Ntt Docomo, Inc.

Nippon Telegraph and Telephone Corporation

Nippon Electric Co., Ltd.

Nippon Telegraph and Telephone Public Corporation

Takanori Utano

Narumi Umeda

Seizo Onoe

Shinji Uebayashi

Takaaki Sato

Masafumi Masuda

Yuichiro Nakamura

Tomoyuki Yamada

Toshiyuki Futakata

Yoshikazu Takayama

Masayuki Sakamoto

Osamu Nakamura

Naoto Shimada

Yoshinobu Fukumine

A mobile communication method according to the present invention includes a step A of offering a particular service through a second radio data link established between a mobile station and a cell in the second area in a state in which a first radio data link is not established between the mobile station and a cell in the first area and a step B of suspending the offer of the particular service through the second radio data link when the state in which the first radio data link is not established continues for a predetermined time period.

Mobile communication method, radio control station, and radio base station

A mobile station receives a signal based on a TDD method by receiving a signal based on a FDD method to acquire information of the signal based on the TDD method in a mobile communication system. For instance, the mobile station receives a signal based on a CDMA-FDD method. Then, the mobile station acquires information (e.g. information relating to a code, a frequency and a timing) of a signal based on a CDMA-TDD method from the signal based on the CDMA-FDD method. Then, the mobile station receives the signal based on the CDMA-TDD method on the basis of the acquired information.

Mobile station, base station and communication method

In a communication channel set up method, the utilization state of a prescribed frequency in the first frequency band that causes interferences to the first communication system when the communication channel of a particular frequency in the second frequency band is used at the second communication system is detected, and if the prescribed frequency in the first frequency band is currently used, the communication channel other than that of the particular frequency is allocated to the second communication system.

Communication channel set up method and communication control device for reducing interferences between radio communication systems

Method and apparatus for locating which zone and sector of a mobile

Respective location registration areas (A, B, C,) in a mobile communication network include a plurality of base station service areas (a.sub.1 -a.sub.n, b.sub.1 -b.sub.n, c.sub.1 -c.sub.n). By partially overlapping the respective location registration areas, each of the respective base station service areas, for instance, (b.sub.23, c.sub.23) belong to a plurality of location registration areas (B, C). The respective base station (b.sub.23, c.sub.23) transmits all the location registration codes (B, C) together with one designated primary location registration area code (B) to be selected by a mobile station. The mobile station begins communication after registering the designated area code. When, during communication, the mobile station moves beyond the location registration area boundary, no registration is updated so long as the mobile station stays within communication with a base station transmitting the designated registered area code. When the mobile station moves out of the base station area, the registration code is updated to a new location registration area. Accordingly, the number of location registration updates due to movement of the mobile station near the boundary of location registration areas is decreased in comparison with a conventional method.

Method for registering mobile station in mobile communication system

A mobile radio communication system utilizes message channels of the same frequencies in separate geographic zones. Also, zones utilizing the same message channels are assigned distinguishing control codes which are transmitted with control signals to prevent control signals related to one zone from interfering with communications with another zone using the same message frequencies.

Mobile radio communication control system for preventing erroneous

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Yokohama, Japan

Takanori Utano