Abstract: The characteristic of a mobile communication system according to the present invention is that the mobile communication system includes the steps of: causing an MME in a visitor network of UE#1 to acquire SRVCC capability of the UE#1 and to notify an HSS of the SRVCC capability of the UE#1 in an attach process or location registration process of the UE#1; and causing an ATCF, which controls an ATGW, to acquire the SRVCC capability of the UE#1, in a registration process of the UE#1 with IMS.

Abstract: A mobile communication method in a mobile communication system according to the present invention in which when MME#1 is restarted in a first state in which a PDN connection #1 including one or more EPS bearers #1 is set among a UE, an S-GW#1, and a P-GW#1, the first state transitions to a second state in which the PDN connection #1 is released between the UE and the S-GW#1 and the connection is maintained only between the S-GW#1 and the P-GW#1, the mobile communication method including the step of not transmitting, by the MME#1, “Paging” whose destination is the UE upon receiving “DDN” including IMSI of the UE after detecting that re-attach processing for the mobile station has been executed in the second state.

Abstract: A mobile communication method according to the present invention includes: a step A of transmitting, a predetermined inquiry signal to an HSS, upon receipt of a terminating signal addressed to a UE from a communication counterpart network; a step B of transmitting, the predetermined inquiry signal to an MME; a step C of determining, by the MME, whether or not it is possible to continue terminating processing based on the terminating signal addressed to the UE in response to the predetermined inquiry signal; a step D of transmitting, a response signal for notifying of determination result to the HSS; a step E of transmitting, the response signal to the IMS device; and a step F of determining, by the IMS device, whether or not to continue the terminating processing based on the terminating signal on the basis of the determination result notified by the response signal.

Abstract: A mobile communication method according to an embodiment of the invention includes: a step A of causing a S-GW#2 to send “Downlink Data Pending” to a MME in a procedure for the S-GW#2 to establish a user data bearer for the UE with a P-GW; a step B of causing the MME to send an “Initial Context Setup Request” for requesting establishment of an S1 bearer/E-RAB for the UE between the S-GW#2 and an eNB under the control of the S-GW#2 while holding a NAS signaling connection established with the UE without releasing the NAS signaling connection, when the MME receives the “Downlink Data Pending”; and a step C of causing the S-GW#2 to send the “RA” to the UE via the S1 bearer/E-RAB for the UE.

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 communcation network and an eNB.

Abstract: To avoid a phenomenon that a UE cannot transmit uplink packets even when a TAU/RAU process, handover process, or radio switching process of the UE frequently occurs and an S-GW to which the UE is to be connected is frequently changed in an EPC network to which PMIPv6 is applied. A mobile communication system including an EPC network to which PMIPv6 is applied is configured such that a S-GW#2 determines whether or not to transmit the RA to the UE based on RA transmission information transmitted by a P-GW, when the S-GW to which the UE is to be connected is changed from an S-GW#1 to the S-GW#2 by the TAU/RAU process, handover process, or radio switching process.

Abstract: A mobile communication method according to the present invention includes the step of, if handover of bearers configuring a path for a video communication from E-UTRAN to UTRAN fails, causing a MME or a MSC server to decide whether to hand over only a PS voice bearer of the bearers from E-UTRAN to UTRAN or to cancel the handover of the bearers.

Abstract: A communication application is caused to be capable of receiving a “RA” before “Router lifetime” expires, while avoiding waste of radio resources, waste of a battery of a mobile station UE or an externally-connected apparatus, or network processing required for the mobile station UE to transition between an “IDLE state” and an “ACTIVE” state. The mobile station UE according to the invention includes a RA reception unit configured to receive a “RA” from the network and a RA transmission unit 12 configured to transmit a “RA#1” to the communication application 20 when the “RA#1” is received by the RA reception unit 11. The RA transmission unit 12 is configured to retransmit the “RA#1” to the communication application 20 before the “Router lifetime” in the communication application expires even when a “RA#2” is not re-received by the RA reception unit 11.

Abstract: A mobile communication method according to the present invention includes a step A of establishing a connection in a core network for an emergency call originated by UE, a step B of performing “IMS emergency registration processing originated by the UE”, and a step C of performing processing for originating the emergency call from the UE. In the step B, a “Cell ID” of a serving cell for the UE saved in an HSS is transmitted to an IMS. In the step C, the IMS selects an emergency notification device 10 as a connection destination of the emergency call based on the “Cell ID” of the serving cell for the UE.

Abstract: A mobile communication method according to the present invention includes a step A of re-establishing a PDN connection by P-GW in case of detecting implementation of C-Plane processing related to the mobile station after detecting restart of PCRF.

Abstract: A method of performing a handover according to the invention includes a step A of causing an MME to transmit “Forward Reloc Req” to an SGSN, and a step B of causing the MME to release a PS bearer which has been used for the voice communications and the packet communications of the UE#1 in the mobile transmission network accommodating the E-UTRAN, when detecting that a handover from E-UTRAN to UTRAN/GERAN for voice communications of a UE#1 is completed after detecting that establishment of a PS bearer is refused in the SGSN.

Abstract: A mobile communication method according to the present invention includes the steps of: starting, by a UE, re-attach processing for MME#2, upon receiving “Paging”; transmitting, by MME#1, “DDN Ack” including the IMSI of the UE, which is included in the “DDN”, and “Cause=Re-Attach Success”, to S-GW#1 specified by S-GW address #1 included in the “DDN”; and releasing, by S-GW#1, a PDN connection #1 between S-GW#1 and P-GW#1, upon receiving the “DDN Ack”, the PDN connection #1 corresponding to the IMSI of the UE included in the “DDN Ack”.

Abstract: A mobile communication method according to the present invention includes the steps of: starting, by a UE, re-attach processing for MME#2, upon receiving “Paging”; transmitting, by MME#1, “DDN Ack” including “EPS Bearer ID#1” included in “DDN” and “Cause=Re-Attach Success” (information indicating that re-attach processing is successful), to S-GW#1 specified by S-GW address #1 included in the “DDN”; and releasing, by S-GW#1, a PDN connection #1 between S-GW#1 and P-GW#1, upon receiving the “DDN Ack”, the PDN connection #1 corresponding to the “EPS Bearer ID#1” included in the “DDN Ack”.

Abstract: A mobile communication method according to the present invention includes a step A of causing an SCC-AS to transmit an inquiry signal to an HSS when the SCC-AS receives “Invite” addressed to a UE; a step B of causing the HSS to transmit a paging request signal; a step C of causing the HSS to determine a RAT which the UE is served in response to a paging result notification signal including a paging result in at least one of an UTRAN/GERAN and an E-UTRAN; a step D of causing the HSS to transmit serving area information of the UE including information on the RAT which the UE is served to the SCC-AS/S-CSCF; and a step E of causing the SCC-AS/S-CSCF to transfer the “Invite” addressed to the UE, to the UTRAN/GERAN or the E-UTRAN using a terminating call scheme selected based on the serving area information of the UE.

Abstract: A handover method according to the present invention includes a step A of transmitting, by MME, “Reloc/HO Req” including “PS/CS HO Indication” to RNC/BSS via MSC, a step B of transmitting, by the MME, “Reloc/HO Req” including the “PS/CS HO Indication” to the RNC/BSS via SGSN, and a step C of transmitting, by the RNC/BSS, “PS to CS Resp” and “Forward Reloc Resp” to the MME after both the “Reloc/HO Req (for a CS bearer)” and the “Reloc/HO Req (for a PS bearer)” are received.

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”.

Abstract: A mobile communication method according to the present invention includes the steps of: transmitting an “Extended Service Request” from a mobile station UE in Idle mode to a mobility management node MME via a radio base station eNodeB; transmitting an “Initial UE Context Setup Request” from the mobile station UE to the radio base station eNodeB, the “Initial UE Context Setup Request containing priority call information; and preferentially allocating resources to the E-RAB for the mobile station UE by the radio base station eNodeB based on the priority call information contained in the received “Initial UE Context Setup Request.

Abstract: A mobile communication method according to the present invention includes a step A of re-establishing, by IMS (P-CSCF), association among a PDN connection, a PCC connection #1 and a PCC connection #2 in case of detecting a specified event after detecting a failure in PCRF.

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: There are provided a scalable method for mobility management applied to an IP-based network system including a plurality of routers and a plurality of servers, a part of which serve as a home routing manager (HRM), a part of which serve as local routing managers (LRM) for individual mobile nodes. The method at least comprises the steps of sending a first query about a routing address of a destination mobile node toward the HRM, based on an activation notification (AN) from an ingress access router (AR) of the plurality of routers, triggered by a source mobile mode, from an LRM receiving the activation notification; relaying the first query via one or more intermediate routing managers (IRM) closer to the HRM until the first query reaches the HRM; and in response to the first query, sending the routing address of the destination mobile node back to the ingress access router through the relay path from the HRM.