JPH06224833A - Call control system for cordless telephone system - Google Patents

Abstract

PURPOSE:To attain the calls in a conference call system by using simultaneously plural portable telephone sets only in a group that is previously registered. CONSTITUTION:The portable telephone set 18-20 and 26-28 are divided into plural groups and each of these telephones transmits the group identification signal to identify its own group. A controller 22 judges whether these transmitted group identification signals are belonging to the same group or not. Then the portable telephone sets can be simultaneously used only in the same group and the talking is possible in a conference call system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call control system for a cordless telephone, which is capable of making a conference call by simultaneously using a plurality of cordless mobile telephones.

[0002]

2. Description of the Related Art First, a general cordless portable telephone will be described with reference to FIGS.

The mobile phone 1 comprises a radio 2, a microphone 3 connected to the radio 2, a speaker 4, a CPU 5, and a ROM 6 connected to the CPU 5.

The base unit 7 includes a radio 9 connected to the telephone line 8, a CPU 10 connected to the radio 9, and a ROM 11 connected to the CPU 10.

In order for the mobile phone 1 to make a call, the CPU 5 first reads the system ID for identifying the own system from the ROM 6 and sends a radio line connection request command to the base unit 7.

The command transmitted at this time is, as shown in FIG. 4, a preamble 12, a system ID 13,
And a control command 14. In the base device 7 which receives this command, the CPU 10 reads the system ID from the ROM 11 and receives the system ID of the command.
Match with. If the result of the collation is the same, it is recognized as the mobile phone of the own system and the process of connecting the call line is started. If the system ID is different as a result of the collation, a call cannot be made because the wireless line is not connected.

Based on the above description, a current actual system will be described with reference to FIG.

First, in FIG. 5, the base devices 15, 16 and 1
7 and the mobile phones 18, 19 and 20 are in the same group, so that the same system ID is registered. Therefore, in order to form a communication path, the mobile phones 18, 19 and 20 may go to the vicinity of the base device 15 or the base device 16 or the base device 17 to be connected and send a wireless line connection request command. In FIG. 5, the wireless lines of the base device 15 and the mobile phone 18 are connected, the wireless lines of the base device 16 and the mobile phone 19 are connected, and the base device 17 and the mobile phone 20 are connected. Further, in FIG. 5, the base device 15, the base device 16, and the base device 17 are connected by a telephone line 21. For this reason, the mobile phones 18, 19 and 20 are connected through the call line 21, so that a conference call can be performed by all the mobile phones. The control device 22 controls the base devices 15, 16 and 17.

[0009]

As described above, in the conventional system, the conference call has one circuit, and the group call cannot be made in one system. For example, divide the call line into 2
A line is not enough to represent a two-circuit conference call within one system. This will be described with reference to FIG. Base devices 15, 16, 17 and mobile phones 18, 1
One group consisting of 9 and 20, base units 23, 24 and 25
And the mobile phones 26, 27, and 28 are one group. The base devices 23, 24, 25 are connected by a telephone line 21. At this time, since the system IDs are the same, when the mobile phone 18 sends a wireless line connection request command to the base device 23, the base device 23 determines that the system I
Since D is the same, a wireless line is formed. This violates the concept of a group because the call is made to a different group. In other words, it is not possible to realize just by dividing the communication path, and control must be separated.

An object of the present invention is to provide a call control system for a cordless telephone capable of making a conference call by simultaneously using a plurality of mobile telephones only in a group registered in advance.

[0011]

According to the present invention, in a call control system for a cordless telephone capable of making a conference call by simultaneously using a plurality of cordless portable telephones, the portable telephones belong to a group. A group identification signal for identifying the conference, and it is judged whether or not these group identification signals belong to the same group. A call control system for a cordless telephone, which is characterized in that a call can be made in a call system, is obtained.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 shows mobile phones 18, 19, 20, and 2.
6 is a diagram for explaining a wireless line connection request command C held by 6, 27, and 28. FIG. This wireless line connection request command C includes a preamble 12 and a system ID 13
And a control command 14 and a group ID 29 which is a signal for identifying the group.

Base units 15, 16, 17 and mobile phone 1
The base device 2 comprises a group of 8, 19, and 20.
It is preset that 3, 24, 25 and the mobile phones 26, 27, 28 form one group. Since the respective groups are connected by the call lines 21 and 30, the mobile phones 18, 19 and 20 can talk by the conference call method via the call line 21, and the mobile phones 26, 27 and 28 can A call can be made by the conference call system by the call line 30. The control device 22 determines whether or not they belong to the same group based on the group ID 29 of the wireless line connection request command C from the mobile phones 18 to 20 and 26 to 28, and determines that they belong to the same group. Only in this case, the call lines 21 and 30 are connected. Therefore, when one call system is used by a plurality of companies, it is possible to preset a plurality of groups capable of making a conference call and to make a conference call only within the same group. Contents will not be transmitted to mobile phones of other groups.

[0015]

According to the present invention, it is possible to use a plurality of mobile phones at the same time only within a group registered in advance to make a conference call.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining a wireless line connection request command transmitted by a mobile phone according to an embodiment of the present invention.

FIG. 3 is a block diagram showing an example of a conventional call control system for a cordless telephone.

FIG. 4 is a diagram for explaining a wireless line connection request command transmitted from a mobile phone in the call control system for the cordless phone of FIG.

FIG. 5 is a block diagram showing another example of a conventional call control system for a cordless telephone.

[Explanation of symbols]

1, 18, 19, 20, 20, 26, 27, 28 Mobile phone 7, 15, 16, 17, 23, 24, 25 Base device 22 Control device 29 Group ID

Claims (1)

[Claims] 1. A cordless telephone call control system capable of making a conference call by simultaneously using a plurality of cordless mobile phones, wherein the mobile phones are divided into a plurality of groups in advance, and the mobile phones belong to the group. Send a group identification signal to identify the group,
In addition, it is determined whether or not these group identification signals belong to the same group, and it is possible to use a plurality of mobile phones at the same time only in the same group to make a conference call. A call control system for cordless telephones.