JP2009267798A - Mobile communication system, broadcast distribution system and communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a reception rate of broadcast distribution of a communication terminal without inducing congestion. <P>SOLUTION: In a broadcast distribution system 10 included in a mobile communication system 100, broadcast distribution of broadcast information containing an identifier is performed to a plurality of communication terminals 60 by a broadcast distribution section 11, each of the communication terminals 60 is notified of the identifier of distributed broadcast information via a notification channel. The communication terminal 60 holds the identifier of distributed broadcast information in a received identifier holding section 62, compares the identifier with the distributed information identifier advised via the notification channel and transmits to the broadcast distribution system 10 an individual distribution request containing the identifier of broadcast information that has not been received yet on a side of the communication terminal 60. A broadcast information individual distribution section 14 of the broadcast distribution system 10 individually distributes to the communication terminal 60, broadcast information specified by the identifier contained in the individual distribution request received in a distribution request receiving section 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mobile communication system, a broadcast distribution system and a communication terminal constituting the mobile communication system.

  In conventional wireless communication, as one of broadcast distribution systems, there is a method in which information having the same contents is broadcast from a wireless base station control device to communication terminals under the control of the wireless base station. In this broadcast distribution, since it is necessary to efficiently distribute information to a large number of communication terminals, distribution is performed simultaneously using the same wireless channel (common channel).

  However, at the time when broadcast distribution is performed, if the communication terminal to be distributed is using an individual channel for communication such as a call or web access, or if it is out of service area, Cannot get broadcasted information.

  In addition, the radio base station controller does not manage the distribution status of each broadcast distribution to each communication terminal. Therefore, the communication terminal that cannot properly receive the broadcast distribution cannot be grasped, and the broadcast distribution information is not retransmitted to the communication terminal. There is a problem that is low.

On the other hand, in Patent Document 1, the control station notifies the communication terminal of information for prompting location registration after performing broadcast distribution, and when the communication terminal performs location registration corresponding thereto, the communication is performed. A method is disclosed in which the control station confirms whether the communication terminal has received broadcast information that has been broadcast distributed by transmitting information on the broadcast information acquired by the terminal to the control station via the base station. .
JP 2007-214893 A

  As described above, according to the method described in Patent Document 1, since it is possible to confirm reception of broadcast information on the control station side, a search is made for a communication terminal that has not received distributed broadcast information and It is considered possible to retransmit the broadcast information to the communication terminal.

  However, the reception confirmation method described in Patent Document 1 has the following problems. In other words, since the communication terminal tries to perform location registration in response to information prompting location registration notified for the purpose of confirmation of reception by the control station, an unspecified number of communication terminals under the control of the base station are simultaneously sent to the control station. Information about receipt confirmation is transmitted, and congestion may be induced.

  The present invention has been made in view of the above, and a mobile communication system capable of increasing the broadcast distribution reception rate of a communication terminal without inducing congestion, and a broadcast distribution system constituting the mobile communication system, and An object is to provide a communication terminal.

  In order to achieve the above object, a mobile communication system according to the present invention includes a plurality of communication terminals that communicate by connecting to a mobile communication network, and broadcast to the plurality of communication terminals via the mobile communication network. A broadcast communication system including a broadcast distribution system for distributing information, wherein the broadcast distribution system performs broadcast distribution of broadcast information having an identifier to a plurality of communication terminals. Broadcast distribution means, distributed identifier holding means for holding the distributed broadcast information distributed by the broadcast distribution means, and the identifier of the distributed broadcast information in association with each other, and holding the distributed identifier Means for notifying a plurality of communication terminals through a broadcast channel of an identifier of distributed broadcast information held by the means, and broadcast information having an identifier of distributed broadcast information transmitted from the communication terminal. Receive individual delivery request The distribution request receiving means, and the identifier of the distributed broadcast information included in the individual distribution request received by the distribution request receiving means, and the identifier held by the distributed identifier holding means for the communication terminal Broadcast information individual distribution means for performing individual distribution of distributed broadcast information having a communication information, and the communication terminal receives the broadcast information having an identifier that is broadcast from the broadcast distribution system. Means, a received identifier holding means for holding an identifier of broadcast information received by the broadcast information receiving means, and a distribution completed for acquiring an identifier of distributed broadcast information notified through a broadcast channel from the broadcast distribution system Refer to the identifier of the broadcast information held by the identifier acquisition means, the received identifier holding means, and the identifier of the broadcast information acquired by the distributed identifier acquisition means. When there is an identifier that is not held in the received identifier holding means in the identifier of information, a distribution request transmitting means for transmitting a distribution request for distributed broadcast information having the identifier to the broadcast distribution system, and a distribution request transmitting means And a separate distribution receiving means for receiving distributed broadcast information distributed individually from the broadcast distribution system in response to transmission of a distribution request by.

  In the above mobile communication system, the identifier associated with the broadcast information broadcasted to a plurality of communication terminals by the broadcast delivery system is held by the delivered identifier holding means and communicated through the broadcast channel. Notified to the terminal. Thereby, it is possible to grasp the broadcast information on which the broadcast distribution is performed on the communication terminal side, and at the same time, it is possible to determine whether or not the communication terminal is receiving them. Also, based on the result, the broadcast information that has not been received on the communication terminal side is transmitted to the broadcast distribution system as a distribution request, so that the corresponding broadcast information is individually distributed from the broadcast distribution system to the communication terminal. can do. At this time, the notification of the distributed broadcast information is performed via the broadcast channel. Further, communication performed for distributing broadcast information that has not been received on the communication terminal side is performed by individual communication between a communication terminal that has not received broadcast information and the broadcast distribution system. Therefore, since the increase in the amount of communication accompanying the delivery of broadcast information to communication terminals with unreceived broadcast information is small, it is possible to suppress the induction of congestion due to the above processing. In addition, communication information that has been individually distributed from a broadcast distribution system can be received by sending a distribution request to a communication terminal that has been unable to receive broadcast information during a call or the like. The broadcast information reception rate at the terminal can be increased.

  In addition to being described as an invention of a mobile communication system as described above, the present invention can also be described as an invention of a broadcast distribution system and a communication terminal as follows.

  That is, the broadcast distribution system according to the present invention is a broadcast distribution system that distributes broadcast information via a mobile communication network to a plurality of communication terminals that communicate by connecting to the mobile communication network. Broadcast delivery means for delivering broadcast information having an identifier to a plurality of communication terminals, delivered broadcast information delivered by broadcast delivery means, and the delivered broadcast information. Distribution identifier holding means for associating and holding an identifier of broadcast information, and a distributed identifier notification for notifying a plurality of communication terminals of the identifier of broadcast information held by the distribution identifier holding means through a broadcast channel Means, a distribution request receiving means for receiving an individual distribution request for broadcast information having an identifier of distributed broadcast information transmitted from a communication terminal, and a distribution completed in the individual distribution request received by the distribution request receiving means Broadcast information Broadcast information individual distribution means for performing individual distribution of distributed broadcast information having the identifier held by the distributed identifier holding means with reference to the identifier; .

  The communication terminal according to the present invention is a communication terminal that communicates by connecting to a mobile communication network, and broadcast information receiving means for receiving broadcast information having an identifier distributed from the broadcast distribution system; A received identifier holding means for holding an identifier of the broadcast information received by the broadcast information receiving means, a distributed identifier acquisition means for acquiring an identifier of the distributed broadcast information notified from the broadcast distribution system, Hold the received identifier in the identifier of the broadcast information that has been distributed with reference to the identifier of the broadcast information held by the received identifier holding means and the identifier of the broadcast information that has already been acquired acquired by the distributed identifier acquisition means. If there is an identifier not held by the means, a delivery request transmission means for sending a delivery request for delivered broadcast information having the identifier to the broadcast delivery system, and a delivery request by the delivery request sending means And dedicated transport receiving means for receiving the served broadcast information separately distributed from broadcast distribution system in accordance with the signal, characterized in that it comprises a.

  ADVANTAGE OF THE INVENTION According to this invention, the broadcast delivery system and communication terminal which comprise the mobile communication system which can raise the receiving rate of the broadcast delivery of a communication terminal, and the said mobile communication system, without inducing congestion are provided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a mobile communication system 100 according to a preferred embodiment of the present invention and their connection relationship. The mobile communication system 100 includes a mobile communication network 40 including a radio base station controller (RNC) 20 and a base station 30, and a broadcast distribution system 10 included in the mobile communication network 40. And a plurality of communication terminals 60A and 60B that connect to the mobile communication network 40 and perform mobile communication. The broadcast distribution system 10 is a system for distributing broadcast information to a plurality of communication terminals 60A and 60B. The base station 30 is a system that establishes wireless connection with a plurality of communication terminals 60 </ b> A and 60 </ b> B under its control, and the radio base station control device 20 is a device that controls the base station 30. Here, in FIG. 1, one radio base station control device 20 is connected to the broadcast distribution system 10 and one base station 30 is connected. Are connected to each other, and a plurality of base stations 30 are connected to each of the radio base station control devices 20, whereby a mobile communication network 40 is configured. Further, in FIG. 1, a communication terminal 60A and a communication terminal 60B are illustrated as an example in which there are a plurality of communication terminals 60.

  Note that the broadcast information distributed by the mobile communication system 100 is information that needs to be widely known to the communication terminals 60 that are in the area of the base station 30, for example, an abnormality occurs in the communication status. Notification of the area where the disaster occurs, and notification of the evacuation site when a disaster occurs. The broadcast information is not limited to a text sentence, and various data can be notified as the broadcast information. Here, the distribution of the broadcast information may be performed for each radio base station controller 20 or base station 30.

  In the mobile communication system 100 described above, the broadcast distribution system 10 and the radio base station controller 20 are connected to each other, and the radio base station controller 20 and the base station 30 are connected to each other via a wired network. . In addition, information is exchanged between the base station 30 and the communication terminals 60A and 60B by wireless communication.

  Next, details of each device included in the mobile communication system 100 will be described.

  The broadcast distribution system 10 is a system for performing broadcast distribution of broadcast information to the communication terminals 60A and 60B via the radio base station control device 20 and the base station 30. In FIG. 1, the broadcast distribution system 10 is configured to be included in the mobile communication network 40, but may be provided outside the mobile communication network 40, and the radio base station control device 20 and the base station What is necessary is just to be set as the structure which communicates via 30.

  As shown in FIG. 1, the broadcast distribution system 10 includes a broadcast distribution unit 11, a distributed identifier holding unit 12, a distribution request receiving unit 13, and a broadcast information individual distribution unit 14. The

  The broadcast delivery unit 11 functions as a broadcast delivery unit that broadcasts broadcast information assigned with an identifier to the communication terminals 60A and 60B. Specifically, the broadcast information to which the identifier and the retention time of the identifier after distribution are added is transmitted to the radio base station control device 20, and the communication terminal is transmitted together with the identifier assigned in association with the broadcast information. Broadcast distribution to the 60A and 60B via the common channel is instructed. Here, the identifier given to the broadcast information is an identifier for specifying the broadcast information. In addition, the identifier retention time after distribution is defined as the time for which the identifier is retained in a distributed identifier retaining unit 12 or a received identifier retaining unit 62 described later.

  Note that the common channel used for broadcast distribution is a channel used for broadcast distribution to a plurality of communication terminals. By performing distribution via this channel, for example, a specific base station Broadcast information can be collectively transmitted to a plurality of unspecified communication terminals located under 30.

  In addition, the broadcast distribution unit 11 has instructed the radio base station control device 20 to notify the plurality of communication terminals 60A and 60B under the base station 30 through the broadcast channel of an identifier for specifying the broadcast information. It functions as an identifier notification means. In the broadcast distribution system 10 according to the present embodiment, the notification instruction of the distributed identifier is performed simultaneously with the broadcast distribution instruction of the broadcast information. The identifier instructing the notification to the communication terminals 60A and 60B and the broadcast information associated with the identifier are sent from the broadcast distribution unit 11 to the distributed identifier holding unit 12.

  Here, the broadcast channel used when notifying the identifier of the distributed broadcast information is a channel for notifying the communication information including the control information from the base station 30 to the communication terminal 60, and the broadcast information is It is always sent at regular intervals. The communication terminal 60 can receive this broadcast information at any time through the broadcast channel.

  The distributed identifier holding unit 12 functions as a distributed identifier holding unit that holds the broadcast information sent from the distributed identifier notification unit 11 and its identifier in association with each other.

  The distribution request receiving unit 13 receives a distribution information individual distribution request transmitted from a specific communication terminal 60 among a plurality of communication terminals and information specifying the communication terminal 60 that has transmitted the individual distribution request. Functions as a request receiving means. The broadcast information individual distribution request received by the distribution request receiving unit 13 and the information on the communication terminal 60 are sent to the broadcast information individual distribution unit 14.

  The broadcast information individual distribution unit 14 individually transmits the distributed broadcast information to the communication terminal 60 based on the individual distribution request of the broadcast information sent from the distribution request receiving unit 13 and the information of the communication terminal 60. It functions as a broadcast information individual distribution means. Specifically, based on the individual distribution request for broadcast information, broadcast information having an identifier included in the individual distribution request is selected from among the broadcast information held in the distributed identifier holding unit 12. Then, the radio base station controller 20 is instructed to perform individual distribution of the broadcast information via the individual channel to the communication terminal 60 that has transmitted the individual distribution request.

  In addition, the individual channel used for performing individual distribution is when performing unicast distribution that transmits / receives to / from a specific communication terminal or multicast distribution that transmits / receives by specifying a plurality of specific communication terminals. The channel to use. The communication terminal 60 cannot use the dedicated channel and the common channel described above at the same time.

  The radio base station control device 20 has a function of controlling the base station 30 based on an instruction from the broadcast distribution system 10. Specifically, when broadcast delivery of broadcast information is instructed from the broadcast delivery system 10, the broadcast information is sent to the base station 30 and sent to the communication terminals 60 </ b> A and 60 </ b> B subordinate to the base station 30. Direct broadcast delivery. Further, based on the notification instruction of the distributed identifier that is instructed at the same time, the information on the identifier to be notified is sent to the base station 30 and the communication terminals 60A and 60B are instructed to notify through the broadcast channel. In addition, when an instruction to individually distribute information to a specific communication terminal 60 under the base station 30 is given from the broadcast distribution system 10, this information is sent to the base station 30 to instruct to perform individual distribution. To do.

  The radio base station controller 20 further has a function of sending information transmitted from the communication terminal 60 via the base station 30 to the broadcast distribution system 10. Specifically, when the communication terminal 60 transmits a broadcast information distribution request, the communication terminal 60 receives an individual distribution request for broadcast information sent from the base station 30 and information on the communication terminal 60 that is the transmission terminal of the request. These pieces of information are transmitted to the broadcast distribution system 10.

  The base station 30 has a function of communicating with a plurality of subordinate communication terminals 60A and 60B in accordance with instructions from the radio base station control device 20. Specifically, when an instruction to broadcast the broadcast information is given from the radio base station control device 20, the broadcast delivery is performed to the subordinate communication terminals 60A and 60B via the common channel. I do. In addition, when notification information is notified to the communication terminals 60A and 60B through the notification channel according to the instruction of the radio base station control device 20, at the same time, an instruction to notify the distributed identifier is received via this notification channel. The broadcast identifier is included in the broadcast information via the broadcast channel and notified to the communication terminals 60A and 60B. In addition, a function of transmitting / receiving information to / from a specific communication terminal among a plurality of subordinate communication terminals 60 via an individual channel is further provided, and information transmitted from the communication terminal 60 is transmitted via an individual channel. While transmitting to the radio base station control apparatus 20, it has the function to transmit the information transmitted from the radio base station control apparatus 20 to the specific communication terminal 60.

  As shown in FIG. 2, the broadcast distribution system 10, the radio base station control device 20, and the base station 30 described above include a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102 that is a main storage device, and The computer includes a ROM (Read Only Memory) 103, a communication module 104 for performing communication, and an auxiliary storage device 105 such as a hard disk. And when these components operate, each function of each device 10,20,30 mentioned above is exhibited.

  Next, the communication terminal 60 will be described. The communication terminal 60 is a device used by a user to connect to the mobile communication network 40 and perform wireless communication. Specifically, the communication terminal 60 is realized as a device having a communication function such as a mobile phone. As shown in FIG. 1, the communication terminal 60 includes a broadcast information receiving unit 61, a received identifier holding unit 62, a distributed identifier acquiring unit 63, a distribution request transmitting unit 64, an individual distribution receiving unit 65, It is comprised including.

  The broadcast information receiving unit 61 functions as a broadcast information receiving unit that receives broadcast information distributed from the broadcast distribution system 10 via the radio base station controller 20 and the base station 30. The broadcast information received by the broadcast information receiving unit 61 is notified to the user of the communication terminal 60 by displaying the contents on the display unit of the communication terminal 60. Further, the identifier assigned corresponding to the broadcast information is sent to the received identifier holding unit 62.

  The received identifier holding unit 62 functions as a received identifier holding unit that holds the identifier sent from the broadcast information receiving unit 61. The identifier held by the received identifier holding unit 62 is used as an identifier indicating the broadcast information that has already been received by the communication terminal 60 when compared with a distributed identifier acquired by a distributed identifier acquisition unit 63 described later. Used.

  The distributed identifier acquisition unit 63 acquires, from the broadcast distribution system 10, the identifier of the broadcast information already distributed from the broadcast information notified through the broadcast channel via the radio base station controller 20 and the base station 30. It functions as a distributed identifier acquisition means. The identifier of the distributed broadcast information acquired by the distributed identifier acquisition unit 63 is sent to the distribution request transmission unit 64 because it is used to identify the broadcast information that has not been received by the communication terminal 60.

  The distribution request transmission unit 64 refers to the identifier of the broadcast information held in the received identifier holding unit 62 and the identifier of the distributed broadcast information sent from the distribution identifier acquisition unit 63. When an identifier not held in the identifier holding unit 62 is included in the identifier of the distributed broadcast information, it functions as a distribution request transmission unit that transmits an individual distribution request for the broadcast information having the identifier to the broadcast distribution system 10 To do. That is, the distribution request transmission unit 64 compares the broadcast information not received by the communication terminal 60 with the identifier held in the received identifier holding unit 62 and the identifier acquired by the distributed identifier acquisition unit 63. Thus, the identifier associated with the broadcast information not received by the communication terminal 60 and the information specifying the communication terminal 60 are transmitted as an individual distribution request for the information.

  The individual distribution receiving unit 65 is individually distributed from the broadcast distribution system 10 through the radio base station control device 20 and the base station 30 through the individual channel based on the individual distribution request transmitted by the distribution request transmitting unit 64. It functions as individual distribution receiving means for receiving broadcast information. When the individual distribution receiving unit 65 receives the broadcast information individually distributed, the communication terminal 60 can receive the broadcast information.

  As illustrated in FIG. 3, the communication terminal 60 includes a CPU 601, a RAM 602, a ROM 603, an operation unit 604, a wireless communication unit 605, a display 606, and an antenna 607. When these components operate, the functions of the communication terminal 60 described above are exhibited.

  Next, the broadcast distribution process by the mobile communication system 100 according to the present embodiment will be described in detail with reference to the sequence diagram of FIG.

  In the sequence diagram of FIG. 4, when the broadcast distribution system 10 broadcasts broadcast information via the radio base station controller 20 and the base station 30, an individual channel is set by making a call with another communication terminal or the like. An example in which broadcast distribution is performed to the communication terminal 60A being used (S100) and the communication terminal 60B being in a standby (standby) state will be described. In addition to the case where the communication terminal 60 uses an individual channel, the broadcast information cannot be acquired when the broadcast information is distributed, such as when the communication terminal 60 is temporarily out of service area. In some cases, the same processing as that of the communication terminal 60A in FIG. 4 is performed.

  First, when distribution of broadcast information becomes necessary, the broadcast distribution system 10 creates broadcast information in the broadcast distribution unit 11 (S101). The broadcast information is created by inputting the broadcast information to be distributed by the administrator of the broadcast distribution system 10, or for example, when the broadcast distribution system 10 receives emergency earthquake information. It is created by automatically generating when the specified situation occurs. Further, when the broadcast information is created, an identifier corresponding to the broadcast information is given. The identifier given at this time is given to specify the broadcast information. Therefore, it is necessary to be independent for each piece of broadcast information transmitted from the broadcast distribution system 10, and for example, a three-digit number can be used. Further, the distribution identifier holding unit 12 of the broadcast distribution system 10 designates the time for holding the broadcast information and the identifier as necessary. In this case, the holding time can be designated according to the importance level and valid time of the broadcast information. When the holding time is not determined according to the importance level of the broadcast information, it is preferable that all the broadcast information is handled as the same holding time by setting the holding time to be uniform (for example, 6 hours). . The assignment of the identifier to the broadcast information to be distributed and the designation of the holding time can be performed by the administrator of the broadcast distribution system 10 inputting based on the contents of the broadcast information, etc. 10 can be set automatically.

  Next, the broadcast information and the identifier given in association with the broadcast information are broadcast to the communication terminals 60 (60A and 60B) under the base station 30. Specifically, the broadcast information and identifier to be broadcasted and the information on the retention time of the broadcast information, if set, are controlled from the broadcast delivery unit 11 of the broadcast delivery system 10 by the radio base station control. It is transmitted to the device 20 (S102a). In addition, the broadcast delivery unit 11 of the broadcast delivery system 10 transmits the identifier through the broadcast channel during the holding time set for the broadcast information (the effective time from the time when the broadcast delivery is performed). The radio base station controller 20 is instructed to notify the communication terminal 60 (60A, 60B). The radio base station control device 20 receives these pieces of information, holds them in the radio base station control device 20, and simultaneously transmits them to the base station 30 (S102b). Further, the base station 30 receives the broadcast information, the identifier, and the information indicating the retention time of the broadcast information transmitted from the radio base station control apparatus 20, and follows the instructions of the broadcast distribution system 10 to manage the broadcast information through the common channel. Distribution is performed by broadcast distribution to the communication terminal 60A and the communication terminal 60B (S102c). In the present embodiment, the broadcast distribution unit 11 gives an instruction to notify the distributed identifier via the broadcast channel at the same time as the broadcast distribution instruction (S102a) of the broadcast information. Only the notification instruction of the distributed identifier may be performed independently at a timing different from the distribution instruction.

  In the broadcast distribution system 10, the broadcast information distributed to the communication terminal 60 by the above steps, information indicating the identifier and the retention time of the broadcast information is sent from the broadcast distribution unit 11 to the distributed identifier holding unit 12, These are held for at least the time set as the holding time (S103).

  Here, since the communication terminal 60 (60A, 60B) cannot use the common channel and the individual channel at the same time, it started using the individual channel before the broadcast distribution by the broadcast distribution system 10. (S100) Since the communication terminal 60A uses the individual channel at the time when the broadcast distribution is performed through the common channel, the broadcast information distributed through the common channel cannot be acquired and the broadcast distribution reception fails. (S104). Thereafter, even if the communication terminal 60A terminates the use of the individual channel due to the end of the call or the like (S107) and is in a standby state, it cannot grasp whether the distribution through the common channel is performed while using the individual channel. It is also impossible to recognize whether broadcast information has been distributed.

  On the other hand, the communication terminal 60B in the standby state is set with the broadcast information distributed by the common channel from the base station 30 and the identifier and the holding time given in association with the broadcast information. In this case, information regarding the holding time can be received by the broadcast information receiving unit 61 (S105). The broadcast information received by the broadcast information receiving unit 61 and the identifier given in association with the broadcast information are sent to the received identifier holding unit 62, and at least the holding time is received by the received identifier holding unit 62. It is held for the set time (S106).

  Broadcast information with identifiers performed in the broadcast distribution system 10, radio base station controller 20 and base station 30 (S101), broadcast distribution of broadcast information (S102a to S102c), distributed broadcast information and identifiers (S103) is performed every time the broadcast information is broadcasted, and the distributed identifier information held in the distributed identifier holding unit 12 is updated each time the above steps are repeated. On the other hand, every time broadcast information is distributed from the broadcast distribution system 10 via the radio base station control device 20 and the base station 30 as described above, the communication terminal 60 in the standby state is in communication with the communication terminal 60B. As described above, by repeating the broadcast distribution reception (S105) and the received broadcast information and the holding of the identifier (S106), the received identifier information held in the received identifier holding unit 62 is updated.

  Next, the broadcast delivery system 10 notifies the information on the delivered identifier to the communication terminals 60A and 60B through the broadcast channel. Specifically, in the radio base station control device 20, based on the instruction to notify the distributed identifier, which is instructed from the broadcast distribution system 10 simultaneously with the broadcast distribution instruction (S102a) of the broadcast information, An identifier that is within the retention time (within the effective time from the broadcast distribution time point) is selected from the identifiers held by the radio base station controller 20, and transmitted to the base station 30 so that the identifier is notified through the broadcast channel. (S111a). Furthermore, the base station 30 receives the identifier transmitted from the radio base station control device 20, and notifies the subordinate communication terminal 60A and communication terminal 60B through the broadcast channel according to the instruction of the broadcast distribution system 10 (S111b). .

  The broadcast information notified through the broadcast channel is always transmitted from the base station 30 at regular intervals, and the subordinate communication terminal 60 obtains it without making a transmission or the like from the communication terminal 60 to the base station 30. It can be carried out. Accordingly, the communication terminal 60 can always obtain the information except when the communication terminal 60 is out of the service area or when the dedicated channel or the common channel is being used. In this way, the communication terminal 60A and the communication terminal 60B can easily acquire information on the distributed identifier notified through the broadcast channel.

  The communication terminal 60A receives the broadcast information notified by the broadcast channel (S112), and confirms whether it is necessary to transmit a broadcast information distribution request (S114). Further, the communication terminal 60B receives the notification information in the same manner as the communication terminal 60A (S113), and confirms whether it is necessary to transmit a distribution request (S115).

  At this time, a specific determination method for confirming the necessity of the distribution request in the communication terminals 60A and 60B will be described with reference to the flowchart of FIG.

  In this flow, after receiving the notification information (S112, S113), it is first determined whether the received notification information includes a distributed identifier (S201). If the broadcast identifier is included in the broadcast information, it is determined whether the identifier held in the received identifier holding unit 62 of the communication terminal 60 matches the broadcast identifier notified by the broadcast information (S202). . At this time, since the identifier notified as the distributed identifier is information indicating the broadcast information distributed from the broadcast distribution system 10, the received identifier holding unit 62 includes the identifier notified as the distributed identifier. When an identifier that is not held is included, the broadcast information specified by the identifier is distributed from the broadcast distribution system 10 but cannot be received by the communication terminal 60. If there is such an identifier, it is determined whether an individual distribution request for broadcast information associated with the identifier is transmitted (S203). If a distribution request has not been transmitted, an individual distribution request needs to be transmitted (S205). However, if the identifier notified as the distributed identifier and the identifier held in the received identifier holding unit 62 match or do not match, it is not necessary to send an individual distribution request. (S204) and the subsequent processing is not performed.

  Here, in the sequence diagram of FIG. 4, it is assumed that the broadcast information to which the identifier “003” is given from the broadcast distribution system 10 is distributed via the common channel (S102), and this identifier “003” is set as a distributed identifier. "Is notified as broadcast information through the broadcast channel (S111). At this time, since the communication terminal 60B has received the broadcast information (S105), the identifier “003” is held in the received identifier holding unit 62 as a received identifier (S106). Therefore, if the determination is made according to the flowchart of FIG. 5, the delivered identifier (“003”) notified through the broadcast channel matches the received identifier (“003”) held in the received identifier holding unit 62. Therefore, it is not necessary to perform the subsequent processing, and the processing relating to the reception of the broadcast information ends.

  On the other hand, the communication terminal 60A failed to receive the broadcast information due to the use of the dedicated channel (S104), so the identifier “003” is held in the received identifier holding unit 62 as the received identifier. Absent. Therefore, if the determination is made according to the flowchart of FIG. 5, the distributed identifier (“003”) notified through the broadcast channel is not held in the received identifier holding unit 62. If it is determined that the distribution request has not been received and a distribution request has not been made, it is determined that an individual distribution request needs to be transmitted.

  As a result of confirming the necessity of transmission of the distribution request (S114) as described above, the communication terminal 60A determines that it is necessary to transmit the individual distribution request, and transmits the individual distribution request for the broadcast distribution. Specifically, from the distribution request transmission unit 64 of the communication terminal 60, information of an identifier ("003" in the present embodiment) that identifies broadcast information that has been found to be unreceived via the dedicated channel, Information (for example, the telephone number of the communication terminal 60A) specifying the communication terminal 60A that makes the individual distribution request is transmitted to the base station 30 (S116a). The base station 30 acquires the information transmitted from the communication terminal 60A and transmits it to the radio base station controller 20 (S116b). Further, the radio base station control device 20 acquires the information transmitted from the base station 30 and transmits it to the broadcast distribution system 10 (S116c).

  The distribution request receiving unit 13 of the broadcast distribution system 10 receives the individual distribution request for the broadcast information transmitted from the communication terminal 60A via the base station 30 and the radio base station control device 20 (S117). The information included in the request is sent to the broadcast information individual distribution unit 14. The broadcast information individual distribution unit 14 searches the distributed identifier holding unit 12 based on the identifier information (“003” in this embodiment) included in the distribution request, and broadcast information associated with this identifier. To get.

  The broadcast information individual distribution unit 14 of the broadcast distribution system 10 then wirelessly transmits the broadcast information requested for individual distribution to the communication terminal 60A that has transmitted the distribution request via the individual channel. The control device 20 is instructed (S118a). Thereafter, the data is transmitted from the base station 30 to the communication terminal 60A via the dedicated channel via the base station 30 (S118b) (S118c).

  In the communication terminal 60A, the broadcast information individually distributed from the base station 30 through the individual channel as described above is received by the individual distribution receiving unit 65 (S119). As described above, the communication terminal 60A can also receive the broadcast information specified by the identifier “003”, and the processing related to the broadcast distribution ends.

  According to the present embodiment, in addition to the case where broadcast delivery can be received conventionally as in the case of the communication terminal 60B, the dedicated channel is being used when the broadcast delivery of broadcast information is performed as in the case of the communication terminal 60A. Even if the broadcast information cannot be received due to being temporarily out of service area or the like, the identifier for identifying the broadcast information that has already been distributed is included in the broadcast information after the broadcast distribution. Be notified. For this reason, the communication terminal 60A can identify the broadcast information that could not be received, and receives the broadcast information by transmitting the distribution request and individually transmitting from the broadcast distribution system 10. be able to. Therefore, compared with the conventional broadcast delivery method, according to the broadcast delivery method using the mobile communication system 100 according to the present embodiment, the reception rate of the broadcast delivery in the communication terminal 60 can be increased.

  Further, in the broadcast distribution method of the present embodiment, after the broadcast information is distributed, the identifier of the distributed broadcast information is added by adding the distributed identifier information to the broadcast information of the conventionally used broadcast channel. After the communication terminal 60 confirms whether or not there is any unreceived broadcast information, a distribution request is individually transmitted to the broadcast distribution system 10 only from the communication terminal 60 side that is found to have unreceived broadcast information. . Therefore, the new communication required to increase the reception rate of the above-mentioned broadcast delivery is only a delivery request from the communication terminal 60 with unreceived broadcast information and individual delivery of corresponding broadcast information. is there. Usually, it has been confirmed that the success rate of broadcast distribution reception is about 90% of all terminals under the control of the base station 30. Therefore, according to the present embodiment, only about 10% of the communication terminals 60 that have failed to receive perform communication related to individual distribution of broadcast information. Compared with the case where the delivery confirmation is individually performed with all the communication terminals under its control, the possibility of inducing congestion can be greatly reduced.

  Furthermore, the timing at which the communication terminal 60, which has not been able to receive broadcast information due to being in a call or out of service area as described above, returns to the reception-ready state (standby state) by the end of the call or return to the service area is Different for each. Each communication terminal 60 that has returned to a receivable state can acquire confirmation information that is always notified through a notification channel, thereby confirming the presence / absence of unreceived broadcast information and transmitting a distribution request. The terminal 60 can acquire the broadcast information at the fastest timing after returning to the receivable state. In addition, since a plurality of communication terminals having unreceived broadcast information transmit distribution requests at different timings under the control of the base station 30, the possibility of inducing congestion due to increased communication can be further reduced.

  The preferred embodiments of the present invention have been described above, but the mobile communication system 100 according to the present invention is not limited to the above-described embodiments, and can take various forms.

  For example, in the present embodiment, an apparatus including all of the broadcast distribution unit 11, the distributed identifier holding unit 12, the distribution request receiving unit 13, and the broadcast information individual distribution unit 14 is used as the broadcast distribution system 10. Although the configuration is provided separately from the control device 20 and the base station 30, the above function may be distributed to the radio base station control device 20 and the base station 30.

It is a figure which shows the structure of the mobile communication system which concerns on suitable embodiment of this invention, and those connection relations. It is a figure which shows the hardware configuration of the broadcast delivery system, radio | wireless base station control apparatus, and base station in embodiment of this invention. It is a figure which shows the hardware constitutions of the communication terminal in embodiment of this invention. It is a sequence diagram explaining the broadcast delivery process by the mobile communication system which concerns on this embodiment. It is a flowchart explaining the specific judgment method which confirms the necessity of a delivery request | requirement in a communication terminal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Broadcast delivery system, 11 ... Broadcast delivery part, 12 ... Delivered identifier holding part, 13 ... Delivery request receiving part, 14 ... Broadcast information separate delivery part, 20 ... Radio base station control apparatus, 30 ... Base station , 60 ... communication terminal, 61 ... broadcast information receiving unit, 62 ... received identifier holding unit, 63 ... distributed identifier obtaining unit, 64 ... distribution request transmitting unit, 65 ... individual distribution receiving unit, 100 ... mobile communication system.

Claims (3)

A plurality of communication terminals that communicate by connecting to a mobile communication network, and a broadcast distribution system that distributes broadcast information to the plurality of communication terminals via the mobile communication network. A mobile communication system,
The broadcast distribution system includes:
Broadcast delivery means for delivering broadcast information having an identifier to the plurality of communication terminals;
Distributed identifier holding means for holding the distributed broadcast information distributed by the broadcast distribution means and the identifier of the distributed broadcast information in association with each other;
A distributed identifier notifying unit for notifying the plurality of communication terminals of the identifier of the distributed broadcast information held by the distributed identifier holding unit via a broadcast channel;
A distribution request receiving means for receiving an individual distribution request for broadcast information having an identifier of the distributed broadcast information transmitted from the communication terminal;
With reference to the identifier of the distributed broadcast information included in the individual distribution request received by the distribution request receiving means, the communication terminal has the identifier held by the distributed identifier holding means. Broadcast information individual distribution means for individual distribution of distributed broadcast information,
With
The communication terminal is
Broadcast information receiving means for receiving broadcast information having the identifier broadcast from the broadcast distribution system;
Received identifier holding means for holding the identifier of the broadcast information received by the broadcast information receiving means;
A distributed identifier acquisition means for acquiring an identifier of the distributed broadcast information notified from the broadcast distribution system through a broadcast channel;
With reference to the identifier of the broadcast information held by the received identifier holding unit and the identifier of the distributed broadcast information acquired by the distributed identifier acquisition unit, the identifier of the distributed broadcast information is When there is an identifier that is not held in the received identifier holding means, a distribution request transmission means for sending a distribution request for distributed broadcast information having the identifier to the broadcast distribution system;
Individual distribution receiving means for receiving the distributed broadcast information individually distributed from the broadcast distribution system in response to transmission of the distribution request by the distribution request transmitting means;
A mobile communication system comprising: A broadcast distribution system that distributes broadcast information via a mobile communication network to a plurality of communication terminals that communicate by connecting to a mobile communication network,
Broadcast delivery means for delivering broadcast information having an identifier to the plurality of communication terminals;
Distributed identifier holding means for holding the distributed broadcast information distributed by the broadcast distribution means and the identifier of the distributed broadcast information in association with each other;
A distributed identifier notifying unit for notifying the plurality of communication terminals of the identifier of the distributed broadcast information held by the distributed identifier holding unit via a broadcast channel;
A distribution request receiving means for receiving an individual distribution request for broadcast information having an identifier of the distributed broadcast information transmitted from the communication terminal;
With reference to an identifier of the distributed broadcast information included in the individual distribution request received by the distribution request receiving means, the communication terminal has the identifier held by the distributed identifier holding means. Broadcast information individual distribution means for individual distribution of distributed broadcast information,
A broadcast distribution system comprising: A communication terminal that communicates by connecting to a mobile communication network,
Broadcast information receiving means for receiving broadcast information having an identifier distributed from the broadcast distribution system;
Received identifier holding means for holding the identifier of the broadcast information received by the broadcast information receiving means;
A distributed identifier acquisition means for acquiring an identifier of the distributed broadcast information notified from the broadcast distribution system;
With reference to the identifier of the broadcast information held by the received identifier holding unit and the identifier of the distributed broadcast information acquired by the distributed identifier acquisition unit, the identifier of the distributed broadcast information If there is an identifier that is not held by the received identifier holding means, a delivery request transmission means for sending a delivery request for delivered broadcast information having the identifier to the broadcast delivery system,
Individual distribution receiving means for receiving the distributed broadcast information individually distributed from the broadcast distribution system in response to transmission of the distribution request by the distribution request transmitting means;
A communication terminal comprising:

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