JP2878123B2 - Broadcast transmission method in digital cordless telephone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone system and, more particularly, to a broadcast transmission method using communication between slave units.

[0002]

2. Description of the Related Art As shown in FIG. 5, a simultaneous broadcast transmission system in a conventional cordless telephone system includes a plurality of slave units 50, master units 51a to 51c dedicated to incoming calls and master units dedicated to calling. 52a to 52c and an exchange 54 for connecting these base units to an extension (or outside line) telephone 53 by wire (Japanese Patent Laid-Open No. 2-241128).

In this conventional system, when a hook-off operation is performed by the extension telephone 53, the extension telephone 5
3 and the exchange 54 are linked. Subsequently, when a call is made to the child device 50 in the area, a ringing tone signal is output from the exchange 54 to the calling-only parent devices 52a to 52c. When a common ID code for performing simultaneous broadcast to the slave unit 50 is input from the extension telephone 53 by a push button operation, the ID code is transmitted via the exchange 54 to the calling-only master unit 52a-52. 52c.

Next, a call is made from the calling master units 52a to 52c to the slave units 50 in the zone, and the slave unit 50 and the calling master units 52a to 52c are connected by a wireless channel. Thereby, simultaneous broadcast listening by the slaves in the area becomes possible.

[0005]

In this conventional broadcast transmission of a cordless telephone system, since the broadcast is transmitted from the extension telephone to each slave unit via the exchange and the base unit, the extension is performed. There has been a problem that only a telephone can perform broadcast transmission.

Further, since the wireless area between the master unit and the slave unit is used, if the slave unit is separated from the master unit and leaves the area, the broadcast cannot be received. In addition, since the wireless slot of the master unit is used, there is also a problem that if another slave unit wants to use other than the broadcast during the broadcast, it cannot be connected to the master unit depending on the use status of the wireless slot.

An object of the present invention is to provide a communication method between slave units which performs simultaneous broadcast transmission without increasing the traffic amount of the master unit.

[0008]

SUMMARY OF THE INVENTION In a method for simultaneous transmission between slave units according to the present invention, a plurality of slave units are constituted by a plurality of groups identified by group numbers, and a certain slave unit designates a group number. makes a call Te, is called
When a response is received from the slave having the group number and a wireless channel is formed with the plurality of slaves having the group number, a plurality of wireless channels on which the wireless channel is formed are formed.
The handset is prohibited from transmitting and operates only by receiving, and the calling handset performs simultaneous broadcast transmission to a plurality of handset units in which a wireless channel is formed.

In other words, each slave unit in the present invention
Having a group number in addition to the individual number, only when a group number that matches its own group number is received, a response is returned to the calling side slave unit to form a wireless channel, and a signal from the calling side slave unit is unilaterally transmitted. To receive.

[0010] More specifically, a unique I
In addition to the D number, a specific group number is assigned in advance. Each slave unit compares the group number transmitted from the calling slave unit with the group number registered in its own station,
Only when the group numbers match, the own station returns a response to the calling side. Then, the transmitting side slave unit performs simultaneous broadcast transmission to the plurality of slave units that have returned the responses. During simultaneous broadcast transmission, the receiving handset is dedicated to reception and transmission is prohibited.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram for explaining a broadcast transmission method according to the present invention. A specific group number G is preset for a plurality of slave units in the system. As an example, it is assumed that the slave unit numbers 00 to 05 are set to the group number 77, and the slave unit numbers 06 to 09 are set to the group number 88. Also, the slave unit number 00
Is the transmitting slave unit, and the slave unit number “0” is included in the transmission area 1.
The description will be made assuming that the slaves 1 to 09 exist.

FIG. 2 is a flow chart showing the transmission operation in one embodiment of the broadcast transmission method according to the present invention.

The sender (slave number 00) is group number 8
In the case of simultaneous broadcast transmission to the slave unit No. 8 (Y in step S11), the operator sets "88" from the numeric keypad of the slave unit.
And press the off-hook key (step S1).
2). The originating slave unit 00 uses the group number 88
A wireless call is made to the child device in the transmission area (step S13). In this case, as will be described later, there is a response only from the slave units of the slave unit numbers 06 to 09 belonging to the group number 88 (step S13). When this response is received, a call can be made between the calling side and the receiving side handset.

However, the receiver on the receiving side functions as a receiver only (described later) since the transmitting function is prohibited by means such as mute. Simultaneous broadcast transmission between the slave units is realized by the one-way call from the transmission-side slave unit to the reception-side slave unit (step S15). This state ends when the on-hook key is pressed on the calling side slave unit (Y in step S16).

On the other hand, in the case of ordinary one-to-one communication between slave units (N in step S11), the operator of the calling side slave unit inputs the number of the other slave unit from the numeric keypad and presses the off-hook key. (Step S17), and calls the other handset (step S18). If there is a response from the slave unit on the receiving side (step S1)
9), a normal one-to-one call is made (step S20),
It continues until it is hooked on (step S16).

FIG. 3 is a flowchart of the incoming call operation in this embodiment. As described above, the slave unit (0
The call with the group number 88 of 0) is performed by the slave unit number 0.
1 to 09 are received. When each mobile unit receives a call (step S21), it receives the group number 88 (Y in step S22), and compares it with the group number (77 or 88) preset for each mobile unit (step S21). Step S
23). At this time, since the slave units 06 to 09 have the same group number, the process proceeds to the subsequent step S24.
０５-05 are determined to be group number mismatch (step S2).
3N), the process returns to the call waiting state.

Sub-units 06 to which group numbers are determined to match
09 returns a response to the calling side slave unit 00 (step S24), rings the ringer, and notifies the operators of the slave units 06 to 09 that there is an incoming call (step S25).

When these operators press the off-hook key (step S26), receiving becomes possible, and simultaneous broadcast is performed only to the slaves 06 to 09 belonging to the group number 88 (step S27). At this time, the transmission function of the receiving-side child device is stopped, and the receiving-side child device is exclusively used for receiving. This receiving state continues until the on-hook key is pressed (step S2).
8).

On the other hand, in the case of a normal one-to-one call (N in step S22), it is determined whether or not the received destination slave unit number matches its own slave unit number (step S29). If so, it returns to the incoming call state, and if they match, it returns a response to the calling side handset (step S30). Then, the ringer is sounded to notify the operator (step S31), and the operator presses the off-hook key (step S32) to enable one-to-one communication (step S33). In this case, since the transmitting function of the receiving handset is not stopped, normal two-way communication can be performed. This call state continues until the on-hook key is pressed (step S28).

FIG. 4 is a sequence diagram showing the simultaneous simultaneous transmission operation in FIGS. 2 and 3. First, the calling handset specifies a group number to make a call, and only the handset having the corresponding group number among the plurality of receiving handset responds. Then, when the receiving side goes off-hook, broadcast transmission is performed from the transmitting side to a plurality of receiving side child devices. At that time, the transmitting side of the receiving side slave unit is stopped, and one-way communication is performed.

[0022]

As described in detail above, the method of broadcasting between sub-units of the digital cordless telephone system according to the present invention assigns a specific group number to each sub-unit in advance.
Since it is possible to receive a call only when the group numbers match on the receiving handset, simultaneous broadcast transmission can be performed without the intervention of the master, and an increase in the traffic volume of the master can be avoided.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram for explaining a broadcast transmission method according to the present invention.

FIG. 2 is an operation flowchart of a transmitting side in a broadcast transmission method according to an embodiment of the present invention;

FIG. 3 is an operation flowchart of a receiving side in the embodiment.

FIG. 4 is a sequence diagram at the time of simultaneous broadcast transmission in the embodiment.

FIG. 5 is a block diagram showing an example of a conventional broadcast transmission system.

[Explanation of symbols]

 1 Transmission area 00-09 Slave unit number 77 Group number 88 Group number

Claims (2)

(57) [Claims] 1. A digital cordless telephone system comprising a master unit and a plurality of slave units, wherein the plurality of slave units include a plurality of groups identified by a group number, and an arbitrary slave unit specifies a group number. Make a call and the called group number
When a response is received from the slave unit having the group number and a wireless channel is formed with a plurality of slave units having the group number,
The plurality of slave units in which the wireless channel is formed operate only for receiving while the transmission is prohibited, and the transmitting side slave unit performs simultaneous broadcast transmission to the plurality of slave units in which the channel is formed. A broadcast transmission method using communication between slave units. 2. A digital cordless telephone system comprising a master unit and a plurality of slave units, wherein each of the slave units has a group number in addition to an individual number, and receives a group number matching its own group number. Only when a response is returned to the calling side slave unit, a wireless channel is formed, and when the wireless channel is formed, transmission is prohibited and only the receiving side operates, and the signal from the calling side slave unit is unilaterally received. , A simultaneous broadcast transmission method.