destination requiring urgency, and the user A is a subscriber who is talking as a non-emergency call which is a call not requiring urgency. The subscriber wireless unit SU-A installed in the subscriber A's home is connected to the subscriber line A, and the subscriber wireless unit S-A installed in the subscriber B's home.
The subscriber line and the subscriber wireless device have a one-to-one correspondence so that UB is connected to the subscriber line B.

Next, a specific configuration of the access controller (AC) 22 and the radio base station 24 is shown in FIG. In the figure, an access controller (AC) 22
A call signal detecting unit 40 for detecting a call signal (Ring) from a telephone, and, when a call request is made, a telephone number dialed based on the call request is stored in a registered specific emergency destination. An emergency call / non-emergency call determination processing unit 42 for determining whether or not the call is an emergency call based on whether or not it matches the destination telephone number; an emergency telephone number, which is a telephone number of a destination requiring emergency; (Refers to data of the number of reserved radio channels used for an emergency call, the total number of radio channels that can be set by the radio subscriber system, and the number of radio channels in use). And a wireless channel number storage device 44.

The emergency call / non-emergency call determination processing unit 42 corresponds to the determination unit of the present invention, and the emergency telephone number / wireless channel number storage device 44 corresponds to the first storage unit of the present invention.
Further, the radio base station 24 includes a radio transmission / reception circuit 50 for transmitting / receiving a message relating to connection / disconnection of a radio channel to / from the subscriber radio apparatus, and a message protocol processing unit 52
Subscriber identification information identifying the subscriber of the active call;
A subscriber identification information / talk time storage device 54 for storing the call time of the subscriber, and a timer (or clock) for measuring the call time of the call during the call and outputting the measured time to the subscriber identification information / talk time storage device 54 ) And the like.

In this embodiment, the emergency telephone number / wireless channel number storage device 44 is used as an access controller (A
C) Although it is provided in the base station 22, it may be provided in the radio base station 24. Access controller (AC) 22
And the wireless base station 24 correspond to the line connection control device of the present invention, and the subscriber identification information / talk time storage device 54 corresponds to the second storage means of the present invention. The message protocol processing section 52 includes the subscriber identification information extracting means of the present invention.

The control operation when the radio channel in the radio subscriber system 20 is congested will be described with reference to FIGS. FIGS. 3 and 4 show connection and disconnection control of a wireless channel when an emergency call is generated from a subscriber wireless device as a subscriber terminal in a state where the wireless channel is in a congested state. FIG. 4 shows a control sequence.

In the above configuration, the subscriber line A and the user A (telephone 30A) are currently in a call, and the two-line analog line is off-hook by the user B picking up the handset of the telephone 30B, and the call notification is subscribed. Wireless device SU
Output to −B. Upon detecting the call notification (off-hook), the subscriber wireless device SU-B causes the wireless transceiver circuit 50 of the wireless base station 24 to transmit the subscriber wireless device SU as a calling terminal.
A link channel establishment request message including the subscriber identification information of -B (the PSID in the present embodiment) is output. The PSID (Personal Station ID) is a terminal identification value fixedly assigned to each subscriber.

The radio transmission / reception circuit 50 of the radio base station 24 receives the link channel establishment request message and sends it to the message protocol processing unit 52 (step 100).
The message protocol processing unit 52 extracts the subscriber identification information (PSID) of the subscriber wireless device SU-B from the link channel establishment request message, and stores the subscriber identification information in the subscriber identification information / talk time storage device 54 and the emergency The call / non-emergency call determination processing unit 42 is output.

The emergency call / non-emergency call determination processing unit 42 determines whether the radio channel is in a congested state (step 101). That is, the emergency call / non-emergency call determination processing unit 42
Is the number stored in the emergency telephone number / wireless channel number storage device 44, i.e., the number of reserved wireless channels used for an emergency call, the total number of wireless channels that can be set by the wireless subscriber system, Referring to each data of the number of channels, if the number of radio channels in use is equal to or greater than a value obtained by subtracting the number of reserved radio channels from the number of all radio channels, the radio channel is determined to be congested, otherwise, It is determined that it is not in the congestion state.

If the determination in step 101 is denied, then in step 111 one of the idle channels (empty channels within the range of the number of channels obtained by subtracting the number of reserved wireless channels from the total number of wireless channels) is issued. Allocate to the call requesting, and then send a link channel assignment message to the subscriber terminal that requested the call (step 11).
3), this process ends.

On the other hand, if the determination in step 101 is affirmative, that is, if the radio channel is in a congested state, in step 102, one of the reserved radio channels is allocated to a call that has requested calling. After the allocation of the link channel, transmission and reception of a synchronous burst signal are performed between the base station 24 and the subscriber unit SU-B. Then, the base station side is transmitted from the subscriber unit SU-B to the base station 24 in the asynchronous balanced mode. SABM (Set Asynchronous B)
alanced Mode) command is sent. After that, the U reports that it accepts the SABM command from the base station 24.
An A (Unnumbered Acknowledge) response is transmitted to the subscriber wireless device SU-B. As a result, a data link is established between the base station 24 and the subscriber unit SU-B.

Next, at step 103, a call setting process is performed. That is, first, a call setup message is sent from the subscriber's radio apparatus SU-B to the base station 24 side, and a call request is made. On the other hand, the base station 24 checks the subscriber data of the caller, and returns the call setting acceptance message to the subscriber wireless device SU-B if the caller is in the call state. Next, a paging message and a response message are sent from the base station 24 to the subscriber's wireless unit SU-B, after which a call notification (off-hook) is sent to the base station 24 and the access controller 2
2 to the subscriber line B. As a result, a dial tone is output from the subscriber line B to the telephone set 30B of the user B.

User B dials the DTM
The F tone (or pulse) is transmitted from the telephone 30B to the subscriber line B as dial information. At this time, the emergency call / non-emergency call determination processing unit 4 in the access controller 22
In step 2, each digit of the telephone number based on the DTMF tone is referred to the emergency telephone number / wireless channel number storage device 44 up to the last digit to determine whether or not the telephone number is registered as an emergency telephone number. Check whether the outgoing call by the user B is an emergency call (Step 1)
04).

If the determination in step 104 is negative,
That is, when it is determined that the call by the user B is not an emergency call, the process of disconnecting the wireless channel is performed in step 112, and the process ends. Step 10
If the determination of No. 4 is affirmative, that is, if it is determined that the outgoing call by the user B is an emergency call, the ring tone from the subscriber line B to the telephone B of the user B at the time when the last dialing operation is completed. Is transmitted, and the state shifts to a call state (step 105).

Next, at step 106, the emergency call / non-emergency call determination processing unit 42 refers to the storage contents of the emergency telephone number / wireless channel number storage device 44 and the subscriber identification information / talk time storage device 54, and is busy. The call which is a non-emergency call and has the longest talk time among the calls is selected as a call to be disconnected, and the selected call to be disconnected is reported to the message protocol processing unit 52 (step 106). In the present embodiment, a call by user A connected to subscriber line A is selected as a call to be disconnected. Next, a special tone indicating that the radio channel is disconnected due to the occurrence of an emergency call to both of the callers of the call to be disconnected, ie, the user A side and the subscriber line A side, is transmitted from the base station 24, specifically, a message protocol. It is output from the processing unit 52 (step 107).

Next, the subscriber line A and the subscriber wireless unit SU
The processing of disconnecting the wireless channel set between the wireless communication apparatus and -A is performed (steps 108 to 109). That is, the base station 2
An end signal (on-hook) is output from the 4 side to the subscriber line A, and at the same time, a disconnection message is sent to the subscriber wireless unit SU-A (step 108). On the other hand, the subscriber's wireless unit SU-A sends a release message for call release to the base station 24 side, and at the same time, the telephone 3
Send a busy tone to OA. Thereafter, a release completion message is sent from the base station 24 to the subscriber's radio unit SU-A, and D is sent from the subscriber's radio unit SU-A to the base station 24 side.
An ISC (DISConnect) command is sent (step 109).

On the other hand, a UA (Unnumbered) reporting that the DISC command has been accepted from the base station 24 side.
Acknowledgment) response is sent to the subscriber wireless device SU-A. As a result, the wireless channel is released. As a result, the number of reserved radio channels prepared for the emergency call is restored. That is, the state returns to a state where all of the reserved wireless channels are secured. When user A goes on-hook in response to the busy tone, telephone A outputs an end signal (on-hook) to subscriber wireless device SU-A.

The subscriber radio unit installed in the subscriber's home and connected to the telephone set shown in FIGS. 1 to 5, and the subscriber radio unit connected to the exchange of the public switched telephone network via the subscriber line. In a line connection control device of a wireless subscriber system having a wireless channel set between the above and a line connection control device for controlling connection of the subscriber line, in a normal operation state, a call is not allocated to a subscriber call. A plurality of reserved radio channels to be used for an emergency call which is an urgent call are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, the plurality of reserved radio channels are set. Non-emergency call, which is a call which is not required to be urgent among calls currently in progress, while allocating one of the reserved radio channels to the outgoing call and continuing the call if the outgoing call is an emergency call. Divided into A program for executing by a computer for realizing the function of the line connection control device of the wireless subscriber system, which forcibly disconnects the allocated wireless channel and releases the disconnected wireless channel. The functions of the line connection control device of the wireless subscriber system may be realized by recording the program recorded on a recording medium readable by a computer and causing the computer system to read and execute the program recorded on the recording medium.

The "computer system" used herein includes a case where the system is realized as an embedded system using a microprocessor or the like and a case where the system is realized as hardware such as an OS and peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a floppy disk or a magneto-optical disk, or a storage device such as a ROM, a RAM, or a hard disk built in a computer system.

Further, a “computer-readable recording medium” refers to a program that is dynamically stored in a short time, such as a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line. The storage means (transmission medium or transmission wave) and, in that case, the storage means for storing a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client.

The above program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

As described above, according to the wireless subscriber system according to the embodiment of the present invention, the subscriber's wireless device installed in the subscriber's house and connected to the telephone, and subscribes to the exchange of the public switched telephone network. In a wireless subscriber system having a wireless channel connected via a subscriber line and set between itself and a subscriber wireless device, and a line connection controller for controlling the connection of the subscriber line, the subscriber in a normal operation state A plurality of reserved radio channels to be used for emergency calls, which are urgent calls, are not allocated to outgoing calls, and when a radio channel is congested, a call request is newly issued from the subscriber. If one of the reserved radio channels is assigned to the outgoing call, the call is continued, if the outgoing call is an emergency call, and the urgent one of the currently active calls is required. Since the wireless channel allocated to the non-emergency call, which is a non-emergency call, is forcibly disconnected and the disconnected wireless channel is released, there is a call request from a subscriber who calls an emergency destination. In this case, even if the radio channel is congested, the radio channel can be reliably allocated for an emergency call, and a normal call (non-emergency call) and an emergency call can be accommodated without distinction. And channel resources can be used effectively.

According to the radio subscriber system according to the embodiment of the present invention, when the radio channel is in a congested state and a call request is made, the telephone dialed based on the call request is performed. It is determined whether or not the outgoing call is an emergency call based on whether the number matches the registered telephone number of the specific destination requiring urgency, and it is determined that the outgoing call is an emergency call In this case, the call is continued, and the wireless channel allocated to the call with the longest talk time among the non-emergency calls that are currently not in need of urgency and are not urgent is forcibly disconnected, and the disconnected call is disconnected. Since the wireless channel is released, an effect that channel resources can be rationally operated can be obtained in addition to the effect obtained by the third aspect of the present invention.

Further, according to the wireless subscriber system according to the embodiment of the present invention, the subscriber wireless device installed in the subscriber's house and connected to the telephone, and the exchange of the public switched telephone network via the subscriber line. In a line connection control device of a wireless subscriber system having a wireless channel connected to and set up with a subscriber wireless device and a line connection control device for controlling connection of the subscriber line, a subscriber in a normal operation state A plurality of reserved radio channels to be used for emergency calls, which are urgent calls, are not allocated to outgoing calls, and when a radio channel is congested, a call request is newly issued from the subscriber. If one of the plurality of reserved radio channels is assigned to the outgoing call, and if the outgoing call is an emergency call, the call is continued. Since the wireless channel assigned to the non-emergency call, which is a call not to be made, is forcibly disconnected and the disconnected wireless channel is released, a call request from a subscriber who calls the urgent destination is reduced. If there is, even if the radio channel is congested, the radio channel can be reliably allocated for an emergency call, and a normal call (non-emergency call) and an emergency call can be accommodated without discrimination. Channel resources can be effectively utilized.

Further, according to the radio subscriber system according to the embodiment of the present invention, when the radio channel is congested, if a call request is made, the telephone dialed based on the call request is performed. It is determined whether or not the outgoing call is an emergency call based on whether the number matches the registered telephone number of the specific destination requiring urgency, and it is determined that the outgoing call is an emergency call In this case, the call is continued, and the wireless channel allocated to the call with the longest talk time among the non-emergency calls that are currently not in need of urgency and are not urgent is forcibly disconnected, and the disconnected call is disconnected. Since the wireless channel is released, if there is a call request from a subscriber who calls an urgent destination, even if the wireless channel is congested, the wireless channel will be released for an emergency call. Can be assigned reliably Along with the kill, normal call (non-emergency call)
And emergency calls can be accommodated without distinction, so that channel resources can be used effectively, and channel resources can be rationally operated.

Further, according to the radio subscriber system according to the embodiment of the present invention, the subscriber's radio device installed in the subscriber's home and connected to the telephone and the exchange of the public switched telephone network via the subscriber line. In a line connection control device of a wireless subscriber system having a wireless channel connected to and set up with a subscriber wireless device and a line connection control device for controlling connection of the subscriber line, a subscriber in a normal operation state A plurality of reserved radio channels to be used for emergency calls, which are urgent calls, are not allocated to outgoing calls, and when a radio channel is congested, a call request is newly issued from the subscriber. If one of the plurality of reserved radio channels is assigned to the outgoing call, and if the outgoing call is an emergency call, the call is continued. A function for forcibly disconnecting a wireless channel allocated to a non-emergency call, which is a call not to be performed, and releasing the disconnected wireless channel. Since the program to be executed by the computer is recorded on a recording medium readable by the computer, the program recorded on the recording medium is read into a computer system and executed to call an emergency destination. When there is a call request from the subscriber, even if the radio channel is in a congested state, the radio channel can be reliably allocated for an emergency call, and a normal call (non-emergency call) and an emergency call can be made. Calls can be accommodated without distinction, and channel resources can be effectively used.

[0053]

As described above, claims 1 and 2,
According to the third aspect of the present invention, there is provided a setting between the subscriber wireless device installed in the subscriber's home and connected to the telephone, and the subscriber wireless device connected to the exchange of the public switched telephone network via the subscriber line. In a wireless subscriber system having a wireless channel to be connected and a line connection control device for controlling connection of the subscriber line, an emergency call which is an emergency call which is not assigned to a call originated by the subscriber in a normal operation state. A plurality of reserved radio channels to be used are provided in advance, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, one of the plurality of reserved radio channels is set to the In addition to assigning a call to an outgoing call, if the call is an emergency call, the call is continued, and a radio channel assigned to a non-emergency call, which is a call that does not require urgency among calls in progress, is forcibly set. To Since the call is disconnected and the disconnected radio channel is released, if a call request is issued from a subscriber who calls an urgent destination, even if the radio channel is in a congested state, an emergency call can be made. Wireless channel can be reliably allocated for normal calls (non-emergency calls)
And emergency calls can be accommodated without distinction, and channel resources can be effectively utilized.

According to the fourth aspect of the present invention, when the radio channel is in a congested state, when a call request is made, the telephone number dialed based on the call request is registered. It is determined whether or not the outgoing call is an emergency call based on whether or not it matches the telephone number of a specific destination requiring urgency, and if the outgoing call is determined to be an emergency call, Continuing the call, forcibly disconnecting the radio channel allocated to the call with the longest talk time among non-emergency calls that are currently in emergency and requiring no emergency, and releasing the disconnected radio channel As a result, in addition to the effect obtained by the third aspect of the invention, the effect that channel resources can be rationally operated can be obtained.

According to the fifth, sixth, and seventh aspects of the present invention, a subscriber's wireless device installed in a subscriber's home and connected to a telephone set is connected to an exchange of a public switched telephone network via a subscriber line. A line connection controller for a wireless subscriber system having a wireless channel set between the subscriber wireless device and a line connection controller for controlling connection of the subscriber line. A plurality of reserved radio channels to be used for an emergency call which is an urgent call that is not allocated to an outgoing call is provided, and when the radio channel is congested, there is a new call request from a subscriber. In this case, one of the plurality of reserved radio channels is assigned to the outgoing call, and if the outgoing call is an emergency call, the call is continued, and no urgent call is required among the current calls. In a call Since the wireless channel allocated to the non-emergency call is forcibly disconnected and the disconnected wireless channel is released, when a call request is issued from a subscriber who calls an emergency destination Can reliably allocate a radio channel for emergency calls even when the radio channel is congested, and can accommodate normal calls (non-emergency calls) and emergency calls without distinction Channel resources can be used effectively.

According to the present invention, when a call request is made when the radio channel is in a congested state, the telephone number dialed based on the call request is registered. It is determined whether or not the outgoing call is an emergency call based on whether or not it matches the telephone number of a specific destination requiring urgency, and if the outgoing call is determined to be an emergency call, Continuing the call, forcibly disconnecting the radio channel allocated to the call with the longest talk time among non-emergency calls that are currently in emergency and requiring no emergency, and releasing the disconnected radio channel Thus, in addition to the effect obtained by the invention described in claim 7, an effect that channel resources can be rationally used can be obtained.

According to the ninth aspect of the present invention, a subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a subscriber wireless device connected to an exchange of a public switched telephone network via a subscriber line. And a line connection control device for controlling connection of the subscriber line, wherein the line connection control device is configured to assign a call to a subscriber in a normal operation state. A plurality of reserved radio channels to be used for an emergency call that is an urgent call are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, the One of a plurality of reserved radio channels is assigned to the outgoing call, and if the outgoing call is an emergency call, the call is continued, and a non-emergency call that is a current call that does not require urgency. To call A program to be executed by a computer for realizing a function of a line connection control device of a wireless subscriber system, wherein the assigned wireless channel is forcibly disconnected and the disconnected wireless channel is released. Was recorded on a computer-readable recording medium, so that the program recorded on this recording medium was read by a computer system,
By executing this, when there is a call request from a subscriber who calls an urgent destination, even if the radio channel is congested, the radio channel can be reliably allocated for an emergency call Normal call (non-emergency call)
And emergency calls can be accommodated without distinction, and channel resources can be effectively utilized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a wireless subscriber system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration of an access controller and a wireless base station in the wireless subscriber system in FIG. 1;

FIG. 3 is a flowchart showing a control operation of an access controller and a wireless base station in the wireless subscriber system shown in FIG. 2;

4 is a flowchart showing a control operation of an access controller and a wireless base station in the wireless subscriber system shown in FIG.

FIG. 5 is a sequence diagram showing a control operation of the wireless subscriber system shown in FIG. 2;

FIG. 6 is a block diagram showing a configuration of a conventional wireless subscriber system.

FIG. 7 is a sequence diagram showing a control operation of the conventional wireless subscriber system shown in FIG.

[Explanation of symbols]

Reference Signs List 10 public switched telephone network 12 exchange 20 access network 22 access controller (line connection control device) 24 radio base station (line connection control device) 30A, 30B telephone 40 call signal detection unit 42 emergency call / non-emergency call judgment processing unit (judgment) Means) 44 Emergency telephone number / wireless channel number storage device 50 Wireless transmission / reception circuit 52 Message protocol processing section (subscriber identification information extracting means) 54 Subscriber identification information / talk time storage device 56 Clock device

Claims (9)

[Claims] 1. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to a switch of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. And a line connection control device for performing connection control of the subscriber line, wherein in a normal operation state, the call is not allocated to a call from the subscriber and is used for an emergency call which is an urgent call. A plurality of reserved radio channels are provided, and when the radio channel is in a congested state, when a call request is newly issued from a subscriber, one of the plurality of reserved radio channels is assigned to the call. And, when the outgoing call is an emergency call, continue the call, and forcibly disconnect a radio channel assigned to a non-emergency call that is a call that does not require urgency among calls currently in progress, The Wireless subscriber system, characterized in that to release the cross-sectional radio channels. 2. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to a switch of a public switched telephone network via a subscriber line and set between the subscriber's wireless device. And a line connection control device for controlling connection of the subscriber line, wherein a telephone number of a specific destination requiring urgency and a plurality of reserved radios used for an emergency call which is an urgent call. When a channel is registered in advance and one of the plurality of reserved wireless channels is assigned to the outgoing call when there is a new call request from the subscriber when the wireless channel is in a congested state, Whether or not the outgoing call is an emergency call, based on whether or not the telephone number dialed based on the outgoing call request matches the registered emergency telephone number of the other party. If the call is an emergency call, the call is continued, and the radio channel allocated to the non-emergency call, which is a call that does not require urgency among the calls currently in communication, is forcibly disconnected, and the disconnected A wireless subscriber system, wherein the wireless channel is released. 3. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to an exchange of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. And a line connection control device for controlling connection of the subscriber line, wherein the subscriber wireless device transmits subscriber identification information to the line connection control device when a subscriber makes a call. The line connection control device sends out a call request message including the call request message received from the subscriber wireless device, and extracts the subscriber identification information from the call request message. The telephone number of the other party, the number of reserved radio channels to be used for an emergency call that is an urgent call, and the total number of radio channels that can be set by the wireless subscriber system are registered in advance. Both storage means for storing the number of currently used radio channels, and the radio channel based on the data of the number of reserved channels, the total number of radio channels and the number of currently used radio channels stored in the storage means Determine whether or not is a congestion state, when the wireless channel is in a congestion state, if there is a call request, the telephone number dialed based on the call request, the registered Judgment means for judging whether or not the outgoing call is an emergency call based on whether or not it matches the telephone number of a specific destination requiring urgency, and judging that the outgoing call is an emergency call by the judging means In this case, the call is continued, the radio channel allocated to the non-emergency call which is a call that does not require urgency among the current calls is forcibly disconnected, and the disconnected radio channel is released. Yo Wireless subscriber system, comprising a radio channel connection control means. 4. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to a switch of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. And a line connection control device for controlling connection of the subscriber line, wherein the subscriber wireless device transmits subscriber identification information to the line connection control device when a subscriber makes a call. The line connection control device sends out a call request message including the call request message received from the subscriber wireless device, and extracts the subscriber identification information from the call request message. The telephone number of the other party, the number of reserved radio channels to be used for an emergency call that is an urgent call, and the total number of radio channels that can be set by the wireless subscriber system are registered in advance. First storage means for storing the number of wireless channels currently in use; subscriber identification information extracted by the subscriber identification information extraction means; Second storage means for storing time; and the wireless channel being congested based on the data of the number of reserved channels, the number of all wireless channels, and the number of currently used wireless channels stored in the first storage means. And determining whether or not the telephone number is in a congested state, and when a call request is issued, the telephone number dialed based on the call request is the first number. Determining means for determining whether or not the outgoing call is an emergency call based on whether or not it matches the telephone number of a specific destination requiring urgency registered in the storage means; In a call If it is determined that the call is continued, the call duration is the longest among the non-emergency calls that are currently in a call and do not require an emergency while referring to the storage contents of the second storage means. Wireless channel connection control means for forcibly disconnecting a wireless channel allocated to a call and releasing the disconnected wireless channel. 5. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to an exchange of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. A line connection controller for a wireless subscriber system having a line connection controller for controlling connection of the subscriber line. A plurality of reserved radio channels to be used for a call are provided, and in a case where the radio channel is in a congested state, one of the plurality of reserved radio channels is used when a call request is newly issued from a subscriber. Assigning the call to the call, continuing the call if the call is an emergency call, and assigning a radio channel assigned to a non-emergency call that is a call that does not require urgency among calls currently in communication. Control to cut, the line connection control unit of the wireless subscriber system, characterized in that to release the lost radio channel. 6. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to an exchange of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. And a line connection control device for a wireless subscriber system having a line connection control device for controlling connection of the subscriber line, wherein a telephone number of a specific destination requiring urgency and an emergency call which is an urgent call are used. A plurality of reserved radio channels to be registered are registered in advance, and when the radio channel is in a congested state, one of the plurality of reserved radio channels is transmitted when a call request is newly issued from a subscriber. The call is assigned to the call, and the call is determined based on whether the telephone number dialed based on the call request matches the telephone number of the registered specific destination requiring urgency. It is determined whether or not the call is an emergency call. If the call is an emergency call, the call is continued, and the radio channel assigned to the non-emergency call, which is a call that does not require an emergency among the current calls, is forcibly performed. A line connection control device for a wireless subscriber system, characterized in that the line connection is disconnected and the disconnected wireless channel is released. 7. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to an exchange of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. And a line connection control device for controlling the connection of the subscriber line, comprising: a subscriber for extracting subscriber identification information from a call request message received from the subscriber wireless device. The identification information extraction means, the telephone number of a specific destination requiring urgency, the number of reserved radio channels used for an emergency call which is an urgent call, and the total number of radio channels that can be set by the wireless subscriber system are registered in advance. Storage means for storing the number of currently used wireless channels; and the number of reserved channels, the total number of wireless channels, and the number of currently stored wireless channels stored in the storage means. It is determined whether or not the radio channel is in a congestion state based on each data of the number of radio channels in use, and when the radio channel is in a congestion state, when a call request is made, the call origination is performed. Determining means for determining whether or not the outgoing call is an emergency call by determining whether or not the telephone number dialed based on the call request matches the registered telephone number of the specific destination requiring urgency When the determination unit determines that the outgoing call is an emergency call, the call is continued, and a radio channel assigned to a non-emergency call that is a call that does not require urgency among calls that are currently in progress. And a wireless channel connection control means for releasing the disconnected wireless channel. 8. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to an exchange of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. And a line connection control device for controlling the connection of the subscriber line, wherein the line connection control device extracts subscriber identification information from a call request message received from the subscriber wireless device. The identification information extraction means, the telephone number of a specific destination requiring urgency, the number of reserved radio channels used for an emergency call which is an urgent call, and the total number of radio channels that can be set by the wireless subscriber system are registered in advance. First storage means for storing the number of wireless channels currently in use; subscriber identification information extracted by the subscriber identification information extraction means; Second storage means for storing a call duration of a call during a call in association with user identification information; and the number of reserved channels, the total number of radio channels, and the radio currently in use stored by the first storage means. Determine whether the wireless channel is in a congested state based on each data of the number of channels, when the wireless channel is in a congested state, when there is a call request, the call request It is determined whether or not the outgoing call is an emergency call based on whether or not the dialed telephone number matches the telephone number of a specific urgent destination registered in the first storage means. Determining means, when the outgoing call is determined to be an emergency call by the determining means, while continuing the call, referring to the storage contents of the second storage means, the emergency during the current call Calls that are not needed Wireless channel connection control means for forcibly disconnecting a wireless channel allocated to a call having the longest talk time among emergency calls and releasing the disconnected wireless channel. Line connection control device. 9. A subscriber wireless device installed in a subscriber's home and connected to a telephone set, and a wireless channel connected to a switch of a public switched telephone network via a subscriber line and set between the subscriber wireless device and the subscriber's wireless device. A line connection controller for a wireless subscriber system having a line connection controller for controlling connection of the subscriber line. A plurality of reserved radio channels to be used for a call are provided, and in a case where the radio channel is in a congested state, one of the plurality of reserved radio channels is used when a call request is newly issued from a subscriber. Assigning the call to the call, continuing the call if the call is an emergency call, and assigning a radio channel assigned to a non-emergency call that is a call that does not require urgency among calls currently in communication. Readable by a computer recording a program to be executed by a computer for realizing the function of the line connection control device of the wireless subscriber system, characterized in that the computer disconnects the wireless channel and releases the disconnected wireless channel. Recording medium.