Abstract: To provide a scheme for deciding a switching method for the video call when an UE#1 in video call with an UE#2 is caused to perform handover from an E-UTRAN to a UTRAN/GERAN. A mobile communication method according to the present invention is summarized by including the steps of: deciding the switching method for the video call, when a video bearer and a voice bearer which configure a path for the video call are set, by an IMS; and maintaining information on the decided switching method and association information with which information on the video bearer is in association with information on the voice bearer, by a mobile communication network and an eNB.

Abstract: An object is to increase the efficiency of transmission of M2M communication data by restricting the M2M communication in accordance with the communication condition of an access network 2. In a communication system according to the present invention, the access network 2 is configured to transmit instruction information which specifies the communication methods of M2M applications 30, to any of an M2M platform 1, M2M application servers #1 to #N, and M2M devices #1/#11/#12 in accordance with the communication condition. The M2M platform 1 is configured to control the communication methods of the M2M applications 30 on the basis of the instruction information.

Abstract: A private branch exchange system capable of enabling radio communication terminals belonging to an extension group to perform device-to-device direct communication (D2D communication) by using a radio access network such as LTE. A private branch exchange server 300 includes a transition trigger detection unit 310 configured to detect a trigger for a transition to the direct communication, an extension group list retention unit 320 configured to retain an extension group list containing an identifier of the radio communication terminal belonging to the extension group, a subgroup selection unit 330 configured to select a certain subgroup from the extension group list, and a direct communication command unit 340 configured to send permission information on the direct communication and configuration information on a communication environment necessary for the direct communication to the radio communication terminal contained in the subgroup selected by the subgroup selection unit 330.

Abstract: Provided are a billing system, a billing apparatus, and a billing method capable of billing for device-to-device direct communication (D2D communication) performed using a radio access network such as LIE. A terminal 400A sends a billing apparatus 200 billing-related information to be used to bill for direct communication. The billing apparatus 200 acquires the billing-related information from the radio communication terminal and generates billing information on the direct communication based on the billing-related information acquired.

Abstract: A mobile communication method according to the present invention includes the steps of: sending “INVITE” from a UE#1 to a P-CSCF/VATF in a visited network of the UE#1; sending “INVITE” from the P-CSCF/VATF to an IMS; and allocating, by the P-CSCF/VATF, an MGW#1 to the path for voice communications.

Abstract: Provided are a radio communication system, a communication control apparatus, and a communication control method allowing radio communication terminals to call each other in a case where device-to-device direct communication (D2D communication) is provided using a radio access network such as LTE. A terminal 400A sends a communication control apparatus a paging signal containing a direct communication request requesting for direct communication with a terminal 400B. The communication control apparatus 200 sends the terminal 400B a paging signal containing information indicating that the terminal 400A is requesting direct communication and configuration information on a communication environment necessary for direct communication.

Abstract: Provided are a radio communication terminal, a communication control apparatus, and a communication control method capable of enhancing the possibility of providing a communication application through inter-terminal direct communication (D2D communication) even in a case where a call request cannot be accepted due to congestion on the network side. In a terminal 400A, a call restriction reception unit 420 receives a call restriction containing configuration information on a communication environment necessary for direct communication. During restriction of initiation of communication to the radio access network, a radio communication unit 440 executes direct communication with another radio communication terminal based on the configuration information if a direct communication determination unit 430 determines that a communication application is executable through direct communication.

Abstract: Provided are a radio communication terminal capable of causing a communication application to speedily find out whether D2D communication is possible by using a radio access network such as LTE. A terminal 400A includes a terminal finding unit 405 configured to find a candidate terminal capable of executing direct communication with the terminal 400A, a phonebook processing unit 420 configured to obtain direct-communication phonebook data containing an identifier of the candidate terminal found by the terminal finding unit 405, based on regular phonebook data containing an identifier of another radio communication terminal and being associated with the terminal 400A, and a direct communication execution unit 430 configured to execute direct communication with a counterpart terminal (e.g., a terminal 400B) indicated in a communication request from a communication application 410A, 410C, when the counterpart terminal is contained in the direct-communication phonebook data as the candidate terminal.

Abstract: Provided are a radio communication system allowing D2D communication to be provided by using a radio access network such as LTE while controlling the radio communication terminals from the network side. A radio base station 100 broadcasts broadcast information to a predetermined radio communication area, the broadcast information indicating whether or not the direct communication is permitted. Terminals 400A, 400B start the direct communication based on the broadcast information received from the radio base station 100. When the direct communication is permitted, the radio base station 100 further sends configuration information on a communication environment necessary for direct communication to the predetermined communication area, and the terminals 400A, 400B establish the communication environment necessary for the direct communication based on the configuration information received from the communication control apparatus.

Abstract: Provided are a communication system capable of causing a communication application to speedily find out whether D2D communication is possible or not. The phonebook server 300 includes a phonebook data acquisition unit 310 configured to acquire first phonebook data containing an identifier of a terminal 400B, a terminal location acquisition unit 320 configured to acquire a location of the terminal 400B contained in the first phonebook data acquired by the phonebook data acquisition unit 310, a phonebook data generation unit 330 configured to generate second phonebook data containing an identifier of a candidate terminal capable of direct communication, based on the location of the terminal 400B acquired by the terminal location acquisition unit 320, and a transmission unit 340 configured to send a terminal 400A the second phonebook data generated by the phonebook data generation unit 330.

Abstract: A mobile station UE according to the present invention includes a control unit 12 configured, upon determination based on “EPC-MO-LR support” included in “Attach Accept” or “TAU Accept” received from a mobility management node MME that “EPC-MO-LR” is not supported in a mobile communication system of an E-UTRAN scheme, to switch the E-UTRAN scheme to a UTRAN scheme after establishing a connection in the mobile communication system of the E-UTRAN scheme, and then transmit “NAS MO-LR Request” to a mobile switching center SGSN/MSC.

Abstract: A private branch exchange system capable of enabling radio communication terminals belonging to an extension group to perform device-to-device direct communication (D2D communication) by using a radio access network such as LTE. A private branch exchange server 300 includes a transition trigger detection unit 310 configured to detect a trigger for a transition to the direct communication, an extension group list retention unit 320 configured to retain an extension group list containing an identifier of the radio communication terminal belonging to the extension group, a subgroup selection unit 330 configured to select a certain subgroup from the extension group list, and a direct communication command unit 340 configured to send permission information on the direct communication and configuration information on a communication environment necessary for the direct communication to the radio communication terminal contained in the subgroup selected by the subgroup selection unit 330.

Abstract: A mobile communication system and method that includes a radio access system employing a first communication scheme supporting packet-switched communication and a radio access system employing a second communication scheme supporting both circuit-switched communication and the packet-switched communication. The mobile communication system is configured to switch between a first communication state and a second communication state realizing single radio voice call continuity (SRVCC). The first communication state is when a first mobile station visits the radio access system employing the first communication scheme, and performs voice communication with a second mobile station and packet communication by using packet-switched system.

Abstract: A mobile communication method is discussed involving causing Mobile Switching Center (MSC) server/Circuit Switch-Media Gateway (CS-MGW) to transmit a path switching signal and activate a timer, causing User Equipment (UE) #2 to switch a transmission destination of a voice communication data signal addressed to UE#1 from Serving/Packet Data Network Gateway (S/P-GW) to the MSC server/CS-MGW, causing the MSC server/CS-MGW transmits a path restoration instruction signal if not detecting that handover of the UE#1 from Evolved Universal Terrestrial Radio Access Network (E-UTRAN) to UTRAN/GSM and EDGE Radio Access Network (GERAN) is completed before the timer expires, and causing the UE#2 to switch a transmission destination of the voice communication data signal addressed to the UE#1 from the MSC server/CS-MGW to the S/P-GW in response to the path restoration instruction signal.

Abstract: In a mobile communication system capable of switching between a first communication state and a second communication state, in a case of a first communication state, a VoIP media signal is exchanged between a mobile station. UE #1 and a mobile station UE #2 via an LTE radio access system and a node S-GW, a VoIP control signal is exchanged via the LTE radio access system, the node S-GW, and IMS, and in a case of a second communication state, a circuit-switched signal is exchanged between the mobile station UE #1 and an enhanced MSC/MGW via a 2G/3G radio access system, the VoIP media signal is exchanged between the enhanced MSC/MGW and the mobile station UE #2 via the node S-GW, and the VoIP control signal is exchanged between the enhanced MSC/MGW and the mobile station UE #2 via the node S-GW and the IMS.

Abstract: The present invention provides the steps of: at a priority control node (PCRF), when reception of an invite signal including priority call information is notified from a call control node (P-CSCF), determining whether it is required to change the ARP of a call control signal bearer for sending the invite signal from a gateway (P-GW) to a mobile terminal (UE) to a higher ARP than the priority set in the call control signal bearer; when change of the ARP is determined to be required, changing the ARP of the call control signal bearer to a higher ARP than the ARP set in the call control signal bearer; and performing a paging for the mobile terminal (UE) according to the priority of the call control signal bearer.

Abstract: A mobile communication method according to the present invention includes the steps of : causing an MME#1 after restart not only to transmit “Paging” to a UE but also to transmit “Delete Session Request” containing IMSI of the UE and “Cause=MME restart” to an S-GW#1, when receiving “Downlink Data Notification” containing the IMSI of the UE from the S-GW#1; causing the S-GW#1 not only to release a bearer for the UE but also to transmit the “Delete Session Request” containing the “Cause=MME restart” to the P-GW#1, upon receipt of the “Delete Session Request”; and causing the P-GW#1 to release the bearer for the UE.

Abstract: A message distribution method according to the present invention includes the steps of: (A) determining, at a message distribution station (CBC), distribution area information and a distribution type, based on a message distribution request received from a flash report transmission station (CBE) and containing distribution target area information, and reporting, from the message distribution station (CBC) to a radio base station (eNB), the distribution area information and the distribution; and (B) determining, at the radio base station (eNB), the distribution area, based on the distribution area information and the distribution type, and distributing, from the radio base station to the mobile station in the distribution area, a predetermined message.

Abstract: A mobile communication method according to the present invention includes a step A of releasing, by a gateway device S-GW, a first GBR bearer for a mobile station UE and transmitting “Downlink Data Notification” to a packet exchanger SGSN if a fault of a radio network controller RNC is detected in the state in which a second GBR bearer for the mobile station UE is set, a step B of transmitting, by the packet exchanger SGSN, “Paging” to the mobile station UE, and a step C of starting, by the packet exchanger SGSN, a procedure for releasing the second GBR bearer when no response to the “Paging” is received from the mobile station UE in a predetermined period.

Abstract: A mobile communication system according to the present invention includes the steps of: causing an UE to switch a radio access network in a connection destination from E-UTRAN to UTRAN/GERAN; causing an MME to receive “Delete Bearer Request” to a voice communication packet bearer from an S-GW; and causing the MME to transmit to the S-GW a “Delete Bearer Response” to the “Delete Bearer Request”, without giving an instruction to the UE#1 or the E-UTRAN to release the voice communication packet bearer, if a core bearer disconnection flag is set in the received “Delete Bearer Request”.