Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Chao-Cheng Su

Weidong Yang

Chia-Hao Yu

Jiann-Ching Guey

Tzu-Han Chou

Lung-Sheng Tsai

Ju-Ya Chen

Aimin Justin Sang

Chun-Hsuan Kuo

Ming-Po Chang

Bo-Si Chen

Chou Kuan Hung

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives an indication for transmitting a particular DMRS sequence in an uplink transmission. The particular DMRS sequence is time domain based. The UE generates the particular DMRS sequence. The UE modulates the particular DMRS sequence to obtain a set of symbols. The UE maps a plurality of symbols of the set of symbols to a plurality of subcarriers. The UE transmits the plurality of symbols on the plurality of subcarriers.

Low PAPR reference signal

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE measures one or more reference signals to determine a channel state on a channel including M delay taps. The UE determines a first precoder matrix for selecting a set of beams from L beams transmitted from the base station on the channel. The UE determines a second precoder matrix for combining the set of beams. The second precoder matrix includes at least two groups of coefficients each including coefficients being normalized based on a respective reference coefficient. Each coefficient corresponds to a respective one beam of the L beams at a particular polarization on a respective one delay tap of the M delay taps. The UE quantizes coefficients of the second precoder. The UE transmits an indication of the second precoder matrix having quantized coefficients.

Differential quantization of precoder matrix

Techniques and examples pertaining to enhanced Type II channel state information (CSI) in mobile communications are described. A user equipment (UE) receives, from a network node of a wireless network, one or more reference signals via a communication link between the UE and the network node. The UE constructs a precoder such that a number of selected beams for a plurality of delay taps is reduced. The UE also constructs a linear combination-based CSI feedback by utilizing the precoder such that overhead in the CSI feedback is reduced compared to a case in which the number of selected beams for the plurality of delay taps is not reduced. The UE then transmits the CSI feedback to the network node.

Enhanced type II channel state information in mobile communications

Various solutions with respect to codebook-based uplink transmission in wireless communications are described. A user equipment (UE) stores information with respect to a plurality of permutations with respect to a mapping between a plurality of sounding reference signal (SRS) resources and a plurality of antenna ports at the UE. The UE receives signaling from a network node of a wireless network. The signaling contains an index identifying a permutation among the plurality of permutations. The UE performs an uplink transmission of data to the network node using one or more SRS resources of the plurality of SRS resources and one or more antenna ports of the plurality of antenna ports according to the identified permutation.

Codebook-based uplink transmission in wireless communications

Various solutions with respect to codebook-based uplink transmission in wireless communications are described. A user equipment (UE) generates a codebook comprising a plurality of precoders. The UE processes information using the codebook and transmits the processed information to a network node of a wireless network. In generating the codebook, the UE selects a candidate precoder from a single-stage codebook or a dual-stage codebook and performs a permutation on the candidate precoder.

Various solutions with respect to codebook-based uplink transmission in wireless communications are described. A user equipment (UE) receives a first signal from a network node of a wireless network, with the first signal selecting one or more codewords or a codebook from a plurality of different codebooks within a master codebook as allowed precoders at transmission ranks. The UE also receives a second signal from the network node, with the second signal selecting a precoder among the allowed precoders for uplink (UL) transmission. The UE then processes data using the selected precoder and performs an UL transmission of the processed data to the network node.

Techniques, schemes and examples pertaining to sequence design for synchronization and device identification in mobile communication systems are described. A processor of an apparatus generates a set of root sequences and also generates a set of signature sequences from the set of root sequences. The processor then transmits a signal comprising one or more of the signature sequences to a receiving device via a wireless channel. Each signature sequence of the set of signature sequences identifies the apparatus.

Sequence design for synchronization and device identification in wireless communication systems

Aspects of the disclosure provide an apparatus that includes a baseband processing circuit and a transmitting circuit. The baseband processing circuit is configured to encode a reference signal based on a specific sequence to generate a digital stream. The specific sequence has non-zero values at selected positions, and the number of coincidences of non-zero value positions between the specific sequence and a shifted copy of the specific sequence is smaller than a threshold. The transmitting circuit is configured to transmit wireless signals in response to the digital stream.

Method and apparatus for synchronization

A beamforming system synchronization architecture is proposed to allow a receiving device to synchronize to a transmitting device in time, frequency, and spatial domain in the most challenging situation with very high pathloss. A periodically configured time-frequency resource blocks in which the transmitting device uses the same beamforming weights for its control beam transmission to the receiving device. A pilot signal for each of the control beams is transmitted in each of the periodically configured time-frequency resource blocks. Pilot symbols are inserted into pilot structures and repeated for L times in each pilot structure. The L repetitions can be implemented by one or more Inverse Fast Fourier Transfers (IFFTs) with corresponding one or more cyclic prefix (CP) lengths.

Synchronization in a beamforming system

A beamforming system synchronization architecture is proposed to allow a receiving device to synchronize to a transmitting device in time, frequency, and spatial domain in the most challenging situation with very high pathloss. A periodically configured time-frequency resource blocks in which the transmitting device uses the same beamforming weights for its control beam transmission to the receiving device. A pilot signal for each of the control beams is transmitted in each of the periodically configured time-frequency resource blocks. The same synchronization signal can be used for all stages of synchronization including initial coarse synchronization, device and beam identification, and channel estimation for data demodulation.

A beamforming system synchronization architecture is proposed to allow a receiving device to synchronize to a transmitting device in time, frequency, and spatial domain in the most challenging situation with very high pathloss. A detector at the receiving device detects the presence of control beams, synchronizes to the transmission and estimates the channel response by receiving pilot signals. The detector has low complexity when exploiting the structure of the pilot signals. The detector consists of three stages that break down the synchronization procedure into less complicated steps. The detector accurately estimates the parameters required for identifying the transmit device and performing subsequent data communication.

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Hsinchu, Taiwan

Chao-Cheng Su