Ntt Docomo, Inc.

Hiroyuki Hosono

Takeshi Okamoto

Shinichi Mori

Takeshi Terayama

Masafumi Masuda

Kenichiro Aoyagi

Akira Ishii

Takatoshi Sugiyama

Takaaki Sato

Yuki Inoue

Yasuhiro Kawabe

Kei Igarashi

Keizo Cho

Wuri Andarmawanti Hapsari

Minami Ishii

Takahiro Hayashi

Hideaki Takahashi

Takao Someya

Takefumi Yamada

Atsushi Fukuda

Hidehiko Oyane

Shogo Yabuki

Rie Nagato

Masayuki Matsubara

Takayuki Tsuneda

Tsutomu Sugaya

A radio base station apparatus including a function for determining a transmission power, including: a neighbor cell detection unit configured to detect a neighbor cell that interferes with a target cell that the radio base station apparatus can form; a received power measurement unit configured to measure, for each neighbor cell detected by the neighbor cell detection unit, a received power from the neighbor cell; and a transmission power determination unit configured to calculate, for each band part that overlaps with a transmission band of the radio base station apparatus in transmission bands of each neighbor cell, a sum of received powers for neighbor cells having transmission bands each including the band part, and to determine an interference amount in the target cell based on the sum of received powers so as to determine the transmission power by using the interference amount.

Radio base station apparatus, and transmission power determination method

A radio access device includes a controller signal processing unit (RNSAP unit) that processes a signal exchanged with a radio network controller (RNC); and a switching center signal processing unit (RANAP unit) that processes a signal exchanged with a switching center. The RNSAP unit requests to establish a communication path between the radio access device and the RNC and a communication path between the RNC and a BTS by transmitting a request signal to the RNC. Subsequent to receiving an acknowledgement signal corresponding to the request signal from the RNC, the RANAP unit requests to establish a communication path between the switching center and the RNC. Subsequent to receiving, by the RANAP unit, an acknowledgement signal corresponding to the request signal from the switching center, a communication path between the radio access device and the UE is released.

Radio access device and handover method

A radio network controller includes an acquisition unit configured to acquire a radio communication state of a neighboring cell located around a cell formed by a base station which the mobile station camps on among base stations, and a level determination unit configured to determine the in-out reception level based on an acquisition result of the radio communication state by the acquisition unit. The level determination unit calculates an estimated reception level of the radio channel in a reception level tie point P in which the reception level of the radio channel transmitted by a base stationand the reception of the radio channel transmitted by a target base stationbecome substantially equal to each other, and determines the in-out reception level based on the calculated estimated reception level &#x3b1;.

Mobile communication system, base station, and mobile communication method

A base station in a mobile communication system transmits and receives wireless signals with a user apparatus in a cell; in the case where the base station is connected to a communication network through a router, obtains an address of the router; periodically receives time information from a time information server through the communication network; stores in a memory unit the router's address and a current time indicated by the time information; and () in the case where a current-time-storing-is-stopped period is equal to or greater than a threshold value, or () in the case where the current-time-storing-is-stopped period is less than the threshold value and is equal to or greater than another threshold value, and an address just received from the router is different from the address stored in the memory unit, transmits a control signal for stopping the transmission of the wireless signal.

Base station in mobile communication system and wave stopping method

A mobile communication systemincludes a selection unitconfigured to select a transition target frequency from the plurality of frequencies when a condition under which a mobile communication terminal not utilize a transition source frequency being any of the plurality of frequencies is fulfilled, and an instruction unitconfigured to instruct the mobile communication terminal to perform a transition to the transition target frequency selected by the selection unit. The selection unitexcludes the transition source frequency from a frequency candidate to be utilized by the mobile communication terminal until an elapsed time after the instruction of the transition to the transition target frequency exceeds a predetermined time.

Mobile communication system, network apparatus, and mobile communication method

A radio controllerincludes a transmission power acquisition unitconfigured to acquire a neighboring cell transmission power value that is a transmission power value of a radio signal transmitted from a base station forming the neighboring cell, an offset determination unitconfigured to determine a power offset of the neighboring cell to be added to the predetermined transmission power value, based on a difference between the predetermined transmission power value and the neighboring cell transmission power value acquired by the transmission power acquisition unit, and an offset notification unitconfigured to notify the power offset determined by the offset determination unit to the mobile station.

Mobile communication system, radio controller, base station, and mobility control method

A radio base station according to the present invention includes a common control information acquisition unitto acquire common control information broadcast by a first neighboring radio base station; a neighboring radio base station information acquisition unitto acquire radio base station information held by a second neighboring radio base station via a wired network; and a communication parameter determination unitto determine a communication parameter to be used based on a first communication parameter, a second communication parameter, and a third communication parameter, the first communication parameter included in the acquired common control information and used by the first neighboring radio base station, the second communication parameter included in the acquired common control information and used by a radio base station neighboring the first neighboring radio base station, the third communication parameter included in the acquired radio base station information and used by the second neighboring radio base station.

Radio base station and mobile communication method for determining a communication parameter

A radio controllerincludes an acquisition unit configured to acquire a radio communication state of a neighboring cell around the cell formed by a base station, and a threshold determination unit configured to determine an in-out threshold based on an acquisition result of the radio communication state by the acquisition unit. The threshold determination unit calculates an estimated overall reception level within a frequency band at a point at which the reception level of the common control channel transmitted by the base stationbecomes the highest in the cell formed by the base station, based on the reception level of the common control channel and the overall reception level, and determines the in-out threshold based on the calculated estimated overall reception level.

A mobile communication method comprises a step in which a first radio base station, finds another radio base station provided in a particular user network when provided in the particular user network; a step in which the first radio base station and the other radio base station found thereby constitutes a group; a step in which a number of mobile stations that can be connected to the group at the same time is decided; and a step in which the number of mobile stations connected at the same time to the first radio base station and other radio base station belonging to the group is restricted based on the decided number of mobile stations that can be connected at the same time.

Mobile communication method and network apparatus

A mobile communication method according to the present invention includes: a step in which a mobile station UE transmits 'Measurement Report' including identification information 'ECGI' on a cell subordinate to a radio base station eNB, to a radio base station HeNB; a step in which a radio base station HeNB transmits &#x201c;(X2) HO Request&#x201d; including the identification information &#x201c;ECGI&#x201d; of the cell subordinate to the radio base station eNB, to an IP address of a gateway device HeNB-GW; and a step in which the gateway device HeNB-GW transfers the &#x201c;(X2) HO Request&#x201d; to the IP address corresponding to the identification information &#x201c;ECGI&#x201d; on the cell subordinate to the radio base station eNB.

Mobile communication method and radio base station

A mobile communication method according to the present invention includes step A of notifying, by a radio base station NodeB, a radio network controller RNCof location information of the radio base station NodeB (location code: bbb), step B of notifying, by the radio network controller RNC, an exchange station MSC/SGSN of the location information of the radio base station NodeB (location code: bbb) when a mobile station UE starts communication via the radio base station NodeB and the radio network controller RNC, and step C of controlling each session of the communication by the exchange station MSC/SGSN based on the location information of the radio base station NodeB (location code: bbb).

Mobile communication method, radio base station, radio network controller, and exchange station

A base station outputs annunciation information which corresponds to a plurality of radio cells established by a 3G public base station and an LTE public base station and which is different from annunciation information output from the 3G public base station and the LTE public base station into a target region X and forms a radio cell. A mobile station that enters the radio cell receives the annunciation information of the radio cell and executes a position registration process. An information administration device can thereby find the mobile station based on the position registration process even in the environment where a plurality of radio cells to which different frequencies are assigned are established geographically overlapping with one another.

User information administration system and user information administration method

A radio base station monitoring method includes (A) a first radio base station detecting a second radio base station having newly detected a common control channel and a second radio base station having stopped detecting the common control channel as second radio base stations with a change, (B) the first radio base station notifying a network device of information about the second radio base stations with a change, and (C) the network device using information about second radio base stations associated with the first radio base station and the information about the second radio base stations with a change, which has been notified, to stop the operation of at least one of the first radio base station or the second radio base stations.

Network device to monitor radio base station and a method thereof

A home radio base station according to the present invention includes a receiving unitconfigured to receive notification information in peripheral cells of the same radio communication scheme as that of the home radio base station, an acquiring unitconfigured to acquire operational frequencies in the same radio communication scheme as that of the home radio base station, from the received notification information, and a determining unitconfigured to determine an operational frequency for the home radio base station, from the acquired operational frequencies.

Mobile communication system, home radio base station, and operational frequency determination method

A mobile communication method according to the present invention includes step of managing identification information on a radio base stationand identification information on an information transfer devicein association with each other in a radio base station managerby a network device, step of transmitting, when the radio base stationis moved, an installation signal from the radio base stationto an information transfer deviceto which the radio base station is connected, step of transferring the received installation signal from the information transfer deviceto which the radio base station is connected to the network device, and step of detecting by the network devicean unauthorized moving of the radio base station, in a case where the network device determines by referring to the radio base station information manager that the identification information on the radio base station included in the received installation signal and the identification information on the information transfer device to which the radio base station is connected are not managed in association with each other.

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Yokohama, Japan

Hiroyuki Hosono