Msg3 PUSCH MCS Indication via Segmented Fields

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Solution Overview

Problem

The existing wireless communication systems face challenges in efficiently performing the random access procedure, particularly in configuring and indicating the repetition transmission of Message 3 (Msg 3) Physical Uplink Shared Channel (PUSCH) to support the increasing data traffic and device connectivity demands.

Innovation Solution

The proposed method involves a user equipment (UE) receiving information on a Modulation and Coding Scheme (MCS) index group for Msg3 PUSCH from a base station, based on configured repetition transmission. The UE then transmits Msg3 PUSCH using a specific MCS index value indicated by the base station, which is configured within the MCS field of the RAR UL grant.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of bits for MCS field is increased to indicate higher MCS values, then the MCS indication capability is improved, but the downlink control information overhead increases

Engineering Contradiction:

ImproveMCS indication capabilityVSAvoiddownlink control information overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The MCS field is segmented into two parts: a first field indicating a first MCS index value, and a second field indicating a second MCS index value. This segmentation allows the system to convey more MCS information without requiring a single large-bit field, thereby improving MCS indication capability while controlling downlink control information overhead.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of increasing the bit width of a single MCS field to indicate higher MCS values, the patent introduces a second dimension by adding another MCS field. This dimensional approach allows the system to indicate a broader range of MCS values through the combination of two fields rather than expanding a single field's capacity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If repetition transmission of Msg3 PUSCH is configured to support explosive data traffic, then the data transmission capacity is improved, but the resource consumption increases

Engineering Contradiction:

Improvedata transmission capacityVSAvoidresource consumption

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent applies dynamic MCS indication by allowing the base station to selectively configure different MCS index values through the two-field mechanism. This dynamic adaptation enables the system to optimize resource usage for repetition transmission of Msg3 PUSCH, adjusting the modulation and coding scheme according to channel conditions and traffic requirements, thereby improving data transmission capacity while controlling resource consumption.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250071816A1Method and device for performing random access in wireless communication system

Publication Date: 2025.02.27 LG ELECTRONICS INC

AI summary

Disclosed are a method and device for performing random access in a wireless communication system. The method for performing, by a terminal, a random access procedure in a wireless communication system, according to one embodiment of the present disclosure, may comprise the steps of: receiving, from a base station, information about a modulation and coding scheme (MCS) index group for a message 3 physical uplink shared channel (Msg3 PUSCH), on the basis that repetition transmission for the Msg3 PUSCH is configured, the MCS index group comprising at least one MCS index value; receiving, from the base station, MCS information indicating a specific MCS index value among the at least one MCS index value; and transmitting the Msg3 PUSCH on the basis of the specific MCS index value indicated by the MCS information.