公开(公告)号：US20180176065A1

公开(公告)日：2018-06-21

申请号：US15735327

申请日：2016-06-24

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Tao Deng ,  Steven Ferrante ,  Ravikumar V. Pragada ,  Yugeswar Deenoo ,  Daniel R. Cohen ,  Janet A. Stern-Berkowitz ,  Moon-il Lee ,  Mihaela C. Beluri

IPC: H04L27/26 ,  H04W48/16 ,  H04W56/00 ,  H04B7/08 ,  H04W48/12 ,  H04B7/06

CPC classification number: H04L27/2673 ,  H04B7/0617 ,  H04B7/0695 ,  H04B7/088 ,  H04L27/2666 ,  H04W48/12 ,  H04W48/16 ,  H04W56/001

Abstract: Methods and apparatus for initial cell search and selection using beamforming are described. An apparatus is configured with multiple receive beams and includes an antenna and a processor. The processor is operatively coupled to the antenna and sweeps a respective one of the multiple receive beams during each of multiple synchronization sub-frames, using a pre-defined sweep time and dwell period, to detect a synchronization signal. The processor also obtains symbol timing information and a synchronization signal index from the detected synchronization signal. The obtained synchronization signal index corresponds to a synchronization signal index of the set. The process decodes a first broadcast channel using the obtained symbol timing information, the obtained synchronization signal index and a predefined or blind-coded symbol distance between the detected synchronization signal and the first broadcast channel. The process decodes a second broadcast channel using information obtained from decoding the first broadcast channel.

公开(公告)号：US20240146598A1

公开(公告)日：2024-05-02

申请号：US18545663

申请日：2023-12-19

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Tao Deng ,  Steven Ferrante ,  Ravikumar V. Pragada ,  Yugeswar Deenoo ,  Daniel R. Cohen ,  Janet A. Stem-Berkowitz ,  Moon-il Lee ,  Mihaela C. Beluri

IPC: H04L27/26 ,  H04B7/06 ,  H04B7/08 ,  H04W48/12 ,  H04W48/16 ,  H04W56/00

CPC classification number: H04L27/2673 ,  H04B7/0695 ,  H04B7/088 ,  H04W48/12 ,  H04W48/16 ,  H04W56/001 ,  H04B7/0617 ,  H04L27/2666

Abstract: A method performed by a wireless transmit/receive unit (WTRU) may include receiving a configuration message including timing information for monitoring at least a subset of a plurality of beams to receive a set of synchronization signals and receiving the set of synchronization signals based on the timing information. The received set of synchronization signals include a primary synchronization signal and a secondary synchronization signal. The method may include receiving a reference signal along with a physical broadcast channel (PBCH) transmission. The reference signal comprises a sequence that is derived from an index associated with one of the at least the subset of beams and associated with the received set of synchronization signals. The method may include transmitting a random access channel (RACH) transmission. The RACH transmission includes a preamble sequence corresponding to the one of the subset of the plurality of beams.

公开(公告)号：US11848811B2

公开(公告)日：2023-12-19

申请号：US17746680

申请日：2022-05-17

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Tao Deng ,  Steven Ferrante ,  Ravikumar V. Pragada ,  Yugeswar Deenoo ,  Daniel R. Cohen ,  Janet A. Stern-Berkowitz ,  Moon-il Lee ,  Mihaela C. Beluri

IPC: H04L27/26 ,  H04W48/02 ,  H04W48/06 ,  H04B7/06 ,  H04B7/08 ,  H04W56/00 ,  H04W48/12 ,  H04W48/16

CPC classification number: H04L27/2673 ,  H04B7/0695 ,  H04B7/088 ,  H04W48/12 ,  H04W48/16 ,  H04W56/001 ,  H04B7/0617 ,  H04L27/2666

Abstract: A method performed by a base station may include transmitting a configuration message including at least information indicating a subset of a plurality of transmit beams to be used for transmitting a set of synchronization signals. The set of synchronization signals including a primary synchronization signal and a secondary synchronization signal may be transmitted. A random access channel (RACH) transmission may be received using a receive beam associated with one of the subset of the plurality of transmit beams used by the base station to transmit the set of synchronization signals. The transmitted set of synchronization signals transmitted may have a signal quality above a signal quality threshold. A reference signal may be transmitted along with a physical broadcast channel (PBCH) transmission. The reference signal may have a sequence derived from a beam index associated with the one of the subset of the plurality of transmit beams.