JP2723701B2 - Digital multi-way multiplex radio 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 digital multi-directional multiplex radio system, and more particularly to a method for setting a communication channel.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a communication channel arrangement of a conventional digital multi-directional multiplex radio system.
Indicates the arrangement of the communication channels of the master station, and (b) to (e) indicate the arrangement of the communication channels of the slave stations A to D.

In FIG. 1, reference numeral 1 denotes a frame synchronization signal for establishing synchronization between a master station and each slave station. Reference numeral 2 denotes a communication channel of the master station. In this case, one frame is divided into communication channels CH1 to CH12 by twelve time slots.

[0004] Reference numeral 3a denotes a fixed communication channel fixedly assigned to the slave station A, and 3b to 3d similarly denote slave stations B to
This is a fixed communication channel assigned to each of the slave stations D. In this case, three communication channels are assigned to each slave station as fixed communication channels.

Next, the operation will be described. When the slave station A communicates with the master station, three communication channels CH1 to CH3 of the fixed communication channel 3a assigned to the own station are used.
3 to select an empty one and start communication using the communication channel.

Here, even if a new communication request is generated when all the communication channels CH1 to CH3 of the fixed communication channel 3a assigned to the slave station A are already used for another communication, the slave station A Since A does not have a communication channel for setting up the communication, the communication request is rejected.

[0007]

Since the conventional digital multi-directional multiplex radio system is configured as described above, when all of the fixed communication channels 3a to 3d assigned to the own station are in use. When a communication request is issued, even if there is an available communication channel in the fixed communication channels 3a to 3d assigned to other slave stations, there is a problem that the communication request is rejected and communication cannot be performed. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a digital multi-directional multiplex radio capable of responding to a larger number of communication requests when there is a free communication channel. The aim is to get the system.

[0009]

Means for Solving the Problems] Digital multidirectional multiplex radio system according to the first aspect of the present invention, the call channel
And a certain time slot for each slave station.
Fixed communication channel between fixed
Separate settings for common communication channels that share inter-slots
As well as those fixed and common call channels.
Settings of the local station assigned to each slave station.
Parent using the at least one channel of the talk channel
The setting can be changed from the station and each slave station.

[0010]

According to the first aspect of the present invention, each of the slave stations secures the minimum necessary communication on the fixed communication channel and occurs when all the fixed communication channels allocated to the own station are occupied. By processing communication requests using a common communication channel, a digital multi-directional multiplex wireless system capable of responding to more communication requests is realized. In addition, fixed call channels and common
The talk channel changes its settings depending on the master station and each slave station.
Enables more flexible digital multi-way multi
Realize a heavy radio system. In addition, fixed call channels
Through which fixed and common call channels
By changing the settings of
A separate transmission path is used to control the
Digital multi-way multiplex radio system that does not need to be prepared
To achieve.

[0011]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1
A communication channel arrangement diagram showing an embodiment of the invention of this,
The figure (a) shows the arrangement of the communication channels of the master station.
(E) shows the arrangement of the communication channels of the slave stations A to D, respectively.

In the figure, 1 is a frame synchronization signal, 2 is a communication channel of a master station, and 3a to 3d are fixed communication channels assigned to respective slave stations. It is attached. In this case, each of the slave stations is assigned two communication channels as fixed communication channels 3a to 3d.

4a is a common communication channel in which the mobile station A is common to the other mobile stations B to D, and 4b to 4d are similarly
Each of the slave stations B to D is a common communication channel common to other slave stations. In this case, four communication channels CH9 to
CH12 is set as the common communication channels 4a to 4d.

Next, the operation will be described. When the slave station A communicates with the master station, first, two communication channels CH1 of the fixed communication channel 3a assigned to the own station are used.
~ To determine whether there is a vacancy in CH2,
If there is a space, the communication channel is selected and communication is started.

Further, all communication channels CH1 to CH2
If is already used for another communication, a vacant one is selected from the four communication channels CH9 to CH12 of the common communication channel 4a, and communication is started using that communication channel.

Therefore, the communication request generated in the slave station A is rejected only when all of the communication channels CH9 to CH12 of the common communication channel 4a are already used for another communication.

The same applies to the other slave stations B to D.

Embodiment 2 FIG. Figure 2 is a traffic channel arrangement view showing another embodiment of the invention of this, the arrangement of FIG. (B) is a speech channel of the master station, (b)
(E) show the arrangement of the communication channels of the slave stations A to D, respectively.

In this embodiment, four communication channels CH1 to CH4 are allocated as the fixed communication channels 3a of the slave station A, and two communication channels CH5 to CH10 are used as the fixed communication channels 3b to 3d of the slave stations BD. And the remaining communication channels CH11 to CH12
Are common communication channels 4b to 4d shared by slave stations B to D.

Such a communication channel arrangement is effective when applied to a system in which the slave station A must always deal with a large number of communication requests.

Embodiment 3 FIG. FIG. 3 is a diagram showing a communication channel arrangement according to another embodiment of the present invention. FIG.
(B) to (g) show the arrangement of the communication channels of the slave stations A to F, respectively.

In this embodiment, the communication channels CH1 to CH6 are allocated to the slave stations A to F one by one as fixed communication channels 3a to 3f, and the remaining communication channels CH7 to CH12 are shared by the slave stations A to F. Common communication channels 4a to 4f.

Such a communication channel arrangement is effective when applied to a system in which a large number of slave stations need to be accommodated in the master station because the number of communication channels exclusively used by the slave stations A to F is small.

Embodiment 4 FIG. In the above SL embodiment, once the arrangement of the set speech channel has been described for the case is fixed, the setting of the common traffic channel and a fixed speech channel to be assigned to each slave station can be set changes from the master station and the slave station You may do so.

For example, in the system in which the communication channels are initially arranged as shown in FIG. 1, when a disaster or the like occurs in the area under the control of the slave station A and the communication demand of the slave station A increases rapidly,
Then, control is performed between the mobile station and the master station to change the communication channel arrangement to that shown in FIG.

As a result, the slave station A can secure a large number of communication channels without being affected by communication requests of other slave stations, and can deal with a large number of communication requests from the affected area. .

Embodiment 5 FIG. In this embodiment , when the setting of the fixed communication channel and the common communication channel is changed by the master station and each slave station in the fourth embodiment, the control is performed by one of the fixed communication channels assigned to each slave station. This is performed using a channel.

More specifically, in the case of the slave station A, control is performed with the master station using one of the communication channels CH1 and CH2 assigned as the fixed communication channel 3a, for example, the communication channel CH1. , The number of the fixed communication channels 3a of the slave station A, and the use of the common communication channel 4a.

[0029]

As is evident from the foregoing description, according to the invention described in claim 1, there is an effect that the digital multi-directional multiplex radio system capable of corresponding to good Ri many communication request is obtained. Also, a more flexible digital multi-directional multiplex radio system
There is an effect that a time can be obtained. In addition, fixed call channels and
Separate transmission for control of common channel setting change
Digital multi-way multiplex radio system without the need for a route
There is an effect that a system can be obtained.

[Brief description of the drawings]

1 is a communication channel arrangement diagram showing a digital multidirectional multiplex radio system according to an embodiment of the invention of this.

FIG. 2 is a diagram showing a communication channel arrangement according to another embodiment of the present invention.

FIG. 3 is a diagram showing a communication channel arrangement according to another embodiment of the present invention.

FIG. 4 is a layout diagram of traffic channels showing a conventional digital multi-directional multiplex radio system.

[Explanation of symbols]

 3a-3f Fixed communication channel 4a-4f Common communication channel

Claims (1)

(57) [Claims] 1. A digital multi-directional multiplex radio system in which one frame is divided for each time slot to form a plurality of communication channels, and communication is performed between a master station and a slave station using the communication channels. The communication channel is divided into a fixed communication channel in which a predetermined time slot is fixedly assigned to each of the slave stations, and a common communication channel in which a time slot is shared between the slave stations .
And fixed and common communication channels
The settings for the fixed calls assigned to each
Utilizing at least one of the channels
A digital multi-directional multiplex radio system characterized in that settings can be changed from a master station and each slave station .