Configured-Grant PUSCH SRS Resource Selection From Recent SRS

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Solution Overview

Problem

In wireless communication systems, UEs face challenges in determining appropriate SRS resources for PUSCH transmissions when configured grants are used, as they lack clear guidance on which SRS resources to utilize after receiving a configured grant, leading to inefficiencies in uplink scheduling.

Innovation Solution

The UE identifies the most recent SRS transmission prior to PUSCH communications corresponding to a configured grant and uses the associated SRS resources for transmission, ensuring accurate resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If configured grant is used for PUSCH transmission, then uplink scheduling flexibility is improved, but SRS resource determination becomes unclear and complex

Engineering Contradiction:

Improveuplink scheduling flexibilityVSAvoidSRS resource determination complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The base station pre-configures multiple SRS resource sets and their associations with configured grants before actual PUSCH transmission. The UE stores these pre-established mappings, allowing it to automatically determine the correct SRS resources when a configured grant is received, without needing complex real-time determination logic.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE autonomously determines which SRS resource set to use by checking its own stored configurations and identifying the first SRS resource set associated with the received configured grant. This self-service mechanism eliminates the need for additional base station signaling or complex coordination, simplifying the overall system while maintaining flexibility.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If multiple SRS resource sets are configured, then SRS resource determination accuracy is improved, but signaling overhead increases

Engineering Contradiction:

ImproveSRS resource determination accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The base station sends downlink control information (DCI) in advance that indicates which SRS resource set should be used for upcoming PUSCH transmissions. The UE stores this indication and uses it when transmitting PUSCH, ensuring accurate SRS resource selection while avoiding the need for repeated signaling during actual transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of transmitting full SRS resource set configurations repeatedly, the base station transmits compact DCI indicators that reference pre-configured SRS resource sets. The UE maintains local copies of these resource set definitions and uses the DCI indicators to select the appropriate copy, significantly reducing signaling overhead while maintaining full functionality.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS12532311B2Sounding reference signal resource determination for physical uplink shared channel with configured grant

Publication Date: 2026.01.20 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a first sounding reference signal (SRS) transmission that occurred most recently in time, relative to a second SRS transmission, prior to transmission of one or more physical uplink shared channel (PUSCH) communications. The one or more PUSCH communications may correspond to a configured grant. The UE may transmit the one or more PUSCH communications using one or more SRS resources associated with the first SRS transmission. Numerous other aspects are provided.