Method and arrangement for supporting handover of a mobile terminal in certain scenarios

摘要

Method and arrangement in a mobile terminal in a wireless communication system, for supporting a handover from a serving cell to a target cell. The method comprises determining 104a if the mobile terminal has moved in a predefined way in relation to at least one potential target cell. The determining is based on Doppler shift measurements 102a. The method further comprise adjusting 106a at least one handover related parameter, in order to enable a fast handover, when it is determined that the mobile terminal has moved in the predefined way in relation to the at least one potential target cell.

主权项

1. A method in a mobile terminal in a wireless communication system, for supporting a handover from a serving cell to a target cell, the method comprising:
determining whether the mobile terminal has moved in a predefined way in relation to a potential target cell, based on a sequence of two or more Doppler shift measurements, wherein said determining comprises
determining whether a received signal power from the potential target cell exceeds a first predetermined threshold according to a first criterion,measuring a Doppler shift related to said potential target cell,determining whether the absolute value of the measured Doppler shift is below a second predetermined threshold according to a second criterion,adding a potential target cell for which the first and second criterion are fulfilled to a list, anddetermining whether the absolute value of the measured Doppler shift related to each of the cells in the list, respectively, exceeds a third predetermined threshold, which is higher than the second threshold; and adjusting a handover related parameter, in order to enable a handover, in response to a determination that the mobile terminal has moved in the predefined way, wherein said adjusting comprises changing the handover related parameter in response to determining that the Doppler shift related to any of the cells in the list exceeds the third threshold.