JPH11340994A - Wireless communication system - Google Patents

Abstract

(57) [Summary] The present invention relates to a wireless communication system in which a master station and a plurality of slave stations communicate with each other by specific low power radio, and performs a polling operation between the master station and a plurality of slave stations. If the call from the slave station is freely acknowledged while the call is being answered, the conventional problem that the response of the slave station in the polling operation and the call from another slave station collide and the polling operation is prevented is solved. It is an object of the present invention to provide a wireless communication system capable of making a call from a slave station freely without interruption. A polling operation is performed between a master station and a plurality of slave stations by performing communication using a data channel during normal communication and performing communication using a control channel when calling from a slave station. Also, it is possible to freely make a call from the slave station without interrupting the polling operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system for data transmission and the like communicating with specified low power radio.

[0002]

2. Description of the Related Art Conventionally, the configuration of a transceiver for communicating with a specified low power radio is generally known as shown in FIG.
In the figure, 1 is a master station, 2 is a slave station, 3 is a transmitting / receiving antenna, 4 is a duplexer for realizing a transmitting / receiving operation by duplex, 5 is an antenna 3 and a duplexer 4
A transmission means for transmitting a transmission signal via the antenna 3, a reception means for obtaining a reception signal via the antenna 3 and the duplexer 4, a communication channel setting means 7 for setting a communication frequency for each of transmission and reception, 8 Is a control means for controlling the transmission / reception operation, and the master station 1 and the slave station 2 have the same configuration. Then, a communication connection operation is first performed between the master station 1 and the plurality of slave stations 2 using the control channel, and thereafter, communication is performed using the data channel.

[0003]

However, in the wireless communication system having the conventional configuration, the master station 1 and the plurality of slave stations 2
If a call from each of the slave stations 2 is freely acknowledged during the polling operation, the response of the slave station 2 in the polling operation collides with a call from another slave station 2 and the polling operation is stopped. Had the problem of hindering it.

To cope with this, a time slot is provided in the polling operation, and only the
In order to prevent a collision between a response from the slave station 2 and a call from another slave station 2 in a polling operation by permitting a call from the slave station 2, a polling operation has been proposed. There is a problem that the operation cycle is increased and the calls from the slave stations 2 are concentrated at one time, so that the collision between the calls from the slave stations 2 is liable to occur.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and enables a mobile station to freely make a call from a mobile station without disturbing a polling operation between the mobile station and a plurality of mobile stations. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, a radio communication system according to the present invention comprises a master station and a plurality of slave stations, and the master station realizes a transmitting / receiving antenna and a duplex transmitting / receiving operation. Duplexer, transmitting means for transmitting a transmission signal via the antenna and the duplexer, receiving means for obtaining a reception signal via the antenna and the duplexer, and communication for setting respective communication frequencies for transmission and reception In this configuration, a plurality of channel setting means are provided, and the transmission / reception operation is controlled using the control means. Further, the slave station obtains a reception signal via the antenna and the duplexer, a duplexer for realizing a transmission / reception operation by duplex, a transmission means for transmitting a transmission signal via the antenna and the duplexer, and a reception signal via the antenna and the duplexer. Receiving means, a communication channel setting means for setting respective communication frequencies for transmission and reception, and a control means for controlling transmission / reception operations.

According to the configuration of the present invention, it is possible to freely make a call from a slave station without hindering the polling operation even during the polling operation between the master station and a plurality of slave stations. A wireless communication system that can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a master station and a plurality of slave stations, communicates using a data channel during normal communication, and controls when calling from the slave station. By using channels to communicate, it is possible to freely make calls from slave stations without interfering with the polling operation while performing polling operations between the master station and multiple slave stations. Has an action.

According to a second aspect of the present invention, in the first aspect of the present invention, an antenna for both transmitting and receiving is provided to the master station, a duplexer for realizing a transmitting and receiving operation by duplexing, and the antenna and the duplexer. A transmission unit for transmitting a transmission signal, a reception unit for obtaining a reception signal via the antenna and the duplexer, and a plurality of communication channel setting units for setting communication frequencies for transmission and reception are provided. Polling between the master station and a plurality of slave stations with a simple configuration by dedicating one of the antennas, the duplexer, the transmission means, the reception means, and the communication channel setting means to calling from the slave station. During operation, it is possible to handle free calls from slave stations without interrupting the polling operation. It has the effect of that.

According to a third aspect of the present invention, in the first aspect of the present invention, a transmission / reception antenna for a slave station, a duplexer for realizing a transmission / reception operation by duplexing, and the antenna and the duplexer are provided. Transmission means for transmitting a transmission signal, reception means for obtaining a reception signal via the antenna and the duplexer, communication channel setting means for setting communication frequencies for transmission and reception, and control of transmission / reception operations The communication system uses a data channel during normal communication, and switches to the control channel when a call request is issued from a slave station. During a polling operation between slave stations, a call can be freely made from a slave station without interfering with the polling operation. It has the effect that the door can be.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a wireless communication system according to an embodiment of the present invention, and FIG. 2 is a timing chart illustrating an operation of the wireless communication system according to the embodiment.

In FIG. 1, reference numeral 1 denotes a master station, 2 denotes a slave station, 3 denotes an antenna for both transmission and reception, 4 denotes a duplexer for realizing a transmission / reception operation by duplex, and 5 denotes a transmission signal via the antenna 3 and the duplexer 4. Transmission means for
6 is a receiving means for obtaining a received signal via the antenna 3 and the duplexer 4, 7 is a communication channel setting means for setting communication frequencies for transmission and reception, and 8 is a control means for controlling transmission and reception operations. The station 1 is configured to have two slave stations.

The operation of this embodiment will be described below with reference to FIGS. Here, for the sake of simplicity, the following description will be made assuming that communication is performed between one master station 1 and two slave stations A and B.

The master station 1 first sets the communication channels of the two transmitting means 5 and the receiving means 6 as control channels by the communication channel setting means 7. Then, after transmitting a connection request to the child station A and the child station B using one of the control channels, the communication channel
Then, the communication channel of the receiving means 6 is switched to the data channel. Thus, the master station 1 handles a call from the slave station 2 on the control channel, and performs a normal communication operation such as a polling operation on the data channel in parallel.

The slave stations A and B first set the communication channels of the transmitting means 5 and the receiving means 6 as control channels by the communication channel setting means 7 and receive a connection request from the master station 1 and then set the communication channel. Transmission means 5 by means 7
Then, the communication channel of the receiving means 6 is switched to the data channel, and normal communication operation such as polling operation with the master station 1 is performed. When the control means 8 needs a call request from the slave station B, the communication channel setting means 7 switches the communication channels of the transmission means 5 and the reception means 6 to control channels, performs a call operation, and performs a call operation from the master station. Wait for a response.

The master station 1 sends an Ack response when a call from the slave station B is properly received on the control channel, and normalizes the call from the slave station B due to a collision of the calls from the slave station B. If it cannot be received, it does not respond.

If the slave station B can receive the Ack response from the master station within a certain time after the calling operation from the slave station B, the communication channel setting means 7 sets the transmitting means 5 and the receiving means 6
Is switched to the data channel, and the operation returns to the normal communication operation. If the Ack response from the master station 1 cannot be received within a certain time after the calling operation from the slave station B, the call from the slave station B is retransmitted after a further elapse of a random time.

As described above, in the present embodiment, the master station 1 handles a call from the slave station 2 on the control channel, and at the same time performs a normal communication operation such as a polling operation on the data channel. By switching from the data channel to the control channel when making a call request from the slave station 2 and making a call, the polling operation can be performed even during the polling operation between the master station 1 and the plurality of slave stations 2. The effect of being able to freely make a call from the slave station 2 without hindrance is obtained, and since the calls from the slave station 2 do not concentrate at one time, a collision between the calls from the slave station 2 occurs. The effect of being difficult is obtained. In addition, even when a collision occurs, the effect of being able to notify the parent station 1 by retransmission after the elapse of the random time is obtained.

[0019]

As described above, the radio communication system according to the present invention is composed of a master station and a plurality of slave stations. When communication is performed between the master station and the slave stations, a data channel is used during normal communication. When a call is made from a slave station, communication is performed using the control channel, so that the slave station can freely perform a polling operation between the master station and a plurality of slave stations without interfering with the polling operation. This makes it possible to obtain an effect that a call can be made.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.

FIG. 2 is a timing chart showing an operation of the wireless communication system in the embodiment.

FIG. 3 is a block diagram showing a configuration of a conventional wireless communication system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 master station 2 slave station 3 antenna 4 duplexer 5 transmitting means 6 receiving means 7 communication channel setting means 8 control means

Claims (3)

[Claims] 1. A wireless communication system comprising a master station and a plurality of slave stations, wherein the master station and the slave station communicate with each other by specific low-power radio, and communicates using a data channel during normal communication. And a communication system using a control channel at the time of calling from a slave station. 2. A transmission / reception antenna in a configuration of a master station.
A duplexer for realizing a transmission / reception operation by duplexing, a transmission unit for transmitting a transmission signal via the antenna and the duplexer, a reception unit for obtaining a reception signal via the antenna and the duplexer, and transmission and reception, respectively. A plurality of communication channel setting means for setting a communication frequency of one of said plurality of communication channels, and one of said antennas, a duplexer, a transmitting means, a receiving means and a communication channel setting means is dedicated to calling from a slave station. 2. The wireless communication system according to 1. 3. An antenna for both transmission and reception in a configuration of a slave station,
A duplexer for realizing a transmission / reception operation by duplexing, a transmission unit for transmitting a transmission signal via the antenna and the duplexer, a reception unit for obtaining a reception signal via the antenna and the duplexer, and transmission and reception, respectively. Communication channel setting means for setting the communication frequency of, and control means for controlling the transmission and reception operation, during normal communication to communicate using a data channel,
2. The wireless communication system according to claim 1, wherein a call is switched to a control channel when a call request is issued from a slave station.