JPS5992636A - Radio telephone exchange system sharing subscriber circuit - Google Patents

Abstract

PURPOSE:To increase the efficiency of a subscriber circuit and to reduce the cost by making the number of subscriber circuits less than that of subscriber lines, and connecting the subscriber circuits to the subscriber lines successively in predetermined order by utilizing channel switches, and detection incoming. CONSTITUTION:A common subscriber circuit LC is provided on the side opposite to subscriber lines Li with channel switches SW between. An LC connection control circuit LSCN normally sends out the indication of predetermined-order successive connections between the subscriber circuit LC and subscriber lines Li of a host station to a common control circuit CONT, which makes connections in the channel switches SW successively according to the indication to perform incoming detection periodically. The circuit LC once detecting an incoming call sends an incoming display signal to the circuit LSCN. The circuit LSCN stops are successive connection indication to the circuit CONT and sends the number of a subscriber line where the incoming call arrives from its own memory to the circuit CONT. The circuit CONT selects a free radio circuit among radio circuits and connects the free radio circuit Tm to the subscriber line through the switch SW.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless telephone switching system that provides switching connections between a plurality of subscriber lines from an upper station and a plurality of radio lines.

Conventionally, a wireless telephone switching system was configured by installing subscriber circuits in the same number as subscriber lines in a wireless telephone exchange connected to an upper station through subscriber lines, and control was performed based on this configuration.

In the control of the above system, the number of circuits actually used for telephone calls out of a group of subscriber circuits provided by the number of subscribers does not exceed the maximum number of simultaneous connections of the system, and the number of circuits that are actually used for telephone calls does not exceed the maximum number of simultaneous connections. The actual situation was that the functions of the subscriber circuits were in a dormant state. Therefore, there was a drawback that the usage efficiency of the subscriber circuit was extremely poor.

FIG. 1 is a diagram showing the configuration of a wireless telephone switching system according to the prior art. A subscriber circuit is connected to each of the n subscriber lines, and these subscriber circuits are connected to m radio lines through a communication path switch SW.

Trunk channels 1 to Tn, subscriber circuits LC1 to LCn, and communication path switches SW inserted in each radio line are connected to a common control circuit C0NT. One busy tone transmitter BTO8Cfl is connected to all subscriber circuits LC1 to LCn. In this wireless telephone exchange, multiple subscribers share the wireless line, so n>m.
Therefore, the maximum number of simultaneous connections is 1 dm.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless telephone switching system that utilizes subscriber circuits efficiently.

In order to achieve the above object, the present invention provides a wireless telephone switching system that shares subscriber circuits. A number of subscriber circuits smaller than the number of lines are provided, and the subscriber circuits are sequentially connected to the plurality of subscriber lines in a predetermined order by using a call path switch provided as an original function of the wireless telephone exchange. When the subscriber circuit detects an incoming call, the common control circuit is provided with a control means for notifying the common control circuit of the subscriber line on which the incoming call is received.

According to the above configuration, the usage efficiency of the subscriber circuit is improved, and the object of the present invention is fully achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the wireless telephone switching system @1 according to the present invention. This system removes all the subscriber circuits LCI to LCn from the prior art configuration shown in FIG. It is housed on the opposite side. Of the basic functions of the subscriber circuit, the busy tone sending function is separated from the subscriber circuit LC, and the function is realized by a busy tone sending trunk BTT. That is, a busy tone transmission trunk is connected to the busy tone transmitter BTO8C, and the subscriber lines L1 to 1 are connected through the communication path SW.
This is configured to send a busy tone to Ln. An LC connection control circuit SCN is provided between the subscriber circuit LC and the common control circuit C0NT. The LC connection control circuit SCN sequentially connects the subscriber circuit LC to the subscriber lines L1 to Ln.
Controls connection to.

In general, the subscriber circuit of a wireless telephone exchange that interfaces with the upper station through a subscriber line connection is designed to provide 0 call paths, ■ incoming call detection function (mainly ringing detection function), ■ busy tone transmission function, and ■ ring trifle 1 function. However, in this embodiment, these functions are integrated into a common subscriber circuit LC and busy tone transmission trunk.

The incoming call connection, outgoing call connection, and busy tone transmission operations in this embodiment are as follows.

First, I will explain the incoming call connection.

LC connection control 11 paths LSCN [always, common control circuit C0
A common subscriber circuit L with a defined priority for the NT.
It issues an instruction to connect the subscriber lines of C and the upper station one after another, and the common control circuit C
Connections 8W1.8W2~ indicated by dotted lines in the communication path SW in the figure
8Wn is executed sequentially to periodically detect incoming calls. In the process of sequentially connecting the subscriber circuit LC and the subscriber lines L1 to Ln via the communication path, when there is an incoming call, the subscriber circuit L
C detects this. Normally, an incoming call is made by detecting a ringing signal sent from an upper station.

When the subscriber circuit LC finishes incoming call detection, the subscriber circuit LCi
j Display an incoming call display on LC connection control circuit 8CH. This incoming call display instructs the LC connection control circuit SCNa common control circuit C0NT to stop the operation that has been proceeding until now, that is, the operation of sequentially connecting the subscriber circuits LC to subscriber lines L1 to LnK, and also controls the LC connection. circuit 8CN
It sends the numbers of the subscriber lines L1 to Ln that have received incoming calls, which it has stored, to the common control circuit.

Common control circuit C0NT Fi Based on the above instructions and information, the wireless lines T1 to T
Select an empty line among m and select the subscriber line where the call was received (Ll~
(one line of Ln) and closes the communication path SW.

This figure shows a case where a call arrives at the subscriber line L2, and shows an example in which the call is connected to a wireless line Tm that is determined to be empty at that time.

In this way, when processing is completed for one incoming call, L
C connection control circuit 8CNt! In order to detect another incoming call again, an instruction is issued to the common control circuit C0NT to sequentially connect the subscriber circuit LC and the subscriber lines L1 to Ln.

Next, the outgoing connection will be explained. A call from a wireless terminal is detected by the common control circuit C0NT.

When the common control circuit C0NT detects a call, it connects the subscriber circuit LC and the subscriber lines Tj1 to Tj1 as shown in the operation explanation of the incoming call above.
After sequentially stopping the connection operation between Ln and receiving the information necessary to connect the call using the conventional technology, immediately connect the radio line (one of Tl to Tn) on which the call was detected and the radio terminal that made the call. and the corresponding subscriber line (one line among L1 to Ln).

In this figure, #1 subscriber (#l5UB) via wireless line T2
This shows a case where a call is detected from wireless lines T2 and #1.
An example is shown in which a subscriber line L1 corresponding to a subscriber ($I SUB ) is closed by a communication path SW.

Next, the connection operation when transmitting the busy tone will be explained.

After an incoming call is detected, if the connection cannot be established for some reason, such as when the wireless line is in conversation or the wireless terminal is powered off, a busy tone is sent to the caller and the call cannot be connected. It is necessary to notify that In such a case, the common control circuit C0NT connects the subscriber line (one of L1 to Ln) on which the call has arrived and the busy tone transmission trunk BTT via the communication path SW.

Through this connection, the output of the busy tone oscillator BT-08C is transmitted to the calling subscriber. At this time, the necessary ring trip is also performed inside the trunk BTT.

FIG. 3 is a diagram showing a second embodiment of the present invention.

The embodiment shown in FIG. 2 shows an example in which one common subscriber circuit LC and one busy tone transmission trunk BTT are provided, but in this embodiment, the common subscriber circuit LC and busy tone transmission trunk BTT are provided in common. This shows an example in which two trunk BTTs are each provided.

This embodiment solves the disadvantage incidental to the present invention, namely, the incoming call detection operation time, that is, the subscriber circuit LC and the subscriber line L.
This is to alleviate the disadvantage that the operating time for sequentially connecting 1 to Ln increases in proportion to the increase in the number of subscribers, resulting in a longer connection time. For subscriber lines L1 to Lx, an incoming call is detected in subscriber circuit LC-A, and subscriber line Lx
Incoming call detection is performed in the ±1 to LnFi subscriber circuit LC-B.

LC connection control circuits SCN-A, B are provided corresponding to subscriber circuits LC-A, B, and subscriber lines L1 to Lx and L
Since the subscriber groups divided into two groups x-1-1 to Ln are detected at independent intervals, the time required to detect an incoming call is halved.

In the present invention, the number of commonly used subscriber circuits LC and busy tone transmission trunks BTT may be three or more depending on the traffic, which can be easily inferred from the above explanation.

As the present invention has been described in detail above, the common provision of subscriber circuits increases the efficiency of the subscriber circuits and provides significant cost savings. Furthermore, the present invention can significantly reduce the number of subscriber circuits, thereby reducing the mounting space of the entire system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional wireless telephone switching system.
FIG. 2 is a diagram showing a first embodiment of a wireless telephone switching system sharing subscriber circuits according to the present invention, and FIG. 3 is a diagram showing a second embodiment of the present invention. LCI to LCn...Subscriber circuit SW...Call path switch T1 to Tn...Trunk C0NT...Common control circuit L1 to Ln...Subscriber line BT-08C...Busy tone transmitter BTT...Busy tone transmission trunk #1, #2 SUB...Radio terminal LC...Subscriber circuit LSCN, LSCN-A, LSCN-B...LCC connection control circuit Wl, 2. n...Closed state of communication path switch Patent applicant Hisashi Inoro, agent for NEC Corporation, patent attorney

Claims (1)

[Claims] In a wireless telephone switching system that is connected to an upper station by multiple subscriber lines, a number of subscriber circuits smaller than the number of subscriber lines are provided for the plurality of subscriber lines as an original function of the wireless telephone exchange. Instructs the common control circuit to sequentially connect the subscriber circuit to the plurality of subscriber lines in a predetermined order using a call path switch installed in the subscriber circuit, and the subscriber circuit detects an incoming call. A wireless telephone exchange system sharing a subscriber circuit, characterized in that a control means is provided for notifying the common control circuit of the subscriber line on which the call has arrived.