JPS5832813B2 - Kobetsu Sentakuyobidashijiyushinki - Google Patents

Abstract

PURPOSE:To make a reduction of power consumption possible by turning off the power supply periodically regardless of whether or not these is a radio carrier wave.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiver in a wireless individual paging system that selectively calls using radio, and in particular a receiver in which the power supply is periodically interrupted during standby in order to reduce power consumption. Regarding the receiver.

Wireless selective receivers (hereinafter referred to as receivers), such as so-called "pagers" that simply receive individual calls using radio, generally only receive calls several times a day.
It is necessary to keep the device connected to the power source all day long.

Therefore, the receiver's power supply is periodically turned into a liquid state, and the power supply is kept connected only when there is a possibility of a call, allowing it to receive individual call signals and extending the life of the battery built into the receiver. There are ways to do this.

In other words, a radio frequency carrier wave is sent out only when making a call on the transmitting side, and when the receiver receives the carrier wave when the power is connected, this is detected by the squelch circuit and the power is connected. Hold.

In this method, it is necessary to control the transmission output of the base station transmitter, which has relatively high power, and during busy times when calls are concentrated, the ringing signal is sent out continuously, so the carrier wave of the base station transmitter is continuous. Even receivers that have not received a call are continuously kept connected to the power supply, so in such a case, there is a drawback that power consumption cannot be reduced.

Conventionally, the paging signals assigned to each receiver are divided into multiple groups, the paging signal transmission time for each group is fixed, the paging signal transmission interval for each group is fixed, and the paging signals assigned to each receiver are divided into multiple groups. A timer device etc. is used to turn on the power at a cycle that is longer than the signal transmission time and approximately equal to the transmission interval of the group, and the power is connected only while transmission is being carried out to the group to which the corresponding receiver belongs to reduce consumption of the receiver. Power consumption can be reduced.

However, with this method, the individual paging signal cannot be received while the timing at which the sending signal and the power supply of the receiver are connected is different.

Another drawback is that the transmission time for one group is fixed, and it cannot respond to differences or fluctuations in the call traffic of each group.

An object of the present invention is to provide an individual selective call receiver that periodically converts the power source into a liquid state, eliminates the need for the transmitter's transmission output to be in a liquid state, and reduces power consumption regardless of the presence or absence of a radio carrier wave. .

Another object of the present invention is to provide an individual selective calling receiver with reduced power consumption that can receive an individual selective calling signal of a group when the group signal to which the receiver belongs is transmitted. It is in.

Yet another object of the present invention is that the number of calls that can be called within one group can be made variable, allowing flexibility in accordance with differences and fluctuations in call traffic between each group. An object of the present invention is to provide an individual selective call receiver.

According to the present invention, in the standby state, the power supply to at least the radio receiving circuit is interrupted at a cycle shorter than the length of the group signal by the control of the intermittent timer.

A group signal is selected from the call signal selection circuit to which the output of the radio receiving circuit is supplied, and when the group call detection timer detects that this continues for a predetermined time or more, the bistable circuit is set by this output.

The set output of this bistable circuit is controlled to continuously supply power to the receiver.

After all required calls for that group are completed, the bistable circuit is reset and the receiver returns to the standby state.

Note that the base station divides the receivers into groups, and after transmitting a group signal common to that group for a longer period than the intermittent cycle of the receiver's power supply, it sequentially transmits paging signals to the receivers in that group that have a call request at that time. do.

When the group signal is also transmitted for a short time each time the ringing signal is transmitted, the receiver must ensure that the group signal is not received for a predetermined period of time that is longer than the transmission time of the ringing signal to one receiver. This is detected by a call end detection timer, and the bistable circuit is reset by the output of the call end detection timer, so that it is possible to easily detect the end of calls in a group regardless of the number of calls in that group.

After the group signal is detected, the bistable circuit can be reset by detecting a time corresponding to the maximum number of calls in one group call using a call end detection timer.

Next, a detailed explanation of the present invention will be given with reference to the drawings.

FIG. 1 shows an example of a group of receivers, with individual calling numbers oooo assigned to each receiver.

Divide 100,000 of ~99999 into 10 groups of 10,000 each in order of magnitude, and use the most significant digit, that is, the 5th digit, of the individual call number of each group as the group number, and therefore the 0th Group No. 9 to Group No. 9.

Each group contains 10000 individual calling numbers,
Each individual calling number consists of five decimal digits, and the highest digit of the individual numbers included in each group is equal to its group number.

FIG. 2 shows an example of a time chart of a paging signal sent from a base station transmitter.

FIG. 2C shows the configuration of the individual calling signal, in which selection signals td'f corresponding to the respective decimal numbers of the individual calling number are transmitted in order from the high-order individual calling number for a certain period of time.

In this example, the subscriber number consists of five digits, so five selection signals D1 from the first to fifth digits are used as individual calling signals.
~D5 are transmitted for a fixed period of time td.

As the selection signal, for example, an audio frequency signal of a different frequency is made to correspond to each of the decimal numbers O to 9.

FIG. 2B shows a time chart for sending out a calling signal for one group. First, a selection signal corresponding to the group number mentioned above is sent out as a group signal Sg for a certain period of time tg.

Thereafter, the individual calling signal S1. S2...
...Sn is sent out sequentially.

As mentioned earlier, the group number is the same as the most significant digit of the individual numbers belonging to that group, so for example, in the case of the 0th group, a selection signal corresponding to 0'' is sent as the group signal S2, and then Each subsequent individual call signal S1
. . . At the beginning of each Sn, a selection signal S corresponding to “0” is sent out.

When the group signal S2 corresponding to "0" is sent out, all the receivers of the No. 0 group that received it keep their power connected, and enter the standby state for receiving the individual call signals S1 to Sn. .

Subsequently, the required number of individual paging signals for the 0th group are sent out.

Among the receivers that first received the group signal S 1 of number 0, the receiver that takes the sent individual paging signal as its individual paging number selectively receives it and emits a paging audio frequency tone.

In this way, when the transmission of the individual paging signal for one group is finished, the signal transmission is stopped or the transmission of the paging signal for another group is started, and the receivers of the previous group, for example, group 0, The individual signal standby state is canceled and the group signal standby state returns to the group signal standby state in which the power supply is periodically traversed.

FIG. 2A shows an example of the transmission of the transmission signal, and each group G
.

-09 consists of a group signal S and subsequent n individual call signals S1 to Sn, as shown in FIG. 2B.

Each group is sent out sequentially, but it is also possible that the number n of individual ringing signals sent out by each group is different.

It is also possible to vary the number n of individual paging signals for one group each time the group is transmitted.

Furthermore, it is possible to have a pause between each group, and it is also possible to omit sending to a given group if there are no calls at all.

The sending order of the groups may also be changed each time the group is sent, if necessary.

The receiver according to the invention allows for the construction of individual ringing signals with great flexibility as described above.

FIG. 3 shows an example of an individual selective calling receiver according to the present invention, in which a signal received from an antenna 1 is amplified and detected by a radio receiving circuit 2 and then supplied to a selection circuit 3.

If the received individual paging signal matches the individual paging signal of the receiver, the selection circuit 3 outputs the paging signal generation circuit 16.
Start.

The selection circuit 3 is, for example, the radio reception circuit 2 as shown in FIG.
The outputs of are supplied to bandpass P-wave devices F1 to F5 that select the first to fifth digit selection signals D1 to D5, respectively, and
1 to F4 are supplied to the AND circuit A1 through delay circuits T1 to T4 each having a delay time of 4td-td, and the output of the t-wave generator F5 is also directly supplied to this circuit A1.

When all outputs are obtained from the wave transmitters F1 to F5, that is, when the received individual calling signal matches the individual calling signal of its own receiver, an output is obtained from the AND circuit A1, and this is the output from the calling signal generating circuit 16. supplied to

The calling signal generation circuit 16 generates an audio frequency signal alarm for calling and supplies it to the speaker 4, and the speaker 4 emits an audible sound for calling.

A battery 5 serving as a power source for the receiver is connected to each power terminal of the radio receiving circuit 2 and the selection circuit 3 through a gate circuit 6.

On the other hand, this power supply 5 is directly connected to the gate circuit 6, the power supply switching circuit 7, and the calling signal generation circuit 16 without passing through the gate circuit 6, so that these circuits 6, 7, and 16 are always in an operable state.

If power is constantly applied to the call signal generation circuit 16, the call will be made and an audible sound will be emitted, but this sound will continue even if the receiver enters the standby state. This is so that the emission of audio frequency sound can be stopped by operating the reset button.

A disconnection timer 8 is provided for connecting and disconnecting the power supply corresponding to the receiving circuit 2 and the selection circuit 3 in the standby state.

This timer 8 is set to ON for a certain period of time as shown in FIG. 4B.
A signal P1 of logic "1" is periodically outputted for a certain period of time tOF, and a logic "0" is periodically outputted for a certain period of time tOF.

The timer 8 is composed of, for example, a ring counter, counts the clock from the oscillator 11, and obtains Pl as its output.

This output is supplied to the gate circuit 6 through the OR circuit 14.

The output of the power supply switching circuit 7 is logic for the gate circuit 6.
■” (Hereinafter, logic “1” is 1”, logic “Opy” is 01
1 respectively.

), power is supplied from the battery 5 to the receiving section 20 (the radio receiving circuit 2 and the selection circuit 3 are collectively referred to), and the
'', the application of power to the receiving section 20 is stopped.

When the selection signal corresponding to the group number is received from the selection circuit 3, that is, when an output is obtained from the t-wave device F in Fig. 1, the output from this to the power supply switching circuit I becomes 1M, and in other cases is 0.

When the receiver is in the group signal standby state, the inputs other than the input from the intermittent timer 8 of the OR circuit 14 are N Oj+
and the gate circuit 6 is t.

It receives an input of "1" during N and an input of "0" during tOF.

Therefore, the receiving section 20 receives t. During tOF, power is applied and the device is in a state where it can receive data, and during tOF, the power is turned off and the device is in a dormant state.

Now, a transmission signal as shown in FIG. 4A is sent out from time t1, and a group signal Sg of the group number to which the receiver belongs
is received during the next toN after time t1, the selection circuit 3 outputs 1'' to the power supply switching circuit 7 at the time t2 as shown in FIG. 4C.

In the power supply switching circuit 7, the input from the selection circuit 3 is supplied to an OR circuit 14, and the power supply of the receiving section 20 is kept close while the group signal Sg is being received.

The input from the selection circuit 3 is also supplied to a group call detection timer 9.

This timer 9 is composed of, for example, a counter, and the input is '
When it becomes ``1'', the clock of the oscillator 11 starts counting, and the input continues to be 61'' for a certain period of time taO, and as shown in the fourth diagram, the 7-lip flop 13 as a bistable circuit outputs the pulse P2. Set.

When the flip-flop 13 is set, its output is
1'', which is passed through the OR circuit 14 to the gate circuit 6.
supplied to

Therefore, the power of the receiving section 20 is kept close until the flip-flop 13 is reset.

Through the above-described operations, the receiving section 20 maintains its power and enters the individual paging signal receiving state.

Sending time tg of group signal Sg and intermittent power supply time t
The following relationship is established between ON, tOF, and the time ta for detecting the group signal.

In this way, during the transmission of the group signal Sg, the power of the receiving section 20 is connected at least once during tg, and the group signal is continuously received for taO, the power is maintained, and the individual paging signal is 51S2・
. . . It is possible to enter the standby state of Sn.

In addition, the one-digit transmission time td of the individual calling signal and the above ta
give the relationship between

Even if by chance a selection signal equal to the own group signal among the individual calling signals Sn in another group is received at the time when the power is connected to the toN, the output from the selection circuit 30 circuit 7 side is 1 u.
Therefore, the group call detection timer 9 starts operating.

However, before the timer 9 outputs the output, the reception of the selection signal ends and the output of the selection circuit 3 changes from "1" to 0, so the timer 9 stops operating and the flip-flop 13
Since tON is never set, there is no risk that the power will be turned off and the individual signal reception state will be entered when the tON time ends.

On the other hand, if the individual calling signal is a consecutive number such as 33333, the selection signal corresponding to the number "3" is
There is a possibility that the signal is continuously transmitted for a period of several digits and detected as a group signal of the third group.

Therefore, in this case, if the same selection signal is repeated using a selection signal "Rn" with a frequency different from the selection signal corresponding to the decimal number, "R91" is sent instead of the next number, and for example, the above Sends 3R3R3 instead of 333330.

Further, a reset time of td is provided between individual paging signals that are sequentially sent out.

Therefore, one selection signal within an individual paging signal will not last for t times or more, and the same selection signal will not continue for t or more times between adjacent individual paging signals.

When the group signal S2 is received as described above, the power of all the receivers belonging to the group is necessarily maintained, and these receivers change from the standby state for receiving the group signal to the standby state for receiving the individual paging signal. Enter the receiving state.

On the other hand, the standby state for individual paging signals will not be erroneously entered due to the individual paging signals of other groups.

As mentioned above, if the flip-flop 13 is set to n191, the power supply remains connected even after the group signal ends.

Therefore, the receiver receives a group signal S followed by an individual paging signal S.
0 to Sn starts, and when an individual ringing signal corresponding to the receiver number is received, the selection circuit 3 activates the ringing signal generation circuit 16, and the speaker 4 generates a ringing tone.

The power switching circuit 70 input from the selection circuit 3 is also supplied to the call end detection timer 10 via the inverter 12.

Therefore, when the input to the power switching circuit 7 from the selection circuit 3 becomes O'', the timer 10 starts counting the clocks from the oscillator 11.

Now, it is assumed that the transmission time of one individual call signal is tc, and the timer 10 outputs an output when the input from the inverter 12 is continuously tbO for "1", and is reset when the input becomes "0". Give another relationship.

As mentioned above, the group signal Sg is equal to the selection signal of the first digit of the individual paging signal of the group.

Therefore, as shown in FIG. 4C, the power supply switching circuit 70 input from the selection circuit 3 outputs "121" at least once in tc, as shown as P2, for example, while receiving the selection signal of its own group. .

Therefore, the timer 10 is reset at least once to tc, and 1'' is not output as the output of the timer 10 while receiving the individual paging signals S1 to Sn, as shown in FIG. 4E.

When the transmission of the individual paging signals S1 to Sn of that group is finished, the transmission of the group signal S of the next group or the suspension of the transmission signal begins.

The selection circuit 3 no longer receives the selection signal corresponding to the group number of its own group, and the input from the selection circuit 3 to the power supply switching circuit 7 becomes "O'' from time t4 (FIG. 4C), and the timer 10 outputs 1''' to the flip-flop 13 after a certain period of time tbO from time t4, as shown in FIG. 4E.

Flip-flop 13 is reset by this signal,
Its output becomes 0''.

Therefore, the output of the power switching circuit I is controlled by the intermittent timer 8 as shown in FIG.
The power supply of 0 is periodically turned off, and the state returns to the group signal standby state.

The above operation is possible regardless of the number of individual paging signals sent to the own group.

Sending time tg of group signal S and call end detection timer 1
If the relationship between timer time tb and timer time tb of 0 is given, even if the transmission of the group signal of another group is started immediately after the transmission of the individual paging signal of the own group is finished, the transmission of the individual paging signal of the next group will be delayed. timer 10
As a result, the flip-flop 13 is reset, and even if there is a selection signal corresponding to the own group signal among the individual signals of the next group, the flip-flop 13 must return to the periodic liquid state of the power supply before that. I can do it.

Based on the above, the state of power connection when waiting to receive a call signal is 1
Regardless of the number of individual ringing signals in the group, the group signal standby can reliably return to the periodic state of the power supply.

The rate of reduction in power consumption in the receiver of the present invention that operates as described above is as follows.

First, in the group signal standby state, the connection between tOH,
Since tOF is repeatedly disconnected, the average current 'mo of the receiver is given by ioN, the current consumption of the receiver when the receiver is connected to the power supply, and ioF, the current consumption when the power supply is disconnected.

Since i 0 N "'> i 0 F is clear, the second term on the right side of the above equation is positive, and the relationship imo>ioN holds true, confirming that the current consumption, that is, the power consumption, can be reduced. It was done.

Next, let us consider a case where there is a lot of paging traffic, and the selective paging signals for each group, including the own group, are sent out intermittently (and the sending time for each group is equal).

In this case, the average current of 1 ml is the number of groups.

Then, it becomes , and since , it is clear that the current consumption, that is, the power consumption is reduced in this case as well.

Another embodiment of the receiver according to the present invention is shown in FIG. 5, in which parts corresponding to those in FIG. 3 are given the same reference numerals.

That is, the case is the same as that shown in FIG. 3, except that the call end detection timer 10 is controlled by the seven outputs of the seven lip-flop 13, and the timer time is selected as the longest time te required for one call to one group. It is.

Therefore, the operation from the periodic power supply liquid cylinder state of waiting for a group signal to the state of waiting for an individual call signal, from when the 7 lip 70 knob 13 is sent and the power is maintained, to entering the state of waiting for an individual call signal, is the same as that of the previous embodiment. I will omit the explanation.

In this embodiment, the timer 10 is a flip-flop 1
When 3 becomes '1' and the power of the receiving section 20 is held close, the operation starts.

Thereafter, after a certain period of time te, the timer 10 outputs N 111, and the reset terminal of the flip-flop 13 receives N I I
+ is applied, and the flip-flop 13 is reset.

After that, the output of the OR circuit 14, that is, the output of the power supply switching circuit 7, is controlled by the intermittent timer 8, and the power supply of the receiving section 20 is periodically controlled at t.

The state returns to the state of contact between N and disconnection between tOF and tOF.

A time chart of the operation of this receiver is shown in FIG. 6, corresponding to FIG. 4.

■Group sending time tf and timer time t of timer 10
e, so that all individual calling signals within the group can be received.

Also, the number n of individual calling numbers in one group is You can freely choose within.

In this second embodiment, the power is always held when the group signal Sg is received, and is reset after a certain period of time, so that the group signal of the next group is activated immediately after the individual paging signal transmission of one group is completed. Even if transmission of a group signal is performed, or even if the transmission of a group signal of the next group starts after a pause of an arbitrary period, reception operation is possible without adversely affecting the receivers of the previous group. .

As described above, by using the receiver of the present invention, there is no need for a liquid cylinder for the transmission output of the base station transmitter, and the power consumption of the receiver is reduced regardless of the presence or absence of a radio carrier wave.

Furthermore, since the power supply for a part of the receiver is switched on at a cycle shorter than the group signal transmission time, when the group signal of the group to which the receiver belongs is transmitted, the power supply for a part of the receiver is activated at least once within the transmission time. The receiver power is connected,
By detecting a group signal and holding the power supply, it is possible to send out an individual paging signal for its own group, and immediately enter a standby state for an individual paging signal.

Furthermore, the receiver operates correctly even if the time during which one group of transmission signals is blanked, the number of groups, the order in which transmission signals are sent to groups, etc. are changed in response to differences and fluctuations in call traffic within each group. Therefore, it becomes possible to use a system with a very high degree of freedom as an individual selection radio paging system.

The power on/off control may be performed only on the radio receiving circuit 2.

Control of the power supply by the bistable circuit 13 and control of the power supply by the intermittent timer 8 may be performed by separate circuits.

The selection circuit 3 is not limited to the one shown in FIG. 7, and may be configured to change the selection signal that can be received next each time a selection signal is received, depending on the number assigned to the receiver.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of dividing individual calling numbers into groups, FIG. 2 is a diagram showing an example of the configuration of a transmission signal, and FIG. 3 is a block diagram showing a first embodiment of a receiver according to the present invention. Figure 4 is a time chart showing the operation of the main parts, Figure 5
FIG. 6 is a block diagram showing a second embodiment of the receiver according to the present invention, FIG. 6 is a time chart showing the operation of its main parts, and FIG. 1 is a block diagram showing an example of a selection circuit. 2: Radio reception circuit, 3: Selection circuit, 5: Power supply, 6: Gate circuit, 8: Intermittent timer, 9 Nigel loop call detection timer,
10: Call end detection timer, 13: Bistable circuit.

Claims (1)

[Claims] 1. The length tc of the individual calling signal is the length tg of the group signal.
The individual paging signal is shorter and consists of a plurality of serial selection signals, the first selection signal of which is the same as the group signal, and a serial signal consisting of the group signal and at least one of the individual paging signals. a radio receiving circuit that receives and demodulates a modulated radio carrier wave; a first means for intermittently supplying power to at least the radio receiving circuit at a cycle shorter than the length tg of the group signal; and the radio receiving circuit. a selection circuit connected to said group signal, said first selection signal and said individual call signal to generate first, second and third detection signals, respectively; a bistable circuit that is set by continuing for a first predetermined time longer than the selection signal and reset after a second predetermined time tb longer than the length tc of the individual call signal has elapsed from the last second detection signal; and a second means for generating an alarm in response to the third detection signal, and in response to the first detection signal, the second detection signal, and the output signal in the set of the bistable circuit, respectively. and third means for changing the intermittent supply of power to the wireless receiving circuit to a continuous supply while those signals are being obtained. 2 The length tc of the individual calling signal is the length t of the group signal
g, and the individual paging signal is composed of a plurality of selection signals in series, the first selection signal of which is the same as the group signal, and the serial signal is composed of the group signal and at least one of the individual paging signals. a radio receiving circuit that receives and demodulates a radio carrier wave modulated by the group signal; a first means for intermittently supplying power to at least the radio receiving circuit at a cycle shorter than the length tg of the group signal; connected to the circuit, said group signal, said first
a selection circuit that generates first, second, and third detection signals in response to the selection signal and the individual paging signal; and the first detection signal continues for a first predetermined time longer than each of the selection signals. a bistable circuit that is set by the first detection signal and reset after a second predetermined time period longer than a predetermined length of a plurality of individual calling signals has elapsed from the first detection signal; a second means for generating an alarm; and in response to the first detection signal, the second detection signal, and the output signal in the set of the bistable circuit, respectively, while those signals are being obtained. and third means for changing the state of intermittent supply of power to the wireless receiving circuit to a continuous state of supply of power.