Msg4 PDSCH TBS Scaling for RedCap UE Decoding Reliability

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Solution Overview

Problem

Existing wireless communication technologies, particularly in NR and LTE, face challenges in enhancing reliability and reducing complexity for UEs with limited capabilities, such as RedCap UEs, during random access channel procedures.

Innovation Solution

The method involves indicating transport block size (TBS) scaling and/or repetition for the physical downlink shared channel (PDSCH) transmission, tailored for UEs with limited capabilities, by determining appropriate transmission parameters to achieve a reduced coding rate, thereby improving message decoding reliability and reducing decoding complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard TBS and coding rate are used for Msg4 PDSCH, then communication speed is maintained, but decoding reliability deteriorates for UEs with limited capabilities

Engineering Contradiction:

Improvemessage decoding reliabilityVSAvoidcommunication speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the TBS and coding rate parameters dynamically based on UE capability indicators. For RedCap UEs, the network entity receives an indication of limited capability and adjusts the TBS scaling factor and coding rate accordingly, transforming the fixed parameters into adaptive ones that optimize both reliability and speed for different UE types

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adjustment of transmission parameters through a feedback mechanism where the UE indicates its capability and the network entity responds by selecting appropriate TBS scaling and coding rate values. This creates a dynamic system that adapts to different UE capabilities rather than using static parameters

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If standard coding rate is used for PDSCH, then transmission efficiency is maintained, but decoding complexity increases for UEs with limited capabilities

Engineering Contradiction:

Improvedecoding complexityVSAvoidtransmission efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent modifies the coding rate parameter based on UE capability indications. For RedCap UEs with limited processing power, the network entity selects a lower coding rate that reduces decoding complexity while maintaining acceptable transmission efficiency, effectively adapting the parameter to the UE's operational constraints

Inventive Principle:

Principle #35Parameter changes

3Reliability

If TBS scaling is applied for RedCap UEs, then coverage enhancement is achieved, but transmission time increases

Engineering Contradiction:

Improvecoverage enhancementVSAvoidtransmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies TBS scaling by adjusting the transport block size parameter based on UE capability and coverage requirements. The network entity calculates an appropriate scaling factor that enhances coverage for RedCap UEs while minimizing the increase in transmission time, optimizing the trade-off between reliability and latency

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12526838B2Indication of TBS scaling and repetition for MSG4 PDSCH

Publication Date: 2026.01.13 QUALCOMM INC

AI summary

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques and mechanisms for indicating transport block size (TBS) scaling and/or repetition for a Msg4 physical downlink shared channel (PDSCH).