JPH0833017A - Data transmitting method for radio call communication system - Google Patents

Abstract

PURPOSE:To improve transmission efficiency in the case of transmitting data by transmitting data with a function code as one part of the message data. CONSTITUTION:In this data transmitting method for a radio call transmission system, two bits of a function code 32 are encoded on the transmission side by an encoder according to the encoding format of POCSAG as one part of message data, and a carrier wave is modulated by that data signal and transmitted by radio. On the reception side, the carrier wave modulated by the data signal is received, demodulated and decoded by a decoder, and an address code and function code bits are stored in a storage device. Next, these message data are fetched and reconstructed in the order shown by the address code and function code bits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission method for a radio paging communication system which improves transmission efficiency.

[0002]

2. Description of the Related Art FIG. 4 is a data configuration diagram of a coding format of transmission data by a data transmission method of a conventional radio paging communication system using a POCSAG code. In the figure, 1 is a preamble, 2 is a sync code, and 4
Is an address code word, 4a is an ID code of an address code, 4b is a 2-bit function code, 6 is a message code word consisting of 8 frames each, and 6a to 6d use 20 bits each. It is made up of message data and its check bits. Incidentally, 3 and 7 are idle codes.

In the conventional data transmission method of the radio paging communication system using the POCSAG code, the ID code 4a is placed at the frame position corresponding to the last number of the ID code of the receiver used by the user. In the following message codeword 6, the message data is used by 20 bits per codeword and transmitted. In the address code word 4 including the 2-bit function code 4b, the function code 4b indicates that the attribute of the message data to be transmitted, the fixed text of the message data, and the content of the message data are numbers and characters. It is fixed for the purpose and used for the transmission of message data.

[0004]

Since the conventional data transmission method of the radio paging communication system is configured as described above, when a large amount of information is carried in message data and transmitted, one ID code is used. 1 by one transmission
Only four message data used for 20 bits per codeword can be sent, and in order to carry a large amount of information in the message data, the message data having the data structure shown in FIG. 4 is repeatedly transmitted. There is a problem that the transmission efficiency is not good.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a data transmission method of a radio paging communication system capable of improving the transmission efficiency.

[0006]

A data transmission method of a radio paging transmission system according to the present invention has an address code word having an address code and a function code for informing a message attribute, a character type, etc., and message data. In a data transmission method of a radio paging communication system for transmitting and receiving a message using a POCSAG code composed of a message code word, when transmitting, a message is encoded by transmitting the function code bit as a part of the message data and transmitted. Next, when receiving the transmission data, the received message is decoded, the address code and the function code bit are stored in the memory, then the message data is fetched, and the address code and the function code bit are read. Characterized by reconstructing the message data Te.

[0007]

In the data transmission method of the radio paging communication system according to the present invention, the encoder encodes the message in the POCSAG encoding format with 2 bits of the function code as a part of the message data on the transmitting side, and the carrier signal is used as the data signal. Modulate and transmit wirelessly. On the receiving side,
The carrier wave modulated by the data signal is received and demodulated,
The address code and the function code bit are decoded by the decoder and stored in the storage device. Next, this message data is fetched, and the message data is reconstructed in the order indicated by the stored address code and function code bit.

[0008]

An embodiment of the present invention will be described with reference to the drawings. FIG. 3 is an explanatory diagram showing the data structure of the POCSAG coding format format of the transmission data in the data transmission method of the wireless paging communication system of the present embodiment. In FIG.
Reference numeral 31 is an address code portion 4a of the address code word, and M ID code numbers I to M are assigned.
Reference numeral 32 denotes a function code portion 4b of the address code word, which has four function code bits "00", "01", and 1 for each ID code number.
"10" and "11" are assigned. 33 is a message code word, MD1, MD2, ... MDN
(However, N = 4M) is composed of four message code words, and each message code word is composed of 20-bit message data and check bits. This data structure is transmitted in the order shown in FIG. FIG. 2 is an explanatory diagram showing a data structure of message data transmitted in the data transmission method of the wireless paging communication system according to the present embodiment. In FIG. 2, 11 is the first ID code,
12 is a function code consisting of a 2-bit code "00" used as a part of address number information, 1
Each of 3a to 13d includes message data of 20 bits and error correction bits. 14 is the same ID as 11
Is the code. Reference numeral 15 is a function code composed of a 2-bit code "01", and 16a to 16d are respectively composed of 20-bit message data and error correction bits. 17 is the same ID code as 11. 18 is a function code consisting of a 2-bit code “10”,
Each of 19a to 19d includes message data of 20 bits and error correction bits. 20 is the same as 11
It is a D code. 21 is a function code consisting of a 2-bit code “11”, and 22a to 22d are 20 respectively.
It consists of message data consisting of bits and error correction bits. 24 is a second ID code. 25 is a function code consisting of a 2-bit code "00" used as a part of the address number information, and 26a-2
6d consists of message data consisting of 20 bits and error correction bits.

Message data 13a to 13d, message data 16a to 16d, message data 19a to
19d and the message data 22a to 22d are configured so that they can be identified by the same ID number by four kinds of function codes 12, 15, 18, and 21 obtained by combining them by 2 bits.

Next, the data transmission method of the radio paging communication system according to this embodiment will be described with reference to the flow chart of FIG. In the data transmission method of the radio paging communication system according to the present embodiment, the data is wirelessly transmitted from the radio paging transmitter to the receiver with the data structure of the format shown in FIG.

First, in step S1, it is determined whether or not there is an incoming call. When there is an incoming call, in step S2, the bits of the address number information and the function code information are extracted from the incoming call data sent and stored in the memory.
Next, in step S3, the message data is extracted and fetched. In a succeeding step S4, the message data fetched in the step S3 is reconstructed by the address number according to the address code and the function code stored in the memory in the step S2.

As described above, according to this embodiment, the 2-bit function code used as a part of the address code is made a part of the message data, so that the amount of message data to be transmitted is 4 per ID code.
The data transmission efficiency can be doubled, and as a result, the efficiency of data transmission can be improved.

[0013]

As described above, according to the present invention, data can be transmitted by making a function code a part of message data, the amount of message data can be expanded, and the transmission efficiency at the time of data transmission is improved. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a flowchart showing a configuration of a data transmission method of a radio paging communication system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a data structure of message data transmitted by the data transmission method of the radio paging communication system according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a case where message data is expanded and data is transmitted for each ID code by the data transmission method of the radio paging communication system according to the embodiment of the present invention.

FIG. 4 is a data configuration diagram showing a configuration of transmission data by a data transmission method of a conventional radio paging communication system using a POCSAG code.

[Explanation of symbols]

11, 14, 17, 20, 24, 31 ID code (address code) 12, 15, 18, 21, 32 Function code 13a to 13d, 16a to 16d, 19a to 19d, 2
2a-22d, 26a-26d, 33 Message codeword

Claims (1)

[Claims] 1. A radio for transmitting and receiving a message using a POCSAG code composed of an address codeword having an address code, a function code for informing a message attribute, a type of character, etc., and a message codeword having message data. In the data transmission method of the paging communication system, when transmitting, the function code bit is set to 1 of the message data.
When a message is encoded and transmitted as a part and then the transmitted data is received, the received message is decoded, the address code and the function code bit are stored in the memory, and then the message data is fetched,
A data transmission method for a radio paging communication system, comprising reconstructing the message data according to the address code and the function code bit.