Ntt Docomo, Inc.

Shinya Takeda

Kenichiro Aoyagi

Itsuma Tanaka

Wuri Andarmawanti Hapsari

Hiroshi Ishikawa

Atsushi Minokuchi

Yasuharu Konishi

Maoki Hikosaka

Takehiro Ida

Motohiro Abe

Ban Al-Bakri

Alf Zugenmaier

Atsushi Ueki

Shin-Ichi Isobe

Kazuto Shimizu

Koichiro Kunitomo

Masato Tachiki

Hiroaki Tanikawa

Al-Bakri Ban

A network node is a first network node in a VPLMN (Visited Public land mobile network), the network node including a receiving unit configured to receive information relating to network selection, from a second network node in an HPLMN (Home Public land mobile network); a transmitting unit configured to transmit the information relating to network selection, to a user equipment; and a control unit configured to transmit, to the second network node, a response indicating that the user equipment was unable to receive the information relating to network selection, when a response, with respect to the information relating to network selection transmitted to the user equipment, is not received from the user equipment.

Network node and reporting method

A user equipment includes a receiving unit configured to receive, from a network node in a VPLMN (Visited Public land mobile network), information indicating a PLMN to be prioritized and information indicating a trigger of PLMN selection; and a control unit configured to execute the PLMN selection, based on the information indicating the PLMN to be prioritized and the information indicating the trigger of the PLMN selection.

User equipment, network node, and communication system

In 5G cell () of 5G system (), upon detecting that access to the 5G system () is barred, the 5G system () is congested, 5G core network () of the 5G system () does not support IMS-type communication service, or fallback to 4G system () is instructed, UE () selects 4G cell () of the 4G system () as a target cell for connection. The UE () transmits a connection request signal for the IMS-type communication service to the target cell for connection.

User device

A disclosed user device includes a receiver configured to receive emergency information from a network; and a control unit configured to change a process of detecting whether first emergency information is duplicated with second emergency information upon receiving, by the receiver, the second emergency information after the first emergency information, based on the first emergency information.

A network node for connecting to a plurality of base station devices, the plurality of base station devices each being connected to one or a plurality of core networks belonging to different systems, the network node including a controller that controls delivery of emergency information identical to delivery of emergency information activated by a first core network of the plurality of core networks so that the delivery of the emergency information identical to the delivery of the emergency information activated by the first core network of the plurality of core networks is prevented from being activated by a core network other than the first core network; and a transmitter that transmits a message for a base station device to deliver emergency information.

Network node and base station device

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.

Switch and communication method

A user apparatus according to an embodiment is provided. The user apparatus communicates with a base station, and includes a determination unit configured to, in the case of making a VoLTE call, determine whether a predetermined indicator is included in broadcast information received from the base station; and a transmission unit configured to transmit to the base station an RRC connection request message in which information is included indicating a request for an RRC connection to be established for making a VoLTE call.

User apparatus and indication method for VoLTE communication

There is provided user equipment of a radio communication system including the user equipment, a base station, and a core network apparatus including a reception unit configured to receive information indicating one or more types of NAS protocols supported by the core network apparatus from the base station; a selection unit configured to select a type of a NAS protocol to be transmitted to the core network apparatus based on the information indicating the one or more types of the NAS protocols received by the reception unit; and a transmission unit configured to transmit a NAS message of the type of the NAS protocol selected by the selection unit to the core network apparatus.

User equipment, radio communication system, and communication method

A user device that communicates with a network apparatus and in which at least one application is installed. The user device includes a receiver that receives, from the network apparatus, restriction information including a destination identifier for identifying an external network connected to the network apparatus and a barring rate associated with the destination identifier, and a controller that when communication is to be started by the application, controls whether to allow or prevent the communication by the application based on the restriction information.

User device and restriction method

An object is to provide a mobile station, a mobile communication system, and a network device that can realize more appropriate call origination control per service as intended by an operator. An MMTEL function unit () of a UE (), based on ssac-BarringForMMTEL-Voice, upon determining that call origination of a VoLTE call is possible, transmits Bearer Request to an NAS function unit (). The NAS function unit (), in accordance with the Bearer Request, transmits Service Request to an RRC function unit (). The RRC function unit (), in accordance with the Service Request, based on ac-BarringForMO-Data or Tbarring, transmits RRC Connection Request to a mobile communication network () without determining a possibility of call origination of the VoLTE call.

Mobile station, mobile communication system, and network device

A mobile station for receiving broadcast information for restriction control from a base station in a network environment shared by a plurality of operators includes a reception unit configured to receive from the base station the broadcast information including restriction control skip information indicating a type of a call which is not subject to restriction control; and a restriction control determination unit configured to identify restriction control skip information corresponding to an operator with which the mobile station registers from the received broadcast information and determine whether to apply the restriction control.

Mobile station, base station, restriction control method, and broadcast information transmission method

One aspect of the present invention relates to user equipment supporting an IMS function, comprising: an application layer configured to provide a user interface for a user to set ON or OFF the IMS function; a SIP layer configured to enable or disable transmission of a SIP signal to a resident network corresponding to user's setting ON or OFF the IMS function in the user interface; and a modem layer configured to change an IMS related Capability of the user equipment related to the IMS function corresponding to user's setting ON or OFF the IMS function in the user interface and communicate with the resident network based on the changed Capability.

User equipment, mobile communication system and method

A user apparatus for use in a mobile communication network that supports a plurality of radio access technologies, including: a reception unit configured, when an origination request transmitted to the mobile communication network from the user apparatus that uses a first radio access technology is rejected, to receive an origination rejection signal including a timer value and an operation instruction from the mobile communication network; and an operation control unit configured to perform inhibition of re-origination based on the timer value included in the origination rejection signal that is received by the reception unit, wherein, in a case where the user apparatus changes a using radio access technology from the first radio access technology to a second radio access technology, the operation control unit determines whether to inhibit re-origination based on the operation instruction included in the origination rejection signal.

User apparatus, communication control apparatus, and origination rejection control method

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 () 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.

Communication system, mobile station and communication method

The invention provides a mobile communication system, a mobile station, a call control device, and a mobile communication method that are capable of allowing an emergency call, even to which a prefix indicating how to treat the emergency call is added, to break through access control, and applying priority control to the emergency call, as in the case of a normal emergency call without the addition of the prefix. UE () separates acquired calling number information into a prefix and a calling number, and sends an MSC () an Emergency Setup which includes the prefix and an Emergency Category linked with the calling number. The MSC () determines how to treat the emergency call (such as to block notification of a telephone number of a calling party) based on the prefix included in the Emergency Setup, and connects the emergency call to a PSAP () corresponding to the Emergency Category.

Growing community of inventors

Tokyo, Japan

Shinya Takeda