Transmitted precoding matrix indicator (TPMI) determination for new radio (NR) frequency range 1 (FRI) single user (SU) multiple input multiple output (MIMO) in an uplink
AssigneeRakuten Symphony, Inc.
InventorsDuc To, Vihang Kamble, Raghavendra Madanahally Ramakrishna, Ronak Bharatkumar Lalwala
Life of this patent
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Abstract
A precoder index is derived from a precoder codebook using a low computationally complex process. A plurality of uplink channel matrix estimates are received at a Base Station (BS) from a User Equipment (UE). The plurality of uplink channel matrix estimates are processed to determine an indicator of the precoder having a highest spectral efficiency estimate. The indicator of the precoder having the highest spectral efficiency estimate is selected for transmission by the BS.
Claims20
A method for deriving a precoder index from a precoder codebook, comprising:
- receiving, at a Base Station (BS), a plurality of uplink channel matrix estimates from a User Equipment (UE);
- processing the plurality of uplink channel matrix estimates to determine spectral efficiency estimates corresponding to precoders in a codebook, wherein the spectral efficiency estimates are based on estimates of post-equalized Signal to Interference & Noise Ratios (SINRs) that are converted to the spectral efficiency estimates corresponding to multi-layer precoders in the codebook;
- and
- selecting, for a next transmission by the UE, an indicator of multi-layer precoders having a highest spectral efficiency estimate.
A Base Station (BS), configured to:
- receive a plurality of uplink channel matrix estimates from a User Equipment (UE);
- process the plurality of uplink channel matrix estimates to determine spectral efficiency estimates corresponding to precoders in a codebook, wherein the spectral efficiency estimates are based on estimates of post-equalized Signal to Interference & Noise Ratios (SINRs) that are converted to the spectral efficiency estimates corresponding to multi-layer precoders in the codebook;
- and
- select, for a next transmission, an indicator of multi-layer precoders having a highest spectral efficiency estimate.
A non-transitory computer-readable media having computer-readable instructions stored thereon, which when executed by a processor causes the processor to perform operations comprising:
- receiving, at a Base Station (BS), a plurality of uplink channel matrix estimates from a User Equipment (UE);
- processing the plurality of uplink channel matrix estimates to determine spectral efficiency estimates corresponding to precoders in a codebook, wherein the spectral efficiency estimates are based on estimates of post-equalized Signal to Interference & Noise Ratios (SINRs) that are converted to the spectral efficiency estimates corresponding to multi-layer precoders in the codebook;
- and
- selecting, for a next transmission by the UE, an indicator of multi-layer precoders having a highest spectral efficiency estimate.
Dependencies are inferred from the claim text.