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US 2011/0237245 A1Published application
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).
Claims3
A mobile station comprising:
- a first protocol function corresponding to a first protocol terminated between the mobile station and a radio base station;
- and
- a second protocol function corresponding to a second protocol terminated between the mobile station and a mobile switching center, wherein
- the first protocol 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 first protocol 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 first protocol 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 first protocol 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 second protocol function, the failure;
- and
- the second protocol function is configured to transmit, in response to the notification, a location registration request signal to the mobile switching center.
5 more elements
Dependencies are inferred from the claim text.