PUSCH Beam Management for Dynamic UL Mode Switching

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Solution Overview

Problem

In scenarios with both TRPs and RPs, efficiently operating UL beam management for beam correspondence capable UEs is challenging, as DL-based UL beam management is not feasible for RPs due to the absence of DL RS, and existing solutions require RRC reconfiguration for switching between codebook-based and non-codebook-based UL operations.

Innovation Solution

A dynamic switching mechanism between codebook-based and non-codebook-based UL transmission is proposed, using DCI-based indicators to select the operation mode without additional DCI fields, and configuring a mixed SRS resource set to enable efficient transmission to both TRPs and RPs, with reduced SRS transmission and interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If DL-based UL beam management is used for TRPs, then UL transmission efficiency is improved, but it cannot be applied to RPs due to absence of DL RS

Engineering Contradiction:

ImproveUL transmission efficiencyVSAvoidapplicability to different reception points

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the beam management approach by identifying different reception point types (TRPs with DL RS and RPs without DL RS) and applying appropriate beam management methods to each segment. This allows DL-based UL beam management to be applied to TRPs while alternative methods are used for RPs, resolving the contradiction between efficiency and adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by tailoring the beam management approach to the specific characteristics of each reception point. TRPs receive DL-based UL beam management due to their DL RS capability, while RPs receive SRS-based beam management, optimizing performance for each local context rather than using a uniform approach.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If RRC reconfiguration is used to switch between codebook-based and non-codebook-based UL operations, then operation mode switching is achieved, but system complexity and signaling overhead increase

Engineering Contradiction:

Improveoperation mode switching capabilityVSAvoidRRC reconfiguration overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic switching between codebook-based and non-codebook-based UL operations through DCI signaling rather than static RRC reconfiguration. This allows the system to adapt operation modes dynamically based on current transmission needs, reducing signaling overhead while maintaining flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces DCI signaling as an intermediary mechanism to enable operation mode switching without requiring full RRC reconfiguration. This intermediary approach allows for lighter-weight, more efficient mode transitions while maintaining the adaptability benefits of configurable operation modes.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If separate SRS resource sets are configured for codebook-based and non-codebook-based operations, then operation-specific beam management is enabled, but UL resource overhead and configuration complexity increase

Engineering Contradiction:

Improvebeam management accuracyVSAvoidSRS resource overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies universality by designing an SRS resource set structure that can serve multiple functions and operation modes. The same SRS resource set can be used for both codebook-based and non-codebook-based operations, reducing overall resource overhead while maintaining the precision needed for different beam management scenarios through appropriate resource selection and configuration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12500644B2Beam management for physical uplink shared channels in dense deployments

Publication Date: 2025.12.16 IPLA HLDG INC

AI summary

A user equipment (UE) in a wireless network may receive Downlink Control Information (DCI) that schedules Physical Uplink Shared Channel (PUSCH) for non-codebook-based and/or codebook-based PUSCH operation. The UE may be configured with a Sounding Reference Signal (SRS) resource set for each codebook-based operation and non-code-book-based operation. The UE may transmit using a codebook base operation in a first set of PUSCH occasions and transmit using a non-code-book-based operation in a second set of PUSCH occasions. The DCI may include multiple SRS Resource Indicator (SRI) fields pertaining to different sets of PUSCH occasions. Similarly, DCI may include information pertaining to a number of layers for precoding for a set of PUSCH occasions.