Single Beam Uplink Precoding Optimization for 5G Latency Reduction

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Solution Overview

Problem

Current 5G NR and other wireless communication systems face inefficiencies in non-codebook based uplink precoding procedures, particularly due to the need for multiple beam measurements and scheduling requests, which increase latency and signaling overhead.

Innovation Solution

A method where a user equipment (UE) measures a non-zero-power channel state information reference signal (NZP-CSI-RS) to determine a single optimal beam for communication with a base station, allowing direct transmission of a physical uplink shared channel (PUSCH) without sending additional scheduling requests, thereby reducing the precoding timeline and signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple beam measurements and scheduling requests are performed in non-codebook based uplink precoding, then beam selection accuracy is improved, but latency and signaling overhead increase

Engineering Contradiction:

Improvebeam selection accuracyVSAvoidlatency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent extracts and eliminates unnecessary scheduling request signaling steps from the traditional non-codebook based uplink precoding procedure. By determining a single beam based on NZP-CSI-RS measurements and directly transmitting PUSCH without additional scheduling requests, the method removes redundant signaling overhead and reduces latency while maintaining beam selection accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies the skipping principle by rushing through the precoding timeline - the UE determines a single beam from NZP-CSI-RS measurements and immediately transmits PUSCH on that beam, skipping the traditional multi-step scheduling request and grant exchange process. This accelerates the uplink transmission process while preserving measurement-based beam selection accuracy.

Inventive Principle:

Principle #21Skipping (Rushing through)

2Measurement precision

If multiple beam measurements and scheduling requests are performed in non-codebook based uplink precoding, then beam selection accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvebeam selection accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If traditional non-codebook based uplink precoding procedure is used, then beam selection flexibility is maintained, but precoding timeline and resource utilization efficiency worsen

Engineering Contradiction:

Improvebeam selection flexibilityVSAvoidresource utilization efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent inverts the traditional approach by having the UE determine a single beam based on NZP-CSI-RS measurements and directly transmit PUSCH, rather than following the conventional multi-step process with scheduling requests. This inversion maintains beam selection flexibility through measurement-based determination while significantly improving resource utilization efficiency by eliminating redundant signaling steps and reducing the precoding timeline.

Inventive Principle:

Principle #13The other way round (Inversion)

4Loss of time

If single beam determination from NZP-CSI-RS measurement is used, then precoding timeline is reduced, but beam selection options are limited

Engineering Contradiction:

Improveprecoding timelineVSAvoidbeam selection options

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by having the UE perform NZP-CSI-RS measurements and determine the optimal single beam in advance before PUSCH transmission. This preliminary beam determination based on channel state measurements enables direct PUSCH transmission without additional scheduling requests, reducing the precoding timeline while maintaining adaptability through measurement-guided beam selection.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11751186B2Single layer uplink non-codebook based precoding optimization

Publication Date: 2023.09.05 QUALCOMM INC

AI summary

A configuration to reduce a timeline for non-codebook based uplink precoding procedures. The apparatus measures an NZP-CSI-RS over one or more beams from a base station. The apparatus determines a single beam for communication with the base station based on measurement of the NZP-CSI-RS. The apparatus transmits a PUSCH using the single beam and based on determining the single beam for communication with the base station. The apparatus may receive a configuration from the base station to perform a SRS-less non-codebook based uplink precoding procedure. The UE may transmit the PUSCH using the single beam and without transmitting an SRS further based on the configuration from the base station. The apparatus may skip transmission of an SRS between measurement of the NZP-CSI-RS and transmission of the PUSCH.