Ntt Docomo, Inc.

Nissan Motor Company Limited

Ntt Mobile Communications Network, Inc.

Kazunori Obata

Tadashi Uchiyama

Seigo Harano

Mikio Iwamura

Shogo Yabuki

Takaaki Sato

Yasuhiro Kato

Kenichiro Aoyagi

Seizo Onoe

Yoshihiro Ishikawa

Masafumi Masuda

Akihiro Maebara

Hideyuki Matsutani

Kosuke Fujino

Ryouichi Shimizu

Hiroyuki Ishii

Minami Ishii

Takahiro Hayashi

Junichiro Hagiwara

Yuichiro Nakamura

Naoto Ookubo

Yusuke Sasaki

Yoshitada Sekine

Hiroaki Yamagishi

Kazuyuki Kozu

Kazuyoshi Abe

Akimichi Tanabe

Kota Fujimura

Rie Nagato

Hideyuki Sakuramoto

Yutaka Ohto

Shinji Ueda

Hiroshi Imaizumi

Takuya Takimoto

Tooru Nakamura

Hisashi Shimizu

Shoji Katagi

Naoaki Harada

Kazuya Nomura

Hirotsugu Miura

During a transition procedure from a first communication system to a second communication system, when the priority of a second communication call, whose setup is requested, is the first priority, the second communication system does not set up the bearer of a first communication call between the second communication system and the mobile communication terminal, and notifies the first communication system that the setup of the first communication is not possible, but the setup of the second communication call is possible. When notified that the setup of the first communication is not possible, but the setup of the second communication call is possible, the first communication system aborts the handover procedure, and instructs the mobile communication terminal to switch to the second communication system by another procedure.

Mobile communication system, network device, and mobile communication method

A radio base station in a first mobile communication system is disclosed. The radio base station includes a radio communication unit; a network communication unit; and a determining unit. If a massage received by the network communication unit from a switching station indicates that a mobile station is requesting a service which is not provided in the first mobile communication system but which is provided in, a second mobile communication system and it is determined by the determining unit that a handover to the second mobile communication system cannot be conducted, the network communication unit requests the switching station to release a connection with the mobile station. Then the radio communication unit reports to the mobile station that the connection should be released in accordance with an instruction from the switching station.

Radio base station and method

A radio control base station connected to a plurality of switching centers includes a capacity information receiving unit configured to receive capacity information from at least one of the plurality of switching centers, a load information receiving unit configured to receive load information from at least one of the plurality of switching centers, a selection ratio calculating unit configured to calculate a selection ratio for selecting a connection-target switching center to which a call from a mobile station is to be connected based on the received capacity information and the received load information, and a connection-target switching center determining unit configured to determine the connection-target switching center based on the calculated selection ratio.

Radio control base station and method of determining connection-target switching center

A radio communication system includes at least one user equipment, base stations, and a control station. After expiration of the timer started after establishment of the data bearer, the base station selects the access point base station for the user equipment on the basis of the voice congestion levels and indicates the access point base station to the user equipment if the voice bearer has been established, and selects the access point base station for the user equipment on the basis of the data congestion levels and indicates the access point base station to the user equipment if the voice bearer has not been established.

Radio communication system and base station

A radio base station determines at least any one type of subframe constituted of multiple system information subframes for sending system information to a mobile station, paging subframes for sending paging messages for the mobile station in idle mode, or on-duration subframes corresponding to on-durations at which the mobile station receives downlink control channel signals in discontinuous reception mode for the downlink control channel signals. The radio base station allocates, to the mobile station, inter-frequency measurement periods for inter-frequency measurement at the mobile station, while avoiding simultaneous occurrence of inter-frequency measurement periods and the subframes determined by the subframe determiner.

Radio base station

A base station is disclosed. The base station includes: a reconnection setting information generation unit configured, in a case where handover is requested from a first base station, after a reconnection request signal is received from a mobile apparatus, to generate reconnection setting information to be used for specifying the mobile apparatus; a transmission unit configured to transmit a reconnection request signal to the first base station; a receiving unit configured to receive reconnection setting information to be used for specifying the mobile apparatus from a second base station that is a destination of handover of the mobile apparatus after the second base station receives a reconnection request signal from the mobile apparatus; a reconnection setting information holding unit configured to hold the reconnection setting information; and a connection processing unit configured to perform reconnection processing with the mobile apparatus by using the reconnection setting information held in the reconnection setting information holding unit in accordance with a reconnection request signal from the mobile apparatus after initial connection processing between the second base station and the mobile apparatus.

Base station and method

A base station includes a system information creating unit that creates first system information for barring communication and second system information for not barring; a timing determination unit that classifies user equipment into groups based on timings of the user equipment being in an idle mode to be activated in every discontinuous reception period, and that determines, for each of the groups, a timing of transmitting a paging signal; and a transmitter that transmits the paging signal to the user equipment of some of the groups, and subsequently the first system information; that switches transmission of the first and second system information, so that a ratio between a number of transmitting the first system information and that of the second system information corresponds to a barring ratio; and that transmits the paging signal to the user equipment of the some of the groups, and subsequently the second system information.

Base station and system information notification method

A base station includes a connection processing unit that performs connection processes between user terminals registered in a user terminal registration unit and the base station, and between user terminals other than the user terminals registered in the user terminal registration unit and the base station; a resource amount measurement unit that measures an amount of resources utilized by the base station; and a call disconnection user terminal selecting unit that selects, when the resource amount measurement unit measures that the amount of the resources is greater than or equal to a predetermined threshold value, the user terminal for which a call is to be disconnected, among the user terminals other than the user terminals registered in the user terminal registration unit. The connection processing unit disconnects a connection with the user terminal for which the call is to be disconnected.

Base station, radio communication system, and communication method

A base station includes a radio communication unit () configured to wirelessly communicate with a mobile apparatus capable of communicating in both a first mobile communication system and a second mobile communication system and a network communication unit () configured to communicate with a switching station in the first mobile communication system, and if a line setup instruction signal (Initial Context Setup Request) received at the network communication unit from the switching station is not due to initial access to the switching station by the mobile apparatus, the radio communication unit receives mobile apparatus capability information in the second mobile communication system (UE-UTRA-Capability) from the mobile apparatus after transmitting a line setup response signal (Initial Context Setup Response) to the switching station.

Base station and method to acquire capability of mobile apparatus in mobile communication system

Even when a general user's mobile station in communication enters a use-prohibited cell, the use of the use-prohibited cell is prevented while the communication is being maintained. Regarding a mobile stationthat enters an area of a cell Cunder handover restriction, the connection utilizing the use-prohibited cell is prohibited and handover of the mobile station is performed to an effectively-operating cell Ccovering an area including the current position of the mobile station within the use-prohibited cell and having another frequency. Alternatively, the handover is performed to a base station of an effectively-operating cell Cbelonging to another mobile communication system.

Radio channel controller and radio channel controlling method

A base station apparatus including a reconnection request signal receiving unit configured to receive a reconnection request signal transmitted from a mobile apparatus, the reconnection request signal being for the mobile apparatus requesting reconnection to the base station apparatus, a status detection unit configured to detect whether a status of the mobile apparatus immediately before transmitting the reconnection request signal corresponds to a status where a frequency band measurement period is activated, the frequency band measurement period causing the mobile apparatus to measure a frequency band different from a frequency band for a radio access technology for use in radio communication between the mobile apparatus and the base station apparatus, a response signal generation unit configured to generate a response signal to the reconnection request signal, the response signal generation unit generating, if the status detection unit determines that the frequency band measurement period is activated, the response signal including an indication signal for causing the mobile apparatus to activate the frequency band measurement period and a response signal transmitting unit configured to transmit the generated response signal to the mobile apparatus is disclosed.

Base station apparatus and method

In a mobile communication system, definite resources in radio sectors are allocated to more users in an aspect that the users hardly feel stress during communication. When a call corresponds to an active call based on an active connection request that has been generated by a user's operation (that is, transmitting and obtaining delivery information of pull-type by means of arrows AC, DL or the like), as a trigger, more resources (communication rate is higher) are allocated to the call. When the call corresponds to a non-active call (that is, receiving and obtaining delivery information of push-type by means of an arrow SU or the like), fewer resources (communication rate is lower) are allocated to the call.

Mobile communication system, radio channel controller, mobile station, mobile switching center, and radio channel controlling method

A location registration method according to the present invention, includes: transmitting, at a mobile station (UE), a TA signal, when detecting that the mobile station (UE) has moved out of a TA list with which the mobile station (UE) is already registered by location registration processing; and transferring, from a radio base station (eNB) to an exchange (MME) identified by an exchange ID included in the TAU signal. An exchange ID assigned to a mobile station (#a) belonging to a first layer is different from an exchange ID assigned to a mobile station (#b) belonging to a second layer, even though the same exchange is identified by the exchange IDs. A TA list and a pool area set for the mobile station (#a) is different from a TA list and a pool area set for the mobile station (#b).

Location registration method, mobile communication system and radio base station

A transmission process restriction method according to the present invention includes the steps of transmitting a notification information notifying of a restriction rate for each access class and a restriction rate for each traffic class, causing the mobile station to determine a restriction rate of the mobile station on the basis of the notification information received by the mobile station, an access class of the mobile station, and a traffic class of the mobile station, causing the mobile station to compare a random number generated by the mobile station to the restriction rate of the mobile station, and causing the mobile station to decide whether or not to block the connection request transmission processing in accordance with a result of the comparison.

Transmission process restriction method, mobile communication system, and mobile station

A mobile communication method according to the present invention is to communicate between a mobile station (UE) and a radio base station (eNB) by using a certain key generated using a first key. The mobile communication method includes the steps of: updating, at the mobile station (UE), the first key upon receiving a handover command signal from the radio base station (eNB); transmitting, from the mobile station (UE) to the radio base station (eNB), a handover complete signal by using the certain key generated using the updated first key; and performing, at the mobile station (UE), a cell selection processing when failing to transmit the handover complete signal and detecting a radio link failure, and transmitting, from the mobile station to a selected re-establishment target cell, a re-establishment request signal by using the first key before being updated.

Growing community of inventors

Yokosuka, Japan

Kazunori Obata