Apple Inc.

Freescale Semiconductor,inc.

Nxp Usa, Inc.

Jayesh H Kotecha

Jayakrishnan Cheriyath Mundarath

Kaibin Huang

James Wesley McCoy

Leo G Dehner

Ning Chen

Ian C Wong

Oghenekome Oteri

Taeyoon Kim

Ian C Wang

Peter Zahariev Rashev

Raja Venkatesh Tamma

Hoojin Lee

A technique for operating a wireless communication device includes transmitting a scheduling request from the wireless communication device and receiving, following the scheduling request, an uplink grant that assigns an uplink channel to the wireless communication device. The uplink grant may include one or more fields indicating whether only channel quality information is to be transmitted or if data is also to be transmitted.

Techniques for reducing communication errors in a wireless communication system

A wireless communication system non-collaborative, multiple input, multiple output (MIMO) space division multiple access (SDMA) system determines subscriber station combining and weighting vectors that yield a high average signal-to-interference plus noise ratio (SINR). Each subscriber station independently transmits information to a base station that allows the base station to determine a weight vector wfor each subscriber station using the determined combining vector of the subscriber station. The icombining vector corresponds to a right singular vector corresponding to a maximum singular value of a channel matrix between a base station and the isubscriber station. Each subscriber station transmits signals using a weight vector, which corresponds to a left singular vector corresponding to a maximum singular value of a channel matrix between the isubscriber station and the base station. The base station uses the weight vector wto determine the signal transmitted by the isubscriber station.

Beamforming for non-collaborative, space division multiple access systems

A millimeter-wave wireless multiple antenna system () and method () are provided in which a UE () uses a multi-antenna subsystem () to identify a plurality of m strongest transmit beams () from the base station () based on power measurements of a plurality of synchronization signal blocks (SSBs) transmitted on a corresponding plurality of transmit beams by the base station (), and to generate a composite uplink random access channel (RACH) preamble () that is sent () to the base station () to identify the plurality of m strongest transmit beams and relative weights for each of the plurality of m strongest transmit beams which are used by the base station () to generate an optimal downlink transmit beam for use in sending a RACH response to the UE ().

Optimal beamforming in millimeter-wave cellular networks using a single composite random access preamble

Various methods of allocating uplink control channels in a communication system are implemented at a resource scheduler or a user equipment (UE). In one method the scheduler reserves resources for a downlink data channel and signals a corresponding downlink data channel grant and also reserves resources for a persistent uplink control channel for a longer duration than the data channel grant. Signaling overhead associated with a grant for this persistent uplink control channel is reduced over a full dynamic grant. A predetermined rule can be used at the scheduler and at the UE to avoid overhead signaling associated with a grant for this persistent control channel. Predetermined rules at the UE and scheduler can also be used to reserve appropriate resources and select appropriate MCS levels for control information and the control information and uplink data can be transported over a common uplink channel when a time overlap occurs between an uplink data channel and the persistent control channel.

Uplink control channel allocation in a communication system and communicating the allocation

A wireless multiple antenna system () uses a multi-antenna subsystem () to generate a composite sample waveform by continuously sweeping a plurality of receive beams (RX-RXM) during each SSB transmission in a plurality of transmit beams (TX-TX), generating a composite received signal strength metric value from a batch of samples collected over the plurality of receive beams to determine the presence of the SSB, and then jointly searching the composite sample waveform for an optimal receive beam and an SSB frequency of any detected SSB that are used by the UE () to perform a cell search which matches a transmit beam from the base station () to the optimal receive beam.

Fast and robust cell search for 5G and millimeter-wave wireless communication systems using joint frequency raster and receive beam search

A millimeter-wave wireless multiple antenna system () and method () are provided in which a UE () uses a multi-antenna subsystem () to identify a plurality of m strongest transmit beams () from the base station () based on power measurements of a plurality of synchronization signal blocks (SSBs) transmitted on a corresponding plurality of transmit beams by the base station (), and to generate multiple uplink random access channel (RACH) preambles () that is sent () to the base station () to identify the plurality of m strongest transmit beams and relative weights for each of the plurality of m strongest transmit beams which are used by the base station () to generate an optimal downlink transmit beam for use in sending a RACH response to the UE ().

Optimal beamforming in millimeter-wave cellular networks using multiple random access preambles

Embodiments of the disclosure provide a system and method for providing channel feedback information (CFI) from a user equipment device to a base station. CFI is transmitted from the user equipment device on first and second communication channels. The user equipment device is operable to measure the channel rank of a downlink channel and to select a preferred channel rank that is used to configure the CFI that is transmitted to the base station. The base station is operable to use the preferred channel rank to interpret the CFI transmitted by the user end device.

Channel rank updates in multiple-input multiple-output communication systems

In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.

MIMO precoding enabling spatial multiplexing, power allocation and adaptive modulation and coding

A mechanism is provided for detecting and decoding a primary broadcast channel transmitted by a base station at a user equipment device. Embodiments improve performance and robustness over prior methods for detecting and decoding by determining a channel differential metric for channel estimates derived based on each candidate demodulation reference symbol (DMRS) sequence and selecting a set of top DMRS sequence candidates using the associated channel differential metrics. From the set of top DMRS candidates, a best DMRS candidate, and consequently, the three least significant bits of the beam index, can be determined.

Efficient detection of primary broadcast channel in 5G-NR

A technique for operating a wireless communication device includes transmitting a scheduling request from the wireless communication device and receiving, following the scheduling request, an uplink grant that assigns an uplink channel to the wireless communication device. The uplink grant may include one or more fields indicating whether only channel quality information is to be transmitted and/or if data is to be transmitted.

A base station is configured to provides a beam change feedback channel for a user equipment to communicate unsolicited beam change feedback to the base station. If the user equipment determines that a beam other than the beam to which the user equipment is tuned has a stronger signal, the user equipment initiates a transmission on the beam change feedback channel to the base station indicating a beam change. The base station uses the feedback from the user equipment to update the beam to the user equipment.

Beam tracking in wireless communication

In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.

A system and method is disclosed for resource block-specific control signaling in a communication system. Communication data is transmitted using a transmission channel comprising a plurality of resource blocks defined by allocating time-frequency slots in a transmission resource. Resource block control information is transmitted in a 'feed-forward' manner to a user end (UE) or group of UEs using channels physically mapped into scheduled resource blocks (RBs) for that user or group of users. Embodiments of the invention provide an RB-specific control channel that comprises RB control elements that are embedded within scheduled resource blocks. The invention, therefore, reduces the amount of control information that must be transmitted by common or shared control channels.

Growing community of inventors

Austin, TX, United States of America

Jayesh H Kotecha