JPS60140938A - Individual selective call receiver - Google Patents

Abstract

PURPOSE:To obtain an individual selective call receiver by handling a message signal and an address signal with the same code so as to suppress the increase in the scale of hardware and the decrease in the subscriber capacity to a small value. CONSTITUTION:The signal architecture as shown in Fig. is considered as a selective call signal with message, where ''S'' is address information and D1, D2 indicate message information. In this example, a BCH (31, 21)+1(even parity) code is used for both the address and the message signal taking the transmission of numeric information in 10 digits and nearly 1,000,000 of address code capacity into consideration. This is because the signal detecting processing is unified and the scale of the detector is decreased by adopting a common code. The message signal consists of the BCH (31, 21) being one of a cyclic code by the same code as that of the address signal and the numeric information is handled by a pure binary code, then plural bits produced by being handled with the BCD code are used for other functions, thereby utilizing time effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a selective call receiver capable of receiving message information.

In recent years, there has been remarkable progress in integrated technology, and as a result there has been an increasing demand for selective calling receivers to have multiple functions, one of which is not only the ability to receive individual selective calling numbers.

Receivers that can also receive message information are being developed.

However, adding message information to the selective call signal in this way does not only affect the scale of the decoder on the receiver side that processes it.

It also has an impact on the subscriber capacity of the system.

i.e. by adding message information.

The number of bits occupied by one subscriber increases, and a decrease in subscriber capacity is unavoidable if the transmission speed is kept constant. So, here's one way to solve this problem.

It is conceivable to increase the signal transmission speed in response to an increase in the number of occupied bits, but this has the disadvantage that sensitivity deteriorates as the speed increases and a wide band is required.

The object of the present invention is to overcome the above-mentioned problems.

It is an object of the present invention to provide an individual selective calling receiver that can receive message information while suppressing an increase in the hardware size of the receiver and a decrease in subscriber capacity.

According to the present invention, there is provided a radio receiving means for receiving a carrier wave modulated by a calling signal consisting of an individually selected calling number and message information, and demodulating the signal.

means for waveform-shaping the output signal of the radio receiving means and determining its code; and receiving the detection output of the code determining means.

In an individual selective calling receiver configured to include means for notifying this and displaying the contents of the signal, the individual selective calling number and the message information constituting the calling signal are each encoded in the same code group. and the message information has an information area composed of a first information block and a second information block that controls information in the first information block, and the code discriminating means detects the paging signal. An individual selective calling receiver is provided, comprising: a means for detecting a message; and a means for receiving message information having the information area from an output detected by the detecting means and decoding the signal. It will be done.

Next, an individual selective calling receiver according to the present invention will be explained with reference to the drawings.

First, prior to explaining the embodiments, a method of handling message information applied to the present invention will be described.

Among message information, numeric information can be handled in two ways: a BCD code method and a pure binary method. For example, when sending 10-digit numerical information,
Comparing the number of bits required for each encoding, the method using Bc+j code requires 4 bits per digit as shown in Table 1, so for 10-digit numerical information,
40 bits are required. Also, in the method using pure binary code.

Table 1 1 to convert a 10-digit decimal number to binary, there.

If the required number of bits is X, then 2X>1010.

Therefore, X〉34. That is, 34 bits and 10 digits (5) You can send numerical information.

As is clear from the above, in a system that only sends numeric information, the message information is handled in pure binary.For example, when sending 10-digit numeric information, it is necessary to It can be seen that the number of bits can be reduced by 15%. and.

This reduction has the following effectiveness.

1.) By adding message information, a decrease in subscriber capacity will be inevitable unless the transmission speed is increased, but BCD
Compared to the case where a code is used, the amount of decrease in subscriber capacity can be reduced.

2.) Functionality can be improved by using the reduced number of required bits as other information compared to the case of using a BCD code.

Next, there are two possible methods of handling message information: a method in which the address signal and the message signal are handled with different codes, and a method in which the address signal and the message signal are handled with the same code. First, when handling message information with a code different from address information, the first point must be taken into consideration (6).

(1) When performing error detection and correction, since the code is different from the address signal, separate decoder hardware or software is required for the address signal and message signal, which increases the scale and the equipment. It goes against miniaturization.

(2) The time occupied by message information is constant regardless of the amount of information.

(3) On the transmitting side, separate encoding codes or software are required for address signals and message signals due to encoding.

The scale and amount of money increases.

On the other hand, when handling message signals and address signals with the same code, consideration must be given to the following points.

(1) As the amount of information increases, the number of words required as a message signal increases.7. If a code with a high coding rate is not selected, the time taken up by one subscriber will be long, and the subscriber capacity will be reduced.
Or it becomes necessary to limit the size of information.

(2) Since the processes of error detection, correction, encoding, and decoding can be shared, the scale of hardware or software can be reduced, and the device can be downsized.

(3) The number of information words can be increased or decreased depending on the amount of information, allowing effective use of one hour.

For example, as an address signal, BCH (31, 21
) to send about 10 digits of numerical information as message information.

When handling 10-digit numerical information with BCD code, 40 bits are needed purely as information bits, and when handling with pure binary code, 34 bits are needed purely as information bits. When used, 2 words are required, total 3 words including address signal.
It becomes a word (=93 bits). On the other hand, if you use a code different from the address information for the message information, use the same cyclic code as the address information, and select the inter-code distance of II 53H, BCH (63, 49) etc. may be used, but the address signal will not be included. The number of occupied bits is 94, which is almost the same as when the codes are the same as described above. Therefore, in consideration of miniaturization of the device and effective use of time, it is better to use the same code for the address signal and the message signal.

As an example of a signal configuration applied to the present invention, a message signal is treated with the same code as an address signal, and the information bits of the message signal are treated as pure binary, and the resulting reduced bits are used for other functions. The case where the information is used as information will be described below with reference to two drawings.

FIG. 1 shows the overall signal configuration.

In this figure, part A is activated by detecting this signal when the receiver is in battery saving state.
This is to temporarily release the power.

Generally, this is called a prefix signal, and in an example of a one-line configuration.

The repeating pattern of logic 1 and 0 was approximately 1 sec.

In addition, part B sends a signal (9 ) number. In this example, it is made up of one of the codes that make up the engineering section. The first part is an information part, which is composed of address information and message information. here,
The engineering section is divided into four groups as shown in Figure 2, and each group is divided into four groups as shown in Figure 3.
Consists of 0 information words. The details of the above-mentioned signal structure are described in the patent application filed by the present inventor entitled "Individual Selective Call Receiving Method 2" (Japanese Patent Application No. 55-39038).

Now, a signal configuration as shown in FIG. 4 can be considered as a selective call signal with a message. Here, S″′ represents address information, and DI and D2 represent message information. In this example, the address signal is BCH (31, 21
)+1 (even parity) was used. This is because by using a common code, the signal detection processing can be unified and the scale of the detector (10) can be reduced.

As example 1, if the message information is 01-6383,
The corresponding message word is.

(MSB) (LSB) F DII CK. In addition, as an example 2, the message information is 123-4
56-7890, the corresponding message word is.

(MSB) (LSB) F DII CK DI2 CK becomes.

FIG. 5 shows the code structure of the address signal which is the "uS" part in FIG. 4. This is the subscriber number of the 9 selective call receiver, and "s7" is the information area.

"'CK"' indicates a check area. And, these are as mentioned above ("BCH (31, 21) + I J code, but it is a system in which two systems receive address information and message information, and two types of information are processed with the same code. Therefore, it is necessary to identify whether the received code is address information or message information by a part of the code.The reason is that address information is P-RO
M (Programmable Readonly
This is a process to confirm the match with the code written in the memory (Memory), whereas detection of message information starts from the moment the address information is detected, and there is no way to know what will be sent. This is because the process involves decoding and confirming what information it is. Furthermore, as is clear from Fig. 4.

The only signal that enters the information word area in Figure 3 is II S.
.

II S and Dl” and “S and D 1, D 2”
There are three letters for the case. In this example, r BCH(31
,21)+1' (even power)' code M
SB (Mo5t 51gn1ficantBtt)
Using 1 bit, address information is logical IQJI.

The message information is logical °'1"'. As a result, the information area °'sz'" is 20 bits, approximately 100 bits.
You can set up to 10,000 addresses. In addition, for 1-bit even parity, the BCH (31, 21) code has an inter-symbol distance of "5", but by adding 1 bit to the end of the code, the inter-symbol distance is set to "6#" and the misconnection rate is reduced. It has the function of making it smaller.

6 and 7 are DI in FIG. 4.

This is the message code corresponding to D2. As mentioned above (
, one bit of MSH is an identification bit 91, which is logical tl 14 in this example. Also, the information bits of one word are 20
Since it is a bit, 34 bits are required to send 10-digit numerical information, so 2 words are required for message information. but.

Even if 34 bits are used for 10-digit numerical information, 6 bits remain. This is section F in FIG.

Here, we would like to utilize section F as another information area.

The message code is fixed as shown in FIGS. 6 and 7. That is, since "DII" is 14 bits, 0 to 1
When sending numerical information up to 6383.

Only one message word is required (two words are required only when sending numerical information of 16384 or more.

(13) Fig. 8 shows section F in Fig. 6, but in this example, in order to actively utilize this area, it is called the function area and is divided into three parts as shown in Fig. 9.

That is, it is divided into I(, J, and K. Of these, the H part consists of 1 bit, and 0" is placed at the beginning of the numerical information series.
Decide whether to add . If you add 0”, it is logic”
If "0" or "0#" is not added, it is represented by a logical "1".

The 5th part consists of 3 bits, and as shown in Figure 9, 1
Determines whether to insert the symbol "par" in the positions of white arrows 1 to 6 between the digits of numerical information consisting of 0 digits L11, L21..., Llo.If the 3 bits are "o o o", the symbol " -” is not inserted.

``001'', ``010'', '011'', ``100''
", '101' and °'111' insert the symbol "1%" at the positions of arrows 1 to 6, respectively. In addition, the second part is composed of 2 bits, and the symbol "-" is placed between the digits of the numerical information consisting of 10 digits shown in FIG.
Decide whether or not to insert ". 2 bits" o o
'''(14) Insert No. ``-''.

FIG. 10 is a block diagram showing the configuration of an embodiment according to the present invention to which the above signal configuration is applied. In this embodiment, when the power switch 20 is closed and the power source 27 is applied to the decoding/control circuit 24, the decoding/control circuit 24
controls the switch circuit 26 via the control line 31, and supplies power to the receiving section 22 including up to the discriminator and the waveform shaping circuit 23 including the filter through an automatic operation generally referred to as a battery saving operation. This battery saving operation is based on the above-mentioned patent application No. 55-390.
As described in Section 38, it is used as a receiving method to measure the effective use of the power supply, and as shown in the time chart of Fig. 11, each group subscriber is controlled to apply power to the receiver.

In Figure 11, the power supply is turned on with the stroke shown in (b).
° When the prefix signal A is detected while the power is "on", the battery saving operation is temporarily canceled and the synchronization signal following the prefix signal A is turned on. Power is supplied for the period necessary to detect B.

Here, assuming that the owner of the receiver belongs to group G2, when the synchronization signal B is detected during the period of temporary release of the battery saving operation, the timer is started and the switch circuit 26 is controlled at the same time. Power to the receiving section 22 and waveform shaping circuit 23 is cut off. Then, when the timer reaches the position of its own group G2, it acts on the decoding/control circuit 24 and again supplies power to the receiving section 22 and wave bottom shaping circuit 23 via the switch circuit 26, thereby generating the group signal shown in FIG. Let's move on to detection. During the "PG" period in FIG. 3, the power supply is turned on and bit synchronization is established, and the detection of the information word sequence begins. Now, at this time, the decoding/control circuit 24 is waiting with a code corresponding to the address information written in the P-ROM 25, and performs error detection and correction in units of information words. And the MS of the input signal
If B is logic ``1'''', perform the same operation as before for the secondary information word, and if MSB is logic ``0'',
This code is compared with the address information of the P-ROM 25.

As a result, if a match is confirmed, the process moves to message information detection operation.

To detect message information, first, error detection and correction are performed on the input signal in units of information words. If the MSB of this signal is logic "0", the buffer 28
The alarm horn 29 is driven through the receiver to notify the receiver owner that the address information has been detected. Also, MSB
If is logic "1", the 20 bits of the information area are stored once in a register inside the decoding/control circuit 24, and error detection and correction are performed on the secondary information and words. If the MSB of the signal is logic "0", the contents stored in the register are decoded and the result is displayed on the display 30 (
(See Example 1 in the explanation of FIG. 4) and the buffer 28 drives the thisbe force 29.

If the MSB of the signal is logic "1#", it is assumed that the message information consists of 2 words, and the information area 2
The 0 bit is combined with the 20 information bits stored in the register to decode the function controller (17) and message information, and the result is displayed on the display 30 (see Example 2 in the explanation of FIG. 4). ), the path 26 is controlled via the buffer 28, and the transition is made to the battery saving operation again.

As is clear from the above description, according to the present invention, when transmitting multi-digit numerical information, the message signal is converted into BC, which is one of the cyclic codes using the same code as the address signal.
By constructing H(31, 21> and handling numerical information in pure binary code.

The multiple bits generated by handling with BCD codes can be used as a signal for other functions, which not only makes effective use of time and prevents a decrease in subscriber capacity, but also addresses The signal and message signal decoders are shared, reducing the hardware size.
Significant effects can be obtained on improving services and economic efficiency.

[Brief explanation of drawings]

(18) FIG. 1 is an example of the configuration of a signal applied to the present invention, FIG. 2 is an example of the configuration of one part of the signals in FIG. 1, and FIG. 3 is an example of the configuration of each group signal in FIG. FIG. 4 is a configuration example of the information area signal in FIG. 3. 5 shows an example of the code structure of the address signal in part 8 of FIG. 4, FIG. 6 shows an example of the code structure of the message signal corresponding to part D1 in FIG. 4, and FIG. 71 corresponds to part D2 in FIG. An example of the code structure of a message signal, FIG.
An example of the code structure of the function area in part F of the figure,
FIG. 9 is a diagram explaining the relationship between a series of numbers specified by the 5 part and the 2 part in FIG. 8, FIG. 10 is a block diagram showing the configuration of an embodiment according to the present invention, and FIG. 3 is a time chart showing the power supply operation of each group according to the battery saving method of the embodiment shown in the figure. In the figure, 20 is a power switch, 21 is an antenna, 2
2 is a receiving section, 23 is a waveform shaping circuit, 24 is a decoding/control circuit, 25 is a P-ROM, 26 is a switch circuit, 2
7 is a power battery, 28 is a buffer. 29 is a speaker, and 30 is a display.

Claims (1)

[Claims] 1. Radio receiving means for receiving a carrier wave modulated by a calling signal consisting of an individually selected calling number and message information, and demodulating the signal; An individual selective paging receiver comprising means for shaping the waveform of an output signal to determine its sign, and means for receiving the detected output of the sign determining means and notifying it as well as displaying the content of the signal. The individual selective calling number and the message information constituting the calling signal are each formed using the same code group, and a first code is added to the message information.
and a second information block for controlling information in the first information block, and the code discriminating means has means for detecting the calling signal, and a code discriminating means for detecting the calling signal; An individual selective call receiver comprising means for receiving message information having the information area from the detected output and decoding the signal. 2. In the individual selective calling receiver according to claim 1, the message information having the information area is formed into a plurality of code groups of the same format, and the decoding means is configured to form the message information having the information area into a plurality of code groups of the same format. 1. An individual selective calling receiver, characterized in that it can be shared by a receiver.