JPH06188823A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To provide a cordless telephone device system capable of preventing the competition of the confirmation of a control channel and the interference of a control signal. CONSTITUTION:A group using only one control channel (46ch) of two control channels, and the group using only the other control channel (89ch) are provided by using the least significant digit of the ID number of a master device, and a set constituted of two master devices by selecting each one from both the groups, that is, the first set (ID0, 1), second set (ID2, 3), third set (ID4, 5), fourth set (ID6, 7) and fifth set (ID8, 9) are prepared. Thus, the transmitting timing of the control signal of each set is made different from each other just like (a) to (e) so that the transmitting time zone of the control signal from the master devices of each set can be prevented from being overlapped on the transmitting time zone of the control signal from the master devices of the other set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system comprising a plurality of base units and a plurality of handset units wirelessly connected to the base units.

[0002]

2. Description of the Related Art In this type of cordless telephone system, as shown in FIG. 6, a plurality of base units 2 are connected to a main unit 1 having a function as an exchange, and a handset unit 3 is wirelessly connected to these base units 2. Connected.

The processing at the time of an incoming call in such a telephone device will be described. First, when the main device 1 detects an incoming call on the telephone line, a 16 Hz call signal is sent from the main device 1 to the master device 2. Upon receiving this calling signal, the base unit 2 confirms that the control channel is available, and receives the incoming signal and ID.
A control signal including a code, a correction code, a call channel designating code, etc. is sent to the handset 3. The child device 3 which confirms that the ID is his / herself returns a response signal to the parent device 2 in response to the incoming signal. The master unit 2 which has confirmed the response signal,
The ringer ringing signal is sent to the handset 3 using the call channel designated previously. The cordless handset 3 receives a ringer ringing signal on the same call channel and rings a ringer sound. Then, when a call operation is performed by the handset 3, an off-hook signal is sent to the base unit 2, and then the line is connected to enable the call.

[0004]

By the way, in such a telephone device, all the handset units 3 may be activated by a command from the main unit 1. When such a command is issued from the main device 1, each master device 2 simultaneously confirms the availability of control channels and sends a control signal to the slave device 3 using the available control channels.

However, according to the standard for the low power cordless telephone device, the number of control channels is limited to two. Therefore, if three or more master devices 2 are provided, the same control channel can be used for a plurality of master and slave devices. Will be used between
Control signal interference occurs. That is, the control signal includes an ID code (which differs between devices) in addition to the incoming signal, and since this is transmitted as a digital signal, bit garbling or the like occurs due to interference, and the handset 3 side It may happen that the received control signal cannot be decoded. Therefore, cordless handset 3
However, even though it is being called, it cannot detect that, and there is a problem that it becomes difficult for the slave unit 3 side to receive an incoming signal.

In view of the above circumstances, it is an object of the present invention to provide a cordless telephone device which can eliminate control channel conflict and prevent control channel interference.

[0007]

In order to solve the above problems, a cordless telephone device according to the present invention comprises a plurality of base units and a plurality of handset units wirelessly connected to the base unit.
In a cordless telephone device that sets a call channel between a parent and child using a control channel, the parent device is divided into a group that uses only one control channel of two control channels and a group that uses only the other control channel. Select one group from each group to create a group consisting of two master units, and make sure that the master unit's control signal transmission time period does not overlap with the control signal transmission time period of other group's master units. , A means for varying the transmission timings of the control signals of the respective groups from each other is provided.

[0008]

According to the above construction, even when all the slaves are made to ring, the slave can surely receive the incoming signal and respond to it.

That is, when one set of master units sends a control signal, the other set of master units does not send a control signal, and the two master units constituting the set have different control channels. Since the control signal is sent to the slave unit at, the interference of the control signal is avoided, and it becomes possible to reliably detect the control signal on the slave unit side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS. For convenience of explanation,
FIG. 6 used in the conventional example is used again here.

The cordless telephone device according to the present invention is shown in FIG.
As shown in, the main device 1 having a function as an exchange,
It is composed of a plurality of parent devices 2 connected to the main device 1 and a child device 3 wirelessly connected to each parent device 2.

The corresponding master unit 2 and slave unit 3 have a common ID.
It is connected by (call code). If the number of the master device 2 is 10, the ID number is assigned such that the minimum digit is 0 to 9. This minimum digit is even (0,
Groups of 2, 4, 6, 8) and odd numbers (1, 3, 5, 5)
7 and 9) groups, and select one from each group, and in the ascending order of the smallest digits of the ID, set the 0. 1 base unit as the first group and the 2 and 3 base units as the first group. There are two groups, the parent unit of 4.5 is the third group, the parent unit of 6.7 is the fourth group, and the parent unit of 8.9 is the fifth group.

FIG. 5 is a block diagram showing a schematic configuration of the master unit 2. The main | base station 2 is provided with the transmission part 11, the reception part 12, the control part path 13, and the interface 14.

The interface 14 is connected to the main unit 1 and receives signals received by the receiving unit 12 from the main unit 1.
And the signal from the main device 1 to the transmitter 11.

The transmitter 11 and the receiver 12 have a total of 89 channels. Of the 89 channels, the 46th and 89th channels are control channels for transmitting and receiving control signals, and the remaining 1 to 4 channels.
Channels 5 and 47 to 88 are call channels for voice transmission and reception.

In this embodiment, the even group uses only the 46th channel as a control channel, and the odd group uses only the 89th channel as a control channel. As a result, each set described above is composed of two master units that use mutually different control channels. A channel is a name in which a transmission frequency and a reception frequency are a set, and the transmission frequency and the reception frequency are set to different values in order to enable bidirectional communication.

The control unit 13 executes an operation in accordance with a predetermined procedure when a call is made from the handset 3 and when an incoming call is received.

FIG. 4 is an explanatory diagram showing the basic operation on the master side and the slave side when an incoming call arrives. First, when the master device 2 receives the call signal from the main device 1, the control unit 1 of the master device 2
3 confirms the availability of the control channel using the receiving unit 12, and sends the control signal including the incoming signal, the ID code, the correction code, and the communication channel designation code to the handset 3 on the available control channel. To do. The child device 3 which confirms that the ID is his / herself returns a response signal to the parent device 2 in response to the incoming signal. The master unit 2 that has confirmed the response signal sends a ringer ringing signal to the slave unit 3 using the communication channel previously specified. The cordless handset 3 receives a ringer ringing signal on the same call channel and rings a ringer sound. Then, when a call operation is performed by the handset 3, an off-hook signal is sent to the base unit 2, and the control unit 13 that detects this sends the
The main device 1 is requested to connect the line through the interface 14, and the line is connected to enable the call.

FIG. 1 is a timing chart showing the operation of sending the control signal among the above-mentioned operations in the "HIGH" state. In this example, first of all,
A control signal is transmitted all at once from all base units 2. If the control signals are sent all at once to all the master units 2 as described above, a problem such as control signal interference may occur as described in the conventional example, but it is not always necessary to ring all the slave units 3. In consideration of the fact that it may not be requested, or that even if the control signals are sent all at once, interference may rarely occur, such batch transmission processing is added.

After the above-mentioned simultaneous transmission processing, in the group which can receive the response signal, the call channel switching processing and the like are executed in the base unit 2 and the handset 3, and the subsequent operations such as ringer ringing are performed. become. On the other hand, in the group that did not receive the response signal, a set in the figure is set for that group.
After one of the waiting times indicated by ~ e, the second control signal sending operation is executed.

The waiting times a to e in the figure are set such that the lengths of the groups differ. For example, the waiting time of a is 240 ms, the waiting time of b is 800 ms, the waiting time of c is 1440 ms, and so on. The sending time zones are adjusted so that the groups do not overlap.

FIG. 2 is a time chart showing in detail the processing contents and processing time in the time chart of FIG. 1 for the first set and the second set. In this figure, I
Indicates a time zone for searching a call channel and a control channel, II indicates a time zone for processing for setting a receiving section and a transmitting section on a control channel, III indicates a time for control signal transmission processing, and IV indicates a child device 3 The response signal waiting time zone from is shown.

The channel search in the process I can be performed by sequentially changing the receiving channels of the receiving section 12 and checking the presence or absence of carrier waves. Process II
Is 200 in consideration of the stabilization time of the PLL circuit (not shown).
It is set to ms. In the process III, the same data is transmitted 12 times during the 600 ms. Further, in this process III, the response signal from the handset 3 is monitored even during the transmission of the control signal, and if the response signal is obtained during this time, the process shifts to the communication channel switching process at that time.

FIG. 3 is a flow chart showing the control contents of the called process by the control unit 13. Steps S5, S6, S7, S8, and S9 of this flowchart show a time waiting process for making the transmission timings of the control signals of each set different from each other. That is, the first group of master units (ID0, 1) executes the process of I for 240 ms by passing through step S5, and the second group of master units (ID2, ID2).
3), the processing of I is performed 840 by going through step S6.
The master unit (ID4, 5) of the third group executes the process of I for 1440 ms by executing the process of step S7 for the master unit of the fourth group (ID6, 7). By passing through S8, the processing of I is executed for 2040 ms, and the fifth
The parent device (ID8, 9) of the group will execute the process of I for 2640 ms by going through step S9.
Subsequent processing of II, III, and IV will be delayed by the waiting time.

The process II includes steps S12 to S14.
Accordingly, the process III is performed by steps S15 to S16.
The process IV is performed by steps S19 to S22. The call processing in step S2 includes processing such as call channel switching, ringer detection, line connection, and line disconnection. If an empty channel can be confirmed in step S10, the process proceeds to process II. If no empty channel can be confirmed, the process is not moved to the subsequent process II, and the period until the next process II is reached (in the case of the first group, (3000 ms), the process I is continuously executed (step S11).

According to the above construction, even when all the slaves 3 are made to ring by the command from the main unit 1, the slave 3 side can surely receive the incoming signal and respond to it. become.

That is, when one set of master units 2 and 2 sends a control signal, the other set of master units 2 does not send a control signal, and furthermore, the two master units 2 and 2 which form the set. Since No. 2 sends control signals to the handset 3 on different control channels (46ch and 89ch), interference of the control signals is avoided and the handset 3 side can reliably detect the control signal. Become.

Here, in FIG. 2, the second set (ID2, 3)
While the second processing I in FIG.
D0, 1) uses the control channel by the processing of II and III, but in the processing III, the same data is transmitted 12 times during that period, and the slave unit is transmitted at the stage of the several transmission. 3 often detects an incoming signal and switches to the talk channel between the parent and child at an early stage of the process III, which frees the control channel, so at the end of the second process I of the second set. The second group can confirm the availability of the control channel.

In the present embodiment, the grouping of the master unit 2 is performed according to whether the smallest digit of the ID number is an even number or an odd number. However, the present invention is not limited to this. For example, the smallest digit of the ID number is You may divide into the group of 0-4 and the group of 5-9. Furthermore, other than the ID number, the parent machine may be divided into two groups according to some number given to each parent machine.

[0030]

As described above, according to the present invention, it is possible to prevent a problem that occurs when a plurality of master units simultaneously ring the slave units, that is, a problem such as control signal interference.

[Brief description of drawings]

FIG. 1 is a time chart showing a control signal transmission timing of the present embodiment.

FIG. 2 is a time chart specifically showing processing contents and processing time for the first set and the second set of FIG.

FIG. 3 is a flowchart of a called process according to this embodiment.

FIG. 4 is a basic operation explanatory diagram between parent and child devices when an incoming call is received.

FIG. 5 is a block diagram showing a schematic configuration of a master unit.

FIG. 6 is a block diagram showing a schematic configuration of a cordless telephone device.

[Explanation of symbols]

 1 main device 2 master unit 3 slave unit 11 transmitter 12 receiver 13 controller 14 interface

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshihiro Sasaki 3-201 Minamiyoshikata, Tottori-shi, Tottori Sanyo Electric Co., Ltd. (72) Inventor Koji Kondo 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Shinichi Hayashi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] 1. A cordless telephone device comprising a plurality of base units and a plurality of handset units wirelessly connected to the base unit, wherein a control channel is used to set a call channel between the parent and child The master unit is divided into a group that uses only one control channel of the channels and a group that uses only the other control channel, and select one from each group to create a group consisting of two master units. In order to prevent the control signal transmission time zone of the master unit from overlapping with the control signal transmission time period of the other group of master units, a means for varying the control signal transmission timing of each group is provided. Cordless telephone device.