Per-Layer Transport Blocks for MIMO Layer Imbalance Mitigation

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Solution Overview

Problem

Layer imbalance in MIMO communication systems results in varying post-processing signal-to-noise-ratios (ppSNRs) across layers, leading to increased complexity, reduced user experience, and excessive retransmissions due to transmit-equalization-based waveforms.

Innovation Solution

Implementing per-MIMO-layer transport blocks (TBs) to carry pre-equalized waveforms, allowing for adaptive modulation and coding schemes, which reduces complexity and improves robustness against layer imbalance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If transmit-equalization-based waveforms are used, then spectral efficiency is improved, but layer imbalance occurs causing varying post-processing signal-to-noise-ratios across layers

Engineering Contradiction:

Improvespectral efficiencyVSAvoidlayer balance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the transport block into separate per-MIMO-layer transport blocks, allowing each layer to be independently encoded and modulated. This segmentation enables adaptive modulation and coding schemes for each layer, resolving the layer imbalance issue while maintaining spectral efficiency through optimized per-layer transmission parameters

Inventive Principle:

Principle #1Segmentation

2Reliability

If per-MIMO-layer transport blocks are implemented, then robustness against layer imbalance is improved, but device complexity increases

Engineering Contradiction:

Improverobustness against layer imbalanceVSAvoidmodem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the parameters of the transport block structure by introducing per-layer TBs with independent modulation and coding schemes. This parameter change enables robustness against layer imbalance while the benefits in reliability and spectral efficiency offset the increased device complexity

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If traditional transport block encoding is used, then ease of operation is maintained, but excessive retransmissions occur due to layer imbalance

Engineering Contradiction:

Improveencoding simplicityVSAvoidretransmission rate

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

By segmenting the transport block into per-MIMO-layer transport blocks, the patent enables independent encoding for each layer. This segmentation allows the system to maintain operational simplicity through standardized encoding processes while dramatically reducing retransmission rates by eliminating layer imbalance-related transmission failures

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260051930A1Layer-imbalance mitigation techniques for pre-equalized waveforms

Publication Date: 2026.02.19 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may generate a pre-equalized waveform associated with a multiple-input multiple-output (MIMO) communication system. The wireless communication device may transmit the pre-equalized waveform using a per-MIMO-layer transport block (TB). Numerous other aspects are described.