KR0181141B1 - Pager - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Wide Area Wireless Calling System.

2. The technical problem to be solved by the invention

In the wide area wireless calling system, the wide area wireless pager automatically determines its current location and provides the wide area wireless calling service to the channel of the corresponding area.

3. Summary of Solution to Invention

The first call information and the second call information for the local jurisdiction are output from the transmitter of the wide area wireless calling system, and the frame of the first call information is composed of dummy cap codes and regional data, and is sent out over the entire frame at a predetermined cycle. In the second call information, the local judging method of the wide area pager, in which the frame is composed of cap code and message data, is set in the process of setting the receiver to the reference channel frequency in the local judging mode and waiting for data reception. A process of checking whether or not a dummy cap code is received through a reference channel, a process of receiving and judging subsequent regional data when receiving a dummy cap code, and setting a receiver to a service channel corresponding to the determined region, and then transitioning to normal mode. The process is done.

4. Important uses of the invention

The wide area pager automatically determines the current zone and locates the channel of the zone.

Description

Local Decision Method for Wide Area Wireless Calling System and Pager

1 is a diagram showing the configuration of a wide area radio calling system.

2 is a diagram showing the configuration of a data link that wide area radio calling systems establish to perform wide area radio calling services.

3 is a diagram illustrating a behavior of encoding and transmitting area information according to the present invention in a wide area radio calling system according to the present invention.

4 is a diagram showing a configuration of a wide area pager for carrying out the present invention.

5 is a flowchart illustrating a process of determining an area in accordance with the present invention in a wide area pager.

The present invention relates to a wide area radio calling system, and more particularly, to a method of transmitting area information at a transmitter of a wide area radio calling system and determining the area by the wide area radio pager.

Mobile communication refers to a communication service that allows a subscriber to receive desired information regardless of location using a wireless medium called radio waves. The mobile communication system is divided into analog mobile communication and digital mobile communication according to the modulated signal format on the air interface. A digital mobile communication method is suitable for efficient use of a wireless channel and various data services. One such digital mobile communication service method is a wireless paging service.

Such a wide area wireless paging service distributes a number of sites that can simultaneously transmit information on the same radio frequency, thereby increasing the service area and serving data. As the service area becomes wider, the service area is limited due to the difficulty of simulcasting the wireless paging signal and the increase of equipment of the transmitter. Therefore, if the calling party leaves the corresponding service area, the wireless calling service cannot be received. In order to solve this problem, a wide area wireless paging service system is currently proposed.

The wide area radio calling service includes a method of using the same channel in each region according to an aspect of channel operation when configuring a system, and a method of using a different channel in each region. First, the same channel in each region, as in the former, may cause problems such as confusion because of the difficulty of simultaneous transmission, the increase in the equipment of the transmitter, and the same channel in the overlapping region. Secondly, as in the latter method, using a different channel for each region does not need to install an additional channel for each region and may use a currently operating channel, but requires a multi-channel receiving terminal. At this time, considering the efficiency of channel use in the system of the wireless calling system currently used, the method of using a multi-channel receiving terminal is most suitable. This is because the service channel in each region operates in the same way as the current wireless calling method, and when the pager moves through the region, the service channel receives service through the service channel in each region.

The domestic wireless paging service currently used divides the nation into nine regions (Gyeonggi, Gangwon, Chungnam, Chungbuk, Gyeongbuk, Gyeongnam, Jeonbuk, Jeonnam, and Jeju). In addition, the structure of the transmitter for outputting the radio call signal in each zone as described above is configured as shown in FIG. 1 to independently serve the corresponding zone. Therefore, in order to perform the wide area wireless calling service using the transmitters having the configuration as shown in FIG. 1, a subscriber database for 9 regions in the country in the form of FIG. A data link must be established. At this time, the database of each region stores all information such as subscriber's address and current location.

According to the method of serving the call data of the wide area wireless call subscriber, it can be classified into two methods as follows. First, whenever there is call data of a wide area subscriber, there is a method of transmitting call data to all service channels of the nation. Secondly, when the subscriber moves to the area, the current location is registered in the system, and since the system knows the current location of the subscriber, if there is calling data, the data link only sends the data to the area where the subscriber is located. to be. In the former method, since there is always a need to call nationwide whenever there is call data of a subscriber, an unnecessary data may need to be sent frequently. Therefore, when the traffic of data is high, that is, when there are many users, the wireless calling service becomes difficult. Therefore, as in the latter method, it is desirable for the subscriber to register the current location in the system to use the radio call channel efficiently.

When the latter service method is used, the service channel before the movement and the service channel after the movement may be different when the user wants to receive the service by moving the service area. Therefore, in order for the user to continue to receive the service, the receiver of the pager must be able to tune to the service channel of the region where the user is currently located.

In this case, the user may designate a region to which the wireless pager is to be serviced to manually tune the receiver's channel, or the wireless pager may determine the current position and automatically tune the receiver's channel to receive the wireless call service. . At this time, in order for the pager to automatically determine the current location and tune the receiver, the system should send the information of the area so that the pager can automatically recognize the current location.

As described above, a method for automatically determining a region where a current wireless pager is located by transmitting region information is disclosed in Korean Patent Applications No. 20795 and No. 20796, filed with the applicant. That is, the Republic of Korea Patent Application Nos. 20795 and 20796 have been described on the assumption that data transmitted from a wireless paging system is a POCSAG code. In general, a POCSAG code is composed of one preamble and subsequent arrangements. Each batch consists of one sync codeword followed by eight frames. Each frame consists of an address codeword and a message codeword. In addition, the address codeword is composed of 32 bits. The wireless pager checks the address codeword only within the frame allocated to the radio pager, and then detects the transmitted message codeword to find its own data.

On the other hand, when the wireless broadband pager according to the prior application is powered on or moves out of the region registered by the subscriber, the controller of the wireless broadband pager sequentially selects reference channel frequencies accessed from the EEPROM, and selects the selected reference channel frequency. Specify the channel by outputting periodically and check the reception of data from the designated channel. The data is a signal output from the decoder. That is, the decoder decodes the received code and data to detect and output a preamble signal, a word sink, and frame data allocated to the wireless wide area pager. When the data is received, the controller analyzes the region information included in the cap code to determine the region where the current wireless broadband pager is located, and then outputs the service channel frequency of the corresponding region to analyze the frame data received from the designated service channel. do.

As described above, the radio wide area pager according to the first application is driven only in a frame allocated to itself among a plurality of received frames to perform a reference channel search operation for analyzing a current position. In this case, the received frames may be in POCSAG code format.

On the other hand, if all the frames of the transmission signal format transmitted from the transmitter of the radio wide area calling system is provided with area data including area information, the plurality of radio wide area pagers of the corresponding area performs the reference channel search operation in its frame period. You will be able to quickly determine your location.

Accordingly, an object of the present invention is to provide a method in which a transmitter can quickly determine a local location by transmitting frame data including only dummy cap codes and local data at regular time intervals in a transmitter in a wide area wireless calling system.

Another object of the present invention is to provide a method for a wide area wireless pager to quickly determine a current location by receiving frame data consisting only of dummy capcodes and area data.

Another object of the present invention is a transmitter in a wide area wireless calling system transmits frame data composed of only the dummy cap code and area data every frame at a predetermined time period, and the wide area pager is configured to transmit the frame data consisting of the dummy cap code and area data. The present invention provides a method for quickly determining a current location by receiving.

In order to achieve the objects of the present invention, the transmission device is each frame consists of only the dummy cap code and local data, the first call information and the corresponding frame is transmitted over the entire frame of the batch at regular intervals to the cap code and message data In the wide area wireless paging system for transmitting the second call information, the area determination method of the wide area wireless pager includes the steps of: setting a receiver at a reference channel frequency and waiting for data reception in the local determination mode; Checking whether the dummy cap code is received through the receiver, receiving and determining the following regional data when the dummy cap code is received, and setting the receiving unit to a service channel corresponding to the determined region right after the normal Characterized in that the transition to the mode.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same parts in the figures represent the same reference signs wherever possible.

Among the terms used below, the first call information is information transmitted for local determination, and refers to call information in which a dummy cap code is located in an address area and local data is located in a message area in frame data. The second call information is general call information, in which the cap code is carried in the address area and the message information is carried in the message area. The term “regional judging mode” refers to a mode in which the current jurisdiction is determined so that a wireless call can be received in a corresponding region when the wide area pager is turned on or moved to another region. The term normal mode refers to a mode in which the wireless call function is normally serviced after performing the region determination mode.

The transmitter of the wide area radio calling system for carrying out the present invention has the same configuration as those in FIGS. 1 and 2, and constitutes the same data link as in FIG.

FIG. 3 shows the form of the first call information output from the transmitting apparatus having the configuration as shown in FIG. 1 in the region determination mode according to the present invention. The first call information includes a dummy cap code in an area of address data in one frame data area and local data in an area of message data. Herein, the dummy capcode acts as a second address until all of the wide area wireless pagers receive the regional data of the subsequent message area regardless of their addresses.

In order for the pager according to the present invention to automatically find a region, it is necessary to tune the RF receiver to all channels of each region to receive the region data. However, scanning all regions takes a lot of time. Therefore, by dividing the whole country into a plurality of zones so as not to overlap, and after setting the reference channels of the plurality of zones, the local location can be determined by receiving and analyzing local data while searching these reference channels. Table 1 below shows the relationship between the reference channel, the regional area, and the service channel taking the case of dividing the whole country into five regional areas.

Criteria for setting the dummy cap code and regional data are as follows. Currently, the capcode operation system of domestic pager is divided into each region. For example, subscribers in the Seoul and Gyeonggi area have 11XXXXX in the first two digits of the decimal cap code, and subscribers in the Busan and Gyeongnam area have 12XXXXX in the first two digits. Is done. That is, in the current pager, the cap code is composed of seven decimal digits, and the first two digits of the seven digits are used as information indicating the location of the global zone. Here, the five digits XXXXX after the first two digits are used as address information of subscribers subscribed to the region.

However, at this time, an unused cap code can be used as a dummy cap code. For example, a dummy cap code can be set to a cap code that uses an area code not currently used, such as 00XXXXX or 20XXXXX. In addition, since the message of the frame data can transmit numeric data of five characters, the local data can use numeric data of five characters. The reason for transmitting the area data together with the dummy cap code is to allow the wireless wide area pager to recognize the dummy cap code as an address assigned to it and to receive subsequent area data.

However, the dummy cap code of the reference channel should be the same for all regions, but the regional data should be different for all regions. This is because even if the wide area pager is located, the dummy cap code must be the same to receive the region data, and the region data of all the regions must be different to know exactly which region. For example, in the reference channel in the Seoul / Gyeonggi area, the dummy cap code and local data 11111 should be transmitted at regular time intervals, and in the reference channel in the Busan / Gyeongnam area, the dummy cap code and the local data 22222 should be transmitted. do.

On the other hand, a method for recognizing a region using a dummy cap code and region data may cause the following problems. That is, the pager generally has a frame corresponding to itself in the format of the transmission signal transmitted from the system. If the pager uses frame 3, the pager always turns on the RF receiver in frame 3 to receive data. However, when the dummy capcode is added due to the wide area function, if the dummy capcode frame and the original capcode frame are different, the pager must receive and analyze data at two frame positions in each batch. The consumption of current increases. For example, if the magnetic frame is the third frame and the frame with the dummy capcode is the seventh frame, the wide area pager must receive the data by turning on RF at frames 3 and 7 in each batch, and thus Increases consumption. To solve this problem, a dummy cap code must be set in every frame of the transmission signal transmitted from the system.

In the embodiment of the present invention, the first call information composed of only the dummy cap code and the region data is transmitted at predetermined time intervals, and the dummy cap code is loaded in each address area of all eight frames constituting one batch, and each message area is transmitted. We send regional data of area that we correspond to and send. In the present invention, as shown in FIG. 3, it is assumed that the first call information is transmitted in eight frames of the first arrangement immediately following the preamble signal. Therefore, a dummy cap code is sent to each address area of the 0-8 frames constituting the first arrangement, and regional data which is information of the corresponding area is sent to each message area. Therefore, each transmitting apparatus of the wide area wireless paging system having the configuration shown in FIG. 1 and FIG. 2 outputs preamble data as shown in FIG. Send local data.

The wide area pager for receiving the call information output from the transmitter as described above is configured as shown in FIG.

The RF receiver 10 includes an amplifier 11 for amplifying a received RF signal, a saw filter 12 for filtering an RF signal output from the amplifier 12, a designated channel frequency, and the filter 12. Mixer 13 for mixing the filtered RF signal output from the filter, an Intermediate Frequency Filter 14 for filtering the output of the mixer 13 at an intermediate frequency, and the filter 14 An amplifier 15 that amplifies the output, and a demodulation circuit 16 that demodulates the second output after the second mixing and filtering of the output of the amplifier 15. The RF receiver 10 has a channel designated by the frequency synthesizer 50, and converts and outputs an RF signal of a designated channel received through an antenna into digital data. The RF receiver 10 amplifies the weak RF signal received through the designated channel, frequency-converts the amplified signal to the original signal band and demodulates the waveform, and outputs the demodulated signal as digital data. Data coded when transmitting the digital data.

The decoder 20 has power supply control means and decoding means. The decoder 20 generates a power control signal for supplying power to the RF receiver 10 by the power control means in the local judging mode, and the decoding means compares the received call information with a dummy cap code to obtain local data. Converts the binary data into binary data, and in the normal mode, the power control means generates a power control signal for supplying power to the RF receiver 10 in a set frame period, and the decoding means includes a cap code and an address of a set frame. Compare the data and output the message data as binary data when it is its own address.

The memory 40 is a memory for providing information of the wide area pager, and may use an EEPROM. The information stored in the memory 15 is a dummy capcode for allowing all wide area pagers to receive immediately following region data, a capcode composed of unique address data and region data including region information, and a region channel. Reference channel frequencies for setting the channel information, and service channel frequencies for receiving a radio calling service in an area set by the reference channel frequency.

The controller 30 outputs data of the memory 40 according to the local judgment mode and the normal mode, and analyzes the data output from the decoding means of the decoder 20 to control the service function of the wide area pager. The controller 30 accesses the dummy cap code and reference channel data from the memory 40 in the region determination mode and outputs the dummy cap code and the reference channel data to the decoding means of the decoder 20 and the frequency synthesizer 50. The region data output from the decoding means of 20) is analyzed to determine the region in which the wide area pager is currently located. After determining the current region in the region determination mode, the controller 30 accesses the cap code and the service channel data of the region in the memory 40 to decode means and frequency synthesizer 50 of the decoder 20, respectively. ) To execute normal mode.

The frequency synthesizer 50 inputs the channel data output from the controller 30 to interrupt the control voltage for generating the channel frequency, and the RF signal received through the antenna. A tuner 52 for tuning to a designated channel, a voltage controlled oscillator 53 for generating a frequency in accordance with a control voltage output from the PLL circuit 51, and an output of the oscillator 53 The multiplier 54 generates a channel frequency and outputs the multiplier 54 to the mixer 13. The frequency synthesizer 50 designates a channel of the RF receiver 10 according to the channel data output from the controller 30. The channel data are reference channel frequencies for designating a reference channel frequency of a regional area and service channel frequencies for radio calling service of a wide area subscriber.

The display unit 60 displays various situations and received messages generated during the wireless call service under the control of the controller 30. The display unit 60 may be an LCD. The alarm unit 70 generates an alarm signal when receiving a message under the control of the controller 30. The alarm unit 70 includes a buzzer 72 for generating an alarm sound, a motor 71 for generating a vibration signal, and the like.

5 is a flowchart illustrating the operation of the local decision mode in the wide area pager according to the present invention.

Referring to FIG. 5, first, when the power is turned on in the power-off state or when the wide area pager is moved to another station, the controller 30 performs an operation of searching for an area where the current location is located. First, in step 511, the controller 30 drives a timer to set a reception time of a dummy cap code in the currently set reference channel. The controller 30 outputs reference channel data to the frequency synthesizer 50 and controls the memory 30 to output a dummy cap code to the decoder 20. The RF receiver 10 then outputs the call information received in synchronization with the reference channel frequency to the decoder 20, and the decoder 20 compares the received information with the dummy cap code. At this time, the controller 30 checks whether the decoder 20 detects a dummy cap code in step 513. If the detection signal of the dummy cap code is not received, the controller 30 checks whether the driving time of the timer has expired in step 515. At this time, if the driving time of the timer has not ended, the process returns to step 513 and the presence or absence of a dummy cap code is checked while maintaining the currently set reference channel.

However, if the dummy cap code is not detected to exceed the driving time of the timer in step 515, the controller 30 detects it in step 515, and accesses data of the next reference channel in the memory 40 in step 517. And output to the frequency synthesizer 50. The RF receiver 10 then sets the changed reference channel. By repeating the above process, the region is searched while sequentially scanning the reference channel in units of a driving cycle of the timer.

On the other hand, when the decoder 20 detects the dummy capcode, the decoder 20 outputs the region data continuously received following the dummy capcode to the controller 30 in the same manner as a general capcode. Therefore, when the control unit 30 confirms the detection of the dummy cap code on the arbitrary reference channel in step 513, in step 519, the controller 30 receives the area data output from the decoder 20, analyzes the received area data, and Determine the territorial area where the wide area pager is located. After checking the region right, the controller 30 controls the memory 40 in step 512 and accesses the service channel data corresponding to the region data to output the frequency synthesizer 50. Then, the wide area pager is in a state in which the service channel frequency of the region currently located is set. Therefore, the controller 30 proceeds to step 523 to perform a normal mode for performing a general wireless call service. In the normal mode, the controller 30 outputs service channel data of a corresponding region to the frequency synthesizer 50 and outputs a cap code to the decoder 20.

As described above, in a system for performing a wide area wireless call service, the transmitting side periodically outputs radio call information in which each frame consists only of dummy capcodes and region data at regular time intervals, so that the wireless pager receives a local cap upon inputting a dummy capcode. After analyzing the data, it is possible to determine the current zone and to perform general wireless calling service through the service channel of the corresponding area. Therefore, the wide area pager automatically determines the area in which it is located, and there is an advantage that the wireless area service can be efficiently performed by quickly executing the wide area decision.

Claims (2)

Wide area wireless calling, where the sending device transmits the first call information, which is composed of dummy cap code and regional data only, and is transmitted over the entire frame of the batch at regular intervals, and the second call information, wherein the frame is made of cap code and message data. In the local judging method of the wide area pager in the system, in the local judging mode, the receiving unit sets the receiving unit to the reference channel frequency and waits for data reception; Checking whether there is a reception, receiving and determining the following regional data when the dummy cap code is received, and setting the receiving unit to a service channel corresponding to the determined regional zone, and then transitioning to the normal mode. A method for determining a local location of a wide area radio call receiver, characterized in that. Wide area wireless calling, where the transmitting device transmits the first call information each frame is composed only of dummy cap code and region data, and is transmitted over all frames of the batch at regular intervals, and the second call information including the cap code and message data of the frame. In a system for determining a region of a wireless wide area pager, a process of driving a timer for region determination, a process of setting a receiver to a reference channel frequency and waiting for data reception in a region determination mode, and a reference channel set in the standby process Checking whether or not the dummy cap code is received in a self frame period, and setting the receiver to a next reference channel frequency when the dummy cap code is not received in the reference channel set during the timer driving period in the checking process. Waiting for data reception, and upon receiving dummy capcode during the inspection Receiving a local data subsequent to the determination; and setting the receiver to a service channel corresponding to the determined local area, and then transitioning to the normal mode.