JP2526498B2 - Radio frequency control system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio frequency control system, and more particularly to a radio frequency control system of a time division multi-directional multiplex communication system.

[0002]

2. Description of the Related Art Conventionally, in the time division multi-direction multiplex communication system,
The parent station or child station monitors the line quality of the operating radio frequency, and if the line quality deteriorates, communication is temporarily stopped because data transmission becomes difficult. . Therefore, since data transmission becomes impossible during this period, for example, as disclosed in JP-A-1-189245, a method has been proposed in which the bit rate of the line is reduced and the data transmission is continued when the line quality deteriorates. . However, this method reduces the data transmission rate, and is not preferable for the high-speed data transmission that has been recently demanded. Therefore, when the line quality is deteriorated, it is considered to change to another radio frequency with high quality.

[0003]

However, in this type of time division multi-directional multiplex communication system, in order to prevent the loss of data to be transmitted, it is necessary for the radio equipment of each of the master station and a large number of slave stations. It is necessary to change the radio frequency at the same time. However, in reality, since many slave stations are often installed in remote areas (positions apart by several tens of kilometers), in order to change the radio frequency between them at the same time, it is necessary for the master station and many slave stations to operate simultaneously. It is necessary to communicate with all of them and change the radio frequency at the same time, which requires a great deal of time and effort, and it is not always possible to perform the frequency change with high accuracy. There is a problem that the transmission data is lost in the slave station with the deviation. An object of the present invention is to provide a radio frequency control method capable of simultaneously changing radio frequencies between a master station and a large number of slave stations.

[0004]

According to a radio frequency control system of the present invention, a master station and a slave station which perform a time division multi-directional multiplex communication system are provided with frequency information of a radio frequency to be changed to an opposite station. A means for transmitting and a means for changing the radio frequency of the own station when the frequency information transmitted from the opposite station is detected are provided, and further, the parent station is provided with means for holding the frequency information for a predetermined time. The radio frequency of the local station is changed after a lapse of a predetermined time. Here, in the means for holding the frequency information, the master station transmits the frequency information to all the slave stations, and all the slave stations change the radio frequency.
The frequency information is held only for the time required for the frequency. For example, the master station detects the frequency information in the received data, the signal processing circuit that multiplexes the frequency information to be transmitted to the slave station with the transmission data, the wireless transmission / reception circuit that transmits / receives the data, and partially detects the frequency information. A frequency information detection circuit for sending to the signal processing circuit, a timer circuit for holding the detected frequency information for a predetermined time, and a frequency switching circuit for changing the radio frequency in the radio transmission / reception circuit of the own station based on the frequency information from the timer circuit. Equipped with. In addition, the slave station detects a signal processing circuit that multiplexes frequency information to be transmitted to the master station with transmission data, a wireless transmission / reception circuit that transmits / receives data, and a frequency information detection circuit that detects frequency information in received data. And a frequency switching circuit that changes a radio frequency in a radio transmission / reception circuit of its own station based on frequency information.

[0005]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a master station and one slave station according to the method of the present invention. First, the schematic configuration will be described. The master station 10 includes a wireless transmission / reception circuit 11 and a signal processing circuit 12. The transmission data is converted into a signal of a wireless frame by the signal processing circuit 12, and the wireless transmission / reception circuit 11 converts it into a wireless frequency. The converted data is transmitted via the transmission / reception antenna 13.
In addition, the slave station 20 includes a wireless transmission / reception circuit 21 and a signal processing circuit 2.
2, the transmitting / receiving antenna 23 receives a signal from the master station, and the wireless transmitting / receiving circuit 21 converts the signal into an intermediate frequency.
In addition, the signal processing circuit 22 converts the data signal to receive the data. On the contrary, in the data transmission from the slave station 20 to the master station 10, the signal processing circuit 22 and the wireless transceiver circuit 21 of the slave station 20 transmit the data from the transmission / reception antenna 23, and the transmission / reception antenna 13 of the master station receives the data. It is received as data via 11 and the signal processing circuit 12.

In addition to such a basic configuration, in the slave station 20, when the line quality of the current radio frequency is deteriorated by an instruction from a line monitoring circuit (not shown), the radio frequency is not deteriorated. The frequency information for changing to is output and multiplexed with the data signal to be transmitted. The slave station 20 has a master station 1 as described later.
Frequency information detection circuit 24 for detecting frequency information multiplexed in the data signal transmitted from 0, and frequency switching circuit 25 for changing (switching) the radio frequency in the radio transmitting / receiving circuit 21 when the frequency information is detected. Is provided.

On the other hand, the master station 10 detects the frequency information multiplexed in the data signal transmitted from the slave station 20, and transmits this frequency information to the signal processing circuit 12 to multiplex the data to be transmitted. Frequency information detection circuit 14
And a timer circuit 16 for holding the frequency information detected by the frequency information detection circuit 14 for a predetermined time, that is, the time until the frequency information is transmitted to a large number of slave stations as will be described later in detail. A frequency switching circuit 15 that changes the radio frequency in the radio transmission / reception circuit 11 based on frequency information held in the timer circuit 16 for a predetermined time is provided. Also in this master station 10, when the line quality of the current radio frequency is deteriorated by an instruction from the line monitoring circuit (not shown), frequency information for changing to the radio frequency in which the line quality is not deteriorated is output. And is multiplexed with the data signal to be transmitted.

The operation of changing the radio frequency by the master station and the slave station having the above configuration will be described. Note that FIG. 2 is a timing chart for explaining the operation, and here shows an example in which the current frequency f1 is changed to f2. A description will be given with reference to FIGS. 1 and 2. For example, when it becomes necessary to change the radio frequency by detecting the deterioration of the line quality in one slave station (A station) 20, the frequency information of the radio frequency to be changed is sent to the signal processing circuit 22, In the wireless transmission / reception circuit 21, the transmission data is transmitted at the current wireless frequency.

The master station 10 receives the signal from the slave station (station A), converts it to an intermediate frequency in the radio transmission / reception circuit 11, and then detects the frequency information contained in the received data in the frequency information detection circuit 14. Then, the detected frequency information is sent to the signal processing circuit 12, multiplexed with the transmission data, and transmitted through the wireless transmission circuit 11 to a large number of slave stations (A stations, B stations).
Station, C station, ..., N station). It goes without saying that this transmission is time division timing of each slave station (A station, B station, C station, ..., N station). Each slave station receives a signal from the master station at a time-divisional timing, and the frequency information detection circuit 24 detects the frequency information included in the reception data converted into the intermediate frequency by the wireless transmission / reception circuit 21. Then, based on the detected frequency information, the frequency switching circuit 25 immediately switches the radio frequency in the radio transmission / reception circuit 21 of its own station from f1 to f2.

On the other hand, in the master station 10, after the frequency information is detected by the frequency information detecting circuit 14, the frequency information is held in the timer circuit 16 for a predetermined time t0. Hold time t0 in the timer circuit 16
Is a number of slave stations (Station A, Station B, Station C,
, N stations), the frequency information from the parent station is transmitted to all of the slave stations (A station, B station, C station, ..., N station) to complete the change of the radio frequency. It's a good time.
When this time t0 elapses, the frequency information is output from the timer circuit 16, so that the frequency switching circuit 15 switches the radio frequency of the radio transmitting / receiving circuit 11 of the master station from f1 to f2 based on the frequency information.

As described above, the master station once receives the frequency information from one slave station, and transmits it to a large number of slave stations at the timing for communicating with each slave station. Since the change of the radio frequency is executed on the basis of each slave station, a large number of slave stations (A station, B station, C station, ..., N station)
Since the radio frequency is changed in synchronization with the communication with the master station, the transmission data transmitted and received between the two will never be lost. Also, all slave stations (A station, B station, C station,
, N stations), the radio frequency in the parent station is changed when the radio frequency is changed, so the radio frequency is unilaterally changed on the parent station side with respect to one child station, and communication is disabled. It will never happen. When the frequency information for changing the radio frequency is transmitted from the master station, the master station transmits the frequency information to each slave station and, at the same time, the frequency information detection circuit 14
Detects the frequency information and changes the frequency by the frequency switching circuit 15 via the timer circuit 16. Even in this case, needless to say, the frequency changing operation in each slave station is the same as that described above.

[0012]

The present invention described above, according to the present invention is, in the master station and the slave station, while sending the frequency information of the radio frequency to be changed with respect to the counter station, the frequency information transmitted from the opposite station Since the radio frequency of its own station is changed when it is detected, the radio frequency of the master station and the slave station can be wirelessly communicated. Therefore, even when a large number of slave stations are installed in a remote place, the radio frequency can be changed substantially simultaneously and easily.
In addition, the master station is configured to hold frequency information for a predetermined time, and then change the radio frequency of the own station after the predetermined time has elapsed. To transmit the frequency information, and all slave stations change the radio frequency.
Since the radio frequency of the master station is changed when the radio frequency of all the slave stations is changed by setting the time required for updating, the transmission data due to communication failure in all of the many slave stations No omissions will occur. Further, if the frequency information is transmitted from one slave station or from the master station, all the radio frequencies of the master station and a large number of slave stations can be changed, so that the change can be performed quickly and easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing configurations of a master station and a slave station according to an embodiment of the present invention.

FIG. 2 is a timing diagram for explaining a radio frequency changing operation.

[Explanation of symbols]

 10 master station 20 slave station 11,21 wireless transmission / reception circuit 12,22 signal processing circuit 13,23 transmission / reception antenna 14,24 frequency information detection circuit 15,25 frequency switching circuit 16 timer circuit

Claims (2)

(57) [Claims] 1. In a time division multi-directional multiplex communication system comprising a master station and a plurality of slave stations that wirelessly communicate with the master station, the master station and the slave stations have radio frequency frequencies to be changed. The parent station is provided with means for transmitting information to the opposite station and means for changing the radio frequency of the own station when the frequency information transmitted from the opposite station is detected, and the parent station holds the frequency information for a predetermined time. comprising means configured to change the radio frequency of own station after the lapse of the predetermined time, the circumferential
The means for holding the wave number information for a predetermined time is that the master station is all slave stations.
Frequency information to all the slave stations
Frequency information for the time required to change the wavenumber
The radio frequency control system according to claim 1, which holds. 2. A master station detects a frequency information in received data, a signal processing circuit that multiplexes frequency information to be transmitted to a slave station with transmission data, a radio transceiver circuit that transmits and receives data, and Frequency information detection circuit for transmitting the frequency information to the signal processing circuit, a timer circuit for holding the detected frequency information for a predetermined time, and a frequency for changing the radio frequency in the radio transmission / reception circuit of the own station based on the frequency information from the timer circuit. The slave station includes a switching circuit, a signal processing circuit that multiplexes frequency information to be transmitted to the master station with transmission data, a wireless transmission / reception circuit that transmits and receives data, and a frequency information detection circuit that detects frequency information in received data. And a frequency switching circuit that changes a radio frequency in a radio transmission / reception circuit of its own station based on the detected frequency information. Formula.