JPH0758933B2 - Wireless receiver - Google Patents

Description

The present invention relates to a wireless receiver that receives a signal that is periodically transmitted to its own station at a predetermined time interval, and a transmission signal is addressed to its own station due to electric field deterioration due to fading or bit errors. Even if it is not normally detected, the power is controlled to be turned off to reduce power consumption, and information that is periodically transmitted to the local station is received at a predetermined time interval. In a wireless receiver, a receiving unit that receives the information, a power supply that supplies power to the receiving unit, a power control unit that controls the power to be turned off, and an abnormality detection that detects an abnormality in an output signal of the receiving unit. Section, while determining the information addressed to its own station from the output of the receiving section,
When the detection result of the electric field detection unit is recognized and it is determined that the information is addressed to the own station, or when the received signal is abnormal, the power supply control unit is controlled to perform the off control. And a station information judging section.

[Industrial application field]

The present invention relates to a wireless receiver that receives information that is periodically transmitted to its own station at predetermined time intervals.

2. Description of the Related Art In recent years, a mobile radio receiver, such as a car phone or a pager, which can be mounted in a vehicle or is portable, has been used to receive a signal transmitted from a base station or a new station.

For example, in a car telephone, one line is used by a plurality of subscribers, and a master station has a fixed period for a radio receiver installed in a car of each subscriber who uses the same line. In order, the call enable / disable signal (a signal indicating whether the line is available, that is, a call is possible), and an incoming call signal (a signal indicating that there is an incoming call from another subscriber) Send. These signals include the destination (slave station number) of each subscriber, and the wireless receiver of each subscriber determines the destination (slave station number) and determines that the signal is addressed to itself. For example, the processing according to the content of the signal is performed.

Now, in such a wireless receiver, there is a demand to reduce the power consumption of the receiver in order to suppress the power consumption as much as possible, and the power of the receiver is also controlled to be turned off at an appropriate timing. .

By the way, in a vehicle or a portable wireless device, since the antenna cannot be installed at a high position due to its nature, it is susceptible to propagation obstacles such as fading, and a technique for reducing power consumption under such adverse conditions is demanded. It was

[Prior art and problems to be solved by the invention]

FIG. 7 shows an example of a conventional radio receiver.

In the configuration of FIG. 7, 1 is the receiving unit, 4 is the power source of the receiving unit 1, 7 is the destination of the transmission signal from the master station received by the receiving unit 1, and it is determined whether or not the information is that of the own station. The station information determination unit 5 is a power supply control unit that controls the power supply 4 of the reception unit 1 to be turned on / off under the control of the station information determination unit 7, and the station information processing unit 6 determines that the station information determination unit 7 is own station information. At this time, the processing according to the content of the above-mentioned transmission signal is performed.

FIG. 8 is a flowchart showing the procedure of the operation of the wireless receiver shown in FIG. This operation will be described below with reference to the timing chart of FIG.

First, the master station transmitter sequentially transmits slave station information (transmission signal) to the receivers of slave stations (for example, wireless receivers of subscribers of car telephones) that use the same line at regular intervals. To do. FIG. 9 shows a case where the master station sequentially transmits slave station information (transmission signal) to each of the three slave stations and.

Therefore, for the slave station, of the slave station information (transmission signal) addressed to itself, the slave station information is transmitted for a predetermined time (for example, the 9th time).
For the slave station in the figure, the master station is repeatedly transmitted at intervals of (the time when the master station transmits slave station information for the other two slave stations).

In the slave station (for example, the slave station), after receiving by the receiving unit 1 (step 61 in FIG. 8), in the station information determining unit 7, the destination information included in the slave station information is the own station (for example, the slave station). Only when it is determined to indicate (step 62), the power supply control unit 5 is controlled and a predetermined time until the time when the slave station information addressed to the own station (for example, slave station) should be transmitted next time In the middle, the power supply 4 supplied to the receiving unit 1 of the own station is controlled to be off, and the receiving unit 1 is put in the inoperative state (step 63). Then, after the elapse of the predetermined time, the power supply control unit 5 turns on the power supply 4 again and puts the receiving unit 1 in the operating state (step 64).

However, in the conventional radio receiver as described above,
If for some reason the station information determination unit 7 cannot detect the destination information addressed to its own station in the transmission signal from the master station, the station information determination unit 7 continues until it can determine that the information is addressed to its own station. Then, the transmission signal from the master station is repeatedly identified, and the power source 4 cannot be turned off during this period.

For example, as shown in FIG. 9, there is an abnormality in the output signal of the receiving unit 1 due to fading or the like, and the electric field level of the received signal from the master station decreases due to, for example, electric field deterioration, and falls below the level required to recognize the destination or the like. , The slave station cannot determine whether it is addressed to itself. Alternatively, it may not be possible to determine whether or not it is addressed to the own station due to a bit error in the signal.

That is, at time t ₁ in FIG. 9, for example, the electric field level of the received signal is equal to or higher than the level necessary for recognizing the destination or the like, so the station information determination unit 7 of the slave station determines that the signal addressed to itself is the same. Although it was recognized, at time t ₂ , the electric field level of the received signal was lower than the level required for recognizing the destination, etc., so at time t ₃ , the signal received at the own station at the previous time (time t ₁ ) was received. Even if the power source 4 of the receiving unit 1 is turned on after a predetermined time has elapsed, the station information determination unit 7 of the slave station cannot recognize the signal addressed to itself. Therefore, the station information determination unit 7
Continuously repeats the determination of the transmission signal from the master station until it can determine that the information is addressed to its own station, during which the power supply 4 cannot be turned off.

That is, when the electric field level of the received signal decreases due to electric field deterioration such as fading or bit error, the station information determination unit 7 cannot recognize the information addressed to the own station, and therefore, until the next destination information normally received can be received. There is a problem that the power supply cannot be controlled to be turned off, and thus power consumption cannot be reduced.

The present invention has been made in view of the above problems, and in a wireless receiver that receives a transmission signal that is periodically transmitted to its own station at a predetermined time interval, the reception signal is abnormal due to an abnormality in the reception signal such as fading. It is an object of the present invention to provide a wireless receiver capable of reducing power consumption by performing power-off control even if it is not normally detected that the device is addressed to itself.

[Means for Solving the Problems]

FIG. 1 is a basic configuration diagram of the present invention. In this figure, 1
Is a receiving unit, 4 is a power supply, 5 is a power supply control unit, and 6 is a station information processing unit, and these configurations are the same as the configurations shown in FIG.

Further, in the configuration of FIG. 1, 2 is an abnormality detection unit and 3 is a station information determination unit.

The abnormality detection unit 2 is newly provided according to the present invention, and detects the output of the reception unit 1, that is, the abnormality of the received signal.

Further, unlike the station information determination unit 7 of FIG. 5 described above, the station information determination unit 3 in the configuration of FIG. 1 simply recognizes that the signal transmitted from the output of the reception unit 1 is the information addressed to itself. In addition to controlling the power supply control unit 5 to perform the off control, the power supply control unit 5 is also controlled when the detection result of the abnormality detection unit 2 is recognized and an abnormality occurs in the received signal. To perform the off control.

[Action]

When the station information determination unit 3 recognizes the detection result of the abnormality detection unit 2 and an abnormality occurs in the received signal, the station information determination unit 3 controls the power supply control unit 5 without recognizing the information addressed to the own station from the output of the reception unit 1. Then, the power supply 4 of the receiver 1 is turned off for a predetermined time.

Therefore, even if it is not normally detected that the transmission signal is addressed to the own station due to the electric field deterioration due to fading or the like, or the bit error, it is possible to control the power off to reduce the power consumption.

〔Example〕

 Embodiments of the wireless receiver according to the present invention will be described below.

FIG. 2 is a diagram showing a schematic configuration of the first embodiment of the wireless receiver of the present invention shown in FIG. In this embodiment, the electric field level of the received signal is detected.

In FIG. 2, the configuration of the wireless receiver corresponding to the configuration of FIG. 1 is connected to the terminal 9 (for example, a mobile phone), and the portion corresponding to the station information processing unit 6 in the configuration of FIG. Is shown as the terminal control unit 8.

FIG. 3 shows the procedure of the operation of such an embodiment of the present invention.

First, the electric field level of the received signal is detected by the electric field detector 2 (step 32) at the same time when the signal is received by the receiver 1 (step 31 in FIG. 3), while the child information indicated by the received signal is detected by the station information judger 3. It is checked whether the station information is for its own station (step 33). Here, if it is recognized that it is addressed to the own station, the power is turned off for a predetermined time as in the conventional case, but if it is not recognized that it is addressed to the own station, the level of the electric field detected in step 32 is equal to or less than the reference value. Is checked (step 34). Here, if it is less than or equal to the reference value, the station information determination unit 3 regards the received signal as a signal addressed to a slave station of the own station, determines the same, and outputs the same control output as when it is determined to be the own station. 5, the power supply 4 of the receiver 1 is turned off for a predetermined time.

It is assumed that the station information determination unit 3 records the slave station number and the reference value as the station information.

Also, the terminal control unit 8 controls the terminal 9 according to the content of the slave station information received by the receiving unit 1 only when the station information determining unit 3 recognizes that the station is addressed to itself.

Further, FIG. 4 is a timing chart of the configuration of the above-described embodiment of the present invention.

At time t ₁ in FIG. 4, the electric field level of the received signal is equal to or higher than the level necessary for recognizing the destination, etc.
The station information determination unit 7 of the slave station can recognize the signal addressed to itself.
This is the same as the case of FIG. 9 described above.

Then, since the time t ₂ field level of the received signal is reduced below the level necessary to recognize the destination or the like, at time t _3, the reception of the receiving apparatus of the signal of the previous (time t ₁₎ Even if the power source 4 of the receiving unit 1 is turned on after a predetermined time has elapsed, the station information determination unit 7 of the slave station cannot recognize the signal addressed to itself. However, according to the present invention,
The station information determination unit 7 determines whether the electric field level of the received signal detected by the electric field detection unit 21 is below a predetermined reference value. As shown in FIG. 4, at this time, the electric field level of the received signal is lower than the predetermined reference value, so that the station information determination unit 7 controls the power supply in the same manner as when the signal addressed to the own station is received. The unit 5 is controlled to turn off the power supply 4 of the receiving unit 1 for the predetermined time. Thereafter, the predetermined time even at the time t ₄ when passed, the same operation as in the time t ₃ is performed.

Thus, even if the slave station information is not detected due to the electric field deterioration, the unnecessary power supply can be cut off at a predetermined time interval.

Next, FIG. 5 is a diagram showing a schematic configuration of the second embodiment.
In the first embodiment, instead of the electric field level detector 21 for detecting the electric field level of the received signal, a bit error detector for the received signal is provided.
It has 22.

In the second embodiment, if the slave station information received by the station information determination unit 3 is recognized as addressed to the self station, the power is turned off for a predetermined time as in the first embodiment.

Also, if the signal is received after the power is turned on after a predetermined time, but it is not possible to determine that it is the own station information, if it is determined that a bit error has occurred in that signal, it is recognized that it is addressed to the own station. Similarly, the power is turned off for a predetermined time. The timing chart of this embodiment is shown in FIG. As shown in the figure, the power is turned off for a predetermined time even when a bit error occurs. Therefore, even if it is not determined to be addressed to the own station, the power supply can be controlled to be turned off when an abnormality occurs in the received signal to reduce power consumption.

The present invention has been described above according to the embodiment, but the effect of the present invention becomes more effective if both the electric field level detection and the bit error detection are performed.

〔The invention's effect〕

According to the present invention, even if it is not normally detected that the transmission signal is addressed to its own station due to electric field deterioration due to fading or bit error, the following electric field deterioration can be detected by the electric field level of the received signal. The power can be turned off during the time until the information about the own station, and the power consumption can be reduced.

[Brief description of drawings]

1 is a basic configuration diagram of the present invention, FIG. 2 is a schematic configuration diagram of a first embodiment of the present invention, FIG. 3 is a diagram showing an operation procedure in the first embodiment of the present invention, and FIG. FIG. 5 is a timing diagram of the configuration of FIG. 2, FIG. 5 is a schematic configuration diagram of the second embodiment of the present invention, FIG. 6 is a timing diagram of the configuration of FIG. 5, and FIG. FIG. 8 is a configuration diagram of a wireless receiver, FIG. 8 is a diagram showing an operation procedure in the conventional wireless receiver, and FIG. 9 is a timing diagram of the conventional wireless receiver. [Explanation of Codes] 1 ... Reception unit, 2 ... Abnormality detection unit, 3,7 ... Station information determination unit, 4 ... Power supply, 5 ... Power supply control unit, 6 ... Station information processing unit, 8 ... … Terminal control unit, 9 …… Terminal.

Claims (3)

[Claims] 1. A radio which receives information periodically transmitted to its own station at a predetermined time interval, and when it is determined to be its own station, turns off the power until the next time it is transmitted to its own station. In the receiver, a receiving unit that receives the information, a power supply that supplies power to the receiving unit, an abnormality detecting unit that detects an abnormality in the output signal of the receiving unit, and an output signal of the receiving unit are A station information determination unit that detects whether or not it is addressed to a station, and when the station information determination unit determines that the output signal of the reception unit is addressed to the own station, or the station information determination unit outputs the output signal of the reception unit Is not addressed to the own station, and when the abnormality detection unit detects an abnormality in the output signal of the receiving unit, the power of the own station is turned off and the information is transmitted to the own station after a predetermined time. A wireless receiver comprising a power supply control unit for turning on the power supply. 2. The radio receiver according to claim 1, wherein the abnormality detection unit includes an electric field detection unit that detects an electric field level of an output signal of the reception unit, and the electric field detection unit detects the electric field level. A radio receiver characterized in that when the electric field level becomes equal to or lower than a predetermined reference value, the output signal of the receiving unit is determined to be abnormal. 3. The radio receiver according to claim 1, wherein the abnormality detection unit includes a bit error detection unit that detects a bit error of an output signal of the reception unit, and the abnormality detection unit includes the bit error detection unit. When a bit error is detected,
A wireless receiver characterized by determining an output signal of a receiving section as abnormal.