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US 8,412,181 B2Granted
Mobile station
AssigneeNtt Docomo, Inc.
InventorsItsuma Tanaka, Yasuhiro Kato, Mikio Iwamura, Masashi Kanauchi
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Abstract
In a mobile station (UE) according to the present invention, an AS function is configured to notify, when detecting a failure in a radio link established with the radio base station is detected or when discovering a cell subject to a location registration by a cell selection process, a NAS function of the detection or the discovery; and the NAS function is configured to transmit, in response to the notification, a location registration request signal to a mobile switching center (MME).
Claims2
A mobile station comprising:
- an AS (Access Stratum) function corresponding to an AS terminated between the mobile station and a radio base station;
- and
- an NAS (Non Access Stratum) function corresponding to an NAS terminated between the mobile station and a mobile switching center,
- wherein
- the AS function is configured to activate a first timer, when a quality deterioration of a radio link established with the radio base station is detected;
- the AS function is configured to detect a failure in the radio link and to activate a second timer, when the quality deterioration of the radio link is not recovered before the first timer expires;
- the AS function is configured to transition to an idle state, when a specific cell is discovered during a time that the second timer is activated, and when the AS function attempts to establish a radio link with a radio base station that manages the specific cell and the establishment of the radio link is failed, and to notify, to the NAS function, the failure;
- and
- the NAS function is configured to transmit, in response to the notification, a location registration request signal to the mobile switching center.
6 more elements
Dependencies are inferred from the claim text.