JP2589954B2 - Mobile 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 communication system capable of performing broadcast communication between mobile stations.

[0002]

2. Description of the Related Art In recent years, with the advance of advanced information technology, a mobile communication system excellent in immediacy and functionality has attracted attention, and has been realized in various forms such as mobile phones, car phones, and MCA radios. Furthermore, toward the realization of a PHP (Personal Handy Phone, a second-generation cordless telephone) system that is an ideal mobile communication system that enables "anytime, anywhere, anyone" communication Preparations are underway. This PHP system is used as a digital cordless telephone instead of a conventional analog cordless telephone, and is capable of carrying and communicating indoors and outdoors such as in a home or office. It comprises a small and lightweight terminal, an indoor base station which is a so-called cordless telephone master unit, a large number of outdoor base stations arranged outdoors, and a wireless communication line between the outdoor base stations. The terminal is connected to a public line via an indoor base station when indoors and via a nearby outdoor base station when outdoors and can communicate with a destination. Becomes Further, there is a feature that the base station becomes a relay station, which enables direct communication with another mobile station. In addition, a 1.9 GHz band is used as a radio frequency band to be used, and 30
0 kHz, the time division multiple access system (TDMA system) as an access system, the time division bidirectional transmission system (TDD system) as a transmission system, the duplex system (simultaneous transmission / reception system) as a communication system, and As a method, a quaternary phase modulation (π / 4 shift QPSK) method is used.

[0003] By the way, in operating a mobile communication system, a plurality of radio stations, such as an emergency contact, are
It may be necessary to send the same notification at the same time. In such a case, so-called broadcast communication is performed, and a request for simultaneous reception is made from the wireless station that is the caller. As an example of such a conventional broadcast communication system, for example, Japanese Unexamined Patent Application Publication No. 63-282129 discloses that when a radio base station receives a request for a broadcast call from a radio telephone, that is, a mobile station, all radio stations in a group are transmitted. A technique of wirelessly relaying a broadcast call signal to a wireless telephone has been disclosed. In addition,
All wireless telephones in the group are all wireless telephones that are registered in the wireless zone served by the wireless base station and provided for mobile communication, and each wireless telephone is assigned an identification number. Have been.

[0004]

However, in the above-mentioned conventional broadcast communication method, a radio channel for control is used at the time of simultaneous incoming call, and a radio channel for communication is used at the time of broadcast communication. There is a problem that the time required for the broadcast communication and the channel resources are extraly used as compared with the case where the broadcast communication is immediately performed using one communication wireless channel. In addition, since the broadcast must always pass through the base station, there is a problem that the broadcast cannot be performed if the communication channel is not available due to the base station using an outside line. . In addition, since the address of the wireless station of the broadcast destination cannot be specified, there is a problem that even if the address of the wireless station that is not required among the wireless stations on the receiving side is known in advance, it is targeted for simultaneous incoming call. In addition, since the service of the radio station of the broadcast destination cannot be specified, there is also a problem that appropriate communication cannot be performed such as erroneously calling a facsimile apparatus.

[0005] The present invention has been made in view of the above circumstances, and a wireless station that has requested simultaneous paging controls a plurality of addresses by grouping a plurality of addresses while controlling a broadcast state using one wireless channel for communication. Mobile stations that can broadcast only to a specific radio station, perform broadcast only to a radio station of a specific service, or implement one-to-one communication with a specific radio station. It is an object to provide a communication system.

[0006]

[0007]

According to the present invention, there is provided a mobile communication system in which a radio station can simultaneously call another plurality of radio stations. A paging means for transmitting a paging control signal from a radio station requesting paging to a plurality of other radio stations by using one available radio channel among communication radio channels; The station monitors the radio channel sequentially,
When a broadcast control signal is received by one radio channel, broadcast standby means for subsequently waiting for a broadcast signal from a radio station on the broadcast request side by the radio channel, and 1 When the broadcast transmission means for transmitting a broadcast signal by the two radio channels and the broadcast transmission means of the radio station on the paging request side transmit the broadcast signal, the data stored in the broadcast signal is transmitted. Effectiveness·
A broadcast data validity designating means for designating invalidity is provided. When each receiving station receives a broadcast signal, if the data is designated to be valid, the data is acquired, and the data is acquired. Is characterized in that data is discarded when it is specified that is invalid.

[0008]

According to a second aspect of the present invention, a simultaneous incoming call control signal is transmitted from a wireless station requesting a simultaneous incoming call to another plurality of wireless stations through one available wireless channel among a plurality of communication wireless channels. A service designating paging means for designating a paging radio station by setting specific service information of the services of the radio stations on the receiving side as control information in the paging control signal at that time; ,
Each radio station on the receiving side sequentially monitors the radio channel, and
Broadcast receiving means for receiving a broadcast signal from the broadcast station on the broadcast request side when the broadcast control signal is received on one of the wireless channels; Broadcast transmission means for transmitting a broadcast signal through one wireless channel.

A third aspect of the present invention is a mobile communication system in which a radio station can simultaneously call another plurality of radio stations, wherein each radio station has a plurality of radio channels for communication. One of the available wireless channels uses a simultaneous call receiving means for transmitting a simultaneous call control signal from a wireless station requesting a simultaneous call to a plurality of other wireless stations, and each wireless station on the receiving side sequentially switches the wireless channel. Monitoring, when a broadcast control signal is received through the one radio channel, broadcast standby means for subsequently waiting for a broadcast signal from the broadcast station on the broadcast request side by the wireless channel; A broadcast transmitting means for transmitting a broadcast signal from the wireless station through the one wireless channel, and a state in which the wireless station which has requested the simultaneous incoming call maintains a broadcast communication state with each of the receiving side wireless stations. At this time, by transmitting a broadcast signal including the control information of the polling request, polling request means for sequentially polling each wireless station, and each of the receiving-side wireless stations transmits the control information of the polling request. And polling response means for returning a polling response signal when receiving a broadcast signal including the polling response signal.

According to a fourth aspect of the present invention, in place of the polling request means of the third aspect, the wireless station which has requested the simultaneous incoming call is maintained in a state of maintaining the broadcast communication state with each of the receiving side wireless stations. A radio station that transmits a broadcast signal including control information of a polling request and, at that time, manages the address of the radio station to be polled, thereby sequentially polling only a specific group of radio stations. It is characterized in that designated polling request means is provided.

According to a fifth aspect of the present invention, in addition to the configuration of the third aspect, the wireless station that has requested simultaneous paging maintains the polling state with each of the wireless stations on the receiving side while maintaining the polling state. When performing a broadcast transmission from, when receiving a broadcast signal including control information of the polling request, by setting the control information of the press talk request and the broadcast data in the press talk request signal and transmitting, Press talk requesting means for requesting a press talk to the broadcast requesting wireless station; and, when the broadcast request wireless station accepts the press talk request of the called wireless station, to each wireless station. A press talk receiving means for setting the broadcast data stored in the press talk request signal and the control information of the press talk reception as a broadcast signal and transmitting the broadcast, and When the wireless station on the side cancels the press-talk request, the control information and data of the press-talk off request are set in the press-talk-off signal and transmitted, so that each radio station is again put into the polling state. Request means.

According to a sixth aspect of the present invention, in place of the press-talk requesting means of the fifth aspect, the radio station that has requested simultaneous paging maintains the polling state with each of the radio stations on the receiving side while maintaining the polling state. In the case of performing broadcast transmission from a wireless station, when a broadcast signal including control information of a polling request is received, the control information of the press talk request and the broadcast data are set in the press talk request signal and transmitted. In this way, a request for a press talk is made to the broadcast requesting wireless station, and at that time, the address information of a specific group of the broadcast wireless stations is set in the control information of the press talk request signal. An address designation press talk requesting means for designating the transmission destination of the broadcast signal is provided, and instead of the press talk accepting means, the simultaneous call requesting wireless station is pressed by the called wireless station. When the request for the talk is received, the broadcast data stored in the press talk request signal for each wireless station, the control information of the press talk reception, and the identification of the wireless station to which the press talk request signal is broadcast are specified. And an addressing press-talk receiving means for setting the address information of the group and the broadcast signal and transmitting the broadcast signal.

According to a seventh aspect of the present invention, in addition to the configuration of the third aspect, the radio station on the called side maintains the polling state with the radio stations on the called side while the radio station requesting the simultaneous incoming call is maintained. However, when performing a one-to-one communication with a radio station that has requested a general call, when a polling request signal is received, a one-to-one communication request including control information of a one-to-one communication request to the radio station on the general call request side is received. A one-to-one communication requesting means for requesting one-to-one communication by transmitting a signal; and a one-to-one communication reception when the simultaneous call requesting wireless station receives a one-to-one communication request of the receiving-side wireless station. A one-to-one communication accepting unit that transmits a broadcast signal including control information of the one-to-one communication state that shifts to a one-to-one communication state using the wireless channel used for the simultaneous incoming call,
Broadcast communication canceling means for returning a wireless station other than the wireless station performing one-to-one communication among the wireless stations on the receiving side to the control for waiting for an incoming call from another wireless station again.

[0015]

[0016]

According to the first aspect of the present invention, the simultaneous receiving means comprises:
What is claimed is: 1. A mobile communication system in which a radio station can perform simultaneous paging to a plurality of other radio stations, wherein each radio station is provided with one available radio channel among a plurality of communication radio channels. A simultaneous incoming call control signal is transmitted from a wireless station requesting simultaneous incoming call to a plurality of other wireless stations. The broadcast standby unit is configured to sequentially monitor the radio channels by the radio stations on the receiving side, and when the broadcast station receives the broadcast control signal through the one radio channel, the broadcast station waits for a broadcast from the radio station on the broadcast request side using the radio channel. Wait for a broadcast signal. The broadcast transmission means transmits a broadcast signal from the radio station on the simultaneous call request side via the one radio channel. The broadcast transmission data validating means specifies validity / invalidity of data stored in the broadcast signal when the broadcast transmitting means of the radio station on the general call request side transmits the broadcast signal.
When each receiving radio station receives the broadcast signal, if the data is specified to be valid, the data is obtained.If the data is specified to be invalid, the data is obtained. Is destroyed.

[0017]

[0018] In the invention of claim 2, the service-designated paging means is configured to switch from a radio station requesting paging to another plu- rality of radio stations by using one available radio channel among a plurality of communication radio channels. , And at that time, by setting specific service information among the services of each radio station on the receiving side as control information in the general call control signal, designation of the radio station that receives the general call Perform The broadcast standby unit is configured to sequentially monitor the radio channels by the radio stations on the receiving side, and when the broadcast station receives the broadcast control signal through the one radio channel, the broadcast station waits for a broadcast from the radio station on the broadcast request side using the radio channel. Wait for a broadcast signal. The broadcast transmission means transmits a broadcast signal from the radio station on the simultaneous call request side via the one radio channel.

In the third aspect of the present invention, the simultaneous call receiving means is a mobile communication system that allows a radio station to simultaneously call another plurality of radio stations. A simultaneous call control signal is transmitted from a wireless station requesting a simultaneous call to a plurality of other wireless stations using one of the available wireless channels. The broadcast standby unit is configured to sequentially monitor the radio channels by the radio stations on the receiving side, and when the broadcast station receives the broadcast control signal through the one radio channel, the broadcast station waits for a broadcast from the radio station on the broadcast request side using the radio channel. Wait for a broadcast signal. The broadcast transmission means transmits a broadcast signal from the radio station on the simultaneous call request side via the one radio channel. The polling request means transmits a broadcast signal including control information of the polling request when the wireless station that has requested the simultaneous incoming call maintains a broadcast communication state with each of the called wireless stations. Then, polling is sequentially performed for each wireless station. The polling response means returns a polling response signal when each receiving-side radio station receives a broadcast signal including the control information of the polling request.

In the invention according to claim 4, the radio station designating polling request means, when the radio station requesting the simultaneous call is in a state where the broadcast state with each radio station on the receiving side is maintained. A broadcast signal including control information of a polling request is transmitted, and at that time, the address of the radio station to be polled is managed, so that only the radio stations in a specific group are sequentially polled.

In the invention of claim 5, the press-talk requesting means transmits the broadcast from the receiving-side radio station while the polling-requesting radio station maintains a polling state with each of the receiving-side radio stations. When transmitting, when a broadcast signal including control information of a polling request is received, the control information of the press talk request and the broadcast data are set in the press talk request signal and transmitted, so that the simultaneous incoming call request is made. Request a press talk to the wireless station on the side. The press talk receiving means, when the simultaneous call requesting wireless station receives the press talk request from the called wireless station, broadcast data stored in the press talk request signal for each wireless station. And the control information for accepting the press talk are set as a broadcast communication signal and broadcast. The press-talk-off requesting means sets the control information and data of the press-talk-off request to a press-talk-off signal and transmits the press-talk-off signal when the receiving-side radio station that has made the press-talk request cancels the press-talk request By doing so, each wireless station is again brought into the polling state.

In the invention of claim 6, the address designation press-talk requesting means sends the broadcast request from the called-side radio station while maintaining the polling state with the called-side radio stations. In the case of performing the broadcast transmission, when the broadcast signal including the control information of the polling request is received, the control information of the press talk request and the broadcast data are set in the press talk request signal and transmitted, whereby the broadcast is simultaneously performed. A request for a press talk is made to the radio station on the incoming call request side. At this time, the address information of a specific group among the radio stations of the broadcast destination is set in the control information of the press talk request signal by setting the address information. Specify the destination of the communication signal. The address designation press talk receiving means, when the simultaneous call requesting wireless station receives a request for press talk from the called wireless station, stores the press talk request signal stored in the press talk request signal for each wireless station. The broadcast data, the control information for accepting the press talk, and the address information of the specific group of the wireless station to which the press talk request signal is broadcast are set as the broadcast signal and broadcast.

[0023] In the invention of claim 7, the one-to-one communication requesting means, while maintaining the polling state between the wireless station requesting the simultaneous incoming call and each of the incoming wireless stations, When performing a one-to-one communication with a radio station that has requested simultaneous paging, when a polling request signal is received, a one-to-one communication request signal including control information of a one-to-one communication request is transmitted to the radio station on the general paging request side. By transmitting, a request for one-to-one communication is made. The one-to-one communication receiving means transmits a broadcast signal including control information of one-to-one communication reception when the simultaneous call requesting wireless station receives a request for one-to-one communication of the receiving side wireless station. Then, the state shifts to the one-to-one communication state using the wireless channel used for the simultaneous incoming call. The broadcast canceling means returns the wireless stations other than the wireless station performing the one-to-one communication among the wireless stations on the receiving side to the control for waiting for an incoming call from another wireless station again.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Embodiment 1) FIG. 1 is a conceptual explanatory view of a mobile communication system according to Embodiment 1 of the present invention. A system configuration in which one mobile station uses one radio channel to simultaneously receive calls to a plurality of other mobile stations. The mobile station A includes a mobile station A that makes a simultaneous call request and mobile stations B to D on the receiving side. Although there are actually more mobile stations on the receiving side, in order to make the explanation easy to understand, here, only three mobile stations B to D are used. The mobile station A and the mobile stations B to D can communicate with each other within the wireless zone Z. Mobile station A
Broadcast receiving means 1, broadcast transmitting means 2, and broadcast data validity specifying means 3 are provided, and mobile stations B to D are each provided with broadcast waiting means 4. Note that mobile stations B to D
Also, a broadcast receiving means 1, a broadcast transmitting means 2, and a broadcast data validity specifying means 3 are provided, and the mobile station A is also provided with a broadcast waiting means 4. Illustration is omitted for the sake of simplicity. Further, mobile stations A to D
Has many other components for communication in addition to those described above, but they are well known and have no direct relation to the gist of the present invention, and therefore description thereof is omitted. Further, the omission of these is the same in each of the following embodiments. The general call receiving means 1 transmits a general call control signal from a mobile station A requesting a general call to another plurality of mobile stations B to D using one available radio channel among a plurality of communication radio channels. Send. That is, the simultaneous call receiving means 1 performs the simultaneous call reception by transmitting the simultaneous call control signal a shown in FIG. 2 to each of the mobile stations B to D. The simultaneous incoming call control signal a is
The area includes a wireless connection area and a general incoming call control area. In the general incoming call control area, designated group address information and designated service information can be set. Broadcast transmission means 2
A broadcast signal is transmitted from the mobile station A on the simultaneous call request side via one wireless channel. That is, the broadcast transmitting means 2
Transmits the broadcast signal b shown in FIG. 3 to each of the mobile stations B to D. The broadcast signal b includes a wireless connection area, a broadcast control area, and a broadcast information area. In the broadcast control area, a control type and an address of a target wireless station can be set. In the broadcast information area, valid / invalid of broadcast information data and broadcast information data can be set. Broadcast transmission data validity specifying means 3 specifies validity / invalidity of data stored in the broadcast signal b when the broadcast transmission means 2 transmits the broadcast signal b. That is, the broadcast transmission data validity specifying means 3 outputs the broadcast signal b
In the broadcast information area, whether the broadcast information data is valid or invalid is set. The broadcast waiting means 4 is adapted to monitor the radio channels sequentially by the mobile stations B to D on the receiving side. It waits for a broadcast signal b from the mobile station A. That is, the broadcast standby unit 4 causes each of the mobile stations BD to wait for a broadcast signal from the mobile station A when each of the mobile stations BD receives the simultaneous incoming call control signal a.

Next, the operation of the mobile communication system will be described with reference to FIG.
This will be described with reference to the control sequence shown in FIG. First, the mobile station A selects a channel and a slot for simultaneous paging, and the simultaneous paging means 1 continuously transmits the simultaneous paging control signal a. Note that a slot is a group of bit strings corresponding to physical channels multiplexed on the time axis in the TDMA system. On the other hand, the receiving-side mobile stations BD sequentially monitor a plurality of channels used among the mobile stations A-D. , And the subsequent broadcast signal b is awaited on the channel and slot where the simultaneous incoming call control signal a is received. The mobile station A continuously transmits the simultaneous incoming call control signal a, and after a sufficient time T1 to reach the broadcast standby state has elapsed, the broadcast transmitting means 2 transmits the broadcast to each of the mobile stations BD. By transmitting the signal b, the mobile stations A to D enter a broadcast communication state. The broadcast data validity specifying means 3 sets the broadcast information data to be valid or invalid in the broadcast information area of the broadcast signal b, thereby specifying whether the broadcast information data is valid or invalid. This can be done at the time of transmission. Then, the mobile stations B to D determine at the time of reception whether the broadcast information data is set to be valid or invalid in the broadcast information area of the broadcast signal b. And decide whether to take in or discard the broadcast information data. The control information is invalid immediately after the simultaneous incoming call.

As described above, it is possible to immediately shift to the broadcast communication state using one communication radio channel without passing through the base station. For this reason, even if the communication channel of the base station is not vacant, broadcast communication can be performed between the mobile stations, and effective use of the radio channel can be achieved. Further, since the broadcast data validity specifying means 3 is provided, it is possible to specify whether the broadcast data is valid or invalid. (Embodiment 2) FIG. 5 is a conceptual explanatory view of a mobile communication system according to Embodiment 2 of the present invention. The difference from the first embodiment shown in FIG. The point is that a designated simultaneous receiving means 6 is provided. The address designation simultaneous incoming call means 6 controls simultaneous incoming call control from a mobile station A requesting simultaneous incoming call to other mobile stations B to D by using one available wireless channel among a plurality of communication wireless channels. By transmitting the signal a, at this time, by setting the address information of a specific group among the mobile stations B to D on the receiving side as the control information in the general incoming call control signal a,
Specify the mobile station that receives the call at once. That is, the address designated simultaneous receiving means 6 sets designated group address information in the simultaneous incoming call control area of the simultaneous incoming call control signal a when transmitting the simultaneous incoming call control signal a at the time of simultaneous incoming call. By specifying the address of a specific group in this way, the mobile station that receives the simultaneous call can be specified by the address.

Next, the operation of the mobile communication system will be described with reference to FIG.
This will be described with reference to the control sequence shown in FIG. The control sequence of FIG. 6 is different from the control sequence of the first embodiment shown in FIG. 4 in that the address of the mobile station that performs the simultaneous call is specified at the time of the simultaneous call. Mobile station B on the receiving side
D receives the simultaneous incoming call control signal a from the mobile station A, refers to the designated group address information of the simultaneous incoming call control area of the simultaneous incoming call control signal a, and if it matches with the own station, the subsequent simultaneous incoming call. Control from the incoming call to the broadcast state is performed, and if they do not match, all control information relating to subsequent simultaneous incoming calls is discarded. As a result, designation of a mobile station that receives a call simultaneously can be performed by using an address. In this example, since the mobile stations C and D are designated, the mobile station B discards the simultaneous incoming call control signal a and the broadcast signal b.

As described above, since a plurality of addresses are grouped and broadcast is performed only to a specific radio station while controlling the broadcast state, various broadcast destination terminals such as a facsimile apparatus and a telephone can be used. , The address can be specified in advance, and appropriate communication without errors can be performed. (Embodiment 3) FIG. 7 is a conceptual explanatory view of a mobile communication system according to Embodiment 3 of the present invention. The difference from the mobile communication system of Embodiment 1 shown in FIG. Is provided with a service designation simultaneous incoming call means 8. The service designation simultaneous call receiving means 8 performs simultaneous call control from the mobile station A requesting the simultaneous call to the other plurality of mobile stations B to D by using one available radio channel among the plurality of communication radio channels. A signal a is transmitted, and at this time, by specifying specific service information among the services of the mobile stations B to D on the receiving side as control information in the general incoming call control signal a, designation of the mobile station that receives the general incoming call is designated. Do.
That is, the service designation simultaneous receiving means 8 sets the designated service information in the simultaneous incoming call control area of the simultaneous incoming call control signal a when transmitting the simultaneous incoming call control signal a at the time of simultaneous incoming call. By designating a specific service name in this way, a mobile station that receives a call simultaneously can be designated by the service name.

Next, the operation of the mobile communication system will be described with reference to FIG.
This will be described with reference to the control sequence shown in FIG. The control sequence of FIG. 8 differs from the control sequence of the first embodiment shown in FIG. 4 in that the designation of the mobile station that performs the simultaneous call is performed by the service name at the time of the simultaneous call. The mobile stations B to D on the receiving side are the service designation simultaneous receiving means 8 of the mobile station A.
When the general incoming call control signal a is received from the terminal, the service information set in the general incoming call control area of the general incoming call control signal a is referred to. Control to reach the broadcast state is performed, and if they do not match, all control information relating to subsequent simultaneous incoming calls is discarded. As a result, the designation of the mobile station receiving the simultaneous call can be made by the service name. In this example, since the telephone service is specified, the mobile station B of the FAX service discards the simultaneous incoming call control signal a and the broadcast signal b.

As described above, while controlling the broadcast state, the broadcast is performed only to the mobile station of the specific service, so that various broadcast destination terminals such as a facsimile apparatus and a telephone can be transmitted in advance. The service can be specified, and appropriate communication without error can be performed. (Embodiment 4) FIG. 9 is a conceptual explanatory diagram of a mobile communication system according to Embodiment 4 of the present invention. The difference from the first embodiment shown in FIG. , Mobile stations B to D are provided with polling response means 11. The polling request means 10 includes control information of a polling request when the mobile station A that has requested the simultaneous incoming call maintains a broadcast communication state with each of the mobile stations B to D on the receiving side. By transmitting the broadcast signal b, polling is sequentially performed on each of the mobile stations B to D. That is, the polling request means 10 sequentially sends out the broadcast signal b to each of the mobile stations B to D in the broadcast state, and at this time, the control type information is stored in the broadcast control area of the broadcast signal b. As "Polling Request". Each of the mobile stations B to D receiving the broadcast signal b refers to the information on the address of the target wireless station set in the broadcast control area of the broadcast signal b, and sets the address of its own station. In this case, the polling response means 11 returns a polling response signal when each of the mobile stations B to D on the receiving side receives the broadcast signal b including the control information of the polling request. That is, the polling response means 11 transmits the reply signal c shown in FIG. 10 to the mobile station A as a polling response signal. The reply signal c includes a wireless connection area, a control area, and an information area. Control type information and broadcast destination address information can be set in the control area, and broadcast information data can be set in the information area. It is. Then, when transmitting the reply signal c as the polling response signal, the polling response means 11 sets "polling response" as the control type information in the control area.

Next, with regard to the operation of the mobile communication system, refer to the control sequence shown in FIG. 11 in the case where the mobile station A, which has requested a paging request from the broadcast state, broadcasts a polling request and enters the polling state. I will explain while. First, the polling request means 10 of the mobile station A which has requested the simultaneous incoming call transmits a polling request. At this time, “Polling request” as control type information, “C” as address information of the target wireless station, and broadcast information valid / invalid in the broadcast information area in the broadcast control area of the broadcast signal b. "Valid" is set together with the broadcast information data as the designated information. Of the mobile stations B to D that have received the broadcast signal b, the mobile station C to be polled receives the broadcast signal b, and the mobile stations B and D that are not targeted are broadcast. Discard the signal b. Polling response means 1 of mobile station C receiving the polling request
1 transmits a reply signal c as a polling response signal to the mobile station A as a response. At this time, "polling response" is set as the control type information in the control area of the reply signal c as the polling response signal. Subsequently, the mobile station A makes a polling request to the mobile station D,
The broadcast signal b is transmitted. This, as above,
The polling response means 11 of the mobile station D transmits a reply signal c as a polling response signal to the mobile station A.

As described above, polling communication can be performed as it is from the broadcast communication state, which is an effective means for improving services. (Embodiment 5) FIG. 12 is a conceptual explanatory diagram of a mobile communication system according to Embodiment 5 of the present invention. This mobile communication system differs from the mobile communication system of Embodiment 4 shown in FIG. The point is that a wireless station designation polling request means 13 is provided in place of the request means 10. The radio station designation polling request means 13 transmits the polling request control information when the mobile station A, which has requested the simultaneous incoming call, maintains the broadcast communication state with each of the receiving side mobile stations BD. Is transmitted, and at this time, by managing the addresses of the mobile stations to be polled, polling is sequentially performed only for mobile stations in a specific group. That is, the radio station designation polling request means 13 manages the addresses of the mobile stations requesting the polling in advance, and sequentially performs polling according to the management list.

Next, with regard to the operation of the mobile communication system, refer to the control sequence shown in FIG. 13 in the case where the mobile station A, which has requested the paging request from the broadcast state, broadcasts a polling request to enter the polling state. I will explain while. This control sequence differs from the control sequence of the fourth embodiment shown in FIG. 11 in that the mobile station A issues a polling request according to a polling address list managed in advance. That is, since the mobile stations B and D are registered in the polling address list, the mobile stations C out of the polling address list are registered.
Cannot receive the polling request from mobile station A.

As described above, polling communication can be performed by directly specifying a mobile station from the broadcast communication state, which is an effective means for improving services. (Embodiment 6) FIG. 14 is a conceptual explanatory view of a mobile communication system according to Embodiment 6 of the present invention. This mobile communication system differs from the mobile communication system of Embodiment 4 shown in FIG. It is provided with the talk receiving means 15, and the mobile stations B to D on the receiving side are provided with the press talk request means 16 and the press talk off request means 17. The press talk requesting means 16 sends the broadcast request to the mobile station A
Performs broadcast transmission from the mobile stations B to D on the receiving side while maintaining the polling state between the mobile stations B to D on the receiving side, the broadcast signal b including the control information of the polling request. Is received, the control information of the press talk request and the broadcast data are set as a reply signal c as the press talk request signal and transmitted, so that the press talk request is transmitted to the mobile station A on the general call request side. Make a request. That is, when each of the mobile stations B to D receiving the polling request has a request for broadcast transmission by press talk, the press talk request means 16 replaces the reply signal c as a polling response signal when shifting to the polling state. A reply signal c as a press talk request signal is transmitted. At this time, "press talk request" is set as control type information in the control area of the reply signal c as the press talk request signal. When the mobile station A on the general incoming call request side receives a request for press talk from the mobile stations B to D on the receiving side, the press talk receiving means 15 sends a press talk request signal to each of the mobile stations BD. The broadcast data stored in the reply signal c and the control information for accepting the press talk are set in the broadcast signal b and transmitted by broadcast. That is, the press talk receiving means 15
When a press talk request from the press talk request means 16 is received, a broadcast signal b as a press talk acceptance signal is broadcasted together with the data set in the press talk request. At this time, "press talk reception" is set as control type information in the broadcast control area of the broadcast signal b as the press talk reception signal. The press-talk-off requesting means 17 uses the control information and data of the press-talk-off request as a press-talk-off signal when the receiving-side mobile stations B to D requesting the press-talk cancel the press-talk request. By setting and transmitting the reply signal c, each of the mobile stations A to D is again brought into the polling state. That is, the press-talk-off requesting means 17 transmits a press-talk-off request from the mobile station which made the press-talk request when canceling the press-talk request. At this time, "press talk off request" is set as control type information in the control area of the reply signal c as the press talk off signal.

Next, with respect to the operation of the mobile communication system, FIG. 15 shows a case in which the state shifts to the broadcast communication state by the press talk by the press talk request from the receiving side mobile station, and again becomes the polling state by the press talk off request.
This will be described with reference to the control sequence shown in FIG. The mobile station A transmits a broadcast signal b as a polling request signal to the mobile station D. When the mobile station D that has received the broadcast signal b has a request for the broadcast transmission by the press talk, the reply signal c as the press talk request signal is transmitted by the press talk request means 16 instead of the polling response signal. . If mobile station A accepts this,
The press talk receiving means 15 sets “press talk reception” as control type information in the broadcast control area of the broadcast signal “b” and sends the broadcast information of the press talk request to each of the mobile stations B to D together with the broadcast information of the press talk request. Broadcast. As a result, a broadcast communication state of the mobile station D is returned and broadcasted via the mobile station A, and the mobile station D enters a press talk communication state. On the other hand, mobile station D
Ends the press talk, the press talk off requesting means 17 transmits the reply signal c as the press talk off request signal, so that the mobile station A starts polling again, and To transmit a broadcast signal b as a polling request signal.

As described above, since the press talk communication can be performed as it is from the polling communication state, it is an effective means for improving the service. (Embodiment 7) FIG. 16 is a conceptual explanatory view of a mobile communication system according to Embodiment 7 of the present invention. This mobile communication system differs from the mobile communication system of Embodiment 6 shown in FIG.
The mobile station A is provided with an addressing press talk receiving means 19 instead of the press talk receiving means 15, and each of the mobile stations B to D on the receiving side is provided with an address specifying press talk requesting means 20 instead of the press talk requesting means 16. The point is. The address designation press talk requesting means 20
The mobile station A that has requested the paging is sent to each of the mobile stations B to D on the receiving side.
In the case of performing broadcast transmission from the mobile stations B to D on the receiving side while maintaining the polling state between the polling request and the broadcast signal b including the control information of the polling request, By setting the control information and the broadcast data in a reply signal c as a press talk request signal and transmitting the reply signal, a request for a press talk is made to the mobile station A on the general call request side. The destination of the broadcast signal b is specified by setting the address information of a specific group among the mobile stations B to D as the control information in the reply signal c as the press talk request signal. That is, when transmitting the reply signal c as the press talk request signal, the address designation press talk requesting means 20 sets the address of the broadcast destination mobile station in the control area of the reply signal c as the address information of the broadcast destination. When the mobile station A on the general incoming call request side receives a request for press talk from the mobile stations B to D on the receiving side,
For each of the mobile stations B to D, the broadcast data stored in the reply signal c as the press talk request signal, the control information of the press talk reception, and the broadcast destination of the reply signal c as the press talk request signal The address information of the specific group of the mobile station is set as the broadcast signal b and broadcast. That is, the address designation press talk receiving means 19 stores the address of the broadcast destination mobile station designated as the broadcast destination address information in the control area of the reply signal c as the press talk request signal, and the broadcast signal b. It is set in the broadcast control area as the address information of the target wireless station.

Next, with regard to the operation of the mobile communication system, FIG. 17 shows a case where the broadcast state is shifted to the broadcast communication state by the press talk by the press talk request from the receiving side mobile station, and again becomes the polling state by the press talk off request.
This will be described with reference to the control sequence shown in FIG. This control sequence differs from the control sequence of the sixth embodiment shown in FIG. 15 in that an address of a broadcast destination at the time of a press talk request can be specified. When the mobile station D transmits the reply signal c as the press talk request signal, the address designation press talk request means 20 sets the address information of the broadcast destination in the control area. When the mobile station A receives the reply signal c as the press talk request signal, the address designation press talk receiving means 19 acquires the address set in the control area of the reply signal c, and receives the same as the press talk request signal. When the broadcast signal b is transmitted, the address is set as address information in the broadcast control area. When receiving the broadcast signal b as the press talk acceptance signal from the mobile station A, the mobile stations B to D on the receiving side set the target radio stations set in the broadcast control area of the broadcast signal b. The address information is referred to, and if it matches the own station, the information is taken in; if not, discarded. In this example, mobile station D sends “mobile stations A, C, and D” as broadcast destinations of the press talk request.
Is specified. For this reason, the non-designated mobile station B has discarded the broadcast signal b as the press talk acceptance signal.

As described above, the mobile station can be designated as it is from the polling communication state to perform the press talk communication, which is an effective means for improving the service. (Eighth Embodiment) FIG. 18 is a conceptual explanatory view of a mobile communication system according to an eighth embodiment of the present invention. The mobile station A has a one-to-one communication accepting means 22, and the mobile stations B to D have a one-to-one communication requesting means. 23 and a broadcast communication canceling means 24. The one-to-one communication requesting unit 23 sends the simultaneous incoming call to the mobile stations B to D on the receiving side while the mobile station A that has requested the simultaneous incoming call maintains the polling state between the mobile stations B to D on the receiving side. Is performed, the control information of the one-to-one communication request is sent to the mobile station A on the general call request side when the broadcast signal b as the polling request signal is received. A request for one-to-one communication is made by transmitting a reply signal c as a one-to-one communication request signal. That is, when there is a one-to-one communication request, the one-to-one communication request unit 23 transmits a return signal c as a one-to-one communication request signal instead of transmitting a return signal c as a polling response signal. At this time, “one-to-one communication request” is set as control type information in the control area of the reply signal c. The one-to-one communication accepting unit 22 is configured to transmit a broadcast signal including control information of one-to-one communication reception when the mobile station A on the simultaneous call request side receives a request for one-to-one communication from the mobile stations B to D on the receiving side. b, and transitions to the one-to-one communication state using the wireless channel used for the paging. That is, the one-to-one communication receiving means 22
Transmits a broadcast signal b as a one-to-one communication accepting signal when a one-to-one communication request is received. On this occasion,
“One-to-one communication acceptance” is set as control type information in the broadcast control area of the broadcast signal b. Broadcast communication cancellation means 2
No. 4 returns the mobile stations other than the mobile station performing the one-to-one communication among the mobile stations B to D on the receiving side to the control for again waiting for an incoming call from another mobile station. That is, when each mobile station that does not perform one-to-one communication receives the broadcast signal b as a one-to-one communication acceptance signal, the broadcast canceling means 24 returns to the initial incoming call monitoring state again.

Next, the operation of the above-mentioned mobile communication system is shown in FIG. 19 in a case where the mobile station on the receiving side shifts to a one-to-one communication state in response to a one-to-one communication request, while the other mobile stations return to the initial incoming call monitoring. This will be described with reference to a control sequence. The mobile station D that has received the polling request transmits a reply signal c as a one-to-one communication request signal, and the mobile station A that has received the reply signal c as the one-to-one communication request signal
Broadcasts the broadcast signal b as the one-to-one communication acceptance signal, whereby the mobile station A and the mobile station D shift to the one-to-one communication state. Further, while the mobile station A and the mobile station D shift to the one-to-one communication state, the other mobile stations B and C return to the initial incoming call monitoring state.

In each of the above-mentioned embodiments, at the time of simultaneous paging, the simultaneous paging control signal a is continuously transmitted to the mobile stations B to D on the receiving side during T1, which is a sufficient time to reach the broadcast standby state. However, instead of this, when the receiving-side mobile stations B to D enter a broadcast standby state,
It may be configured to return a response.

[0041]

As described above, according to the present invention, there is provided a mobile communication system in which a radio station can perform simultaneous paging to a plurality of other radio stations. A paging means for transmitting a paging control signal from a radio station requesting paging to a plurality of other radio stations by using one available radio channel among communication radio channels; Broadcast standby means for sequentially monitoring the radio channels and receiving a broadcast control signal from one radio channel, and thereafter receiving a broadcast signal from the radio station on the broadcast reception request side via the radio channel; Broadcast transmission means for transmitting a broadcast signal from a radio station on the simultaneous call requesting side via one radio channel, so that the radio station does not need to go through a base station using one radio channel for communication. It can be migrated to broadcast state. Therefore, even if the communication channel of the base station is not empty,
Broadcast communication can be performed between mobile stations, and effective use of a wireless channel can be achieved.

Also, when the broadcast transmission means of the radio station on the broadcast reception request side transmits a broadcast signal, the broadcast transmission data validity designation for designating validity / invalidity of data stored in the broadcast signal. Means is provided, and when each radio station on the receiving side receives a broadcast signal, if data is specified to be valid, data is acquired, and data is specified to be invalid. If the configuration is to discard the data,
You can specify whether the broadcast transmission data is valid or invalid.

Further, instead of the simultaneous call receiving means, the simultaneous call control is performed from a radio station requesting the simultaneous call to a plurality of other radio stations by using one available radio channel among a plurality of communication radio channels. A signal is transmitted, and at that time, the address information of a specific group among the wireless stations on the receiving side is set as control information in the general incoming call control signal, so that the addressing simultaneous incoming call specifying the wireless station to receive the general incoming call is performed. If means is provided, while controlling the broadcast state,
Since multiple addresses can be grouped and broadcasted only to a specific wireless station, the address can be specified in advance to various broadcast destination terminals such as facsimile machines and telephones. Can communicate.

In addition, instead of the simultaneous call receiving means, the simultaneous call control is performed from a radio station requesting the simultaneous call to another plurality of radio stations by using one available radio channel among a plurality of communication radio channels. A signal is transmitted. At this time, a specific service information among the services of each radio station on the receiving side is set in the general call control signal as control information, thereby specifying the radio station to receive the general broadcast. If means is provided, while controlling the broadcast state,
Since broadcast communication can be performed only to a radio station of a specific service, the service can be designated in advance to various broadcast destination terminals such as a facsimile apparatus and a telephone, and appropriate communication without errors can be performed.

Further, when the radio station that has requested the simultaneous call reception maintains the broadcast communication state with each of the radio stations on the receiving side, it transmits a broadcast signal including control information of the polling request. A polling request means for sequentially polling each radio station; and a polling response for returning a polling response signal when each receiving radio station receives a broadcast signal containing control information of the polling request. Means, polling communication can be performed as it is from the broadcast communication state, which is an effective means for improving services.

In place of the polling request means, the control information of the polling request is transmitted when the radio station requesting the simultaneous call maintains the broadcast communication state with each radio station on the receiving side. By transmitting the broadcast signal including, at that time, by managing the address of the radio station to be polled, if there is provided a radio station designation polling request means for sequentially polling only radio stations of a specific group, Since the polling communication can be performed by directly specifying the wireless station from the broadcast communication state, this is an effective means for improving the service.

Further, while the radio station which has requested the simultaneous incoming call maintains the polling state with each of the called side radio stations,
When performing broadcast transmission from the receiving-side radio station, when a broadcast signal including control information of a polling request is received,
Press talk request means for making a press talk request to a radio station on the general call request side by setting the control information and broadcast data of the press talk request in the press talk request signal and transmitting the same, and a general call request When the wireless station on the receiving side receives a request for press talk from the wireless station on the receiving side, the broadcast data stored in the press talk request signal and the control information for accepting the press talk are broadcast to each wireless station. Press talk receiving means for setting and transmitting to a communication signal,
When the receiving-side radio station that has made the request for the press talk cancels the press talk request, the control information and data of the press talk off request are set in the press talk off signal and transmitted, so that each radio station is again set. And a press-talk-off requesting means for making the polling state possible, the press-talk communication can be performed as it is from the polling communication state, which is an effective means for improving the service.

Also, in place of the press talk request means,
A broadcast signal containing control information of a polling request when a radio station that has requested simultaneous paging performs broadcast transmission from a radio station on the called side while maintaining a polling state with each radio station on the called side. , The control information and broadcast data of the press-talk request are set in the press-talk request signal and transmitted, thereby requesting a press-talk requesting wireless station to perform a press-talk. And an addressing press-talk requesting means for designating a transmission destination of a broadcast signal by setting address information of a specific group among broadcast radio stations to control information of a press-talk request signal. Instead of the accepting means, when the simultaneous call requesting wireless station receives the request for the press talk of the receiving wireless station, the request is stored in the press talk request signal for each wireless station. The addressing press which sets the broadcast data, the control information of the press talk reception, and the address information of the specific group of the radio station of the broadcast destination of the press talk request signal as the broadcast signal and transmits the broadcast signal. If the talk accepting means is provided, the address can be directly specified from the polling communication state to perform the press talk communication, which is an effective means for improving the service.

Further, while maintaining the polling state between the radio stations requesting simultaneous paging and the radio stations on the receiving side,
When the receiving-side radio station performs one-to-one communication with the radio station that has requested the general paging, the control information of the one-to-one communication request is transmitted to the general paging request-side radio station when the polling request signal is received. By transmitting a one-to-one communication request signal including a one-to-one communication requesting means for requesting one-to-one communication, and a case where the simultaneous incoming requesting wireless station receives a one-to-one communication request of the receiving side wireless station. A one-to-one communication receiving means for transmitting a broadcast signal including control information for one-to-one communication reception, and transitioning to a one-to-one communication state using the wireless channel used for the simultaneous incoming call, Broadcast canceling means for returning a wireless station other than the wireless station performing one-to-one communication to control to wait for an incoming call from another wireless station again, One-to-one communication is possible, An effective means in achieving bis improved.

[Brief description of the drawings]

FIG. 1 is a conceptual explanatory diagram of a mobile communication system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a data configuration of a simultaneous incoming call control signal.

FIG. 3 is a schematic diagram showing a data structure of a broadcast signal.

FIG. 4 is a control sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention.

FIG. 5 is a conceptual explanatory diagram of a mobile communication system according to a second embodiment of the present invention.

FIG. 6 is a control sequence diagram illustrating an operation of the mobile communication system according to the second embodiment of the present invention.

FIG. 7 is a conceptual explanatory diagram of a mobile communication system according to a third embodiment of the present invention.

FIG. 8 is a control sequence diagram illustrating an operation of the mobile communication system according to the third embodiment of the present invention.

FIG. 9 is a conceptual explanatory diagram of a mobile communication system according to a fourth embodiment of the present invention.

FIG. 10 is a schematic diagram showing a data structure of a reply signal.

FIG. 11 is a control sequence diagram illustrating an operation of the mobile communication system according to the fourth embodiment of the present invention.

FIG. 12 is a conceptual explanatory diagram of a mobile communication system according to a fifth embodiment of the present invention.

FIG. 13 is a control sequence diagram illustrating an operation of the mobile communication system according to the fifth embodiment of the present invention.

FIG. 14 is a conceptual explanatory diagram of a mobile communication system according to a sixth embodiment of the present invention.

FIG. 15 is a control sequence diagram illustrating an operation of the mobile communication system according to the sixth embodiment of the present invention.

FIG. 16 is a conceptual explanatory diagram of a mobile communication system according to a seventh embodiment of the present invention.

FIG. 17 is a control sequence diagram illustrating an operation of the mobile communication system according to the seventh embodiment of the present invention.

FIG. 18 is a conceptual explanatory diagram of a mobile communication system according to an eighth embodiment of the present invention.

FIG. 19 is a control sequence diagram illustrating an operation of the mobile communication system according to the eighth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Broadcasting means 2 Broadcasting transmitting means 3 Broadcasting transmission data valid specifying means 4 Broadcasting waiting means 6 Address specifying simultaneous receiving means 8 Service specifying simultaneous receiving means 10 Polling request means 11 Polling response means 13 Radio station specifying polling requesting means 15 Press talk receiving means 16 Press talk request means 17 Press talk off request means 19 Address specifying press talk receiving means 20 Address specifying press talk request means 22 One-to-one communication receiving means 23 One-to-one communication request means 24 Broadcast communication canceling means

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-213933 (JP, A) JP-A-4-342345 (JP, A) JP-A-7-66776 (JP, A)

Claims (7)

(57) [Claims] 1. A mobile communication system in which a radio station can perform simultaneous paging to a plurality of other radio stations, wherein each radio station has one of a plurality of available radio channels for communication. A paging means for transmitting a paging control signal from a radio station requesting paging to a plurality of other radio stations by using one radio channel, and each radio station on the receiving side sequentially monitors the radio channel;
Broadcast receiving means for receiving a broadcast signal from a radio station on the side of the general call request after receiving the general call control signal on one of the radio channels; A broadcast transmitting means for transmitting a broadcast signal over two radio channels; and a broadcast transmitting means for transmitting a broadcast signal when the broadcast transmitting means of the broadcast requesting wireless station transmits the broadcast signal. A broadcast transmission data validity designation unit for designating validity / invalidity, and when each receiving station receives the broadcast signal, if the data is designated to be valid, the data is transmitted. A mobile communication system characterized in that it is configured to acquire and discard data when it is specified that the data is invalid. 2. A mobile communication system in which a radio station can simultaneously call another plurality of radio stations, wherein each radio station has one of a plurality of available communication radio channels. One radio channel transmits a general call control signal from the radio station requesting the general call to multiple other radio stations, and at that time, controls specific service information among the services of each radio station on the receiving side By setting the general incoming call control signal as information, a service specifying general incoming call means for specifying the radio station to receive the general incoming call, and each of the receiving side wireless stations sequentially monitors the radio channel.
Broadcast receiving means for receiving a broadcast signal from a radio station on the side of the general call request after receiving the general call control signal on one of the radio channels; A mobile communication system, comprising: a broadcast transmitting unit configured to transmit a broadcast signal using one wireless channel. 3. A mobile communication system in which a radio station can simultaneously call another plurality of radio stations, wherein each radio station has one of a plurality of available radio channels for communication. A paging means for transmitting a paging control signal from a radio station requesting paging to a plurality of other radio stations by using one radio channel, and each radio station on the receiving side sequentially monitors the radio channel;
Broadcast receiving means for receiving a broadcast signal from a radio station on the side of the general call request after receiving the general call control signal on one of the radio channels; A broadcast transmitting means for transmitting a broadcast signal through one radio channel; and a polling method when a radio station requesting a simultaneous call maintains a broadcast state with each radio station on the called side. Polling request means for sequentially polling each wireless station by transmitting a broadcast signal including control information of the request; and a broadcast signal including control information of the polling request by each of the receiving-side wireless stations. And a polling response unit that returns a polling response signal when receiving the mobile communication system. 4. The control information of a polling request is transmitted when a radio station that has requested simultaneous paging is in a state of maintaining a broadcast communication state with each radio station on the receiving side instead of the polling request means. By transmitting the broadcast signal including, at that time, by managing the address of the radio station to be polled,
4. The mobile communication system according to claim 3, further comprising wireless station designation polling request means for sequentially polling only a specific group of wireless stations. 5. When a radio station that has requested simultaneous paging performs broadcast transmission from a radio station on the receiving side while maintaining a polling state with each radio station on the receiving side, control information of the polling request is transmitted. When receiving a broadcast signal including the broadcast signal, the control information of the press talk request and the broadcast data are set in the press talk request signal and transmitted, thereby requesting the radio station on the simultaneous call request side to perform a press talk request. A press-talk requesting means for performing, when the radio station on the simultaneous call requesting side receives a request for press talk from the radio station on the receiving side, the same information stored in the press-talk request signal for each radio station. Press talk receiving means for setting broadcast data and control information of press talk reception as a broadcast signal and transmitting the broadcast, and the receiving-side radio station requesting the press talk receives a press talk request. Press talk-off request means for setting each radio station to the polling state again by setting and transmitting the control information and data of the press talk-off request as a press talk-off signal when canceling The mobile communication system according to claim 3, wherein: 6. In place of the press-talk requesting means, a radio station that has requested simultaneous paging performs broadcast transmission from a radio station on the receiving side while maintaining a polling state with each radio station on the receiving side. In this case, when a broadcast signal including the polling request control information is received, the control information of the press talk request and the broadcast data are set in the press talk request signal and transmitted, so that the broadcast reception request side wireless communication is performed. A request for a press talk is made to the station. At this time, the address information of a specific group among the radio stations of the broadcast destination is set in the control information of the press talk request signal, whereby the transmission destination of the broadcast signal is transmitted. Is provided, and instead of the press-talk receiving means, the radio station on the simultaneous call request side receives the press-talk request from the radio station on the called side. In this case, the broadcast data stored in the press talk request signal for each wireless station, the control information of the press talk reception, and the address of a specific group of the wireless station to which the press talk request signal is broadcast 6. The mobile communication system according to claim 5, further comprising an addressing press-talk receiving means for setting information and a broadcast signal and transmitting the broadcast signal. 7. A one-to-one communication between a radio station requesting a general call and a radio station requesting a general call while a radio station requesting a general call maintains a polling state with each radio station on the call reception side. When a polling request signal is received, a request for one-to-one communication is made by transmitting a one-to-one communication request signal including control information of a one-to-one communication request to a radio station on the general incoming call request side. A one-to-one communication requesting means, and when the simultaneous call requesting wireless station receives a request for one-to-one communication of the called-side wireless station, transmits a broadcast signal including control information of one-to-one communication reception. A one-to-one communication accepting means for transitioning to a one-to-one communication state using the wireless channel used for the simultaneous incoming call; and Return control to wait for incoming call from station The mobile communication system according to claim 3, characterized in that it comprises a broadcasting releasing means.