JPH06244777A - Selective radio call receiver and radio frequency channel searching method therefor - Google Patents

Abstract

PURPOSE:To shorten time for deciding a target radio frequency channel by judging only a channel whose reception electric field intensity exceeds a reference value and system information coincides as the target radio frequency channel. CONSTITUTION:An electric field detection part 109 detects the reception electric field intensity of the radio frequency channel received by an antenna 101 and a radio part 102 and sends it to a reception channel control part 111. The control part 111 immediately switches to the next radio frequency channel when the reception electric field intensity is less than the predetermined reference value and enquires a system information comparing part 104 of the coincidence and non-coincidence of the system information when the reception electric field intensity exceeds the reference value. Then, the next radio frequency channel is switched in the case of the non-coincidence and the radio frequency channel during reception is decided as a target reception channel and the reception of selective call information is advanced in the case of the coincidence. By this constitution, the time for searching the target reception channel can be shortened and also the consumption of a battery can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective call receiver, and more particularly to a radio selective call receiver used in a plurality of radio selective call systems having different radio frequencies.

[0002]

2. Description of the Related Art A radio selective call receiver used in a plurality of radio selective call services using different radio frequency channels searches a radio frequency band including those radio frequency channels to selectively receive the radio frequency channels. For each sequentially received channel, it is necessary to determine whether or not it is the target radio frequency channel that the own receiver can receive service from. Therefore, each radio frequency channel contains system information for identifying the radio selective calling system, and the receiver stores the system information contained in the sequentially received channels and the system information held by the own receiver. Compare, if it matches, it is determined to be the target channel, the local frequency is fixed and reception of that channel continues, identification of selective calling number information proceeds to reception of display message etc., if not matched, change local frequency Then, the radio frequency channel is switched to the next one. In this case, the time required to receive the minimum unit of the transmitted signal requires several 100 ms per channel.

[0003]

In the above-described radio selective call receiver, when a conventional radio frequency channel is searched for, a channel that is not transmitted (not used) or the received electric field strength is extremely weak and the service is provided. Since the reception state is maintained even for the channels that are not in the available state, the search time becomes long, and the time for searching, for example, 16 radio frequency channels reaches several seconds. Therefore, the probability that a receiver will not be able to receive a call even if there is a call to the radio selective call receiver as the receiver enters the battery saving state later, the battery life is impaired, and the longer it takes to search all radio frequency channels. There was a problem that would be high.

It is an object of the present invention to significantly reduce the time to search for multiple radio frequency channels, and therefore the time to determine the desired radio frequency channel to continue receiving, a radio selective call receiver and radio selection. A method of searching a radio frequency channel in a paging receiver is provided.

[0005]

SUMMARY OF THE INVENTION A radio selective call receiver according to the present invention controls an electric field detecting means for detecting a reception electric field strength of a radio frequency channel and a search of the radio frequency channel to determine a target reception channel. The reception channel control means has a reception channel control means, and when the reception electric field strength is below a certain value, the reception channel control means immediately switches the radio frequency channel to be received to the next radio frequency channel, and the electric field strength exceeds the certain value. When the system information does not match, it switches to the next radio frequency channel. When the system information matches, the radio frequency channel being received is determined as the target reception channel.

The above-mentioned receiver also matches the information about the received electric field of the radio frequency channel with the system information.
Having a storage means for storing information about the disagreement together,
That information is used to re-order the search order of the receive channels in subsequent search cycles.

According to another aspect of the present invention, a method of searching a radio frequency channel in a radio selective calling receiver is such that an arbitrary radio frequency channel is set as a reception channel to detect the reception electric field strength and the reception electric field strength is constant. If the value of does not exceed the value of, the setting of the receiving channel is immediately switched to the next radio frequency channel, and if the received electric field strength exceeds a certain value, the system information contained in the receiving channel and the system information held by the receiver are compared. When the system information does not match, the setting of the receiving channel is switched to the next radio frequency channel, and when the system information matches, the receiving radio frequency channel is determined as the target radio frequency channel to continue the reception.

Further, in the above-mentioned search method, information on the received electric field of each radio frequency channel is stored, and information on the match / mismatch of the system information of each radio frequency channel is also stored together, and the information is utilized. Re-specify the order of search for radio frequency channels in subsequent search cycles.

[0009]

When a plurality of radio frequency channels including system information and selective call information are sequentially switched to search for a target radio frequency channel, selection including system information, selective call number information, message information, etc. is made for each channel. Instead of continuously receiving the ringing signal, first detect the reception field strength of the reception channel, and if the level is below a certain level, immediately switch to the next channel, and start when the reception field strength exceeds a certain level. The system information comparison result is checked, and if they do not match, the channel is switched to the next channel, and if they match, it is determined that the channel is the target radio frequency channel, and the process proceeds to reception below the selective call number information.

Further, if the target channel is not determined even after the search for all the channels has been completed in the first search cycle, the process proceeds to the second and subsequent search cycles. In this case, if the information regarding the received electric field for each channel in each search cycle and the match / mismatch of the system information are stored, the search order of the radio frequency channels in the next search cycle, that is, the switching order is re-designated. You can

[0011]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a radio selective call receiver according to a first embodiment of the present invention. The radio selective call receiver of FIG. 1 can receive a selective call signal transmitted by a plurality of radio selective call systems through different radio frequency channels, and includes an antenna 101, a radio unit 102, a demodulation unit 103, a decoder unit 105, Notification unit 106, display control unit 107, display unit 108, system information comparison unit 10
4, electric field detector 109, local frequency generator 110,
It has a reception channel control unit 111.

The antenna 101 and the radio section 102 selectively receive the radio frequency channel corresponding to the local frequency sent from the local frequency generation section 110 controlled by the reception channel control section 111, and demodulate into the selective call signal by the demodulation section 103. Waveform shaped, converted to digital signal,
It is sent to the decoder unit 105 and decoded.

In the decoded selective calling signal, system information for identifying a plurality of radio selective calling systems, selective calling number information assigned to the radio selective calling receiver, and the display section 108 of the receiver are displayed. Contains display information that should be displayed.

The electric field detection unit 109 detects the reception electric field strength of the radio frequency channel received by the antenna 101 and the radio unit 102, and sends it to the reception channel control unit 111.
The reception channel control unit 111 compares the received electric field strength with a predetermined reference value. When the received electric field strength exceeds the reference value, the system information comparison unit 104 determines whether the decoded system information and the system information held by the receiver match in advance, and indicates the match or mismatch. The signal is sent to the decoder unit 105 and the reception channel control unit 111.

If the system information matches, the receiving channel controller 111 fixes the local frequency, and the decoder 105 determines whether the demodulated selective call number matches the selective call number held in advance by the receiver. Is determined and if they match, the decoder unit 105 drives the notification unit 106 and simultaneously displays the demodulated display information on the display control unit 10.
The display information is displayed on the display unit 108.

Next, the search operation of the radio selective call receiver of FIG. 1 which waits for a selective call to the own device will be described with reference to FIG. The radio selective call channel that can be received now is No. 1 to No. It is assumed that there are 16 channels up to 16, and No. It is assumed that the search is performed from 1 in the order of numbers.

When the receiver switches on the receiver, the reception channel control unit 111 causes the local frequency generation unit 110 to display the channel number. 1 is instructed to transmit the local frequency, and the reception channel is set to No. It is set to 1 (step 201). The electric field detection unit 109 connected to the wireless unit 102 detects the received electric field strength (step 20).
2) The reception channel control unit 111 compares whether or not the reception electric field strength is higher than the reference value (step 20).
3).

Here, when the received electric field strength does not exceed the reference value, the reception channel control unit 111 determines that the reception channel is N.
o. Check whether it is set to 16 (step 20
6), No. When it is not set to 16, the reception channel control unit 111 immediately instructs the local frequency generation unit 110 to switch the local frequency, causes the local frequency corresponding to the next radio channel to be transmitted, and sets the reception channel to the next. The channel is switched to the order of (step 207). In addition, when the reception channel is No. When it is set to 16, the channel No. of the second round is set. Starting from No. 1 The search cycle ends in step 16 (steps 206 and 201).

When the received electric field strength is larger than the reference value,
The system information comparison unit 104, which has received the result from the reception channel control unit 111, compares the system information, and outputs the result to the reception channel control unit 111 and the decoder unit 1.
Send to 05.

Here, when the system information does not match (step 204), the reception channel control unit 111 determines that the reception channel is No. Check whether it is set to 16,
No. If it is not set to 16, the instruction to switch the setting of the receiving channel is given (steps 206 and 207), and No.
When it is set to 16, the channel number is set again. Proceed to the second search cycle starting from 1 (step 20
6,201).

When the system information matches, the receiving channel is determined as the target receiving channel (step 20).
4, 205), the reception channel control unit 111 fixes the local frequency through the local frequency generation unit 110, and the decoder unit 105 proceeds to the comparison of the selective call number information.

In this series of search operations, the target receiving channel for which the reception should be continued is not determined, and the receiving channel is No. When the number becomes 16 and the circuit makes one round, the channel number is set again.
Returning to 1, the search cycle of the second cycle is started, and the search operation is repeatedly performed until the target reception channel is determined, or until the number of search cycles reaches a certain number without being determined.

The search order is channel N first.
o. Although it is supposed to be set to 1, the channel number. 1
When the number reaches 6, It is also possible to return to 1 and search from any channel.

Next, the radio selective call receiver of the second embodiment will be described with reference to FIGS.

The receiver shown in FIG. 2 differs from the receiver shown in FIG. 1 in the structure that a channel information storage unit 112 is provided. The channel information storage unit 112 stores the reception electric field strength obtained by the electric field detection unit 109 in the reception channel control unit 111 and the result of comparing the reception electric field strength with a predetermined reference value together with the channel number, and the reception channel The control unit 111 can use the received electric field information stored in the received electric field storage unit 112 in order to more efficiently perform the subsequent search operation in the radio selective call receiver. FIG. 4 shows an example of the search operation procedure including the second and subsequent cycles, which is more effectively performed by utilizing the information stored in the channel information storage unit 112 in the subsequent cycles.

In FIG. 4, the step 303 in which the received electric field information is stored in the channel information storage section 112 is followed by the step 304 in which it is judged whether the received electric field strength is larger than the reference value, and the comparison result of the system information is The step 303 ′ stored in the channel information storage unit 112 is followed by the step 305 of determining whether the received system information matches the system information held by the receiver.

The first search cycle is channel N
o. 1 to channel No. When the process ends up to 16 without determining the target reception channel (step 307), the second search cycle is started. Here, the order of the receiving channels is redesignated so that the operation of the second search cycle is efficiently performed by using the information stored in the channel information storage unit 112 in the previous steps 303 and 303 ′. (Step 309) Then, the radio frequency channel of the first order after re-designation is set (step 310). After that, the search is performed similarly to the first search cycle. When each step of the search is performed for all the channels after the redesignation without determining the target reception channel (step 315), the redesignation for the third search cycle is performed (step 3).
09).

There are two possible methods for respecifying the search order of the receiving channels in step 309. First
In the second method, only the channels whose received electric field does not exceed the reference value in the immediately preceding search cycle are arranged in the order in which the search is performed. Channels whose strength exceeds the reference value and whose system information does not match are added. The latter method is considered effective when the carrier of the selective call receiver is moving at high speed.

The search operation of FIG. 4 is repeated until the target reception channel is determined or the number of search cycles reaches a predetermined number.

[0031]

As described above, according to the present invention, when a plurality of radio frequency channels are sequentially switched to search for a target radio frequency channel, if the reception electric field strength is insufficient, the next channel is immediately switched to the reception electric field. Only when the strength exceeds a certain level, the system information is checked for a match / mismatch, and if there is a mismatch, it is immediately switched to the next channel, and only the channel for which the system information matches is judged as the target radio frequency channel and selected call. By proceeding to the reception of the number information, the time required for the search to determine the target radio frequency channel is significantly shortened, which prevents battery drain and reduces the probability that reception will not be possible even if there is a call. There is. Further, by storing the coincidence or non-coincidence of the received electric field information and the channel information and using them for re-designating the search order in the next search cycle, there is an effect that the next search can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a block diagram of a radio selective call receiver according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a radio selective call receiver according to another embodiment of the present invention.

3 is a flowchart showing a procedure of a search operation of a radio frequency channel in the radio selective call receiver of FIG.

4 is a flow chart showing a procedure of a search operation of a radio frequency channel in the radio selective calling receiver of FIG.

[Explanation of symbols]

 101 antenna 102 radio section 103 demodulation section 104 system information comparison section 105 decoder section 106 notification section 107 display control section 108 display section 109 electric field detection section 110 local frequency generation section 111 reception channel control section 112 channel information storage section

Claims (7)

[Claims] 1. A radio frequency channel of a plurality of radio selective calling systems, which includes system information for identifying a radio selective calling system, is searched, each radio frequency channel is sequentially switched and received, and the system information is transmitted by its own radio. When it matches the system information held by the selective call receiver, the radio frequency channel being received is determined to be the target radio frequency channel for which reception is to continue. The electric field detection means for detecting the strength, and the reception channel control means for controlling the search of the radio frequency channel to determine the target reception channel, the control means, immediately when the reception electric field strength is less than a certain value When the radio frequency channel to be received is switched to the next radio frequency channel and the electric field strength exceeds the certain value Inquires whether the system information matches or does not match, switches to the next radio frequency channel when the system information does not match, and determines the radio frequency channel being received as the target reception channel when the system information matches. Radio selective call receiver. 2. A storage unit for storing information about a reception electric field obtained from the electric field detection unit, wherein the reception channel control unit uses the reception electric field information stored in the storage unit, and wirelessly in a subsequent search cycle. The radio selective call receiver according to claim 1, wherein the frequency channel search order is respecified. 3. A storage unit for storing information on whether the system information matches or does not match, and the reception channel control unit re-specifies the order of radio frequency channel switching using the comparison result of the system information. The selective call receiver according to claim 2. 4. The radio selective call receiver according to claim 1, further comprising a synthesizer as an oscillator that generates a reception local frequency corresponding to the radio frequency channel. 5. A radio frequency channel of a plurality of radio selective calling systems, which includes system information for identifying the radio selective calling system, is searched, and each radio frequency channel is sequentially switched and received, and the system information is self-radio. In the radio frequency channel search method in the radio selective call receiver, which determines that the radio frequency channel being received is the target radio frequency channel for which reception is to be continued when it matches the system information held by the selective call receiver, The radio frequency channel is set to the reception channel to detect the reception electric field strength, and when the reception electric field strength does not exceed a certain value, immediately switch the reception channel setting to the next radio frequency channel, and the reception electric field strength is When the value exceeds a certain value, the system information contained in the receiving channel and the system information held by the receiver are If the system information does not match, the receiving channel setting is switched to the next radio frequency channel, and if the system information matches, the target radio frequency that should continue receiving the radio frequency channel being received. A radio frequency channel search method in a radio selective call receiver characterized by determining a channel. 6. The radio frequency channel search method according to claim 5, wherein information regarding a received electric field of each radio frequency channel is stored, and the information is used to re-specify a search order of radio frequency channels in a subsequent search cycle. . 7. The information on the match / mismatch of the system information of each radio frequency channel is stored, and the match / mismatch information of the system information is further used to re-order the search order of the radio frequency channels in the subsequent search cycle. The radio frequency channel search method according to claim 6, which specifies.