JPS6128232A - Selective call system - Google Patents

Abstract

PURPOSE:To display visually a message corresponding to reproduced type information by using a specific bit in individual number code as a function code, assigning type information of the message and calling and decoding the function code at its generation. CONSTITUTION:A selective call signal consists of a conventional BCH code, the individual number code of the information bit is taken as 12-bit and a function code F is inserted to the remaining 4-bit. After the selective call signal received by an antenna 1 is reproduced by a radio circuit 2 of the receiver, and subject to 1-bit error correction at an error correction operating circuit 3 and its output signal is led to a control circuit 10. A collation means 11 collates an individual number code in an output signal of the error correction operating circuit 3 with the own individual number code recorded in a ROM5 and when the both are coincident, a ring tone is generated. Further, the function code in the output signal of the error correction operating circuit 3 is decoded by a decoding means 12 to reproduce the type information and when the coincidence of the individual number code is detected by the collation means 11, a message generating means 14 is operated to output the message information corresponding to the type information and displayed on a liquid crystal display device 9 via a drive circuit 8.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an improvement in a selective calling method.

[Technical background of the invention]

Conventionally, the following selective calling methods are known. That is, as shown in FIG. 1 (al to (c)), one frame for each zone is
5), these groups are further time-divided into a synchronization word and a plurality of call words (1 to 8 in the figure), and a selective call signal is inserted into each of these call words and transmitted from the base station. . Here, the selective calling signal generally consists of 16 bits of information into which an individual number code is inserted.
How many 5-bit check bit books did you buy? The so-called (31
．． 16) Consists of BCH codes. As shown in FIG. 2, the selective calling signal sent from the base station is first received and reproduced by the radio circuit 2 via the antenna 1 in the receiver, and the reproduced signal is transmitted to the error correction calculation circuit 3. Then, the corrected individual number code is compared with the own individual number code stored in advance in the ROM 5 in the matching circuit 4, and when the two match, it is determined that a call to the self has occurred. Recognize and send 1ji signal to speaker 7 via amplifier circuit 6? This generates a ringtone.

By the way, in recent years, in this type of system, in addition to the individual number code, information bits in which the entire message code is inserted are transmitted, and when the individual number code of this information bit matches the own individual number code, a ring tone is generated, and A system for visually displaying the message code has been proposed. If this system is realized, it will be possible to display a message such as "6 KAISHIYANIDENWISEYO" on each receiver, which will be extremely convenient for university players.

[Problems with the background art] However, since this type of system inserts the entire message code in addition to the single individual number code, the number of bits of the selective call signal increases and the system itself is changed to a completely new one. This was difficult to achieve under the current circumstances.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a selective calling system that is capable of transmitting and displaying messages by only changing a part of the existing system, has low equipment costs, and is highly functional.

[Summary of the invention]

In order to achieve the above object, the present invention uses a specific bit of the individual number code as a function code, assigns a t# information indicating the type of message to this code, and transmits it from the base station, and the receiver Number code? It compares and matches its own area number, and when the two match, it calls and displays that fact, and at the same time decodes the function code and reads out the message corresponding to the type information as a result of decoding from all memories and visually displays it. This is what I did.

[Embodiments of the invention]

FIG. 3 is a schematic configuration diagram of a selective call signal to which a selective call system is applied in an embodiment of the present invention. This selective call signal consists of the conventional (31, 16) BCH code, with the individual number code of the information bits being 12 bits, and the function code F'ft inserted into the remaining 4 bits.

At this time, the function code Fi- is inserted at the head position of the clearing bit.

On the other hand, FIG. 4 shows the configuration of a selective calling receiver to which the selective calling method of the present embodiment is applied.This receiver reproduces the selective calling signal received by the antenna 1 in the radio circuit 2, and then performs an error correction operation. One-bit error correction is performed in circuit 3, and its output signal is introduced into total control circuit 1θ. This control circuit 10
is a collation means 11 and a function code decoding means 1.
2, a memory 13 storing six types of message information, and a message generating means 14. This message generating means 14 is.

Message information corresponding to the message type information obtained by the decoding means 12 is read out from the memory 13 and output. and.

In the receiver, the matching means 11 matches the individual number code of the output signal of the error correction calculation circuit 3 with its own individual number code stored in the ROM 5.

When the two match, the speaker 1 is output through the amplifier circuit 6t.
generates a sound. (9) At the same time, the receiver decodes the function code of the output signal of the error correction calculation circuit 3 using the decoding means 12 to reproduce the type information, and when the matching means 11 detects a match between the individual number codes. Then, the message generating means 14t is operated to output message information corresponding to the type information. This message information is then displayed on a liquid crystal display 9 via a drive circuit 8.

Next, a specific example of the selective calling system of this embodiment will be explained based on one or more configurations. First, as shown in FIG. 5, when the caller dials the calling number ``525-2599-5'' from the subscriber telephone, the base station first obtains the individual number code ``04!599'' from the calling number and converts this code into It is converted into a binary symbol according to the numbering plan table shown in Table 1. At the same time, the message type information '5''i is directly converted into a function code consisting of a binary symbol. Then, the first 4 of the individual number codes (16 bits)
Delete the bit and replace the above function code (
4 bits) are all inserted, used as information bits, and sent after adding 15 bits of check pit money to the information bits.

On the other hand, when the selective calling receiver receives and reproduces the selective calling signal as shown in FIG. 6, it first performs error correction on the individual number code (12 bits), and if the error is 1 bit or less, a control circuit 10Tlc is introduced. Then, the matching means 11 compares and matches the individual number code with its own individual number code, and if the two match, a ringing is generated, and at that time, the function code is decoded by the decoding means 12, and the resulting type information ''' The message information corresponding to 5'1 is read from the memory 13 and displayed on the liquid crystal display 10.The above type information and message information are correlated as shown in Table 2, for example.In other words, the type information ``1'' to ``8'' are associated with fixed phrases such as ``Kaishanidenwa'', and 9' and ``'0''.

■", 'su" are associated with message information arbitrarily set by the subscriber. The message information set by the subscriber is written by the subscriber in the memory of the control circuit 10. Among the function codes, "0000", "111"
0”.

1111" is not used, and 1101" does not display anything.

Therefore, as described above, when the type if report "5" arrives, the display 9 will display the fixed text corresponding to the above "5".

Table 2 The following problems arise. That is, in recent years, the same radio wave frequency has been used between zones in order to make effective use of radio waves. In such systems, if a receiver that has entered another zone is called using the same individual number code as the receiver, a false call occurs.

For this reason, conventionally, for example, each group GK, ~.

Each group corresponds to GIl)'GC1e~.

GCll, and set these group codes to each zone as shown in Table 3, 1, . Eri to make the difference between 11 and erroneous call in other zones? I'm trying to prevent it. However, if the individual number code is tl-12 bits as in the above embodiment, and if there are 2,000 subscribers in one group, there will be receivers with the same individual number code in each group in the zone. It will exist.

In this way, if the same number exists within the zone.

As long as the receiver exists within its own zone, it will not cause an erroneous call by determining the group codes GC, ..., GCtst, but if it enters another zone, it will not cause a false call. However, since there is always a subscriber with the same individual number code, there is a risk that erroneous calls may occur.

Table 3 Therefore, in another embodiment of the present invention, the above problem is dealt with in the following manner. Figures 7 to 10 are for detailed explanation of the present invention, which has means for solving the same problem.
The same parts as those in the previous embodiment are omitted. In other words, this method creates a different scramble code (4 bits) for each group based on the individual number code, and performs an exclusive logical operation on this scramble code on the first 4 bits of the check bits and the following 4 bits. It is assigned by the base station and transmitted from the base station. After receiving the transmitted selective call signal, the receiver performs an inverse logic operation on the scramble code created within the receiver and reproduces it as a selective call signal. This is used for checking against the code.

Here, the scramble code is created, for example, as follows. That is, each group G 1 # to #
The number of receivers for G111 is 2ooo.

The MSB 5 bits of the individual number code are of two types for each group, with the exception of group Gs'ft, as shown in Table 1 above. Therefore, for example, as shown in Figure 7 (
, pay attention to the 5th bit of the code of M8B5 bits, and calculate this 5th bit.
If the bit is 11", '0001' is added to the MSB 4 bits.
" is added and the result is used as a scramble code. On the other hand, if the 5th bit is @O", the M8B4 bits are used as is as a scramble code. However.

The scramble codes for each crew 7" 01 e~, G Fazeyuki are as shown in Table 1.

In order to send out a selective call signal with the above-mentioned scramble code added, an individual number code and a function code are first created for the call from the caller as shown in FIG. Next, after creating a scramble code as shown in FIG. 7, this scramble code ``0001'' is subjected to an exclusive logical operation on the first 4 bits of the check bits and the following 4 bits, respectively, as shown in FIG. The base station then transmits the information.

On the other hand, the receiver has a scramble code calculation circuit (SC calculation circuit) 21 and an inverse calculation circuit 20, as shown in FIG. When the selective calling signal is received by the radio circuit 2 via the antenna 1, the %SC calculation circuit 21 generates its own scramble code based on its own individual number code stored in the ROM 5 according to the means shown in FIG. is created, and this scramble code is subjected to an inverse logic operation on the selective call signal as shown in FIG. 10 in an inverse logic operation circuit 20. Then, the selective calling signals thus reproduced are compared and verified by the means shown in FIG. The number is displayed on the liquid crystal display 9.

If it is a similar method, it is the same as the previous embodiment.

It is possible to set a function code in the information bit and allocate each message information to the code and send it separately, thereby further improving serviceability. In addition, since there is no need to assign a large number of individual number codes to the receiver, the capacity of the ROM can be small, and only one matching circuit is required, so the circuit configuration can be simplified to 1 m and an inexpensive receiver can be obtained. can be provided. Furthermore, by adding a scramble code, it is possible to reliably prevent erroneous calls due to the reduction of the individual number code from 16 bits to 12 bits, and it is possible to perform all selective calls with high performance and high reliability. In addition, since scramble records are assigned in two places at this time, erroneous calls may occur even if there are two groups with a 1-bit error correction in the case of a receiver that performs 1-bit error correction. This allows for more reliable calls.

Note that the present invention is not limited to the above embodiments.
For example, the function code may be 5 bits,
In this way, the types of messages can be further increased.

Furthermore, if there is no need to increase the number, the function code may be set to 3 bits or less.

In addition, as a visual display, a light emitting diode or the like may be used in addition to a liquid crystal display.Furthermore, the scramble code may be added to information bits in addition to check bits.
The position may be set in any way, and the number of scrambling bits, logical operation method, whether or not to add a scrambling code, etc. may be modified in various ways without departing from the gist of the present invention. can.

〔Effect of the invention〕

As described in detail above, the present invention uses a specific bit in an individual number code as a function code.

Message type information is assigned, this function code is decoded when a call occurs, and a message corresponding to the reproduced type information is visually displayed.

Therefore, message transmission and display can be performed by simply changing a part of the current system, and a highly functional selective calling system can be provided with low equipment costs.

[Brief Description of the Drawings] Figures 1 (a) to (cl) and Figure 2 are for explaining the conventional selective calling method 1. Figure 1 is a schematic diagram showing the signal configuration of the same system, FIG. 2 is a block diagram of a selective calling receiver to which the same method is applied. FIGS. 3 to 6 are for explaining the selective calling method in an embodiment of the present invention. FIG. Schematic diagram showing the configuration of the selective call signal, No. 4
FIG. 5 is a block diagram of a selective call receiver to which the same system is applied, FIG. 5 is a diagram showing a control procedure of a base station, and FIG. 6 is a diagram showing a control procedure of a selective call receiver. 7 to 10 are for explaining the selective calling system in another embodiment of the present invention, FIG. 7 is a flowchart showing the scrambling code creation operation, and FIG. 8 is a flowchart showing the base station control procedure. FIG. 9 is a block diagram of a selective calling receiver, and FIG. 10 is a diagram showing a control procedure of the receiver. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Radio circuit, 3... Error correction calculation circuit, 5... ROM, 6... Amplification circuit, 7...
...Speaker, 8...Drive circuit, 9...Liquid crystal display %10...Control circuit, 11...Verification means, 12...
・Decoding means, 13...Memory, 14...Message generating means, 20...Inverse logic operation circuit, 21...Scramble (SC) operation circuit・

Claims (2)

[Claims] (1) A base station transmits a selective call signal consisting of an information bit into which an individual number code is inserted and a check bit determined by this information bit, and a receiver receives this selective call signal and receives the individual number code. In the selective calling method, which compares the number with its own individual number and displays a call when the two match, the base station uses a specific bit of the individual number as a function code, and assigns the type of message to this function code. When the receiver receives this selective call signal and its individual number code matches its own individual number code, it makes a call and decodes the function code to determine its type. A selective call method characterized by visually displaying a predetermined message corresponding to information. (2) Among the plurality of messages predetermined corresponding to the type information, some of the messages can be arbitrarily set by the subscriber.
Selective calling method described in section 1).