KR100310410B1 - Wireless pager - Google Patents

Abstract

According to the present invention, power is supplied to the high frequency circuit unit 20 in a frame period corresponding to a preamble packet and a sync code and a corresponding address among a plurality of frames from a data format decoded from a radio call signal. In the radio pager having a function of saving power by cutting off the power supply to the high frequency circuit unit 20 at a frame time that does not correspond to, the power is forcibly supplied to the high frequency circuit unit 20 in a period in which power supply is cut off. And a modulator 40 for modulating data input to the microprocessor 30 through the key input unit 24, and the oscillation signal of the local oscillator 16 when receiving a signal. When inputting to the converter 13 and transmitting a signal, a transmission in which the modulated data of the modulator 40 is mixed with the oscillation signal of the local oscillator 16. A wireless pager capable of transmitting and receiving a switching unit 44 for switching a call to a transmitting antenna 48, the wireless pager according to the present invention further provides a function for transmitting and receiving a specific signal to the setting Accordingly, it can play a role of searching for the counterpart under a specific condition, and it can perform the function of receiving the radio call signal by the built-in configuration of the wireless pager without a separate device for wireless transmission and reception, and at the same time, it can transmit and receive data. There is this.

Description

Wireless pager that can send and receive

The present invention relates to a wireless pager capable of transmitting and receiving, and more particularly, to a wireless pager combined with a function of transmitting data and receiving the transmitted data.

The pager is a device for receiving a signal transmitted from the base station to inform the user that the call signal has been received, and consists only of a function of receiving a radio signal from the base station.

1 schematically shows a configuration of a radio pager according to the prior art, wherein a signal transmitted from a radio call base station is received by a reception antenna 10 and input to a high frequency circuit unit 20.

The high frequency circuit unit 20 includes a low noise amplifier 11, a bandpass filter 12, a frequency converter 13, an IF amplifier 14, a demodulator 15, and a local oscillator 16, and the power supply in the pager. Since it is a large part of consumption, it refers to a circuit part that supplies or cuts power as needed in order to save power, which is named by the present inventors for convenience.

The radio call signal received by the reception antenna 10 is first amplified to low noise by the low noise amplifier 11. This signal extracts only signals in the radio frequency band by a band pass filter 12, and removes other signals. In particular, signals of other communication means such as mobile phones are removed by the bandpass filter because of different frequency bands, and thus are not disturbed by the signals used in such communication means.

The signal passing through the filter 12 is converted into the intermediate frequency IF by the frequency converter 13 as a signal corresponding to the radio calling band. Since the received radio call signal is in a high frequency state, it may be oscillated if it is amplified too much. Therefore, the signal is converted to an intermediate frequency and then amplified by the IF amplifier 14 to strengthen the weak signal. At this time, the oscillation signal generated by the local oscillator 16 is mixed with the received signal and converted into a signal of a desired intermediate frequency IF by the difference frequency for frequency conversion.

When the pager receives a radio call signal having one type of frequency, it is possible that the local oscillator 16 provides one oscillation frequency, so that the local oscillator 16 generates oscillation frequencies having different frequencies. no need. Therefore, the local oscillator 16 may use oscillating one fixed frequency.

However, in the case of wide area wireless calling, since different base stations use different frequencies, a frequency synthesizer capable of changing the frequency of the oscillation signal according to the corresponding frequency is used as the local oscillator 16 in order to receive these different frequency signals. . In this way, the received signal mixed with the oscillation frequency of the local oscillator 16 and changed to the intermediate frequency is filtered by the intermediate frequency filter to select only the intermediate frequency band and then amplified by the IF amplifier 14.

The demodulator 15 separates the digital signal from the amplified signal by, for example, a frequency shift modulation (FSK) method, and the decoder 22 analyzes the digital signal to store the data transmitted to its address in the received data. Check if there is any, and perform the synchronization process according to the transmission format to extract the transmitted message.

The microprocessor 30 displays the received message on the display unit 34, stores necessary data in the memory unit 32, and calls it to the user by sound (beep or melody) or vibration when an alarm needs to be generated. You will be informed that a signal has been received. The user can input various selections or make necessary settings to the microprocessor 40 using the key input unit 24.

Such a pager has only a function of receiving a radio call signal from a base station, but in recent years, as the need for bidirectional data communication increases, a bidirectional transceiver capable of transmitting and receiving data is required. However, the conventional two-way transceiver has to use a high-power radio wave, there is a disadvantage that the device is complicated and expensive.

In particular, as a short-range transceiver having been commercially available and widely used in recent years, a device for generating an alarm by exchanging data at a very short distance and exchanging various functions, for example, data of a desired counterpart, in accordance with the exchange of data has been put to practical use.

The present invention has been made in view of the disadvantages of the prior art, and its object is to provide a radio pager capable of transmitting and receiving repeating transmission and reception alternately.

It is still another object of the present invention to provide a radio pager capable of transmitting and receiving in parallel.

1 is a block diagram showing the configuration of a pager according to the prior art,

2 is a diagram illustrating elements constituting a packet of a radio call signal;

3 is a block diagram showing the configuration of a pager that alternately performs transmission and reception in accordance with the present invention;

4 is a block diagram showing a configuration of a pager for simultaneously performing transmission and reception according to the present invention;

5 is a flowchart illustrating a process of finding a desired partner while performing a function of a pager according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

10: receiving antenna 20: high frequency circuit portion

24: key input section 26: power supply section

30: microprocessor 40: modulator

44: switching unit 48: transmitting antenna

The object of the present invention is a receiving antenna for receiving a radio call signal, a high frequency circuit unit for amplifying, filtering, frequency converting, intermediate frequency amplifying and demodulating the received signal to extract digital data, and decoding the digital data. A decoder that detects the data transmitted to the address from the data including the extracted preamble packet, the sync code and the plurality of frames, extracts the transmitted data, a microprocessor for processing the received message, and under the control of the microprocessor A memory unit for storing the received message, a display unit for displaying the received message, an alarm unit for notifying that the radio call signal has been received, and a key input unit for inputting desired data to a microprocessor; A pager, said decoding Power is supplied to the high frequency circuit unit in a frame period corresponding to the preamble packet, the sync code, and the corresponding address among the plurality of frames, and the high frequency circuit unit is supplied at the frame time not corresponding to the address. A wireless pager having a function of saving power by cutting off a power supply, wherein the power saving function is activated to forcibly supply power to a high frequency circuit in a period in which the power supply is interrupted, and a microprocessor via a key input unit. A modulator for modulating the input data and inputting the oscillation signal of the local oscillator to the frequency converter when receiving a signal, and mixing the modulated data of the modulator with the oscillation signal of the local oscillator when transmitting a signal; Switching to transmit the transmission signal to the transmission antenna It may be achieved by transmitting and receiving wireless pager including a switching.

As defined above, in the conventional pager, the high frequency circuit part includes the low noise amplifier 11, the bandpass filter 12, the frequency converter 13, the IF amplifier 14, the demodulator 15 and the local oscillator 16 of FIG. Including a means that the consumption of the power to perform the receiving function is large means that the power supply is made or cut off. On the other hand, in the radio pager according to the present invention employing the function of transmitting and receiving data, the high frequency circuit unit, as well as the above-described configuration of the prior art, the modulation unit 40, the switching unit 44 and the transmission amplifier 46 shown in FIG. ) And a first local oscillator 50 and a second local oscillator 52 shown in FIG. 4. In the meaning of battery saving, the BS is hereinafter abbreviated as "BS".

Since the pager uses a battery as a power source, the BS function of the high frequency circuit section 20 is employed. 2 shows a data format of the color coding (POCSAG) method decoded by the decoder. The data format of the paging signal consists of a preamble packet for synchronizing the paging signal with the paging machine, a sync code indicating the start of the frame, and a frame from 0 to 7. For convenience, the state in which power is supplied to the high frequency circuit unit 20 is "BS on", and the power saving function is executed, and the state in which power is not supplied is displayed as "BS off". 2 shows the state of the BS on or off when the frame number of the pager is 3, the BS is in the ON state in the preamble packet, the sync code, and the frame 3, and the frames 0 to 2 and the frames 4 to 7 BS is off.

Since a unique address and frame number are assigned to each pager, the frame is initialized by receiving a preamble of the radio call signal and then receiving synchronization and sync codes. Referring to FIG. 3, the pager supplies power to the high frequency circuit unit 20 so as to receive a radio call signal only in its own frame, and turns off the power at another frame time.

The pager of the present invention detects the on / off of the BS and releases the BS when the radio call function is temporarily suspended, thereby forcibly supplying power to the high frequency circuit unit 20 while simultaneously supplying necessary data during this time. Configured to transmit.

3 is a block diagram showing the configuration of a pager that alternately performs reception and transmission according to the present invention. As shown in this figure, the wireless pager of the present invention adopts the configuration of the conventional wireless pager as it is, performs the operation as a wireless pager as it is, and at the same time, a power saving function is executed to cut off the power supply to the high frequency circuit unit 20. It is configured to forcibly cancel the power saving function to supply power and transmit data input by the user. This forced power supply may allow the decoder 22 or the microprocessor 30 to detect and automatically perform an operation state of the power saving function, or may be separately performed by the user through key input.

In order to transmit data, the user inputs desired data through the key input unit 24, which is processed by the microprocessor 40 and modulated by the modulator 40. The modulated signal is transmitted through a transmission antenna 48 on a carrier frequency generated by the local oscillator 16. At this time, the transmission amplifier 46 may be selectively employed to amplify the transmission signal so that the signal can be transmitted to a long distance. When the transmission amplifier 46 is not used, it can be received only in a short distance, for example, in a range of 5 to 10 m in radius.

On the other hand, the frequency generated by the local oscillator 16 is provided to the frequency converter 13 when receiving data, and transmits the transmission signal to the transmission amplifier 46 when transmitting. The switching unit 44 transmits the oscillation signal to another path by dividing the transmission time and the reception time according to the control signal of the microprocessor 30.

According to the present invention, a radio pager capable of transmitting and receiving data transmits data using a time when a radio call signal is not received according to the above-described transmission structure. At this time, it is preferable that the frequency of the transmission signal uses a frequency adjacent to the frequency band of the radio call signal. If a signal exceeding this range is transmitted, even if the pager of the present invention receives the signal, it is removed by the bandpass filter 12 and cannot be received.

Since the frequency provided by the local oscillator 16 and the frequency to be provided to the outgoing data are different when receiving the radio call signal and converting the frequency, the frequency value can be provided by the microprocessor 40 each time transmission and reception. Alternatively, if the oscillation frequency of the local oscillator is fixed, but the value is fixed so as to oscillate a frequency corresponding to the difference between the frequency of the radio call signal and the intermediate frequency provided to the IF amplifier 14, the oscillation is performed separately for each transmission. Even if the microprocessor 40 does not provide a frequency value, the oscillator may be configured to be switched only by transmission and reception even when the oscillator provides a fixed frequency signal.

The signal transmitted in the pager of the present invention may be received by the pager of the present invention set to receive the same frequency. In the case of receiving a signal transmitted from the pager, the received signal extracts digital data via the high frequency circuit unit 20. The extracted digital data is not suitable to be decoded by the decoder which decodes the preamble packet and the sync code of the paging signal and the paging signal having the structure of eight frames. Therefore, the extracted digital data is directly input to the microprocessor 40 and the microprocessor ( 40) to process the data. To configure the signal from the pager in the same format as the signal from the base station, it is configured to transmit in a simple format that can be received at a short distance because the transmission structure in the pager is complex and consumes a lot of power. In the received pager, it is preferable to convert the signal into a digital signal and directly process the microprocessor 30.

The microprocessor 40 stores the data in the memory unit 32, displays the data on the display unit 24, or generates an alarm (sound or vibration) by the alarm unit 36 according to the result of the analyzed data. do.

In the foregoing description, the wireless pager according to the present invention alternately performs transmission and reception. However, since the reception function is stopped during the transmission time, reception efficiency may be reduced. Therefore, transmission and reception of data can be performed more smoothly by continuously performing transmission and reception simultaneously. 4 shows a configuration of a pager configured to simultaneously perform transmission and reception in accordance with the present invention.

The pager of the present invention receives the pager signal and analyzes the packet to detect whether there is a pager signal transmitted to the pager in the frame of the pager and continue to function as a receiver of the pager for processing the message. On the other hand, when the frame is not the corresponding force is supplied to the high frequency receiving unit and the oscillator circuit to send a signal and to perform the function of receiving the transmitted signal at the same time.

The radio call signal transmitted from the radio call base station and the transmission signal transmitted from the radio pager are received by the reception antenna 10 and processed by the high frequency circuit unit 20 to separate the digital signal. When the digital signal obtained from the demodulator 15 is the data received from the base station, the packet is analyzed by the decoder 22 to extract a message of a radio call, and is input to the microprocessor 30 to perform a necessary operation as a radio pager. Done. On the other hand, since the signal transmitted from the pager does not have a frame structure, the signal is converted into a digital signal by the demodulator 15 and immediately input to and processed by the microprocessor 30.

As described above, the transmission function is performed by the transmission circuit while continuing the reception function through the reception antenna 10 and the high frequency circuit unit 20. The user inputs desired data to the microprocessor 30 through the key input unit 24, and the input data is modulated by the modulator 40 and then the oscillation frequency oscillated in the second local oscillator 52 as a carrier. And transmit via the transmission antenna 48.

The first local oscillator 50 configured in the receiving circuit section is used for frequency conversion of the received signal, and the second local oscillator 52 is used for frequency oscillation necessary for data transmission. The frequency of the first local oscillator 50 used for reception and the second local oscillator 52 used for transmission should use different frequencies from each other, and two local oscillators are configured for such frequency separation.

As described above, the apparatus of the present invention that transmits / receives in parallel has a higher reception efficiency than a device that alternately performs transmission and reception, thus eliminating the possibility that the reception may be missed at a time at which the reception is stopped. have.

The wireless pager of the present invention is configured to transmit and receive in this way, alternately repeating or simultaneously. Since the signal transmitted from the pager is weak, it can only be received in the near field, and thus can be used for near field data communication. Using this characteristic, it is possible to give a function to find a desired counterpart.

Since the pager according to the present invention provides a bidirectional communication function, communication is performed by at least two or more pagers. As described above, when setting a search for a desired partner, when the first user transmits data of a desired condition using the first pager, the second pager of the second user who receives the data receives the data. The analysis generates an alarm when the second user satisfies the input condition to inform the first user that the second user in the desired condition is near. On the other hand, when data of a condition desired by the second user is received, an alarm occurs in the second pager. As such, when the first and second users receive a message having a suitable condition from each other at a short distance and an alarm occurs, the users can confirm that they are looking for each other.

For example, when a user inputs data for finding a party to go to a theater, the signal is transmitted in a radius of several meters or tens of meters around the pager. Similarly, when a person seeking a party to go to the theater is within this effective range, the transmission signal is received to generate an alarm. Such applications can be configured to generate an alarm in both pagers if the desired conditions match with each other when inputting and transmitting data to find a heterosexual friend.

According to the present invention, in the radio call signal format, power is supplied to the high frequency circuit unit for the preamble packet, the sync code, and the frame of the radio pager (BS on), and for the frames other than the frame, the power supply is cut off ( BS off) In a method for transmitting and receiving data by a pager, it is determined whether the BS is on or off, and performs the function of receiving a radio call signal in the BS on state, and in the BS off state by canceling the BS off forcibly Provided is a method for supplying power to the high-frequency circuit unit to modulate the data input by the user to wirelessly transmit and receive a wireless signal.

5 is a flowchart illustrating a process of alternately performing transmission and reception while maintaining a radio calling function for data exchange together with a radio calling function. In the format of the paging signal, the preamble packet, the sync code, and the frame in which the pager receives the message are supplied with power to the high frequency circuit unit (BS on), and the power is cut off from the high frequency circuit unit at frame times other than the corresponding frame ( In a pager having a BS off function, a method of transmitting and receiving data when the BS is off will be described.

When the program starts, the radio pager receiving the radio call signal from the radio base station detects and synchronizes the preamble packet and the sync code (S100).

It is determined whether the BS is off (S102). When the power supply to the BS off, that is, the high frequency circuit unit 20 is cut off, since the radio call function is temporarily stopped, the power supply for reception is resumed according to the present invention and the reception frequency is set (S104).

It is detected whether there is a reception signal received from the pager (S106). If there is a reception signal, the microprocessor processes the data (S108).

If the microprocessor analyzes the data and determines that the range set by the receiver and the range set by the sender is the matched party, the receiving user is informed by the alarm and / or display that the receiving user has received the signal of the desired party. (S112). After the alarm is generated, it is detected whether the BS is off again (S114). If the power supply to the high frequency circuit unit is cut off, the radio call frame is checked to determine whether there is a radio call signal, and if there is a received message, the radio call unit performs an original function as a wireless pager for generating a display and an alarm (S126).

In step S110, if it is not a partner to find the analysis result of the received data, it is determined whether the BS is off (S116). If the BS is on (power supply), it corresponds to a preamble packet, a sync code, or a wireless pager of a radio call signal format. Since it is time to receive the frame to perform the function of the pager to detect the address signal of the pager and display a message (S126). If the BS is off in step S116, the feedback signal is fed back to step S106 to detect the received signal.

If it is not possible to receive the signal transmitted from the pager in step S106 by setting the transmission frequency by the microprocessor (S120) and transmits its information according to the user's setting (S122). Upon completion of transmission, it detects whether the BS is off (S124), and if the BS is on (power supply), performs the function of the pager (S126). Goes.

This process is repeated again from the beginning after the end of the process to perform the steps of transmitting and receiving the necessary data and the function as a pager. If desired by the user, the wireless call function may be completely stopped and only the function of searching for a desired partner may be performed by transmitting and receiving necessary data.

Since the pager of the present invention forcibly releases the BS and transmits and receives data, power consumption may increase, thereby shortening the life of the battery. Therefore, by providing a selection key, it is possible to additionally provide a selection key to operate as a radio pager and to transmit and receive data only at a time desired by the user.

As is apparent from the above description, the pager according to the present invention may further provide a function of transmitting and receiving a specific signal, and may serve to find a counterpart under a specific condition according to a setting. Therefore, there is an advantage that the function of receiving the radio call signal as it is by the configuration built into the pager without a separate device for wireless transmission and reception and data transmission and reception at the same time.

Claims (4)

A reception antenna 10 for receiving the radio call signal, a high frequency circuit unit 20 for amplifying, filtering, frequency converting, intermediate frequency amplifying and demodulating the received signal, and extracting digital data; and a preamble extracted by decoding the digital data. A decoder 22 for detecting data transmitted to a corresponding address from data including a packet, a sync code, and a plurality of frames, extracting the transmitted data, a microprocessor 30 for processing the received message, and the micro Under the control of the processor, a memory unit 32 for storing the received message, a display unit 34 for displaying the received message, an alarm unit 36 for notifying that the radio call signal has been received, and data desired by the user A wireless pager comprising a key input section 24 for inputting a microprocessor 30 to the microprocessor 30, wherein the decoded In the frame period corresponding to the preamble packet and the sync code and the corresponding address among the plurality of frames from the data format, power is supplied to the high frequency circuit unit 20 (Battery Saving (BS) on) and applied to the corresponding address. In the radio pager having a function to save power by cutting off the power supply (BS off) to the high frequency circuit unit 20 at a frame time that does not correspond, A power supply unit 26 forcibly supplying power to the high frequency circuit unit 20 when the power supply is cut off; A modulator 40 for modulating data input to the microprocessor 30 through the key input unit 24; The oscillation signal of the local oscillator 16 is input to the frequency converter 13 when BS is on, and the modulated data of the modulator 40 is mixed with the oscillation signal of the local oscillator 16 when BS is off. Transmittable radio pager including a switching unit 44 for switching the transmission signal to transmit to the transmission antenna (48). 2. The pager as claimed in claim 1, further comprising a transmission amplifier (46) for amplifying the transmission signal. In the radio calling signal format, the preamble packet, the sync code, and the frame of the pager are supplied with power to the high frequency circuit unit (BS on), and the frame is cut off (BS off) from the frame other than the frame. In the method for transmitting and receiving data by Determining whether the BS is on or off, Performing a function of receiving a radio call signal in a BS on state; And releasing the BS off and forcibly supplying power to the high frequency circuit to modulate the data input by the user to wirelessly transmit and receive the radio signal. 4. The method of claim 3, wherein the BS is forcibly released by the user's selection to supply power to the high frequency circuit to modulate the data input by the user, and to wirelessly transmit the data.