PSFCH Resource Selection for MU-MIMO Sidelink Feedback

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Solution Overview

Problem

In multi-user multiple input-multiple output (MIMO) sidelink communication systems, there is a challenge in selecting unique physical sidelink feedback channel (PSFCH) resources for different sidelink transmissions sharing the same physical sidelink shared channel (PSSCH) resource, leading to potential signaling collisions and interference.

Innovation Solution

Implementing a PSFCH resource selection procedure based on parameters such as source ID, destination ID, demodulation reference signal (DMRS) port or pattern, orthogonal cover code (OCC) index, or signaled offset to facilitate unique PSFCH resource selection for each sidelink transmission, even when they share the same PSSCH resource, by indicating an MU-unicast mode that supports this selection process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple sidelink transmissions share the same PSSCH resource in MU-MIMO mode, then resource utilization and system capacity are improved, but signaling collisions and interference on PSFCH resources occur

Engineering Contradiction:

Improvesystem capacityVSAvoidfeedback transmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the PSFCH resource selection by introducing MU-unicast mode-specific resource mapping rules. Different sidelink transmissions in MU-MIMO mode are assigned to different PSFCH resources through segmentation based on transmission parameters, preventing collisions while maintaining high resource utilization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making PSFCH resource selection dependent on local transmission characteristics such as source ID, destination ID, and DMRS port. Each transmission gets a customized PSFCH resource based on its specific parameters, ensuring unique resource allocation without affecting other transmissions.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If PSFCH resources are selected based on PSSCH resources, then resource allocation is simplified, but unique PSFCH resources cannot be ensured for multiple transmissions on the same PSSCH resource

Engineering Contradiction:

Improveresource allocation simplicityVSAvoidPSFCH resource uniqueness

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent transitions from one-dimensional PSFCH resource selection (based only on PSSCH resource) to multi-dimensional selection by incorporating additional parameters such as source ID, destination ID, and DMRS port. This dimensional expansion ensures unique PSFCH resource allocation while maintaining systematic resource management.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent changes the selection parameters for PSFCH resources from simple PSSCH-based indexing to a composite parameter set including source ID, destination ID, DMRS port, and OCC index. This parameter transformation enables precise resource differentiation while preserving allocation efficiency.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If traditional PSFCH resource selection is used for MU-MIMO transmissions, then resource allocation follows existing procedures, but signaling collisions occur between feedback from different receiving UEs

Engineering Contradiction:

Improvecompatibility with existing proceduresVSAvoidsignaling collision

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces MU-unicast mode as an intermediary layer between traditional PSFCH resource selection and MU-MIMO transmissions. This intermediary mode provides specialized resource mapping rules that mediate between multiple transmitting UEs, preventing feedback collisions while maintaining compatibility with existing resource allocation frameworks.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11991671B2Feedback designs for multi-user multiple input-multiple output sidelink communication

Publication Date: 2024.05.21 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. In some systems, a first user equipment (UE) may operate in accordance with a multi-user (MU) multiple input-multiple output (MIMO) communication mode and may communicate with multiple other UEs over a same physical sidelink shared channel (PSSCH) resource. In some implementations, the first UE may transmit an indication of an MU-unicast mode for multiple sidelink transmissions to the multiple other UEs and may transmit the multiple sidelink transmissions to the multiple other UEs over the same PSSCH resource. In such implementations, the multiple other UEs may select physical sidelink feedback channel (PSFCH) resources to transmit feedback associated with the multiple sidelink transmissions in accordance with a PSFCH resource selection procedure associated with the MU-unicast mode. In accordance with the PSFCH resource selection procedure, the multiple other UEs may each select different PSFCH resources for their respective feedback transmissions.