公开(公告)号：US09819457B2

公开(公告)日：2017-11-14

申请号：US14846002

申请日：2015-09-04

Applicant: APPLE INC.

Inventor： Zu Ji ,  Johnson O. Sebeni ,  Yu-Lin Wang

IPC: H04Q7/00 ,  H04L5/00 ,  H04B17/309

CPC classification number: H04L5/0007 ,  H04B17/309 ,  H04L5/0048 ,  H04L5/0053

Abstract: A user equipment and method performs an adaptive channel estimation. The method performed at a user equipment includes receiving physical downlink control channel (PDCCH) information for a subframe from a network, the subframe including reference symbols at predetermined times therein. If the PDCCH information does not include a downlink grant for the user equipment, a measured value of a network metric experienced by the user equipment is determined and compared to a threshold criteria. A first set of the reference symbols is used for channel estimation when the threshold value is satisfied and a second set of the reference symbols is used for channel estimation when the threshold is not satisfied, the first set of references symbols is a subset of the second set of the reference symbols. In another embodiment, a previously determined channel estimation at a previous subframe is used for the subframe when the threshold is satisfied.