JPS60148238A - Polling communication method from fixed station switching automatically frequency and antenna to mobile station - Google Patents

Abstract

PURPOSE:To improve the quality of a redio line independently of the position of a mobile station by setting the optimum operating frequency in advance between a fixed station and each mobile station and switching the operating frequency and an antenna to an optimum value when the fixed station calls a mobile station. CONSTITUTION:The fixed station consists of a terminal device 1, a modulator-demodulator 2, and a central station comprising transmission/reception remote controllers 3, 4, controllers 13, 16 controlled remotely via private lines 5-12, a fixed transmitter and receiver and antennas 14, 15. The optimum operating frequency, the antenna number and the call sequence of the mobile station are set to a memory in advance between the fixed station and plural mobile stations B1-Bn. After the fixed station switches the transmission/reception frequency and the antenna by means of a high speed remote control for the transmitter and the antenna 14 and the receiver and the antenna 15 via private lines 5-9 and 8-12 and the controllers 13, 16, a call code, an inquiry data and an end code are transmitted to the private lines 6-10, the response from the mobile station is received via private line 11-7 so as to switch sequentially the operating frequency and the antenna thereby attaining corresponding with plural mobile stations.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables a fixed station to automatically switch the optimal operating frequency and antenna for each mobile station for a plurality of mobile stations moving within a predicted area using a wireless communication line. The present invention relates to a polling-type digital code transmission method.

In conventional HF (short wave) lines for long-distance communication, data termination codes are transmitted due to obstacles such as fading, interference, and noise that occur in the propagation path. Bit-wise double diversity is used in methods such as , frequency diversity, etc. However, even in spaces using multiple antennas and circular wave diversity, it is necessary to install antennas several times the wavelength of the frequency used. Furthermore, with this method, when the mobile station moves, the distance, direction, and angle of incidence of radio waves between the fixed station and the mobile station change, making it difficult to obtain sufficiently good line quality.

Especially in HF lines, optimal operation (transmission and reception) between fixed stations and mobile stations
Since the frequency changes over time, once the operating frequency is determined with each mobile station, the optimal frequency will change.
Additionally, it is generally difficult to follow this trend and switch the operating frequency, and this has rarely been done. Therefore, it was clear that high-quality digital code transmission could not be achieved unless the optimum operating frequency and antenna were switched for each mobile station in a timely manner for transmission and reception. It is also known to remedy this problem by repeatedly transmitting the digital code (generally retransmission), but the drawback is that the transmission efficiency is low.

The purpose of the present invention is to improve the transmission quality of wireless lines regardless of the geographical location of each mobile station. By setting the optimal operating frequency and antenna between the fixed station and multiple mobile stations in advance, and then switching the operating frequency and antenna to the optimal value when the fixed station asks each mobile station in turn and receives a response, the fixed station and multiple mobile stations can It is characterized by being able to construct a quick and high-quality wireless transmission line using a minimum number of transmitters, receivers, and antennas, and will be described in detail below.

FIG. 1 is a polling type communication system diagram between a fixed station and multiple mobile stations, where A is the fixed station, B, , B3. B3...
Bn is the mobile station, f is the operating frequency between people and F□, and f2
is the operating frequency between A and B2, f3 is between A and B3, and fn is between A and B, respectively. These operating frequencies are automatically selected in the fixed station A in sequence.

FIG. 2 is a block diagram of an example circuit configuration of a fixed station.

1 in the figure is a terminal device that performs data processing, including a printing telegraph machine,
A reader, puncher, computer, etc. are used. 2 converts the digital signal input from the terminal device into a modulated signal for transmitting at radio frequency and outputs it to the transmitting device 6, and converts the demodulated input from the receiving device 7 into a digital signal and sends it to the terminal device. A modem or A/D-D/A code converter that has the dual role of output; 3 is a transmitter or antenna of a transmitting station located far from the central station equipment consisting of 1 to 8 in the fixed station; 4 is a receiving remote controller for remotely controlling the receiver, antenna, etc. of a receiving station located far from the central station; .6.7. '8
．． 9.10.11.12 is a device for transmitting or receiving a dedicated line (microwave line in the example in this figure) between the central office and the transmitting station or receiving station, and the dedicated line between the central office and the transmitting station is 5
-9.6-1O, where 5→9 is the microwave modulated by the signal that controls the transmission system.
The code converter 2 converts the digital code of the terminal device 1 (I) into a modulated signal, and transmits the modulated microwaves. Also, similarly expressed 7←11 and 8→
12 is a dedicated line between the central station and the reception station, 7-11 is the microphone 5 wave modulated with the code ' demodulated by the reception system, and 8 → 12 is the code modulated by the central station to control the reception system. transmitted microwaves. 13 is a transmission system controller;
16 is a receiver system controller, 13 and 16 are 3 and 4, respectively.
Controlled by remote controller. 14 represents a transmitting system consisting of a transmitter and an antenna, and 15 represents a receiving system consisting of a receiver and an antenna. Further, B□ to destinations are mobile stations scattered at remote locations from the central station.

Now, FIG. 5, which shows the configuration of the transmitter/receiver of the mobile station, will be explained. In the figure, 51 is a terminal device, 52 is a modem,
53 is a transmitter/receiver and an antenna.

FIG. 3 is a block diagram of a configuration example of the remote controller shown in FIG.
Figure 4 shows the transmitting station and the receiving station ('- installed controller 1
3 or 16, both of which will be described in detail later. Further, FIG. 7 is a communication time chart between the central station and the mobile station. Note that the remote control device and the control device have the same configuration and functions, whether for transmission or reception.

Next, the overall operation of the apparatus of the present invention will be explained with reference to the time chart shown in FIG. In FIG. 7, ■ at the upper left corner indicates the time point at which polling-type digital communication between the fixed station and multiple mobile stations starts, and when the switch operation of the terminal device 1, etc.
) Start. 1) to 13) at the left end of FIG. 7 are time charts for each station associated with polling, and 2) shows that after the start, the fixed station terminal device 1 sends control codes B11 and C0 in the figure, as well as data D0. , these outputs are input to the input interface 1 of FIG. 31. This input 1 is the same as the input 3 (solid line) in FIG. B□ is a control code that calls mobile station B, and 2-1 (
n is 1, 2. It is composed of a known PN or M-sequence code with a period of . C0 is a control code indicating the end of data, and is composed of the same <PN or M sequence code.

The control/timing generator 1 in FIG. 35 constantly monitors the input interface 1 to the B□□
32 memory 1133 after determining the local call code of
The antenna switching unit 1 of the channel switching unit 1.34 is operated. It is assumed that the memory 1 of 32 stores in advance a program such as the operating frequency of the transmitting/receiving system, the antenna number to be used, the polling transmitting/receiving order, etc., as shown in FIG. 6, which is a meeting between the fixed station and each mobile station. It is assumed that the contents of the meeting can be overwritten at any time. The mobile station number (N.

), the second line shows the frequency for transmission and reception between the fixed station and the mobile station. For example, the operating frequency for digital communication for 82 stations is f2. The third line shows the number of the antenna to be connected to the transceiver on the fixed station side, and the fourth line shows the order of questions from the fixed station to the mobile station and responses from the mobile station.
The first one is Bo, the second one is B2, and so on.

Returning to FIG. 3, when the control/timing generator 1 of 35 determines the second B process as described above and operates the memory (32), the control/timing generator 1 of 35 operates the memory (32) according to the program of FIG. )
The operating frequency channel switching (control) signal N0 and antenna switching signal N2 according to the time chart are generated as digital signals from the channel switching unit 1 at 33 and the antenna switching unit 1 at 34 in FIG. After passing through a dedicated line modulator in the interface 1, the output is sent to the transmitting devices 5 and 8 to the transmitting station and the receiving station, respectively, and the control device 1
Send to 3 and 16. Do of normal question data (Figure 7 2)
Since it is necessary to switch the frequency channel and antenna of the transceiver at high speed according to the program before transmitting the
It is transmitted as a digital modulation signal of about ps. In this case, in the device shown in Fig. 3, the parts 31 to 34 and 36 are shown for either the transmitting station or the receiving station (35 is for both transmitting and receiving, and the terminal 1
(or it may be stored in the modem 2) Although the other is omitted, the transmitting station and receiving station operate separately, so
The program shown in FIG. 6 may be common to sending and receiving, or may be separate.

FIG. 4 shows one of the controllers provided separately at the transmitting and receiving stations, both of which have the same functions. The remote control signal from the central station arrives at the transmitting station and the receiving station at timings 9) and 10) in FIG. 7, respectively. This incoming signal is input to 41 at the left end of FIG. 4, ie, input interface 2, for each control device, and is converted into a digital code by a dedicated line demodulator therein. 46 is control/timing adjustment 2, which constantly monitors the input signal to 41, and when a signal arrives, makes a note for timing adjustment!
+2 (42) to store the control signal, from which the frequency channel switching signal and antenna switching signal are sent to the frequency channel switching unit 43 and antenna switching unit 44 for operation, and transmitted via the output interface 2 of 45 to the receiving station. Rapid switching drive of transmitter or receiver and antenna.

The explanation will be given by returning to FIG. 7 again. Figure 7 3), 4) 9)
, 10) When the preparation using the control signals of the transmitting system and the receiving system of each of the fixed station and the mobile station is completed according to the time chart 5), the fixed station transmits 8 to 2 interstitial data according to the time chart 5).

6) is a time chart for operating the transmitter, and when the transmitter on signal is output from the control/timing generator 35 in FIG.
), the transmitter is turned on by remote control operation. 6) Δt0 is a delay time that is the sum of the time it takes for the ON AIR signal to reach the transmitter and the rise time of the transmitter. Following the ON AIR signal of the transmitter, the control/timing generator 1 shown in FIG. 3 transmits through the 36 output interfaces 1→Z line with a delay of tl in the time chart shown in FIG. 7, so it is stored for timing adjustment. The control code that was being sent to the modulator/demodulator 2 in Figure 2 is sent to
The control code and data in 7) are transmitted from the transmission system using the dedicated transmission line from 2 to 6→10.

The transmission of 7) is received by mobile station B using the device shown in FIG. 5 as shown in the time chart of 11). A bit error occurred in the middle of Tazoshiko's wireless communication line, and Bo.

D,, O□□ are respectively B:, D,', O□'
, is assumed to be. On the receiving side, the hardware is configured so that errors below a certain value can be tolerated, and among the multiple mobile stations, only station B can receive subsequent data by relying on the 8 code at the receiving frequency of f. . This inquiry data is processed by the terminal device, for example, the CPU, of the mobile station B0, and 12 hours later, it is processed in the time chart of 12), 13).
= Therefore, start the transmitter and the rise time of the transmitter Δ
t, and later the control code and response data A1. .

D2. Send C2□. In 13), A11 is a control code for calling fixed station A from the mobile station, D2 is a response code, and C2□ is a control code indicating the end of response data.

The control code is composed of a PN or M sequence code.

8) is a time chart of response reception from the fixed station. As mentioned above, the system between the central station and the receiving station is also 3) 4), ' 9
), 10), the optimal frequency and receiving antenna have been switched in advance in the time chart, so high-quality data is input to the terminal device l in FIG. 2 and processed. Note that if a bit error occurs during the wireless line, A11. It changes as D2C2', but
Like the same device at the mobile station, the fixed station modulator/demodulator has a hardware configuration that can tolerate bit errors of a certain value or less, and when the A process is determined, the subsequent data D2 is output to the terminal device 1. . After t3 hours have elapsed, the fixed station again generates a control code B2□ from the terminal device 1 to call the next mobile station B2 according to the time chart in Figure 7 2), and then data D3,
Sends the termination control code C□, and executes 3) to 1 as described above.
Repeat the questions and answers according to the time chart in 3). In this way, a polling-type digital communication system can be configured by rapidly switching the preprogrammed transmission/reception operating frequencies (channels) and antennas for each mobile station.

The effects of the present invention are particularly effective when performing polling-type digital code transmission with multiple mobile stations such as fast-moving aircraft or ship stations located far away within a certain area.
It is possible to configure a high-quality line for each mobile station, and this can be achieved with a small number of transmitter/receiver equipment, and it is difficult to set up a good communication line for line quality that changes quickly over time. A huge improvement over what was there,
There are remarkable results, such as the ability to reduce the amount of equipment required due to the labor savings achieved through more efficient transmission power.

[Brief explanation of the drawing]

Figure 1 is a communication system diagram based on polling between a fixed station and multiple mobile stations implementing the present invention, Figure 2 is a block diagram of an example circuit configuration of the fixed station in Figure 1, and Figure 3 is the center of the fixed station. Figure 4 is a block diagram of an example circuit configuration of a remote controller at a station, Figure 4 is a block diagram of an example circuit configuration of each controller installed at a transmitting station and a receiving station, Figure 5 is a block diagram of an example circuit configuration of each mobile station in Figure 1. Figure 6 is a block diagram of an example circuit configuration, Figure 6 is an example of a program table showing the transmission, reception frequency, used antenna, and transmission/reception order between a fixed station and each mobile station, Figure 7 is a polling format between a fixed station and a mobile station. 2 is a time chart for communication. A: Fixed station, B□~Bn: Mobile station, 1.
...Terminal device, 2..Modulator/demodulator, 3..Remote controller for transmission, 4..Remote controller for reception, 5, 6.8.11..For dedicated line. Transmitting device, 7.9
．． 10.12...Receiving device for dedicated line, 13.16
...Controller, 14..Fixed station transmitter and antenna, 15..Fixed station receiver and antenna, 31.41..Interface, 32.42..Member. 33.43...Channel switching section, 34.44...Antenna switching section, 35.46...Control/timing generation section, 36.4
5...Output interface, 51...Terminal device, 52...Modulator/demodulator, 53...Transmission, receiver and antenna. Patent applicant: Kokusai Denki Co., Ltd. Agent: Daikyu 1 off-campus person 2nd Sen 3

Claims (1)

[Claims] When configuring a polling-type communication system from a fixed station to multiple mobile stations moving within a predicted area, the fixed station is connected to a central station and each remote station is located remotely from the central station and has a dedicated line. The central station consists of a transmitting station and a receiving station, which are each remotely controlled via a central station. The fixed station is equipped with a controller, a terminal device that controls the remote controller and transmits and receives data, and a modem. After switching the transmitting and receiving stations' transmitting and receiving frequencies and antennas using high-speed remote control according to the table of receiving frequencies, antenna numbers, and calling order, the calling code, subsequent interrogation data, and data end code are sent to the dedicated line. A polling communication method from a fixed station to a mobile station that automatically switches frequencies and antennas, characterized by transmitting from a transmitting station via a mobile station, and receiving a response from a corresponding mobile station via a receiving station and a dedicated line. .