JPH0748895B2 - Selective call receiver - Google Patents

Description

The present invention relates to a receiver used in a selective calling system.

[Conventional technology]

The selective call signal is divided into groups, and each group is composed of one synchronization word and a plurality of selective call signals,
A transmitter for transmitting a transmission signal in which a synchronization word is composed of a frame synchronization signal and a group code specific to each group,
In the wireless selective call communication method, which is configured by a receiver that selectively receives only the group to which its own calling number belongs except for the time slot in which the group to which its own calling number belongs is transmitted, Each receiver is assigned only one of its own group, and receives only in a certain time slot in which the signal of its own group is transmitted.

[Problems to be solved by the invention]

In the conventional selective calling method as described above, when different services are provided for each group, there is an inconvenience that the user must prepare as many receivers as there are services to be used.

On the other hand, in the method in which the same service is divided into a plurality of groups, when there is traffic deviation, a call overflows for a certain group, and waiting and call loss occur on the transmitting side. Another group may have vacancy within the timeslot. Therefore, the use efficiency of the carrier channel must be set low.
As a method, there is a drawback that the number of receivers that can be accommodated is reduced.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a selective call receiver capable of receiving a plurality of time slots with a single receiver.

[Means for solving problems]

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

That is, in the conventional selective call receiver, each receiver stores only one group code indicating the time slot to be received by itself, and fixedly receives only the designated time slot. On the other hand, in the present invention,
The receiver arbitrarily designates a plurality of time slots to be received fixedly or based on a control signal included in the transmitted synchronization signal.

〔Example〕

FIG. 1 is a diagram showing a configuration of a receiver according to a first embodiment of the present invention, in which 1 is a radio receiving unit, 2 is a decoding unit, 3 is a battery saving circuit, 4 is a memory, and 5 is a signal decoding device. The notification unit for notifying the user of the result is shown.

When setting synchronization immediately after turning on the power of the receiver, first, a plurality of group codes are received and decoded. The battery saving circuit 3 compares the group code of the plurality of time slots to be received stored in the memory 4 with the decoded group code to set the synchronization for battery saving.

One of the reasons for this is that the transmission order of group signals is not always constant, and for example, in area A, G1 → G2 → G3 →
.., because it may differ in the B region as G1 → G5 → G2 → …….

If the calling order of the group numbers is determined, only one group code needs to be compared. Another reason for comparing a plurality of group codes is that it is possible to specify an arbitrary group by comparing a plurality of codes.

With such an operation, the receiver can fixedly receive the time slot corresponding to the group code stored in the memory in advance.

FIG. 2 is a diagram showing an example of the operation of the present receiver, in which (a)
Shows a selective call signal, (b) shows the operation of a receiver that receives a time slot corresponding to a conventional single group code, and (c) shows a time slot corresponding to a plurality of group codes. It shows the operation of the receiver for receiving.

FIG. 3 is a diagram showing an example of the operation of the second embodiment of the present invention.

In FIG. 3, (a) shows a selective call signal,
(B) shows the operation when the control signal is received and the subsequent time slots also continue to receive. Fig. 3 (a)
In the selective call signal shown in FIG. 6, a sync signal is designated by 6, and in the present embodiment, the control signal included in the sync signal indicates that the subsequent time slot should be received.

That is, each receiver stores a single group code to receive a time slot corresponding to a single group. When it is judged that the selective call signal belonging to the group cannot be processed within its own time slot due to a rapid increase in traffic and the traffic of the group to which the time slot following immediately after is allocated has a margin,
On the transmitting device side, in the synchronization signal transmitted at the beginning of the time slot of the group with a lot of traffic, or in place of a part of the selective call signal, the receiver belonging to the group also has the following time slots. A control signal is sent to continue the reception. Normally, the receiver suspends reception after the end of its own time slot, but when it receives the control signal, it does not suspend reception and also performs reception for subsequent time slots.

〔The invention's effect〕

As described above, according to the present invention, it is possible to receive a plurality of time slots with one selective receiver.

That is, according to the method of the first embodiment, it is possible to receive a plurality of services with one receiver, and it is possible to improve the convenience of the user and reduce the cost when the radio call services are diversified. There is an advantage that can be.

On the other hand, according to the method of the second embodiment, the carrier channel can be efficiently used even if there is traffic deviation, and the utilization rate of the line capacity can be improved.
There is the advantage that the number of receivers that can be accommodated per carrier channel can be increased.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a receiver of the first embodiment of the present invention, FIG. 2 is a diagram showing an example of operation of the first embodiment of the present invention, and FIG. 3 is a second diagram of the present invention. It is a figure which shows the example of operation | movement of the Example of this. 1 ... Wireless receiving unit, 2 ... Decoding unit, 3 ... Battery saving circuit, 4 ... Memory, 5 ... Notification unit, 6 ... Synchronizing signal

Claims (2)

[Claims] 1. A time slot is divided into a plurality of time slots, each time slot is composed of one synchronization signal and a plurality of selective calling signals, and the synchronization signal is a signal for setting synchronization of a receiver and is unique to each time slot. In the selective calling system composed of the group code, the signal inserted in the group code part is used as a control signal, and the decoded group code is collated with the group codes of a plurality of time slots stored in the receiver and received. A selective call receiver comprising means for determining a plurality of time slots to be operated. 2. The selective call receiver according to claim 1, wherein when a control signal instructing to continue the reception is received, the subsequent time slot is continuously received after the reception of its own time slot is completed.