JP2002315045A - Communication channel specification method - Google Patents

Abstract

(57) [Summary] Interference caused by adjacent communication channels (for example, when a wireless station 3 and a wireless station 4 are communicating with each other, the communication channel is between the calling wireless station 1 and the called wireless station 2) The present invention provides a communication channel designating method capable of eliminating interference caused by being adjacent to a communication channel during communication, and effectively using a plurality of communication channels. An electric field strength measurement unit and a control unit are provided for each radio station.
2, the electric field intensity of the control signal 5 transmitted by another wireless station is measured by the electric field intensity measuring unit 11, and the electric field intensity measured by the control unit 12 is equal to or more than a predetermined value and is not called from another wireless station. At this time, the control unit 12 specifies a communication channel different from and not adjacent to the communication channel superimposed on the control signal 5 as data, and further superimposes the specified communication channel as data on the control signal 7 and transmits the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication channel specification for a radio system having a plurality of radio stations and each radio station having a plurality of communication channels, and more particularly, to a communication channel for communication between radio stations. It is about designation.

[0002]

2. Description of the Related Art A communication channel designation method in a conventional radio system will be described. Each wireless station has a control channel and a plurality of communication channels, and is set to a control channel during standby (when not communicating). Then, at the time of calling, a control signal is transmitted to the partner station through a control channel. This control signal is for notifying a communication channel (for example, one channel) designated by the own station (hereinafter, referred to as a calling radio station) to a partner station (hereinafter, referred to as a called radio station). A communication channel designation signal (hereinafter, referred to as a control signal), which is also transmitted to radio stations other than the called radio station. After receiving the control signal, the called wireless station communicates with the calling wireless station on the specified communication channel. On the other hand, after receiving the control signal, the wireless stations other than the called wireless station store a communication channel used for communication between the calling wireless station and the called wireless station. At the time of calling, a control signal is transmitted by designating a communication channel other than the stored communication channel. For example, when the calling radio station and the called radio station are communicating on one channel and a radio station other than the called radio station calls, a channel other than the one channel (for example, 2
Channel) and transmit the control signal. as a result,
This prevents interference caused by the fact that the communication channel used when a wireless station other than the called wireless station makes a call and performs communication is the same as the communication channel used for communication between the calling wireless station and the called wireless station.

[0003]

In the conventional communication channel designating method, a communication channel used when a radio station other than the called radio station calls and communicates is used for communication between the calling radio station and the called radio station. Can be prevented from being the same as the communication channel used for the communication. However, interference occurs when the communication channel used by a wireless station other than the called wireless station for calling and communicating is a communication channel adjacent to the communication channel used for communication between the calling wireless station and the called wireless station. There is a disadvantage that it may be. For example, two communication channels are used when a wireless station other than the called wireless station calls and communicates,
When one communication channel is used for communication between the calling wireless station and the called wireless station, there is a disadvantage that interference may occur depending on the value of the center frequency and the bandwidth of each communication channel.

Accordingly, an object of the present invention is to provide a communication channel designating method capable of eliminating interference caused by adjacent communication channels by eliminating this drawback and effectively using a plurality of communication channels. And

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a measuring unit for measuring the electric field intensity of a received control signal, an electric field intensity measured by the measuring unit being not less than a predetermined value, and Each wireless station is provided with a control unit for designating a communication channel different from a communication channel superimposed as data on a control signal when the station is not called and not adjacent (discrete) at the time of calling. It was done. As a result, when the electric field strength of the received control signal is equal to or higher than a predetermined value and the own station is not called, the control unit determines that there is another calling wireless station in the communication area of the own station, and A communication channel different from and not adjacent to the communication channel superimposed as data can be designated. Therefore, it is possible to eliminate interference caused by adjacent communication channels.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a communication channel designation method for a wireless system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating the configuration of the wireless system according to the present embodiment. Each wireless station has a control channel C and a plurality of communication channels (N, where N ≧ 2), and is set to the control channel C during standby (when not communicating). At the time of calling, a control signal 5 is transmitted on the control channel C to the partner station. This control signal 5
Sets the communication channel S (where 1 ≦ S ≦ N) designated by the own station (hereinafter, referred to as the calling wireless station 1) to the other station (hereinafter, referred to as the calling station 1).
Called called radio station 2. ) Is a communication channel designation signal (hereinafter, referred to as a control signal 5) for notifying the user. When the calling wireless station 1 communicates with the called wireless station 2, the control signal 5 is transmitted to the called wireless station 2. For example, when the calling wireless station 1 specifies one channel, the communication channel S is one channel (S = 1). The called wireless station 2 that has received the control signal 5 transmits the calling wireless station 1 because the calling code superimposed on the control signal 5 matches the calling code of its own station.
, And shifts from the control channel C to the communication channel S specified by the calling wireless station 1. (Each wireless station has its own call code, and when calling, the call code of the partner station is superimposed on the control signal and transmitted.)
The calling wireless station 1 also shifts from the control channel C to the communication channel S specified by the own station. Then, the calling wireless station 1 and the called wireless station 2 communicate on the designated communication channel S. The communication signal 6 is a signal transmitted and received between the calling wireless station 1 and the called wireless station 2 when they are communicating with each other on the specified communication channel S. Since the control channel C is a wireless system common channel, the wireless stations 3 and 4 also receive the control signal 5. When the wireless station 3 and the wireless station 4 receive the control signal 5,
That is, the control signal 5 is transmitted to the receiving unit 10 via the transmission / reception switching unit 9.
, The control unit 12 determines whether or not the calling code superimposed on the control signal 5 matches the calling code of the own station. (The configuration of the calling radio station 1, the called radio station 2, and the radio station 4 is the same as the configuration of the radio station 3.) Since the calling radio station 1 is calling the called radio station 2, a control signal is generated. Since the calling code superimposed on 5 does not match the calling code of the wireless station 3 and the wireless station 4, it does not shift to the communication channel S. However, the communication channel S superimposed on the control signal 5
The control unit 12 stores the electric field intensity value measured by the electric field intensity measurement unit 11 in association with the electric field intensity value. When the radio station 3 calls and calls the radio station 4, when the calling radio station 1 exists in the communication area of the radio station 3 because the electric field strength value is equal to or more than the predetermined value, the radio station 3 is different from the communication channel S and adjacent to the communication channel S. The wireless station 3 specifies a communication channel P (P ≠ S and P ≠ S ± 1) not to be transmitted, and transmits the control signal 7. On the other hand, when the calling wireless station 1 does not exist in the communication area of the wireless station 3 because the electric field strength value is less than the predetermined value, the wireless station 3 specifies the communication channel P (P = S ± 1) adjacent to the communication channel S. Then, the control signal 7 is transmitted. The wireless station 4 that has received the control signal 7
Since the calling code superimposed on the communication station coincides with the calling code of the own station, it is recognized that the calling is being made by the wireless station 3, and the control channel C is shifted to the communication channel P designated by the wireless station 3. On the other hand, the wireless station 3 also shifts from the control channel C to the communication channel P designated by the own station. And the wireless station 3
The wireless station 4 communicates with the designated communication channel P. The communication signal 8 is a signal that is exchanged between the wireless station 3 and the wireless station 4 when the wireless station 3 is communicating on the designated communication channel P.

As described above, when the radio station 3 and the radio station 4 are communicating on the communication channel P and the calling radio station 1 and the called radio station 2 are communicating on the communication channel S, The communication channel P can be set so as not to be adjacent to the communication channel S even when the call radio station 1 is in the communication area of the radio station 3. Therefore, in the communication channel designation method of the wireless system according to the present embodiment, interference due to adjacent communication channels can be prevented.

In this embodiment, a radio system composed of four radio stations has been described, but the present invention is not limited to this. It is obvious that interference caused by adjacent communication channels can be similarly prevented in a wireless system including a plurality of wireless stations, not limited to four.

[0009]

According to the present invention, of a plurality of communication channels, a communication channel which affects a communication channel used by another radio station (a communication channel used by another radio device and a communication channel (A communication channel adjacent to the communication channel) is grasped by each wireless station, and a communication channel other than this communication channel is selected. As a result, it is possible to provide a communication channel designation method that can eliminate interference caused by adjacent communication channels and can effectively use a plurality of communication channels.

[Brief description of the drawings]

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

[Explanation of symbols]

 1: calling radio station 2: called radio station 3: radio station 4: radio station 5: control signal 6: communication signal 7: control signal 8: communication signal 9: transmission / reception switching section 10: reception section 11: electric field strength Measurement unit 12: Control unit 13: Transmission unit C: Control channel N: Number of communication channels S: Communication channel P: Communication channel

Claims (1)

[Claims] 1. A control system including a plurality of radio stations, the radio station having a control channel and a plurality of communication channels, wherein one communication channel designated by the radio station is superimposed as data on the control channel at the time of calling. A signal is transmitted to a counterpart station, and after a call is made, in a communication channel designating method of a radio system communicating with the counterpart station on the one communication channel, the electric field strength of the control signal received by each of the radio stations is A measurement unit to be measured, and a communication that is discrete with respect to a communication channel superimposed as data on the control signal when the electric field intensity measured by the measurement unit is equal to or more than a predetermined value and the own station is not called. A communication channel specification method comprising: a control unit that specifies a channel at the time of calling; and configured to eliminate interference caused by adjacent communication channels.