公开(公告)号：US20140161044A1

公开(公告)日：2014-06-12

申请号：US14181970

申请日：2014-02-17

Applicant: QUALCOMM INCORPORATED

Inventor： Tao Luo ,  KAPIL BHATTAD ,  XIAOXIA ZHANG ,  TAESANG YOO ,  XILIANG LUO ,  KE LIU

IPC: H04W56/00

CPC classification number: H04W56/001 ,  H04J11/005 ,  H04J11/0069 ,  H04J11/0093 ,  H04W24/02 ,  H04W72/042

Abstract: Methods and apparatus for selecting samples for secondary synchronization signal (SSS) detection are described. Several alternatives are provided for efficient cell identifier detection. In a first alternative, multiple bursts of a signal received from a cell are sampled with non-uniform spacing between sampling intervals to determine a sequence for cell identification. In a second alternative, samples of a first and a second signal received from a stronger cell are cancelled, and a sequence for detecting a weaker cell is determined by reducing effects of the samples of a third signal received from the weaker cell which do not overlap with the primary synchronization signal (PSS) or SSS of the stronger cell. In a third alternative, a sequence for detecting a weaker cell is determined by reducing effects of any sampled bursts that correspond to a high transmission power portion of a signal from a stronger cell.

公开(公告)号：US20180027580A1

公开(公告)日：2018-01-25

申请号：US15499570

申请日：2017-04-27

Applicant: QUALCOMM Incorporated

Inventor： TAESANG YOO ,  Xiaoxia Zhang ,  Jing Sun ,  Siddhartha Mallik ,  Juan Montojo ,  Aleksandar Damnjanovic

IPC: H04W72/12 ,  H04W28/02 ,  H04L5/00 ,  H04W72/08 ,  H04L25/02 ,  H04W72/04

CPC classification number: H04W72/1231 ,  H04B7/024 ,  H04J11/0053 ,  H04L5/0035 ,  H04L5/0053 ,  H04L25/0204 ,  H04W28/0236 ,  H04W72/0413 ,  H04W72/046 ,  H04W72/082

Abstract: Joint aspects of coordinated multiple (CoMP) operations is discussed between multiple entities that may be in different CoMP clusters or even deployed by different operators. Participating base stations obtain channel related information such as sounding reference signals (SRS), channel state information (CSI), and the like from one or more neighbor user equipments (UE) served by a different base station. The base station determines a channel estimate at the neighbor UEs using the channel related information and selects a beamforming vector and schedules downlink transmissions to a served UE based on the channel estimates incorporating the channels of the other neighbor UEs. The selected beamforming vectors and transmission schedules minimizes the interference at the neighbor UEs.

公开(公告)号：US20170295000A1

公开(公告)日：2017-10-12

申请号：US15460079

申请日：2017-03-15

Applicant: QUALCOMM INCORPORATED

Inventor： TAESANG YOO ,  ZHIFEI FAN ,  WEILIANG ZENG ,  JING SUN ,  JUAN MONTOJO

IPC: H04L5/00 ,  H04L27/26 ,  H04B17/336

CPC classification number: H04L5/0048 ,  H04B17/336 ,  H04J13/004 ,  H04L5/0007 ,  H04L5/0026 ,  H04L5/005 ,  H04L5/026 ,  H04L27/2613 ,  H04L27/2636

Abstract: Methods, systems, and devices for wireless communication are described. A base station may multiplex reference signal (RS) transmissions for different antenna ports over a set of resource elements using a code division multiplexing (CDM) group spreading in a time dimension and a frequency dimension. The base station may transmit the RS transmissions over the set of resource elements based at least in part on the multiplexing to a user equipment (UE). The UE may demultiplex the RS transmissions based at least in part on a CDM group and may select at least one of the time dimension or the frequency dimension over which to demultiplex the RS transmissions based on a determination or other information.