Qualcomm Incorporated

Nokia Corporation

Jigneshkumar P Shah

Ming-Chang Tsai

Kanu Chadha

Rajat Prakash

Luca Blessent

Mark S Wallace

Andrei Dragos Radulescu

Srikant Jayaraman

Mohamad Sayed Hassan

Abhishek Saurabh Sachidanand Sinha

Michael Francis Garyantes

Pillappakkam Bahukutumbi Srinivas

Fenghua Liu

Li Pan

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a radio unit (RU) may receive, from a user equipment (UE), a demodulation reference signal (DMRS) associated with a channel. The RU may perform a channel estimation associated with the channel using the DMRS to obtain channel estimation information. The RU may transmit, to a distributed unit (DU), information that is based at least in part on the channel estimation information. Numerous other aspects are described.

Enhanced fronthaul interface split using demodulation reference signal channel estimates

An apparatus and method for estimating velocity and Doppler frequency comprising acquiring a first plurality of time-of-arrival (TOA) measurements from a first plurality of base stations at a first time; acquiring a second and a third plurality of TOA measurements from a second and third plurality of base stations at a second time and a third time; determining a plurality of line-of-sight distance measurements using the first, second and third pluralities of TOA measurements; determining a plurality of velocity estimates and a plurality of angle of arrival (AOA) estimates, using the plurality of LOS distance measurements; determining a plurality of Doppler frequency estimates using the plurality of velocity estimates and the plurality of AOA estimates; and using a processor for determining an average Doppler frequency estimate over a plurality of sectors, wherein the first, second and third pluralities of TOA measurements are acquired over the plurality of sectors.

Apparatus and method for multi-sector velocity mobile velocity and doppler estimate for synchronous communication systems

An apparatus and method for non-exclusive multiplexing of at least one active control channel comprising preparing the at least one active control channel for transmission in a next frame using a transmitter data processor; assessing channel robustness of the at least one active control channel based on a channel robustness threshold; and if the channel robustness threshold is not met, performing constellation control or power control on the at least one active control channel which is active prior to transmitting the at least one active control channel; or if the channel robustness threshold is met, transmitting the at least one active control channel using a transmitter.

Apparatus and method for channel error control of non-exclusive multiplexing for control channels

A method is provided for compensating for clock drift error and movement error of an access terminal. A forward link error is obtained that is attributable to at least a first error (e.g., clock drift error) component and a second error (e.g., movement error) component. The first error component and the second error component are estimated based on the obtained forward link error. A receive clock of the access terminal is compensated based on a combination of the first error component and the second error component. A transmit clock of the access terminal is compensated based on a difference between the first error component and the second error component. The forward link error may include a timing synchronization error between the access terminal and an access point as well as a frequency synchronization error between a forward link frequency and a baseband reference frequency.

Motion-aware mobile time and frequency tracking

Provided are improved systems and methods for spread spectrum communication employing hybrid Eb/No and pilot-based finger lock determination for RAKE receivers. Finger lock thresholds are periodically set using an extended time-averaged Eb/No traffic signal estimate for each finger mapped to an Ec/No pilot level, where the extended time-averaged Eb/No estimate is inversely proportional to the mapped Ec/No level, thus, decreasing the required Ec/No level when the Eb/No estimate increases and increasing the required Ec/No level when the Eb/No estimate decreases. Existing pilot-based finger lock algorithms may be used with the Ec/No threshold set using the extended time-averaged Eb/No estimate. When pilot signals are weak but traffic signals remain strong, fingers will remain locked to increase the combiner output signal-to-noise ratio.

Apparatus and method for hybrid traffic and pilot signal quality determination of finger lock status of rake receiver correlators

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San Diego, CA, United States of America

Jigneshkumar P Shah