JP2538961B2 - Selective call communication method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a selective calling method for designating a receiver and transmitting transmission information, and more particularly, to an intermittent receiver for enhancing a battery saving effect. It relates to the receiving operation.

[Conventional technology]

FIG. 2 is a diagram for explaining an example of the signal structure and the operation of the receiver in the conventional selective call communication system, in which 8 is a signal frame structure and G1 to G15 represent groups for battery saving. , 9 is an example of the receiving operation of the receiver,
10 shows the signal structure in the group, S is a sync signal indicating the beginning of the group, A1 to A4 are four ringing signals, and B1
B4 represents information signals corresponding to A1 to A4, respectively.

Further, 11 is an enlarged view of the receiving operation of the receiver not designated by the calling signal, 12 is an enlarged view of the receiving operation of the receiver designated by the calling signal, and 13 is a structure of the calling signal. Here, N is a receiver number, P is a check bit for error correction, 14 is a structure of an information signal, M is an information content, and P is a check bit.

The conventional signal structure shown in FIG. 2 is divided into 15 groups as shown in FIG. 8, and the call signal of each receiver is transmitted only in the time slot of the group to which the receiver belongs.

Further, in the configuration of the group, the number of information signals for one call signal is fixed as shown in 10, so that the timing of transmitting the call signal is predetermined.

Therefore, the receiver is
Receive only the time slots of the group to which it belongs,
Also, as shown in 11, the battery saving effect can be achieved by receiving only the timing when the sync signal and the ringing signal are transmitted even within the group, and receiving the information signal as shown in 12 only when the ringing signal for itself is detected. I'm giving.

On the other hand, a signal configuration in which the number of information signal blocks is variable has been devised.

FIG. 3 is a diagram for explaining an example of a signal configuration in which the number of information signal blocks is variable and the operation of the receiver, in which 15 indicates a signal frame configuration, and G1 to G15 are for battery saving. Represents a group. Further, 16 shows an example of the receiving operation of the receiver, 17 is a diagram showing the signal structure in the group, S is a synchronization signal indicating the beginning of the group, A1 to A4 are four calling signals, and B1 to B4 are respectively A1 ~ A4
Represents the information signal corresponding to.

18 shows an enlarged view of the receiving operation. Also,
Reference numeral 19 shows the structure of the calling signal, C is an identification code for distinguishing the calling signal from the information signal, N is a receiver number, P is a check bit for error correction, and 20 is the information signal. In the configuration, C is an identification code for distinguishing a calling signal from an information signal, M is information content, and P is a check bit.

The feature of this signal structure is that the identification code is provided, and the receiver can distinguish whether the received signal is the calling signal or the information signal by the identification code. A break between the ringing signal and the information signal that follows can be detected.

Therefore, as shown in 17, the number of information signals designated by the calling signal can be changed as necessary.

[Problems to be solved by the invention]

In the former signal configuration described with reference to FIG. 2 among the conventional signal configurations as described above, since the number of information signals is fixed, long information cannot be transmitted. Further, when transmitting short information, an information signal is transmitted more than necessary, which is disadvantageous in that it is wasteful.

On the other hand, in the latter signal configuration described based on FIG. 3, it is not predetermined where in the group the call signal is transmitted. Therefore, as shown in 16 and 18, the receiver belongs to the group to which it belongs. Has to be transmitted for all the parts including the information signal to other receivers, and the effect of battery saving is inferior to the method described in FIG. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to realize a selective call communication system having both a large battery saving effect and flexibility of information to be transmitted.

[Means for solving problems]

According to the invention, the above mentioned objects are achieved by the means recited in the claims.

That is, the present invention relates to a signal generator for transmitting a call signal for designating a receiver and the like, and an information signal indicating the information content to be transmitted to the receiver designated by the call signal, and a signal generator for transmitting the signal. In a wireless communication system configured by a transmitting device that transmits each of the signals that are performed as a wireless signal, and a receiver that receives the wireless signal transmitted from the transmitting device,
The call signal is composed of at least a receiver number indicating the destination of the information content and an information amount notification signal indicating how many blocks of the information content the information content addressed to the receiver designated by the receiver number is composed of. The receiver is a selective call communication system in which reception is suspended for the time when an information signal addressed to another receiver is transmitted.

〔Example〕

FIG. 1 is a diagram for explaining an embodiment of the present invention, where 1 shows a frame structure of a signal, and G1 to G15.
Represents a group for battery saving. Further, 2 is an example of the receiving operation of the receiver, 3 is a diagram showing a signal structure in the group, S is a synchronization signal indicating the start of the group, A1 to A4 are four calling signals, and B1 to B4 are respectively The information signals corresponding to A1 to A4 are shown.

4 is an enlarged view of the receiving operation of the receiver not designated by the calling signal, and 5 is an enlarged view of the receiving operation designated by the calling signal. 6 is a diagram showing the structure of a ringing signal, C is an identification code for distinguishing the ringing signal from the information signal, N is the receiver number, and D is a block of the information signal to be received by the receiver designated by the ringing signal. An information amount notification signal indicating the number, and P indicates a check bit for error correction.

Further, 7 is a structure of an information signal, C is an identification code for distinguishing a calling signal from an information signal, M is information content, and P is a check bit.

In the signal structure of the present invention, the calling signal is composed of at least the receiver number and the information amount notification signal indicating the number of blocks of the information signal transmitted to the receiver designated by the receiver number.

The notification of the number of blocks of the information signal is transmitted by the information amount notification signal up to which block counting from the calling signal including the information amount notification signal, the information signal to the receiver designated by the calling signal continues. Can be done by.

The identification code is effective for preventing erroneous reception and malfunction when the information signal is erroneously recognized as a calling signal, but may be omitted without any problem. Further, the arrangement of the identification code, receiver number, and information amount notification signal in the calling signal does not depend on the method of 6.

With such a signal structure, the receiver detects the sync signal transmitted first in the group to which the receiver belongs, and subsequently receives the ringing signal. If the receiver's own receiver number is not detected in the calling signal, the number of blocks of the information signal for the receiver designated by the calling signal is determined from the content of the information amount notification signal transmitted in the calling signal. It is possible to detect and pause the reception while the block number is transmitted to reduce the current consumption.

On the other hand, the receiver detecting its own receiver number in the calling signal detects the number of blocks of the information signal addressed to itself by the information amount notification signal in the calling signal, and after receiving the number of blocks, the subsequent Return to the operation of receiving the calling signal of.

FIG. 4 is a diagram showing an example of the configuration of a receiver that performs such an operation, in which 21 is an antenna, 22 is a high frequency circuit, and 23
Is a decoder circuit, 24 is a signal processing circuit, 25 is an intermittent reception control circuit, 26 is a switch, and 27 is a battery.

In the figure, the signal transmitted from the transmitter is input to the signal processing circuit 24 through the antenna 21, the high frequency circuit 22, and the decoder circuit 23. In the signal processing circuit 24, the timing at which the group to be received is transmitted is detected by the synchronization signal, the presence or absence of information transmission to itself is detected by the receiver number in the calling signal, and by the receiver number by the information amount notification signal. The number of blocks of the information signal to the designated receiver is detected, and when the information is transmitted to itself, the reception of the information signal and the like are performed during the number of blocks.

The intermittent reception control circuit 25, while the signals of other groups are being transmitted based on the data from the signal processing circuit 24, and when there is no information transmission to itself, during the time indicated by the information amount notification signal. Controls the switch 26 to supply current to the high frequency circuit 22 and the decoder circuit 23.

Since the receiver operates in this manner, the signal generator can transmit information signals of the required number of blocks according to the information content.

Therefore, unlike the conventional method described in FIG. 2, the method of the present invention can transmit a long information content,
There is little waste even for short information content.

Further, the receiving operation of the receiver is as shown in 2, 4, and 5 of FIG. 1, and in the system of the present invention, if there is no information transmission to itself in the example shown in FIG. The ratio of the time for performing the reception operation is 5/17, and the battery saving effect is improved by about 3.4 times as compared with the conventional method described in FIG.

If information is transmitted to each receiver only a few times a day, receivers other than oneself will call most of the day, so the improvement rate of the battery saving effect is 1 call. The larger the number of information signals per unit, that is, the longer the information content to be transmitted, the larger.

〔The invention's effect〕

As described above, the method of the present invention has an advantage that various information contents can be efficiently handled without deteriorating the battery saving effect.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention, FIG. 2 is a diagram for explaining an example of a signal configuration in a conventional selective call communication system and an operation of a receiver, and FIG. 3 is another signal in a conventional system. FIG. 4 is a diagram illustrating an example of the configuration and the operation of the receiver, and FIG. 4 is a diagram illustrating an example of the configuration of the receiver. 1,8,15 …… Signal frame configuration, 2,9,16 …… Receiver operation example, 3,10,17 …… Group signal configuration, 4,11 …… Not specified by ringing signal Enlarged view of the receiving operation of the receiver, 5,12 …… Enlarged view of the receiving operation of the receiver specified by the ringing signal, 18 …… Enlarged view of the receiving operation, 6,13,19…
… Composition of call signal, 7,14,20 …… Composition of information signal, 21…
… Antenna, 22 …… High frequency circuit, 23 …… Decoder circuit,
24 …… Signal processing circuit, 25 …… Intermittent reception control circuit, 6 ……
Switch, 27 ... Battery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Oka 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (56) References JP-A-58-124338 (JP, A) JP-A-SHO 60-79838 (JP, A) JP-A-60-22845 (JP, A) JP-A-63-199526 (JP, A) JP-A-63-227136 (JP, A)

Claims (1)

(57) [Claims] 1. A signal generator for transmitting a call signal including information for designating a receiver and an information signal indicating information content to be transmitted to the receiver designated by the call signal, and the signal generator. In a wireless communication system configured by a transmitter that transmits each signal transmitted from the device as a radio signal, and a receiver that receives the radio signal transmitted from the transmitter,
The call signal is composed of at least a receiver number indicating the destination of the information content and an information amount notification signal indicating how many blocks of the information content the information content addressed to the receiver designated by the receiver number is composed of. , The selective call communication system characterized in that the receiver suspends reception for the time when the information signal addressed to another receiver is transmitted.