JPH0244821A - Selection radio calling system - Google Patents

Abstract

PURPOSE:To prevent malfunction when different calls are transmitted to the same address in continuous frames by inserting information on the number of calling times into a selection call signal when the selection call signal is transmitted plural times for one call. CONSTITUTION:The frame of the selection call signal is transmitted plural times for one call, information 26 that the frame is how many numbered one in the call is inserted into address information 20 for respective frames of the selection call signal. With transmitting information 26 on the number of the calling times from a transmission side, the discrimination of the frame which a receiver has received can be securely recognized. Thus, malfunction when a reception state is deteriorated can be prevented and the call signal can continuously be transmitted for the same address.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to the configuration of a selective call signal in a selective call system, and particularly to the reception rate when a selective call signal is transmitted multiple times for one call. This relates to a signal configuration for improving the performance.

[Conventional technology]

As one of the conventional radio paging methods, there is a method of transmitting a selective paging signal multiple times for one paging in order to improve the reception rate.

In this way, by sending the selective call signal multiple times for one call, for example, 70 calls can be made in one call.
%, the probability that you can receive a call if you call 3 times is 97.3 because you only need to be able to receive a call 1 out of 3 times.
%, which is significantly improved.

Therefore, calling multiple times for one call has a great effect on improving the reception rate.

When calling a receiver multiple times, the transmitting side sends the selective calling signal a specified number of consecutive frames in the same time slot, and the receiving side counts the number of times it is sent to recognize the number of calls. .

In order to count the number of calls, it is necessary to recognize that the information is being sent to the own receiver. For this purpose, an address signal is used to distinguish calls from calls to other receivers. Then, when the address signal is first received, it starts counting, and thereafter processes the specified number of calls as the same call.

An example of the operation of such a receiver is shown in FIG. 4 as a flow chart.

This flowchart shows a case where the receiver performs a battery saving operation.

[Problem to be solved by the invention]

In the conventional selective radio paging system as described above, if reception conditions are poor, the receiver displays incorrect information when there is another call to the receiver with the same address. This may occur.

FIG. 5 is a diagram illustrating an example in which such a reception error occurs.

As shown in (a) of the same figure, if the address signal cannot be received in the first call (nth frame), even though this call should have ended at the 12th frame shown in (C), First, the receiving side judges that the calls are the same up to the n+3 frame (another call to the same address) shown in (d), and as a result, the n+1 frame in (b),
The transmitted information received by calling frame n+2 in (c) and frame n+3 in (d) will be displayed.

On the other hand, the receiver has a function of combining the transmission information received during each call, and can recognize that the call has been received if it is received even once out of three times. This is a necessary function in order to improve the reception rate as mentioned earlier.

However, due to this function, in the previous example, even though transmission information 1, transmission information 2, ..., transmission information m was originally transmitted, the receiver does not transmit the transmission information shown in (e). Thus, transmission information 1, transmission information 2, . . . , transmission information m will be displayed, resulting in an incorrect reception operation.

Conventionally, in order to prevent such malfunctions, a method has been adopted to prevent receiver malfunctions by prohibiting calls to the same address from being placed in consecutive frames and leaving a gap of at least two frames.

In view of these conventional problems, the present invention has been developed to prevent errors in transmitted information even when the reception condition is unstable when a selective paging signal is sent multiple times for one paging system in a radio paging system. It is an object of the present invention to provide a radio paging system that can prevent display and perform continuous transmission.

[Means to solve the problem]

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

That is, the present invention provides a selective radio paging system in which one frame consists of address information and a plurality of pieces of transmission information following this, and the same information is transmitted multiple times using a plurality of frames in one call to a called receiver. This is a selective radio paging method in which information regarding the number of calls to the seven frames is inserted into the address information of each frame used for one call to the same receiver.

[For production]

In a selective radio paging system, the present invention transmits a frame of a selective paging signal multiple times during one paging, and the address information for each frame of the selective paging signal includes the number of times the frame is included in the paging. The most important feature is to include information regarding whether the frame is

In the conventional technology, the number of calls is confirmed by counting a predetermined number of times after first receiving an address signal on the receiving side, and depends only on the operation of the receiving side. On the other hand, in the present invention, since the transmitting side sends information related to the number of calls, this allows the receiver to clearly distinguish between received frames, thereby preventing the above-mentioned malfunction when the receiving condition deteriorates. It is possible to prevent this, and it is possible to send paging signals continuously to the same address.

〔Example〕

FIG. 1 is a block diagram of an embodiment of the present invention,
(a) shows the configuration of the transmitting side, and (b) shows the configuration of the receiving side.

In FIG. 5A, a call receiving section 1 on the sending side accepts a call from a general telephone network and converts it into information 7 format for use within the device.

The information conversion unit 2 creates an address signal and a transmission information signal based on the internal information converted by the call reception unit 1.

The number of calls setting unit 3 sets an initial value of the number of calls based on the information on the number of calls included in the internal information. Encoding unit 4
converts the address signal and the transmission information signal into an error correction code for the wireless section.

The number of calls decrement unit 5 is a circuit that decrements the number of calls every time it is called in the case of a plurality of calls, and does not perform decrement when the number of calls is 0. The transmitting unit 6 transmits information on actual radio waves.

The receiving section 7 on the receiving side shown in FIG. 2(b) plays the role of extracting information components from actual radio waves. The synchronization detection unit 8 detects a synchronization signal so that the receiver is synchronized with the time slot to be received. The decoding unit 9 decodes the original information from the error correction code in the wireless section. Address storage section 1
0 is a part that stores the address information of the own receiver. The address matching section 11 matches the received address information with the address information stored in the address storage section 10, and if they match, issues an operation command to the sound/display section 12. The sound/display unit 12 performs a sound operation and a display operation of transmitted information in response to a command from the address verification unit 11.

The call count detection unit 13 recognizes the number of calls based on the sent call count information, and if the call count is 0, it recognizes that the call from the next frame is a different call and performs a receiving operation. Address verification unit 11 to enter
It has the function of controlling.

In this embodiment, with such a device configuration, information on the number of calls is included in the selective call signal, thereby allowing the receiving side to recognize the end of the call.

Therefore, multiple different calls to the same address can be sent in consecutive frames. Even if different information from the same address is sent in this way, the receiving side will not display incorrect transmitted information.

FIG. 2 is a diagram showing an example of the signal configuration of the present invention, and shows one signal frame, in which 20 is an address information section;
211-2in is transmission information, 22 is address information, 23
24 is address information, 25 is check information, and 26 is call count information indicating how many times the frame is related to the call.

In the embodiment shown in FIG. 1, the call count information 26 is set in the call count setting section 3 on the sending side, while on the receiving side, the call count detection section 13 detects this and sets the address. By controlling the collation unit 1J, malfunctions are suppressed.

FIG. 3 is a flow chart showing an example of the operation of the receiver of the embodiment.

This flowchart shows a case where the receiver performs a battery saving operation, and also shows a case where a predetermined remaining number of calls is sent as the number of calls information.

〔Effect of the invention〕

As explained above, according to the present invention, in the selective radio paging system, when the selective paging signal is sent out several times for one call, information on the number of paging is inserted into the selective paging signal. Therefore, there is an advantage that even if different calls with the same address are sent in consecutive frames, no malfunction will occur on the receiving side.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of a signal configuration of the present invention, FIG. 3 is a flowchart showing an example of the operation of the receiver of the embodiment, and FIG. 5 is a flowchart showing an example of the operation of a conventional receiver, and FIG. 5 is a diagram illustrating an example in which a conventional reception error occurs. 1...Call reception department, 2...
・Information conversion unit, 3... Call count setting unit, 4... Encoding unit, 5...
... Call count decrement part, 6 ...
...Transmitter, 7 ...Receiver, 8
....Synchronization detection section, 9 ....Decoding section, 10 ....Address storage section,
11... Address verification section, 12...
Sound/display section, 13...Call count detection section, 20...Address information section,
211~2in...Transmission information, 2
2, 24...address information,
2325 ...Information for checking, 2
6...Call count information

Claims (1)

[Claims] A selective radio call in which one frame consists of address information and a plurality of pieces of transmission information following this, and the same information is sent a plurality of times using a plurality of frames in one call to a called receiver. A selective radio paging method, characterized in that, in the address information of each frame used for one call to the same receiver, information about the number of times the frame is called is inserted and transmitted.