JPS63242034A - Selective radio call system - Google Patents

Abstract

PURPOSE:To utilize a receiver at plural zones by including a zone designation signal to a synchronizing signal so as to give plural numbers to the receiver. CONSTITUTION:A zone designation signal and a frequency designation signal are added to a synchronizing signal for each group. An address signal detection section 3 detects a selective call signal and an address of its own receiver set to a memory 7 is reads from the detected output of a zone designation signal detection section 4, collated by an address signal collation section 6 and the result of collation is outputted. Moreover, a frequency designation signal detection section 5 detects a frequency designation signal the signal is collated with a channel number decided by a zone designation signal by a channel collation section 8 to control a frequency switching control section 9 controlling the frequency switching of the reception circuit 2 to make the frequency coincident with each other. Thus, one set of receiver is used in plural zones and in plural frequencies.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless selective calling system, and particularly to a wireless selective calling system that allows a single receiver to receive services in a plurality of regions. The present invention is suitable for use in a so-called "pocket health" system.

[Conventional technology]

The structure of the paging signal in the conventional radio selective paging system is shown in FIG.

That is, the frame of the calling signal is divided into n groups as shown in FIG. 3(Δ), and the calling signal of each group is divided into one synchronous It consists of a signal and m selective call signals.

The synchronization signal is composed of a bit synchronization signal, a word synchronization signal, and a group synchronization signal, as shown in FIG. 3(C). Each receiver uses an intermittent reception method in which it receives signals by turning on the power only for the time corresponding to its own group.

[Problem that the invention seeks to solve]

However, with these conventional radio selective calling systems, one receiver cannot receive radio paging services in multiple areas, and in order to receive radio paging services in multiple areas, multiple receivers must I needed a machine.

In other words, if you try to make the receiver usable in multiple regions, the combination of group code and group number included in the group synchronization signal must match in the multiple regions where it can be used, since there is no region-specific signal. Must be. In this case, since the system is group-based rather than user-based, it is not possible to deal with diversifying requests for combinations of regions, and the same number, excluding the area code, cannot be used in other regions.

Furthermore, since the frequencies used differ depending on the region, a receiver that can only use one frequency cannot be used in another region, and if you take the receiver to a distant region where the same frequency is used, However, due to duplicate receiver addresses (calling numbers), it could not be used properly.

The present invention solves the drawback that conventionally one receiver could only use one region and one frequency.
The purpose of the present invention is to provide a radio selective calling system that can be used in multiple regions and multiple frequencies even with a single receiver.

[Means for Solving the Problems] The present invention provides a method in which a calling signal is divided into a plurality of groups, and each group of calling signals is composed of a synchronization signal and a plurality of selective calling signals corresponding to each called receiver. In the radio selective calling system in which a base station transmits a called signal, the synchronization signal includes a region designation signal.

The synchronization signal can also include a frequency designation signal.

[Effect]

In addition to the conventional synchronization signals such as bit synchronization signal, word synchronization signal, and group synchronization signal, synchronization signals for each group include:
A region designation signal and a frequency designation signal are added.

The receiver detects a selective call signal unique to its own receiver assigned to each region of use and indicates that there is a call. At this time, the receiver detects the frequency designation signal used in that area, identifies the channel assigned to its own receiver, and receives the signal on the frequency for each area.

〔Example〕

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

FIG. 1 is a signal configuration diagram showing one embodiment of the present invention.

The frame of the calling signal is as shown in FIG. 1(A).
It is composed of subframes for each group of n. As shown in FIG. 1(B), this subframe is composed of a synchronization signal and m selective call signals.

The structure of this synchronization signal is a feature of the present invention; in addition to the same bit synchronization signal, word synchronization signal, and group synchronization signal as the conventional synchronization signal, a region designation signal and a frequency designation signal are newly added. There is.

The selective call signal is composed of an address signal specifying the address of each receiver and a message signal, as shown in FIG. 1(D).

In this embodiment, the number of groups n is 15, and the group synchronization signal, area designation signal, and frequency designation signal are each 4.
The minimum unit of the address signal and message signal of the selective call signal is a (31, 16) BCH code.

At this time, each group can be numbered 2-6, that is, about 60,000, and the area designation signal can accommodate up to 24 = 16 areas, and the frequency designation signal can have the same <2'
=16 frequencies can be accommodated.

Table 1 shows the correspondence between the group code and group number of the group synchronization signal in this embodiment, Table 2 shows the correspondence between the region designation code and region of the region designation signal, and Table 2 shows the correspondence between the frequency designation code of the frequency designation signal and the channel. The correspondence is shown in Table 3.

(The following is the margin of this page) By selecting each of the group synchronization signal, region designation signal, and frequency designation signal from the correspondence tables shown in Tables 1 to 3 above, signals of multiple regions and multiple frequencies can be received. Can be done.

Next, FIG. 2 shows the configuration of a receiver used in an embodiment of the present invention.

In this receiver, a receiving circuit 2 receives radio waves received by an antenna 1, and the output thereof is given to an address signal detecting section 3, an area specifying signal detecting section 4, and a frequency specifying signal detecting section 5. The address signal detection section 3 detects the selective call signal, reads out the address of the radio transmitter set in the memory 7 based on the detection output of the area designation signal detection section 4, and collates it with the address signal comparison section 6. Output the matching results.

Further, the frequency designation signal detection section 5 detects the frequency designation signal, and controls the frequency switching control section 9 that controls the frequency switching of the receiving circuit 2 by comparing the frequency designation signal with the channel number determined by the area designation signal in the channel matching section 8. to match the frequencies.

Next, this embodiment will be explained by giving a specific example.

For example, assume that Tokyo uses the first channel and second channel, Osaka uses the same second channel as Tokyo, and Chiba uses a third channel that is different from Tokyo. The receiver of this embodiment can receive from the first channel to the third channel, and different addresses are given for each region in Tokyo, Osaka, and Chiba, and the frequency in Tokyo is the first channel, and the frequency in Osaka is different. Now, the second channel,
It is assumed that the third channel is assigned in Chiba.

In Tokyo, the receiver detects the region designation code <010 of the region designation signal included in the synchronization signal in the region designation signal detection unit 4.
0), the address assigned in Tokyo is read from the memory 7, and when the address signal matching unit detects its own address signal from the selective call signals of its own group, it outputs that there is a call. . Similarly, in Osaka, the area designation code (,1011) is detected, and the address assigned in Osaka is read and verified.

Similar actions will be taken in Chiba.

Further, since a frequency designation signal of a frequency used in the area is transmitted from the base station as a synchronization signal, this is detected by the frequency designation signal detection section 5. A channel matching section 8 matches the channel number determined by the detected frequency designation signal and the channel number determined by the area designation signal.

Based on the comparison result, the frequency switching control section 9 switches the frequency of the receiving circuit 2 to match the channel used in that area.

For example, even if you leave the frequency specified for the first channel in Tokyo and take it to Chiba without changing the frequency, that channel will not be able to detect the calling signal from Chiba, which uses the third channel. Unable to call by number. Therefore, in such a case, the frequency is manually changed to the third channel, which is the Chiba channel. At this time, if you accidentally specify the receiver's frequency to the second channel, Chiba can also receive Tokyo's second channel, so it will detect the Tokyo area designation signal, but it will not be able to detect the selective calling signal within that channel. I can't call you either in Tokyo or Chiba.

At this time, in order to correctly set the frequency of the receiving circuit 2 to the third channel, the channel verification section 8 verifies the channel and displays a warning to the user that the channel number is incorrect, and indicates that the channel number should be received in Chiba. Control switching to the correct third channel.

〔Effect of the invention〕

As explained above, the present invention has the advantage that a single receiver can be assigned multiple numbers and used in multiple regions.

[Brief explanation of drawings]

FIG. 1 is a signal configuration diagram of an embodiment of the present invention. FIG. 2 is a configuration diagram of an embodiment receiver. FIG. 3 is a signal configuration diagram of a conventional example. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Receiving circuit, 3... Address signal detection part, 4... Area designation signal detection part, 5...
Frequency designation signal detection section, 6...address signal verification section,
7...Memory, 8...Channel matching section, 9...Frequency switching control section.

Claims (2)

[Claims] (1) Radio in which the calling signal is divided into a plurality of groups, and each group's calling signal is composed of a synchronization signal and a plurality of selective calling signals corresponding to each called receiver, and the calling signal is transmitted from the base station. A wireless selective calling system, wherein the synchronization signal includes a region designation signal. (2) The wireless selective calling system according to claim (1), wherein the synchronization signal includes a frequency designation signal.