RedCap SDT Bandwidth Part Configuration in RRC Idle Modes

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently supporting small data transmission (SDT) procedures for reduced capability (RedCap) user equipment (UE) due to insufficient configuration of downlink bandwidth parts and search space sets, particularly in radio resource control (RRC) inactive or idle modes.

Innovation Solution

Configuring a default initial downlink bandwidth part and control resource set (CORESET) to support SDT for both RedCap and non-RedCap UEs, enabling communication in RRC inactive or idle modes by transmitting and receiving necessary information to facilitate small data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate initial downlink bandwidth part is configured for RedCap UEs, then SDT capability is improved, but device complexity and resource allocation overhead increase

Engineering Contradiction:

ImproveSDT capabilityVSAvoidbandwidth part configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies universality by configuring a single default initial downlink bandwidth part that serves both RedCap and non-RedCap UEs. This shared bandwidth part configuration enables SDT for RedCap UEs without requiring separate dedicated configurations, thereby maintaining SDT capability while reducing device complexity and network configuration overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If RedCap UEs use existing non-RedCap initial downlink bandwidth part, then configuration complexity is reduced, but SDT performance deteriorates

Engineering Contradiction:

ImproveconfigurationVSAvoidSDT performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies parameter changes by modifying the default initial downlink bandwidth part configuration to include parameters suitable for RedCap UEs. Specifically, the bandwidth part is configured with appropriate bandwidth parameters, subcarrier spacing, and cyclic prefix lengths that optimize SDT performance for RedCap devices while maintaining compatibility with non-RedCap UEs.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If separate CORESET and search space sets are configured for RedCap SDT, then transmission reliability is improved, but resource allocation overhead increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidconfiguration overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies merging by combining the configuration of CORESET and search space sets into a unified configuration framework that serves both RedCap and non-RedCap UEs. This approach consolidates control resource allocation, reducing the total number of separate configurations needed while ensuring reliable SDT transmission for RedCap devices through appropriate resource allocation within the shared framework.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250358076A1Bandwidth part operations for small data transmission procedures of a reduced capability user equipment

Publication Date: 2025.11.20 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, information configuring a default initial downlink bandwidth part, wherein the default initial downlink bandwidth part includes downlink resources that support small data transmission (SDT) for reduced capability (RedCap) and non-RedCap UEs. The UE may receive, from the network node, information configuring a control resource set (CORESET) and one or more search space sets that support SDT for RedCap UEs. The UE may perform, while in a radio resource control (RRC) inactive or idle mode, an SDT based at least in part on the information configuring the default initial downlink bandwidth part and the information configuring the CORESET and the one or more search space sets. Numerous other aspects are described.