Abstract: A switch is provided. The switch is connected to a control apparatus for controlling Lawful Interception, and relays packets transmitted and received between a user apparatus and an IMS apparatus in the home network of the user apparatus. The switch includes a determination unit configured to determine whether the user apparatus is a Lawful Interception target or whether the user apparatus is a roaming user; and a transmission unit configured to, in the case where the user apparatus is a Lawful Interception target or in the case where the user apparatus is a roaming user, transmit to a mobile management switch information indicating to the user apparatus that the user apparatus should transmit and receive the packets to and from the IMS apparatus without encryption.

Abstract: A switch is provided. The switch is connected to a control apparatus for controlling Lawful Interception, and relays packets transmitted and received between a user apparatus and an IMS apparatus in the home network of the user apparatus. The switch includes a determination unit configured to determine whether the user apparatus is a Lawful Interception target or whether the user apparatus is a roaming user; and a transmission unit configured to, in the case where the user apparatus is a Lawful Interception target or in the case where the user apparatus is a roaming user, transmit to a mobile management switch information indicating to the user apparatus that the user apparatus should transmit and receive the packets to and from the IMS apparatus without encryption.

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 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 in which the gateway apparatus P-GW transmits “Proxy Binding Acknowledgement containing “O Flag setting information” indicating whether or not a DNSv6 address is allocated to the mobile station UE to the gateway apparatus S-GW in response to the reception of the “Proxy Binding Update”, and a step in which the gateway apparatus S-GW instructs the mobile station UE that there is no need to acquire a DNSv6 address using a DHCP request signal with “O Flag” in RA when the received “O Flag setting information” indicates that a DNSv6 address is allocated to the mobile station UE.