JP3064096B2 - Ring signal control method for cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a call signal of a cordless telephone transmitted from a private branch exchange to a base unit of the cordless telephone, and more particularly to a cordless telephone capable of reliably connecting via a wireless line. The present invention relates to a telephone signal control method .

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a connection relationship between a cordless telephone and a private branch exchange. As shown in FIG. 2, the cordless telephone includes a master unit 3 and a slave unit 5,
Base unit 3 is directly connected to private branch exchange 1 that controls the line connection by telephone subscriber line 2, and handset 5 is connected to base unit 3 by forming wireless line 4 with base unit 3. The connection is realized. The user is the parent device 3 and the child device 5
In both cases, outgoing and incoming calls can be made.

[0003] A processing method at the time of outgoing and incoming calls in the cordless telephone having the above configuration will be described with reference to FIG. When making a call from the handset 5, the wireless line 4 is formed between the handset 5 and the base unit 3 by pressing the hook button of the handset 5,
The connection with the master unit 3 is completed. Base unit 3 is telephone subscriber line 2
And transmits the signal to the private branch exchange 1.

In the case of an incoming call, the private branch exchange 1 sends a ringing signal (ringer signal) to the base unit 3 via the telephone subscriber line 2, and the base unit 3 receives the calling signal, and The wireless line 4 is formed between the mobile phones, and the slave unit 5 rings the incoming call bell.

A conventional method for controlling a call signal from the private branch exchange 1 to the base unit 3 at the time of an incoming call will be described with reference to FIG. FIG. 3 is a timing chart showing the signal transmission timing of the call signal control method of the conventional cordless telephone.

In the conventional paging signal control method, for example, if the ON time of the paging signal is a and the OFF time is b, as shown in FIG. 3, it turns on for a time and then turns off for b time. ON, O every fixed time
A signal control method that repeats FF has been common.

[0007] When the connection via the wireless line 4 between the master unit 3 and the slave unit 5 fails when receiving a call from the private branch exchange 1 as described above, the master unit 3 calls from the telephone subscriber line 2. It waits until the signal stops. In other words, when the call signal sent from private branch exchange 1 via telephone subscriber line 2 stops, base station 3 is again ready to receive the call signal. Therefore, unless the call signal of the connection failure from the private branch exchange 1 is stopped, the master unit 3 cannot cancel the standby state.

[0008]

However, in the above-described conventional call signal control method, the connection of the wireless line 4 between the master unit 3 and the slave unit 5 at the time of an incoming call fails, and the master unit 3 enters a standby state. In this case, the caller only hears the ringback tone from the telephone subscriber line 2 and cannot determine whether the other party is absent or the connection via the wireless line 4 has failed, which is inconvenient. Unless the user once hangs up the telephone and makes a call again, the connection on the wireless line 4 cannot be tried again, so that there is a problem that the connection on the wireless line 4 cannot be easily made.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of controlling a call signal of a cordless telephone capable of reliably connecting a radio line at the time of an incoming call.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a base unit and a slave unit connected by a radio line, and a private branch exchange for sending a call signal to the base unit when an incoming call is received. In the call signal control method of a cordless telephone that attempts to establish a wireless line connection with the slave unit when the master unit receives the call signal, a wireless line connection between the master unit and the slave unit The private branch exchange sends the call signal for a time longer than the required time, and the private branch exchange stops transmitting the call signal for a time longer than the time required for the master unit to determine that the call signal has stopped. The transmission and stop of the call signal are repeatedly performed.

[0011]

According to the present invention, the private branch exchange sends out a calling signal in a time longer than the time required for the wireless line connection between the master unit and the slave unit, and the master unit determines that the calling signal has stopped. The private branch exchange stops sending the call signal in a time longer than the required time, and the call signal control method for a cordless telephone that repeatedly sends and stops the call signal is used. If the call fails, the master unit determines that the calling signal has stopped during the subsequent suspension period, cancels the standby state, and can try to connect the wireless line again in the next transmission period, and the wireless line is connected. By repeatedly performing the same processing until the connection is established, the connection of the wireless line can be reliably performed.

[0012]

An embodiment of the present invention will be described with reference to the drawings. The relationship between the cordless telephone and the private branch exchange according to one embodiment of the present invention is the same as that of the conventional example shown in FIG.
A telephone subscriber line 2; a base unit 3 of the cordless telephone directly connected to the private branch exchange 1 by the telephone subscriber line 2; and a slave unit 5 connected by forming a wireless line 4 between the base unit 3 and the base unit 3. It is composed of

Next, a call signal control method for the cordless telephone according to the present embodiment will be described. When an incoming call is received by the cordless telephone having the above configuration, a call signal is transmitted from the private branch exchange 1 to the base unit 3 via the telephone subscriber line 2 as in the conventional example. A wireless line 4 is formed between the terminal 5 and the terminal 5 so that the incoming call bell rings at the child device 5.

A feature of the present embodiment is that, when a call is received from the private branch exchange 1, a signal transmission time required for the base unit 3 to form the radio line 4 with the slave unit 5 is T1. The private branch exchange 1 sends a calling signal to the base unit 3 for a time longer than T1. The base unit 3 receives the calling signal and attempts to connect the wireless line 4 to the slave unit 5 to succeed in connection or Will fail.

If the connection of the radio line 4 fails, the base unit 3 enters a standby state, and if a period of time longer than T1 elapses, the base unit 3 receives a call signal from the private branch exchange 1 for a period of time T2 or longer when the base unit 3 determines that the call signal is stopped. Stop for hours.

After a lapse of time T2 or more, the master unit 3
Determines that the calling signal from the private branch exchange 1 has stopped, the master unit 3 is again ready to receive the calling signal from the private branch exchange 1, and the master unit 3 returns to the calling signal from the private branch exchange 1 at the next time T1. Is received, master unit 3
Is in a state of trying to connect the wireless line 4 again.

FIG. 1 is a timing chart showing the transmission timing of a call signal according to this embodiment. The paging signal control method according to the present embodiment is represented by a transmission period A in which ON and OFF alternately appear, with a paging signal ON time being a and an OFF time b, and a suspension period B in which no paging signal is transmitted. Then, as shown in FIG. 1, the transmission period A and the stop period B appear alternately.

In the transmission period A, the ON / OFF of the call signal is repeated such that the transmission of the signal is stopped only for the time b when the call signal is turned ON for the time a. And the base unit 3 is a wireless line 4
Is longer than the signal transmission time T1 required for connection.

Then, the stop period B appears after the transmission period A, and the transmission of the signal is stopped only for the time t2. Suspension period B
The time t2 is longer than the signal suspension time T2 required for the base unit 3 to determine that the calling signal from the private branch exchange 1 has stopped. Then, the transmission period A and the suspension period B
Are alternately repeated.

An incoming call state of a cordless telephone according to the call signal control method of the embodiment will be described. When a call signal is transmitted from the private branch exchange 1 to the base unit 3, the base unit 3 attempts to form a wireless line 4 with the slave unit 5 during the first transmission period A. Transmission period A is T
Since the time is 1 or more, it is a time sufficient to form the wireless line 4. Here, when the formation of the wireless line 4 is successful, the master unit 3 rings the incoming call bell of the slave unit 5.

If the formation of the radio line 4 fails in the first transmission period A, the base unit 3 enters a standby state until the calling signal from the private branch exchange 1 stops. However, during the next stop period B, the base station 3 determines that the call signal has stopped because the signal stops for the time period T2 or longer, and is ready to newly receive the call signal from the private branch exchange 1. And
In the second transmission period A, the base unit 3 receives the call signal from the private branch exchange 1 and tries to connect the wireless line 4 with the slave unit 5 again.

Therefore, even when the base unit 3 fails to form the radio line 4, a stop period B of the call signal from the private branch exchange 1 appears each time, and the base unit 3 determines that the call signal has stopped. The standby state is released, and the next transmission period A allows the user to try to form the wireless line 4 again, and the same processing is repeated until the wireless line 4 is formed. The wireless line 4 can be reliably connected.

According to the cordless telephone calling signal control system of the present embodiment, the base unit 3 has a transmission time t1 which is longer than the signal transmission time T1 required for forming the wireless line 4 with the slave unit 5. A transmission period A and a suspension period B having a suspension time t2 longer than a signal suspension time T2 necessary for the base unit 3 to determine that the calling signal from the private branch exchange has stopped.
, The paging signal is controlled so that the paging signal alternately appears. Therefore, even if the formation of the radio line 4 fails during the paging signal transmission period A, the base unit 3 immediately stops the paging signal during the suspension period B. Is determined to have stopped, the standby state is released, and the connection of the wireless line 4 can be tried again in the next transmission period A, and the same processing is repeated until the wireless line 4 is formed. Has the effect that the wireless line 4 can be reliably connected without having to make a call again.

[0024]

According to the present invention, the private branch exchange sends out a calling signal in a time longer than the time required for the wireless line connection between the master unit and the slave unit, and the master unit determines that the calling signal has stopped. In this case, the private branch exchange stops sending the call signal for a time longer than the time required for the call, and the call signal control method for the cordless telephone in which the call signal is repeatedly sent and stopped, is used. If the connection to the wireless line fails during this period, the base unit may determine that the calling signal has stopped during the subsequent suspension period, release the standby state, and attempt to connect the wireless line again during the next transmission period. By performing the same processing repeatedly until the wireless line is connected, the wireless line can be reliably connected.

[Brief description of the drawings]

FIG. 1 is a timing chart showing a signal transmission timing of a calling signal control method of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a connection relationship between a cordless telephone and a private branch exchange.

FIG. 3 is a timing chart showing a signal transmission timing of a call signal control system of a conventional cordless telephone.

[Explanation of symbols]

1. Private branch exchange 2. Telephone subscriber line 3. Cordless telephone base unit 4. Wireless line 5. Cordless telephone slave unit

────────────────────────────────────────────────── (5) References JP-A-3-40636 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/24-7/26 H04Q 7 / 00-7/38 H04Q 3/58-3/62 H04M 1/00-1/78

Claims (1)

(57) [Claims] 1. A base station and a slave unit connected by a wireless line, and a private branch exchange for sending a calling signal to the master unit when an incoming call is received. In the control method of a cordless telephone that attempts to establish a wireless line connection, the private branch exchange sends the calling signal for a time equal to or longer than the time required for wireless line connection between the master unit and the slave unit, and the master unit transmits the call signal. The cordless telephone according to claim 1, wherein the private branch exchange stops sending the call signal for a time equal to or longer than the time required to determine that the call signal has stopped, and repeats sending and stopping the call signal. Call signal control method .