Abstract: A UE 100 is connectable to an IP-CAN conforming to Internet protocol via any one of LTE supporting a service conforming to an IP multimedia subsystem and 3G not supporting the service conforming to the IP multimedia subsystem. In a case where the UE 100 receives a connection rejection notification from a SGSN capable of communicating with the IP multimedia subsystem after transitioning from LTE to 3G, the UE 100 suspends transmission of a request for reconnection to the IP access network only if the mobile station is camping in 3G through which the connection rejection notification has been received. Here, the connection rejection notification indicates that the UE 100 is not connectable to the IP multimedia subsystem.

Abstract: Provided are a communication system, a mobile station and a communication method that can suppress the increase of processing loads of an IP-CAN accompanying trials made by mobile stations to connect to the IP-CAN via a wireless access network that does not support any services on the IP multimedia core network subsystem (IMS). For example, a UE (100) receives, from an SGSN via the 3G, service non-supporting information indicating that the 3G does not support any services on the IP multimedia subsystem, and, when having received the service non-supporting information, stops the transmission of an Activate PDP Context Request via the 3G.

Abstract: A mobile station and a communication method are provided, which are capable of preventing a state where no incoming calls can be received from continuing for a long time even if an IP-CAN Bearer, which is a logical communication path used for SIP and audio media, is removed for some reason. UE 100 is connectable to an access network complying with the Internet protocol and executes registration with an IP multimedia subsystem complying with the Internet protocol. The UE 100 includes: a bearer establishment unit 110 configured to establish an IP-CAN Bearer that is a logical communication path between the UE 100 and a PGW constituting the access network; and a registration processing unit 120 configured to execute registration of the mobile station with the IP multimedia subsystem when the bearer establishment unit 110 establishes the IP-CAN Bearer.

Abstract: In a mobile station (UE) according to the present invention, an AS function is configured to notify, when detecting a failure in a radio link established with the radio base station is detected or when discovering a cell subject to a location registration by a cell selection process, a NAS function of the detection or the discovery; and the NAS function is configured to transmit, in response to the notification, a location registration request signal to a mobile switching center (MME).

Abstract: A mobile communication method according to the present invention comprising the subscriber management server device HSS determines either the radio access network of the WCDMA scheme or the radio access network of the LTE scheme as the standby radio access network of the mobile station UE based on the CSFB capability presence/absence information included in the received “Update GPRS Location/Update Location Request” of received the mobile station UE, and a step in which the mobile station UE performs the standby operation in the standby radio access network of the mobile station UE determined by the subscriber management server device HSS.

Abstract: The present invention is designed such that a new SGSN receives a location update message from a terminal (1) having moved from the management area of an old SGSN to the management area of the new SGSN, and the new SGSN having received the location update message sends a GTPv2 signal for getting communication path information corresponding to GTPv2, to the old SGSN. The old SGSN, upon receiving the GTPv2 signal, if holding communication path information of to GTPv1 as a logical communication path established for the terminal (1), sends, as a response, a GTPv2 signal in which the communication path information by GTPv1 is set in an additional parameter 24, to the new SGSN.

Abstract: Even if a failure has occurred in core network equipment in a state in which bearers are established between a large number of UEs and a packet data network, congestion in the network is avoided. A mobile communication method according to the present invention includes steps of transmitting, by an MME, to transmit a “PDN Disconnection Request/Detach Request” including barring time to a UE when the MME disconnects a bearer between the UE and the packet data network due to a predetermined reason such as a failure in a S-GW/P-GW or the MME in a state in which the bearer is established, and barring, by the UE, a mobile originating call directed to the packet data network for the barring time.

Abstract: A mobile station UE chooses an appropriate domain for originating AV communication without causing connection delay even when roaming. A mobile communication method according to the present invention includes the steps of: causing a mobility management node MME in an LTE network to send a mobile station UE “ATTACH ACCEPT” containing AV communication provision capability information indicating a capability of providing AV communication in the LTE network; and causing the mobile station UE to determine, based on the AV communication provision capability information, whether to perform the AV communication via an IMS or to perform the AV communication by circuit switching communication.

Abstract: A mobile communication method according to the present invention includes the steps of: when an S-CSCF in an IMS receives a terminating signal directed to a UE, sending the terminating signal from the S-CSCF to an SCC-AS in the IMS, the terminating signal including call-type information indicating whether the terminating signal is for voice communication or AV communication; sending an inquiry signal including the call-type information from the SCC-AS to an HSS; and determining, by the SCC-AS, a domain to which the terminating signal is to be transferred, based on the call-type information and a response signal received from the HSS as a response to the inquiry signal.

Abstract: The invention avoids unnecessary transmission of signals, and shortens time for establishing a bearer for a UE. A mobile communication method of an embodiment includes the steps of: notifying, by a P-CSCF, when the P-CSCF receives a SIP signal #1, a PCRF of QoS corresponding to a SDP-A included in the SIP signal #1; transmitting, by the PCRF, a bearer establishment instruction signal #1 to an EPC on the basis of the QoS; and keeping the P-CSCF, when the P-CSCF receives a SIP signal #2 and the SDP-A included in the SIP signal #1 is the same as a SDP-B included in the SIP signal #2, from notifying the PCRF of the QoS corresponding to the SDP-B.

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: When congestion in an eNB is detected, effective utilization of resources is achieved by adjusting not only a data flow rate in an EPS-RAB but also a band of a core network bearer corresponding with the EPS-RAB. A mobile communication method according to an embodiment includes a step A of causing an eNB to notify an MME of a cause of congestion and identifier information of the EPS-RAB involved in the congestion, when the eNB detects the congestion.

Abstract: Control is performed such that an instruction is not provided to a mobile station UE, which becomes a roaming state by handover, to perform MDT. A mobile communication method according to the present invention includes a step in which a radio base station eNB#1 determines whether “Serving PLMN” of a mobile station UE changes after a procedure to hand over the mobile station UE to a cell under a dominant of a radio base station eNB#2 from a cell under a dominant of the radio base station eNB#1 is completed; and a step in which the radio base station eNB#1 notifies the radio base station eNB#2 of “MDT User Consent Status” when detecting that “Serving PLMN” of the mobile station UE changes, “MDT User Consent Status” indicating that performance of the MDT is not authorized in the mobile station UE.

Abstract: A mobile station UE according to the present invention includes a control unit 13 that is configured not to transmit “RRC Connection Request” to a predetermined network when recognizing that the predetermined network is incompatible with an MTC function based on signaling from the predetermined network.

Abstract: To enable control such that a roaming mobile station UE is not instructed to perform MDT. A mobile communication method according to the present invention includes: a step of determining, by a mobile management node MME, whether a mobile station UE is a roaming mobile station UE (Roaming User), in an Attach procedure of a mobile station UE or a transition procedure to an Active state; and a step of transmitting, by the mobile management node MME, to a radio base station eNB, “User Consent Indication” indicating that the mobile station UE has not given consent for implementation of MDT when it is determined that the mobile station UE is a roaming mobile station UE.

Abstract: A mobile communication method according to the present invention includes: a step A of causing a UE to send a MME accommodating an E-UTRAN a “LTE Attach Request” including capability information indicating whether or not the UE supports “VoLTE communications”; and a step B of causing the MME to judge whether or not to establish an IMS APN bearer between the UE and an IMS APN on the basis of the capability information when judging that an APN of the UE is the IMS APN.

Abstract: A method for reporting multi-address information comprises a step wherein each of mobile stations (UE) obtains the positional information relating to the mobile stations (UE) and manages information relating to the obtained positional information, a step for reporting multi-address information provided with an electronic signature to each of the mobile stations (UE), a step wherein each of the mobile stations (UE) verifies the multi-address information by use of the electronic signature provided to the received multi-address information, a step wherein each of the mobile stations (UE), when the verifying is successful, compares positional information contained in the multi-address information with the positional information being managed, and a step wherein each of the mobile stations (UE) performs processing in response to the multi-address information on the basis of the result of comparing.

Abstract: A mobile communication terminal includes a location registration request unit 120 that makes a location registration request for a location registration in each of the mobile communication networks 200 and 300 to a 3.9G network 300, a location registration response receiving unit 130 that receives a location registration response representing a result of the location registration in the both mobile communication networks 200 and 300 in response to the request for the location registration, a location registration determination unit 140 that determines whether or not the location registration only in the 3.

Abstract: A CSFB processing unit (14) of a mobile switching center (MME) of according to the present invention is configured not to perform CSFB processing to enable a mobile station (UE), which establishes a bearer in a core network of a mobile communication system of the LTE scheme, to start CS communication in a mobile communication system of the WCDMA scheme, when CS communication of the mobile station (UE) in the mobile communication system of the WCDMA scheme is restricted in a specified area, even when the mobile switching center (MME) of the mobile communication system of the LTE scheme detects that a service request signal transmitted by the mobile station contains the first identification information.

Abstract: A mobile communication method according to the present invention includes the steps of: transmitting, by a UE, “Attach Request” for E-UTRAN; transmitting, by an MME, “Attach Reject” in which “#15” is set as “Cause value” to the UE when receiving a notification indicating that the UE cannot be connected to a desired PDN from an authentication server 1 and the MME determines that the UE can utilize CS communications, after receiving the “Attach Request;” and transmitting, by the UE, “Attach Request” for UTRAN/GERAN when the UE receives the “Attach Reject” in which “#15” is set as “Cause value.