RACH Resource Mapping for RedCap UE Type Identification

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Solution Overview

Problem

Current methods fail to identify the type of RedCap UE during initial access, as the 3GPP discusses defining two types of RedCap UEs with different capabilities, necessitating a solution to differentiate between them based on RO resources.

Innovation Solution

Introduce a proportion parameter in RACH configuration to allocate RO resources for different RedCap UE types, allowing identification through Msg1 transmission based on specific RO usage patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If different RO resources are allocated for different RedCap UE types, then RedCap UE type identification is enabled, but signaling overhead and system complexity increase

Engineering Contradiction:

ImproveRedCap UE type identification accuracyVSAvoidRACH configuration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by allocating different RO resources specifically to different RedCap UE types (first-type and second-type) while leaving non-RedCap UEs to use default RO resources. This targeted differentiation enables accurate RedCap UE type identification without requiring complete reconfiguration of the RACH system for all UE types, thus resolving the contradiction between identification accuracy and system complexity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the RO resources into distinct groups for different RedCap UE types. By dividing the available RO resources and assigning specific segments to first-type RedCap UEs and second-type RedCap UEs respectively, the system enables type identification through resource selection while maintaining manageable configuration complexity through structured segmentation.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If proportion parameter is introduced for RO resource allocation, then RedCap UE type differentiation is achieved, but RACH configuration overhead increases

Engineering Contradiction:

ImproveRedCap UE type adaptabilityVSAvoidSignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent introduces a proportion parameter to dynamically control the allocation of RO resources between different RedCap UE types. By changing this parameter, the system can adapt to different deployment scenarios and traffic conditions, enabling flexible RedCap UE type differentiation. The parameter is efficiently signaled to UEs, minimizing the information overhead while maintaining high adaptability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12490285B2Method and apparatus for identifying reduced capability user equipment type, base station, and user equipment

Publication Date: 2025.12.02 SPREADTRUM COMMUNICATION (SHANGHAI) CO LTD

AI summary

A method and an apparatus for identifying a reduced capability (RedCap) user equipment (UE) type, a base station, and a UE. The method includes broadcasting random access channel (RACH) configuration information, comprising a proportion parameter of available RACH occasion (RO) resources for different RedCap UE types, of RedCap UEs in a cell through a broadcast message in such a manner that a RedCap UE of the RedCap UEs is configured to transmit, based on the proportion parameter and a RedCap UE type of the different RedCap UE types, Msg1 to a base station by using RO resources corresponding to the RedCap UE type; and identifying the RedCap UE type of the RedCap UE based on the RO resources used by the RedCap UE to transmit the Msg1.