JPS5835414B2 - Intermittent reception method for mobile radio equipment - Google Patents

Abstract

PURPOSE:To reduce power consumption during a waiting state as to a moving body communication system which transmits a call signal including a start signal and control signal at constant intervals from a base station. CONSTITUTION:A radio signal inputted to receiving input terminal 17 of a receiver is detected by reception part 18 and led to start signal detector 19 and call signal detector 21 respectively. Start signal detector 19 detects start positions of respective words in the call signal sent from a base station periodically and control part 25 is informed of the detection of each start signal. On the basis of this information, control part 25 operates immediately timer 26 driven by quartz oscillator 27. The output of reception part 18, on the other hand, is supplied to signal detector 21 as well and when detector 21 judges that its own station is called, control part 25 enters into the operation of a connection with the base station while subordinate power switch 32 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to reduce power consumption during standby of a mobile radio in a mobile communication system in which a base station sends out a calling signal and a broadcast signal, including a start signal and a control signal, respectively, at regular intervals. The present invention relates to an intermittent reception method for reducing the amount of noise.

When a mobile radio device is mounted on a vehicle in a mobile communication system, a battery with a relatively large capacity can be used as a power source for the mobile radio device.

However, for example, it is difficult to use a power source with a large capacity for a portable mobile radio device.

From this point of view, since batteries of small capacity are used, methods have been proposed to reduce the power consumption as much as possible.

One such method is to operate the receiver intermittently to significantly reduce power consumption during periods of non-operation.

That is, when a base station sends a paging signal to a mobile radio, for example, the mobile radio is called by the last digit of its own station number.

-G9 into 10 groups; these groups G.

-G, and time slot S as shown in FIG. 1A, respectively.

-89 are allocated in advance, and only the group corresponding to the period of each time slot is called.

If the mobile radio belongs to group G2, the mobile radio connects the receiver power only during the time slot to which it belongs, i.e., the time slot S2 for group G2, as shown in FIG. The power shall be turned off during this time.

In this way, the power consumption of the mobile radio device can be reduced compared to when the power supply is always connected. However, with this conventional intermittent reception method, when a call occurs from a person connected to the base station, Since the call operation is not performed until the time slot for the mobile radio comes,
The connection time is increased, the call line is inefficiently used, and the base station requires a device to store previous calls so that they can occur during that time slot period. There were drawbacks such as:

In other words, it was necessary to change the configuration of the base station to enable intermittent reception.

The purpose of this invention is to make it possible to reduce power consumption during standby by simply changing the mobile station without making any changes to existing base stations that were designed without considering intermittent reception. It is an object of the present invention to provide an intermittent reception method for a mobile radio device that can shorten the time required for connection and increase the efficiency of using a calling line.

According to the present invention, a start signal is detected among signals such as a calling signal and a broadcast signal transmitted from a base station at a fixed period, and the detection drives a timer, and the control signal and own station that follow the start signal are detected. The numbers are detected sequentially.

If the detected control signal does not indicate a paging signal, or if the subsequent mobile station number is not the own number even if it indicates a paging signal, the receiver power is turned off.

Thereafter, the timer predicts the time when the next call signal, broadcast signal, etc. will be received, and the receiver power is turned on at least immediately before the control signal is received.

In this way, the base station only needs to perform transmission similar to the conventional transmission method for calling and broadcasting signals, and mobile radios automatically turn on and off, consuming less power than if they were always on. is reduced.

FIG. 2 shows an example of the code structure of a signal sent from a base station to a mobile station, including start signals 11. Consisting of a control signal 12 and an information signal 13, the start signal 11 indicates the starting point of the code, followed by the control signal 12,
The control signal 12 is a signal for distinguishing whether the content of the information signal 13 that follows is a calling signal for a mobile station or a broadcast signal such as position information indicating the type of base station.

When the control signal 12 indicates a calling signal, the information signal 13 has a mobile station number encoded therein, and when the control signal 12 indicates a broadcast signal, it has encoded position information.

In the code structure shown in Figure 2, if 14 is a call signal and 15 is a broadcast signal, examples of transmission from these base stations are as shown in Figure 3. become.

That is, the broadcast signal 15 is continuously sent out at all times,
A paging signal 14 is sent out only when a paging for a mobile station occurs.

The structure of the code transmitted from this base station is the same as that generally transmitted by existing base stations.

The broadcast signal 15 and the calling signals 14, 15 are transmitted at regular intervals.

When the base station does not send out a paging signal, a broadcast signal is sent out, and its content is always constant.

In other words, there is no need to constantly receive broadcast signals and decipher their contents.

Therefore, the average power consumption of the mobile radio device can be reduced by causing the receiver to operate intermittently so as to turn off the receiver's power while transmitting a broadcast signal.

For example, in response to the transmission from a base station as shown in FIG.
As shown in Figure B, the receiver power supply of the mobile radio device is controlled on and off.

That is, while the start signal 11 and control signal 12 in the code sent from the base station are being transmitted, the receiver power is turned on, the start signal 11 and the control signal 12 are always received, and the content of the control signal 12 is When the content of the control signal 12 indicates a broadcast signal, the power of the receiver is turned off, and when the content of the control signal 12 indicates a calling signal, the receiver receives the information signal 13 sent out subsequently. The receiver is then turned on and decodes the mobile station number to determine whether the receiver is being called.

When the control signal 12 indicates a paging signal and the following information signal 13 encodes a mobile station number, the mobile station can
In some cases, it can be clearly determined that the call is not for the own station, and in such cases there is no need to receive subsequent mobile station numbers; in other words, by turning off the receiver power while receiving the mobile station number, , it becomes possible to further reduce power consumption.

Here, the determination of the own station number is performed as follows.

Generally, signals transmitted over mobile radio sections may be misinterpreted due to fading or the like.

Therefore, with emphasis on the error correction code, n bits (n is 1
3) errors can be corrected.

Therefore, when determining whether the number is the local station number, it is necessary to determine that the local station is not being called only if the number differs by one or more n bins, which is impossible to correct.

FIG. 5 shows an embodiment of the intermittent reception system according to the present invention, showing only the parts necessary for this intermittent reception operation.

Receiver input terminal 17 is connected to receiver 18 and receiver 1
The output side of 8 is connected to each input side of a start signal detector 19 and a calling signal detector 21.

The start detection terminal 22 and control detection terminal 23 of the start signal detector 19, and the call signal detector 21
The output terminal 24 of is connected to the control section 25.

The control unit 25 is connected to a timer 26, and the timer 26 is supplied with an oscillation signal from a crystal oscillator 27, and operates based on this signal.

The power supply 28 is connected to each operating power supply terminal of the control unit 25, timer 26, and crystal oscillator 27 through a main power switch 29.

The power supply 28 is also connected to one end of a power rise detector 31 and a sub power switch 32 through a main power switch 29, respectively.

The output side of the power supply rise detector 31 is connected to the control section 25 .

The other end of the sub power switch 32 is connected to each operating power terminal of the receiver 18 and detectors 19 and 21.

The control terminal 33 for the sub power switch 32 is connected to the control unit 25
connected to.

The operation of the configuration shown as δ in FIG. 5 will be explained with reference to the flowchart shown in FIG.

The start of operation of the device is initiated by turning on the main power switch 29.

That is, close the power switch 29 and turn on the power rise detector 31.
When it is detected that the power supply voltage applied to each part has reached a normal value, the control part 25 is initialized by the output.

The control unit 25 has a built-in microcomputer, for example, and performs the following operations by reading, decoding and executing programs.

The control unit 25 closes the sub power switch 32 in step R1.

Therefore, the receiver 18. The start signal detector 19 and the calling signal detector 21 are supplied with a power supply of 5 yyn to operate.

The wireless signal input to the receiver input terminal 17 is sent to the receiver 18
The signal is detected and guided to the start signal detector 19 and the calling signal detector 21.

The start signal detector 19 detects the start position of each word from signals such as calling signals and broadcast signals periodically sent from the base station (step R2).
, the detection of the start signal is reported to the control section 25.

Based on this information, the control unit 25 immediately starts the crystal oscillator 27.
Activate the timer 26 driven by (step R2
).

For example, the start signal detector 19 sequentially reads input signals into a shift register, and extracts a second signal from the contents of the shift register.
The start signal in the figure is detected by an AND circuit.

When this is detected, the content of the control signal 12 following that start signal 11 in the shift register at that time is supplied to the decoder.

This decoder determines whether the received signal is a calling signal (step R4), and the result is supplied to the control section 25.

The output of the receiver 18 is also supplied to a calling signal detector 21, and the calling signal detector 21 can use a configuration similar to a conventional one, and detects whether the received signal differs from the own station number by n bin 1 or more. (Step R5), error correction is performed (Step R6), and it is determined whether the local station is being called (Step R7).

If it is determined that the base station is the own station, the control unit 25 keeps the sub power switch 32 closed (step R8), enters the normal reception state, and moves on to the connection operation with the base station (step R9).

Start signal 11 was detected, but control signal 1
2 is not a calling signal, or the detector 2
If it is determined that the number is not the own number in step R1o, the control unit 25 turns off the sub power switch 32 (step R1o).
), the receiver 18 is stationary.

Further, the timer 26 determines whether a predetermined period of time has elapsed (step R01), thereby predicting the arrival of the next start signal, and turning on the width power switch 32 again just before the arrival time. R1), receiver 18.
Power is applied to the start signal detector 19 and the calling signal detector 21, and the process returns to the above-mentioned state.

The period of the start signal 11 is several hundred milliseconds, and when only the broadcast signal is being transmitted, the sub power switch 32 is turned on only for a period slightly longer than the period of the start signal 11 and control signal 12, and is turned on for the other periods. is off, and the consumption of the power supply 28 is reduced accordingly.

Moreover, since the start signal 11 is transmitted at short, constant cycles, there is no risk of delay in connection of a call from the base station.

Furthermore, the existing base station can be used as is, and no changes are required to the base station.

After turning on the main power switch 29, start signal 1
1 is detected, from next time onwards, the timer 26 predicts the time when the next start signal will arrive and the sub power switch 32 is activated.
is turned on, but if the timer 26 has high accuracy, once the start signal is detected, the sub power switch 3 is turned on immediately before the next control signal 12 as shown in FIG. 4C.
2 can be turned on to further reduce power consumption.

In this case, in order to ensure the detection of the first start signal, when a predetermined plurality of start signals are detected in succession, the sub power switch 32 is turned on immediately before the next control signal 12. You can also do it.

It is also possible to calibrate the timer 26 to the timing of the start signal from the base station by manually or automatically turning on the main power switch 29 at appropriate intervals, or by detecting the start signal 12 through a program operation.

As explained above, according to the intermittent reception method of the present invention, when a calling signal is sent at a fixed cycle,
As soon as it is determined that the own station is not being called, the power to the receiver is turned off, so power consumption can be reduced during that time.

In addition, since the number of groups is , etc., the base station can achieve this by improving the circuit of the mobile device without taking special consideration.
The effect is even more effective.

[Brief explanation of drawings]

Fig. 1 is a time chart showing the relationship between the base station transmission power source and the power on/off state to explain the conventional intermittent reception method, Fig. 2 is a diagram showing an example of the code structure of the base station transmission radio wave, and Fig. 3 4 is a time chart showing an example of the radio waves transmitted from the base station, FIG. 4 is a time chart showing an example of the relationship between the radio waves transmitted from the base station and the on/off state of the power supply in the intermittent reception method of the present invention, and FIG. 5 is the time chart according to the present invention. A block diagram showing an example of the intermittent reception method, and FIG. 6 is an operation flowchart thereof. 11: NIST signal, 12: control signal, 13:
Information signal, 14: Call signal, 15: Broadcast signal, 18
: Receiver, 19 NIST signal detector, 21: Call signal detector, 25: Control unit, 26: Timer 27: Crystal oscillator, 29: Power switch, 31: Power rise detector, 32: Sub-power switch.

Claims (1)

[Claims] 1 A call signal consisting of a start signal, a control signal, and an information signal or a broadcast signal consisting of a start signal, a control signal, and an information signal is sent from a base station at a fixed period, and the above broadcast signal is sent out for other than the above call signal. In a mobile communication system in which a mobile radio device detects the above-mentioned calling signal or a start signal in a broadcast signal, the detection output drives a timer, and the control signal and own station number following the above-mentioned start signal are sequentially transmitted. means for detecting, and means for turning off the power of the receiver when the control signal does not indicate a calling signal, or when the following mobile station number is not the own number even if the control signal indicates the calling signal; An intermittent reception system for a mobile radio, comprising means for anticipating the time at which a next calling signal and broadcast signal will be received and turning on the receiver power at least immediately before the control signal is received.