JP2990198B1 - Wireless selective call receiver and method - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To prevent a reception rate from decreasing due to an influence other than an influence of intermodulation. SOLUTION: An antenna 101 has N in one call.
(N is an integer of 2 or more) paging signals. The automatic gain control unit 108 can control the gain of the antenna 101 to two values, a high value and a low value.
01 is limited to a low value. The control unit 105
(N-1) when receiving the paging signal for the first time, the synchronization part of the paging signal, the frame information and the block information cannot be confirmed, and the paging number of the paging signal does not match the paging number of its own, or When the message of the paging signal cannot be restored, the automatic gain control unit 108 releases the limitation of the gain of the antenna 101 to a low value and sets the gain of the antenna 101 to a high value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio selective call receiver for selectively receiving a call signal from a base station.

[0002]

2. Description of the Related Art In a conventional radio selective calling receiver,
An automatic gain control circuit is provided to prevent intermodulation. Further, in the conventional radio selective calling receiver, when controlling the automatic gain control circuit, there are a method of performing analog control using electric field detection and a method of performing digital control using reception results. The radio selective calling receiver described in Japanese Patent Application Laid-Open No. Hei 5-3450 forcibly changes the gain distribution of a radio signal input to a receiving unit when a synchronization signal cannot be detected.

[0003]

However, in the conventional radio selective calling receiver, when the gain distribution is forcibly changed based on the reception result of the synchronization signal or the like, influences other than intermodulation (for example, fading) are caused. Even if it is received, the gain distribution is changed, so that there is a problem that the reception rate is reduced.

Further, in the conventional radio selective calling receiver, since the long message culture has recently been progressing, the sensitivity difference between the message and the short synchronization signal tends to be widened. Therefore, the synchronization signal is recognized even in the same environment. Yes, but there is a problem that long messages cannot be recognized. In such a case, in the conventional radio selective calling receiver, if the gain distribution is changed even once, the change is difficult to be canceled, and as a result, there is a problem that the reception rate deteriorates.

[0005] It is an object of the present invention to provide a radio selective call receiver and a method capable of preventing a decrease in reception rate due to an effect other than intermodulation.

[0006]

According to one aspect of the present invention, there is provided an antenna for receiving a radio signal and generating a received signal, and a demodulated signal for demodulating a received signal from the antenna. Receiving section, a decoder section for decoding a demodulated signal from the receiving section to generate a decoded signal, a synchronizing section for the decoded signal upon receiving the decoded signal from the decoder section, frame information, block information and call number. And a storage unit connected to the control unit and holding its own calling number, and two values of a high value and a low value of the gain of the antenna connected to the antenna and the control unit. Automatic gain control unit that can control the antenna gain to a low value, a notification control unit connected to the control unit, and a message control unit connected to the notification control unit. And a notification unit for notifying a di,
Further, in the radio selective call receiver in which the antenna receives N (N is an integer of 2 or more) paging signals in one paging, when the (N-1) -th paging signal is received, the control unit becomes the synchronization unit. When the frame information and the block information cannot be confirmed, the calling number of the calling signal does not match the own calling number, or when the message of the calling signal cannot be restored, the control unit sets the automatic gain control unit to the antenna of the antenna. The present invention is characterized in that the limitation of the gain to a low value is released and the gain of the antenna is set to a high value.

According to a second aspect of the present invention, in the first aspect of the present invention, the control unit receives the (N-1) th call signal and the Nth call signal, and when the control unit cannot restore the message, the control unit outputs the message. It is characterized by being discarded.

According to a third aspect of the present invention, there is provided an antenna for receiving a radio signal to generate a received signal, a receiving unit for demodulating a received signal from the antenna to generate a demodulated signal, and transmitting a demodulated signal from the receiving unit. A decoder unit for decoding to generate a decoded signal, a control unit for receiving a decoded signal from the decoder unit, recognizing frame information, block information and a call number of the decoded signal, and restoring a message; And a storage device that is connected to the receiving unit and holds its own calling number, and is connected to the receiving unit and the control unit so that the gain of the receiving unit can be controlled to two values, a high value and a low value. An automatic gain control unit that limits the gain to a low value; a notification control unit connected to the control unit; and a notification unit connected to the notification control unit and configured to report a message. In a radio selective call receiver that receives N (N is an integer of 2 or more) paging signals in the paging call, when the (N-1) th paging signal is received, the control unit transmits the synchronization unit, the frame information, and the block information to each other. If it cannot be confirmed, the calling number of the calling signal does not match its own calling number, or if the message of the calling signal cannot be restored, the control unit sets the gain of the receiving unit to a low value by the automatic gain control unit. It is characterized in that the restriction is released and the gain of the receiving unit is set to a high value.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the control section receives the (N-1) th call signal and the Nth call signal, and cannot restore the message when the message cannot be restored. It is characterized by being discarded.

According to a fifth aspect of the present invention, there is provided an antenna for receiving a radio signal and generating a received signal, a receiving section for demodulating a received signal from the antenna to generate a demodulated signal, and transmitting a demodulated signal from the receiving section. A decoder unit for decoding to generate a decoded signal, a control unit for receiving a decoded signal from the decoder unit, recognizing frame information, block information and a call number of the decoded signal, and restoring a message; And a storage device which is connected to an antenna and a control unit, and which is connected to an antenna and a control unit so that the gain of the antenna can be controlled to two values, a high value and a low value, and the gain of the antenna is low. An automatic gain control unit that limits the value, a notification control unit connected to the control unit,
And a notification unit connected to the notification control unit for notifying a message, and the antenna is configured such that N (N is 2
In the radio selective call receiving method of the radio selective call receiver that receives the above (integer) number of call signals, the control unit can confirm the synchronization unit, the frame information, and the block information when receiving the (N-1) th call signal. A judgment step of judging whether the call number of the call signal matches the call number of the own device and whether the message of the call signal could be restored, and receiving the (N-1) th call signal When the control unit cannot confirm the synchronization unit, frame information and block information, the calling number of the calling signal does not match its own calling number, or the control unit cannot automatically restore the message of the calling signal, Releasing the gain control unit from limiting the antenna gain to a low value to increase the antenna gain to a high value.

According to a sixth aspect of the present invention, there is provided an antenna for receiving a radio signal to generate a received signal, a receiving unit for demodulating a received signal from the antenna to generate a demodulated signal, and transmitting a demodulated signal from the receiving unit. A decoder unit for decoding to generate a decoded signal, a control unit for receiving a decoded signal from the decoder unit, recognizing frame information, block information and a call number of the decoded signal, and restoring a message; And a storage device that is connected to the receiving unit and holds its own calling number, and is connected to the receiving unit and the control unit so that the gain of the receiving unit can be controlled to two values, a high value and a low value. An automatic gain control unit that limits the gain to a low value; a notification control unit connected to the control unit; and a notification unit connected to the notification control unit and configured to report a message. In the radio selective call receiving method of the radio selective call receiver which receives N (N is an integer of 2 or more) paging signals in the paging call, when the (N-1) th paging signal is received, the control unit communicates with the synchronization unit. A determination step of determining whether the frame information and the block information can be confirmed, whether the calling number of the calling signal matches the own calling number, and whether the message of the calling signal can be restored;
-1) When receiving the second call signal, the control unit cannot confirm the synchronization unit, the frame information and the block information, and the call number of the call signal does not match its own call number, or the message of the call signal is When the restoration cannot be performed, the control unit releases the automatic gain control unit from restricting the gain of the receiving unit to a low value and sets the gain of the receiving unit to a high value.

[0012]

Next, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a radio selective calling receiver according to an embodiment of the present invention includes an antenna 1
01, receiving unit 102, decoder unit 103, and ID-ROM
104, control unit 105, notification control unit 106, and notification unit 10
7 and an automatic gain control unit 108. Receiver 10
2 is connected to the antenna 101. Decoder section 1
03 is connected to the receiving unit 102. Control unit 105
Are the receiving unit 102, the decoder unit 103, and the ID-RO
M104. The notification control unit 106 is connected to the control unit 105. The notification unit 107 is connected to the notification control unit 106. The automatic gain control unit 108
It is connected to the antenna 101 and the control unit 105.

The antenna 101 receives a radio signal and generates a reception signal. A base station (not shown) transmits N (N is an integer of 2 or more) paging signals in one paging. Therefore, antenna 101 receives a call signal N times as a radio signal in one call and generates a reception signal. Receiver 102 demodulates a signal received from antenna 101 to generate a demodulated signal. Decoder section 103
Decodes the demodulated signal from the receiving unit 102 to generate a decoded signal. The ID-ROM 104 holds its own calling number.

The control section 105 receives the decoded signal from the decoder section 103 and checks the synchronization section, frame information, block information and call number of the decoded signal. Further, the control unit 105 controls the calling number of the calling signal and the ID-RO.
It is confirmed whether or not they match by comparing the calling number of M4 with its own calling number. Further, control unit 105 checks whether the message of the call signal has been restored. The control unit 105 can confirm the synchronization unit, the frame information, and the block information, and can call the call number of the call signal and the ID-ROM 1
When it is possible to confirm that the calling number of the telephone number 04 matches its own calling number and whether it is possible to restore the message of the calling signal, the message and the notification instruction are given to the notification control unit 106. The notification control unit 106, when receiving a message and a notification command from the control unit 105, notifies the notification unit 10
Let 7 know. If the message cannot be restored during the reception of the call signal a plurality of times, the control unit 105 sends the message and the broadcast instruction until the message can be correctly restored in the subsequent reception of the call signal.
Hold on giving to 6.

The automatic gain control unit 108
Can be controlled to two values, a high value and a low value, and the gain of the antenna 101 is limited to a low value. When receiving the (N-1) th call signal, control section 105 cannot confirm the synchronization section, the frame information and the block information, and the call number of the call signal does not match its own call number, or When the message of the signal cannot be restored, the automatic gain control unit 108 releases the limitation of the gain of the antenna 101 to a low value and cancels the antenna 10.
The gain of 1 is set to a high value.

Next, the operation of the radio selective call receiver of FIG. 1 will be described with reference to FIGS. 2, 3, 4 and 5. The base station transmits the same paging signal a plurality of times for one paging to the radio selective paging receiver of FIG. here,
The base station will be described by limiting the case where the same paging signal is transmitted only twice for one paging to the radio selective paging receiver of FIG.

FIG. 2 is an example showing transmission timings of the first transmission signal and the second transmission signal when the number of transmissions of the transmission signal is two. The base station repeatedly transmits transmission signals of all 128 frames ranging from 0 to 127.
The radio selective call receiver performs a receiving operation only for a frame specified in advance and a frame according to a receiving cycle. The transmission signal transmitted twice is always transmitted continuously in the received frame. In FIG. 2, a call signal 202 is a first call signal, and a call signal 203 is a second call signal.

FIG. 3 is an example showing the internal structure of each frame of the received signal. The synchronization unit 301 and the synchronization unit 303 are signals for the radio selective calling receiver to perform bit synchronization.
The frame information 302 is a signal for the radio selective calling receiver to obtain frame synchronization. The block information 304 includes the reception cycle information of the system. Call number 30
5 contains individual call numbers. Message information 3
06 includes a message corresponding to the call number on a one-to-one basis.

In the radio selective calling receiver of FIG. 1, FIG.
The case where the call signals 202 and 203 are received will be described. For the first transmission signal 202, a reception signal is generated by the antenna 101 in an amount corresponding to the gain of the antenna 101 and is sent to the reception unit 102. The receiving section 102 amplifies the received signal to a voltage that can be demodulated, demodulates the signal, generates a demodulated signal, and sends the signal to the decoder section 103. Decoder section 10
3 decodes the demodulated signal to generate a decoded signal and sends it to the control unit 105. The control unit 105 includes a synchronization unit 301,
The frame information 302, the synchronization unit 303, and the block information 304 are checked. Here, when the synchronization unit 301, the frame information 302, the synchronization unit 303, or the block information 304 cannot be confirmed in the first reception frame, the control unit 105 operates the automatic gain control unit 108 in the next second reception frame 203. Then, the limitation of the gain of the antenna 101 to a low value is released, and the gain of the antenna 101 is set to a high value. Also, in this case, the control unit 105
Discard the second received signal.

On the other hand, the control unit 105 includes a synchronization unit 301, frame information 302, synchronization unit 303, and block information 3
If the call number 04 can be confirmed, it is confirmed whether or not the call number stored in the ID-ROM 104 and the call number 305 of the received signal (call signal) sent from the decoder unit 103 match. When the call number of the control unit 105 matches the call number 305, the control unit 105
06 is restored. When the calling number and the calling number 305 do not match, control section 105 discards the received signal. When the message is correctly restored, the control unit 105 gives the message and the notification instruction to the notification control unit 106. When receiving the message and the notification instruction, the notification control unit 106 drives the notification unit 107 to notify the receiver carrier that the call has been made. However, when the restoration of the message 306 cannot be accurately performed, the control unit 105 suspends the message 306 and the broadcast instruction, waits for the second reception signal, and checks the state of the automatic gain control unit 108 at the same time. When the antenna gain is limited, the automatic gain control unit 108 releases the limitation of the gain of the antenna 101 to a low value in the next second reception frame 203 and sets the gain of the antenna 101 to a high value. .

The control unit 105 controls the second call signal 203
When the notification operation is being performed with the first call signal 202 at the time of receiving the second call signal, the second call signal is discarded. Further, when the notification is put on hold by the first call signal 202, the control unit 105 performs the operation of restoring the message, and accurately outputs the message by combining the restoration of the first message and the restoration of the second message. When the message can be restored, the message and the notification command are given to the notification control unit 106. At this time, the notification control unit 106 drives the notification unit 107 to notify the receiver carrier of the call. The control unit 105 discards the first message and the second message when the message cannot be correctly restored by combining the restoration of the first message and the restoration of the second message.

Next, the operation of the radio selective calling receiver of FIG. 1 will be described with reference to the flowcharts of FIGS. FIG. 4 shows a first reception process (step S1) when the base station transmits a transmission signal only twice (when transmitting twice). In the first reception processing at the time of the two transmissions in step S1, the radio selective calling receiver sets 2 in step S2.
It is determined whether the first transmission signal has been received among the transmission signals. In step S2, the radio selective calling receiver is 2
When the first transmission signal of the transmission signals is received,
In step S3, the control unit 105 controls the synchronization unit 301, the frame information 302, the synchronization unit 303, and the block information 3
04 is confirmed. In step S3, the control unit 10
5 is a synchronization unit 301, frame information 302, synchronization unit 30
3 and the block information 304, the call number 30 of the received signal (call signal) is determined in step S4.
Check whether 5 and its own calling number match. When the call number 305 of the received signal (call signal) does not match its own call number in step S5, the control unit 105 does not give a notification command to the notification control unit 106 and the notification unit 107 does not report anything in step S6. When the call number 305 of the received signal (call signal) matches the own call number in step S5, the control unit 105 checks in step S6 whether the message has been correctly restored.
If it is confirmed in step S5 that the message has been correctly restored, the control unit 1 proceeds to step S7.
Reference numeral 05 denotes a notification control unit 106 for transmitting a message and a notification instruction.
To inform the receiver carrier that there is a call.

In step S3, the control unit 105
When the synchronization unit 301, the frame information 302, the synchronization unit 303, and the block information 304 cannot be confirmed, in step S8, the control unit 105 confirms whether the gain of the antenna 101 is limited to a low value. When the gain of the antenna 101 is limited to a low value in step S8, the control unit 105
5 designates an instruction to release the limitation of the gain of the antenna 101 to a low value at the next reception, and the step S14-2 is performed.
It goes to the second reception process at the time of transmission twice. When the control unit 105 determines that the gain of the antenna 101 is not limited to the low value in step S8, the control unit 105 determines in step S10 whether unconfirmed that the gain of the antenna 101 is limited to the low value is two consecutive times. Check. When the unconfirmation of the fact that the gain of the antenna 101 is limited to a low value is performed twice consecutively in step S10, the control unit 105 restricts the gain of the antenna 101 to a low value at the next reception in step S11. Then, the process proceeds to the second reception process at the time of twice transmission in step S14. Even if the unconfirmation of the fact that the gain of the antenna 101 is limited to a low value is not performed twice consecutively in step S10, the process proceeds to the second reception process at the time of transmitting twice in step S14.

If it cannot be confirmed in step S6 that the message has been correctly restored, the process proceeds to step S12.
In, the control unit 105 checks whether the gain of the antenna 101 is limited to a low value. When the gain of the antenna 101 is limited to a low value in step S12, the control unit 105 issues an instruction to release the limitation of the gain of the antenna 101 to the low value at the next reception in step S13, and then proceeds to step S14. It goes to the second reception process at the time of the second transmission. If the gain of the antenna 101 is not limited to a low value in step S12, the process proceeds to the second reception process of the second transmission in step S14.

FIG. 5 shows a second reception process (step S) when the base station transmits a transmission signal only twice (when transmitting twice).
14). 2 at the time of transmission twice in step S14
In the second reception process, it is determined in step S15 whether the radio selective calling receiver has received the second transmission signal out of the two transmission signals. In step S15, when the radio selective calling receiver receives the second transmission signal out of the two transmission signals, in step S16, the control unit 105 controls the synchronization unit 301, the frame information 302, and the synchronization unit 3
03 and the block information 304 are confirmed. In step S16, the control unit 105 controls the synchronization unit 301, the frame information 302, the synchronization unit 303, and the block information 304.
Is confirmed, in step S17, it is confirmed whether or not the call number 305 of the received signal (call signal) matches the call number of its own. When the call number 305 of the received signal (call signal) does not match the call number of the own device in step S17, the control unit 105 in step S18.
Sends the notification command to the notification control unit 106 without giving the notification command to the notification control unit 106.
Does not report anything. When the call number 305 of the received signal (call signal) matches the own call number in step S17, the control unit 105 confirms in step S19 whether the message has been correctly restored. Step S
If it is confirmed in step 19 that the message has been correctly restored, the control unit 105 proceeds to step S20.
Sends a message and a notification command to the notification control unit 106 to drive the notification unit 107 to notify the receiver carrier of the call. If it cannot be confirmed in step S19 that the message has been correctly restored, the control unit 105 does not give a notification command to the notification control unit 106 and the notification unit 107 does not report anything in step S18.

In step S16, the control unit 105
Synchronizer 301, frame information 302, synchronizer 303
If the block information 304 cannot be checked, the control unit 105 checks in step S21 whether the gain of the antenna 101 is limited to a low value. Step S
When the control unit 105 restricts the gain of the antenna 101 to a low value in 21, the control unit 105 instructs in step S22 to release the restriction of the gain of the antenna 101 to the low value at the next reception. Go to step S18. When the control unit 105 does not limit the gain of the antenna 101 to a low value in step S21, the control unit 105
Unconfirmed that the gain of 01 is limited to a low value is 2
Check if it is consecutive. When it is determined that the gain of the antenna 101 is limited to a low value in step S23 for two consecutive times, in step S24 the control unit 105 limits the gain of the antenna 101 to a low value at the next reception. Command to cancel
Go to step S18. If it is determined that the gain of the antenna 101 has not been limited to a low value in step S23, it is not confirmed twice consecutively, the process proceeds to step S18.

In the first embodiment of the present invention, a case has been described where the number of times of transmission of a call signal is two in one call, but the number of times of transmission of a call signal in one call is not limited. In the case where the number of times of transmitting the call signal is three or more in one call, the present invention may be applied only to the last two times. That is, in this case, the antenna 10
In a radio selective call receiver in which 1 receives N (N is an integer of 3 or more) call signals in one call, (N-
1) When receiving the first call signal, the control unit 105 cannot confirm the synchronization unit, the frame information and the block information, and the call number of the call signal does not match its own call number, or the message of the call signal is When the restoration cannot be performed, the control unit 105 releases the automatic gain control unit 108 from limiting the gain of the antenna 101 to a low value, and
The gain of 1 is set to a high value.

Next, a second embodiment of the present invention will be described with reference to the drawings. In a second embodiment of the present invention,
The same components as those in the first embodiment of the present invention are denoted by the same reference numerals. As shown in FIG. 6, a radio selective calling receiver according to a second embodiment of the present invention includes an antenna 101, a receiving unit 102, a decoder unit 103, and an ID-ROM 104.
, A control unit 105, a notification control unit 106, a notification unit 107, and an automatic gain control unit 108.

Next, only the configuration and operation of the second embodiment of the present invention that are different from those of the first embodiment of the present invention will be described. Automatic gain control section 108 is connected to receiving section 102 and control section 105. The antenna 101 receives N (N is an integer of 2 or more) paging signals in one paging. Automatic gain control section 108 can control the gain of receiving section 102 to two values, a high value and a low value, and limits the gain of receiving section 102 to a low value. When the control unit 105 receives the (N-1) th call signal, the control unit 105 cannot confirm the frame information and the block information with the synchronization unit, and the call number of the call signal does not match its own call number. Or, when the message of the paging signal cannot be restored, the automatic gain control unit 108
Of the gain of the receiving unit 10
The gain of 2 is set to a high value.

Next, a third embodiment of the present invention will be described with reference to the drawings. In a third embodiment of the present invention,
The same components as those in the first and second embodiments of the present invention are denoted by the same reference numerals. In the radio selective calling receiver according to the third embodiment of the present invention, the automatic gain control unit 1
08 has an electric field detection device. In the flowcharts of FIGS. 7 and 8, operating the automatic gain control unit 108 cancels the automatic gain control unit 108 restricting the gain of the antenna 101 or the receiving unit 102 to a low value, and cancels the antenna 101 or This shows that the gain of the receiving unit 102 is set to a high value.

FIG. 7 shows a first reception process (step S) when the base station transmits a transmission signal only twice (when transmitting twice).
31). 1 at the time of transmission twice in step S31
In the second reception process, it is determined in step S32 whether the radio selective calling receiver has received the first transmission signal of the two transmission signals. When the radio selective calling receiver receives the first transmission signal of the two transmission signals in step S32, the control unit 105 controls the synchronization unit 301, the frame information 302, and the synchronization unit 3 in step S33.
03 and the block information 304 are confirmed, and it is confirmed whether or not the call number 305 of the received signal matches the call number of its own. In step S33, the synchronization unit 301, the frame information 302, the synchronization unit 303, and the block information 304 are confirmed, and when it is confirmed that the call number 305 of the received signal matches its own call number, the control unit 105 proceeds to step S34. Verify that the message was restored correctly. When it is confirmed in step S34 that the message has been correctly restored, in step S35, the control unit 105 gives the message and the notification command to the notification control unit 106, drives the notification unit 107, and calls the receiver carrier. Notify that there was.

If it cannot be confirmed in step S34 that the message has been correctly restored, step S3
In 6, the control unit 105 checks whether the automatic gain control unit 108 is operating. When it is confirmed in step S36 whether the automatic gain control unit 108 is operating,
In step S37, the control unit 105 instructs the automatic gain control unit 108 to stop only at the next reception, and then proceeds to the second reception process at the time of two transmissions in step S39.

When it is not possible to confirm the synchronization section 303 and the block information 304 in step S33, or to confirm that the calling number 305 of the received signal does not match its own calling number, and in step S36, the automatic gain control section 108 If it is not possible to confirm whether or not is operating, the control unit 105 instructs the automatic gain control unit 108 to operate only at the next reception in step S38, and then proceeds to the second reception process at the time of two transmissions in step S39. .

FIG. 8 shows a second reception process (step S) when the base station transmits a transmission signal only twice (when transmitting twice).
39). 2 when transmitting twice in step S39
In the second reception process, it is determined in step S40 whether the radio selective calling receiver has received the second transmission signal of the two transmission signals. In step S40, when the radio selective calling receiver receives the second transmission signal out of the two transmission signals, in step S41, the control unit 105 controls the synchronization unit 301, the frame information 302, and the synchronization unit 3
03 and the block information 304 are confirmed, and it is confirmed whether or not the call number 305 of the received signal matches the call number of its own. In step S41, the synchronization unit 301, the frame information 302, the synchronization unit 303, and the block information 304 are confirmed. When it is confirmed that the call number 305 of the received signal matches the call number of the own unit, in step S42, the control unit 105 Verify that the message was restored correctly. When it is confirmed in step S42 that the message has been correctly restored, in step S43, the control unit 105 gives the message and the notification instruction to the notification control unit 106, drives the notification unit 107, and calls the portable receiver. Notify that there was.

If it is not confirmed in step S42 that the message has been correctly restored, step S4
In 4, the control unit 105 checks whether the automatic gain control unit 108 is operating. When it is confirmed in step S44 whether the automatic gain control unit 108 is operating,
In step S45, the control unit 105 instructs the automatic gain control unit 108 to stop only at the next reception, and then proceeds to step S47.

When it is not possible to confirm the synchronization section 303 and the block information 304 in step S41, or to confirm that the call number 305 of the received signal does not match its own call number, and in step S44, the automatic gain control section 108 If it is not possible to confirm whether or not is operating, the control unit 105 instructs the automatic gain control unit 108 to operate only at the next reception in step S46, and then proceeds to step S47. In step S47,
The control unit 105 does not give the notification command to the notification control unit 106, and the notification unit 107 does not report anything.

[0037]

According to the present invention, it is possible to prevent the automatic gain control section originally intended to reduce the influence of the intermodulation from operating when the influence of the intermodulation is not affected, thereby deteriorating the reception rate. Further, the present invention can reduce the number of unnecessary operations of the automatic gain control unit and prolong the battery life.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a radio selective calling receiver as a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a transmission signal received by the radio selective calling receiver of FIG. 1;

FIG. 3 is a diagram for explaining a frame of a transmission signal received by the radio selective calling receiver of FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the radio selective calling receiver of FIG. 1;

FIG. 5 is another flowchart for explaining the operation of the radio selective calling receiver of FIG. 1;

FIG. 6 is a block diagram showing a radio selective call receiver according to a second embodiment of the present invention.

FIG. 7 is a flowchart for explaining the operation of a radio selective calling receiver as a third embodiment of the present invention.

FIG. 8 is another flowchart for explaining the operation of the radio selective calling receiver as the third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 101 antenna 102 receiving unit 103 decoder unit 104 ID-ROM 105 control unit 106 notification control unit 107 notification unit 108 automatic gain control unit

Claims (6)

(57) [Claims] An antenna for receiving a radio signal to generate a received signal, a receiving unit for demodulating the received signal from the antenna to generate a demodulated signal, and decoding the demodulated signal from the receiving unit A decoder for receiving the decoded signal from the decoder, receiving the decoded signal from the decoder, confirming the frame information, the block information and the call number, and restoring the message; A storage device connected to a unit and holding its own calling number; and connected to the antenna and the control unit, the gain of the antenna can be controlled to two values, a high value and a low value, and An automatic gain control unit that limits the gain of the antenna to a low value; a broadcast control unit connected to the control unit; and a broadcast unit connected to the broadcast control unit and broadcasts the message. A paging receiver, wherein the antenna receives N (N is an integer of 2 or more) paging signals in one paging, and receives the (N-1) th paging signal in the radio selective paging receiver. When the control unit cannot confirm the synchronization unit, the frame information and the block information, the call number of the call signal does not match the own call number, or the message of the call signal is restored. When you can't
The radio selective call receiver, wherein the control unit releases the automatic gain control unit from restricting the gain of the antenna to a low value and sets the gain of the antenna to a high value. 2. The radio selective call receiver according to claim 1, wherein the control unit receives the (N-1) th call signal and the Nth call signal and cannot restore the message. A radio selective call receiver for discarding a message. 3. An antenna for receiving a radio signal to generate a received signal, a receiving unit for demodulating the received signal from the antenna to generate a demodulated signal, and decoding the demodulated signal from the receiving unit. A decoder for receiving the decoded signal from the decoder, receiving the decoded signal from the decoder, confirming the frame information, the block information and the call number, and restoring the message; A storage device connected to the unit and holding its own call number, and connected to the receiving unit and the control unit, the gain of the receiving unit can be controlled to two values, a high value and a low value,
And an automatic gain control unit that limits the gain of the reception unit to a low value; a notification control unit connected to the control unit; and a notification unit connected to the notification control unit and configured to report the message. A radio selective paging receiver, wherein the antenna receives N (N is an integer of 2 or more) paging signals in one paging, wherein the control is performed when the (N-1) th paging signal is received. Unit cannot confirm the synchronization unit, the frame information and the block information, the call number of the call signal does not match the call number of its own, or the message of the call signal cannot be restored. Sometimes
The radio selective call receiver, wherein the control unit releases the automatic gain control unit from restricting the gain of the receiving unit to a low value and sets the gain of the receiving unit to a high value. 4. The radio selective call receiver according to claim 3, wherein the control unit receives the (N-1) th call signal and the Nth call signal and cannot restore the message. A radio selective call receiver for discarding a message. 5. An antenna for receiving a radio signal to generate a received signal, a receiving unit for demodulating the received signal from the antenna to generate a demodulated signal, and decoding the demodulated signal from the receiving unit. A decoder for receiving the decoded signal from the decoder, receiving the decoded signal from the decoder, confirming the frame information, the block information and the call number, and restoring the message; A storage device connected to a unit and holding its own calling number; and connected to the antenna and the control unit, the gain of the antenna can be controlled to two values, a high value and a low value, and An automatic gain control unit that limits the gain of the antenna to a low value; a broadcast control unit connected to the control unit; and a broadcast unit that is connected to the broadcast control unit and broadcasts the message. A radio selective call receiving method, wherein the antenna receives N (N is an integer of 2 or more) paging signals in one paging. A) whether the control unit can confirm the synchronizing unit, the frame information and the block information when receiving the second call signal, whether the call number of the call signal matches the own call number, and A judging step of judging whether or not the message of the paging signal has been successfully restored; and upon receiving the (N-1) th paging signal, the control unit confirms the synchronization unit, the frame information, and the block information. When the call number of the call signal does not match the call number of its own, or when the message of the call signal cannot be restored, the control unit sets the automatic gain control unit to Releasing the restriction of the antenna gain to a low value and setting the antenna gain to a high value. 6. An antenna for receiving a radio signal and generating a received signal, a receiving unit for demodulating the received signal from the antenna to generate a demodulated signal, and decoding the demodulated signal from the receiving unit A decoder for receiving the decoded signal from the decoder, receiving the decoded signal from the decoder, confirming the frame information, the block information and the call number, and restoring the message; A storage device connected to the unit and holding its own call number, and connected to the receiving unit and the control unit, the gain of the receiving unit can be controlled to two values, a high value and a low value,
And an automatic gain control unit that limits the gain of the reception unit to a low value; a notification control unit connected to the control unit; and a notification unit connected to the notification control unit and configured to report the message. And wherein the antenna receives N (N is an integer equal to or greater than 2) paging signals in one paging operation.
1) whether the control unit can confirm the synchronizing unit, the frame information and the block information when receiving the paging signal for the first time, whether the paging number of the paging signal matches the own paging number, and A determination step of determining whether the message of the call signal has been successfully restored; and upon receiving the (N-1) th call signal, the control unit determines the synchronization unit, the frame information, and the block information. When the call number of the call signal does not match the call number of its own, or when the message of the call signal cannot be restored, the control unit determines that the automatic gain control unit is the receiving unit. Canceling the limitation of the gain of the receiving unit to a low value and setting the gain of the receiving unit to a high value.