JP2823047B2 - Channel Assignment Method for Group Communication in Mobile Radio Communication 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 mobile radio communication system, and more particularly, to a channel allocation method for group communication.

[0002]

2. Description of the Related Art A conventional mobile communication system is described in the "Ministry of Construction Mobile Communication System (K-COSMOS) Standard Specification" No. 2
It is described in p.1 and p.22, 8-4-2 Broadcast Report (edited by the Telecommunications Office, Construction Economic Bureau, Ministry of Construction, issued by the Japan Construction Electrical Technology Association on August 1, 1994).

[0003] In a conventional channel allocation system for group communication in this type of system, when a group communication request is issued to any of the line control station devices C1 to Cn as shown in FIG. In Cn, a call is made to one of the communication-destination base station apparatuses B1 to Bn specified in the request, and if there is a vacant channel of the radio channel, the radio channel is specified for the group. When a plurality of mobile station devices A1 to An that have received it match the group number stored in the own device, the frequency is changed to the frequency designated by the wireless channel, and the group communication is performed.

When there is no available channel in the base station apparatus,
Although they belong to the group, they cannot participate in group communication. Also, even when an empty channel is created, there is no means to participate in group communication.

[0005]

A problem with the conventional system is that when group communication is requested to one of the line control station devices C1 to Cn in FIG. If there is no vacant channel in the wireless line of the base station device, the group communication cannot be performed in that zone even though there are mobile station devices belonging to the group in that zone.

[0006] Further, since there is no free channel in the base station apparatus, the channel is not allocated to group communication, and even if a free channel is created in a zone where group communication was not performed, the channel is not allocated to group communication. Therefore, there is a problem that even if the user belongs to the group, the user cannot participate in the group communication.

[0007] It is an object of the present invention to provide a system function that enables a base station apparatus to join a group communication as soon as a channel becomes available, because a mobile station apparatus that could not participate in group communication because there is no available channel. is there.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides one or more line control station devices, and one or more base station devices connected to the line control station device by wire or wirelessly. , And a plurality of mobile station devices connected to the base station device via radio, the line control station device in a mobile radio communication system that can be connected to the extension switching network,
The line control station device has an extension telephone, or a communication base station device number for each group for which a group communication request has been made from the mobile station device, and a management table corresponding to the channel use status in the base station device, The management table is created according to the order in which the group communication has occurred. In a zone in which there is no available channel and no channel can be allocated to the group communication, a signal indicating that the channel is available from the communication destination base station apparatus is provided as soon as the channel becomes available. Is transmitted to the line controller, and the line controller receiving the request inquires of the management table, allocates the vacant channel to the group communication, and cannot move to the group because there is no vacant channel and cannot join the group communication. A group in a mobile radio communication system that calls a station apparatus, allocates channels, and participates in group communication. The channel allocation method when-loop communication is adopted as a means.

[0009]

According to the present invention, by providing the above-mentioned management table, even if there is a mobile station device that cannot participate in group communication because there is no available channel in the base station device that has requested group communication, As soon as a vacant channel is created, the mobile station device can participate in group communication by making an inquiry to the management table.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an example of a mobile communication system to which the present invention is applied. This system includes one or a plurality of line control station devices C1 to Cn, and one or a plurality of base station devices B connected thereto by wire or wirelessly.
1 to Bn-n and a plurality of mobile station devices A1 to An connected thereto via radio.

The line control station devices C1 to Cn enter a group communication connection operation upon receiving a group communication request signal from the mobile station devices A1 to An or the extension telephones D1 to Dn. The operation at this time will be described with reference to FIG. 2 (here, a case where two communication destination base station apparatuses perform group communication for group A).

The A group communication request signal contains information such as the base station device number of the A group communication request destination and the group number A. The line control station device C1 that has received the A group communication request signal calls the requested communication base station device (B1, B2). The called base station apparatus B1 searches for a channel. As a result of the search, a channel is allocated to a mobile station device of group A in the zone of the base station device B1 because the channel is free. On the other hand, in the base station apparatus B2 that has received the call, as a result of the channel search, all the channels are in use, and it is assumed that the channel cannot be allocated to the A group communication. At this time, the base station apparatus B2 transmits a signal to the line control station apparatus C1 indicating that there is no available channel and the A group communication cannot be performed. Here, the line control station device C1 creates a group communication management table as shown in FIG. 3 of the present invention.

In the line control station device C1, which of the n base station devices under the control of the line control station device C1 is requested as a communication destination in a time series for each group communication number of the group communication request signal. Is left as data in the management table (B1 and B2 in the case of FIG. 2). Next, which base station apparatus has entered the group A communication among the communication destination base station apparatuses is left as data (in the case of FIG.
1). At the same time, the fact that there is no free channel is also written (the management table of the requested A group communication has been created). The management table is created in the order in which the group communication has occurred. When the base station device B2 sends a notification of the occurrence of an empty channel to the line control station device C1 while the A group communication is being performed, the line control station device C1 inquires the management table. It is determined whether a call is to be made for group communication (a state in which a plurality of group communication is occurring and a state in which there are a plurality of groups waiting for an available channel). Here, a call is made to the A group. Thereafter, a normal control procedure is performed to cause the mobile station devices belonging to the group A under the control of the base station device B2 to participate in the group A communication.

Even if there is a mobile station device that cannot participate in group communication because there is no free channel in the base station device, it is easy to follow complicated procedures by inquiring the management table as soon as a free channel is created. Can participate in group communication.

[0015]

As described above, according to the present invention, as the management table for each group communication in the line control station apparatus, 1: the number of the requested base station apparatus, 2: whether or not the group communication is being performed. 3: Is there an empty channel? With such simple data, it becomes possible to cause a mobile station device that has not been able to participate in group communication because there is no available channel to participate in the group communication. As a result, it becomes possible to notify the mobile station apparatus of important communications that require urgency without leaking.

[Brief description of the drawings]

FIG. 1 is a block diagram of an example of a mobile radio communication system to which the present invention is applied.

FIG. 2 is a sequence diagram of a connection control operation in one embodiment of the present invention.

FIG. 3 is a management table included in the line control station device according to the embodiment of the present invention.

[Explanation of symbols]

 A1 to An mobile station device B1 to Bn base station device C1 to Cn line control station device D1 to Dn extension telephone

Claims (3)

(57) [Claims] 1. One or a plurality of line control station apparatuses, one or a plurality of base station apparatuses connected to the line control station apparatus, and a plurality of mobile station apparatuses connected to the base station apparatus via radio. In the configured mobile radio communication system, the line control station device is made to correspond to the communication destination base station device number of each group for which a group communication request has been made from the mobile station device, and the channel use status in the base station device. In a zone in which a management table is provided and a channel is not allocated to a group communication because there is no available channel, a signal to the effect that a channel is available is transmitted from the communication destination base station apparatus to the line control station apparatus as soon as the channel is available. The line control station apparatus which has received the request makes an inquiry to the management table, allocates the vacant channel to the group communication, and participates in the group communication because there is no vacant channel. A channel assignment method for group communication in a mobile radio communication system, wherein a mobile station device that cannot be used is called, and a channel is assigned to participate in group communication. 2. The channel allocation method according to claim 1, wherein said line control station device can be connected to an extension switching network. 3. The management table according to claim 1, wherein the management table is created in the order in which the group communication has occurred.
A channel allocation method at the time of group communication in the mobile radio communication system described in the above.