Ntt Docomo, Inc.

Takayuki Tsuneda

Takaaki Sato

Masafumi Masuda

Hiroyuki Hosono

Takeshi Terayama

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 UEincludes a storage unitconfigured to store a specific cell accessible by the mobile communication unit and a neighboring cell element for identifying a neighboring cell provided around the specific cell, while associating the specific cell and the neighboring cell element with each other, a search unitconfigured to search for the specific cell accessible, and a registration unitconfigured to register a element for identifying a transition source cell as the neighboring cell element, when the UEis transitioned from the transition source cell to the specific cell stored in the storage unit

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Chiyoda-ku, Japan

Takayuki Tsuneda