KR0142948B1 - Pager - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

A regional recognition circuit and method of a wide area radio call receiver.

2. The technical problem to be solved by the invention

When one or more regional data is detected while scanning the reference channel to determine the current position, the control unit must have analog / digital conversion function based on the field strength determination function of the RF unit to determine which one is detected. It is intended to solve the problem of complicated circuit configuration.

3. Summary of Solution Circuit and Method of the Invention

In the area recognition circuit and method of the wide area wireless paging receiver, an operation for detecting one or more area data and error data corresponding to the area data from data received in a frame by tuning to an arbitrary reference channel is performed for all channels. And a second process of comparing the number of errors corresponding to each of the regional data of all channels, selecting local data having the smallest number, and a third tuning of the selected local data to the detected channel. It is characterized by consisting of a process.

4. Important uses of the invention

If more than one area data is detected, it is used to determine the area simply by comparing the error number of each area data without direct field strength determination.

Description

Area Recognition Circuit and Method of Wide Area Radio Receiver

1 is a block diagram of a wide area wireless calling system

2 is a block diagram of a general wide area wireless page receiver

3 is a diagram illustrating regional reference channel frequencies, cap codes, and service channels.

4 is a diagram of a POCSAG code used in a radio call receiver

5 is a diagram illustrating the location of a subscriber by means of a band diagram.

6 is a flowchart illustrating a region recognition process of a wide area wireless paging receiver according to the present invention.

* Explanation of symbols for main parts of the drawings

10: key input section 11: RF section

12: decoder 13: control unit

14: frequency synthesizer 15: memory

16: display part 17: alarm part

The present invention relates to a region recognition circuit and a method in a wide area wireless paging receiver. In particular, when one or more region data are detected while scanning a reference channel for current position determination, the present invention does not rely on direct field strength determination. The present invention relates to a circuit and a method for enabling position determination by comparing the number of errors of each area data.

In order to enable the wireless paging service even in a limited area, the wide area paging service needs to divide the nationwide by the administrative area and establish the subscriber's database and the data network. Referring to FIG. 1, after dividing into nine regions from Seoul (Gyeonggi) to Jeju, each region has a subscriber database, and each region is linked to each other by No. 7 network.

When constructing the wide area wireless calling system, the following two methods are considered. One is to use different channels according to the operational aspects of the channel, and the other is to use one channel for all regions. The use of the same channel in all the regions has many problems such as difficulty in simulcast, increased equipment of transmitters, and confusion in overlapping areas. On the other hand, the method of using a different channel for each region does not need to install additional channels for each region and can be used as a currently operating channel, but requires a radio call receiver capable of receiving multiple channels.

Currently, a method using a multi-channel receiving terminal is adopted. Looking at the service method, a wide area service is a service that transmits call data to all regions of the country, and there are many problems in efficiency.

The multi area service registers and services only the area desired by the subscriber. The option area service registers its location in the system after the subscriber moves the area, and subsequent call data is provided only to the registered area.

2 is a configuration diagram of a general wide area wireless call receiver, wherein the key input unit 10 is composed of keys for generating various control signals of the wireless call receiver. The keys may include, for example, a power key for turning on / off a power of a wireless call receiver, a mode key for implementing various operations and functions, and a lead key for displaying a received message. The RF unit 11 is assigned a channel by the frequency synthesizer 14, amplifies the weak RF signal of the specified channel received through the antenna, and converts the amplified signal into the original signal band and demodulates the demodulated signal. The waveform is formatted by digital data and output.

The decoder 12 decodes and outputs the digitally coded data output from the RF unit 11. That is, the received code and data (usually BCH coded data) are decoded into the original data, and the preamble data, the word sync, and its frame data are detected and output in the form of a bread code as shown in FIG. .

The memory 15 is a memory for storing information of the radio call receiver, and may use an E ² PROM. The information stored in the memory 15 includes cap code, which is address data for selecting and receiving data, reference channel frequencies for setting channels in a region, and receiving radio calling service in a region set by the reference channel frequency. Store service channel frequencies. The controller 13 analyzes the information in the memory 15 to control the call service function of the radio page receiver. First, upon receiving the power key on signal from the key input unit 10, the controller 13 performs a channel scan function for initial driving.

That is, the controller 13 sequentially selects reference channel frequencies accessed from the memory 15, designates a channel by outputting the selected reference channel frequency at a predetermined period, and checks the reception of data from the designated channel. In this case, when data is received, the region information included in the cap code is analyzed to determine the region where the current wireless call receiver is located, and then the service channel frequency of the region is output to analyze the frame data received from the designated service channel.

A frequency synthesizer 14 designates a channel of the RF unit 11 according to the channel data output from the controller 13. The channel data are reference channel frequencies for specifying a reference channel frequency of a regional area and service channel frequencies for radio calling service of a wide area network subscriber.

The display unit 16 displays various situations and received messages generated during the radio call service under the control of the control unit 13. The display unit 16 may be implemented as an LCD. The alarm unit 17 generates an alarm signal when a message is received under the control of the controller 13. The alarm unit 17 includes means for generating an alarm sound, a vibrator for generating a vibration signal, and the like.

The configuration of the memory 15 will be described in detail. The memory 15 stores a cap code of a receiver, a reference channel frequency, a service channel frequency, and the like. In detail, the memory 15 includes an area for storing a cap code, an area for storing a reference channel frequency, and an area for storing a service channel frequency. A plurality of cap codes are stored in the cap code storage area, and the cap codes are unique addresses and group addresses of the radio page receiver.

In the case of a radio call receiver that is used alone, only a cap code is normally required. A plurality of reference data is stored in the reference channel frequency storage area, and the reference data correspond to the number of assigned common area groups. A plurality of service channel frequencies are stored in the service channel frequency storage area. The service channel frequency is a frequency at which a wide area network subscriber can actually receive a radio call service, and assigns a plurality of service channel frequencies to one reference channel frequency. Can be.

The service channel frequencies stored in the memory 15 of the wide area network subscriber are actually composed of numbers corresponding to the respective territories in which the subscriber receives the radio calling service. Assuming the case of nine territories, the first to ninth service channel frequencies will be provided.

The term reference channel frequency as used herein refers to PLL data of the frequency synthesizer as frequency channel data that the wide area pager can receive region data to find an area. The term service channel frequency refers to PLL data of a frequency synthesizer as frequency channel data through which a wide area network subscriber can receive his or her own data. The CAP code is a unique address of the radio call receiver, and the preceding predetermined bits have local information indicating the subregion to which the subscriber is subscribed.

A regional zone refers to an area capable of performing a radio calling service at the same frequency in a region of a predetermined size, and has a function similar to a cell in a mobile communication system. The common area group means that the zones remotely separated from each other use a common reference channel frequency. FIG. 3 shows regional reference channel frequencies, cap codes and service channels.

Figure 4 shows the form of the POCSAG code used in radio call receivers, which is currently available worldwide in the form of page-only signals and is specified in detail in CCIR Recommendation 584.

One POCSAG code consists of preamble data consisting of 576 bits and a plurality of batch data contiguous. The preamble data is a reversal code in which 1 and 0 are repeated for 576 bits. The one POCSAG code typically consists of 30 batches up to 60 batches. One batch consists of one wordsync data of 32 bits and eight frame data of 64 bits. The word sync data is 32-bit data of (7CD215D8) H and (01111100 11010010000101011101100) B.

Each frame data is composed of 32 bits of address codeword and 32 bits of message codeword. Therefore, one batch is composed of 17 words of 544 bit data (17 words * 32 bits = 544 bits) in which 32 bits of data are one word.

The preamble data is for detecting a received signal and synchronizing clock bits with the signal. The word sync data is used to match the word sync of a code word, such as an address, a message, or an idle, which is then transmitted.

When the initial power is turned on in a wide area radio call receiver or when the radio call receiver is moved to another area, the local area of the local radio call receiver should be analyzed to specify the service channel frequency of the area. Assuming that such an initial driving state is performed by an operation of a power switch, when the initial driving state occurs, the controller 13 reads the information in the memory 15. That is, the reference channel data and the service channel data are read and stored in the control unit 13. After tuning the reference channel RF unit 11, data is received and analyzed.

After that, all the reference channels are sequentially scanned to determine the current region. Then, the RF unit 11 is tuned to the service channel of the current region and the call data is received. However, the local judgment in this way, if the subscriber is located in a location that is affected by two or more regions, as shown in Figure 5 may be misrecognized. If a user subscribes to a wide area service or registers an AB area in a multi-area service, when the user's location is at '●', the call data can be received even if the service channel is tuned to A or B.

However, receiving data on the service channel of A will be less error than tuning the RF section 11 to the service channel of B to receive the data. (However, it is assumed that the total strength of each of the A, B, and C regions is highest in the center and weaker toward the edges.)

If the user subscribes to the selective area service, the call data is serviced only from either A or B, so the area must be determined more carefully. As shown in FIG. 5, when the user is located in an overlapping area of several regions, it is not easy to determine any one, which is closely related to the reception rate. In order to solve this problem, the RF unit 11 of the receiver has a RSSI (Received Signal Indicator) function to determine the electric field strength of each region, and the control unit 13 must also have an analog / digital conversion function.

Accordingly, an object of the present invention is to enable location determination by comparing the error number of each area data when one or more area data are detected when the area wireless paging receiver scans the reference channel for the current location determination and finds the area data. It is to provide a circuit and method.

According to an aspect of the present invention, there is provided a region recognition circuit and a method of a wide area wireless paging receiver, wherein at least one region data and error data corresponding to the region data are tuned from data received in a frame by tuning to an arbitrary reference channel. A first step of performing an operation of detecting a signal for all channels, a second step of comparing the number of errors corresponding to each of the area data of all channels, and selecting the area data having the smallest number; And a third process of tuning data to the detected channel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, in the following description, many specific details such as region name, region code, reference channel frequency, and number of service channel frequencies are shown, which are provided to help a more general understanding of the present invention, and without these specifics, It will be apparent to those skilled in the art that the invention may be practiced.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The configuration of the wide area wireless call receiver to which the present invention is applied, the format of the bread code and the channel frequency allocation for each region are as described above.

6 is a flowchart illustrating a region recognition process of the wide area radio page receiver according to the present invention. The radio page receiver receives data while scanning the reference channel to determine the current location. Referring to FIG. 4, when the radio call reception has received one batch of data on an arbitrary reference channel, 16 codewords are included therein.

Each codeword is 32 bits, but information decoded by the decoder 12 and delivered to the controller 13 is 24 bits. The 24 bits include each 1 bit to indicate whether the codeword is an address or a message, 20 bits of an actual address or message, 1 bit to indicate whether a BCH decoding error has occurred, and 1 bit to an even parity flag.

Therefore, the controller 13 shown in FIG. 2 analyzes the BCH decoded data transmitted from the decoder 12 in step a to check whether local data (the 20-bit real address) is received. If the regional data has been received as a result of the checking, the process proceeds to step c to store the regional data.

In step b, it is checked whether error data (1 bit and 1 even parity flag 1 bit indicating whether a BCH decoding error has occurred) is received. If there is an error as a result of the check, the process proceeds to step 1 and stores the number of the error. The total number of errors that can be represented by BCH decoding error and even parity per codeword is up to two.

Proceed to step d and confirm that scanning for all channels is completed. If it is determined that scanning of all channels is not completed, the process proceeds to step e and the receiver is tuned to the next reference channel.

On the other hand, if it is determined that scanning of all channels is completed, the process proceeds to step f and checks whether one or more regional data is present. If the result of the check is not more than one area data, go to step g to tune the receiving unit to the area corresponding to the area data. On the other hand, if there is more than one local data, go to step h and compare the number of stored errors. In step i, check whether the smallest error count can be determined.

If the determination is possible, the control proceeds to step j to tune the receiver to the channel with the smallest error. If the determination is not possible, the control proceeds to step k to control the display unit 16 and the alarm unit 17 to display the overlapped area and to generate a warning sound. In this case, the channel with the lowest number of errors will be the region with the highest electric field strength, and will actually find the region where the user is located.

As described above, in the present invention, when one or more regional data are detected while scanning a reference channel for the current position determination, the number of errors is compared by comparing the error number of each regional data without direct field strength determination. By deciding to a small area, the RF part does not have to have an electric field strength measurement function, so the control part does not have to have an analog / digital conversion function.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (8)

A region recognition method of a wide-area wireless paging receiver, comprising: performing an operation for all channels by detecting one or more region data and error data corresponding to the region data from data received in a frame by tuning to an arbitrary reference channel; And a second process of comparing the number of errors corresponding to each of the local data of all channels and selecting the smallest local data. The method of claim 1, wherein the first process comprises: analyzing the decoded data and receiving local data, and storing the local data; and analyzing the decoded data and receiving error data, the number of errors. And a third step of checking whether the scanning of all the channels is completed and determining that the scanning of all the channels is not completed, and tuning the receiver to the next reference channel. The method of claim 1, wherein the second process comprises: comparing the first step of tuning a receiver to a channel in which the corresponding regional data is detected if the regional data is one; and comparing the number of stored errors if the regional data is one or more. And a second step of checking whether a small number of errors can be determined, and a third step of tuning a receiver to a channel having the smallest error if the determination is possible. 4. The method of claim 3, further comprising visually displaying the overlap of regions if it is impossible to determine the smallest number of errors. 5. The method of any one of claims 3 or 4, further comprising alerting that the smallest number of errors is not possible. A wide area wireless paging receiver comprising decoding means for decoding data received in a frame by tuning to an arbitrary reference channel, wherein the decoding data is inputted from the decoding means to provide one or more area data and error data corresponding to the area data. A detection means for detecting a data, a storage means for storing the detected data, and a number of errors corresponding to each of the local data of all channels read from the storage means, and selecting the least local data. And means for determining a channel for detecting the selected area data as a channel to be tuned to the receiver. 7. The area recognition circuit according to claim 6, further comprising a sound generating means for generating an audible sound informing that it is impossible to determine the smallest number of errors. 8. The area recognition circuit according to any one of claims 6 to 7, further comprising display means for visually displaying the overlap of areas when the smallest number of errors cannot be determined.