Hitachi, Ltd.

Michihiro Asanuma

Akio Kawase

Takaaki Suzuki

Tadashi Shimizu

Masao Hayama

Eiichiro Takizawa

Kiyoshi Ichikawa

Yi Lou

Kiyotaka Kataoka

Jumpei Watanabe

Call connection processing is performed and a message is processed in a different subnet without UATI reassignment and takeover of a wireless session. RANs that belong to different subnets and are adjacent to each other use messages to exchange ColorCode, IP addresses of base station controllers, wireless resource information of base station transceiver subsystems and the like. When the RAN receives, from an AT, a message having ColorCode that is different from ColorCode of the RAN, the RAN transfers the message to a base station controller included in the RAN having ColorCode that matches the ColorCode included in the message.

Base station controller and wireless packet processing device

The present invention provides with a terminal having a monitoring period changing function for changing the value (monitoring period) of a no-traffic monitoring timer of the terminal by feeding back the information on radio signal conditions, and a no-traffic monitoring function for changing the status of the call of the terminal to 'a disconnected state for only receiving radio signal from a base station' depending on the value (monitoring period) of the no-traffic monitoring timer based on the information fed back.

Wireless communication terminal automatically controlling non-communication monitoring timer

In a base station controller for controlling the operation of a base station for executing call control which permits a connection in response to a connecting request from a radio terminal, when a stop instruction of the call control of the base station is received, the number of radio terminals which can be connected to the base station is decreased and thereafter the call control is stopped, and when the call control of the base station is restarted, the number of radio terminals which can be connected to the base station is increased.

Base station controller and method for restricting access

When measurement results of received radio wave intensities of wireless base stations, which demands a soft handoff, are received from a wireless terminal in a wireless communication system and when a base station controller attempts to acquire a traffic channel in a wireless base station, via which a wireless communication path will be added, in the state in which the channel resource usage rate of that wireless base station is over a threshold, a traffic channel may be acquired only if the ratio between the radio wave intensity of the wireless base stations establishing communication paths and the radio wave intensity of the wireless base station via which a communication path will be added is higher than a threshold or if the difference between the radio wave intensity of the wireless base stations and the radio wave intensity of the wireless base station smaller than a threshold.

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Chigasaki, Japan

Michihiro Asanuma