JP3420170B2 - Wireless reception method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiving method in an individually selected paging receiver used for a mobile communication device or the like. 2. Description of the Related Art In a communication system in which a plurality of receivers are given different individual identification numbers and each receiver sends an identification number unique to each receiver to selectively call a particular receiver. In the individual selective call receiving apparatus, the receiving sensitivity is the most important, and it is desirable that the receiving can be performed regardless of the user in any area. [0003] However, in the above-mentioned conventional individual selective call receiving apparatus, the transmission time interval from the normal transmitting station is about 5 minutes, and transmission for 2 minutes and transmission for 3 minutes are repeated. Radio waves are attenuated behind buildings and buildings, or indoors, and the electric field strength that reaches the reception sensitivity may not be obtained. There was a problem of anxiety. The present invention solves such a conventional problem. In a radio system in which transmission and transmission are interrupted at regular intervals, a user considers the time during which transmission is suspended and considers his or her own. An object of the present invention is to provide a wireless communication method capable of accurately knowing that a receiver to be used is out of a receivable area. [0005] In order to achieve the above object, the present invention provides a radio system that repeats transmission and disconnection.
Wireless reception method in
A first procedure for detecting a frame synchronization signal;
When the frame synchronization signal is detected in this order, the synchronization is maintained.
And performs collation of the frame synchronization signal in a predetermined time series.
The second procedure and the collation of the frame synchronization signal are continuously performed.
Processing for releasing the synchronization hold when the number of times of mismatch does not match
Detection of the frame synchronization signal in the asynchronous reception operation.
A third procedure, and the frame in the third procedure.
If the synchronization signal cannot be detected,
If within the preset time from the release of the hold, the third
Return to the procedure described above, and report that it is out of service area if the time is exceeded
It is provided with a process to know. Therefore, according to the present invention, after the transmission is once completed, while performing the operation of acquiring the next transmission again,
Since the out-of-service notification is performed, the user can accurately recognize that the user is out of service in consideration of the time when transmission is suspended. FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a radio wave receiving unit which receives an RF radio wave, amplifies it, and outputs it to a demodulation unit 12. Reference numeral 13 denotes an IDRO as a read-only storage unit storing an individually selected call number for each receiver.
M, and outputs the individually selected call number stored in the IDROM 13 to the demodulation unit 12. Reference numeral 14 denotes a synchronization holding circuit which receives an output of the demodulation unit 12, performs synchronization verification, and holds a frame synchronization signal in a preamble. Reference numeral 15 denotes a control circuit (hereinafter referred to as a CPU). When the frame synchronization signal 14a held by the circuit 14, that is, the detection signal of the frame synchronization signal is received, the intermittent reception timer 16 is started, and when the synchronization holding is released, the synchronization holding monitoring timer 17 is started. ing. The synchronization holding monitoring timer 17 and the intermittent reception timer 16 constitute a timer circuit. Reference numeral 18 denotes an alarm drive notifying circuit which is activated by the output of the CPU 15 and drives a sounding body 19 such as a speaker. The alarm driving notifying circuit 18 and the sounding body 19 constitute notifying means. Reference numeral 20 denotes a power supply battery, which applies an operating voltage to the CPU 15. Reference numeral 21 denotes an input of the output of the intermittent reception timer 16 for receiving the radio wave reception unit 11 and the demodulation unit 12.
Is an intermittent reception operation control circuit that performs operation control so as to be in a synchronous intermittent reception state. Next, the operation of the first embodiment will be described.
First, a description will be given together with the timing chart of FIG. The radio wave received by the radio wave receiving unit 11 is demodulated by the demodulation unit 12,
A reception signal corresponding to the transmission signal 31 shown in FIG. The synchronization holding circuit 14 performs synchronization verification (hereinafter referred to as SC verification) and storage. When a frame synchronization signal following the preamble of the transmission signal 31 is detected, the synchronization holding circuit 14 holds the synchronization until the transmission is cut off (FIG. 3A) as indicated by the signal 32 in FIG. 3B. The transmission signal 31 shown in FIG.
No. This is a signal format conforming to one system. At this time, holding the frame synchronization signal means
After the frame synchronization collation, the SC collation operation is performed by measuring the timing of the frame synchronization signal inserted at regular intervals by the same method, and the frame synchronization signal is generated in a predetermined time series (IBatch is 1.0625 seconds). In the operation of confirming that the frame synchronization signal has been inserted, the frame synchronization signal is continuously n times (n is a natural number, for example, 2) in a predetermined time series. Collating the frame synchronization signal only in the sequence. At the same time as receiving the detection signal of the frame synchronization signal 14a, the CPU 15 activates the intermittent reception timer 16 and shifts the intermittent reception operation control circuit 21 to the synchronous intermittent reception state. In the synchronous intermittent reception operation, SC collation in a predetermined time series and collation operation of an individually selected call number in a predetermined time series following a frame synchronization signal called a self-frame are performed. That is, the individually selected calling number stored in the IDROM 13 is input to the demodulation unit 12, and the individually selected calling number and the received data are demodulated. After that, if the SC collation mismatch does not occur twice, the synchronization is maintained by the synchronization recovery function as indicated by a signal 33a in FIG. 3B. When the synchronization holding of the signal 33a is released, the CPU 15 subsequently starts a new synchronization holding monitoring timer 17 as shown in FIG. Start timing operation until TA). If the frame synchronization is obtained before the time TA is reached, it is determined that the frame is within the receivable range, and as shown by a signal 35 in FIG. And reset the intermittent reception operation control circuit 2
1 is released from the synchronous intermittent reception state, and shifts to a normal asynchronous reception operation. On the other hand, as shown in the operation following the signal 33b in FIG.
If the frame synchronization is not acquired until the time reaches, the time-out occurs as indicated by a signal 36 in FIG. 3C, and it is determined that the reception is out of the reception area as shown in FIG.
The alarm drive notifying circuit 18 is activated at the timing indicated by the signal 37 in (d), and the sounding body 19 is driven to notify the user of an alarm indicating that the user is out of the reception area. FIG. 2 is a flow chart showing a process up to an out-of-reception area warning notification.
When synchronization is obtained in step a, the intermittent reception timer 16 is started in step 23, and the SC non-collating counter TSC is reset (initialized) to 0 in step 24. In this intermittent reception operation, in step 25b, SC comparison is performed in a predetermined time series, and in step 25a, an operation of collating an individually selected calling number in a predetermined time series following the self-frame synchronization signal is performed. While the synchronization holding operation continues (FIG. 3
(Corresponding to signals 32-34 in (b)) indicates that the TSC counter is 2
The synchronous intermittent reception state is maintained below. If the synchronization holding SC collation in step 25b becomes impossible (out of synchronization), the process proceeds to step 26a, where 1 is added to the out of synchronization counter TSC. In step 26b, TSC =
If the synchronization is continuously lost until the TSC becomes 2 in the process of step 26a with the value of 1, the intermittent reception timer 16 is released, and the synchronization holding is released in step 26c. When the synchronization is verified again, the process returns to step 24 and the counter TSC is reset to zero. When the intermittent reception timer 16 is released, the synchronization holding monitoring timer 17 is initialized (T2 = 0) in step 27a, activated in step 27b, and the time until reacquisition of synchronization is a predetermined value (time). Until TA), the frame synchronization acquisition operation is continued in step 21b. In this synchronization acquisition operation, when there is no SC in step 28a, 1 is added to the synchronization holding monitoring timer 17, and if the synchronization is reacquired in step 21b before the count of T2 reaches the time TA by the determination in step 28b, , The process returns to step 23 according to the determination in step 22b, and enters the normal intermittent reception state. When the count of the synchronization holding monitoring timer 17 exceeds the time TA, an alarm notification function is activated in step 29 to notify the user that the user is out of the reception area. Then, the asynchronous reception operation, which is the synchronization acquisition operation, is maintained. As described above, according to the first embodiment,
When the synchronization is maintained by collating the frame synchronization signal received by the radio wave receiving unit 11 at predetermined intervals, the CPU 15 starts the intermittent reception timer 16 and the intermittent reception operation control circuit 21
Is set to the synchronous intermittent reception state, the radio wave receiving unit 11 and the demodulation unit 12 are operated, the data from the IDROM 13 is input to the demodulation unit 12, and the collation of the individually selected calling number is performed by the CPU 1.
In step 5, when the collation of the frame synchronization signal does not match, after the elapse of a predetermined time, the output of the synchronization holding monitoring timer 17 drives the alarm drive notifying circuit 18 to activate the sounding body 19, so that the electric field strength is insufficient and This has the effect that a warning can be issued when the vehicle deviates from the available area, and the user can know the current position. According to the present invention, as is apparent from the above embodiment,
Even if a frame synchronization collation mismatch occurs, the synchronization is maintained by the synchronization recovery function within a certain period of time, and when the synchronization non-collation state continues, it is determined that the frame is out of the reception area and a warning is issued. That is, while performing the operation of reacquiring the next transmission after the transmission is once completed,
In order to perform out-of-service notification, in consideration of the time when transmission is suspended in a wireless system that repeats transmission and disconnection at regular intervals, the user must ensure that the user is out of service without overlooking the next synchronization acquisition. You can figure out.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of an individually-selected paging receiver according to a first embodiment of the present invention. FIG. 2 is a timing chart for explaining the operation of the individually-selected paging receiver of FIG. FIG. 3 is a flowchart showing the flow of operation of the individual selective call receiving apparatus of FIG. 1. [Description of References] 11 Radio wave receiving unit 12 Demodulation unit 13 IDROM 14 Synchronization holding circuit 15 CPU 16 Intermittent reception timer 17 Synchronization holding monitoring timer 18 Alarm Driving notification circuit 19 Sounder 20 Power battery 21 Intermittent reception operation control circuit

Claims (1)

(57) [Claims] [Claim 1] A wireless system that repeats transmission and disconnection
Wireless reception method in
A first procedure for detecting a frame synchronization signal;
When the frame synchronization signal is detected in this order, the synchronization is maintained.
And performs collation of the frame synchronization signal in a predetermined time series.
The second procedure and the collation of the frame synchronization signal are continuously performed.
Processing for releasing the synchronization hold when the number of times of mismatch does not match
Detection of the frame synchronization signal in the asynchronous reception operation.
A third procedure, and the frame in the third procedure.
If the synchronization signal cannot be detected,
If within the preset time from the release of the hold, the third
Return to the procedure described above, and report that it is out of service area if the time is exceeded
A wireless receiving method comprising a process of notifying .