JPH0927782A - Wireless device - Google Patents

Abstract

(57) [Summary] [Purpose] The receiving side performs intermittent reception to reduce power consumption. [Structure] A radio unit 12 including a receiving unit for demodulating received data from an electric wave received by an antenna 11, and the radio unit 1
2, a power supply control unit 14 that controls the supply of the power supply 13 to the power supply ON / OFF, a first timer 15 that sets an ON / OFF interval in the power supply control unit 14, and an ON time that is longer than the setting time of the first timer 15. Second timer 1 set to long
6, and controls each part of the device, and from the first timer 15 to the second timer when a carrier is detected from the received data.
The control unit 20 switches to the timer 17 and monitors the received data for a longer time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device used for management of vending machines, meter reading of electricity and gas, and the like.

[0002]

2. Description of the Related Art Conventionally, a wireless device of this type, particularly a mobile wireless device, is always supplied with power and is in a receiving state, so that data on the transmitting side can be reliably received. . On the other hand, a technique for performing intermittent reception by turning the power on and off has been put to practical use in cordless telephones and the like so that the power consumption of the power supply may be small.

[0003]

However, in the conventional wireless device used for management of vending machines, meter reading of electricity and gas, etc., data on the transmitting side and the data on the receiving side cannot be synchronized. There is a problem that intermittent reception, which is an effective means for suppressing the above, cannot be performed. In particular, when performing communication while moving and performing data collection and various controls, it is difficult to perform intermittent reception because the communication time is limited.

The present invention solves such a conventional problem, and an object of the present invention is to provide a radio apparatus capable of performing intermittent reception and reducing power consumption.

[0005]

In order to achieve the above object, the first structure of the present invention includes a radio section having a receiving section for demodulating received data from a radio wave received by an antenna, and to this radio section. A power control unit for controlling on / off of the power supply of the power source, and a first power setting unit for setting an on / off interval in the power control unit
And a second timer whose on-time is set longer than the set time of the first timer, and controls each part of the device, and when the carrier is detected from the received data, the second timer changes from the first timer. Switch to the timer of
And a control unit for monitoring the received data for a longer time.

According to a second aspect of the present invention, the transmitting-side wireless device is provided with a transmission-dedicated device for continuously transmitting the intermittent reception synchronization signal at the frequency f1 and a transceiver for transmitting / receiving at the frequency f2, and receiving. When the side wireless device receives the intermittent reception synchronization signal from the transmission side transmission dedicated device at the frequency f1 to establish synchronization, and when a carrier is detected, a transceiver that communicates with the transmission side transceiver at the frequency f2 is used. Be prepared.

[0007]

According to the first aspect of the present invention, a first timer for setting an ON / OFF interval for intermittent reception and a second timer having an ON interval longer than the first timer, which operates after carrier detection, are provided. By providing the timer of (1), once the carrier is detected, the receiving operation is continuously performed for the period of the second timer, and the transmission data of the next transmitting side can always be synchronized, which is consumed due to the intermittent reception. The power can be reduced.

According to the second aspect of the present invention, the transmitter / receiver on the receiving side performs carrier detection while synchronizing with the intermittent reception synchronizing signal of the frequency f1 transmitted from the transmitting-side transmission dedicated device. When the carrier is detected, communication is performed with the transmitter / receiver at the frequency f2 for the first time, so that synchronization can be achieved even if the off time is long during intermittent reception, and power consumption can be significantly reduced.

[0009]

【Example】

(Embodiment 1) FIG. 1 shows the configuration of a first embodiment of the present invention. In FIG. 1, 11 is an antenna, 12 is a wireless unit including a transmitter and a receiver for performing wireless transmission and reception,
13 is a power supply, 14 is a power supply to the wireless unit 12 is turned on,
A power control unit for controlling off, a first timer 15 for setting an on / off interval in the power control unit 14, a second timer 16 for setting an on time longer than a set time of the first timer 15, Reference numeral 17 is a memory storing a control program and the like, 18 is a buzzer, 19 is an alarm control unit for controlling the buzzer 18, 20 is each unit of the apparatus, and when the carrier is detected from the received data, the first timer 15 is used. The control unit switches to the second timer 16 and monitors the received data for a longer time.

Next, the operation of the above embodiment will be described with reference to FIG. On the transmitting side, transmission is performed at time T1,
Reception is performed at time T2 (> T1). On the other hand, on the receiving side, the first timer circuit 15 causes the time T3 (<
During T1), the power is turned on and carrier sense is performed.
During (> T2), the power supply is turned off and the operation is paused. When the carrier is detected, the second timer circuit 16 causes
The power is turned on for a time (T1 + T2 + T3) longer than the data transmission interval (T1 + T2) on the transmission side.

The wireless unit 12 controls the power source 1 by the power source control circuit 14 at the intervals set by the first timer 15.
The radio wave input from the antenna 11 is demodulated and transmitted to the CPU 20 while the 3 is controlled to be turned on and off. CPU 20
Is in a standby state in a normal state, controls the power supply control circuit 14 only when an interrupt signal from the first timer circuit 15 is input, and connects the power supply 13 to the wireless unit 12 to check whether or not there is a carrier. If there is no carrier as a result of the carrier sense, the power supply control circuit 14 is controlled to stop the power supply to the wireless unit 12, and
It also puts itself in a standby state to reduce power consumption. CPU
When 20 operates and it is determined that there is a carrier, the second timer circuit 16 is operated and the received data is constantly monitored during that time. By doing so, even if the bit synchronization and frame synchronization signals on the transmission side cannot be received and the data cannot be captured completely, the second timer circuit 16 always stands up and receives data only during the operating time. Since the data is monitored, the next time data is sent from the sending side, synchronization can be ensured and normal reception can be performed.

In addition, the CPU 20 controls the alarm control unit 19 and sounds the buzzer 18 in synchronization with transmission and reception, so that the user is operating normally when the user collects data while moving in a car. You can know if you are driving, and if something is wrong, stop the car or slow down and take the necessary measures to take prompt action.

In the above embodiment, a series of receiving operation programs are stored in the memory 17 and executed, and the CPU 20 can be handled by using a one-chip CPU. Similarly, the first timer circuit 15 and the second timer circuit 16 can be incorporated in the CPU 20 or can be realized by using an LSI in which only both of them are accommodated in one package. A speaker or a vibrator may be used instead of the buzzer 18.

(Embodiment 2) FIG. 3 shows a second embodiment of the present invention, which is a format of a transmission message sent from the wireless device on the transmission side to the wireless device shown in the first embodiment. The example of (a) and the sequence (b) of transmission / reception is shown. The transmission message sent from the wireless device on the transmission side at the time of carrier sense includes the same number of times as the conventional method, that is, the bit synchronization 31, the frame synchronization 32, the call name 33, and the transmission command 36, the number of times of reception 34 and the received ID number 35. It consists of information.

When there are a plurality of wireless devices on the receiving side and a response is returned to the data on the transmitting side, the Aloha method is often used. However, when a plurality of received terminals send responses, there is always a probability that data will collide with each other. In order to reduce this, as shown in FIG. 3B, when the receiver of the ID number and the response of
By notifying that the reception with the number was successful by including it in the transmission message, these receivers do not have to return the response again to indicate that the reception was possible, and the receiver with the ID number responds. There is no collision when returning.

As described above, according to this embodiment, by inserting the ID number of the previously received receiving wireless device into the transmission data of the transmitting wireless device at the time of carrier sense, the receiving wireless device that has received the ID number is received. Then, it can be seen that the transmission was normally performed, and it is not necessary to retransmit the data for confirmation, and the number of collisions between the receiving side wireless devices can be reduced.

(Third Embodiment) FIG. 4 shows the configuration of a third embodiment of the present invention. In FIG. 4, reference numeral 41 is a receiving-side wireless device, which is composed of a transceiver 42 having a transmitting / receiving unit, and 43 is its antenna. Reference numeral 44 denotes a transmitting-side wireless device, which includes a transmission-dedicated device 46 having an antenna 45 and a transceiver 48 having an antenna 47. The transmission-side wireless device 44 continuously transmits the intermittent reception synchronization signal of frequency f1 by using the transmission-dedicated device 46 so as to synchronize with the intermittent reception of the reception-side wireless device 41. In the receiving-side wireless device 41, the carrier sense is first performed at the frequency f1.
Then, the transceiver 42 is operated intermittently. When the receiver-side transceiver 42 carries out carrier sensing with the transmission data of the frequency f1, the response frequency is set to f2, and the response data is returned to the transmitter-side wireless device 44. Since the transmitter / receiver 48 is on standby at the frequency f2, the transmitter wireless device 44 can receive the response from the receiver transceiver 42.

As described above, according to the present embodiment, even if the OFF interval at the time of intermittent reception is long, the synchronization can always be obtained, so that the power consumption can be greatly reduced and a system with low power consumption can be made. it can. In addition, the receiving side has almost no need to measure the sending timing, and the probability that the responses on the receiving side collide decreases. In this embodiment, the transmission-side wireless device 44 has a transmission-only device 44 and a transceiver 48.
Although they are configured separately, it goes without saying that they may be combined into one.

[0019]

As is apparent from the above embodiment, the present invention has the following effects. (1) A wireless device with low power consumption can be realized by realizing the intermittent reception operation. (2) By alerting with a buzzer or the like in synchronization with transmission and reception, the usage status can be immediately known when the radio wave is being used in another system. For example, even when driving an automobile, it is possible to immediately know whether or not the vehicle is synchronized, so that necessary measures can be taken immediately. (3) At the time of carrier sense, by inserting the ID number of the receiving-side wireless device that the transmitting-side wireless device was able to receive into the transmission data, it is possible to prevent the receiving-side wireless device having the same ID number from transmitting again. And the transmission efficiency is improved. In particular, compared to the case of returning a response indicating that reception was possible as in the past, since it is inserted in the send command,
Transmission efficiency is significantly improved. (4) The transmission side is provided with a transmission-dedicated device for synchronization in intermittent reception and a transmitter / receiver used for actual communication, and by dividing the respective frequencies, synchronization at the reception side during intermittent reception is ensured. As a result, the reliability of the data is improved, and the pause interval can be set longer, so that the power consumption can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a wireless device according to a first embodiment of the present invention.

FIG. 2 is a timing chart of a transmission / reception operation in the first embodiment.

FIG. 3A is a data configuration diagram of a transmission message according to the second embodiment of the present invention. FIG. 3B is a transmission / reception sequence diagram according to the second embodiment of the present invention.

FIG. 4 is a schematic system configuration diagram of a wireless device according to a third embodiment of the present invention.

[Explanation of symbols]

 11 antenna 12 wireless unit 13 power supply 14 power supply control circuit 15 first timer circuit 16 second timer circuit 17 memory 18 buzzer 19 alarm control unit 20 CPU 31 bit synchronization 32 frame synchronization 33 call name 34 number of times received 35 received ID number 36 Transmission command 41 Receiving side wireless device 42 Transceiver 43 Antenna 44 Transmitting side wireless device 45 Antenna 46 Special transmission device 47 Antenna 48 Transceiver

Claims (4)

[Claims] 1. A wireless unit having a receiving unit for demodulating received data from a radio wave received by an antenna, a power control unit for controlling ON / OFF of power supply to the wireless unit, and an ON state in the power control unit. , A first timer for setting an off interval, a second timer for which an on time is set longer than a set time of the timer, and each unit of the device are controlled, and when a carrier is detected from the received data, A wireless device, comprising: a controller that switches from the first timer to a second timer and monitors received data for a longer time. 2. The wireless device according to claim 1, further comprising an alarm device that operates in synchronization with transmission and reception. 3. The ID number of the receiving side wireless device indicating that the response from the receiving side wireless device has been normally received is inserted into the transmission data sent from the transmitting side wireless device to the receiving side wireless device during carrier sense. The wireless device according to claim 1, wherein the response from the receiving wireless device to the transmitting wireless device is omitted. 4. The transmission-side wireless device continuously transmits an intermittent reception synchronization signal at a frequency f1, and a transmission dedicated device, and a frequency f2.
And a transmitter / receiver for performing transmission / reception, the receiving-side wireless device synchronizes by receiving the intermittent reception synchronization signal from the transmitting-side transmission-dedicated device at the frequency f1, and when the carrier is detected, the frequency f2 is set. A wireless device comprising a transmitter / receiver for communicating with the transmitter / receiver.