JPH06252829A - Radio call system - Google Patents

Abstract

PURPOSE:To reduce occurrence of a wrong call and undesired power consumption of a receiver. CONSTITUTION:A base station 10 sends repetitively a termination signal comprising an error correction code using termination information representing an end of call in succession to a call signal till a call signal area is occupied when a signal length of the call signal is less than a specified length in a group signal. A receiver 20 detects the end of the call signal based on the termination signal sent repetitively and recognizes the absence of the succeeding call signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a radio calling system for mobile communication. In particular, it is used for a radio paging system when there are few paging signals to be transmitted.

[0002]

2. Description of the Related Art FIG. 5 shows a frame format of a paging signal of a radio paging system. FIG. 6 shows the frame format of one group signal when the signal length of the call signal of the conventional radio call system is less than the specified length.

Conventionally, in a radio paging system, a signal transmitted from a base station has a signal length r as shown in FIG.
It consists of n group signals of (bit) connected (consisting of n group). Also, each group signal is
As shown in FIG. 5 (2), it consists of a sync signal having a signal length s (bits) and a paging signal area of a prescribed length t (= rs) into which a paging signal to a receiver belonging to this group is inserted. Here, when the signal length p (bits) of the calling signal is equal to the specified length t of the calling signal, the calling signal area is filled with k calling signals as shown in FIG. Each call signal is composed of k address signals which are subscriber identification signals and a message signal following the address signals. Further, the address signal and the message signal are
As shown in FIG. 5 (4), the address information and the message information are used as information, and an error correction code having a signal length u (bits) in which a check bit is added to this information is used. Here, the specified length t is an integral multiple of the signal length u of the error correction code.

Here, when the call volume of the call signal is small, such as at night, the signal length p of the call signal may be less than the specified length t of the call signal. FIG. 6 shows a conventional configuration of one group signal in this case. As shown in FIG. 6, following the calling signal, a termination signal and a dummy signal indicating the end of the calling signal are transmitted in one group signal. Here, the signal length of the termination signal is equal to the signal length u of the error correction code. The signal length of the dummy signal is (tp), and the signal length of the dummy signal is an integral multiple of the signal length u of the error correction code.

On the other hand, the receiver side receives this signal,
Further, when the termination signal is correctly decoded and the termination information is identified, it is recognized that the calling signal does not exist thereafter and the dummy signal is ignored.

[0006]

When the error correction code cannot be decoded when received in a bad environment such as a low reception level, or when an error correction occurs and the decoding can be performed correctly. Even in the case, the decoding result may include an error. Therefore, in such a conventional radio paging system, as shown in FIG. 6, a signal having a small call volume and having a signal length p of the paging signal less than the specified length t of the paging signal in the group has termination information. There is a problem that the receiver may not be identified, and an erroneous call may occur at the receiver.

In addition, when the termination signal is identified, since there is no ringing signal after that, the power of a part of the receiver is turned "off".
It is possible to However, there is a problem that unnecessary power is consumed because the termination signal cannot be identified as described above.

The present invention solves the above-mentioned drawbacks, and when receiving a call signal with a small call volume, it is possible to prevent an erroneous call from occurring in the receiver and reduce unnecessary power consumption. The purpose is to provide.

[0009]

A first invention comprises a base station connected to a general telephone network and a receiver for receiving a call signal transmitted from the base station, wherein the call signal is a plurality of signals. In a radio paging system composed of a group signal, the plurality of group signals is composed of a synchronization signal area of a predetermined length and a paging signal area of a prescribed length, the base station is one of the plurality of groups. When the signal length of the ringing signal of the signal is less than the specified length, a means for repeatedly transmitting the termination signal subsequent to the ringing signal until the ringing signal area of the one group signal is filled is included.

Further, according to the present invention, the termination signal may be composed of an error correction code having termination information indicating termination of a calling signal in the one group signal as information.

Further, according to the present invention, the termination signal is composed of termination information indicating the end of the paging signal in the one group signal, and an error correction code having the signal length of the paging signal of the one group signal as information. Can be done.

According to the present invention, the termination signal includes termination information indicating termination of a paging signal in the one group signal, and information indicating a period length of the paging signal of the one group signal that is less than the specified length. Error correction code.

A second invention is a receiver used in the above system. The receiver comprises means for recognizing that there is no ringing signal thereafter based on the termination signal. This receiver can be traded as an individual product separately from the above method.

[0014]

In the base station, when the signal length of the ringing signal is less than the specified length among the group signals, the base station is composed of an error correction code having the termination information indicating the end of the ringing signal as information. The signal is repeatedly transmitted until the ringing signal area is satisfied, and the receiver detects the end of the ringing signal based on the repeatedly transmitted termination signal, recognizes that there is no ringing signal thereafter, and ignores it. As a result, when a ringing signal with a small call volume is received, the number of times the end signal is detected increases, so detection is reliable, and false reception is prevented at the receiver, and unnecessary reception is performed by performing intermittent reception. Power consumption can be reduced.

[0015]

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

FIG. 1 is a block diagram of a radio paging system according to an embodiment of the present invention. FIG. 2 shows a frame format of one group signal when the signal length of the paging signal of the radio paging system is less than the specified length.

In FIGS. 1, 2 and 5, the radio paging system is a base station 10 connected to a general telephone network 30 and a receiver 20 for receiving a paging signal transmitted from the base station 10.
The ringing signal is composed of a plurality of group signals 1 to n, and the plurality of group signals 1 to n is composed of a sync signal area having a predetermined length s and a ringing signal area having a specified length t.

The feature of the present invention is that the base station 10 follows the calling signal when the signal length p of the calling signal of one of the plurality of group signals is less than the specified length t. It is to include means for repeatedly transmitting the termination signal until the calling signal area of this one group signal is satisfied.

The termination signal is composed of an error correction code having termination information indicating the termination of the paging signal in the one group signal as information, and the receiver 20 has a paging signal thereafter based on this termination signal. Including means to recognize not to do.

The operation of the radio paging system having such a configuration will be described.

In FIG. 2, the synchronization signal and the signal length p
After transmitting a paging signal having (p ≦ prescribed length t of paging signal), a termination signal having a signal length u of an error correction code having termination information indicating the termination of the paging signal in this group as information is continuously transmitted. To do. The continuous transmission number j of the termination signal is multiplied by the continuous transmission number j of the termination signal and the signal length u of the error correction code, and the value added to the signal length p of the calling signal is the signal length t of the calling signal. Will be decided. That is, j = (t−P) / u holds.

On the receiver side, the signal shown in FIG. 2 is received,
Further, when the error correction decoding is performed correctly, if it is identified that the decoded signal is the termination information, it becomes possible to recognize that the calling signal does not exist thereafter. Therefore, subsequent signals can be ignored, and it is possible to "turn off" some of the receiver power.

FIG. 3 shows a frame format of one group signal of the radio paging system according to another embodiment of the present invention. Figure 4
In the above, after transmitting a ringing signal having a synchronization signal and a signal length p (p ≦ specified length t of ringing signal), termination information indicating the end of the ringing signal in this group signal and the signal length p of the ringing signal [or ringing A terminal signal having a signal length u of an error correction code whose information is a period (tp) where the signal length p of the signal is less than the prescribed length t of the calling signal is continuously transmitted. The continuous signal number j of the termination signal is multiplied by the continuous transmission number j of the continuous termination signal and the signal length u of the error correction code, and the signal length added to the paging signal p becomes the specified length t of the paging signal. Is decided. That is, j = (tp) / u is established.

FIG. 4 is a flow chart showing the operation of the receiver when a call signal of the radio call system according to another embodiment of the present invention is received. In FIG. 4, when one error correction code is received and further correctly error-corrected and decoded, if it is recognized that this decoded signal is not termination information, normal call signal reception processing is performed, but termination information is used. When it is recognized that there is a signal, the signal length of the paging signal received with the termination information (or the signal length of the paging signal is the specified length t of the paging signal).
With a period length of less than, it becomes possible to recognize the end position of the calling signal in this received frame, that is, the position of the first termination signal.

Due to the low reception quality due to the low reception level and the like, the error correction code recognized as the termination information may not be the end position of the paging signal in this reception frame. It becomes possible to recognize the position. Therefore, it is possible to turn off the power supply of a part of the receiver by ignoring the recognized first termination signal and thereafter. On the other hand, when one error correction code cannot be received, or when the received error correction code cannot be received correctly, the reception of the error correction code is awaited.

The receiver in the embodiments can be individually traded as a commodity in the market as the object of this embodiment, and the user can use it by connecting to the base station of the radio calling system.

[0027]

As described above, according to the present invention, the number of times of detecting the termination information indicating the termination of the ringing signal in one group signal is increased, and the position of the first termination signal can be recognized. There is an excellent effect that the generation of calls and unnecessary power consumption of the receiver can be suppressed.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a radio paging system according to an embodiment of the present invention.

FIG. 2 is a frame format of one group signal when the signal length of the paging signal of the radio paging system of the present invention is less than the specified length.

FIG. 3 is a frame format of one group signal when the signal length of the paging signal of the radio paging system according to another embodiment of the present invention is less than the specified length.

FIG. 4 is a flowchart showing the operation of the receiver when the signal length of the call signal of the radio call system according to another embodiment of the present invention is less than the specified length.

FIG. 5 is a frame format of a paging signal of a radio paging system.

FIG. 6 is a frame format of one group signal when the signal length of the call signal of the radio call system of the conventional example is less than the specified length.

[Explanation of symbols]

 10 base station 20 receiver 30 general telephone network 40 subscriber telephone

Claims (5)

[Claims] 1. A base station connected to a general telephone network, and a receiver for receiving a calling signal transmitted from the base station, wherein the calling signal includes a plurality of group signals, and the plurality of groups. The signal is a radio paging system composed of a synchronization signal area of a predetermined length and a paging signal area of a prescribed length, wherein the base station has a signal length of the paging signal of one of the plurality of group signals as the regulation. A radio paging system characterized by including means for repeatedly transmitting a termination signal after the paging signal until the paging signal area of the one group signal is satisfied when the length is less than a predetermined length. 2. The radio paging system according to claim 1, wherein the termination signal is composed of an error correction code having termination information indicating the termination of the paging signal in the one group signal as information. 3. The termination signal is composed of termination information indicating termination of a paging signal in the one group signal, and an error correction code having a signal length of the paging signal of the one group signal as information. The radio calling method described in 1. 4. The termination signal is information on termination information indicating the end of the paging signal in the one group signal, and an error correction code having information about a period length of the paging signal of the one group signal which is less than the specified length. The radio paging system according to claim 1, which comprises 5. The receiver used in the system according to any one of claims 2 to 4, further comprising means for recognizing that there is no ringing signal thereafter based on the termination signal. Radio calling method.