JPH08317442A - Radio receiver - Google Patents

Abstract

PURPOSE: To reduce the power consumption of an internal battery by controlling the intermittent driving of a reception part on the basis of the reception electric field intensity of transmission data transmitted from a radio base station. CONSTITUTION: This receiver is equipped with a reception part 11 which receives the transmission data, a discrimination means which discriminates the reception electric field intensity of the transmission data received from the reception part 11, and a reception control means which drives intermittently the reception part 11 on the basis of the reception electric field intensity of the transmission data discriminated by the discrimination means. In a paging receiver 1, the reception part 11 discriminates the reception electric field intensity of the transmission data transmitted by radio from a pager service company, and outputs a discriminated result to a decoder part 13 as an RSSI (envelope detection output) signal, and the decoder part 13 sets the intermittent driving mode of the reception part 11 corresponding to the reception electric field intensity of the transmission data on the basis of the RSSI signal inputted from the reception part 11, and drives the reception part 11 intermittently according to the intermittent driving mode. Therefore, it is possible to evade wasteful power consumption in the internal battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver, and more particularly to a radio receiver for controlling intermittent driving of a receiving section based on a received electric field strength of transmission data transmitted from a radio base station.

[0002]

2. Description of the Related Art Conventional data communication systems using telephone lines include a wireless paging system and a home banking system. Among them, the wireless paging system is based on a transmission data format such as POCSAG system. Wireless data communication is performed from the service company to the paging receiver.
This POCSAG (Post Office Code Standardization
The transmission data format of the Advisory Group) method will be described with reference to FIG.

FIG. 7A shows the overall format of transmission data, which is composed of a preamble signal A and a plurality of batches B, C ... The preamble signal A is a signal for bit synchronization between the transmission data and the receiver, and is a continuous pattern of "1" and "0" of "1010101 ..." Continued for 576 bits.

Further, FIG. 1B shows the format of each batch, which is composed of a sync code SC and eight frames from the first to the eighth, and one frame is composed of two codewords. Both the synchronization code SC and one codeword have a 32-bit structure, and the codeword is divided into an address codeword indicating a calling number and a message codeword indicating a message. An address codeword is shown in FIG. 7C, and a message codeword is shown in FIG.

The address codeword is a message flag for distinguishing whether the first bit is the address codeword or the message codeword. In the case of the address codeword, this bit is "0". The 2nd to 19th bits are bits representing address data, the 20th and 21st bits are function bits that can be used for designating a display form and a sound output form, and the 22nd to 31st bits are BCH parity bits for error correction. , The 32nd bit is an even parity bit indicating whether the total sum of the transmission bits is an even number or an odd number.

In the message code word, the first bit is a message flag and "1" indicating the message code word is set, the second to 21st bits are the message bits representing the message data, and the 22nd to 31st bits are the The BCH parity bit for error correction, the 32nd bit, is an even parity bit indicating whether the total sum of transmission bits is an even number or an odd number.

The synchronous codeword SC has a specific pattern of 32 bits. The PO described above
The transmission data of the CSAG system can selectively call a paging receiver (hereinafter also referred to as a pager) according to the address data of the address codeword and the order of the frame for transmitting the address codeword, and each pager can be called. To receive an individual call, 1
One address and one frame (for example, the second frame) are assigned, and the frame assigned to receive this individual call is the frame in which the address data assigned to the pager (self) is stored. For that reason, it is called a self frame.

Two addresses may be assigned as needed. In this case, one address is used for ordinary individual calling, and the other address is used for emergency calling and a plurality of pagers including the receiver. It is used to call a group consisting of

In addition to the address and the frame for receiving the individual call, the pager having a contract for the information providing service is provided with an address and a frame for receiving the information providing service (for example, a fifth frame). ) Is further allocated.

When message information is transmitted from the pager service company, an address codeword corresponding to the address data of the pager to be called is added at the beginning, and then a message having a length necessary for the message information to be transmitted is added. The codeword is sent. In addition,
Transmission is performed at a transmission speed of 62.5 ms per word (hereinafter referred to as 1 word time), and in order to reduce reception errors on the receiver side, the same contents (address and message) are sent for a predetermined time. Later, for example, 60 seconds later, the data is retransmitted.

In the pager which receives the transmission data wirelessly transmitted from the pager service company based on the transmission data format of the POCSAG system, as shown in FIG. 8B, the synchronization of the transmission data in each batch is performed. By intermittently driving the receiving unit at a timing corresponding to the code SC and the self frame (second frame), bit synchronization is performed on the transmission data based on the sync code SC for each batch, and then the self frame is obtained. Information is intermittently received, and it is determined whether or not there is a call to the pager by determining whether or not the self-frame information matches the address data assigned to the pager.

[0012]

However, such a conventional paging receiver has the following problems. That is, in the conventional paging receiver, when the POCSAG method transmission data wirelessly transmitted from the pager service company is intermittently received by the reception unit, the reception field strength of the transmission data is sufficiently strong and bit synchronization is performed for each batch. Even if it is possible to maintain a sufficient communication quality with respect to the transmission data without measuring the above, bit synchronization is performed on the transmission data based on the synchronization code SC for each batch as shown in FIG. 8B. Since the self-frame information was intermittently received after the measurement, there was a problem that the power of the internal battery was wasted and the battery life was shortened.

Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and by controlling the intermittent drive of the receiving unit based on the received electric field strength of the transmission data transmitted from the radio base station, It is an object to provide a wireless receiver which reduces power consumption.

[0014]

According to the first aspect of the present invention,
Receiving means for receiving the transmission data, discrimination means for discriminating the reception electric field strength of the transmission data received by the reception means, and the reception based on the reception electric field strength of the transmission data discriminated by the discrimination means. The above object is achieved by providing a reception control means for intermittently driving the means.

In this case, as described in claim 2, the receiving means receives the transmission data in the transmission data format composed of a plurality of batches preceded by a synchronization code, and the judging means receives the reception data. The reception control means determines whether the reception electric field strength of the transmission data received by the means is equal to or higher than a predetermined level, and the reception control means determines that the reception electric field strength of the transmission data is equal to or higher than a predetermined level. In such a case, it is effective to control the intermittent driving of the receiving means for the transmission data so as to be performed only at the timing corresponding to a predetermined frame in each batch after the synchronization is established.

Further, as described in claim 3, the receiving means receives the transmission data in a transmission data format composed of a plurality of batches led by a synchronization code, and the discriminating means is the receiving means. Determines whether the received electric field strength of the transmitted data received is above a predetermined level, and the reception control means judges that the received electric field strength of the transmitted data is above a predetermined level by the judging means. In the case where it is determined that the received electric field strength of the transmission data is not higher than a predetermined level,
It is effective to control so as to reduce the number of times of intermittent driving of the receiving means at the timing corresponding to the synchronization code in each batch of the transmission data.

[0017]

According to the invention described in claim 1, the discriminating means discriminates the reception electric field strength of the transmission data received by the receiving means, and the reception control means receives the transmission data discriminated by the discriminating means. The receiving means can be driven intermittently based on the electric field strength.

According to the second aspect of the invention, the discriminating means discriminates whether or not the received electric field strength of the transmission data received by the receiving means is equal to or higher than a predetermined level, and the reception control is performed. The means, when the determination means determines that the received electric field strength of the transmission data is equal to or higher than a predetermined level, intermittently drives the reception means with respect to the transmission data, after establishing synchronization, to a predetermined frame in each batch. It is possible to control so that it is performed only at the corresponding timing.

Further, according to the invention of claim 3, the judging means judges whether or not the received electric field strength of the transmission data received by the receiving means is equal to or higher than a predetermined level, and the reception control is performed. The means compares the received electric field strength of the transmission data with a predetermined level or more when compared with a case where the received electric field strength of the transmission data does not have a predetermined level or more. It is possible to perform control so that the number of times of intermittent driving of the receiving unit at the timing corresponding to the synchronization code in each batch of transmission data is reduced.

Therefore, by controlling the intermittent driving of the receiving unit for the transmission data based on the received electric field strength of the transmission data, it is possible to avoid unnecessary power consumption of the internal battery and to prolong the life of the internal battery. It becomes possible. As a result, the reliability of the wireless receiver can be improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 7 are diagrams showing an embodiment of a paging receiver to which the present invention is applied. First, the configuration of the present embodiment will be described based on the block diagram of the paging receiver to which the present invention is applied, shown in FIG. In this figure, a paging receiver (pager) 1 includes an antenna 10, a receiving unit 11, an ID-ROM 12, a decoder unit 13, SW14, SW15, a power supply 16, a display unit 17, and C.
PU 18, message memory 19, switch circuit 20,
Driver 21, speaker 22, driver 23 and LED
It is composed of 24.

The antenna 10 receives transmission data of the POCSAG system wirelessly transmitted from a pager service company (not shown) and outputs it to the reception unit 11. Receiver 11
The power supply from the power supply 16 is controlled by the SW 14 and SW 15, and the POCSAG transmission data input from the antenna 10 is detected and amplified and converted into digital data while the power supply is being performed. The received data is output to the decoder unit 13, and it is determined whether or not the received electric field intensity of the transmission data received by the antenna 10 is equal to or higher than a predetermined level.
RSSI determined by binary value of "i" or "Low"
(Envelope detection output) signal is output to the decoder unit 13.

At this time, when the receiving section 11 determines that the received electric field strength of the transmission data is above a predetermined level, the RSSI signal is set to "Hi" and the received electric field strength of the transmission data is predetermined. When it is determined that the level is not higher than the level, the RSSI signal is set to “Low” and output to the decoder unit 13.

The ID-ROM 12 stores self-frames, address data, etc. individually assigned to the pager 1, and based on an instruction from the decoder section 13,
The stored self frame, address data, etc. are output to the decoder unit 13.

The decoder unit 13 is operated by the user to switch SW1.
When 4 is switched to the ON state, the intermittent reception processing flow described later is executed, ON / OFF switching control of the SW 15 is performed, and the power supply to the receiving unit 11 is controlled to intermittently drive the receiving unit 11. Also, the decoder unit 13
By referring to the data stored in the ID-ROM 12, it is determined whether the self-frame information which is intermittently received by the receiving unit 11 and is input as the received data is the address data individually assigned to the pager 1. If the self frame information is address data individually assigned to the pager 1, C
The call detection signal is output to PU18 and SW15
To the receiving unit 11 to instruct to continue the ON state.
The data reception is continued and the message data addressed to the pager 1 is received. Then, the receiving unit 11
The received message data input from
Output to.

SW14 is turned ON / O by the operation of the user.
This is a manual switch for switching between FFs, and includes a power supply 16 to a CPU 18, a decoder unit 13, or a receiving unit 11.
The power supply to is switched ON / OFF. SW15
Is a switch that is turned on / off according to an instruction from the decoder unit 13, and turns on / off the power supply from the power source 16 to the receiving unit 11. Power source 16 is CP
It is a voltage source that supplies power to the U 18, the decoder unit 13, or the receiving unit 11. The display unit 17 is configured by a liquid crystal display or the like, and displays based on display data input from the CPU 18.

CPU (Central Processing Unit) 18
Controls each part of the pager 1 according to various control programs stored in a built-in ROM (Read Only Memory) (not shown). When a call detection signal is input from the decoder part 13, the driver 21 or An incoming call notification signal is output to the driver 23, and a notification sound is output from the speaker 22 or the LED 24 is blinked to notify the user of an incoming call and receive a message received from the decoder unit 13. The data is stored in the message memory 19.

When the switch circuit 20 instructs the CPU 18 to display the received message data,
The received message data is read from the message memory 19 and output to the display unit 17 for display. The message memory 19 forms a memory area for storing received message data input from the CPU 18.

The switch circuit 20 includes a switch such as a memory key, and outputs a switch input signal corresponding to the operated switch to the CPU 18. The driver 21 is C
A ringing signal is generated based on the incoming call notification signal input from the PU 18. The speaker 22 outputs a notification sound based on the sound signal input from the driver 21 to notify the user of an incoming call.

The driver 23 generates a blink pattern signal for blinking the LED 24 based on the incoming call notification signal input from the CPU 18. The LED 24 is the driver 2
Blinks based on the blinking pattern signal input from 3,
Notify the user of an incoming call. The above is the configuration of the paging receiver 1.

Next, the operation of this embodiment will be described. In addition,
In the present embodiment, the wireless data communication from the pager service company to the paging receiver 1 is performed by using P shown in FIG.
The following operation will be described assuming that the operation is performed based on the transmission data format of the OCSAG system. Also,
The description of the transmission data format of the POCSAG system is omitted because it has been described above.

First, the drive waveforms of SW14 and SW15 during the preamble search and the synchronization code search executed in the paging receiver of this embodiment will be described with reference to the timing chart shown in FIG. In the timing chart shown in FIG. 2, (a) shows transmission data of the POCSAG system wirelessly transmitted from the pager service company, and (b) shows the same.
The drive waveform of the SW 14 that is switched ON / OFF by the user is shown, and FIG. 7C shows the drive waveform of the SW 15 that is switch-controlled by the decoder unit 13.

In the decoder section 13, P shown in FIG.
When the user switches the SW 14 to the ON state and starts supplying power to the decoder unit 13 and the CPU 18 at the timing shown in (b) of FIG. By using the clock circuit (not shown) built in the decoder section 13, the SW15 is periodically switched to the ON state by 1 word time every 17 word times as shown in FIG. The power supply to the receiver 11 is controlled to intermittently drive the receiver 11.

Then, in the decoder section 13, it is judged whether or not the reception data demodulated by the receiving section 11 and inputted to the decoder section 13 while the power is being supplied is a preamble signal (preamble search). If the received data input from the receiving unit 11 is not a preamble signal, the receiving unit 11 is intermittently driven by successively switching the SW15 to the ON state by one word time every 17 word times. Continue the preamble search.

When the received data input from the receiving unit 11 is a preamble signal, the decoder unit 13
Instructs the SW 15 to continue the ON state, and subsequently determines whether the reception data demodulated by the receiving unit 11 and input to the decoder unit 13 is the synchronization code SC (synchronization code search ), The sync code SC located at the beginning of the first batch immediately after the preamble signal is detected.

Then, the decoder unit 13 outputs the synchronization code SC located at the beginning of the first batch immediately after the preamble signal.
When it detects that the POCSAG system transmission data wirelessly transmitted from the pager service company is bit-synchronized by switching the SW15 to the OFF state in synchronization with the end of the synchronization code SC, the transmission in the pager 1 is performed. Establish a data reception system.

The above is a description of the drive waveforms of SW14 and SW15 during the preamble search and the synchronization code search executed in the paging receiver 1 of the present embodiment.

Next, the drive waveform of the SW 15 during the intermittent reception process executed in the paging receiver 1 of this embodiment will be described with reference to the timing chart shown in FIG. In the pager 1 of the present embodiment, it is assumed that the address data assigned to the pager 1 to enable the individual call is assigned to the second frame, and the following description will be given. Do.

In the timing chart shown in FIG.
The figure (a) shows the transmission data of POCSAG system wirelessly transmitted from the pager service company, and the figure (b).
Shows a drive waveform of the SW 15 when the received electric field strength of the transmission data is not higher than a predetermined level, and FIG.
The drive waveform of SW15 when the received electric field intensity of the transmission data is equal to or higher than a predetermined level is shown.

The decoder unit 13 performs bit synchronization on the transmission data of the POCSAG system wirelessly transmitted from the pager service company by the above-mentioned preamble search and synchronization code search, and then on the transmission data, the pager concerned. In order for the receiving unit 11 to intermittently receive the second frame in which the address data assigned to 1 is stored, the clock circuit (not shown) built in the decoder unit 13 is used to turn on / off the SW 15.
The OFF switching control is performed to control the power supply to the receiving unit 11 to drive the receiving unit 11 intermittently.

At this time, in the decoder section 13, the receiving section 11
Based on the RSSI signal value input from
When the I signal value is “Low”, that is, when the received electric field strength of the transmission data is not higher than a predetermined level, in order to maintain the communication quality for the transmission data, FIG.
As shown in, by using the built-in clock circuit, the SW15 is switched to the ON state at a timing corresponding to the synchronization code SC located at the beginning of the batch and the second frame for each batch to intermittently drive the receiving unit 11. Thus, bit synchronization is performed on the transmission data for each batch, and self frame information is intermittently received.

The RSSI input from the receiver 11
When the signal value is "Hi", that is, when the received electric field strength of the transmission data is equal to or higher than a predetermined level, it is possible to maintain sufficient communication quality for the transmission data without performing bit synchronization for each batch. Therefore, the decoder unit 13
Using the built-in clock circuit as shown in FIG. 7C, the SW 15 is switched to the ON state at a timing corresponding to only the second frame for each batch, and the receiving unit 11 is intermittently driven, The self frame information is intermittently received. The above is the description of the drive waveform of the SW 15 during the intermittent reception process executed in the paging receiver 1 of the present embodiment.

Next, the intermittent drive mode setting process executed in the decoder section 13 of the pager 1 of this embodiment will be described with reference to the flowchart shown in FIG. 4 and the time chart shown in FIG. The intermittent drive mode setting process is a process of setting the intermittent drive mode of the receiving unit 11 according to the received electric field strength of the POCSAG method transmission data wirelessly transmitted from the pager service company. When the preamble signal is detected (step S1), the intermittent drive mode setting process is started.

First, the decoder unit 13 determines whether or not the RSSI signal input from the receiving unit 11 is "Hi" (step S2).

This RSSI signal is "Hi" or
This signal is determined by the binary value of "Low", and
In No. 1, when the received electric field strength of the received POCSAG transmission data is equal to or higher than a predetermined level, the RSS
If the I signal is "Hi", and if the received electric field strength of the transmission data is not higher than a predetermined level, then the RSSI
The signal is output as “Low” to the decoder unit 13.

If the received electric field strength of the transmission data is equal to or higher than the predetermined level, the predetermined level can maintain sufficient communication quality for the transmission data without bit synchronization for each batch. It is set to the received field strength level value.

Therefore, the decoder unit 13 is the receiving unit 1
When the RSSI signal input from 1 is “Hi”,
That is, when the received electric field strength of the transmission data is equal to or higher than a predetermined level, sufficient communication quality for the transmission data can be maintained without bit synchronization for each batch. As shown in the figure, the built-in clock circuit sets the intermittent drive mode for switching the SW 15 to the ON state at a timing corresponding to only the second frame for each batch (step S3), and the intermittent drive mode setting process ends.

In the decoder section 13, when the RSSI signal input from the receiving section 11 is not "Hi", that is, the RSSI signal is "Low" and the reception electric field strength of the transmission data is not higher than a predetermined level. In this case, in order to secure a sufficient communication quality for the transmission data, as shown in FIG. 3B, the synchronization code SC located at the beginning of each batch is set for each batch by the built-in clock circuit.
And SW15 is turned on at the timing corresponding to the second frame.
The intermittent drive mode for switching to the N state is set (step S4), and the intermittent drive mode setting process ends. More than,
It is an operation procedure of the intermittent drive mode setting process executed in the decoder unit 13 of the pager 1.

In the intermittent drive mode setting process,
The reception electric field strength of the transmission data is determined based on the RSSI signal input from the reception unit 11. When the reception electric field strength of the transmission data is equal to or higher than a predetermined level, bit synchronization for each batch is not performed at all, Only intermittent reception of the own frame is performed, and when the received electric field strength of the transmission data is not higher than a predetermined level, bit synchronization is performed for each batch and intermittent reception of the own frame is performed. This is not limited to the above-mentioned contents, in short, when the received electric field strength of the transmission data is compared with a case where the received electric field strength is equal to or higher than a predetermined level and when it is not equal to or higher than the predetermined level, The number of times the bit synchronization is performed at the time of intermittent reception of the own frame in the receiving unit 11 is reduced when the level is equal to or higher than the predetermined level. If configured to set the missing drive mode, including the example shown in FIG. 5, may be of any type.

Next, the intermittent reception processing executed in the decoder unit 13 of the pager 1 of this embodiment will be described with reference to the flowchart shown in FIG. 6 and the time charts shown in FIGS. 2 and 3 described above. . In the intermittent reception process, by controlling the power supply from the power supply unit 16 to the reception unit 11, the reception unit 11 is intermittently driven and the self-frame information included in the transmission data of the POCSAG system wirelessly transmitted from the pager service company. Is a process of intermittently receiving, and when the user turns on the SW 14 (step S10), the decoder unit 13 starts the intermittent receiving process.

First, the decoder unit 13 uses a built-in clock circuit for the POCSAG system transmission data wirelessly transmitted from the pager service company.
As shown in (c), the SW15 is periodically switched to the ON state by one word time every 17 word times to perform the preamble search (step S11).

Then, in the decoder section 13, the SW 15 is switched to the ON state and demodulated by the receiving section 11 during the period in which power is being supplied from the power source section to the receiving section 11,
It is determined whether or not the reception data input to the decoder unit 13 is a preamble signal (step S12). If the reception data input from the reception unit 11 is not a preamble signal, the process returns to step S11 and the preamble search is performed. continue.

If the received data input from the receiver 11 is a preamble signal, the decoder 13
Is the receiving unit 1 when performing the intermittent drive mode setting process flow described above to perform intermittent reception of self-frame information.
The intermittent drive mode 1 is set (step S1
3) for instructing the SW 15 to continue the ON state, and for determining whether the reception data subsequently demodulated by the receiving unit 11 and input to the decoder unit 13 is the synchronization code SC, A synchronous code search is performed (step S14).

Then, in the decoder section 13, the receiving section 11
It is determined whether or not the received data input from is the sync code SC (step S15). If the received data is not the sync code SC, the process returns to step S14 to continue the sync code search, and the received data Is the synchronization code SC, the SW15 is turned off in synchronization with the end of the synchronization code SC to perform bit synchronization with the POCSAG transmission data wirelessly transmitted from the pager service company. , The self-frame information is intermittently received by the intermittent drive mode set by the intermittent drive mode setting process flow executed in step S13, and the self-frame information is the address data individually assigned to the pager 1. See the data stored in the ID-ROM 12 To be confirmed (step S16).

Next, the decoder unit 13 determines whether or not a predetermined number or more of bit errors have occurred in the received self-frame information when the self-frame information is intermittently received in step S16. It is determined based on the BCH parity bit data and the even parity bit data of the information (step S17), and if the received self-frame information has a predetermined number or more of bit errors, the pager service company wirelessly transmits the information. It is determined that bit synchronization has not been accurately measured with respect to the transmission data, and the process returns to step S11 to perform the preamble search.

If no more than a predetermined number of bit errors have occurred in the received self-frame information, the process returns to step S16 and the intermittent reception of the self-frame information is continued. If the self-frame information is intermittently received in the intermittent driving mode of FIG. 3B, the sync code SC cannot be detected, and the process may return to step S11.

Then, in the intermittent reception process, when the user turns off the SW 14, an interrupt command for ending the intermittent reception process is input, and the intermittent reception process ends.

If it is determined in step S16 that the received self-frame information is the address data assigned to the pager 1, the incoming notification processing is executed and the self-frame information is transmitted after the self-frame. A message reception process for receiving message data addressed to the pager 1 is executed. The above is the operation procedure of the intermittent reception process executed in the decoder unit 13 of the pager 1.

In the operation procedure of the intermittent reception process,
When it is determined that a predetermined number or more of bit errors have occurred in the received self-frame information, the preamble search is performed again, but the self-frame information is intermittently received in the intermittent drive mode of FIG. 3C. If it is determined that a predetermined number or more of bit errors have occurred in the received self-frame information, the SW
Switch 15 to the ON state and perform a sync code search.
When the sync code SC is detected, the SW15 may be turned off in synchronization with the end of the sync code SC, so that the bit synchronization of the transmission data may be measured again. In this case, the intermittent drive mode setting process described above may be performed again.

As described above, in the paging receiver 1 of the present embodiment, the receiving section 11 determines the reception field strength of the POCSAG transmission data wirelessly transmitted from the pager service company, and the determination result is decoded as an RSSI signal. The decoder unit 13 outputs the signal to the unit 13, and based on the RSSI signal input from the receiver 11, sets the intermittent drive mode of the receiver 11 according to the received electric field strength of the transmission data and follows the intermittent drive mode. Receiver 1
1 can be driven intermittently.

Further, in the receiving section 11, it is judged whether or not the received electric field strength of the transmission data is above a predetermined level, and if it is judged that the received electric field strength of the transmission data is above a predetermined level, the RSSI If the signal is "Hi", and if it is determined that the received electric field strength of the transmission data is not above a predetermined level, the RSSI signal is set to "Lo".
When the RSSI signal is “Hi”, that is, when the RSSI signal is “Hi”, that is, the reception electric field strength of the transmission data is at a predetermined level based on the RSSI signal input from the reception unit 11. When the above is determined, the receiving unit 11 for the transmission data
It is possible to control the intermittent drive so that it is performed only at the timing corresponding to the own frame in each batch after the synchronization is established. Further, the receiving unit 11 determines whether or not the received electric field strength of the transmission data is equal to or higher than a predetermined level, and when the received electric field strength of the transmission data is determined to be equal to or higher than the predetermined level, the RSSI signal is set to " If the received electric field strength of the transmission data is not higher than a predetermined level, the RSSI signal is set to “Lo”.
When the RSSI signal is “Hi”, that is, when the RSSI signal is “Hi”, that is, the reception electric field strength of the transmission data is at a predetermined level based on the RSSI signal input from the reception unit 11. When it is determined that the above is the case, each of the transmission data is compared with the case where the RSSI signal is “Low”, that is, when the reception electric field strength of the transmission data is determined to be equal to or lower than a predetermined level. It is possible to perform control so that the number of times of intermittent driving of the receiving unit 11 at the timing corresponding to the synchronization code located at the beginning of the batch is reduced.

Therefore, by controlling the intermittent driving of the receiving section for the transmission data based on the received electric field strength of the transmission data, it is possible to avoid unnecessary power consumption of the internal battery and prolong the life of the internal battery. It becomes possible. Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and it is needless to say that the present invention can be appropriately modified without departing from the scope of the invention.

For example, in the paging receiver 1 of this embodiment, the intermittent reception processing flow for intermittently driving the receiving unit 11 in the decoder unit 13 is executed, and the SW 15 is turned on.
Although the ON / OFF switching control is performed, this is the CPU1
8, the intermittent reception process flow is executed, and SW15 O
The configuration may be such that N / OFF switching control is performed. However, in this case, the RSSI signal from the receiving unit 11 is the CPU
18 is output.

In this embodiment, the case where the present invention is applied to the paging receiver has been described. However, this is not limited to the paging receiver,
In short, any wireless receiver may be used as long as it controls the intermittent driving of the receiving unit based on the received electric field strength of the transmission data transmitted from the wireless base station.

[0065]

According to the first to third aspects of the present invention, wasteful power consumption of the internal battery is avoided by controlling the intermittent driving of the receiving unit for the transmission data based on the reception electric field strength of the transmission data. Therefore, the life of the internal battery can be extended. As a result, the reliability of the wireless receiver can be improved.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a paging receiver to which the present invention has been applied.

FIG. 2 is a timing chart of drive waveforms of SW14 and SW15 during a preamble search and a sync code search executed in the paging receiver of this embodiment.

FIG. 3 is a timing chart of drive waveforms of SW15 during intermittent reception processing executed in the paging receiver of this embodiment.

FIG. 4 is a decoder unit 13 of the paging receiver of this embodiment.
6 is a flowchart of an intermittent drive mode setting process executed in step S4.

FIG. 5 is an example of a timing chart of other drive waveforms of SW15 that can be executed during the intermittent reception process of the present embodiment.

FIG. 6 is a decoder unit 13 of the paging receiver of this embodiment.
6 is a flowchart of the intermittent reception process executed in step 1.

FIG. 7 is a diagram showing a transmission data format of the POCSAG system.

FIG. 8 is a timing chart of intermittent driving of a receiver executed in a conventional paging receiver.

[Explanation of symbols]

 1 Paging Receiver 10 Antenna 11 Receiver 12 ID-ROM 13 Decoder 14 SW 15 SW 16 Power 17 Display 17 CPU 19 Message Memory 20 Switch Circuit 21 Driver 22 Speaker 23 Driver 24 LED

Claims (3)

[Claims] 1. A reception means for receiving transmission data, a discrimination means for discriminating a reception electric field strength of the transmission data received by the reception means, and a reception electric field strength of the transmission data discriminated by the discrimination means. Based on the above, there is provided a reception control means for intermittently driving the reception means, and a radio receiver. 2. The receiving means receives transmission data in a transmission data format composed of a plurality of batches led by a synchronization code, and the judging means receives the transmission data received by the receiving means. The reception control unit determines whether the electric field strength is equal to or higher than a predetermined level, and the reception control unit determines the transmission data to be transmitted when the reception electric field strength of the transmission data is determined to be equal to or higher than a predetermined level by the determination unit. 2. The wireless receiver according to claim 1, wherein the intermittent driving of the receiving means is controlled to be performed only at a timing corresponding to a predetermined frame in each batch after the synchronization is established. 3. The receiving means receives transmission data in a transmission data format composed of a plurality of batches led by a synchronization code, and the judging means receives the transmission data received by the receiving means. The reception control unit determines whether or not the electric field strength is equal to or higher than a predetermined level, and the reception control unit receives the transmission data when the reception electric field strength of the transmission data is determined to be equal to or higher than a predetermined level. Compared with the case where it is determined that the electric field strength is not higher than a predetermined level, the intermittent driving of the receiving means at the timing corresponding to the synchronization code in each batch of the transmission data is controlled to be reduced. The wireless receiver according to claim 1.