Ntt Docomo, Inc.

Yamatake-honeywell Co., Ltd.

Shinichi Mori

Takatoshi Sugiyama

Hiroyuki Hosono

Akira Ishii

Tetsuro Imai

Mikio Iwamura

Narumi Umeda

Ichiro Okajima

Yoshihiro Ishikawa

Yuki Inoue

Kei Igarashi

Keizo Cho

Tomoyuki Ohya

Kengo Yagyu

Tomoyuki Ooya

Masumi Kiikuniya

Mamoru Maekawa

A disclosed base station includes a communication unit configured to receive from a mobile station a first report signal including base station specification information specifying a base station, reception quality information indicating reception quality of a signal received from the specified base station, and change request information requesting to change communication quality between the mobile station and the specified base station; and an automatic area control unit configured to determine whether the base station is specified by the base station specification information, to obtain location information indicating the location of the mobile station if the base station is specified by the base station specification information, and to change at least one base station parameter based on the reception quality information and the location information to change the reception quality at the location of the mobile station.

Mobile station, base station, and area shaping method performed by specified base station

A mobile communication system includes a condition reporting unit provided in a base station controller and configured to report to a mobile station via the target base station or another base station measurement and report conditions for determining whether to measure and report a reception quality level of a radio signal transmitted from the target base station; a measurement reporting unit provided in the mobile station and configured to measure the reception quality level of the radio signal if the measurement condition is satisfied and to report the measured reception quality level to the base station controller via the target base station or the other base station if the report condition is satisfied; and a radio parameter control unit provided in the base station controller and configured to control a radio parameter of the target base station or the other base station based on the reported reception quality level.

Mobile communication system, base station controller, base station, mobile station, and base station radio parameter control method

In a mobile communication system including a certain user targeted base station (Home eNB), fast cell search and handover are achieved without unnecessary signaling and without increasing interference with other cells. In the mobile communication system, when it is detected that a mobile station permitted to access the certain user targeted base station has entered or exists within a location registration area associated with the certain user targeted base station, connection information including at least frequency information being presently used by the certain user targeted base station and ID information for the certain user targeted base station is transmitted to the mobile station in a dedicated manner. The mobile station performs cell search based on the transmitted connection information. In a preferred embodiment, the mobile station receives adjacent cell frequency information broadcast from a resident public targeted base station and performs the cell search based on the frequency information in the transmitted connection information as well as the adjacent cell frequency information.

Connection control method for mobile communication, mobile communication management apparatus and mobile station apparatus

A mobile communications system is disclosed. The mobile communications system includes a first unit, provided at a base station apparatus, which controls a base station status by determining a request from an upper-layer general base station apparatus; and a second unit, provided at the general base station apparatus, which monitors for one or more mobile station apparatuses entering into/appearing in, or exiting/disappearing from a cell formed by the general base station apparatus, and, if at least one of the mobile station apparatuses enters into/appears in the cell formed by the general base station apparatus, requests for changing the base station apparatus to a service status, and, if all of the mobile station apparatuses exit/disappear from the cell formed by the general base station apparatus, requests for changing the base station apparatus to a radio unit stop status.

Mobile communications system, general base station apparatus, base station apparatus, and base station status control method

In a mobile communication system including Home eNBs, information on mobile stations permitted to access each Home eNB can be easily registered, and the permitted mobile stations can be connected to the Home eNB substantially at the same time of the registration of the access permission. In order to control access to a certain user targeted base station, the information on mobile stations permitted to access the certain user targeted base station is supplied to the certain user targeted base station. Then, the information on the access permitted mobile stations is transmitted to a mobile communication management apparatus on a network. The access permitted mobile station registration is stored in the mobile communication management apparatus in association with the certain user targeted base station. When the access permitted mobile station has entered a location registration area covering the certain user targeted base station or exists in the location registration area, the mobile communication management apparatus transmits connection information for the certain user targeted base station to the mobile station.

Access control method for certain user targeted base station, base station apparatus and mobile communication management apparatus

A mobile communication system includes an association requesting unit provided in a base station and configured to request a base station controller, which is an upper node, to associate the base station with a tracking area; and a state control unit provided in the base station controller and configured to monitor entry or appearance and exit or disappearance of mobile stations in and from the tracking area associated with the base station, to cause the base station to transition to a serving state if at least one of the mobile stations enters or appears in the tracking area, and to cause the base station to transition to a radio-unit-inactive state if all of the mobile stations exit or disappear from the tracking area.

Mobile communication system, base station controller, base station, and base station state control method

A radio communication control device includes a radio parameter update determination portion, a transmission power value change portion and a radio parameter update portion. The radio parameter update determination portion determines whether or not to update a radio parameter relating to at least one of a communication frequency and transmission power to a new radio parameter. The transmission power value change portion performs a transmission power change process to change a transmission power value during data transmission to a radio communication station to a smaller value in stages at predetermined intervals when the radio parameter update determination portion determines to update the radio parameter to the new radio parameter. A radio parameter update portion updates the radio parameter to the new radio parameter when the transmission power value change portion changes the transmission power value to a preset lower limit or less.

Radio communication control device, radio communication control system, and radio communication control method

A wireless control apparatus is disclosed that forms and controls an area of a base station according to an antenna pattern. The wireless control apparatus includes an area formation information gathering part that gathers area formation information pertaining to area formation of a neighboring base station; and an antenna pattern control part that controls and directs at least one of a main lobe, a side lobe, and a null point between the main lobe and the side lobe of the antenna pattern based on the area formation information to reduce frequency interference between a current cell formed by a current base station and a neighboring cell formed by the neighboring base station.

Wireless control apparatus and communication method

To automatically set up temporarily the parameters required for radio communication, based on the parameters acquired from another base station apparatus existing in the neighborhood. A pair of base station identifier and down scrambling code reported from a base station apparatus in the neighborhood is acquired. The non-overlapping down scrambling code is set to a newly established base station apparatus based on the acquired contents. Whether or not the base station apparatus is located in the neighborhood is judged according to at least one of the Hop number and the required arrival time on a communication path up to the base station apparatus.

Base station apparatus and radio communication parameter setting method

A base station and a scrambling code setting method of automatically setting up a scrambling code, the base station including a scrambling code setting unit for setting up a base station identifier and a provisional downlink scrambling code that is provisionally assigned; and a transmitting unit for spectrum-spreading the base station identifier by the provisional scrambling code, and for transmitting the base station identifier; wherein the scrambling code setting unit assigns a lasting downlink scrambling code based on a report concerning reception of the base station identifier.

Base station, and a scrambling code setting method

A communication control device is provided which efficiently utilizes wireless resources to improve communication quality and system throughput by appropriately setting and performing node transmission power. The communication control device in a wireless LAN system includes a sender, a receiver, and an inter-AP communication functionfor determining, based on at least one of wireless information obtained by measurement of a wireless signal by an access pointor a station, or reported wireless information, whether or not there is a neighboring BSS, and a transmission power determination functionand a transmission power setting/update functionfor setting and updating the transmission power of the access pointand the stationin its own BSS when there is a neighboring BSS in which all the access point have the control function of the transmission power, on the other hand, for maximizing the transmission power when there is no neighboring BSS or when there is a neighboring BSS that does not control the transmission power.

Communication control device and communication control method

A base station and method of communication of a base station is provided. The base station includes a storage configured to store a predetermined number of base station information, each including a base station ID, an acquisition unit configured to acquire base station IDs, an aggregating unit configured to aggregate a number of times that each of the base station IDs is acquired, and a determination unit configured to determine a priority of each of the base station IDs. The base station also includes a judging unit configured to judge whether or not there is a base station ID having a priority higher than the base station ID stored in the storage, and a manager configured to delete from the storage, and store in the storage, base station information including a base station ID.

Base station and communications method for storing base station information including a base station ID

Disclosed is a radio base station including: a common control channel transmission unit configured to transmit a common control channel by using radio communications parameter to be assigned to each radio base station; a transmission level determination unit configured to transmit the common control channel according to a predetermined transmission pattern; a reception level supervision unit configured to acquire a reception level of the common control channel received by a mobile station; and an overlap determination unit configured to determine whether or not the predetermined radio communications parameter overlaps with a radio communications parameter used in a different radio base station based on the reception level acquired by the reception level supervision unit and the predetermined transmission pattern.

Radio base station and method of detecting overlap of radio communications parameter

To provide a base station apparatus that can automatically update the parameters required for radio communication. A pair of identifier for identifying the self station and radio communication parameter is notified to another base station existing in the neighborhood of the self station, and the path loss value between another base station and a mobile station and the pair of identifier and radio communication parameter for another base station is acquired. The pair of identifier and radio communication parameter reported by the self station is set and updated, based on this acquired information. Since it is updated in consideration of the path loss value reported from the mobile station, the parameter can be updated at higher precision.

Growing community of inventors

Yokohama, Japan

Shinichi Mori