JP2000115071A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication system which can provide broadcasting communication service in a limited area at arbitrary time at an autonomous request from an unspecified mobile station. SOLUTION: This mobile communication system allows the mobile station 40 to send a broadcasting communication request to an exchange 50 through a base station 10 in a communication service area S under control by itself and the exchange 50 instructs the mobile station 40 to switch the broadcasting channel to a base station 20 for broadcasting communication by a channel switching indicating means at the broadcasting communication request. The base station 20 for broadcasting communication which installs a broadcasting communication area 21 for the broadcasting communication in a specific communication service area S by the base station 10 supports the broadcasting communication with the mobiles station 40 and controls only a down broadcasting channel for the mobile station 40. The mobile station 40 after acquiring the down broadcasting channel performs only reception which does not require a link of an up channel and receives broadcasted data from a data base 60 for the broadcasting communication base station.

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 for performing a broadcast communication mainly by switching a communication connection between a base station and a mobile station in an exchange.

[0002]

2. Description of the Related Art Conventionally, as a well-known technique related to this type of mobile communication system, for example, Japanese Patent Application Laid-Open No. 63-5252
Japanese Patent Laid-Open No. 6-247029 discloses a broadcast system of a mobile telephone system and a mobile communication system disclosed in Japanese Patent Laid-Open No. 3-247029.

In these mobile communication systems, in order to instruct a mobile station to start broadcasting, a switching to a radio broadcasting channel is instructed using a broadcast mode switching request signal or a broadcast signal.

Incidentally, as other well-known techniques related to general mobile communication, for example, Japanese Patent Laid-Open No. 7-16295
Japanese Patent Application Laid-open No. 9-2457 discloses a mobile radio device disclosed in
No. 85 gazette and the like.

[0005]

In the mobile communication system described above, the broadcast receiving from the base station is assumed to be limited to a temporary time only and the broadcast receiving terminal is set to the specific terminal. Due to the limitation, it is a function to simultaneously broadcast the switching instruction to the broadcast channel to the mobile station from the base station at the same time, and it is not possible to carry out broadcast communication from an unspecified mobile station voluntarily There is a problem.

[0006] In the case of the conventional mobile communication system, temporary or permanent broadcast in a specific area cannot be easily installed. However, there is an inconvenience that a broadcast communication service cannot be provided in a limited area as described above.

The present invention has been made to solve such a problem, and its technical problem is that a specific limited area specified at an arbitrary time according to a voluntary request from an unspecified mobile station. To provide a mobile communication system capable of providing a broadcast service.

[0008]

According to the present invention, a base station for setting a communication service area under its jurisdiction and a specific broadcast communication area set in the communication service area of the base station are set as cover areas. A broadcast base station, a broadcast base station database storing broadcast data, and a mobile station having a broadcast switching function existing in the broadcast area;
The base station, the broadcast base station, and the broadcast base station database are constituted by an exchange communicably connected, and the exchange is configured to perform the broadcast in response to a broadcast request from the mobile station. Means for transferring the requested broadcast data registered in the broadcast base station database to the broadcast channel of the broadcast base station, and transmitting to the mobile station in response to a broadcast request from the mobile station. Channel switching instructing means for instructing a broadcast channel of the broadcast base station to perform channel switching, wherein the broadcast base station captures the mobile station that has switched the channel to the broadcast channel, and performs communication. Broadcast support means for connecting to the mobile station, wherein the mobile station receives request broadcast data registered in the broadcast base station database through a broadcast channel of the broadcast base station. Mobile communication system comprising is obtained.

Further, according to the present invention, there is provided a mobile communication system in which the mobile station operates as a reception-only terminal that does not require an uplink channel link after capturing a downlink broadcast channel from the broadcast base station. can get.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile communication system according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a basic configuration of a mobile communication system according to one embodiment of the present invention.

In this mobile communication system, a plurality of (here, seven) base stations 10 having a communication service area S under its jurisdiction and a specific broadcast communication area 21 installed in the communication service area S are used simultaneously. A mobile station 40 having a broadcast switching function for performing broadcast communication, and a broadcast base station 20 for setting up a broadcast area 21 and supporting broadcast communication with the mobile station 40. And a base information confirming means for confirming information of the communicable base station 10 or the broadcast base station 20 so that the base station 10 or the broadcast base station 20 and the mobile station 40 A channel switch instructing unit for performing communication connection exchange and instructing the mobile station 40 to switch the broadcast channel to the broadcast base station 20 in response to a broadcast request from the communicable mobile station 40; Exchange 50 and broadcast It consists broadcast base station database 60 for accumulated broadcast data for.

The broadcast base station 20, which supports broadcast, is communicably connected to the exchange 50 together with the other base stations 10, and the exchange 50 is connected to the base station 2 for broadcast.
0, a broadcast base station database 60 storing broadcast data for performing broadcast communication is communicably connected.

That is, in this mobile communication system, the mobile station 40 is in the base station 1 in the communication service area S under its control.
, A broadcast request is sent to the exchange 50 via the
At 0, the channel switching instructing means instructs the mobile station 40 to switch to the broadcasting base station 20 in response to the broadcasting request to the broadcasting station. The broadcast base station 20 that establishes a specific broadcast area 21 for performing the broadcast within the communication service area S by the base station 10 supports the broadcast communication with the mobile station 40. The mobile station 40 controls only the downlink broadcast channel. After capturing the downlink broadcast channel, the mobile station 40 having the broadcast switching function becomes reception-only without requiring an uplink channel link, and receives broadcast data from the broadcast base station database 60.

FIG. 2 is a block diagram showing a detailed configuration of the exchange 50. The exchange 50 receives a communication request or a broadcast request from the mobile station 40, and determines whether a service or a broadcast service included in the request signal is registered or not. A checking unit 52 and a plurality of registration service control units 5 which are provided for each requested service, hold a list of base station related information, and transmit the base station related information according to the result of the registration confirmation determination.
3 and a base station capture confirming unit 5 that determines whether or not the requesting mobile station 40 is in a state capable of receiving based on the base station related information.
And a central processing unit 51 that performs data processing in each of these units and sends an instruction to the corresponding base station so that the requesting mobile station 40 shifts to a downlink channel according to the result of the state determination.

That is, when the exchange 50 receives the broadcast request and the registration service confirmation unit 52 confirms the registration of the broadcast service, the base station which broadcasts the requested broadcast service. The registration service control unit 53 holding the list of related information transfers the base station related information to the base station acquisition and confirmation unit 54. Therefore, the base station capture confirming unit 54 determines whether the requesting mobile station 40 is in a state where it can perform broadcast reception together with the current capturing base station information transmitted from the requesting mobile station 40. If it is possible to shift to the broadcast reception but it is confirmed, the central processing unit 51 sends the broadcast base station 20 to the base station 10 corresponding to the determination result in response to the broadcast request from the requesting mobile station 40. Is transmitted to shift to a downlink broadcast channel. The requesting mobile station 40 that has received the instruction of the downlink broadcast channel by the broadcast base station 20 operates as a reception-only terminal after capturing the downlink broadcast channel, and as a result, becomes a reception-only terminal after receiving the broadcast service. Will work.

Therefore, the registration service control unit 5 here
3. The base station capture confirmation unit 54 and the central processing unit 51
In addition, it functions as the above-described channel switching instruction means.

Hereinafter, the operation of the mobile communication system will be specifically described with reference to a flowchart showing the operation processing of the exchange 50 shown in FIG.

In the mobile communication system, first, the mobile station 4 having a broadcast switching function (downlink broadcast service switching function).
0 transmits a request signal indicating the requested broadcast service to the base station 10 to receive the broadcast service, and the request signal is transmitted to the exchange 50 via the base station 10.

As a result, the operation process is started in the exchange 50, and the transmitted request signal is transferred to the registration service confirmation unit 52 via the central processing unit 51. The registration service confirmation unit 52 shifts to a process of confirming that the requested broadcast service is registered in the communication network (step S1), and specifically determines whether or not the request is registered (step S1).
2) Then, the determination result is notified to the central processing unit 51.

If the determination result does not indicate registration, the central processing unit 51 sends a service provision addition message to the requesting mobile station 40 (step S4) and terminates the processing, but the determination result indicates registration. If so, the base station and channel information are transmitted to the base station acquisition and confirmation unit for the corresponding one of the registered service control units 53 holding the base station related information including the broadcast information prepared for each registration service. 54
To be forwarded to. Thereby, the base station capture confirming unit 54 combines the base station and channel information, which are the base station related information transmitted from the registration service control unit 53, with the current captured base station information transmitted from the requesting mobile station 40. Checking whether the requesting mobile station 40 is in a state capable of receiving broadcasts is performed as checking whether or not the supporting base station (broadcasting base station 20) can be supplemented (step S3). Specifically, the broadcast base station 20 is checked. Determines whether the requesting mobile station 40 can be supplemented (step S5), and compares the determination result with the central processing unit 51.
Notify to

If the determination result indicates that supplementation is not possible, the central processing unit 51 sends a message to the effect that the mobile station 40 is out of the service area to the requesting mobile station 40 (step S7), and ends the processing. Indicates that supplementation is permitted, the requesting mobile station 40 is instructed to switch from the current channel ch to the channel ch of the support base station (broadcasting base station 20) (step S6), and then the processing is performed. finish. That is, if the determination result indicates that supplementation is possible, the central processing unit 51 sends an instruction to the requesting mobile station 40 to shift to the downlink broadcast channel of the corresponding broadcast base station 20. Will do. The requesting mobile station 40 that has received the instruction to shift to the downlink broadcast channel from the broadcast base station 20 operates as a reception-only terminal after capturing the downlink broadcast channel, and does not use the uplink channel.

In the above-described mobile communication system, the broadcast base station database 60 not only has broadcast data stored in advance, but also can be connected to, for example, an audio broadcasting apparatus. It is. The exchange 50 and the base station 10 can be configured not only in conformity with the digital car telephone system standard (RCR STD-27D), but also in the second generation cordless telephone system standard (RCR STD-27D). 2
8).

FIG. 4 is a block diagram showing a basic configuration of a digital car telephone system to which the above-mentioned mobile communication system is applied.

In this digital car telephone system, an event venue 80 for performing broadcast communication is set.
An event venue base station 81 which works in the same manner as the broadcast base station 20 is installed as a base station for covering the base station. The base station 81 for the event site is installed when the event is held and is used for removal at the end of the event, or is permanently installed as a fixed facility in the case of a permanent event. It is connected.

The exchange 50 includes an event venue base station 8.
1 is connected to an event base station database 90 (which works in the same manner as the above-mentioned broadcast base station database 60) in which broadcast data to be broadcasted through the server 1 is stored in advance.

The exchange 50 has the same configuration as that shown in FIG. 2 as well as the components as a digital car telephone system.

The mobile station 40 here also has a downlink broadcast service switching function similar to that shown in FIG.
In the cover area (communication service area S), a normal call can be made.

In this digital car telephone system, the carrier of the mobile station 40 moves into the event venue 80 and tries to receive the broadcast service provided at the event venue 80, and the mobile station 40 receives the broadcast. Enter the command corresponding to the service. It is assumed that the requested broadcast service is, for example, “event voice guidance”. Therefore, mobile station 4
0 transmits a broadcast service request signal, and the request signal is received by the mobile station 40 and the normal base station 10 assigned as a base station to be linked to both the uplink and downlink channels. The received request signal is transmitted to the exchange 50 via the base station 10.

The transmitted request signal is transferred to the registration service confirmation unit 52 via the central processing unit 51 in the exchange 50. The registration service confirmation unit 52 recognizes that the broadcast of “event voice guidance” is requested in the request signal, and the requested broadcast service “event voice guidance” is registered in the communication network. The registration service confirmation unit 52 accesses the system data and confirms whether or not the system data exists. As a result of the confirmation, the central processing unit 51 that recognizes that the “event voice guidance” has been registered provides this service to the registration service control unit 53 corresponding to the “event voice guidance” broadcast service. An instruction is issued to transfer the broadcast base station and channel information to the base station capture confirming unit 54.

The base station capture confirming section 54 combines the data transmitted from the registration service control section 53 with the current capture base station information of the request mobile station 40 already transmitted from the request mobile station 40 to perform the request movement. It is determined whether or not the station 40 is ready to broadcast.

In this case, since the requesting mobile station 40 is already in the coverage area of the event venue base station 81,
The downlink channel of the broadcast base station 81 performing the “event voice guidance” broadcast service is included in the acquired base station information transmitted from the requesting base station 40. Therefore, the base station capture confirming unit 54 determines that the requesting mobile station 40 is in a state capable of receiving broadcasts, and notifies the central processing unit 51 of that. The central processing unit 51 sends an instruction to the requesting mobile station 40 so as to switch to the downlink broadcast channel of the event site base station 81 corresponding to the determination result.

The requesting mobile station 40, which has received the instruction to shift to the downlink broadcast channel, shifts to the downlink broadcast channel and receives the "event voice guidance" broadcast service. Thereafter, the requesting mobile station 40 operates as a reception-only terminal, and performs only downlink channel reception without using an uplink channel.

In this digital car telephone system, the event base station database 90 can be configured to connect not only broadcast data stored in advance but also a live audio broadcasting device.

FIG. 5 is a block diagram showing a basic configuration of a modification of the digital car telephone system shown in FIG.

This digital car telephone system is shown in FIG.
The configuration and function are substantially the same as those shown in FIG. 2, but the point that the event-only down-link base station 82 and the exchange 50 are not connected and the event base station database 90 is It is different from the above in that it is not connected to the event venue downlink dedicated base station 82 via the downlink dedicated base station control device 83.

In this case, since the mobile station 40 having the downlink broadcast service switching function does not perform the uplink communication after the start of the reception of the broadcast service, the mobile station 40 dare to transmit the downlink broadcast service information.
It is configured to directly transmit to the event venue downlink dedicated base station 82 without transmitting from 0. However, since the event base station database 90 cannot be directly connected to the event site down-only base station 82 as it is,
A downlink-dedicated base station control device 83 for executing part of the functions of the exchange 50 is connected between the event venue-dedicated downlink base station 82 and the event base station database 90.

In the case of the digital car telephone system having such a configuration, necessary facilities for performing the broadcast service at the event venue 80 are installed at the event venue 80,
Since the broadcast device is configured without the need to connect to the exchange 50 with a dedicated line or the like, the convenience and economy in actual installation of the equipment can be significantly improved.

[0039]

As described above, according to the mobile communication system of the present invention, the broadcast service reception is not provided by the unidirectional instruction of the broadcast information providing side, but the broadcast service from the unspecified mobile station is provided. It is possible to receive services by broadcast at a specific time at a specified time according to voluntary requests, and it is possible to temporarily or always broadcast services in a specific area as a general mobile communication system Becomes

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a mobile communication system according to one embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of an exchange provided in the mobile communication system shown in FIG.

FIG. 3 is a flowchart showing an operation process of the exchange shown in FIG. 2;

FIG. 4 is a block diagram showing a basic configuration of a digital car telephone system to which the mobile communication system shown in FIG. 1 is applied.

FIG. 5 is a block diagram showing a basic configuration of a modification of the digital car telephone system shown in FIG.

[Explanation of symbols]

 Reference Signs List 10 base station constituting mobile communication system 20 base station supporting broadcast communication 21 broadcast area 40 mobile station having downlink broadcast service switching function 50 exchange 51 central processing unit 52 registration service confirmation unit 53 registration service control Unit 54 base station capture confirming unit 60 broadcast base station database 80 event venue for performing broadcast 81 base station for event venue 82 downlink-only base station for event venue 83 downlink-only base station control device 90 for event base station Database S Communication service area

Claims (2)

[Claims] 1. A base station having a communication service area under its jurisdiction, a broadcast base station having a specific broadcast communication area installed in the communication service area of the base station, and a broadcast. A broadcast base station database storing data, a mobile station having a broadcast switching function existing in a broadcast area, the base station, the broadcast base station, and the broadcast base station. The mobile station comprises an exchange communicably connected to the database, and the exchange sends request broadcast data registered in the broadcast base station database in response to a broadcast request from the mobile station. Means for transferring to the broadcast channel of the communication base station, and a channel for instructing the mobile station to switch the channel to the broadcast channel of the broadcast base station in response to a broadcast request from the mobile station Switching instruction Means, the broadcast base station comprises communication support means for capturing the mobile station that has switched the channel to a broadcast channel, and communicatively connecting the mobile station, wherein the mobile station comprises the broadcast base station. A mobile communication system, comprising: a broadcast communication unit that receives request broadcast data registered in the broadcast base station database through the broadcast channel. 2. The mobile station according to claim 1, wherein the mobile station operates as a reception-only terminal that does not require an uplink channel link after acquiring a downlink broadcast channel from the broadcast base station. Body communication system.