JPS6387837A - Radio data communication system - Google Patents

Abstract

PURPOSE:To easily realize the expansion of a service area by providing a portable radio data terminal equipment using a weak radio wave and a private radio station in mixture in one and some system and sending data from the terminal equipment via a relay radio station. CONSTITUTION:The private radio station 8 sending a receptible data at a prescribed area including plural service areas R1-R6 and weak radio relay stations R11-R15 coupled with the station 8 through a transmission line and using one of plural service areas R1-R6 as one area constitute a fixed radio station network. In the transmission of data to data communication portable radio data terminal equipments 9-16 using plural weak radio waves, a transmission radio wave exceeding the weak radio wave sent by the station 8 is used and the data by the weak radio wave from the portable radio data terminal equipments 9-16 is sent to the station 8 via the relay radio stations R11-R15. Thus, an independent data channel is formed between the portable radio data terminal equipments 9-16 and the station 8 to attain data communication without interference with other communication line.

Description

Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to a system that uses weak radio waves for wirelessly connecting data transmission between computers, OA terminals, personal computer handy data terminals, etc. Conventional technology and its problems) Portable wireless data terminal communication using weak radio waves has traditionally been used in the distribution industry.
As shown in Figure (a), a pair of wireless data terminals (radio device + screw terminal) are constructed, one of which is light and compact for portability, or has an integrated structure for convenient portability. wireless data terminals (which are often used) are used to transmit and receive data wirelessly with other wireless data terminals.

Alternatively, when the amount of data communication becomes large or the service area becomes wide and it is necessary to perform efficient data communication, a fixed station A as shown in FIG. Devices that perform 1-to-N communication in which multiple terminals are connected have also been used (in this case, fixed station A uses the CPU as a control unit, and 81 to ON are used as fixed or mobile terminals). ). In addition, the method of using radio waves (frequency) is 1D V channel (1 wave of transmitting frequency and 1 wave of receiving frequency),
There are various methods such as minority channel (having 2 to 3 waves as transmitting and receiving frequencies) and multi-channel access (frequency synthesis is generated under the control of the control unit), and transmitting and receiving frequencies v11o - covering several 1000 frequencies as 3 frequencies). In this case, simplex and duplex systems have been used. There are two types of modulation methods: one using subcarriers and the other using direct modulation. For those using subcarriers, MSK modulation with a signal rate of 1.200bpS or 2.400bpS is common, and MSK modulation with a signal rate of 4. ,800b
The PS version uses direct FSK modulation.

In addition, the data terminal unit DTE shown in Figure 1 (a) or Figure 1 (b) includes a keyboard for inputting characters and numbers, a display unit such as a CRT or printer, a signal receiving unit, and a sounder. Although voice communication cannot be performed, the terminal is configured so that characters and numbers can be displayed on the display and data communication can be carried out between terminal operators.

In actual use, for example, in a QR in the food distribution industry, various types of food products are stocked for wholesale to supermarkets, and the fixed station A in Figure 1(b) is used as the parent wireless base station. In such a case, the instructor at fixed station A will check the data terminals carried by a specific worker among the workers who carry portable wireless data terminals in each corridor within the station.
11 Send D and the name of the specified product, number of items in stock, number of items shipped, etc. in numerical or character data such as alphabets.

In the data terminal owned by the specific worker who received this, the speaker sounds in response to the incoming call signal, and the above-mentioned instructions are printed and output on the display circuit or printer. Upon receiving this, a specific worker moves to the designated location of the item, checks whether the item is in stock (number of items) and the number of items shipped, and responds to the wireless base station.

At the same time, the shipping procedure will be completed.

The response signal from the worker is sent in the form of a data signal to the wireless base station, which is the master station, and is displayed on the ringer display circuit at the data terminal DTE of the wireless base station or outputted by a printer or the like.

The usable service area of such a portable data radio is approximately 75 meters in radius from the fixed antenna. This uses so-called weak radio waves, which are stipulated by the Radio Law, as the transmission output of portable data radios, and does not require a radio station license, thus allowing the use of economical radios.

In other words, according to Article 6 of the Radio Law Enforcement Regulations, as a radio station that does not require a license, "the radio equipment of the radio station [+!A to 100
At a distance of 15 meters, the electric field strength is 15 meters per meter.
In accordance with this regulation, the above-mentioned fi! When using a band data radio,
Although the cost of the equipment is low, the relative distance between the portable data radio and the radio station that can communicate with it is limited to a maximum of about 75 meters. Therefore, when a wider service area is required, antenna distribution, various repeaters (distributed transceivers,
It was necessary to secure a wide area service area using a two-way booster, etc.

However, in order to expand the service area using the above technology, a large number of fixed wireless stations are required. Particular attention had to be paid to the placement of fixed stations to avoid so-called dead areas, where reception was impossible. Conversely, if there is an area where radio waves from both fixed stations can be received, this area will be subject to radio interference, so it is necessary to use different frequencies for each station. In addition, the center must have the ability to manage the frequencies used throughout the service area and allocate channels that do not cause interference to mobile data radios that wish to make calls, which inevitably increases the system cost. Ta.

However, recently in Japan, compared to the above-mentioned weak radio wave radio equipment called premises radio stations, relatively large electric power (
Devices with a power output of approximately 10mW (at the transmitter output end) can now be approved with just a simple radio station license procedure.

When using this premises wireless station, the service area is 30077 radial from the main station antenna outdoors. Indoors, the radius will be widened to 100 m, and a new system like the present invention that is economical, can be applied to a vast service area, and has high frequency efficiency can be realized. It has become possible.

(Objective of the Invention) The present invention is designed to provide the same functionality as the conventionally used portable wireless data terminal using weak radio waves and the currently institutionalized low-power wireless installation (referred to as a premises wireless station). By mixing data in the system, it is possible to receive data transmitted from a large number of portable wireless data terminals for data communication in the entire area including multiple service areas, and also to receive data transmitted from the large number of portable wireless data terminals. A wireless data communication method that is carried out within each service area, forms an independent data communication path between a mobile wireless data terminal and a premises radio station, and allows data communication to be performed without interference with other communication paths. It provides:

(Structure and operation of the invention) The present invention will be explained in detail below with reference to the drawings.

FIG. 2 is a layout diagram showing one basic configuration of the system of the present invention.

In FIG. 2, reference numeral 8 denotes a data communication premises radio station where a conductor is stationed, and is composed of a radio transmitting/receiving section, a data transmitting/receiving section, and a data input/output section.

That is, the data signals sent from each data communication 1% band wireless data terminal of the data communication partner are displayed on a display or the like for each mobile wireless data terminal (by ID). In addition to having a keyboard and display section for giving instructions to each mobile wireless data terminal, it also has a data processing function that allows primary processing of received data signals.
It is also possible to send processing signals to a processing center located elsewhere for secondary processing. Conversely, it is also possible to receive signals from a processing center located at a remote location. 9-1
6 is a mobile wireless data terminal for data communication owned by each worker, R1-[(6 is each service area, R is the entire area including multiple service areas R1 to R6, R1'l
~R15 are relay radio stations installed in each service area R1~R5. If the portable wireless data terminal for data communication owned by the worker uses multi-channel access (hereinafter referred to as rMcAJ) technology, which has been recently developed and is widely used in various wireless systems, especially mobile wireless systems, As will be described later, it is possible to provide high-quality services as a system, but the present invention does not necessarily require the use of such high technology; It is also applicable to those limited to ~2 waves. Therefore, the following explanation will be made using the latter simple system as an example.

Now, there is a conductor at the premises radio station 8 in the center of Figure 2.
Suppose that it is desired to give work instructions to workers in area R (large circle) that includes a plurality of service areas in FIG.

Area R in FIG. 2 indicates an area where the frequency F1 emitted from the premises wireless station 8 can be received, and the mobile wireless data terminals in this area, numbering 9 to 16, can receive the transmitted radio waves from the premises wireless station 8 well. I will do what I can.

FIG. 3(a) shows the configuration of a portable wireless data terminal. The number of mobile wireless data terminals is the wireless transmitter/receiver section.

Consists of a data transmission/reception control section and a data input/output section,
The input radio wave from the antenna ANT of the radio transmitting/receiving section is divided into two by the duplexer DPX, and then sent to the receiving section RX via the upper path.
Enter. Here, the signal is amplified and demodulated in the next demodulator DEI-1. This output enters the data transmission/reception control unit DAC. The information stored in the register section REG in the data transmission/reception control section DAC is then controlled by the control section C0NT from the controller CPU. Data display DI
Display SP.

On the other hand, transmission from the portable wireless data terminal □ for data communication to the premises radio station is input from the keyboard KBD in the data distribution section, and the ID number is assigned by the data transmission/reception control section DAC at the ID @ number detection addition section IDC. It will be done. After inputting the necessary information, the data is input to the modulator 10D by turning on the transmitter, and after passing through the transmitter X and the duplexer DPX, it is transmitted from the antenna ANT. In the portable wireless data terminal shown in FIG. 3 (a) described above, the wireless device and the terminal are housed in a single housing to improve flexibility. FIG. 3(b) shows the configuration of the premises wireless station 8.

Among the symbols shown in the same figure, the same ones as in Figure 3 (a>) indicate the same contents.The configuration of the premises radio station is that the radio transmitting/receiving section and the data transmitting/receiving control section are the same as that of the portable wireless data terminal. However, the data input/output section has an interface with the data processing center from the data transmission/reception control section DAC through the modem section 1-fODEM in the upper right corner of the figure.
The output of the data signal demodulator DEH has an interface with the relay radio stations R11 to R15 shown in FIG. 3(C). FIG. 3(C) shows the configuration of relay radio stations R11 to R15. The relay radio station is composed of a radio reception section, a data reception control section, and a data output section. It is similar to

FIG. 4 shows the format of data transmitted and received between the portable wireless data terminal and the premises wireless station described above.

Now that the hardware configuration of each station has been explained above, the system operation will be explained below. In Figure 2, each service area R1~ is surrounded by six small circles within the area premises.
R6 indicates that if there are mobile wireless data terminals 9 to 16 within the service area, the radio waves (weak radio waves) transmitted from these mobile wireless data terminals will be transmitted to relay radio stations R11 to R15 within each service area. and shows the range that can be well received by the on-premises radio station 8.The on-premises radio station 8 also has a receiver capable of receiving radio waves from the mobile wireless data terminals 9-16, as well as each relay radio station R11-R15. At the same time, each of the relay radio stations R11 to R15 and the premises radio station 8 are connected by wired or wireless transmission paths.The installation positions of these relay radio stations R11 to R15 At the actual work site, etc., it is necessary to install the data processing equipment in a large warehouse, a station for the worker,
They are installed at locations that are important for carrying out work, such as collection and distribution points for distributed goods, and locations with good radio wave propagation characteristics.

Under the above conditions, each of the workers 9 to 16 can receive instructions from the work leader anywhere within the area. Therefore, unless there is a need to respond by oneself, the worker can continue the work at any location within the area shown in FIG. 2 while receiving instructions from the work leader.

That is, in FIG. 2, it is assumed that the work leader wants to give instructions to the worker 10. The conductor transfers the data from the data output section 73 in the premises radio station 8 to the mobile radio data carried by the worker 10 1:
Enter the ID number and instructions of the last person from the keyboard kBD and display them on the display DISP.

Is there a mistake in the ID number and instructions? This signal contains the ID information of the mobile wireless data terminal.
The receiver operates only on the portable wireless data terminal (in this case, the portable wireless data terminal of worker 10) with which the signals match. Therefore, only the receiver of the worker 10 is activated, and the ringer 8Z rings to notify the worker 10 that a signal has arrived from the in-plant wireless station 8.

Next, assume that the worker who owns the portable wireless data terminal 9 needs to respond to the task leader. In this case, if it is located in one of the six service areas 17R1 to R6, for example, the relay radio station R in the old central area.
It is possible to communicate with the in-plant wireless station 8 via the wireless terminal 11 at the transmission frequency f1, which is common to all portable wireless data terminals. However, it is assumed that no prior communication is taking place at the relay radio station R11. In this case, even if other mobile wireless data terminals communicate with the premises wireless station 8 via the respective relay wireless stations using the same radio frequency f1 within the other relay wireless station service areas R2-R6, No radio interference occurs.

This is an advantage because it is a weak radio wave, and as shown in the figure, R1
-R6 are independent from each other and are separated from each other from each area.

On the other hand, workers also send signals to the work commander to receive work reports and instructions. The specific worker 10 is required to check the quality and amount of goods in stock within the area assigned to him or her, and if there is any abnormality, report or request instructions. To send, press the keyboard KBD, which includes alphabet keys and numeric keys, provided on the mobile wireless data terminal, and press the display DIS
After displaying the information on P and clicking the contents, when the transmitting switch of the portable wireless data terminal 9 is pressed, a radio wave addressed to the relay wireless station is emitted. This radio wave is modulated with the ID information of the portable wireless data terminal owned by the user, followed by the content shown on the display device DISP, in the form of a data signal. The premises radio station 8 receives this radio wave via the relay radio station, and after demodulating, the report from the mobile radio data terminal 9 is displayed on the display DI.
Displayed on SP. Upon seeing this, the work instructor uses a data input/output unit such as 80 on the keyboard to send an instruction signal from the premises radio station 8 to the portable radio data terminal 9 in the form of a data signal. Upon receiving this, the worker can obtain instructions from the instructor and begin the next task.

(Effects of the invention) By using the present invention as a substitute for the conventional wireless data communication system, it will become possible to expand the service area, which has been economically or technically difficult to realize until now. , low-power radio equipment, and radio equipment that uses W1 weak radio waves, making it possible to effectively utilize frequencies and constructing an economical system, resulting in improved work efficiency and performance. It is clear that a significant contribution can be made.

[Brief explanation of the drawing]

Fig. 1 (a> or (b) is a schematic diagram showing an overview of a conventional system, Fig. 2 is an explanatory diagram showing an embodiment, and Fig. 3 (a> (
b) and (c) are block diagrams of the embodiment, and FIG. 4 is a diagram showing an example of a data transmission format. 8......Indoor wireless station, 9.10, 11, 12, 13.14. '15.16...
...Mobile wireless data terminal, R... Entire area, R1, R2, R3, R4, R5, R6... Service area, R11, R12, R13, R14, R15.・・・・・・
Relay radio station. Patent applicant Iwasaki Tsuushin Co., Ltd. Figure 1 (α) (b) Figure χ Figure 3 (α) ANT: Y'-/Tepoo
F? EG: Tailoring screen 8:lPX
: Te1. -7 Lexa C
0NT: Obstacle 4 Knowledge R
: 151g x auan CPLI
: ]:, z)-0-ra OEM:〒-2IeNo.4
I arrogant 11EH5P; kfJ Mi4M0D;
Datai kugo ukeshu 1ffi KBE):
Keyboard MOQEM: Te'-9ikichigoi71
Lesson 1f JBE+: PS-Figure 3 (b
) Tie-Tie Otsusho I! Official document (method) for the procedure for the 9-7 saucer V. February 17, 1985 Akira Kuroda, Commissioner of the Patent Office 1. Indication of the case Patent application No. 232925 of 1988 2. Title of the invention Wireless data communication Form 3. Relationship with the case of the person making the amendment Patent applicant 4. Date of amendment order January 27, 1985 (shipment date) 5. Subject of amendment (1) "Brief explanation of drawings" in the specification Column (2) “Figure 3 (b) and Figure 3 (C)” of the drawings 6. Contents of amendment (1) Page 16 of the specification, lines 12 and 13 “Figure 2...”・Configuration diagram, ``Figure 2 is an explanatory diagram showing an embodiment of the wireless data communication system of the present invention, Figure 3 is a configuration diagram of each device constituting the wireless data communication system of the present invention, (a)
is a configuration example of a portable wireless data terminal, (b) is a configuration example of a premises wireless station, and (C) is a configuration example of a relay wireless station.'' (2) Figures 3(b) and 3(C) of the drawings shall be amended as shown in the attached sheet.

Claims (1)

[Claims] A premises radio station that transmits data receivable in a predetermined area including a plurality of service areas, and a weak radio wave relay radio that is coupled to the premises radio station via a transmission path and whose area is one of the plurality of service areas. The station constitutes a fixed wireless station network, and data transmission to a portable wireless data terminal for data communication using a plurality of weak radio waves existing in an area including the plurality of service areas is transmitted at the premises radio station. Transmission radio waves exceeding the weak radio waves are used, and data transmission using weak radio waves from each of the data communication portable wireless data terminals is transmitted to the premises radio via one of the weak radio wave relay radio stations in the plurality of service areas. A wireless data communication system configured to communicate with stations.