Patent ID: 9271169
Filing Date: 2016-02-23
CPC Classification: H04W

Claim Text:
1. A method of reporting link failure, comprising: measuring mobility information during a first link between a user equipment (UE) and a serving base station, wherein the mobility information includes one of a user equipment mobility state, a change in the user equipment mobility state, and a user equipment mobility speed when the user equipment mobility state changes; wherein the user equipment mobility state indicates a high-mobility state, a medium-mobility state or a low-mobility state according to how many times a cell re-selection occurs during a predetermined period; wherein the change in the user equipment mobility state is provided by one of (a) measuring a location change of the user equipment during the first link using a global positioning system (GPS), and (b) based on a timing change of the user equipment which is acquired by measuring transmission times of a single-frequency network (SFN) or an orthogonal frequency-division multiplexing (OFDM) during the first link; retaining the mobility information measured during the first link regardless of whether the user equipment has encountered a coverage problem for a predetermined period of time during the first link; establishing a second link between the user equipment and a target base station after a first link between the user equipment and the serving base station fails, wherein the target base station and the serving base station is a same base station; the user equipment reporting the mobility information of the user equipment to the target base station after establishing the second link; when determining that a radio resource control (RRC) connection reconfiguration is received from the serving base station during the first link, the user equipment reporting first information associated with a condition in which the RRC connection reconfiguration is transmitted or received during the first link; and the target base station performing a minimization of drive test (MDT) mobility optimization according to the mobility information and the first information.