KR100191925B1 - Data sequence structure for wide-area paging system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a data sequence in which a cap code can be used redundantly in a broadband wireless paging system. The data sequence of the present invention is composed of a plurality of consecutive arrangements following a preamble and a preamble, each arrangement being composed of 32-bit synchronous code words and 8 frames each of 64 bits, Wherein the address code word comprises at least 18 bits of address data and the message code word comprises at least 20 bits of message data in a sequence of POCSAG data, And the special code is included in the message data position included in the message code word located in the message code word. Here, the special data codeword consists of the subscription area code and the radio channel code. Therefore, in addition to the conventional user's cap code, the area code and the radio channel code are used together in the form of a new cap code, thereby enabling use of the same cap code in other areas.

Description

Structure of data sequence for wide area wireless paging system

Figures 1a-1e illustrate the structure of a data sequence for a conventional paging system;

FIG. 2 is a diagram showing the structure of a special code which is a feature of a data sequence for a wide area wireless paging system according to the present invention; FIG.

Figures 3a-3b illustrate examples of data sequence structures for a wide area wireless paging system in accordance with the present invention.

FIG. 4 is a diagram showing an example of redundant utilization of a cap code; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

110: POCSAG data sequence 120: batch

130: address code word 140: message code word

150: idle code word 200: special code

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a data sequence used in a wireless paging system, and more particularly, to a structure of a data sequence that can be used overlapping a cap code in a broadband wireless paging system.

The data sequence used in the current paging system is POCSAG. As shown in FIG. 1A, the structure of the POCSAG includes 576-bit preamble and N consecutive arrangements after the preamble. Each arrangement consists of a sync code word and eight frames, as shown in FIG. 1b, where the sync code word consists of 32 bits and each frame consists of 64 bits. The synchronous code word means a synchronous signal for searching for a frame in each batch, and this value is fixed to 7CD215D8 (hexadecimal). One frame includes two 32-bit code words, and the 32-bit code word includes an address code word, a message code word, or an idle code word.

Referring to FIG. 1C, the address code word is composed of a flag of 1 bit, address data of 18 bits, function code of 2 bits, error check data of 10 bits, and 1 bit of even parity. When the code word is an address code word, the flag of 1 bit is 0 (binary number).

Referring to FIG. 1d, the message code word consists of a flag of 1 bit, message data of 20 bits, error check data of 10 bits, and 1 bit of even parity. When the code word is a message code word, the flag of 1 bit is 1 (binary number).

Referring to FIG. 1e, the idle codeword consists of a 1-bit flag, 20-bit idle data, 10-bit error check data, and 1-bit even parity. When the codeword is an idle codeword, the 1-bit flag is 0 (binary) and the idle data is fixed to 7A89C197 (hexadecimal).

On the other hand, in the structure of the POCSAG, the structure of the arrangement is set as one synchronous code word and eight frames are the lower three bits of the 21-bit identification code (hereinafter, referred to as CAPCODE) in the POCSAG So as to implement one belonging to one. That is, the cap code belongs to the frame 0 to the frame 7 according to the lower three bits, that is, 000, 001, 010, 011, 100, 101, The upper 18 bits of the cap code are inputted as the address data of the address code word at the position of the frame set in the lower 3 bits out of the 21 bits of the cap code.

The maximum number of cap codes that can be accommodated in one radio (RF) channel depends on the capacity of the cap code in POCSAG. The cap code is 21 bits, so 2 ²¹ is about 2,097,152. However, in the method used in Korea, since the upper two digits (decimal number) of the cap code are written as the value indicating the area, the number of cap codes that can be used in one wireless channel in each region is only about 100,000. Also, due to the wide area, in one area, the number of cap codes that can be used in one radio channel is limited. For example, since the number of wireless channels in the Seoul area is large, the cap codes accommodated in the respective wireless channels may be the same, and the portable cap codes can not be simultaneously accommodated in the service wireless channel of the other area.

In other words, since a large number of subscribers are required in a metropolitan area such as Seoul, a large number of wireless channels are required. In this case, a person having the same cap code is generated in this region. It is impossible to use wireless channels at the same time in small local cities. In order to overcome this problem, the same number of wireless channels as in the metropolitan area should be installed in small and medium cities, which has a problem of low installation cost and poor operating efficiency of the calling system.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wireless communication method and a wireless communication method that can solve a problem of the related art by using a special code together with a cap code, In an area of a relatively small wireless channel at the same time.

In order to achieve the above objects and other objects, there is provided a method comprising the steps of: arranging a plurality of consecutive arrangements after a preamble and a preamble, each arrangement having a synchronous code word and eight frames each of which includes an address code word or a message code word Wherein the address code word comprises a flag indicating address, address data, a function code, error check data and a parity bit, the message code word having a flag indicating message, message data, error check data and parity bits A special code is included in the message data location included in the message code word located next to the address code word in the POCSAG data sequence.

Here, the special data codeword consists of the subscription area code and the radio channel code. Therefore, in addition to the conventional user's cap code, the area code and the radio channel code are used together in the form of a new cap code, thereby enabling use of the same cap code in other areas.

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

FIG. 2 shows a structure of a special code for enabling overlapping use of a cap code according to the present invention. As shown in FIG. 2, the special code for identifying a user using the same cap code is composed of a subscriber's area code (or home area code) and a radio channel code. The subscription area code is set to include at least ten currently operating areas, and the radio channel code is set to include more than the number of currently operating radio channels. As described above, when the special code is used together with the cap code, the identification ability of the wireless call user becomes a product of the number of cap codes, the number of area codes to be subscribed and the number of wireless channel codes, Even when the service is requested, the wireless paging service can be provided without any problem. Referring to FIG. 4, it is schematically illustrated that the same cap code can be used for the number of subscription areas and the number of channel codes included in the special code. As shown in FIG. 2b, If there is a region with a wireless channel (A, B, C, D, E) and a region with one service radio channel (A '), If a user with a cap code of a moves from one region to another in the C channel of the user and the other region, the user in the region is identified by a special code. In other words, if a user who is a cap code in a B channel in a branch is identified as a ', the extended cap code (cap code + special code) in a region is identified as a' = a + branch + B channel , The user who is the cap code in the C channel of the branch is identified as a = a + branch + C channel if a cap code (cap code + special code)

Referring to FIGS. 3a through 3d, an example of a data sequence for a wide area wireless paging system according to the present invention. The basic assumption in this example is that the caller sends a 2563452 (decimal) message, the pager owner's cap code is 1234567 (decimal), the home channel is Seoul, and the POCSAG data when the radio channel code is 30 Sequence (see also Fig. 3a).

Since the cap code 1234567d (where d represents the decimal number) is 12D687h (where h is the hexadecimal number), the frame number into which the address code word is input becomes 7 frames by the lower 3 bits of the cap code, Is formed by the upper 18 bits of the code, the binary number is 100101101011010000 as shown in FIG. 3B. The special code is transmitted in the form of a message codeword. In the present embodiment, the message data of the message codeword includes a 2-digit message (2d, 5d) (see also FIG. 3c) in addition to the special code. While the rest of the message is sent in the next frame (see also Fig. 3d).

In the structure of the data sequence of the wide area wireless paging system according to the present invention, by using the special code in the message code word as an extended code of the cap code in addition to the cap code input in the address code word, Even if a user having a code moves to another area where the number of channels is relatively large, it is identified as an extended cap code.

Claims (8)

Each comprising a synchronous code word and eight frames, each of said frames comprising an address codeword or a message codeword, said address codeword comprising an address < RTI ID = 0.0 > Wherein the message code word is a POCSAG data sequence having a flag indicating message, message data, error check data, and a parity bit, the address data, the function code, the error check data and the parity bit, And a special code is included in the message data position included in the message code word located next to the code word. The data sequence structure for a wide area wireless paging system according to claim 1, wherein the special code is composed of a subscription area code and a wireless channel code. 3. The data sequence structure of claim 2, wherein each frame comprises two code words of the address codeword, the message codeword, or the idle codeword. 4. The data sequence structure as claimed in claim 3, wherein the idle code word is composed of a flag of 1 bit, 20 bits of idle data, 10 bits of error check data and 1 bit of parity bits. 5. The data sequence structure of claim 4, wherein the sync code word and the idle data are predetermined values. 6. The data sequence structure for a wide area wireless telecommunication system according to claim 5, wherein the message code of the message code word to which the special code is input includes a part of the message data of the caller in addition to the special code. 7. The data sequence structure as claimed in claim 6, wherein 4 bits are allocated to the subscriber area code and 8 bits are allocated to the radio channel code in the special code. The method as claimed in claim 7, wherein the flag of the address code word is 0, the flag of the message code word is 1, and the flag of the message code word including the special code is 1 Sequence structure.