JPH1098532A - Group call service - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate previous registering without limiting a mobil equipment which can participate and to hold secrecy by forming a call channel(CH) by way of prescribed call receiving procedure and permitting the mobile equipment generating a group call request to overlap-connect the call of the mobile equipment of a call receiving destination to a call channel during speech. SOLUTION: A radio base station 20 recognizes the mobile equipment 13 of a call receiving destination from the received group call request and transmits an incoming signal to the mobile station of the call receiving destination with a control CH and the mobile equipment 12 which receives the incoming signal transmits the assignment request of a call CH3. The radio base station 20 reports the assignment of the call CH3 to the mobile equipment 13 with the control CH and establishes synchronization by prescribed procedure. Then, the mobile equipment 13 and the radio base station 20 execute prescribed call receiving procedure with the call CH3 where assignment is executed so as to establish synchronization, a mode change-over instruction is transmitted through the use of the same channel kind as that of the group calling request and an incidental control channel with the respective call CHs1-3 and a conference type group call is executed between the mobile equipments 11-13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a group call service in which a plurality of mobile stations form a group call communication channel via a radio base station, and in particular, can participate in a group call with a small change from the conventional system. Mobile devices are not limited in advance and pre-registration is unnecessary,
The present invention also relates to a group call service that can keep confidential.

[0002]

2. Description of the Related Art Conventionally, in this type of group call service, as shown in FIG.
01 to 104 are connected to the control device 300 via base devices 201 to 204, which are a plurality of base stations that perform wireless communication, and the control device 300 controls so as to connect and form a conference telephone for each group.

[0003] A system in which a conference call can be made using a plurality of portable telephones at the same time only in a group registered in advance with this group call service is described in, for example, Japanese Patent Laid-Open No. Hei 6-224833.

Referring to FIG. 5, this system will be described. A plurality of portable telephones 101 to 102 and a plurality of portable telephones 103 to 104 constitute a group to which each belongs. A group identification signal (group ID) for identifying is transmitted. The control device 300 is configured such that the base devices 201 to 202 and the base devices 203 to 204 are connected by the communication lines 301 and 302, respectively, corresponding to the group identification signal, so that the communication can be performed by the conference communication method. .

More specifically, control device 300 determines whether or not the received group identification signal belongs to the same group, and connects to the same communication line only within the same group so that a plurality of mobile telephones can simultaneously make a conference call. I have to.

Further, in this system, it is described that a transmitted group identification signal (group ID) is newly added to a conventional preamble, system ID and control command as shown in FIG. In the frame format according to this description, for example, RCR (Resear
It can be interpreted that a group identification signal (group ID) is added to a specified area on the control channel based on the standard of the ch & Deveropment Center for Radio System.

[0007]

In the above-mentioned conventional group call service, the connection from the mobile phone as a mobile unit to the conference call line is designated by a group identification signal for identifying a group registered in the control device in advance. Then, a request is made to the control device by the frame format on the control channel.

[0008] For this reason, it is necessary to notify the group identification signal to the participants in advance, and to additionally participate, it is necessary to notify the group identification signal again, and it is not possible to freely join the conference partner as necessary. There is a problem.

[0009] Further, in this configuration, basically, the caller can freely participate in the conference by designating a group identification signal for identifying the group. Is difficult to keep secret.

According to the description, a group identification signal (group ID) area is additionally provided in a conventional frame format using a control channel.
Traditional hardware, software, protocols, etc.
There is a problem in the feasibility that the system needs to be changed in a wide range.

SUMMARY OF THE INVENTION An object of the present invention is to provide a group call service in which a mobile station that can participate in a group call can be preliminarily limited, pre-registration is unnecessary, and confidentiality can be maintained with a small change of the conventional system. It is.

[0012]

According to the present invention, there is provided a group call service in which a plurality of mobile stations form a group call communication channel via a radio base station. When a predetermined group call request is provided in the format, and the radio base station receives the group call request from the talking mobile station via the talking communication channel, the wireless base station receives the group calling request included in the group calling request. An incoming signal is transmitted from the called number to the called mobile station, a call channel is formed through a predetermined calling procedure, and the mobile station that has issued the group call request moves the called party to the talking channel during the call. The mobile device is provided with connection means for redundantly connecting the communication channels of the mobile device, and when issuing a predetermined group call request, the mobile device has a channel of a frame format. Control means for inserting a predetermined code into a type and inserting a callee number in a predetermined area and transmitting the same to the radio base station and receiving a mode switching instruction from the radio base station to multiplex a communication channel. ing.

[0013] As described above, the group call request to be transferred and the mode switching to the group call are switched by the associated control channel (S) on the frame format on the call channel.
ACCH or FACCH), and only a few messages are added as an option of the call control processing on the protocol.

Further, since a group call request is issued from a mobile station during a conference call to connect and join an additional mobile station, a conference participant can be freely selected by a conference member's will and limited to participants. It has a confidentiality protection function and a security function because other people cannot freely participate in the interruption without receiving it. Furthermore, the call is the other party's telephone number, and no special registration number is required.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a main sequence chart corresponding to blocks showing an embodiment of the present invention, and FIG. 2 is a diagram showing an embodiment from a normal call to a busy state in the first step S1 of FIG. FIG.

In this description, as in PHS (Personal Handy Phone System), SCR according to the RCR standard is used.
It is assumed that TD (Standard) -28 is adopted.
FIG. 3 shows an outline of a communication frame format (physical slot configuration) on a communication channel in this standard.

First, referring to FIG. 2, first step S in FIG.
A procedure similar to that of the related art until the state 1 is in a talking state will be described. As shown in the figure, it is assumed that the mobile stations 11 and 12 can communicate with the radio base station 20.

The mobile station 11 sends a call channel (hereinafter, call CH) allocation request to the radio base station 20 via a control channel (hereinafter, control CH) common to all the mobile stations by calling operation (procedure). S21).

The radio base station 20 receives this request, and
It is assumed that 1 has been assigned. As a result, the radio base station 20 notifies the mobile station 11 of the assignment of the communication CH1 via the control CH (procedure S22), and establishes synchronization by a predetermined procedure (procedure S23). Subsequent information between the mobile station 11 and the radio base station 20 is transmitted on this call CH1 using a predetermined communication frame format.

Next, the mobile station 11 and the radio base station 20
Performs a predetermined calling procedure via the communication channel CH1 to which is allocated and synchronization is established, and as a result, the radio base station 20 knows the called mobile station 12 (procedure S24).

Accordingly, the radio base station 20 sends an incoming signal to the called mobile station 12 via the control CH (step S25).
Is transmitted (step S26).

The radio base station 20 having received the call channel assignment request assumes that the call channel CH2 has been assigned, notifies the mobile station 12 of the assignment of the call channel CH2 via the control CH (step S27), and performs a predetermined procedure. Establish synchronization (procedure S2
8). Subsequent information between the mobile station 12 and the radio base station 20 is transmitted on this call CH2 using a predetermined communication frame format.

Next, the mobile station 12 and the radio base station 20
Performs a predetermined incoming call procedure through the allocated and synchronized communication channel CH2 (procedure S29), so that the radio base station 20 transmits the communication channel CH2 with the called mobile device 12 to the mobile device 11
Mobile terminals 11 and 12 by connecting to
A call between them becomes possible (step S30), and a talking state is established.

The predetermined communication frame format on the communication channel used here employs means for transmitting control information by inserting control information between voice information. As shown in FIG. The information area sandwiched between a synchronization pattern by a plurality of fields for obtaining the data and a CRC (Cyclic Redundancy Check: redundant bit for error correction) includes a CH type (channel type) and a SACCH (Slow Additional Cont).
rol Channel: low-speed associated control channel), and TCH
(Traffic Channel: voice information channel) or FAC
A CH (Fast Additional Control Channel) is arranged and configured.

Next, a procedure for joining the mobile station 13 as a group call will be described with reference to FIG.

As shown, mobile units 11, 12, 13
Can communicate wirelessly with the wireless base station 20, and as described above with reference to FIG.
In a state where a call is in progress (procedure S1) by the radio base station 20 via CH1 and CH2, the mobile station 12 requests a call for a group call by a predetermined operation including the telephone number of the mobile station 13.

The mobile station 12 sends a call request for a group call to the CH type and FACCH shown in FIG.
The code of the newly defined group call request and the information necessary for connection are inserted into each area and transmitted to the communication channel CH2 (procedure S2).

Since the radio base station 20 knows the called mobile station 13 from the received group call request, it sends an incoming signal to the called mobile station 13 via the control CH (step S).
3), the mobile station 12 that has received the incoming signal transmits a call channel assignment request (step S4).

It is assumed that the radio base station 20 that has received the call channel assignment request has assigned the call channel CH3. Wireless base station 2
0 designates the allocation of the communication CH3 to the mobile station 13 via the control CH.
(Step S5), and establishes synchronization by a predetermined procedure (Step S6). Subsequent information between the mobile station 13 and the radio base station 20 is transmitted on the communication channel CH3 using a predetermined communication frame format.

Next, the mobile station 13 and the radio base station 20
Performs a predetermined incoming call procedure through the allocated and synchronized communication channel CH3 (procedure S7), and then performs the radio base station 2
0 transmits a mode switching instruction via each of the communication channels CH1, CH2, and CH3 using the channel type and the associated control channel in the same manner as the group call request (step S8). Performs a conference-style group call (step S9).

Further, when another mobile station is added to the group call, one mobile station during the call can participate by merely sending the group call request in the step S2.

In the above description, the format and procedure of the standard based on the STD of the RCR have been illustrated and described.
In other standards or standards, if a group call request and mode switching instruction can be added in the standard or standard,
The present invention can be applied.

Further, in the above description, the group call is illustrated and described for a mobile station connected to only one radio base station. On the other hand, a call path formed via another radio base station is overlapped and connected to a group call channel by one radio base station, so that a group call between mobile stations over a plurality of radio base stations can be established. realizable.

[0035]

As described above, according to the present invention, a predetermined group call request is provided in a frame format to be transferred on a communication channel, and a radio base station can transmit a call from a mobile station on a call to a communication channel on a call. When a group call request is received through the group call request, an incoming signal is sent from the called number included in the group call request to the called mobile station, and a call channel is formed through a predetermined call procedure to form a group. A group call service is provided that includes a connection unit that connects the call channel of the called mobile station to the call channel of the call destination mobile station while the mobile station that has issued the call request is busy.

According to this configuration, a group call request for adding a mobile station to a group call can use a conventional standard or standard. Therefore, the frame format to be transmitted is unchanged from the current state, and the content to be added to the frame format is not changed. An effect can be obtained that can be dealt with only by the software change accompanying the change of the software. In addition, when the user wants to participate in the group call, the connection can be established only by inputting the telephone number of the mobile device. Therefore, the members to participate can be arbitrarily selected, and the prior registration can be eliminated.

Furthermore, since only the mobile unit specifies and calls the additional mobile unit during the group call, interruption by a third party is not possible, and a great effect can be obtained in terms of confidentiality and security.

[Brief description of the drawings]

FIG. 1 is a sequence chart corresponding to an apparatus block showing an embodiment of the present invention.

FIG. 2 is a sequence chart corresponding to an apparatus block showing a procedure leading to FIG. 1;

FIG. 3 is a pattern configuration diagram showing one configuration of a frame pattern on a communication channel.

FIG. 4 is a pattern configuration diagram showing one configuration of a frame pattern on a control channel.

FIG. 5 is a device block diagram showing an example of the related art.

[Explanation of symbols]

 11, 12, 13 Mobile device 20 Radio base station

Claims (4)

[Claims] In a group call service in which a plurality of mobile stations form a group call communication channel via a radio base station, a predetermined group call request is provided in a frame format to be transferred on the call channel, When the wireless base station receives the group call request from the talking mobile device via the talking communication channel, the wireless base station receives a call from the called number included in the group calling request to the called mobile device. The mobile unit which transmits a signal, forms a communication channel through a predetermined call reception procedure, and issues the group call request, and has a connection means for overlappingly connecting the communication channel of the called mobile device to the communication channel in communication. A group call service, characterized in that: 2. The mobile device according to claim 1, wherein the mobile station inserts a predetermined code into a channel type of a frame format and a destination number in a predetermined area when issuing a predetermined group call request. A group communication service, comprising: a control unit for transmitting to the radio base station and multiplexing a communication channel in response to a mode switching instruction from the radio base station. 3. The group call request according to claim 1, wherein the group call request is a region that substitutes for voice in a predetermined information region, designates a channel type as a channel type region, and calls a high-speed associated control channel. A group call service formed by inserting call request information including a destination number. 4. The group call request according to claim 1, wherein the group call request includes a destination number in a low-speed associated control channel of a plurality of frames in which a predetermined channel type is specified in a channel type area. A group call service formed by inserting information.