Mobile station

The present invention relates to a mobile station capable of participating in a group call in which call data is transmitted and received within a group including a plurality of mobile stations and the transmission right, which is the authority to transmit the call data, is assigned to the mobile stations included in the group.

Conventionally, a group call (for example, PTT; Push-To-Talk) in which call data such as a voice signal is transmitted and received within a group including a plurality of mobile stations is generally widely known.

In such a group call, the authority to transmit call data such as a voice signal (hereinafter referred to as the transmission right) is assigned to one mobile station included in the group, and the other mobile stations included in the group have the transmission right. Receives call data transmitted by one mobile station.

From the viewpoint of giving the users sufficient time to transmit the call data and equally distributing the opportunity to transmit the call data to each user, the transmission right is enabled in the above-mentioned group call. The time limit is limited to the speech time limit (for example, 30 seconds).

Further, the communication system in which the group call is performed is configured by, for example, a packet switching NW (network) using SIP (Session Initiation Protocol), and is managed by the group call server (for example, Non-Patent Document 1).<nplcit num="1"><text>SIP: Session Initiation Protocol, RFC3261</text></nplcit>

<p> However, when a mobile station (user) tries to leave a group call, when he / she wants to send a statement (message) to another mobile station included in the group, such as leaving the group call, The user must wait until the transmission right is assigned to his / her station.</p><p> Specifically, the user must wait until the speech time limit elapses for the transmission right assigned to another user. In addition, the user must wait further if the transmission right is assigned to another user even after the speech time limit has elapsed.</p><p> On the other hand, when a user gets on a train or starts a meeting while making a group call, the mobile station (user) wants to leave the group call immediately. In such a case, it is necessary to wait until the transmission right is assigned to the own station, which reduces the convenience of the user.</p><p> Therefore, the present invention has been made to solve the above-mentioned problems, and makes it easy to convey a message such as withdrawal from a group call and makes it possible to improve user convenience. The purpose is to provide a mobile station.</p>

<p> One feature of the present invention is a microphone (microphone) when a mobile station (mobile station 10) capable of participating in a group call is not assigned a transmission right which is an authority to transmit call data for the group call. A storage unit (memory 19) that stores the sound picked up by 14a) as a recorded message, and a transmission unit (control unit 20, that transmits the transmission right allocation request after the display of the group call application is finished. The baseband processing unit 17, RF / IF converter 12, power amplifier 13, antenna 11, etc.) are provided, and when the transmission unit is assigned the transmission right in response to the transmission right allocation request, the transmission right is said to be the same. The gist is to transmit the recorded message stored in the storage unit for the group call.</p><p> According to such a feature, the storage unit stores the sound picked up by the microphone as a recorded message when the transmission right is not assigned, and the transmission unit acquires the transmission right after the display of the application is finished. Sends the recorded message stored in the storage unit to the group call. That is, the mobile station sends a recorded message to the group call in the background without any user intervention, while making the user appear to have finished the application.</p><p> Therefore, it is possible to facilitate the transmission of a message such as leaving the group call and improve the convenience of the user.</p><p> One feature of the present invention is that, in the above-described features of the present invention, even if the transmitting unit is in the process of storing the recorded message in the storage unit, the data already stored in the storage unit is in order. The gist is to send the recorded message.</p><p> One feature of the present invention is that, in the above-described features of the present invention, the mobile station further includes a reproduction unit (reproduction processing unit 25) that decodes the recorded message encoded and stored in the storage unit, and the transmission unit. However, the gist is to transmit the recorded message decoded by the playback unit.</p>

<p> According to the present invention, it is possible to provide a mobile station that makes it easy to convey a message such as leaving a group call and improves the convenience of a user.</p>

[One Embodiment]

(Structure of Communication System) Hereinafter, a communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment of the present invention.

As shown in FIG. 1, the communication system is connected to the circuit-switched NW300 including the base station 30, the packet-switched NW400 including the base station 40, the SMS server 100 connected to the circuit-switched NW300, and the packet-switched NW400. It has a group call server 200. The SMS server 100 and the group call server 200 are connected.

In one embodiment, the base station 30 and the base station 40 are described as separate base stations, but the present invention is not limited to this. Specifically, one base station included in both the circuit-switched NW300 and the packet-switched NW400 may also have the functions of the base station 30 and the base station 40.

The plurality of mobile stations 10 (mobile stations 10a to 10d) are mobile phone terminals that can be connected to a communication system. Specifically, each mobile station 10 can be connected to the base station 30 included in the circuit-switched NW300 and the base station 40 included in the packet-switched NW400.

The circuit-switched NW300 is a network in which communication is performed by circuit switching (for example, a 1x network used in cdma2000), and is a network in which the address registration of the mobile station 10 is not required when the mobile station 10 communicates. On the other hand, the packet switching NW400 is a network in which communication is performed by packet switching (for example, an EV-DO (Evolution Data Optimized) network used in cdma2000), and when the mobile station 10 communicates, the address of the mobile station 10 is registered. Is a required network.

Further, in packet switching NW400, among the other mobile station 10 (designated mobile station) designated by one mobile station 10 (transmitting mobile station) and one mobile station 10 (transmitting mobile station), the transmitting side A group call is started by the mobile station 10 that answers the call from the mobile station.

In the following, the group including the calling side mobile station and the designated mobile station will be referred to as an initial group, and will be described assuming that the transmitting side mobile station is the mobile station 10a and the designated mobile station is the mobile station 10b to the mobile station 10d. To do.

Further, in the group call according to one embodiment, the mobile station 10 participating in the group call does not participate in the group call in order to allow the mobile station 10 not participating in the group call to participate in the group call. It is possible to call station 10.

Here, the group call includes PTT (Push-To-Talk) that transmits / receives only an audio signal as call data and an IP-TV that transmits / receives an audio signal and a video signal as call data. Further, in a group call, a transmission right (speaking right), which is a right to transmit call data, is assigned to any of the mobile stations 10 participating in the group call.

As described above, the SMS server 100 is connected to the circuit-switched NW300, and sends an SMS (registration request) requesting address registration to the group call server 200 to the designated mobile station.

The group call server 200 is a server that manages group calls. Specifically, when the group call server 200 receives an INVITE (new) requesting the start of a group call from the calling mobile station, the group call server 200 sends an SMS (transmission request) requesting the transmission of an SMS (registration request) to the SMS server 100. Send to. Subsequently, the group call server 200 transmits INVITE (new) to the designated mobile station whose address is registered in the group call server 200. In addition, the group call server 200 starts a group call in which call data is transmitted / received between the designated mobile station that responds to INVITE (new) and the calling mobile station. The details of the group call server 200 will be described later (see FIG. 4).

(Structure of Mobile Station) Hereinafter, the configuration of the mobile station according to the embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a diagram showing a configuration of a mobile station 10 according to an embodiment of the present invention. Since the mobile station 10a to the mobile station 10d have the same configuration, they will be collectively referred to as the mobile station 10 in the following description.

As shown in FIG. 2, the mobile station 10 includes an antenna 11, an RF / IF converter 12, a power amplifier 13, an audio input / output unit 14, a video input / output unit 15, a codec processing unit 16, and a base. It has a band processing unit 17, an operation unit 18, a memory 19, and a control unit 20.

The antenna 11 receives a signal (received signal) transmitted by the base station 30 included in the circuit-switched NW300 and a signal (received signal) transmitted by the base station 40 included in the packet-switched NW400. Further, the antenna 11 transmits a signal (transmission signal) to the base station 30 included in the circuit-switched NW300 and the base station 40 included in the packet-switched NW400.

The RF / IF converter 12 converts the frequency of the received signal received by the antenna 11 (Radio Frequency) into the frequency handled by the baseband processing unit 17 (Intermediate R frequency). Further, the RF / IF converter 12 converts the frequency (intermediate frequency (IF)) of the transmission signal acquired from the baseband processing unit 17 into the frequency (radio frequency (RF)) used in wireless communication. The RF / IF converter 12 inputs a transmission signal converted to radio frequency (RF) to the power amplifier 13.

The power amplifier 13 amplifies the transmission signal acquired from the RF / IF converter 12, and inputs the amplified transmission signal to the antenna 11.

The audio input / output unit 14 has a microphone 14a for collecting audio and a speaker 14b for outputting audio. The microphone 14a inputs an audio signal to the codec processing unit 16 based on the collected sound, and the speaker 14b outputs an audio signal based on the audio signal acquired from the codec processing unit 16.

The video input / output unit 15 includes a camera 15a for capturing a subject and a display unit 15b for displaying characters, images, and the like. The camera 15a inputs a video signal to the codec processing unit 16 based on the captured video (still image or moving image), and the display unit 15b displays the video based on the video signal acquired from the codec processing unit 16. .. The display unit 15b also displays characters and the like input using the operation unit 18.

The codec processing unit 16 includes a voice codec processing unit 16a that encodes and decodes a voice signal according to a predetermined coding method (for example, G.729 specified by ITU-T) and a predetermined coding method (for example, G.729). It has a video codec processing unit 16b that encodes and decodes video signals according to MPEG (Moving Picture coding Experts Group) -4, etc.).

The voice codec processing unit 16a encodes the voice signal acquired from the voice input / output unit 14 and decodes the voice signal acquired from the baseband processing unit 17. The video codec processing unit 16b encodes the video signal acquired from the video input / output unit 15 and decodes the video signal acquired from the baseband processing unit 17.

The baseband processing unit 17 modulates the transmission signal and demodulates the received signal according to a predetermined modulation method (BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying)). Specifically, the baseband processing unit 17 modulates a baseband signal such as an audio signal or a video signal acquired from the codec processing unit 16 and converts the modulated baseband signal (transmission signal) into an RF / IF converter. Enter in 12. Further, the baseband processing unit 17 demodulates the received signal acquired from the RF / IF converter 12 and inputs the demodulated received signal (baseband signal) to the codec processing unit 16.

The baseband processing unit 17 modulates the information generated by the control unit 20 and inputs the modulated information (transmission signal) to the RF / IF converter 12. Further, the baseband processing unit 17 demodulates the received signal acquired from the RF / IF converter 12 and inputs the demodulated received signal to the control unit 20.

The operation unit 18 is a group of keys composed of an input key for inputting characters and numbers, a calling key for starting a group call, an answering key for answering an incoming call (call), and the like. Further, when each key is pressed, the operation unit 18 inputs an input signal corresponding to the pressed key to the control unit 20.

The memory 19 stores a program for controlling the operation of the mobile station 10, various data such as an incoming call history and an address book. The memory 19 is composed of, for example, a flash memory which is a non-volatile semiconductor memory, a SRAM (Static Random Access Memory) which is a volatile semiconductor memory, and the like.

Further, the memory 19 stores the voice collected by the microphone 14a as a recorded message. The recorded message is data in which the voice collected by the microphone 14a is encoded by the voice codec processing unit 16a.

The control unit 20 controls the operation of the mobile station 10 (video input / output unit 15, codec processing unit 16, baseband processing unit 17, etc.) according to the program stored in the memory 19.

Hereinafter, the configuration of the control unit according to the embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the control unit 20 according to the embodiment of the present invention.

As shown in FIG. 3, the control unit 20 includes a withdrawal processing reception unit 21, a group call processing unit 22, a recording processing unit 23, a transmission right acquisition unit 24, and a playback processing unit 25.

The withdrawal processing reception unit 21 accepts the withdrawal processing for withdrawing from the group call. Specifically, the withdrawal processing reception unit 21 receives the withdrawal instruction input by the user by the operation unit 18 during the group call, and inputs the received withdrawal instruction to the group call processing unit 22.

The group call processing unit 22 comprehensively controls the activation, execution, and termination of the application related to the group call. Specifically, when the group call processing unit 22 obtains the withdrawal instruction from the withdrawal processing reception unit 21 during the execution of the application related to the group call, if its own station does not have the transmission right, the group call processing unit 22 transmits. Instruct the transmission right acquisition unit 24 to acquire the right.

Further, the group call processing unit 22 instructs the recording processing unit 23 to record a message when the transmission right cannot be acquired.

Further, the group call processing unit 22 instructs the video input / output unit 15 to end the display of the application related to the group call when the recording process of the message by the recording processing unit 23 is completed. In this way, the group call processing unit 22 makes the user appear as if the application has been terminated by ending the display of the application related to the group call.

On the other hand, if the transmission right acquisition unit 24 acquires the transmission right after instructing the recording processing unit 23 to record the message, the group call processing unit 22 replays the recorded message to the transmission right acquisition unit 24. Instruct.

Further, the group call processing unit 22 terminates the application related to the group call when the reproduction processing of the recorded message by the transmission right acquisition unit 24 is completed.

In addition to the above-mentioned operations, the group call processing unit 22 performs a process related to address registration to the group call server 200 and various processes required for SIP.

The recording processing unit 23 performs message recording processing in response to an instruction from the group call processing unit 22. Specifically, the recording processing unit 23 encodes the voice picked up by the microphone 14a into the voice codec processing unit 16a, and stores the encoded voice as a recording message in the memory 19.

The transmission right acquisition unit 24 generates a transmission right allocation request requesting the allocation of the transmission right in response to the instruction of the group call processing unit 22, and inputs the generated transmission right allocation request to the baseband processing unit 17. The transmission right allocation request is transmitted to the group call server 200 via the baseband processing unit 17, the RF / IF converter 12, the power amplifier 13, and the antenna 11. Further, the transmission right allocation request is repeatedly transmitted at a predetermined cycle (for example, every 5 seconds) until the transmission right can be acquired.

The reproduction processing unit 25 performs reproduction processing of the recorded message in response to the instruction of the group call processing unit 22. Specifically, the reproduction processing unit 25 causes the voice codec processing unit 16a to decode the recorded message stored in the memory 19, and reproduces the decoded recorded message. The recorded message reproduced by the reproduction processing unit 25 is transmitted to the group call server 200 via the baseband processing unit 17, the RF / IF converter 12, the power amplifier 13, and the antenna 11.

Further, when the transmission right is acquired by the transmission right acquisition unit 24 during the recording process by the recording processing unit 23, the reproduction processing unit 25 reproduces the recorded message in order from the data stored in the memory 19. That is, the recorded message is transmitted to the group call server 200 in order from the data reproduced by the reproduction processing unit 25 even during the recording process by the recording processing unit 23.

(Configuration of Group Call Server) Hereinafter, the configuration of the group call server according to the embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing a group call server 200 according to an embodiment of the present invention.

As shown in FIG. 4, the group call server 200 includes a transmission / reception unit (mobile station side) 210, a group call management DB 220, a group call processing unit 230, and a transmission / reception unit (server side) 240.

The transmission / reception unit (mobile station side) 210 transmits / receives various messages specified by SIP (for example, INVITE (new), INFO (participant notification), 100Trying, 180Ringing, 200OK, ACK, BYE). The transmission / reception unit (mobile station side) 210 transmits / receives these various messages to / from the mobile station 10 through the packet switching NW400. Further, the transmission / reception unit (mobile station side) 210 receives the call data from the mobile station 10 to which the transmission right is assigned, and transmits the call data to another mobile station 10 to which the transmission right is not assigned.

The transmission / reception unit (mobile station side) 210 receives a transmission right allocation request requesting transmission right allocation from the mobile station 10. Further, when the transmission right is assigned to the mobile station 10, the transmission / reception unit (mobile station side) 210 transmits a transmission right allocation notification indicating that the transmission right has been assigned to the mobile station 10.

The group call management DB 220 is a database that stores information for managing group calls. Specifically, as shown in FIG. 5, the group call management DB 220 includes information for identifying the mobile station 10 (mobile station identifier column) and information indicating whether or not the mobile station 10 is included in the initial group (as shown in FIG. 5). Initial group column), information indicating whether or not the mobile station 10 is participating in a group call (participating member column), and information identifying the mobile station 10 to which the transmission right is assigned (transmission right column). I remember.

Here, the information in the mobile station identifier column may be any information that can identify the mobile station 10, and is the identifier of the mobile station 10, the telephone number of the mobile station 10, the SIP address of the mobile station 10, and the user name of the mobile station 10. And so on.

In the initial group column, "" is stored when the mobile station 10 is included in the initial group, and "x" is stored when the mobile station 10 is not included in the initial group. As described above, even if the mobile station 10 is not included in the initial group, it is possible to join the group call in the middle if it is called from the mobile station 10 participating in the group call.

In the participating member column, "" is stored when the mobile station 10 is currently participating in the group call, and "x" is stored when the mobile station 10 is not participating in the group call.

In the transmission right column, "" is stored when the transmission right is assigned to the mobile station 10, and "x" is stored when the transmission right is not assigned to the mobile station 10.

The group call processing unit 230 manages group calls. For example, when the group call processing unit 230 receives an INVITE (new) from the calling mobile station, it instructs the transmitting / receiving unit (server side) 240 to send an SMS (registration request) transmission request.

When the group call processing unit 230 receives the transmission right allocation request requesting the allocation of the transmission right from the mobile station 10, the transmission right depends on whether or not the transmission right has already been assigned to the other mobile station 10. Allocate the transmission right to the mobile station 10 that sent the allocation request. That is, the group call processing unit 230 allocates the transmission right to the mobile station 10 that has transmitted the transmission right allocation request when the transmission right is not assigned to the other mobile station 10.

Subsequently, the group call processing unit 230 instructs the transmission / reception unit (mobile station side) 210 to transmit a transmission right allocation notification indicating that the transmission right has been assigned. The transmission / reception unit (mobile station side) 210 transmits a transmission right allocation notification to the mobile station 10 to which the transmission right is assigned.

The time when the transmission right is activated is the transmission right from the viewpoint of giving the users sufficient time to transmit the call data and equally distributing the opportunity to transmit the call data to each user. Limited to the time limit (eg 30 seconds). That is, the transmission right is automatically released to other users when the transmission right time limit elapses.

The transmission / reception unit (server side) 240 transmits an SMS (registration request) transmission request SMS server 100 in response to an instruction from the group call processing unit 230.

(Operation of Communication System) Hereinafter, the operation of the communication system according to the embodiment of the present invention will be described with reference to the drawings. 6 and 7 are sequence diagrams showing the operation of the communication system according to the embodiment of the present invention. In addition, in FIG. 6 and FIG. 7, as described above, it is assumed that the transmitting side mobile station is the mobile station 10a and the designated mobile station is the mobile station 10b to the mobile station 10d. In addition, in FIGS. 6 and 7, some of the various processes specified by SIP (for example, transmission / reception of INFO (participant notification), 100Trying, 180Ringing, 200OK, ACK, BYE, etc.) are omitted. It should be noted.

As shown in FIG. 6, in step 10, the mobile station 10a registers (logs in) an address to the group call server 200.

In step 11, the mobile station 10a transmits an INVITE (new) to the group call server 200 to initiate a group call. INVITE (new) includes an identifier that identifies a designated mobile station (mobile station 10b to mobile station 10d).

In step 12, the group call server 200 transmits an SMS (registration request) transmission request to the designated mobile station to the SMS server 100.

In steps 13b to 13d, the SMS server 100 transmits an SMS (registration request) to each designated mobile station.

In steps 14b to 14d, each designated mobile station registers (logs in) an address to the group call server 200.

In steps 15b to 15d, the group call server 200 transmits an INVITE (new) for calling each designated mobile station to each designated mobile station.

In steps 16b to 16d, mobile stations 10b to 10d respond to INVITE (new).

In step 17, a group call with mobile stations 10a to 10d as participating members is started.

Subsequently, as shown in FIG. 7, in step 20, a group call with mobile stations 10a to 10d as participating members continues. The transmission right is assigned to the mobile station 10 (mobile station 10a) other than the mobile station 10d.

In step 21, the mobile station 10d accepts the withdrawal process of leaving the group call in response to the user's operation on the operation unit 18.

In step 22, the mobile station 10d transmits a transmission right allocation request requesting transmission right allocation to the group call server 200.

In step 23, the group call server 200 assigns a transmission right indicating that the transmission right cannot be assigned because the transmission right has already been assigned to the mobile station 10 (mobile station 10a) other than the mobile station 10d. Send a disapproval notification to mobile station 10d.

In step 24, the mobile station 10d performs the recording process. Specifically, the mobile station 10d encodes the voice picked up by the microphone 14a in the voice codec processing unit 16a, and stores the encoded voice in the memory 19 as a recorded message.

In step 25, the mobile station 10d ends the display of the application related to the group call.

In step 26, the mobile station 10d transmits a transmission right allocation request requesting transmission right allocation to the group call server 200. In the following, it is assumed that the transmission right assigned to the mobile station 10 (mobile station 10a) other than the mobile station 10d is released, for example, when the transmission right time limit elapses (step 34). ..

In step 27, since the transmission right is released, the group call server 200 allocates the transmission right to the mobile station 10d and transmits a transmission right allocation notification indicating that the transmission right has been assigned to the mobile station 10d.

In step 28, the mobile station 10d performs a reproduction process. Specifically, the mobile station 10d decodes the recorded message stored in the memory 19 by the voice codec processing unit 16a, and reproduces the decoded recorded message.

In step 29, the mobile station 10d transmits the recorded message reproduced in step 29 to the group call. That is, the mobile station 10d transmits a recorded message as call data to the mobile stations 10a to 10c.

In step 30, the mobile station 10d cancels the address registration to the group call server 200.

In step 31, the mobile station 10d terminates the application related to the group call.

In steps 32a to 32c, the group call server 200 transmits (INFO (participant update notification)) indicating that the participating members of the group call have been updated to the mobile stations 10a to 10c.

In step 33, a group call with mobile stations 10a to 10c as participating members is continued.

(Action and Effect) According to the mobile station 10 according to the embodiment of the present invention, the memory 19 stores and transmits the sound picked up by the microphone 14a as a recorded message when the transmission right is not assigned. The right acquisition unit 24 acquires the transmission right after finishing the display of the application. Further, the group call processing unit 22 transmits the recorded message stored in the memory 19 to the group call when the transmission right is acquired by the transmission right acquisition unit 24. That is, the mobile station 10 transmits a recorded message to the group call in the background without requiring any user operation while making the user appear to have finished the application.

Therefore, it is possible to facilitate the transmission of a message such as leaving the group call and improve the convenience of the user.

[Other Embodiments]

Although the present invention has been described by embodiments described above, the statements and drawings that form part of this disclosure should not be understood to limit the invention. Various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art from this disclosure.

For example, in the above-described embodiment, the SMS server 100 and the group call server 200 have been described as separate servers, but the present invention is not limited to this. Specifically, one network server connected to both the circuit-switched NW300 and the packet-switched NW400 may have both the functions of the SMS server 100 and the functions of the group call server 200.

Further, in the above-described embodiment, the mobile station 10 decodes the recorded message stored in the memory 19 by the voice codec processing unit 16a, reproduces the decoded recorded message, and makes a group call with the reproduced recorded message. Sends to server 200, but is not limited to this. Specifically, the mobile station 10 may transmit the recorded message stored in the memory 19 to the group call server 200 without decoding it.

Further, in the above-described embodiment, the mobile station 10 encodes the voice picked up by the microphone 14a in the voice codec processing unit 16a and stores the encoded voice as a recorded message in the memory 19. It is not limited to. Specifically, the mobile station 10 may store the voice picked up by the microphone 14a in the memory 19 as a recorded message without encoding.

In this case, the mobile station 10 may encode the recorded message stored in the memory 19 by the voice codec processing unit 16a and transmit the encoded recorded message to the group call server 200.

Further, in the above-described embodiment, the mobile station 10 confirms with the user whether to leave a message before the withdrawal instruction is input by the operation unit 18 and the transmission right allocation request is transmitted, and the instruction from the user is given. Based on this, it may be decided whether or not to perform processing related to recording and transmission of the message.

<figref num="1">It is a figure which shows the structure of the communication system which concerns on one Embodiment of this invention.</figref><figref num="2">It is a block diagram which shows the structure of the mobile station 10 which concerns on one Embodiment of this invention.</figref><figref num="3">It is a block diagram which shows the structure of the control part 20 which concerns on one Embodiment of this invention.</figref><figref num="4">It is a block diagram which shows the structure of the group call server 200 which concerns on one Embodiment of this invention.</figref><figref num="5">It is a figure which shows the information stored in the group call management DB 220 which concerns on one Embodiment of this invention.</figref><figref num="6">It is a sequence diagram which shows the operation of the communication system which concerns on one Embodiment of this invention (the 1).</figref><figref num="7">It is a sequence diagram which shows the operation of the communication system which concerns on one Embodiment of this invention (the 2).</figref>

Code description

10 ... mobile station, 11 ... antenna, 12 ... RF / IF converter, 13 ... power amplifier, 14 ... audio input / output unit, 14a ... microphone, 14b ... speaker , 15 Video input / output unit, 15a Camera, 15b Display unit, 16 Codec processing unit, 16a Audio codec processing unit, 16b Video codec processing unit, 17 Base band processing unit, 18 Operation unit, 19 Memory, 20 Control unit, 21 Leave processing reception unit, 22 Group call processing unit, 23 Recording processing unit, 24 ... Transmission right acquisition unit, 25 ... Playback processing unit, 30 ... Base station, 40 ... Base station, 100 ... SMS server, 200 ... Group call server, 210 Transmission / reception unit (mobile station side), group call management DB 220, group call processing unit 230, transmission / reception unit (server side) 240, 300 line exchange NW, 400 packet exchange NW