JPH0955970A - Selective radio call receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically set a presently existing area from among areas received in advance in the case of starting communication by providing respec tively specified memory dedicated to programmable reading, a decoder and a control part. SOLUTION: The decoder 5 selects on of plural receiving channel code numbers previously written in the memory dedicated to programmable reading 6 and makes a radio part 2 detect searching operation which selects one of plural receiving frequencies until the acquisition of synchronism by the receiving frequency so as to correspond to the receiving channel code number. Then when the acquisition of synchronism is detected and its own calling number and a signal from a waveform forming part 4 coincide with each other, the decoder 5 sends a message signal showing the incoming of calling. A control part (MPU) 7 decodes the message signal, displays a message on an LCD display part 9 and rings a speaker 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective calling receiver having a function of automatically setting a service area.

[0002]

2. Description of the Related Art The service area of a conventional radio selective call receiver is usually in units of prefectures. However, when a multi-area service is used, the area where calls can be received is the basic area (home area). In addition, you can receive services by adding several places as sub areas. FIG. 3 shows an example of the outline of the multi-area service. As shown in the figure, when the area A1 is the home area and the area A2, the area A3, and the area A4 are combined as the sub-area and four areas are contracted as a multi-area, no matter where they move among these four areas, Can be called.

[0003]

[Problems to be Solved by the Invention] However, in this way,
In order to receive a call in each area, the user sets the reception channel number for setting the area identification number and the channel number of the frequency to be received, which is used to identify the position that is registered in advance in the receiver in area units. It must be registered and set in the base station in the area to be used. That is, each time the user moves the area, the user has to perform a troublesome operation of operating the switch by switching to the reception area number of the area where the user is currently located, which is registered and set in advance. It was

[0004] An object of the present invention is to solve the above problems,
It is an object of the present invention to provide a radio selective call receiver having an auto-scan function that can automatically set an area currently in service from areas registered in advance when communication is started.

[0005]

In order to achieve this object, a radio selective call receiver according to the present invention is a radio selective call receiver used in a multi-service area, and an antenna for receiving a radio signal, A radio unit for selecting one of a plurality of reception frequencies assigned to the multi-service area, receiving from the antenna, amplifying and demodulating, a waveform shaping unit for converting the waveform of the signal demodulated by the radio unit, A programmable read-only memory for storing a plurality of reception channel code numbers respectively corresponding to a plurality of reception signals and its own calling number, and a plurality of the reception channel code numbers previously written in the programmable read-only memory One of the reception channels is selected by the radio unit so that one of them is selected and the selected reception channel code number is applied. A search operation for selecting one of the numbers is performed up to the detection of the synchronization pull-in by the reception frequency, and the synchronization pull-in is detected, and the own calling number and the signal from the waveform shaping section are compared, and both numbers And a control unit for decoding the message signal transmitted from the decoder and performing a required visible and audible display. There is.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In detecting the synchronization pull-in, the decoder may be configured to detect that an electric field level equal to or higher than a prescribed value necessary for maintaining stable communication at the reception frequency is obtained. it can. A region identification number of the multi-service area is further stored in advance in the programmable read-only memory, and the decoder stores the region identification number and the region identification number coming from a base station of the service area after detection of the synchronization pull-in. It can be configured to proceed to the sending of the message signal through a match test with the identified area identification number.

[0007]

1 shows an example of the configuration of a radio selective call receiver according to the present invention, in which 1 is an antenna for receiving radio signals,
2 sets the receiving frequency automatically by the synthesizer 3,
A wireless unit that amplifies and demodulates a wireless signal from the antenna 1. Reference numeral 4 denotes a waveform shaping unit that converts a signal demodulated by the wireless unit 2 into a waveform that can be read by a decoder 5, which will be described later. And a signal from the waveform shaping section 4, and when the numbers match, a message signal indicating that there is a call is sent out following the call signal. The programmable read-only memory 6 is further pre-registered with a plurality of reception channel code numbers assigned to the service area of the radio selective calling receiver. The radio section 2, the synthesizer 3, the waveform shaping section 4, and the decoder 5 form a synchronous loop. A decoder 7 decodes the message signal sent from the decoder 5, judges the end of the message signal and sends a signal sending stop command to the decoder 5, and sends the decoded message signal to a random access memory (RA).
M) 8 is a control unit (MPU) that stores the information in the message stored in the LCD display unit 9 and displays a message information on the LCD display unit 9 while sending a sound signal to the speaker 10. Figure 2 (a)
(B) and (c) are flowcharts showing embodiments of the operation of the auto scan function of the present invention.

In FIG. 2A, first, step (1)
Then, the wireless unit 2 enters the state of starting the automatic scan, and subsequently, in step (2), the decoder 5 is set to an arbitrary receiving channel number from a plurality of receiving channel numbers registered in the P-ROM 6 in advance. Next, step (3)
When the sync pull-in detection operation in the sync loop is performed and the sync pull-in is detected, it is considered that the auto scan operation is completed, and the reception signal waiting state of step (4) is set. If the synchronization pull-in cannot be detected, from among the registered multiple reception channel numbers,
A number other than the reception channel number set in step (2) is reset, and in step (3), a synchronization pull-in detection operation is performed until the synchronization is fixed.

In FIG. 2B, first, step (11)
The auto scan starts. Then, in step (12), an arbitrary reception channel number is set in the decoder 5 from the plurality of reception channel numbers registered in the P-ROM 6 in advance, and in step (13), the waveform shaping section 4 sets the electric field. Perform level detection. If the electric field level above the specified value required for stable communication cannot be detected, the step (1
The numbers other than those set in 2) are set again in the decoder 5, and the operation of step (13) is repeated until the electric field level above the specified value is detected. When the electric field level equal to or higher than the specified value is detected, in the next step (14), the synchronization pull-in in the synchronization loop is detected, and when the synchronization is detected, as shown in step (15). The auto scan operation is considered to be completed, and the reception standby state is entered. Also, if no synchronization is detected,
Returning to step (12), the same operation as described above is repeated until the synchronization is detected.

FIG. 2C shows a method that can be carried out when the information of the area identification number is transmitted from the base station. In this case, the area identification number is further stored in the P-ROM 6. The operation from steps (21) to (23)
Similar to FIGS. 2A and 2B, in step (23), when the synchronization pull-in in the loop is detected, in step (24), the area identification number from the base station is transmitted to the wireless unit 2. Is detected by the waveform shaping section 4 and supplied to the decoder 5, and the area identification number set in the decoder 5 from the P-ROM 6 in step (25) is compared and compared with the area identification number detected in step (24). If the numbers match with each other, the reception standby state is entered. If the numbers do not match, the process returns to step (22), and the same operation as described above is performed thereafter until the numbers match.

[0011]

As described in detail above, by implementing the present invention, a multi-area service subscriber can adopt a configuration in which a single switch is used for both power-on and auto-scan operation. , Because it becomes possible to switch the area with a simple switch operation,
Operability is improved. Further, by performing the area switching only when the area is changed, it is possible to save the unnecessary auto-scan operation, suppress the current consumption, and extend the battery life.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the embodiment of the present invention.

FIG. 3 is a block diagram for explaining a conventional multi-area service.

[Explanation of symbols]

 1 Antenna 2 Radio part 3 Synthesizer 4 Waveform shaping part 5 Decoder 6 Programmable read only memory (P-ROM) 7 Control part (MPU) 8 Random access memory (RAM) 9 LCD display part 10 Speaker

Claims (3)

[Claims] 1. A radio selective call receiver used in a multi-service area, wherein an antenna for receiving a radio signal and one of a plurality of reception frequencies assigned to the multi-service area are selected from the antenna. Receive and amplify,
A radio section for demodulation, a waveform shaping section for converting the waveform of the signal demodulated by the radio section, and a programmable memory for storing a plurality of reception channel code numbers and own call numbers respectively corresponding to the plurality of reception signals. A read-only memory and one of the plurality of reception channel code numbers written in advance in the programmable read-only memory are selected, and the plurality of the plurality of reception channel code numbers are assigned to the radio unit so as to correspond to the selected reception channel code number. A search operation for selecting one of the reception frequencies is performed up to the detection of the synchronization pull-in by the reception frequency, and the synchronization pull-in is detected, and the own calling number and the signal from the waveform shaping section are compared, and both of them are detected. A decoder that sends a message signal indicating that a call is made when the numbers match, and a decoder that sends the message signal A radio selective calling receiver having a control unit for decoding the displayed message signal and performing a required visible audible display. 2. The decoder is configured to detect, when detecting the synchronization pull-in, that an electric field level equal to or higher than a specified value necessary for maintaining stable communication at the reception frequency is obtained. The radio selective call receiver according to claim 1, which is characterized in that. 3. The programmable read-only memory further prestores an area identification number of the multi-service area, and the decoder receives the area identification number from the base station of the service area after detecting the synchronization pull-in. 2. The radio selective calling receiver according to claim 1, wherein the radio selective calling receiver is configured to proceed to the transmission of the message signal after a match test between a number and the previously stored area identification number.