SRS Resource Group Indication for Multi-Panel UL MIMO

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Solution Overview

Problem

In next-generation mobile wireless communication systems, efficient indication of SRS resources is challenging, particularly in multi-panel UEs and non-codebook based UL transmissions, leading to increased signaling overhead and potential misalignment in simultaneous SRS resource usage across different panels.

Innovation Solution

The method involves configuring UEs with multiple SRS resource groups, where resources within the same group cannot be simultaneously used, and using a controlled indication mechanism to select resources from different groups, reducing SRI signaling overhead and ensuring proper SRS transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple SRS resources are indicated without grouping constraints, then resource selection flexibility is improved, but signaling overhead increases and resource alignment reliability deteriorates

Engineering Contradiction:

Improveresource selection flexibilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent segments SRS resources into multiple groups (first group, second group, etc.) where each group contains specific SRS resources. This segmentation allows the network to indicate resources from different groups simultaneously while preventing selection of multiple resources from the same group, thus reducing signaling overhead and avoiding resource conflicts in multi-panel UEs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary indication mechanism that specifies which SRS resource groups should be used rather than directly indicating individual resources. This intermediary approach reduces the number of bits required for signaling while maintaining the ability to select multiple resources across different groups, resolving the contradiction between flexibility and overhead.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If SRS resources from the same group can be simultaneously used, then resource selection flexibility is improved, but resource alignment reliability deteriorates due to potential misalignment in multi-panel UEs

Engineering Contradiction:

Improveresource selection flexibilityVSAvoidresource alignment reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

By dividing SRS resources into distinct groups with the constraint that only one resource per group can be selected, the patent ensures proper alignment in multi-panel UEs. Each group can be associated with a specific panel, preventing simultaneous selection of resources that would cause misalignment while still allowing flexible selection across panels.

Inventive Principle:

Principle #1Segmentation

3Reliability

If grouping constraints are imposed on SRS resources, then resource alignment reliability is improved, but resource selection flexibility deteriorates

Engineering Contradiction:

Improveresource alignment reliabilityVSAvoidresource selection flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent segments resources into groups but allows indication of multiple groups simultaneously. This segmentation with multi-group indication maintains reliability within each group while preserving overall flexibility across groups, resolving the contradiction between reliability and flexibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent adds a group dimension to resource selection. Instead of selecting individual resources in one dimension, the system selects resources across multiple group dimensions, where each group can be independently indicated. This dimensional approach maintains flexibility while ensuring proper alignment through group constraints.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12549306B2Efficient SRS resource indication methods

Publication Date: 2026.02.10 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method of transmitting an uplink transmission by a wireless device is disclosed. The method comprises a wireless device receiving signaling configuring the wireless device with a plurality of Sounding Reference Signal (SRS) resources. The wireless device subsequently receives an indication, in a physical layer downlink control channel, of a selected plurality of SRS resources selected from among the plurality of configured SRS resources and transmits a plurality of multiple-input multiple-output (MIMO) layers of a PUSCH transmission. The selected plurality of SRS resources map to respective ones of the plurality of MIMO layers and the indication of the selected plurality of SRS resources includes SRS resource indexes with a fixed order that corresponds to an order in which the SRS resources of the selected plurality of SRS resources are mapped to the MIMO layers.