LCID-Based Uplink Messaging for NTN Coverage and RedCap Indication

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Solution Overview

Problem

In non-terrestrial networks (NTN), the uplink coverage problem in physical uplink control channel (PUCCH) transmission for hybrid automatic repeat request (HARQ) feedback of message 4 (Msg4) arises, and existing mechanisms for coverage enhancement consume additional transmission resources, complicating the indication of RedCap UE identification and coverage enhancement simultaneously.

Innovation Solution

A method for transmitting an uplink message using a logic channel identifier (LCID) to indicate either RedCap UE or coverage enhancement, determining the LCID based on dedicated PRACH resource configuration or priority information, enabling separate identification and network reception to avoid redundant indication and optimize transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If coverage enhancement mechanism is introduced for Msg4 PUCCH transmission, then uplink coverage is improved, but additional transmission resources are consumed

Engineering Contradiction:

Improveuplink coverageVSAvoidtransmission resources

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies preliminary action by having the terminal indicate coverage enhancement capability in Msg3 before the actual Msg4 transmission occurs. This allows the network to prepare and allocate appropriate resources in advance for the coverage enhancement mechanism, avoiding last-minute resource constraints while ensuring reliable uplink coverage when needed.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If additional indication information is added to Msg3 to indicate coverage enhancement, then RedCap UE identification and coverage enhancement indication are achieved, but message structure complexity increases

Engineering Contradiction:

ImproveUE type indication capabilityVSAvoidmessage structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing the Msg3 indication mechanism to serve multiple functions: it simultaneously indicates both RedCap UE identification and coverage enhancement capability. This multi-functional approach eliminates the need for separate indication fields, thereby avoiding message structure complexity while maintaining versatile UE type indication capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250374333A1Method for transmitting uplink message, terminal and network device

Publication Date: 2025.12.04 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided is a method for transmitting an uplink message. The method is performed by a terminal. The method includes: transmitting a first message, wherein an uplink logic channel identifier (LCID) used by the first message indicates a reduced capability (RedCap) user equipment (UE) or a coverage enhancement, and the first message is a message 3 in a four-step random access procedure or a message A in a two-step random access procedure.