JPH06237204A - Radio calling system and receiving equipment - Google Patents

Abstract

PURPOSE:To improve the number of alllowable sets per one frequency by changing and transmitting a waiting frequency of a receiving equipment. CONSTITUTION:A numeral and a voice message transmitted to a receiving equipment 8 are stored temporarily in a storage part 4 of a base station 1. The station 1 can grasp the occupied time of all channels. Control information for changing a waiting frequency to a comparatively free channel is transmitted to the receiving equipment 8 used frequently, from the station 1, and by a frequency selecting means of the equipment 8, the waiting frequency is shifted. In such a way, by changing the waiting frequency set to the equipment 8, the occupied time of plural channels is averaged, the use efficiency of a transmission circuit is improved, and in the base station 1, a transmission waiting time decreases, and the number of allowable sets per one frequency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio pager called a pager, and more particularly to transmitting a voice message from a caller to a callee while complying with the standard of the current system. The present invention relates to a message transmission method of the wireless calling system.

[0002]

2. Description of the Related Art In a conventional radio calling system, a single standby frequency is assigned to each receiving device, and when an identification number unique to the receiving device is received from an information string transmitted at that frequency, a ringing tone or By receiving blinking light or generating vibration, etc.
It is common to let the (callee) know that there is a call. At present, not only simple calls but also standard messages containing numbers, symbols, and Chinese characters are transmitted and displayed on a receiving device. Also, in Japanese Patent Laid-Open No. 3-60227, a base station transmits an audio signal
A system is disclosed in which, after D / D conversion and storage as a digital signal, the signal is stored in a message storage unit provided in a receiving device via a wireless line and D / A converted and reproduced. Further, Japanese Patent Application Laid-Open No. 61-228734 discloses a system in which only the transmission of voice information in the transmission information is switched in frequency and transmitted in another channel.

Another example of transmitting information using a plurality of frequencies (channels) is a specific low power radio operation system. The communication procedure of this method is described in Specified Low Power Radio Station STD-17 published by Radio System Development Center. In this method, one control channel and a plurality of communication channels are determined for each application. In the communication procedure, the calling side first checks a plurality of communication channels and searches for an unused channel (carrier sense). When a free channel is found, the control channel calls the other party. At this time, free channel information is also transmitted to the other party. The called side moves to the channel designated by the other party and waits. After that, the calling side also moves to the designated channel and starts communication.
After the communication is completed, the system automatically moves to the control channel and waits for the next call again.

As shown in these examples, in communication in which the ratio of the amount of control information to the amount of data information is large, a plurality of channels are separated into those for control and those for communication, and the purpose of use of the channels is clarified. There is.

[0005]

In the current radio paging system operating using a plurality of frequencies (channels), all channels are set as communication channels. When registering a new receiving device in the wireless calling system, it is difficult to predict the calling time or frequency for the receiving device carrier in advance. Has been assigned the standby frequency. For this reason, the usage is biased to a specific channel due to the caller's convenience, and the usage of each channel varies. Furthermore, the use may concentrate on some channels, and the number of base station transmission wait states may increase.

Further, the transmission time of one information amount currently transmitted from the base station varies depending on the transmission speed, but it is, for example, about several seconds because it is only the calling number and a simple message. However, when a voice message is added to the conventional information, the amount of information increases by the added time. Generally, the minimum amount of information of a voice message is several seconds, and it is about 10 to 30 seconds on average. Therefore 1
The time for occupying a channel for transmitting information is significantly increased compared to the present time. As a result, the number of transmission waiting states in the base station increases, and the allowable number of receiving devices assigned to one frequency decreases.

Further, in the communication system in which the control channel and the communication channel are separately operated, the number of all the receiving devices is operated by one control channel, so that the use degree of the control channel is significantly increased. However, the transmission waiting state of only the control channel will increase, and the total allowable number will decrease from the current level. Further, in the receiving device, since the control channel and the communication channel are switched for each data communication, the built-in battery is quickly consumed by the circuit current caused by the operation of the frequency selection circuit each time. .

As another method for changing the standby frequency of the receiving device, a plurality of standby frequencies may be stored in advance in the storage unit of the receiving device, and the desired standby frequency may be selected by the carrying operation of the carrier. However, the standby frequency to be used may not be selected due to an operation error or no operation.

A first object of the present invention is to reduce the transmission waiting state of a base station which is caused by an increase in the amount of information and a concentration of use on a specific channel in the existing system.
It is to improve the allowable number of units per frequency.

Another object of the present invention is to make it possible to change the standby frequency of the receiving device by the control information transmitted from the base station, so that re-registration to the system and optimization of the receiving device can be performed without bothering the carrier. It is to try to realize.

[0011]

In order to achieve the above object, the device of the present invention comprises a frequency selecting means for selecting a transmission frequency for a base station for transmitting information, and a standby frequency set for each receiving device. A storage unit for storing the identification number is provided, the receiving device is provided with a frequency selecting unit for selecting a standby frequency, and a storage unit for storing information on the selected standby frequency. Change the standby frequency.

In order to achieve the above-mentioned other object, the device of the present invention uses the control information transmitted from the base station to the receiving device.
The standby frequency of the receiving device is stored in the storage device of the receiving device, and the standby frequency is set according to the control information stored in the storage device of the receiving device when the receiving device is activated.

[0013]

[Function] Numbers and voice messages transmitted to the receiver are
Once stored in the storage means of the base station. The base station also manages the standby frequency and the identification number assigned to each receiving device. Therefore, the base station can grasp the occupied time of all channels. Therefore, the base station transmits control information for changing the standby frequency to a relatively vacant channel to the commonly used receiving device, and the standby frequency is shifted by the frequency selecting means built in the receiving device. In this way, by changing the standby frequency set in the receiving device from the beginning, the occupied time of a plurality of channels is averaged and the use efficiency of the transmission line is improved. In addition, since the use efficiency of the transmission line is improved, the transmission waiting time is reduced in the base station.

The standby frequency information stored in the storage means of the receiving device can be used as data for initial setting of the receiving device. Therefore, by storing the standby frequency information of the receiving device in the storage means by the control information transmitted from the base station, re-registration to the system is simplified, and the receiving device is automatically operated at the target standby frequency. be able to.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of a radio paging transmission / reception system of the present invention. As shown in FIG. 1A, the system includes an input unit 3 that processes information from the telephone line 2, a storage unit 4 that stores information, an output unit 5 that wirelessly transmits information, an antenna 6, and an entire unit. As shown in FIG. 2B, the base station 1 including the control unit 7 for controlling the
It is composed of a portable receiving device 8 for receiving a call.

FIG. 2 is a block diagram of the essential parts of one embodiment of the base station. Although the figure shows a case where it is used for a private line for explanation, the present invention is not limited to this and may be a public line.

The caller can transmit a numeric message, a voice message, or the like from any extension telephone 22 to the receiving device 8 of the carrier (callee). Base station 21
Are connected to a private branch exchange (PBX) 23 via a telephone line, although not particularly limited thereto. The line IF 24 is responsible for interface connection with a telephone line, the A / D conversion unit 25 digitizes an analog voice signal, and the voice storage memory unit 26 is for temporarily storing a data message. Further, the D / A conversion unit 27 is for returning the data accumulated in the analog mode to an analog signal, and the modulation unit 28 converts the data to FSK (Freqency Shift).
t Keying) modulation, the transmission unit 29 performs power amplification for transmitting radio waves, and the antenna 30 is for efficiently emitting radio waves into the air. Further, the transmission frequency selection unit 31 selects and sets the transmission frequency of the transmission unit. In the voice response memory unit 32, words and the like for instructing the caller to operate by voice are stored as digital information. In addition, the receiving device information memory unit 33,
The clock unit 34 stores information such as the standby frequency and the identification number assigned to the receiving device, and the clock unit 34 manages the time of the message. And the whole control part 35
It is controlled by.

On the other hand, FIG. 3 shows a block diagram of a main part of an embodiment of the receiving apparatus. The antenna 42 efficiently receives radio waves from the air, the high frequency amplifier 43 amplifies the radio signal fed from the antenna, the demodulator 44 demodulates (detects) the FSK-modulated signal, and the voice storage memory unit. 45 stores received data only when the device identification numbers match, and D
The A / A converter 46 removes unnecessary frequency components (low pass filter) to convert the digital signal into an analog signal, and the output amplifier 47 power-amplifies the analog signal to sound the speaker or earphone 48. Is. Further, the reception frequency selection unit 49 includes a reception device information storage unit 52.
The standby frequency of the receiving device is set according to the information stored in. Further, the operation display unit 51 is composed of a display for displaying the number of received messages, file number of memory, message arrival, outside of service area, etc., and switches for instructing operations such as reproduction, repeat, protection and deletion. Reference numeral 50 is for detecting a synchronization signal, determining whether it is a call addressed to itself (own station), generating a reception end signal (message incoming signal) to a carrier, correcting an error in received data, and inputting to the operation display unit 51. It controls the entire receiving device 41 such as output operation.

Next, basic operations of the base station and the receiver will be described. 4 and 5 show operation flows of the base station.

FIG. 4 shows a message input operation. When the caller is connected to the line with the base station, the caller inputs a message such as voice or numeral (step 61). When a message is input, the base station performs an input process of storing the message in the storage unit. This process is continued until the input of the message is completed (steps 62, 63, 64). End of input detection is specific DTM in case of numeric message
In the case of an F (Dual Tone Multi Frequency) code, a voice message, a time-out judgment for counting the silent time (step 65), or detection of a line disconnection signal is performed. When the input process is completed, the line is disconnected and the transmission process is performed (step 66).

FIG. 5 shows a message sending operation. Base station is the frequency (channel) to which the receiver is assigned
Check the transmission buffer (step 70). When there is a large amount of information in the transmission buffer and a long time is to be waited for, and in the case of transmission to a receiving device that is frequently used, processing is performed to change the standby frequency of this receiving device to a relatively vacant channel. Further, the past change record of the receiving device is checked (step 71). If it has been changed, and within a certain period after the change (for example, one month), only the control information for changing the frequency is transmitted even with the standby frequency before the change (step 72). This is a countermeasure when the power of the receiving device is not turned on or when the frequency change information is not received outside the service area. In the frequency changing process, first, control information for changing the frequency is transmitted on the currently used channel (steps 73 and 74). Then, the record of frequency information of the receiving device is updated and stored (step 75). Then, the designated transmission frequency is set (step 76).
After a lapse of a certain time, control information such as a synchronization code and identification information is first transmitted to the receiving device according to the transmission procedure (step 77), and subsequently message information such as numbers and voices is transmitted (step 78). After transmitting both messages, the end code is finally transmitted to end the series of sequences (step 79).

On the other hand, FIG. 6 and FIG. 7 show operation flows of the receiving device.

FIG. 6 shows an initial setting flow of the receiving device.
Normally, when the power is turned on, any receiving device first reads the standby frequency setting data from the reception information storage unit 52, and then sets the standby frequency in the reception frequency selecting unit 49 (steps 101, 102, 103). After that, it waits for a message.

FIG. 7 is a message reception flow. The receiving device detects the presence or absence of the synchronization signal, and if the synchronization signal is successfully detected (step 111), the receiving device receives the device identification number sent subsequently to the synchronization signal, and receives its own device identification number. It is compared with the identification number (step 112). As a result, the receiving devices that do not match return to the beginning again and wait for the next synchronization signal, but only the receiving devices that match will move to the next step and receive the control information (step 113). If there is frequency change information in the control information, the frequency shifts to the designated frequency, the frequency information is stored in the receiving device information storage unit 52, and the reception of the message is awaited again (steps 114, 115, 116). If there is no frequency change information, a mode for receiving a message is entered (step 114). Here, the data detected by the demodulation unit 44 is sequentially stored in the voice storage memory unit 45 (step 117). This operation is performed by the voice storage memory 4
5 is full and overflows, an end code is received, or until the number of data predetermined by the agreement is received (steps 117, 118, 11).
9). After that, in order to notify the called party that a message addressed to itself (incoming station) has arrived, a ringing tone or blinking of light, vibration, or the like is generated, and the reception processing ends (step 120).

FIG. 8 shows an example of the information format transmitted from the base station. In the content of the information format, the synchronization code 141 and the identification number 142 are pager call signals, and if the call signal is for the own station, the information that follows is valid. Although the content of the control information 143 is not particularly limited, time information 147 used as a time stamp,
Channel information 148 for specifying the standby frequency, and an instruction 14 for controlling whether or not to store the standby frequency in the storage unit
There is 9 mag. Following the control information 143, there are a numerical message 144, a voice message 145, etc., and an end code 1
At 46, one piece of information ends.

FIG. 9 is a front view and a side view of a receiver (voice pager) showing an embodiment of the present invention. The receiving device 201 includes a display unit 202, a mode selection switch 203,
Message selection switch 204, execution switch 205,
Power switch 206, stop switch 208, volume switch 209, speaker 207, earphone terminal 210
It is composed of.

[0027]

According to the present invention, by changing the standby frequency of the receiving device for transmission, the use efficiency of a plurality of transmission lines is averaged, and the allowable number of devices per frequency is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a system showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a main configuration of an embodiment of a base station according to the present invention.

FIG. 3 is a block diagram showing a main configuration of an embodiment of a receiving apparatus according to the present invention.

4 is a flowchart showing a message input operation of the base station of FIG.

5 is a flowchart showing a transmission operation of the base station shown in FIG.

6 is a flowchart showing an initial setting operation of the receiving device in FIG.

7 is a flowchart showing a message receiving operation of the receiving device in FIG.

8 is a format explanatory diagram of information transmitted from the base station 1 to the receiving device 8. FIG.

9 is a front view (a) and a side view (b) of the receiving device of FIG.

[Explanation of symbols]

1 ... Base station, 2 ... Telephone line, 3 ... Input section, 4 ... Storage section,
5 ... Output part, 6 ... Antenna, 7 ... Control part, 8 ... Receiving device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yosuke Mori 1-280, Higashi-Kengikubo, Kokubunji-shi, Tokyo Inside Central Research Laboratory, Hitachi, Ltd.

Claims (3)

[Claims] 1. A base station, an interface circuit for a telephone line, an input means for inputting information from the interface circuit for the telephone line, a first storage means for storing the input information, and a receiving device for receiving. From the second storage means for storing the frequency and the identification number, and a plurality of transmission frequencies,
It has an output means for selecting and transmitting a specific transmission frequency,
The receiving device is provided with frequency selecting means for selecting a specific receiving frequency from the plurality of receiving frequencies, storage means for storing the selected receiving frequency, and output means for outputting the received information. A radio paging system characterized by selecting and changing the reception frequency of the receiving device according to control information transmitted from a base station to the receiving device and transmitting the information. 2. The receiving device according to claim 1, wherein information on the receiving frequency of the receiving device is stored in the storage means of the receiving device by control information transmitted from the base station to the receiving device. 3. The receiving device according to claim 1, wherein when the receiving device is activated, the receiving frequency is set according to information of the receiving frequency stored in the storage means of the receiving device.