JPH02150131A - Cordless telephone - Google Patents

Abstract

PURPOSE:To perform a simultaneous call in a short time by selecting one of residual slaves when no response is obtained from the slave selected as a representative, polling plural slaves by a master when the response is obtained, and opening a speech channel between the slave from which the response is obtained. CONSTITUTION:When the simultaneous call for plural handsets are performed, calls are placed to the plural handsets by selecting a representative handset. When the response from the representative handset is awaited and no response is obtained, the representative handset is selected again, and a similar processing is performed. When the response is obtained from the representative handset, polling are applied on the plural handsets, and the speech channel is opened to the handset from which the response is obtained. In such a way, it is possible to open the channel in a short time.

Description

[Detailed description of the invention] The explanation will be given in the following order.

A. Industrial application field B. Summary of the invention C Conventional technology D Problems to be solved by the invention E. Means to solve the problem (Figure 1) F. Effect G Example (Figures 1 to 8) Effect of H invention A. Industrial application field This invention relates to a cordless phone.

B. Summary of the Invention The present invention is a multi-cordless telephone that allows simultaneous calling in a short time by performing calling processing on a plurality of handsets in a predetermined sequence.

C. Conventional Technology A low-power type cordless telephone uses the MCA system, and has 87 communication channels and 2 control channels.

Therefore, as an expanded version of the functions or capabilities of such a cordless telephone, for example, as shown in Fig. 9,
A so-called multi-cordless telephone is being considered in which a plurality of slave units can be used in combination with one base unit.

In other words, the figure shows a case where up to 8 slave units can be used.
(1 person) ~ (IH) indicates the handset (child unit), (2) indicates the base station (master unit), (3) indicates the telephone line, and any handset and base station (2) are connected by radio waves. A call is then made between the handset and the other party.

By the way, in such a multi-cordless telephone, for example, when a call arrives, the base station (2) calls all the handsets (LA) to (IH) at the same time. There are possible ways.

■ Handsera) (IA) to (IH) are called one by one, and after this call is completed, handseras) (LA) are called.
) to (IH).

■ All handseras) (IA) to (11()) are called at the same time, and any handset responds to this call.

(2) All handsets (LA) to (IH) are called at the same time, and a predetermined specific handset (hereinafter referred to as the "representative handset") responds to this call.

D. Problem to be solved by the invention However, with the method (■), calling takes time.

That is, since the handsets (IA) to (IH) naturally operate using a battery (generally a rechargeable battery) as a power source, it is necessary to reduce current consumption as much as possible. Therefore, the actual handsera) (IA) ~ (
For example, as shown by the solid line in Figure 10A, the IH) enters the receive mode for 0.2 seconds every 2 seconds and performs only the reception operation, and the remaining 1.8 seconds are in the sleep mode (power down mode). mode), and in this sleeve mode, all power is turned off except for a small part of the control circuit. In addition, each handset (1 person) (IA
) to (IH) are not synchronized, but are disjointed.

Then, if the base station (2) needs to call, for example, a handset (LA) at an arbitrary time t, the base station (2) will send a command signal to the handset (one person) as a command signal, as shown in the same figure. ) is repeatedly transmitted over a period of, for example, 2.5 seconds.The length of one call signal is, for example, 120 msec, and is transmitted through a downstream IL control channel.

And like this, base station (2) is 2.5
If you send a ringing signal repeatedly for several seconds,
During that 2.5 seconds, the hand 7 (IA) is always in the receiving mode at least once, so it will receive the call signal at time t2, for example.

Therefore, when the handset (lA) receives a paging signal at time t2, it continuously enters the reception mode as shown by the broken line in A of the same figure, and the paging signal from the base station (2) is received at time t3. When finished,
As shown in Figure C, at time t4 after a predetermined period τ from time t3, a response signal indicating that the paging signal has been received is transmitted to the base unit (2) through the upstream control channel. .

After that, predetermined processing is performed and the handset (I
A communication channel is opened between A) and the base station (2).

However, in the MCA cordless telephone, the control channel is from the handset (IA) to (IH).
It can only be used to open a communication channel between the control channel and the base unit (2), and the use of the control channel for other purposes is prohibited.

Therefore, when calling all at once using method (■), all handseras (IA) to (IH) are called in order through the downlink control channel, and after this call is completed, all handseras (IA) to (IH) are called. A response is received on the uplink control channel, and a communication channel is opened to the handset that received the response, and the handset rings.

And, as mentioned above, it takes at least 2.5 seconds (period t1 to 1+) just to call one handset, so method (2) calls for 8 handsets).
By simply calling (IA) to (IH) one by one, 2
It took 0 seconds (= 2.5 seconds x 8 units),
This is not practical.

On that point, in method ■, the handset (1^) ~
If even one of the handsets (IH) responds, a communication channel is subsequently opened between the responding handset and the base station (2), and it does not take a long time as in method (2).

However, with this ■method, the handsera) (IA)
Two or more of the IHs (IHs) may transmit response signals at the same time at time t, which causes interference and prevents the base station (2) from correctly receiving the response signals. (2) may not be able to open a call channel.

In addition, in the method of ■, the base station (2)
In response to the call, only the representative handset transmits a response signal at time t4, so ■.

This method does not cause any problems like the method (2).

However, with this method (■), when the representative handset is unable to receive a call signal from the base station (2), for example, when the battery voltage of the representative handset is low, or when the representative handset is malfunctioning, when another cordless telephone is using the control channel in the area where the representative handset is located, or when the representative handset is out of coverage range, the call processing receives a response signal from the representative handset. It will stop.

This invention attempts to solve the above problems.

E Means for solving the problem Therefore, in this invention, when calling all at once,
One of the slave units is selected as the representative, and data indicating the slave unit selected as the representative and data indicating a simultaneous call are transmitted through the control channel, and if no response is obtained from the slave unit selected as the representative, the remaining One of the slave units is selected as the representative, and the above process is repeated. When a response is obtained from the slave unit selected as the representative, the base unit polls multiple slave units and responds to this polling. The system performs processing to open a communication channel with the handset with which the communication occurred.

F. Even if there are handsets that do not respond, the system will not go down and a call will be made in a short time.

G. Embodiment In the example shown in FIG. 1, there are two outside lines, up to eight slave units can be supported, and only one control channel is used.

In the figure, (IA) to (IH) indicate first to eighth handsets. These handsets (IA) to (IH)
) have the same configuration, so the handset (IA
), (110) is a transmitting circuit, and (120) is a receiving circuit. The transmitting circuit (110) receives the audio signal St and the command signal CM.
NO (details will be explained later) is the FM signal S of the upstream channel.
The receiving circuit (120)
1 receives the FM signal Sd of the downlink channel and demodulates the audio signal Sr and command signal CMNO.

Also, (131) is a dial key, (132)
is a talk key, and this talk key (132) is a non-locking type button switch.
32) Each time you press , the handset (IA) toggles between standby mode and talk mode. When the handset (1^) is in standby mode, it alternates between reception mode and sleeve mode on the downlink control channel, as explained in FIG. 10, and when it is in talk mode, it performs continuous reception and transmission. conduct.

Furthermore, (133) to (137) are auxiliary keys such as extension keys configured with non-locking type bush switches, (139) is a ringer speaker,
(140) is a microcomputer for system control. Then, in this microcomputer (140), a command signal C! is transmitted by a transmitting circuit (110). A N D is formed, and the command signal CM taken out from the receiving circuit (120)
NO is determined. The microcomputer (140) also outputs control signals TCTL and RC that control the transmission permission/prohibition of the transmission circuit (110) and the channels on which the transmission circuit (110) and the reception circuit (120) perform transmission and reception.
TL is also formed.

Furthermore, (141) is a RAM, and this RAM (1
41) stores a 25-bit system identification code 5YID for identifying this multi-cordless telephone from other cordless telephones. Furthermore, the handsets (IA) to (1st) are marked with "1" to "1" to identify these handsets (IA) to (IH) from each other.
8" handset number is assigned (the order of assignment is arbitrary), and the handset number is assigned to the RA as a 4-bit handset identification code H3ID.
M (141). Note that when the identification code (handset number) H3ID is "0", all handsets (LA) to (IH) correspond.

Also, (2) is the base station, (3A), (
3B) indicates a telephone line (external line). Then, leave base station (2) 1, (218) to (21C)
+ indicates the base unit, these base units)
(21A) to (21C) are handsets (IA)
It has a transmitting circuit (210) and a receiving circuit (220) similar to the transmitting circuit (110) and receiving circuit (120) in ~(IH). However, each receiving circuit of these base units (21A) to (21C) (
220) to (220) are continuously in reception mode on the uplink control channel when not talking.

Sarani, at base station [2], (22)
(23A) and (23B) are external line interface circuits, and (24) is a mask control microcomputer. In this case, the switch circuit (22) is connected between the base unit γ) (21A) to (2IC) and between the base unit (21A) to (2IC) and the interface circuit (23^) according to the purpose of communication.

(23B). In addition, the interface circuits (238) and (23B) are
4-wire/2-wire conversion circuit (231), switch circuit (232) compatible with the hook switch of general telephones, dial tone signal (DTMF signal) formation circuit (233)
), a ring tone signal detection circuit (234), and the like.

Furthermore, the microcomputer (24) is connected to the handset (IA)
In addition to performing the same processing as the microcontroller (140) in the (IH), the handset (IA>~(1)1)
Call channel, base unit (2LA) ~ (2
1C), line (3A).

(3B) It manages the operation of all 0 units of this cordless telephone, such as the usage status. And (241)
is a ROM, and a system identification code 5YID is written in this ROM (241).

FIG. 2 shows an example of the signal format of the command signal CMND. This signal CMNO has a 24-bit bit synchronization signal BSYN at the beginning, followed by a 16-bit frame synchronization signal FSYN. In this case, these signals BSYN, FSYN are for example BSYN
＝“101010・・・・・・・・・・・・10”FS
YN="1100010011010110"...
・・FSYN for upstream channel = “1001001100110110”・
...has a specific bit pattern indicated for the downstream channel.

Further, the command signal CMNO includes, in order, a 25-bit system identification code 5YID, a 12-bit error correction code ECC for this code 5YID, and a 3-bit dummy bit DBIT following the signal FSYN. A 5-byte control code CTRL follows the dummy bit DBIT.

In this case, the control code CTRL is its first byte CT
LI is a code indicating the control contents of the handset (IA) to (IH) and the base station (2), and the second
Byte CTL2 to fifth byte CTL5 are the first byte C
These are parameters or data related to TLI.

Example Eva, the base station (2) is connected to the handset (I).
When notifying the channel number of a call channel to any of A) to (IH), CTLI: Code indicating that it is a call channel notification CTL2: Handset identification code of the other party's handset H3ID CTL3: Call channel Channel number CTL4.
CTL5: Considered a dummy. Note that in most cases, the second byte CTL2 is the handset identification code HSID as described above.

When the handseras (LA) to (IH) or the base units (21^) to (21C) receive this command signal CMNO, the microcontrollers (140
) Or in (24), the identification code 5YID (and H3ID) included in the signal CMNO is your RAM (141) or ROM (241).
Identification code 5YID (and ll
5ID), and only when they match, the command signal CMNO is made valid, and when they do not match, it is made invalid.

[Make a call from the handset]

A call to an outside line from a handset (LA) to (IH) is made, for example, as shown in the connection sequence shown in FIG. That is, in the figure, vertical solid lines indicate channels used by the handset and base unit, C is a control channel, and ■ is a speech channel. Also, when the solid line indicating this channel is a single line, it is in sleeve mode (this is only for handsets), and when it is a double line, it is in receive mode, and transmission is also allowed during the hatched period. show. Furthermore, although the vertical direction is the time axis direction, for convenience of drawing, this time axis is not linear; for example, in the connection sequences of FIGS. 5 and 6, the time axis is the period TI.

T 2 and T 3 are sufficiently short compared to the period (1+ to t3).

For example, when the handset (IA) is in standby mode, when the talk key (132) is pressed, this is detected by the microcomputer (140), and the microcomputer (140) supplies a transmission control signal TCTL to the transmitting circuit (110). This causes the transmission circuit (11
0) and the receiving circuit (120) are allowed to transmit and receive on the control channel and are placed in talk mode, and the control code CTRL indicates a call request and its handset identification code HSID. A command signal CMNO is formed and this signal CMNO is supplied to the transmitting circuit (110).

Therefore, in the transmitting circuit (110), the signal C
The MNO is converted into an FM signal (FSK signal) Su of the uplink control channel, and this signal Su is sent to the antenna (100
) to the base station (2).

Then, in the base station (2), the signal (radio wave) Su is received by the antenna (200), and this received signal Su is transmitted to the base unit (21).
A) to (2IC) are supplied. In this case, for example, if the base unit (21A) is vacant, the receiving circuit (21A) of the base unit (21A) is vacant.
20) is in the reception mode of the uplink control channel, the command signal CMNO is demodulated from the FM signal Su in this reception circuit (220), and this signal C
MNO is supplied to the microcomputer (24), and the signal CM N
Identification code 5YID included in O is ROM (241)
It is checked whether it matches the identification code 5YID.

And in this case, along with matching, the handsera)
Since the call request is from the IA, the microcomputer (24) supplies the transmission control signal TCTL to the transmission circuit (210), which allows the transmission circuit (210) to transmit on the downlink control channel. In the microcomputer (24), the control code CTRL is a command signal C indicating permission to make a call, the handset identification code 1lsID, and the channel number of the communication channel.
An MNO is formed and provided to a transmit circuit (210).

Therefore, in the transmitting circuit (210) of the base unit (21A), the signal CMNO is converted into the FM signal Sd of the downlink control channel, and this signal Sd is sent to the handset (IA) through the antenna (200).
~(IH).

Then, in the handset (IA), FM is transmitted from the base station (2) through the downlink control channel.
When the signal Sd is transmitted, this antenna (100
) is received by the receiver circuit (120), and from the receiver circuit (120) is a command signal CM.
NO is taken out and supplied to the microcomputer (140).

Then, the identification code 5YIS, )IsID included in the command signal CMND is
Since it matches the identification code 5YIS and H3ID stored in the transmitter circuit (110) and receiver circuit (1
20) is the control signal TCTL.

RCTL switches to the communication channel of the channel number indicated by the control signal CTRL in the received command signal CMND.

In addition, in the base unit (21^), when the command signal CMNO instructs the handset (IA) to a communication channel, the microcomputer (24) then sends the transmission control signal TCTL and The transmission circuit (210) and the reception circuit (220) are supplied with the reception control signal RCTL, and the transmission circuit (210) and the reception circuit (220)
The communication channel is switched to the channel number specified by the microcomputer (24) to the handset (18).

Therefore, the handset CIA) and the base unit)
This means that a communication channel has been opened between (21A) and (21A).

At this time, the remaining handsets (IB) to (IH)
The FM signal Sd sent from the base station (2) is received, but the sent handset identification code H3ID does not match your own, so it remains in standby mode on the downlink control channel. be done.

Subsequently, in the hand cell (LA), a command signal CMNO is formed whose control code CTRL indicates that the switching to the speech channel is completed, and this signal CMNO is used as the F of the switched speech channel.
M(?i) is transmitted to the base station (2) by Su.

This FM signal Su is transmitted to the base station (21
A) whose command signal C14N is received by
When D is supplied to the microcomputer (24), the microcomputer (24)
At >, a command signal CMNO whose control code CTRL indicates a response is formed, and this signal CMNO is transmitted from the base unit (21A) to the handset (IA) by the FM signal Sd of the switched communication channel.

Furthermore, in the base station (2), among the interface circuits (23A) and (23B),
In the case of the vacant interface circuit shown in the figure, the interface circuit (23A) is selected and its switch circuit (232) is turned on (off-hook state), and the switch circuit (22) is controlled to switch to the base unit. The transmitting circuit (210) and the receiving circuit (220) of (21A) are connected to the converting circuit (2) of the interface circuit (23A) through the switch circuit (22).
31) Connected to.

Therefore, the base unit (21A) includes the switch circuit (22) and the interface circuit (23A).
As a result, the handset (IA) is connected to the circuit (21A) through the circuit (21A).
This means that it is connected to line (3A) through (22) and (23A).

[Call]

Next, when the caller enters the other party's phone number using the dial key (131) on the handset (IA),
A command signal CMND indicating that the control code CTRL is the transmission of a telephone number and the telephone number is formed, and this signal CMND is connected to the FM signal Su of the communication channel.
is converted and sent.

Therefore, at the base station (2), the command signal c! AND is the base unit) (21
The control code CTRL of this signal CλiNO is obtained from the receiving circuit (220) in A), and since the control code CTRL indicates that a telephone number is to be sent and indicates the telephone number, the forming circuit (233) uses the microcomputer (24) to transmit the telephone number. A dial tone signal corresponding to the telephone number sent from the handset (IA) is controlled according to the telephone number, and this signal is transmitted to the telephone line (3A) through the conversion circuit (231) and further through the switch circuit (232). ).

When the other party answers the phone, the voice signal Sr from the other party is sent to the base unit (21A) through the signal line of line (3A) -> switch circuit (232) - conversion circuit (231) -> switch circuit (22). Transmission circuit (2
10). Therefore, the signal Sr is converted into the FM signal Sd of the downlink communication channel, and this signal Sd is transmitted from the antenna (200).

Then, this signal Sd is received by the handset cell (IA) and sent from the receiving circuit (120) to the audio signal S.
r is taken out, and this signal Sr is sent to the receiver (121).
is supplied to

Furthermore, when transmitting a call, the audio signal St from the transmitter (111) is supplied to the transmitter circuit (110) and converted into the FM signal Su of the uplink communication channel, and this signal S
u is transmitted from the antenna (100) to the base station [2].

Then, at the base station (2), the signal Su is received by the base unit (21A), and the signal St is taken out from the receiving circuit (220).
This signal St is transmitted from the switch circuit (22) to the interface circuit (23A) to the conversion circuit (231), -
The signal is supplied to the lines (3 people) through the signal line of the switch circuit (232) and sent to the other party's telephone.

[End episode]

When the call ends, as shown in Figure 4, when the talk key (132) of the handset (IA) is pressed, a command signal CM N O indicating the end of the call with the control code CTRL and the handset identification code HSID is output. This signal CMNO is the FM signal S of the communication channel.
u to the base station (2).

Then, the receiving circuit (220) of the base unit (21)
The command signal C+, INO is taken out from
The microcomputer (24) determines that the call is over.

As a result, the transmission of the transmitting circuit (210) of the base unit (2LA) is prohibited by the control signal TCTL, and the receiving circuit (220) is prohibited from transmitting by the control signal RC.
TL sets the uplink control channel reception mode. Further, the switch circuit (232) of the ink-face circuit (23A) is also turned off (on-footer state).

Furthermore, in the handset (IA), after transmitting the command signal CM N O indicating the end of the call, the transmitting circuit (110
) is prohibited from being transmitted by the control signal TC, and
The receiving circuit (120) is put into standby mode on the downlink control channel by the control signal RCTL.

[Call to handset]

An incoming call from an outside line to a handset (IA) to (IH) is performed, for example, by the routine (700) of the flowchart shown in FIGS. 7 and 8, as in the connection sequence shown in FIGS. 5 and 6. (800). However, FIG. 7 shows the case when the handset initially set as the representative handset responded correctly, and FIG. 8 shows the case when it did not respond correctly. Further, the routine (700) is written to the ROM (not shown) of the microcomputer (24) and executed by the microcomputer (24), and the routine (800) is executed by the microcomputer (24).
is the ROM of the microcomputer (140) (not shown)
The program is written to the microcomputer (140) and executed by the microcomputer (140).

Here, the operation of the base station (2), which has a complicated connection sequence, will be explained collectively.

That is, when a telephone call is received through the line (3A), for example, the ring tone signal is detected by the detection circuit (234) of the interface circuit (23A), and this detection signal is supplied to the microcomputer (24).

Then, the routine (700) is executed by the microcomputer (24).
is executed, and in step (701), a vacant base unit among the base units (21A) to (21C), for example, the base unit (21C) is selected.
8) is selected, and then in step (702), the identification code HSID of the vacant handset among the handsets (IA) to (IH) is selected by the microcomputer (2).
4) is registered in the free handset table HST8 of the RAM (not shown).

However, in this case, for a handset that has already opened a channel with the base station (2), when opening that channel, the identification code ll5ID of that handset can be known, so it is possible to know the identification code ll5ID of the handset when opening that channel. Although the handset is not registered in the free handset table HSTB, the remaining handsets may be in a state where they cannot open a channel due to low battery voltage, malfunction, or being out of communication range. Since the microcomputer (24) cannot identify such handsets, such handsets are also registered in the table 115TB.

Next, in step (711), it is checked whether the table HSTB is empty, and if it is empty, the process proceeds to step (719). (242) is activated and an alarm sound is sounded from the speaker (243), informing that there is an incoming call but no handset is available.

Then, in step (711), table H
If 3TB is not empty, the process goes to step (712)
Then, one of the handsets registered in the table HSTB, for example, handset (IA), is selected as the representative handset.

Then, in step (713), the control code CTRL indicates that there is an incoming call, the identification code H3ID of the representative handset (in this case, the handset (IA)), the channel number of the call channel, and the A command signal CMNO indicating an incoming call is generated, and this signal CMNO is transmitted via the downlink control channel by the base unit selected in step (701), in this case, the base unit (21A). be done. Note that this signal CM N
The transmission of O is for 2.5 seconds (period t1 to t3 in Figure 10)
repeated over a period of time.

Then, when the transmission of the signal CMNO is finished (time t3)
, steps (714) to (716), in the base unit (21A), the uplink control channel is monitored for a predetermined period T1 and a command signal CMNO indicating an incoming call response from the representative handset (18) is output. The presence is checked.

Then, at time t, within period T, the representative handset (
When the command signal CMNO for incoming call response from IA) is received, the process proceeds from step (715) to step (
721). Also, the connection sequence is as follows:
It will be as shown in Figure 5.

Then, in step (721), the channel of the base unit (21A) is switched from the control channel to the communication channel instructed in step (713). Next, steps (722) ~(
724) In the base unit (21A), the communication channel switched in step (721) is monitored for a predetermined period T2, and a control code CTRL is sent from the representative handset (one person) as a command signal C indicating completion of channel switching. !,I
A check is made to see if a NO was sent.

Then, a command signal CMN indicating completion of channel switching
If D is not transmitted within the period T2, the base unit (21A) is reset to the original standby state by step (725) and this routine (
700), but when the command signal CMNO indicating completion of channel switching is transmitted within the period T2, the process proceeds from step (723) to step (731), and this step (731)
, a command signal CM N D is formed indicating that the control code CTRL rings, and this signal C
MND is transmitted over the speech channel.

Then, steps (732) to (735)
As a result, valid handsets registered in the free handset table H3TB are polled. That is, in step (732), the control code CT
The RL is a request for a called response and the handset identification code H8ID (in this case, the handset (1
8) Command signal CM indicating code H3ID)
ND is formed and this signal CMNO is transmitted over the communication channel.

Then, when the command signal for the called response request is received by the handset (IA), the handset (IA) (L
From A), the control code CTRL is a called response, the identification code H5ID and the keys (132) to (1
37) is pressed, and if so, which key is the command signal CM
NO is sent through the speech channel.

Then, in step (733), the control code CTRL of the transmitted command signal CMND is checked, and the control code CTRL is input to the talk key (132).
) does not indicate that it has been pressed, and when the base unit (218) cannot receive this command signal CMND itself, the process proceeds to step (733).
Then, in this step (734), it is detected whether a ring tone signal detection output is obtained from the detection circuit (234), that is, whether the other party is still waiting for a response. , when the detection output is obtained, the process proceeds from step (734) to step (735), and in this step (735), the identification code (ISID) of the next handset from the vacant handset table H3TB, in FIG. ) The identification code H3ID of (1B) is retrieved, and then the process returns to step (732).

Therefore, from now on, the vacant handset table HSTB
A command signal CMNO requesting a call response is sequentially transmitted through the communication channel to the handsets registered in !, and the command signal CI, !
Each time a NO is sent, the command line CMNO of the called response from that handset will be checked.

That is, the handsets registered in the ISTB (vacant handset table) are polled in order and a response from the handsets is awaited.

During this polling, if the other party stops calling (goes on-hook), the detection circuit (234) will no longer be able to obtain a detection signal for the ring tone signal, so the process will proceed from step (734) to step (725).
The program then proceeds to step 700 to end this routine (700).

During the polling in steps (732) to (735), for example, when the talk key (132) is pressed in the handset (IC), the next time the handset (IC) is polled, a command to respond to the call is issued. The control code CTRL of the signal CMNO indicates that any of the keys (132) to (137) has been pressed and that the press is the talk key (132).
This shows that step (73)
3), and the process proceeds to step (733).
Then, the process proceeds to step (741) - In this step (741), the switch circuit (22) is controlled by the microcomputer (24), and the transmitting circuit (210) and receiving circuit (20) of the base unit (21^) are controlled.
0) is connected to the conversion circuit (231) of the interface circuit (23A) through the switch circuit (22), and the switch circuit (232) is turned on.

Therefore, the base unit (21A) includes the switch circuit (22) and the interface circuit (23A).
This means that it is connected to the line (3A) through.

Subsequently, the process proceeds from step (741) to step (
742), and in this step (742) a command signal CMNO is formed indicating that the control code CTRL is a designation of a handset and the identification code HSID of that handset (in this case, a handset (IC)). will be sent.

Then, attach the handset (IC) to the base unit (2
1A) A communication channel is opened between the two parties.

On the other hand, in steps (715) and (716), if the command signal CMNO for incoming call response from the representative handsera (IA) cannot be received during the period T+, the process proceeds from step (716) to step (717).
Proceed to. Further, the connection sequence will be that shown in FIG. 6 from now on.

That is, within the period T, the representative handset (IA)
If there is no response to the incoming call, in step (717), the identification code 831 of the handset that has been selected as the representative handset (in this case, the handset) (CIA) is deleted from the vacant handset table HSTB, and the next In step (718), the period T,
There will be a waiting period of . This period T3 is, for example, the fifth
As shown in the figure, since the representative handset (1^) has responded normally, when the time point when the ringer's command signal CM NO is sent to the handsets (IA) to (IH) is defined as time t5, Period (t3-t5) = T+
+T'3. In other words, from the perspective of (IA) to (IH), time t3
By time t, after a period (T+ 10T3) has elapsed,
Ringer command signals CJ and lNO will be sent.

Then, when the time point t is reached in step (718), the process returns to step (711). Also, No. 1
In the communication channels (IA) to (IH), at time t, the reception mode on the communication channel is changed to the standby mode or sleep mode on the control channel.

Therefore, from now on, the next available handset, for example, handset IB, is selected as the representative handset, and the above-described process is performed on this handset IB.

Therefore, when a call arrives, one of all available handsets is selected as the representative handset, all available handsets are notified of the incoming call, and the representative handset responds to the call. The representative handset is sequentially switched until the representative handset is obtained. If there is a response to the call from the representative handset, all available handsets are polled to check for a response from the handset, and if there is a response, processing for the call is being performed.

In contrast to the processing of the base station (2) as described above, the following processing is performed in the handseras (LA) to (IH) (the connection sequence is shown in FIG. 5).

That is, all the handsets (handsets) (LA) to (Il+) that are in standby mode (excluding handsets with low battery voltage, etc.) have their receiving circuits (120) in the same state as explained in FIG. When the receiving operation starts, the routine (800) is executed.

That is, at time t2 (the absolute time of this time t2 differs depending on the handset), the microcomputer (140
) and the receiving circuit (120) start up from the sleeve mode, and in step (801), it is checked whether the carrier signal (FM signal S[]) can be received on the downlink control channel, and if it cannot be received, the microcomputer (140) The receiving circuit (120) enters the standby mode (sleeve mode) again and ends this routine (800), but when the carrier signal can be received, in step (802),
The reception continues, and then in step <803), the received signal is a command signal C! of control code CTRL indicating an incoming call according to step (713).
JND is checked, and if it does not indicate an incoming call, the microcomputer (140) and the receiving circuit (120) also go into the standby mode, sleep mode, and end this routine (800).

However, if the signal received in steps (801) and (802) is the command signal CM NO transmitted in step (713), then the signal C! , I N
Since the control code CTRL of O indicates an incoming call, the process proceeds to step (804), and this step (8
04), the transmission end time t of the FM signal Sd,
The process waits until time t, and at time t, step (
811>, the identification code ll5ID indicating the representative handset of the command signal CMNO sent in step (713) is changed to the own identification code ll5ID.
It is checked whether it matches the ID, that is, whether the handset itself is designated as the representative handset.

If this routine (800) is executed on the representative handset (in this case, the handset) (<LA), the process proceeds to step (811).
Proceed to step (812) and complete this step (8
In 12), the transmission of the FM signal Su is permitted, and a command signal CMNO is formed in which the control code CTRL indicates that it is an incoming call response and the hand sent identification code H3ID, and this signal C), I N D is transmitted to the base station (2) through the upstream control channel at time t.

Then, when this incoming call response is made within the period T1, the command signal CMND is transmitted in step (7) as described above.
15) It is determined in

Next, the processing of the microcomputer (140) is performed in step (8).
13), and in this step (813),
The command signal C! whose channel was specified in step (713) and received in step (802). The call channel is switched to the one indicated by JND, and then in step (814), the call channel is switched to the one indicated by JND.
11), it is checked whether or not it is designated as the representative handset, and in this case, this routine (800) is being executed in the representative handset (IA), so the process goes to step (814).
Proceed to step (815) and complete this step (8
In step 15), a command signal CMNO in which the control code CTRL indicates completion of channel switching is formed and transmitted through the uplink communication channel.

Note that this channel switching completion command signal CM
NO is determined at step (723).

Subsequently, in steps (821) to (823), the communication channel switched in step (813) is monitored until time t5, and step (731) is performed.
The reception of the command signal CMNO signal in response to the ringer is checked, and if the command signal CMNO signal of that ringer is received by time t, the process proceeds to step (
The process proceeds from step (822) to step (824), and in this step (824), the microcomputer (140)
The oscillation circuit (138) is controlled by the oscillator circuit (138) to form a ringer signal, and this signal is supplied to the speaker (139), which produces a bell sound indicating an incoming call.

Further, this routine (800) is executed for a general valid handset (a handset that can receive calls) other than the representative handset, in this case, the handset (1B).

(IC) etc., step (8)
12), step (817) instead of (815)
), (81g) are executed and these steps (8
17>, (818) in step (812)
, (815), and the timing with the processing in the representative handset (18) is determined.

Therefore, when the ringer command signal is sent to step (731), the representative handsera i-CIA)
and valid general handsera) (1B), (IC)
Step (824) will be executed simultaneously in such cases, and the ring tone announcing the incoming call will be heard on all valid handsets (representative hands 7) (IA) and valid general handsets (1B), (IC), etc. )
- will be sounded in unison.

Then, for all enabled handsets, the process proceeds from step (824) to step (831), in which the talk key flag TFLG is reset to "0", and then steps (832) to ( 834) is repeated.

The repetition of steps (832) to (834) corresponds to the polling in steps (732) to (735). That is, in step (832), it is determined whether the talk key (132) has been pressed, and if it has not been pressed,
Processing is from step (832) to step (833)
In this step (833), it is checked whether the command signal CλINO for the called response request from step (732) can be received, and if it cannot be received, the process returns from step (834) to step (832).

Therefore, after time t5, all valid handsets wait for human input or reception of either the talk key (132) operation, the command signal CMND requesting a called response, or the command signal CMNO designated by the handset. .

Then, on any enabled handset, when the ringer rings, if the talk key (132) is pressed, this is determined in step (832) and the process proceeds from step (832) to step (835) to flag the talk key. TFLG is set to “1”,
Processing then proceeds to step (833).

Further, when the command signal CM NO for the called response request is received in step (732), this is determined in step (833) and the process returns to step (833).
), the process proceeds to step (836), and in this step (836), it is determined based on the identification code HSID whether the called response request made in step (732) is for the user, and if it is not for the user, the call response request is determined. , the process starts from step (836) to step (
834).

However, when the call response request is for yourself,
Processing is from step (836) to step (837)
In this step (837), the talk key flag TFLG is checked and TFLG = “0”.
(When the talk key (132) is not pressed), the process proceeds from step (837) to step (83).
8), and in this step (838), the control code CTRL is changed to the command signal C\ of the called response indicating that the identification code H3ID and any of the keys (132) to (138) are not pressed. I
ND is formed and this signal CMND is transmitted over the communication channel. Note that this signal CMND is determined in step (733).

Therefore, when the talk key (132) is not pressed on all enabled handsets, the free handset table) lsT81. : Registered handsets are polled and
From the polled handset, there is a talki coo (13
2) A called response indicating that is not pressed is returned.

However, on any enabled handset, in this case the handset (ICC), the talk key (
132) is pressed, step (835) sets TFLG-“1”, so the process proceeds from step (837) to step (839), and in this step (839), control code C
TRL has identification code l-1sID and talk key (1
, 32) A called response command signal CMNO is formed indicating that the button has been pressed, and this signal CM N D is transmitted over the speech channel as in step (838). Furthermore, this signal C! , I N D are determined in step (733). Also, all handsets are
The transmission is permitted only when the command signal CMND in response to the call is returned.

And among the valid handsets, talk key (1
32) When pressed, the handset that was polled, in this case, the handset (IC)
In , the process goes from step (833) to step (
836) - Step (837) → Step (8
39), but then step (841)
In this step (841), the oscillation circuit (138) is turned off, the ringer is turned off, and the transmitting and receiving circuit (110) of the transmitting circuit (110) is turned off.
120) will be permitted to continue to be received.

Therefore, the transmitter of (IC) <111
＞ and the receiver (121) are now connected to the base unit (2LA) through the communication channel, and from now on, you can talk to the other party.

When the base station (2) receives command signals CM and 'LD indicating that the talk key (132) has been pressed in step (733), the base station (2) instructs the polled handset in step (742). In this case, use a hand cera) (I
C) command signal C! , l N D, but in a handset other than the handset (IC), the processing is performed in step (832) → (step (
835)) → Step (833) → (Step (836)
))→Step (834), and proceed to this step (
In step (834), since the command signal CMND from step (742) does not specify itself, the process proceeds from step (834) to step (842).
), and in this step (842),
The oscillator circuit (138) is turned off, the ringer is turned off, and then the standby mode, the sleeve mode, is entered.

Therefore, during polling of handsets in steps (732) to (735), if the talk key (132) is pressed on the polled handset, the handset (in this case, the handset (IC)) Station (2)
It is connected to the circuit (3A) through the terminal, and it is possible to make a telephone call in response to an incoming call.

On the other hand, at time t1, a command signal CMNO indicating an incoming call is sent by designating the handset (LA) as the representative handset.
If the handset controller (LA) does not send the command signal CMND for incoming call response within the period Tt (the connection sequence is shown in Figure 6), the microcontroller (24) The processing of step (716)
From step (717) through step (718
) and waits for a period T3, and the end point of this period T is 1. The command signal CM NO to ring the ringer is not transmitted until then.

and therefore a general effective handset (IB).

(IC), etc., cannot receive the ringer's command CM NO by time t5, so the microcomputer (1
The process of step 40) includes steps (822) and (
823) and enters the sleep mode of the standby mode in the control channel from the reception mode.

Then, at the base station (2), the next available handset, in this case a handsera) (1
B) Designate wo as the new representative hand cent and step (
711) To perform subsequent processing, the routine (800) is executed again from step (801) in a valid handset.

If there is an incoming call from an outside line, a ringer will sound on all active handsets and if you press the talk key (132), the talk key (132) will ring.
The first handset polled after pressing
You can make a call in response to the incoming call.

[Extension call]

This is a call between any two handsets (IA) to (IH), and is performed as follows.

That is, for example, when the handset (IA) is in standby mode, the auxiliary keys (133) to (137)
Press the extension key (133), then press the number key on the dial key (131) that corresponds to the handset number (this is equal to the handset identification code H3ID) to which you wish to make an extension call. system (wholesale code CTRL is the key (133) ~ (
137) was pressed, the pressed key was the extension key (133), the dial key (131), the pressed numeric key (the other party's handset identification code HDIS), and the A command signal CMNO indicating the handset identification code H5ID of C! is formed, and this command signal C! , (N D are transmitted to the base station (2) by the FM signal Su on the uplink control channel.

For example, if the base unit (21A) is vacant, the command signal CM NO is taken out from the receiving circuit (220) of this base unit (21A), and is received in response to a request for an extension call from the handset (one person). After that, the handset (IA) and base unit (21A) are connected in the same way as when making a call.
A communication channel will be opened between them.

Furthermore, in the base station (2), a vacant base unit and a vacant communication channel are selected by the microcomputer 24). For example, if the base unit (21B) is vacant, this base unit (21B) The FM signal Sd of the command signal CM NO is transmitted through the downlink control channel. However, at this time, the command signal CM N
The control code CTIIIL in O is data indicating that the call is an extension call, the handset identification code H3ID of the party with whom the handset (LA) desires to make an extension call, and the channel number of the call channel.

Then, the FM signal Sd of this command signal CMNO is
When the call is received by the handset of the other party desired by the handset (IA), for example, the handset (IH), a bell will sound from the speaker (139) of the handset (IH), and the other party will receive the call from the handset (IH). When you press the talk key (131), the handset (IH)
A communication channel is opened between the base unit and the base unit (21B).

In addition, since the base station (2) is an extension call, the switch circuit (22) is controlled by the microcomputer (24).
are controlled and the transmitting circuit (210> and receiving circuit (220>) of the base unit (21A) are connected to the base unit (21B) through the switch circuit (22).
It is connected to a receiving circuit (220) and a transmitting circuit (210).

Therefore, the handset (IA) is connected to the handset (IH) through the base station [2],
Thereafter, you can make an extension call between Handsef (LA) and (IH).

Then, end the call and handset) (IA>, (
For example, when the handset (LA) presses the talk key (131), the handset (18) and base unit (2LA) end the call in the same way as when ending a call with an outside line. They go into standby mode. Also, the base unit (21B)
to the handset (IH), the control code CTRL indicates the end of the call, and the handset (IH) identification code H
Command signal C indicating 3ID! A N D is sent, handset (IH) and base unit) (21B)
However, after the end of the call process, these devices also go into standby mode.

[Other operations]

Similar protocols can also be used to transfer an outside line from one handset to another, to make a royal call between an outside line and two handsets, or to ring all remaining handsets from one handset. .

H Effects of the Invention As described above, according to the present invention, it is possible to make a simultaneous call to a plurality of handsets. In this case, especially according to this invention, when making a simultaneous call to a plurality of handsets, , selects a representative handset and calls multiple handsets, waits for a response from the representative handset, and if there is no response, selects a representative handset again, performs the same process, and receives a response from the representative handset. If there is a valid handset, we poll multiple handsets and open a call channel to the handset that responds to the poll, so if there is a valid handset, as in the case of method Channels can be opened in a short time without requiring as much as 20 seconds. Moreover, the control channel is then only used as specified.

Furthermore, as in the case of the method (2), there is no possibility that a plurality of handsets simultaneously respond to a simultaneous call, causing interference, and therefore the channel can be reliably opened.

Furthermore, even if there is a handset that cannot open a channel, as in the case of method (2), the processing does not stop due to access to that handset.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the present invention, and FIGS. 2 to 10 are diagrams for explaining the same. (IA) to (IH) are handsets, (2) is a base station, (110) and (210) are transmitting circuits, and (120) and (220) are receiving circuits. Representative Person I Fujisada Domatsu Hide Kuma Mori name number 7-Ma, 7th Fig. 2 V: υ flat sequence> Fig. 3 1A-1H Handset 2 Base station kimiireknayat No. Figure 10

Claims (1)

[Claims] When a plurality of slave units and a base unit are used in combination, and when a communication channel is opened between the slave unit and the base unit, a control channel is transmitted from the base unit to the slave unit. data specifying the call channel is transmitted through the MCA, and the call channel is opened between the slave unit and the base unit based on the transmitted data.
When the above-mentioned base unit makes a simultaneous call to the above-mentioned handsets, it selects one of the above-mentioned handsets as a representative, and sends data indicating the handset selected as the representative and data indicating the simultaneous call. is transmitted through the above control channel, and if no response is received from the handset selected as the representative, one of the remaining handsets is selected as the representative, and the above process is repeated, and the handset selected as the representative When you get a response from
The cordless telephone is configured such that the base unit polls the plurality of slave units and opens the communication channel with the slave units that respond to the polling.