JPH0234045A - Subscriber line concentration communication system - Google Patents

Abstract

PURPOSE:To attain proper processing without giving useless retrial and giving-up of a call to a subscriber of a general subscriber telephone network making a call when no idle talking channel exists. CONSTITUTION:When a base station 10 is called via a subscriber line #1 from a subscriber of a general subscriber telephone network 1, it is informed to a main control section 70, the section 70 checks the operating state of talking channels and informs it as the absence of an idle channel when all channels are busy. Then one of the following operations is applied. At first a caller telephone number and a subscriber number of an opposite slave station are acquired from the calling subscriber and when an idle talking channel takes place, both are connected. Second, the telephone number of the calling subscriber is acquired at first and when any idle channel takes place, the subscriber number of the opposite slave station is obtained to connect both. Third, the calling subscriber acquires the subscriber number and the message of the slave station and when an idle channel takes place, the message is transmitted to the slave station. Thus, the caller subscriber can make proper processing without useless retrial or giving-up of a call.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention connects a general subscriber telephone network and a base station via a plurality of subscriber lines assigned representative numbers. Multiple slave stations are connected via a concentrated transmission line such as wireless,
This invention relates to a large volume concentrator communication system that connects incoming calls from a general subscriber telephone network to a slave station using a second dial method.

(Prior art) Accommodates mobile communication terminals such as car phones and terminal devices that are difficult to receive regular public telephone service due to topographical or economical reasons, and makes calls to the general subscriber telephone network economical. As a means of realizing this, a slave station including a mobile communication terminal device such as a car phone is connected to a base station via a concentrating transmission line such as a wireless one, and this base station is connected to the general subscriber telephone network with a representative number. A subscriber concentrator communication system is used that connects via a plurality of subscriber lines provided.

In this type of communication system, an incoming call from the general subscriber telephone network to a slave station is transmitted from the general subscriber telephone network switchboard to the base station via any one of multiple subscriber lines in the form of a ringing signal. The base station detects this paging signal, and if there is an empty communication channel on the transmission path between the base station and the slave station, the paging signal is answered (equivalent to off-hook of a telephone).
The voice, tone, etc. is sent to the calling subscriber of the general subscriber telephone network via the subscriber line to prompt the subscriber to send the slave subscriber number (second dial number), and this voice, tone, etc. An incoming call is made to the slave station using the second dial number sent according to the above procedure, and the incoming call is connected by allocating the vacant communication channel.

(Problem to be Solved by the Invention) However, if there is an incoming call to a slave station when there is no available communication channel, the base station cannot allocate the communication channel, but in this case, the base station cannot allocate the communication channel. The problem is how to deal with people. That is, it is contrary to the fact that the base station issues a "busy" notification to the calling subscriber, for example, and that providing any kind of response when no actual call is taking place may result in paying the subcommittee. Therefore, in the past, the base station responded to an incoming call when the communication channel was free, and did not respond to an incoming call when there was no free communication channel. I try not to.

However, this method forces the calling subscriber to make unnecessary retries or abandons the call, resulting in degraded service, and therefore improvements are desired.

The present invention has been developed in view of the above-mentioned conventional problems, and its purpose is to prevent unnecessary retries and calls to subscribers of the general subscriber telephone network who made a call when there was no available communication channel. It is an object of the present invention to provide a communication system for concentrating subscriber lines in which appropriate measures can be taken without causing subscribers to give up.

(Means for Solving the Problems) In order to achieve the above object, the subscriber line concentration communication system of the present invention has the following configuration.

That is, the subscriber line concentration communication system of the present invention includes a base station connected to a general subscriber telephone network via a plurality of subscriber lines assigned representative numbers, and a base station connected to the base station via a line concentration transmission line. In a subscriber concentrating communication system, the base station comprises a plurality of slave stations, and makes incoming calls from the general subscriber telephone network to the slave stations by a second dial method;
means for notifying a calling subscriber of the general subscriber telephone network that the transmission line is blocked in response to an incoming call from the general subscriber telephone network to the slave station that occurs while the concentrator transmission line is blocked; prompting a person to send the calling subscriber's telephone number and the subscriber number of the destination slave station; a telephone number of the calling subscriber sent from the calling subscriber and a subscription of the called slave station; means for storing either a subscriber number, a telephone number of the calling subscriber, or a subscriber number of the called party's first slave station and a message to the called party's first slave station; In response to the occurrence, the storage means is accessed, and both the calling subscriber and the destination slave station are called and connected, or the calling subscriber is called and the subscriber number of the destination slave station is called. and a means for either calling the destination slave station and establishing a connection between the two, or calling the destination slave station and transmitting the message from the calling subscriber; It is characterized by the presence of

(Function) Next, the function of the subscriber line concentration communication system of the present invention configured as described above will be explained.

When a call arrives from the general subscriber telephone network while the concentrator transmission line is blocked, the base station notifies the calling subscriber that the transmission line is blocked, and performs one of the following three actions:
The first method is to obtain the telephone number of the calling subscriber and the subscriber number of the slave station of the other party from the calling subscriber, and to establish a connection between the two parties when a free channel becomes available. First, the telephone number is obtained from the subscriber, and when a call channel becomes available, the calling subscriber is called, the subscriber number of the other party's slave station is obtained, and the connection between the two is established.Thirdly, the calling subscriber The system obtains the subscriber number of the other slave station and the message to the slave station from the person, and transmits the message to the slave station when the communication channel becomes vacant.

In this way, the calling subscriber of the general telephone network can achieve his initial goal without unnecessary retries or abandonment of the call.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the overall configuration of a subscriber line concentration system according to an embodiment of the present invention.・・・
, #n) and this base station 10
and a plurality of slave stations (100-1, 100-2, . . . +0O-k) connected via a wireless line that is a concentrator transmission path. Multiple subscriber lines (#1゜#2...,
#n) is assigned one representative number, and each slave station is assigned a second dial number as a subscriber number.

base station! 0 is the subscriber line interface circuit (20-
1 to 2 O-n), a communication path switch 30, a radio interface circuit (40-1 to 401), a radio transmitter/receiver 50, a time memory circuit 60, and a main control section 70. be done.

Subscriber line interface circuit (20-1 to 2O-n)
interfaces the subscriber line from the general subscriber telephone network exchange 1, and inputs/outputs call connection information such as outgoing/incoming calls, call termination, etc. to/from the main control unit 70 via the data bus.

The communication path switch 30 connects subscriber line interface circuits (20-1 to 2O-n) under control from the main control unit 70.
The n signals are switched and connected to m communication channels (m is a positive integer of man) on the transmission path between the base station and the slave station.

The radio interface circuits (40-1 to 40-m) interface with the radio transceiver 50, and input/output call connection information such as call origination and call termination from the slave station to and from the main control unit 70 via the data bus. do.

The temporary storage circuit 60 is provided to implement the present invention, and is controlled by the main control unit 70 via the data bus, and stores the telephone number of the calling subscriber of the general subscriber telephone network and the called slave station. Either the subscriber number (second dial number), the telephone number of the calling subscriber, or the second dial number of the called slave station and the message to the called slave station are stored.

The main control unit 70 manages and controls the entire subscriber concentrating communication system, such as controlling the allocation of communication channels on the wireless transmission path, and also controls the general subscriber telephone network when all communication channels on the wireless transmission path are blocked. The slave station (100-
1 to 100-k) include mobile communication terminal devices such as car telephones, as in the past.

Next, with reference to FIGS. 2 to 4, we will explain the incoming call connection control according to the present invention, that is, incoming calls from the general subscriber telephone network to the slave station that occur when all communication channels of the wireless transmission path are busy. We will explain the connection control procedure for .

In Figure 2, when a subscriber of the -a subscriber telephone network goes off-hook, a dial tone is sent from exchange 1 to the calling subscriber, so the calling subscriber first uses a regular telephone 0 Calls the base station IO by dialing the representative telephone number of the base station IO according to the connection procedure 0 Exchange 1 receives a request for connection to the base station IO from the calling subscriber
selects vacant subscriber line #1 from n subscriber lines #1 to #n assigned the same representative number, sends out a ringing signal, and performs an incoming call to the base station IO.

The base station 10 that receives the call via the subscriber line #1 receives the ringing signal at the subscriber line interface circuit 20-1, and notifies the main controller 70 of the occurrence of the incoming call via the data bus9. Upon receiving the notification, the main control unit 70 checks the usage status of the call channels, and if all call channels are busy, responds according to the busy processing procedure, that is, notifies that there is no free call channel, and calls and joins. The subscriber line interface circuit 20-1 is instructed via the data bus to send out the telephone number of the person and the second dial number of the slave station of the other party. At the same time, the main controller 70 instructs the communication path switch 30 to connect the subscriber line interface circuit 20-1 and the temporary memory circuit 60, and also instructs the time memory circuit 60 to connect the subscriber line interface circuit 20-1 to the temporary memory circuit 60. PB from the calling subscriber, sent via -1
Instructs to wait for the calling subscriber's telephone number and the second dial number of the destination slave station by a signal, and to temporarily store the sent calling subscriber's telephone number and the second dial number of the destination slave station. . As a result, the subscriber line interface circuit 20-1 sends a call response (
After completing the call path setting on the general subscriber telephone network, the calling subscriber is notified that the call channel of the subscriber concentrator communication system is busy, and then the calling subscriber's telephone number and the other party are notified. A request for transmission of the second dial number of the first slave station is made sequentially.This is done by voice signal or tone signal. are stored in the temporary storage circuit 60, respectively. The calling subscriber then goes on-hook following normal procedures. As a result, the subscriber concentrator communication system is separated from the general subscriber telephone network.

On the other hand, the main control unit 7 that manages and controls the communication channel
0, the temporary memory circuit 6 is stored every time the communication channel becomes empty.
0, and if a call waiting signal is stored, select an empty line among subscriber lines #1 to #n, and select the subscriber line corresponding to the empty line, for example, subscriber line #2. The interface circuit 20-2 is controlled to cause the exchange 1 to perform an off-hook operation.

Then, after waiting for reception of the dial tone, the temporary memory circuit 6
0 sends the stored calling subscriber number to the subscriber line interface circuit 20-2 via the communication path switch 30, and sends the calling subscriber number to the subscriber line #2. In other words, the calling subscriber is automatically called. At the same time, the main control unit 70 controls the calling of the called slave station and the assignment of voice channels in accordance with the second dial number of the destination slave station stored in the time storage circuit 60. Instructs the control channel radio interface circuit 4o-1 used for allocation control, etc., and also communicates between the subscriber line interface circuit 20-2 and the allocated communication channel radio interface circuit via the communication path switch 30. perform connection control,
As a result, when the calling subscriber and the called slave station each go off-hook, both parties enter a conversation state.

Next, in FIG. 3, the base station notifies the calling subscriber that there is no available communication channel, and requests transmission of the calling subscriber's telephone number. Go on-hook after sending.

This calling subscriber's telephone number is stored in temporary storage circuit 60. The main control section 70 checks the temporary storage circuit 60 every time a communication channel becomes vacant, and calls the calling subscriber using the same procedure as described above.

When the calling subscriber goes off-hook and answers, the main controller 70
causes the corresponding subscriber line interface circuit to transmit a signal requesting transmission of the second dial number of the called slave station. The corresponding subscriber line interface circuit notifies the main controller 70 of the second dial number sent from the calling subscriber.

In accordance with this second dial number, the main control unit 70 controls the calling of the called substation and the allocation control of communication channels to the control channel radio interface circuit 40-1 used for the control 4 of communication channel allocation of the wireless transmission path. At the same time, it also controls the connection between the corresponding subscriber line interface circuit and the allocated communication channel radio interface circuit via the communication path switch 30.

As a result, a call is established between the calling subscriber and the slave station.

Finally, in FIG. 4, the base station notifies the caller that "no communication channels are available" in response to the loud ringing tone, and
Request the second dial number of the first slave station to be called and the transmission of a message to the first slave station to be called 9 The calling subscriber goes on-hook after responding to this request 0 The second dial number of the first slave station to be called and its The message is stored in temporary storage circuit 60.

Then, when the communication channel becomes vacant, the main control unit 70 confirms that the transmission message is stored in the -time storage circuit 60, calls the corresponding slave station according to the second dial number stored therein, and When the corresponding slave station responds by going off-hook, it transmits the message via the free communication channel. The corresponding slave station goes on-hook after receiving the message.

<Effects of the Invention> As detailed above, according to the subscriber concentrating communication system of the present invention, when the transmission line between the base station and the slave station is blocked, a communication from a subscriber of the general subscriber telephone network to the slave station occurs. In response to an incoming call, the highland station responds and notifies the calling subscriber that the concentrator transmission line is closed, and also sends the telephone number of the calling subscriber and the second dial number of the destination slave station. This system allows messages to be sent and messages to the destination slave station and is stored in memory, so that automatic call connection or message transmission can be performed when a call channel becomes available. The subscriber can achieve the initial objective without making unnecessary retries or giving up on calling, and this has the effect of improving the service.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of a subscriber concentrator communication system according to an embodiment of the present invention, and FIGS. 3 is a flowchart illustrating an example of a connection control procedure for an incoming call to a slave station. 1... General subscriber telephone network switch, 10...
...Base station of subscriber concentration communication system, 20-1 to 2
0-1...Subscriber line interface circuit, 3
0...Call path switch, 40-1 to 401.
...Radio interface circuit, 50...
. . . Wireless transceiver, 60 . . . -Time memory circuit, 70 . . . Main control unit, 100-1 to 100
-k...Slave station of subscriber concentrator communication system. General Tsu D Inmei Den Kosudai embedded Patent Attorney Hachimanyoshi Hironori 2 Figures General ffIII, Jl Tsumugi Junsa Mi Visit Δ- (Dimensions 3 Lord Arrogance (3) Graduation 4 Figures

Claims (1)

[Claims] A base station connected to a general subscriber telephone network via a plurality of subscriber lines assigned representative numbers, and a plurality of slave stations connected to the base station via a concentrator transmission line, In a subscriber concentrator communication system in which incoming calls from a telephone network to the slave station are made using a second dial method; In response to an incoming call, means for notifying the calling subscriber of the general subscriber telephone network that the transmission path is blocked; Means for prompting transmission, prompting transmission of the calling subscriber's telephone number, or prompting transmission of the subscriber number of the destination slave station and a message to the destination slave station. and; the telephone number of the calling subscriber and the subscriber number of the destination slave station sent from the calling subscriber, or the telephone number of the calling subscriber, or the subscription of the destination slave station; means for storing either the calling subscriber's number or a message to the destination slave station; accessing the storage means when the concentrating transmission line becomes vacant; To call both stations and connect them, or to call the calling subscriber and send out the subscriber number of the destination slave station, thereby calling the destination slave station and connecting the two; 1. A subscriber concentrating communication system, comprising: means for either calling a previous slave station or transmitting a message from a calling subscriber;